Aquarium breach · minimax-m3

Create a large glass aquarium whose side panel develops a visible crack and then bursts. The simulation must include: - Water escaping through the opening with flow strength based on water depth and decreasing as the tank drains - A curved water jet affected by gravity - A spreading puddle that collides with the room boundaries - Fish, rocks, plants, and a floating toy reacting differently according to density, buoyancy, drag, and current - Objects transitioning correctly from underwater motion to airborne motion and then to floor collisions - Fish attempting to swim against the current before being swept through the breach - Glass fragments with angular velocity, collisions, and water resistance - A visible waterline that lowers continuously rather than disappearing all at once Let the user drag the crack vertically before triggering the failure. A lower crack should initially produce a stronger jet than a higher crack. Give me 1 html file

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transcript · 37 messages

user

assistant

thinking

Let me create a comprehensive aquarium simulation. This is going to be a complex HTML file with:

1. A glass aquarium with water
2. A crack that the user can drag
3. Physics simulation for water, glass shards, fish, plants, rocks, and a toy
4. A spreading puddle
5. Realistic water dynamics with depth-based flow

Let me plan the physics:
- Water particles that flow out based on hydrostatic pressure (depth-dependent)
- Each particle has position, velocity, affected by gravity
- Glass shards: have angular velocity, bounce off floor
- Fish: try to swim against current, but get swept
- Plants: flexible, sway with current
- Rocks: dense, fall fast, mostly stay
- Toy: floats, bobs on surface
- Puddle: accumulates on floor, spreads based on volume

For rendering, I'll use HTML5 Canvas with:
- A room background (wooden floor, walls)
- The aquarium
- Water with a visible waterline
- All objects rendered in proper order

Let me code this up. I'll use a particle-based water system - around 300-500 particles for good performance.

Physics approach:
- Water is represented as a fluid height in the tank
- Plus particles that escape through the crack
- The crack emits particles at velocity based on sqrt(2*g*h) where h is water depth above crack
- Particles experience gravity
- When particles hit the floor, they become puddle particles that spread
- Glass shards fly outward with random angles

For the puddle: I'll track a 2D height field on the floor that spreads based on a diffusion equation, and the puddle boundary is determined by where height > threshold.

Let me write this all up. I'll aim for a really polished single HTML file.

Key components:

```
- Room: floor at y=floor_y, walls at x=0 and x=room_w
- Aquarium: rectangle from (ax, ay) to (ax+aw, ay+ah)
- Glass: drawn as thick translucent rectangles
- Water: from water_y to ay+ah, with waterline
- Crack: vertical line on right side, draggable
- Objects: fish, plants, rocks, toy inside tank
- Particles: water droplets ejected from crack
- Glass shards: broken pieces with physics
- Puddle: 2D grid on floor
```

Let me code this now. I need to be careful with performance - using simple particle physics should be fine.

For the puddle, I'll use a 2D height field with simple diffusion and flow. Each cell spreads to neighbors based on height difference.

For fish, I'll give them a swim force and let the current push them. The current inside the tank is strongest near the crack, so they get pushed there.

For plants, I'll model them as chain of segments (verlet) attached to substrate.

For the toy, it'll be a simple object that bobs.

Let me start writing the file. I'll make it around 800-1000 lines of well-organized code.

Actually let me think more carefully about the water simulation. The water inside the tank needs to look like it has a surface. The simplest approach:
- Draw a rectangle of water (with alpha) for the tank interior
- Track a "water level" that decreases as water escapes
- When the water level passes the crack height, water flows out

For particles flowing out:
- Spawn rate proportional to pressure = water_depth_above_crack
- Initial velocity: horizontal, magnitude = sqrt(2*g*h) (Torricelli's law)
- Particles get gravity, then become puddle on floor

For the puddle:
- 2D grid, each cell has height
- Each frame, water from particles adds to nearest cell
- Spreading: flow from cell to neighbors based on height difference
- Draw as filled regions with surface gradient

Let me get coding. I'll use a simpler puddle model: track particles in a 2D space, and they spread naturally. But that might be expensive. A height field is better.

Actually, I'll do a hybrid: use a coarse 2D height field for the puddle (e.g., 100x50 cells), with simple water flow between neighbors. This is the shallow water equations in their simplest form.

Let me start writing the code now.

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Aquarium Catastrophe</title>
<style>
  body { margin: 0; background: #2a1f1a; overflow: hidden; font-family: 'Georgia', serif; color: #e8d4b0; }
  canvas { display: block; }
  #ui {
    position: fixed; top: 10px; left: 10px;
    background: rgba(20,15,10,0.85);
    border: 1px solid #6a4a30;
    padding: 10px 14px;
    border-radius: 4px;
    font-size: 13px;
    line-height: 1.5;
    max-width: 280px;
  }
  button {
    background: #6a3030; color: #f0e0c0; border: 1px solid #8a4040;
    padding: 6px 12px; cursor: pointer; font-family: inherit; font-size: 13px;
    border-radius: 3px;
  }
  button:hover { background: #8a4040; }
  #status { font-style: italic; opacity: 0.8; margin-top: 6px; }
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div id="ui">
  <strong>Aquarium Failure Simulator</strong><br>
  Drag the crack on the right side of the tank to set its position.<br>
  <span id="status">Click "Trigger Failure" when ready.</span><br>
  <button id="triggerBtn">Trigger Failure</button>
  <button id="resetBtn">Reset</button>
</div>
<script>
// ... main code
</script>
</body>
</html>
```

Now the main code. Let me think about all the systems:

```js
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
let W, H;
function resize() { W = canvas.width = window.innerWidth; H = canvas.height = window.innerHeight; }
resize();
window.addEventListener('resize', resize);

// Room dimensions
const ROOM = {
  wallLeft: 0,
  wallRight: 0,  // set in init
  floor: 0,      // set in init
  ceiling: 0
};

// Aquarium
const tank = {
  x: 0, y: 0, w: 0, h: 0,
  glassThickness: 8,
  crackX: 0, crackY: 0,  // crack position (vertical line on right side)
  crackLength: 30,
  cracked: false,
  failed: false
};

let waterLevel = 0;  // y-coordinate of water surface
let waterVolume = 0; // total water "mass"
const initialWaterLevel = 0;
```

Hmm, let me think about a different approach. I'll use a "water column" inside the tank - the water has a top surface (waterline) and a height. As water escapes, waterLevel drops.

For the jet through the crack:
- Pressure at crack depth d below waterline is proportional to d
- Velocity of ejected water: v = sqrt(2*g*d) where d = waterLevel - crackY
- Direction: horizontal (outward from the crack on the right side)
- Spread: small random angle

For the puddle:
- Grid of cells, each has height
- Water from jet particles adds to puddle
- Spreading: simple diffusion with outflow

For glass shards:
- 10-20 shards
- Each has position, velocity, angular velocity, vertices
- Bounce off floor, walls
- Slow down due to water resistance (if in water)

For objects:
- Fish: have density ~1 (neutral), swim force, current affects them
- Rocks: density > water, sink to bottom, mostly stationary
- Plants: buoyant, flexible (verlet chain)
- Toy: density < water, floats at surface, bobs

Let me code this:

```js
// State
let state = 'intact';  // intact, failing, failed
let particles = [];
let shards = [];
let fishes = [];
let plants = [];
let rocks = [];
let toys = [];
let puddle = null;  // 2D height field

// Init
function init() {
  // Set up room
  ROOM.wallRight = W;
  ROOM.floor = H - 60;
  
  // Set up tank
  const tankW = Math.min(500, W * 0.45);
  const tankH = Math.min(380, H * 0.55);
  tank.x = (W - tankW) / 2 - tankW * 0.15;
  tank.y = H - tankH - 60;
  tank.w = tankW;
  tank.h = tankH;
  
  // Crack default - middle right side
  tank.crackX = tank.x + tank.w;
  tank.crackY = tank.y + tank.h * 0.65;
  tank.crackLength = 40;
  tank.cracked = false;
  tank.failed = false;
  
  // Water
  waterLevel = tank.y + 20;  // near top
  
  // Create objects
  createObjects();
  
  // Create puddle grid
  puddle = createPuddleGrid();
  
  // Clear particles
  particles = [];
  shards = [];
  
  state = 'intact';
}
```

OK let me just write the whole thing. I'll be detailed.

Actually I realize I need to think about the rendering order carefully:
1. Background (room walls, floor, decoration)
2. Back of tank (back glass)
3. Inside tank: water, objects, back glass effects
4. Glass shards that fly out
5. Jet particles
6. Puddle
7. Front glass (with reflection)
8. Cracks

Hmm, but if water is leaking, the puddle is on the floor in front of the tank. The jet is going to the right. So:

1. Background
2. Room floor
3. Back of tank
4. Water and objects inside
5. Front glass
6. Puddle (in front of tank, on floor)
7. Jet particles
8. Glass shards

But the puddle extends to the right past the tank. The jet is going right and down. So jet should be in front of the tank's right side. OK.

Let me think about what's "in the room" vs "in the tank":
- Tank is sitting on the floor
- Room has floor that extends beyond tank
- Puddle is on the floor, in front of and to the right of the tank
- Jet comes from right side of tank, going right and down
- Jet hits floor, becomes puddle
- Glass shards fly out and to the right, fall to floor

For depth:
- Tank front face is closer to viewer
- Tank back face is farther
- We render: back wall, floor, tank back face, water, objects, tank front face (with transparency)
- But since 2D, the water jet from right side needs to be in front of the right glass panel

Let me simplify: render the tank in 2D. The "back" of the tank is just a darker color. The "water" is a translucent blue rectangle. The "front glass" is mostly invisible except for highlights. The right side has a vertical glass edge.

Actually, for clarity, let me make it a side-view simulation. The aquarium is shown from the front (we see through the front glass). The crack is on the right side panel. Wait, but if we see the front, we can't see the side panel. 

Let me re-read the prompt: "A large glass aquarium whose side panel develops a visible crack and then bursts."

So it's a side panel. The viewer sees the front of the aquarium. The side panel would be... hmm.

Actually, in an aquarium, the side panels are the left and right walls when viewed from the front. The front panel is the one facing us. The side panels are visible if we look at an angle, but in a straight-on view we only see the front panel.

But the user wants to drag the crack on the side panel. So maybe the viewer is at an angle, or we render the right side panel visible somehow.

Let me make it so the aquarium is shown at a slight 3/4 view, where we can see the front and the right side. The crack is on the right side panel. The water comes out of the right side.

For simplicity in 2D, I'll render it as:
- Aquarium front: large rectangle facing us
- Aquarium right side: narrow parallelogram on the right showing perspective
- Crack: on the right side
- Water jet: comes out of the right side, going to the right
- This is a common aquarium art style

Yes, let me do that. The right side is rendered as a parallelogram, giving 3D feel.

Or simpler: just render the right side as a slightly darker vertical strip, with the crack on it.

Actually let me make it even simpler. The aquarium is shown front-on. The "side panel" is the rightmost vertical glass panel. The crack is on this panel. When it bursts, water shoots out to the right. This works fine in 2D.

For the puddle: it spreads to the right of the tank and in front of it (we see the floor).

OK let me just code it. Final plan:

```
Layout (2D side view):
- Background: dark room
- Floor: wooden floor at bottom
- Walls: left and right walls of room
- Tank: large glass rectangle, with frame
- Tank front glass (faint, mostly transparent)
- Water inside tank (blue with gradient)
- Objects inside tank
- Right side of tank has the crack
- When failed: water jet from crack, going right and down
- Glass shards fly out
- Puddle on floor
```

Let me also add some room decorations like a window or shelf to make it look like a room.

Now let me write the actual code:

```javascript
// === Constants ===
const GRAVITY = 900;  // px/s^2
const WATER_DENSITY = 1.0;

// === State ===
let state = 'intact';
let waterLevel, waterSurfaceY;  // top of water
const TANK = {};
const ROOM = {};

// === Objects ===
let fishes = [], plants = [], rocks = [], toys = [], particles = [], shards = [];

// === Puddle (2D height field) ===
let puddleGrid = null;
const PUDDLE_CELL_SIZE = 12;

function init() {
  // Room
  ROOM.floorY = H - 80;
  ROOM.leftWallX = 40;
  ROOM.rightWallX = W - 40;
  
  // Tank
  const tankW = 480;
  const tankH = 380;
  TANK.x = W * 0.25;
  TANK.y = H - tankH - 80;
  TANK.w = tankW;
  TANK.h = tankH;
  TANK.glassT = 10;
  TANK.frameT = 6;
  
  // Crack (on right side of tank, vertical line)
  TANK.crackTop = TANK.y + TANK.h * 0.55;  // upper end of crack
  TANK.crackBot = TANK.crackTop + 50;  // lower end
  TANK.cracked = false;
  TANK.failed = false;
  
  // Water
  TANK.waterTopY = TANK.y + 15;  // water surface near top
  
  // Init objects
  fishes = createFishes(5);
  plants = createPlants(3);
  rocks = createRocks(8);
  toys = createToys(1);
  
  // Init puddle grid
  initPuddle();
  
  particles = [];
  shards = [];
  state = 'intact';
}
```

OK I'm going to just write the whole file now. Let me be thorough.

For the water jet, I need to compute the flow rate. The flow rate through an opening at depth d is:
Q = A * sqrt(2 * g * d) * Cd

where A is opening area, Cd is discharge coefficient (~0.6), d is depth from water surface to opening.

For my simulation, I'll spawn N particles per second, where N is proportional to d^0.5.

Each particle:
- Spawned at random point along crack
- Initial velocity: horizontal to the right, magnitude = sqrt(2*g*d) * Cd
- Affected by gravity
- Has a small random spread angle
- When it hits the floor, it becomes a puddle drop (added to puddle grid cell)

For the puddle, I'll use a simple shallow water model on a grid:
- Each cell has height h
- Each timestep:
  - Add new water to cells where particles landed
  - Flow between neighboring cells: dh/dt = k * (h_self - h_neighbor) * dt
  - Outflow from edges (drains off the edge of the room)

Actually, let me use even simpler puddle: just track particles. When they hit the floor, they bounce/spread and form the puddle. The puddle is the collection of "settled" particles. To make it look like water, I can render the puddle particles as filled circles with low alpha, and the surface is approximated by the topmost particles in each region.

Hmm, but with many particles this could be expensive. Let me try the height field approach.

For 100x80 grid = 8000 cells, updating each cell per frame is OK.

Let me write the code now. I'll commit to the design.

Actually, simpler approach for the puddle: just render settled particles as a 2D region. Track puddle "mass" at each (x, y) location and use that to determine the puddle's coverage. The puddle spreads by some random walk + flow downhill.

OK let me just use a grid:

```js
const PUDDLE_W = Math.ceil(W / PUDDLE_CELL_SIZE);
const PUDDLE_H = Math.ceil(80 / PUDDLE_CELL_SIZE);  // puddle depth up to 80px
let puddle = new Float32Array(PUDDLE_W * PUDDLE_H);

function puddleIdx(x, y) { 
  const cx = Math.floor(x / PUDDLE_CELL_SIZE);
  const cy = Math.floor(y / PUDDLE_CELL_SIZE);
  if (cx < 0 || cx >= PUDDLE_W || cy < 0 || cy >= PUDDLE_H) return -1;
  return cy * PUDDLE_W + cx;
}

function addToPuddle(x, y, amount) {
  const idx = puddleIdx(x, y);
  if (idx >= 0) puddle[idx] += amount;
}

function updatePuddle(dt) {
  const newPuddle = new Float32Array(puddle.length);
  const flowRate = 5;  // m/s
  for (let y = 0; y < PUDDLE_H; y++) {
    for (let x = 0; x < PUDDLE_W; x++) {
      const idx = y * PUDDLE_W + x;
      const h = puddle[idx];
      if (h < 0.01) continue;
      
      // Flow to neighbors (lower)
      let totalOut = 0;
      const neighbors = [
        [x+1, y], [x-1, y], [x, y+1], [x, y-1]
      ];
      const heights = neighbors.map(([nx, ny]) => {
        if (nx < 0 || nx >= PUDDLE_W || ny < 0 || ny >= PUDDLE_H) return -1;
        return puddle[ny * PUDDLE_W + nx];
      });
      
      // For each neighbor with lower height, flow proportional to difference
      // ... (compute flow)
    }
  }
}
```

Actually, a simpler approach: shallow water. h_new[i,j] = h[i,j] + sum of (h[i,j] - h[nx,ny]) * factor for each neighbor.

Let me think about this differently. For the visual effect, I just need:
- Water hits the floor and accumulates
- The accumulated water spreads
- The puddle has a visible surface
- It eventually drains off the right wall (or stays)

I'll do a cellular automaton:
- Each cell has water height h
- For each step, water flows from each cell to lower neighbors
- The flow rate is proportional to height difference
- The puddle boundary is where h > threshold

For rendering, I'll draw the puddle as filled polygons for each connected region of cells above threshold.

Or, I'll just use a marching-squares-like approach: find the contour of the puddle.

Hmm, this is getting complex. Let me simplify: I'll use a 1D puddle depth model along the x-axis. The puddle has a "thickness" that varies with x. As more water is added, the puddle extends further to the right.

```js
// Puddle profile: array of heights along x
const PUDDLE_RES = 8;
let puddleHeights = new Float32Array(Math.ceil(W / PUDDLE_RES));

function updatePuddle(dt) {
  // Add evaporation/drainage
  // Spread to neighbors
  for (let i = 0; i < puddleHeights.length; i++) {
    if (puddleHeights[i] < 0.01) continue;
    // Spread left/right
    const left = puddleHeights[i-1] || 0;
    const right = puddleHeights[i+1] || 0;
    let flow = 0;
    if (left < puddleHeights[i]) {
      const f = Math.min(0.5, (puddleHeights[i] - left) * 0.3) * dt;
      puddleHeights[i] -= f;
      puddleHeights[i-1] += f;
    }
    if (right < puddleHeights[i]) {
      const f = Math.min(0.5, (puddleHeights[i] - right) * 0.3) * dt;
      puddleHeights[i] -= f;
      puddleHeights[i+1] += f;
    }
  }
}
```

For the 2D puddle spread, I can add another dimension. But let me start with 1D and see if it looks good.

Actually, for the visual effect of water spreading on a floor, I think 1D is enough. The puddle looks like a triangular/wedge shape extending from the tank.

Hmm, but in 2D the puddle should also spread toward/away from the viewer. We don't really see that in side view, but we see it in plan view. Since we're in side view, we just see the silhouette.

But we can render the puddle with perspective: closer parts of the puddle appear larger/further forward. Actually no, side view doesn't show that. The puddle in side view is just a flat shape on the floor.

OK let me just do 1D puddle. The puddle is a 2D region in plan view, but in our side view we see its profile. The profile is what the user sees as the puddle's shape.

Wait, that's not quite right either. In side view, we see a 2D cross-section of the room. The floor is a horizontal line. The puddle sits on the floor. The puddle's height (perpendicular to floor) is what we see. As the puddle spreads away from the camera, it gets foreshortened. But for simplicity, we just see a "blob" of water sitting on the floor with some height.

Actually I think a reasonable approach: model the puddle as a 2D region in screen space. As water lands, it adds to the puddle. The puddle is rendered as a filled region with surface highlight.

Let me do this: keep a 2D height field (puddle[x][y] where x is horizontal, y is depth from tank), and render the puddle as a 3D-like shape in side view.

Or, I'll just use a 2D grid and render the puddle as a top-down view but viewed from the side. So the puddle is rendered as if we're looking down at it, but we're actually looking from the side. The "puddle depth" is rendered as a thin film on the floor.

OK, I think the cleanest approach is:

1. Puddle is a 2D height field in screen space (above the floor).
2. Each cell has a height.
3. The puddle surface is at floor + puddle_height for each cell.
4. Render the puddle as a 2D region above the floor.

Wait, but in side view, a puddle on the floor is just a thin layer. The user sees a horizontal "puddle" on the floor. The shape of this layer is what we care about.

In side view:
- Floor at y=floorY
- Puddle is a region from y=floorY to y=floorY+depth, where depth varies with x
- The puddle spreads in the x direction (across the floor)

Actually, the puddle can also spread in the y direction (front-to-back from viewer), but in side view we don't see that, so let's just model 1D.

Wait no - actually in side view, the puddle can be in front of OR behind the tank. We see the puddle in front (between us and the tank) extending to the right. We don't see the puddle behind the tank.

Hmm, but realistically, water spilling on the floor would spread in all directions, but if there's a wall, it'd pool against the wall.

Let me think about the user's view. They're looking at the aquarium from the front. The floor extends below the aquarium. The right wall of the room is at the right edge of the screen. Water spills out of the right side of the tank, lands on the floor to the right of the tank, and spreads.

In side view, we see the floor as a horizontal line. The puddle on the floor appears as a thin layer on this line. The puddle extends from the tank's right edge to wherever the water has reached.

So the puddle profile is 1D: height(x) for x from tank's right edge to wherever the water has spread.

OK let me do that. Actually, I realized I want the puddle to also spread slightly downward (toward the front of the room), but in side view we don't see that. So 1D is fine.

Now, let me also think about how the water flows inside the tank. When the crack opens, water flows out, creating a current inside the tank toward the crack. This current sweeps the fish, plants, and toy toward the crack.

The current inside the tank has a horizontal velocity component that increases near the crack. The current strength is proportional to the water flow rate.

For each object inside the tank, I'll compute the current velocity at its position:
- vx = some_base_flow * exp(-distance_to_crack / scale)

Or I'll just use a simple model: vx = flow_rate * (1 - x / tank_width). Closer to crack = faster current.

Actually, a more physical model: the water velocity at any point is inversely proportional to the cross-sectional area at that x. As water flows from left to right, the cross-section narrows (because the water surface is tilted). But that's complex. Let me just use a simple decay function.

OK enough planning, let me code.

I'll structure the code as:
1. Setup
2. Helper functions
3. Object creation
4. Update functions (for each subsystem)
5. Render functions
6. Main loop

Let me write the full HTML now. I want this to be a really polished simulation.

One more consideration: the user can drag the crack vertically before triggering. So I need mouse handling for dragging the crack. The crack has a top and bottom y. The user can drag the entire crack up/down.

Actually, "drag the crack vertically" - so the user drags the crack (as a single entity) up and down. The crack is a vertical line. The user can grab it and move it up or down.

OK let me start writing the code.

Let me think about the size of things. With a 500x380 tank, I have plenty of room. I'll go with:
- Tank: 500x400
- Room floor: at H-100
- Tank sits on the floor with some clearance (it's on a stand?)

Actually, I'll put the tank directly on the floor for simplicity. The bottom of the tank is at the floor level.

Hmm, but in real aquariums, they're on a stand. For visual interest, let me put it on a wooden cabinet.

Let me also add some room details:
- A window on the left
- Wall color
- Maybe a picture frame
- Carpet/wood floor

OK, let me write the code now. I've been planning too long.

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Aquarium Catastrophe</title>
<style>
  body { margin: 0; background: #1a1410; overflow: hidden; font-family: 'Georgia', serif; color: #d4b890; user-select: none; }
  canvas { display: block; cursor: default; }
  canvas.dragging { cursor: ns-resize; }
  #ui { position: fixed; top: 12px; left: 12px; background: rgba(20,15,10,0.9); border: 1px solid #6a4a30; padding: 12px 16px; border-radius: 4px; font-size: 13px; line-height: 1.6; max-width: 300px; box-shadow: 0 4px 20px rgba(0,0,0,0.5); }
  #ui h1 { margin: 0 0 8px 0; font-size: 16px; font-weight: normal; color: #f0d4a0; letter-spacing: 1px; }
  button { background: #5a2828; color: #f0d8a0; border: 1px solid #8a4848; padding: 7px 14px; cursor: pointer; font-family: inherit; font-size: 13px; border-radius: 3px; margin-right: 6px; margin-top: 6px; transition: background 0.2s; }
  button:hover { background: #7a3838; }
  button:disabled { opacity: 0.4; cursor: not-allowed; }
  #status { font-style: italic; opacity: 0.85; margin-top: 8px; min-height: 18px; }
  .info { font-size: 12px; opacity: 0.7; margin-top: 4px; }
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div id="ui">
  <h1>✦ Aquarium Catastrophe ✦</h1>
  <span>Drag the crack on the right wall of the tank to position it, then trigger the failure.</span>
  <div id="status">Awaiting breach...</div>
  <div>
    <button id="triggerBtn">⚡ Trigger Failure</button>
    <button id="resetBtn">↻ Reset</button>
  </div>
  <div class="info">Lower cracks produce stronger jets due to higher water pressure.</div>
</div>
<script>
'use strict';

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
const statusEl = document.getElementById('status');
const triggerBtn = document.getElementById('triggerBtn');
const resetBtn = document.getElementById('resetBtn');

let W, H, dpr;
function resize() {
  dpr = window.devicePixelRatio || 1;
  W = window.innerWidth;
  H = window.innerHeight;
  canvas.width = W * dpr;
  canvas.height = H * dpr;
  canvas.style.width = W + 'px';
  canvas.style.height = H + 'px';
  ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
}
resize();
window.addEventListener('resize', () => { resize(); init(); });

// === Globals ===
const GRAVITY = 1100;
const WATER_DRAG = 0.4;
const FLOOR_Y = () => H - 90;

const TANK = {
  x: 0, y: 0, w: 0, h: 0,
  glassT: 12,
  frameT: 8,
  crackTop: 0, crackBot: 0,
  cracked: false,
  failed: false,
  shake: 0,
  shakeTime: 0
};

let waterTopY = 0;  // y of water surface
let waterVel = 0;   // current rate of water level change
let state = 'intact';  // intact, failing, settled
let lastTime = 0;
let draggingCrack = false;

// Objects
let fishes = [], plants = [], rocks = [], toys = [], particles = [], shards = [];
let ambientBubbles = [];

// Puddle: 1D array of heights along x
const PUDDLE_RES = 6;
let puddleH = null;  // Float32Array
let puddleStartX = 0, puddleEndX = 0;

function init() {
  // Tank dimensions
  const tankW = Math.min(560, W * 0.5);
  const tankH = Math.min(420, H * 0.6);
  TANK.w = tankW;
  TANK.h = tankH;
  TANK.x = W * 0.5 - tankW * 0.45;
  TANK.y = FLOOR_Y() - tankH;
  TANK.crackTop = TANK.y + TANK.h * 0.55;
  TANK.crackBot = TANK.crackTop + 55;
  TANK.cracked = false;
  TANK.failed = false;
  TANK.shake = 0;
  TANK.shakeTime = 0;
  
  waterTopY = TANK.y + 18;
  
  // Create objects
  fishes = createFishes(5);
  plants = createPlants(3);
  rocks = createRocks(7);
  toys = createToys(1);
  
  // Reset puddle
  const n = Math.ceil(W / PUDDLE_RES) + 1;
  puddleH = new Float32Array(n);
  puddleStartX = TANK.x + TANK.w;
  puddleEndX = TANK.x + TANK.w;
  
  particles = [];
  shards = [];
  ambientBubbles = [];
  for (let i = 0; i < 30; i++) ambientBubbles.push(createBubble());
  
  state = 'intact';
  statusEl.textContent = 'Drag the crack to set its height, then trigger failure.';
  triggerBtn.disabled = false;
}

// === Object Creation ===
function createFishes(n) {
  const arr = [];
  for (let i = 0; i < n; i++) {
    arr.push({
      x: TANK.x + 60 + Math.random() * (TANK.w - 120),
      y: waterTopY + 50 + Math.random() * (TANK.h - 100),
      vx: 30 + Math.random() * 30,
      vy: 0,
      size: 14 + Math.random() * 8,
      hue: 20 + Math.random() * 40,  // orange to yellow
      tailPhase: Math.random() * Math.PI * 2,
      swimDir: 1,
      alive: true,
      panic: 0
    });
  }
  return arr;
}

function createPlants(n) {
  const arr = [];
  for (let i = 0; i < n; i++) {
    const baseX = TANK.x + 50 + (TANK.w - 100) * (i + 0.5) / n;
    const height = 80 + Math.random() * 80;
    const segs = 8;
    const segs_arr = [];
    for (let j = 0; j <= segs; j++) {
      segs_arr.push({
        x: baseX,
        y: TANK.y + TANK.h - j * (height / segs),
        ox: baseX,  // original x
        oy: TANK.y + TANK.h - j * (height / segs)
      });
    }
    arr.push({
      segs: segs_arr,
      hue: 80 + Math.random() * 40,
      width: 6 + Math.random() * 4
    });
  }
  return arr;
}

function createRocks(n) {
  const arr = [];
  for (let i = 0; i < n; i++) {
    const size = 18 + Math.random() * 22;
    arr.push({
      x: TANK.x + 40 + Math.random() * (TANK.w - 80),
      y: TANK.y + TANK.h - size/2,
      size: size,
      vx: 0, vy: 0,
      color: `hsl(${20 + Math.random()*20}, ${10 + Math.random()*15}%, ${25 + Math.random()*15}%)`,
      shape: Math.random() * Math.PI * 2,
      spin: 0
    });
  }
  return arr;
}

function createToys(n) {
  const arr = [];
  arr.push({
    x: TANK.x + TANK.w * 0.4,
    y: waterTopY - 5,
    vx: 0, vy: 0,
    size: 18,
    type: 'duck',
    bobPhase: 0
  });
  return arr;
}

function createBubble() {
  return {
    x: TANK.x + 20 + Math.random() * (TANK.w - 40),
    y: TANK.y + TANK.h - 10 - Math.random() * (TANK.h - 30),
    size: 1 + Math.random() * 3,
    speed: 8 + Math.random() * 12
  };
}

// === Input handling ===
canvas.addEventListener('mousemove', e => {
  const mx = e.clientX, my = e.clientY;
  if (draggingCrack) {
    const cy = Math.max(TANK.y + 30, Math.min(TANK.y + TANK.h - 30, my));
    const len = TANK.crackBot - TANK.crackTop;
    TANK.crackTop = cy;
    TANK.crackBot = cy + len;
  } else {
    // Check hover over crack
    const hovering = mx > TANK.x + TANK.w - 25 && mx < TANK.x + TANK.w + 5 &&
                     my > TANK.crackTop && my < TANK.crackBot;
    canvas.classList.toggle('dragging', hovering);
  }
});

canvas.addEventListener('mousedown', e => {
  const mx = e.clientX, my = e.clientY;
  if (mx > TANK.x + TANK.w - 25 && mx < TANK.x + TANK.w + 5 &&
      my > TANK.crackTop && my < TANK.crackBot && state === 'intact') {
    draggingCrack = true;
  }
});

canvas.addEventListener('mouseup', () => { draggingCrack = false; });
canvas.addEventListener('mouseleave', () => { draggingCrack = false; });

// Touch support
canvas.addEventListener('touchstart', e => {
  const t = e.touches[0];
  canvas.dispatchEvent(new MouseEvent('mousedown', { clientX: t.clientX, clientY: t.clientY }));
});
canvas.addEventListener('touchmove', e => {
  const t = e.touches[0];
  canvas.dispatchEvent(new MouseEvent('mousemove', { clientX: t.clientX, clientY: t.clientY }));
  e.preventDefault();
}, { passive: false });
canvas.addEventListener('touchend', () => canvas.dispatchEvent(new MouseEvent('mouseup')));

triggerBtn.addEventListener('click', () => {
  if (state === 'intact') {
    TANK.cracked = true;
    TANK.failed = true;
    state = 'failing';
    triggerBtn.disabled = true;
    statusEl.textContent = 'Structural failure!';
    spawnShards();
  }
});

resetBtn.addEventListener('click', init);

function spawnShards() {
  const n = 14;
  for (let i = 0; i < n; i++) {
    const t = i / n;
    const y = TANK.crackTop + t * (TANK.crackBot - TANK.crackTop);
    shards.push({
      x: TANK.x + TANK.w + 2,
      y: y,
      vx: 100 + Math.random() * 250,
      vy: -100 - Math.random() * 250,
      angle: (Math.random() - 0.5) * 0.6,
      angVel: (Math.random() - 0.5) * 8,
      size: 8 + Math.random() * 14,
      width: 4 + Math.random() * 6,
      height: 8 + Math.random() * 18,
      wet: true
    });
  }
}

// === Particle system ===
function spawnWaterParticle() {
  if (waterTopY >= TANK.crackTop) return;  // water level above crack
  const depth = waterTopY - TANK.crackTop;  // hmm, this is negative. need |depth|
  // Actually, depth = (waterTopY) - (crackTop). waterTopY is less than crackTop if water is below crack
  // Wait, y increases downward. waterTopY is the y of the water surface.
  // crackTop is the y of the top of the crack. Lower y = higher up.
  // If waterTopY < crackTop, water is above crack top, so water is leaking.
  // depth = crackTop - waterTopY (positive when water is above crack)
  // But Torricelli: v = sqrt(2*g*h) where h is depth from surface to hole.
  
  // Hmm wait, I have the math confused. Let me re-check.
  // In screen coords, y increases downward.
  // waterTopY is the y-coordinate of the water surface (small y = top).
  // TANK.crackTop is the y of the top of the crack.
  // TANK.crackBot is the y of the bottom of the crack.
  // 
  // If waterTopY < TANK.crackTop, water surface is above the top of the crack.
  // If waterTopY > TANK.crackBot, water surface is below the bottom of the crack (water has drained past).
  // In between, water is at the crack level.
  //
  // Depth at top of crack: d_top = TANK.crackTop - waterTopY (positive when water is above crack top)
  // Depth at bottom of crack: d_bot = TANK.crackBot - waterTopY
  //
  // For a particle ejected from a random point on the crack:
  // - Pick random y in [max(TANK.crackTop, waterTopY), TANK.crackBot] (water can leak from anywhere)
  // - Wait, water can only leak if waterTopY < TANK.crackBot
  // - If waterTopY < TANK.crackTop, the whole crack is submerged
  // - If waterTopY > TANK.crackTop, only the part of the crack below waterTopY leaks
  //
  // For now, let me just say: if waterTopY < TANK.crackBot, water leaks.
  
  // ... let me restructure
}

// OK let me restart the particle logic, more carefully
```

Let me think more carefully. I'll define the y-axis to increase downward (screen coords). waterTopY is the y of the top of the water column. Lower waterTopY = higher water level. As water drains, waterTopY increases.

Initial waterTopY = TANK.y + 18 (water near top of tank).

Crack: vertical line from TANK.crackTop to TANK.crackBot, both in screen coords.

For water to flow through the crack, waterTopY must be < TANK.crackBot. The flow rate is determined by the depth from water surface to the average crack position.

Actually, the flow rate through a small opening at depth d below the surface is Q = A * sqrt(2*g*d). For a vertical opening of length L, the flow varies along its length. But for simplicity, I'll use the average depth.

Let me define:
- crackMid = (TANK.crackTop + TANK.crackBot) / 2
- depth = crackMid - waterTopY (positive when crack is below water surface)
- If depth > 0, water flows.

Spawn rate per frame: flowRate * depth^0.5, where flowRate is a tunable constant.

For each spawned particle:
- y: random in [max(TANK.crackTop, waterTopY), TANK.crackBot]
- local depth at this y: y - waterTopY  (no wait, y is below waterTopY when y > waterTopY. so local depth = y - waterTopY in screen coords? Let me think.
- Actually, in screen coords, waterTopY is small (top of water). y > waterTopY means below the surface. The depth of the particle below the surface is y - waterTopY.
- Local pressure-driven velocity: v = sqrt(2*g*(y - waterTopY)) * Cd
- Direction: horizontal to the right, with small random spread

Let me write the spawn function:

```js
function spawnJetParticles(dt) {
  if (waterTopY >= TANK.crackBot) return;  // water has drained below crack
  if (!TANK.failed) return;
  
  const crackMid = (TANK.crackTop + TANK.crackBot) / 2;
  const depth = crackMid - waterTopY;  // positive when crack below water
  if (depth <= 0) return;
  
  // Flow rate (proportional to sqrt(depth))
  const baseRate = 0.5;
  const rate = baseRate * Math.sqrt(depth / 50) * (TANK.crackBot - TANK.crackTop) * dt;
  
  // ... this needs to be probability-based for individual particles
}
```

Hmm, the flow rate should give us a number of particles to spawn per frame. Let me just do:
```
particlesPerFrame = baseRate * sqrt(depth) * (crackLength / 30)
```

For depth = 100, this gives ~5 particles per frame at 60fps = 300 particles per second. That's a lot of particles, but they have short lifetimes so the total in flight is manageable.

Let me use a continuous emission model. Each frame, emit particles based on depth, with their initial velocity determined by local depth.

```js
function updateJet(dt) {
  if (!TANK.failed) return;
  if (waterTopY >= TANK.crackBot) return;
  
  const crackLen = TANK.crackBot - TANK.crackTop;
  const waterAboveTop = waterTopY < TANK.crackTop;  // is water above the top of the crack?
  
  // Number of particles to emit this frame
  const crackMid = (TANK.crackTop + TANK.crackBot) / 2;
  const depth = Math.max(0, crackMid - waterTopY);
  const emitCount = Math.floor(60 * Math.sqrt(depth / 100) * crackLen / 30 * dt);
  // ...
}
```

OK let me just code it more directly. Let me restructure.

Actually, looking at the prompt again:
- "Water escaping through the opening with flow strength based on water depth and decreasing as the tank drains"
- "A curved water jet affected by gravity"
- "A spreading puddle that collides with the room boundaries"

So the jet is curved (parabolic under gravity), and the puddle spreads and hits room walls.

Let me code this up now. I'll just write the full HTML file and iterate.

Let me think about the puddle spread. The puddle is on the floor. The floor is at y = FLOOR_Y(). The tank sits on the floor, so the tank's bottom is at FLOOR_Y(). The right side of the tank is at TANK.x + TANK.w.

The puddle starts at the base of the crack on the floor, which is roughly at (TANK.x + TANK.w, FLOOR_Y()). Water from the jet lands on the floor to the right of the tank. The puddle spreads to the right.

For 1D puddle model: puddleH[i] is the height of the puddle at x = puddleStartX + i * PUDDLE_RES. When a particle lands at (px, py), it adds to puddleH[closest index] and increases total water.

Spreading: simple diffusion between neighbors.

For "puddle collides with room boundaries": the right wall of the room is at W. The puddle spreads until it hits the right wall.

Let me also add a "puddle depth" cap and visual rendering.

OK, time to write the actual file. I've planned enough.

Let me write the file now. I'll aim for ~1000 lines of well-organized JavaScript.

Hmm one more thing - for the "water inside the tank" visualization. The water has a visible waterline. As water drains, the waterline lowers. Inside the tank, we see the water with objects.

For the inside-tank water, I'll draw it as a translucent blue rectangle from waterTopY to TANK.y + TANK.h, with some animation/gradient.

For the waterline, I can add a slight meniscus effect or a highlight.

For the tank itself:
- Glass walls (left, right, bottom) - thick lines
- Top frame (often an aquarium has a top frame)
- Background (back wall of tank - might be a poster or just dark)

For the stand/cabinet: I'll add a wooden cabinet under the tank.

OK let me write the file.

I think I should structure the code to have separate functions for each subsystem:
- init()
- updateTank(dt)
- updateFishes(dt)
- updatePlants(dt)
- updateRocks(dt)
- updateToys(dt)
- updateParticles(dt)
- updateShards(dt)
- updatePuddle(dt)
- updateWater(dt)  // water level dynamics
- renderRoom()
- renderTank()
- renderWater()
- renderObjects()
- renderJet()
- renderPuddle()
- renderShards()
- mainLoop()

And helper functions for spawning, etc.

Let me write it.

Actually, before I commit to writing, let me think about the visual style. I want this to look really nice, not just functional.

Style:
- Dark room with warm tones
- Wooden floor (warm brown)
- Wooden cabinet under tank
- Tank with subtle glass reflections
- Water with gradient (lighter at top, darker at bottom)
- Bubbles inside the water
- Plant leaves with gradient
- Fish with details (eye, tail, body)
- Toy as a yellow rubber duck
- Glass shards with refraction
- Water jet with translucency
- Puddle with reflective surface

Color palette:
- Background wall: #2a1f15 (dark brown)
- Floor: #4a3525 to #5a4530 (wood)
- Cabinet: #3a2818
- Tank glass: rgba(150,200,210,0.15)
- Water: #2a5070 to #1a3050 gradient
- Water surface: #5a90b0 highlight
- Sand at bottom: #c4a87a
- Plants: #2a5a3a to #4a7a4a
- Fish: orange/red, with black eye
- Toy duck: yellow #e8c850
- Glass shards: light blue, transparent
- Puddle: dark blue, reflective

I'll use these colors. Let me write the code.

For the "drag crack vertically" - the user can click on the crack and drag it. I'll add a hit zone around the crack.

Actually, let me make the crack draggable by clicking anywhere on the right side of the tank. The user clicks and drags, and the crack follows their y position.

I think I have enough planning. Let me write the file now.

Actually, one issue with the rendering: when the tank cracks and water is leaking, the right side of the tank should have a visible opening where water escapes. I'll render this as a gap in the right glass panel.

The crack itself should be visible (a dark line) on the right glass panel before failure. When the user clicks "Trigger Failure", the crack widens, glass shards fly out, and water starts flowing.

For the trigger:
- The crack was already visible (user dragged it)
- On trigger, glass shards fly out, water starts flowing
- The right glass panel has a "hole" where the crack was
- The water jet emerges from this hole

OK, writing the file now.

Let me think about one more thing: the order of operations for objects leaving the tank.

When the tank is draining, the water level drops. Objects in the water:
- Fish: swim around, but get swept by current. Eventually they reach the crack and get sucked out.
- Plants: rooted to the substrate, sway with current. They might bend toward the crack but stay rooted.
- Rocks: on the bottom, mostly stationary but might get pushed by strong current.
- Toy: floats on surface, follows the water level down. Eventually it reaches the crack level and gets pushed out.

When an object reaches the crack:
- If it's at the water surface near the crack: it gets pushed through the crack
- If it's underwater near the crack: it gets sucked toward the crack and then through

For the toy: it floats. As water drops, it drops with the water. When the water level is at the crack height, the toy is at the crack. The current pushes the toy through.

For the fish: they swim. When the current is strong, they can't resist and get pushed toward the crack. They go through the crack and fly out with the water.

For plants: they're rooted (attached to bottom). They sway but don't move.

For rocks: they're heavy. They might not move much, but the strong current near the crack could push them slightly. They probably stay on the bottom.

So the "transitioning from underwater to airborne" applies mainly to fish and the toy.

Implementation:
- Each object has position, velocity
- Forces: gravity, buoyancy, drag, current
- Current velocity: depends on object's position in tank. Strong near crack.
- When object is at the crack (right edge of tank, between crackTop and crackBot), it's "ejected" if it's near the water surface or if it's small enough.

Hmm, let me simplify: when waterTopY drops below the crack level, and an object is at the right side of the tank near the crack, the object transitions to "ejected" mode. In ejected mode, gravity takes over, the object flies out, and it eventually lands on the floor.

Actually, the prompt says "Objects transitioning correctly from underwater motion to airborne motion and then to floor collisions". So objects do transition. Let me implement this.

State for each object:
- 'in_water': object is inside the tank, subject to water forces
- 'ejected': object has been pushed through the crack, subject to air forces (mainly gravity)
- 'on_floor': object has landed and is at rest

For the toy: as water level drops, the toy follows the water surface. When the water surface is at the crack level, the toy is at the crack. The current then pushes it out. It flies out and lands on the floor (or in the puddle).

For fish: they're more complex. They swim, but the current can overpower them. The current gets stronger as more water flows out. Eventually, a fish near the right side gets pushed through the crack.

Let me implement this:
- Each fish has a swimForce (its ability to swim against current)
- Current velocity at fish's position: depends on x distance from crack
- If current > swimForce, fish is swept along
- Fish gets ejected when it's near the crack and at certain conditions

For plants: they're stationary (rooted). They have segments that can sway. The current pushes on the segments. As water drains, the lower segments become exposed to air (no water resistance), but the plant stays rooted.

Hmm, this is getting complex. Let me simplify:

Fish:
- Position, velocity
- Swim: applies force in random direction (wander)
- Current force: based on x position. v_current = flow * (1 - x_normalized)^2 where x_normalized is from 0 (left) to 1 (right)
- When the fish is close to the crack and the water level is below the fish, the fish gets ejected.
- Ejection: fish flies out with the current velocity, becomes airborne.

Toy:
- Floats on water surface (y = waterTopY - toy.size/2)
- If waterTopY < TANK.crackTop and toy is in the crack zone (x > TANK.x + TANK.w - 30), the toy gets pushed out.
- Ejection: toy flies out, lands somewhere.

Plants:
- Chain of segments, attached at bottom
- Each segment has water resistance (drag)
- Current pushes segments
- Plants are not "ejected" - they stay rooted

Rocks:
- Stationary on bottom
- Strong current near the crack might move them slightly
- They roll toward the crack and fall out when water is very low? Or stay in place.
- For simplicity, rocks stay in place (they're heavy and embedded in substrate).

Let me code this.

OK, writing the file now. For real this time.

Let me also think about how to make the simulation feel "right":
- The jet should arc gracefully
- The puddle should spread realistically
- The fish should look like they're struggling
- The crack should look menacing
- The whole thing should feel like a disaster unfolding

Visual touches:
- Add bubbles in the water
- Add slight wobble to the water surface
- Add wobble to the tank before failure (subtle)
- Add splash effect when water hits the floor
- Add ripples in the puddle
- Add caustic light effects (optional, complex)

Let me just write it.

I'll start now.

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Aquarium Catastrophe</title>
<style>
  /* ... */
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div id="ui">
  <!-- ... -->
</div>
<script>
'use strict';
// ... main code ...
</script>
</body>
</html>
```

OK let me write it for real now. Here we go.

For the puddle rendering, I'll use the heightfield to draw a filled shape on the floor. The puddle surface is a horizontal line at floorY - puddleH[i] for each cell. I'll draw the puddle as a filled polygon with a slight gradient for depth effect.

For the waterline inside the tank, I can add a slight wave effect with sin function or just leave it flat.

For the fish, I'll draw them as ellipses with a tail. The body can have a small fin, eye, and gradient. They have a "swim" animation that wiggles the tail.

For the plants, I'll draw each segment as a curved line, with leaf-like shapes. The chain of segments forms a wavy plant.

For the rocks, I'll draw irregular polygons in brown/grey colors.

For the toy duck, I'll draw a yellow circle with a smaller circle (head) and a beak.

OK writing now. I'll just write the whole thing and not stop.

Wait, let me also think about how the user knows to drag the crack. I should have a clear visual indication. Let me make the crack visibly draggable - maybe a slight glow when hovering, and a different cursor.

Also, I should make the trigger button stand out. The "Trigger Failure" button should be red/dramatic.

Let me write the CSS and HTML for the UI first:

```html
<style>
  body {
    margin: 0;
    background: #0a0805;
    overflow: hidden;
    font-family: 'Georgia', serif;
    color: #e8d4a0;
    user-select: none;
    -webkit-user-select: none;
  }
  canvas { display: block; }
  canvas.grab { cursor: grab; }
  canvas.grabbing { cursor: grabbing; }
  
  #panel {
    position: fixed;
    top: 16px;
    left: 16px;
    background: linear-gradient(135deg, rgba(40,25,15,0.95), rgba(25,15,10,0.95));
    border: 1px solid #6a4a30;
    padding: 14px 18px;
    border-radius: 6px;
    font-size: 13px;
    line-height: 1.6;
    max-width: 320px;
    box-shadow: 0 6px 24px rgba(0,0,0,0.6);
    z-index: 10;
  }
  #panel h1 {
    margin: 0 0 10px 0;
    font-size: 18px;
    font-weight: normal;
    color: #f0c878;
    letter-spacing: 2px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
  }
  #panel p {
    margin: 0 0 10px 0;
    font-size: 12px;
    color: #c0a878;
  }
  #status {
    font-style: italic;
    color: #d4b890;
    min-height: 18px;
    margin: 8px 0;
  }
  button {
    background: linear-gradient(180deg, #7a2828, #5a1818);
    color: #ffe8b0;
    border: 1px solid #aa4848;
    padding: 8px 16px;
    cursor: pointer;
    font-family: inherit;
    font-size: 13px;
    border-radius: 3px;
    margin-right: 8px;
    margin-top: 4px;
    transition: all 0.2s;
    text-shadow: 0 1px 1px rgba(0,0,0,0.4);
  }
  button:hover:not(:disabled) {
    background: linear-gradient(180deg, #9a3838, #7a2828);
    box-shadow: 0 0 8px rgba(255,100,100,0.3);
  }
  button:disabled { opacity: 0.4; cursor: not-allowed; }
  button.secondary { background: linear-gradient(180deg, #3a3020, #2a2010); border-color: #6a5a40; }
  button.secondary:hover:not(:disabled) { background: linear-gradient(180deg, #4a4030, #3a3020); }
  .info { font-size: 11px; color: #8a7858; margin-top: 6px; font-style: italic; }
</style>
```

OK let me just write the whole thing now without further interruption.

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Aquarium Catastrophe</title>
<style>
body { margin: 0; background: #0a0805; overflow: hidden; font-family: 'Georgia', serif; color: #e8d4a0; user-select: none; -webkit-user-select: none; }
canvas { display: block; }
canvas.grab { cursor: grab; }
canvas.grabbing { cursor: grabbing; }
#panel { position: fixed; top: 16px; left: 16px; background: linear-gradient(135deg, rgba(40,25,15,0.95), rgba(25,15,10,0.95)); border: 1px solid #6a4a30; padding: 14px 18px; border-radius: 6px; font-size: 13px; line-height: 1.6; max-width: 320px; box-shadow: 0 6px 24px rgba(0,0,0,0.6); z-index: 10; }
#panel h1 { margin: 0 0 10px 0; font-size: 17px; font-weight: normal; color: #f0c878; letter-spacing: 1.5px; text-shadow: 0 1px 2px rgba(0,0,0,0.5); }
#panel p { margin: 0 0 8px 0; font-size: 12px; color: #c0a878; }
#status { font-style: italic; color: #d4b890; min-height: 18px; margin: 8px 0; font-size: 12px; }
button { background: linear-gradient(180deg, #7a2828, #5a1818); color: #ffe8b0; border: 1px solid #aa4848; padding: 8px 16px; cursor: pointer; font-family: inherit; font-size: 13px; border-radius: 3px; margin-right: 8px; margin-top: 4px; transition: all 0.2s; text-shadow: 0 1px 1px rgba(0,0,0,0.4); }
button:hover:not(:disabled) { background: linear-gradient(180deg, #9a3838, #7a2828); box-shadow: 0 0 10px rgba(255,100,100,0.3); }
button:disabled { opacity: 0.4; cursor: not-allowed; }
button.secondary { background: linear-gradient(180deg, #3a3020, #2a2010); border-color: #6a5a40; }
button.secondary:hover:not(:disabled) { background: linear-gradient(180deg, #4a4030, #3a3020); }
.info { font-size: 11px; color: #8a7858; margin-top: 6px; font-style: italic; }
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div id="panel">
  <h1>⚠ Aquarium Catastrophe ⚠</h1>
  <p>Drag the <b>crack</b> on the right side of the tank to position it. Then trigger structural failure.</p>
  <div id="status">Awaiting breach…</div>
  <div>
    <button id="triggerBtn">⚡ Trigger Failure</button>
    <button id="resetBtn" class="secondary">↻ Reset</button>
  </div>
  <div class="info">Lower cracks → greater pressure → stronger jet. A crack near the top yields a gentler spill.</div>
</div>
<script>
'use strict';
// [code]
</script>
</body>
</html>
```

OK now the code. Let me write the JavaScript.

```javascript
'use strict';

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
const statusEl = document.getElementById('status');
const triggerBtn = document.getElementById('triggerBtn');
const resetBtn = document.getElementById('resetBtn');

let W = 0, H = 0;
let dpr = 1;
function resize() {
  dpr = Math.max(1, window.devicePixelRatio || 1);
  W = window.innerWidth;
  H = window.innerHeight;
  canvas.width = W * dpr;
  canvas.height = H * dpr;
  canvas.style.width = W + 'px';
  canvas.style.height = H + 'px';
  ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
}

// === Configuration ===
const GRAVITY = 1400;  // px/s²
const PUDDLE_RES = 5;  // px per cell
const MAX_PARTICLES = 800;

// === Globals ===
let state = 'intact';
let lastT = 0;
let elapsed = 0;
let draggingCrack = false;
let hoverCrack = false;

const TANK = {};
let waterTopY = 0;
let waterLevelVel = 0;

let fishes = [];
let plants = [];
let rocks = [];
let toys = [];
let particles = [];
let shards = [];
let ambientBubbles = [];
let splashParticles = [];

// Puddle height field (1D, indexed by x)
let puddleH = null;  // Float32Array
const PUDDLE_LEFT = 0;  // index for leftmost puddle
const PUDDLE_RIGHT = 0;  // index for rightmost

// === Init ===
function init() {
  // Tank dimensions
  const tankW = Math.min(580, W * 0.5);
  const tankH = Math.min(440, H * 0.62);
  TANK.w = tankW;
  TANK.h = tankH;
  TANK.x = Math.max(80, W * 0.5 - tankW * 0.55);
  TANK.y = H - tankH - 90;  // 90px cabinet + floor margin
  TANK.crackTop = TANK.y + TANK.h * 0.55;
  TANK.crackBot = TANK.crackTop + 60;
  TANK.cracked = false;
  TANK.failed = false;
  TANK.shake = 0;
  
  waterTopY = TANK.y + 20;
  
  // Init objects
  fishes = createFishes(5);
  plants = createPlants(3);
  rocks = createRocks(8);
  toys = createToys(1);
  
  // Init puddle
  const n = Math.ceil(W / PUDDLE_RES) + 2;
  puddleH = new Float32Array(n);
  
  // Init particles
  particles = [];
  shards = [];
  splashParticles = [];
  ambientBubbles = [];
  for (let i = 0; i < 25; i++) ambientBubbles.push(makeBubble());
  
  state = 'intact';
  statusEl.textContent = 'Drag the crack to set its height, then trigger failure.';
  triggerBtn.disabled = false;
}

function floorY() { return H - 90; }

function makeBubble() {
  return {
    x: TANK.x + 30 + Math.random() * (TANK.w - 60),
    y: TANK.y + TANK.h - 20 - Math.random() * (TANK.h * 0.6),
    r: 1 + Math.random() * 2.5,
    speed: 8 + Math.random() * 10,
    wobble: Math.random() * Math.PI * 2
  };
}

function createFishes(n) {
  const arr = [];
  for (let i = 0; i < n; i++) {
    arr.push({
      x: TANK.x + 60 + Math.random() * (TANK.w - 120),
      y: TANK.y + 80 + Math.random() * (TANK.h - 150),
      vx: 30 + Math.random() * 40,
      vy: 0,
      size: 12 + Math.random() * 8,
      hue: 15 + Math.random() * 30,
      tailPhase: Math.random() * Math.PI * 2,
      swimSpeed: 25 + Math.random() * 30,
      alive: true,
      ejected: false,
      state: 'swim',  // swim, ejected, dead
      panic: 0,
      age: Math.random() * 10
    });
  }
  return arr;
}

function createPlants(n) {
  const arr = [];
  const segCount = 10;
  for (let i = 0; i < n; i++) {
    const baseX = TANK.x + 60 + (TANK.w - 120) * (i + 0.5) / n;
    const height = 100 + Math.random() * 100;
    const segs = [];
    for (let j = 0; j <= segCount; j++) {
      const t = j / segCount;
      segs.push({
        x: baseX + Math.sin(t * 5 + i) * 3,
        y: TANK.y + TANK.h - t * height,
        ox: baseX,  // original anchor x
        oy: TANK.y + TANK.h - t * height
      });
    }
    arr.push({
      segs,
      hue: 80 + Math.random() * 50,
      width: 5 + Math.random() * 4,
      baseX
    });
  }
  return arr;
}

function createRocks(n) {
  const arr = [];
  for (let i = 0; i < n; i++) {
    const size = 16 + Math.random() * 24;
    const baseX = TANK.x + 30 + Math.random() * (TANK.w - 60);
    const baseY = TANK.y + TANK.h - size * 0.5;
    const points = [];
    const numPoints = 7 + Math.floor(Math.random() * 4);
    for (let p = 0; p < numPoints; p++) {
      const a = p / numPoints * Math.PI * 2;
      const r = size * 0.5 * (0.7 + Math.random() * 0.5);
      points.push({ x: Math.cos(a) * r, y: Math.sin(a) * r * 0.6 });
    }
    arr.push({
      x: baseX, y: baseY,
      vx: 0, vy: 0,
      size, points,
      hue: 20 + Math.random() * 20,
      sat: 10 + Math.random() * 15,
      light: 25 + Math.random() * 15,
      angle: 0
    });
  }
  return arr;
}

function createToys(n) {
  const arr = [];
  for (let i = 0; i < n; i++) {
    arr.push({
      x: TANK.x + TANK.w * 0.4,
      y: waterTopY - 8,
      vx: 0, vy: 0,
      size: 16,
      type: 'duck',
      bobPhase: Math.random() * Math.PI * 2,
      ejected: false
    });
  }
  return arr;
}
```

OK I'm going to stop planning and just write the whole file. Let me commit to writing it now.

For the jet, I'll spawn particles with:
- Random y in [max(crackTop, currentEffectiveTop), crackBot]
- Initial vx = sqrt(2 * g * (y - waterTopY)) * Cd
- Random vy slightly up and to the side
- Small random spread

For the puddle update:
- Each cell has water height
- Each frame, water flows to lower neighbors based on height difference
- Water leaves the right edge of the room (drains)

For the fish, I'll have them try to swim left (away from crack), but the current pushes them right. If the fish reaches the crack zone, it gets ejected.

Hmm, "Fish attempting to swim against the current before being swept through the breach" - so the fish first swim against the current, then get swept through.

Let me model this:
- Each fish has a target direction (away from crack)
- Fish applies swim force in target direction
- Current applies force in crack direction
- When current is stronger than swim, fish is pushed toward crack
- When fish reaches crack, it gets ejected (transitions to airborne)

For the toy:
- Toy floats on water surface (y = waterTopY - size/2)
- Toy x is set initially, but as water level drops, the toy follows the surface
- The toy's x might drift with the current
- When the toy reaches the crack x position, it gets ejected

Actually, for the toy, since it floats on the surface, the current is strongest at the surface near the crack. The toy gets pushed toward the crack and then out.

Let me code:

```js
function updateToy(toy, dt) {
  if (toy.ejected) {
    // Airborne
    toy.vy += GRAVITY * dt;
    toy.x += toy.vx * dt;
    toy.y += toy.vy * dt;
    if (toy.y >= floorY()) {
      toy.y = floorY();
      toy.vy = 0;
      toy.vx *= 0.5;
      if (Math.abs(toy.vx) < 5) toy.vx = 0;
    }
  } else {
    // In water
    toy.y = waterTopY - toy.size * 0.6;
    if (TANK.failed) {
      const depthFactor = currentStrength(toy.x, toy.y);
      toy.vx += depthFactor * 80 * dt;  // pushed right
      toy.x += toy.vx * dt;
      toy.bobPhase += dt * 4;
      // Check if at crack
      if (toy.x > TANK.x + TANK.w - 5) {
        toy.ejected = true;
        toy.vx = Math.max(toy.vx, 200);
        toy.vy = -100 - Math.random() * 100;
      }
    } else {
      toy.bobPhase += dt * 2;
      toy.vx *= 0.95;
    }
  }
}

function currentStrength(x, y) {
  if (!TANK.failed) return 0;
  if (y > TANK.crackBot || y < TANK.crackTop) return 0.05;
  // Closer to right wall = stronger
  const xRel = (x - TANK.x) / TANK.w;  // 0 to 1
  return Math.pow(xRel, 3) * 2;
}
```

Hmm, this is getting complex. Let me simplify.

For each in-tank object, compute the current at its position:
- vx_current = 0 if no failure
- vx_current = something based on x and water level

For each object:
- Apply current force
- Apply object's own forces (buoyancy, swim, etc.)
- Update position
- Check if at the breach → eject

Let me think about a unified physics update:

```js
function updateInWaterObject(obj, dt) {
  if (obj.ejected) {
    // Airborne physics
    obj.vy += GRAVITY * dt;
    // Air drag
    obj.vx *= 0.99;
    obj.vy *= 0.99;
    obj.x += obj.vx * dt;
    obj.y += obj.vy * dt;
    return;
  }
  
  // Water physics
  // Buoyancy: pushes up if density < water
  // Drag: opposes velocity
  // Current: external force
  
  // Apply current
  if (TANK.failed) {
    const cur = currentAt(obj.x, obj.y);
    obj.vx += cur * dt * 100;
  }
  
  // Apply object's own forces
  // ... (varies by type)
  
  // Apply drag
  obj.vx *= Math.pow(0.5, dt * WATER_DRAG);
  obj.vy *= Math.pow(0.5, dt * WATER_DRAG);
  
  // Update position
  obj.x += obj.vx * dt;
  obj.y += obj.vy * dt;
  
  // Bounds checking
  if (obj.y < waterTopY) {
    obj.y = waterTopY;
    obj.vy = 0;
  }
  if (obj.y > TANK.y + TANK.h - 5) {
    obj.y = TANK.y + TANK.h - 5;
    obj.vy = 0;
  }
  if (obj.x < TANK.x + 5) {
    obj.x = TANK.x + 5;
    obj.vx = Math.abs(obj.vx);
  }
  
  // Check ejection
  if (TANK.failed && obj.x > TANK.x + TANK.w - 3) {
    obj.ejected = true;
    obj.vy = -50 - Math.random() * 100;
    obj.vx = Math.max(obj.vx, 150) + 50;
  }
}
```

OK I'll just write it. Let me commit to a design and just code it.

Let me write the whole HTML file now in one go. I'll be efficient.

Final design decisions:
- Aquarium is shown front-on, 2D
- Right side of tank has the crack
- Water jet shoots to the right
- Puddle spreads to the right of the tank
- Room has wooden floor and a cabinet under the tank
- 5 fish, 3 plants, 8 rocks, 1 rubber duck
- 800 max particles
- Puddle is 1D height field

Let me write the code now.

For the cabinet under the tank, I'll render a wooden cabinet with a door and handle. The tank sits on top.

For the room, I'll add:
- Wall (left and right edges) - dark wood paneling
- Floor - wooden planks
- A window on the left
- A picture frame on the wall
- A rug maybe

OK writing now.

Actually let me think about the rendering layers more carefully:

1. Background wall (whole canvas)
2. Window with view outside
3. Wall details (paneling, picture)
4. Floor
5. Cabinet
6. Aquarium back panel (dark blue or image)
7. Sand at bottom of tank
8. Water inside tank
9. Objects in tank (sorted by depth: rocks on bottom, plants in middle, fish swimming, toy at surface)
10. Front glass of tank (with reflections)
11. Cracks on front glass (before failure)
12. Water jet (in front of tank, going right)
13. Glass shards
14. Puddle on floor (in front of cabinet)
15. Ejected objects (fish, toy flying through air)
16. Tank frame/edges

For "in front of tank" elements (jet, shards, puddle), they should be rendered after the tank so they appear in front.

For "inside tank" elements (water, objects), they're rendered within the tank boundaries.

For glass shards that fly out: they should be in front of the tank but behind the jet (or maybe mixed). Let me put them in front of the tank and behind the jet.

For the ejected objects: they're in front of everything (foreground).

OK let me code.

```js
function render() {
  // Background
  drawBackground();
  drawWindow();
  drawWalls();
  drawFloor();
  drawCabinet();
  
  // Tank (back)
  drawTankBack();
  drawTankWater();
  drawSand();
  drawTankObjects();
  
  // Tank frame and glass
  drawTankFrame();
  drawTankGlass();
  drawCrack();
  
  // Outside effects
  drawShards();
  drawJet();
  drawPuddle();
  drawEjectedObjects();
  
  // Foreground
  drawForegroundDetails();
}
```

OK let me just write the whole thing. I'm going to stop overthinking and just code.

Here we go. Let me write the full file.

Let me decide the canvas size. Standard 16:9 viewport would be ~1920x1080. I'll use 1280x720 as a base. The canvas fills the window.

For the simulation:
- Tank: 560x420
- Tank position: x=300 (left of center), y=top of cabinet
- Cabinet: 600x90, under tank
- Floor: at bottom 90px
- Window: top-left corner, 200x300

Let me just code it. Here is the full file:

I'll write it now and not stop until done.

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Aquarium Catastrophe</title>
<style>...</style>
</head>
<body>
<canvas id="canvas"></canvas>
<div id="panel">...</div>
<script>
// All code here
</script>
</body>
</html>
```

OK let me just write it. I'll write it in one go and then check the result.

I realize I've been planning for too long. Let me just write the file. I'll iterate if needed.

For rendering the crack, I'll draw a dark jagged line on the right glass panel. The crack has a "top" and "bottom" point, and I can use a series of small zigzag lines to make it look like a crack.

For the shards, when they fly out, they're small rectangles (glass pieces) with rotation.

Let me start writing. I'll structure the code cleanly.

```js
// === Main Code ===

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
const statusEl = document.getElementById('status');
const triggerBtn = document.getElementById('triggerBtn');
const resetBtn = document.getElementById('resetBtn');

let W, H, dpr;
function resize() {
  dpr = Math.max(1, window.devicePixelRatio || 1);
  W = window.innerWidth;
  H = window.innerHeight;
  canvas.width = W * dpr;
  canvas.height = H * dpr;
  canvas.style.width = W + 'px';
  canvas.style.height = H + 'px';
  ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
  if (typeof init === 'function') init();
}
window.addEventListener('resize', resize);
resize();
```

Actually, I want init to only run on explicit reset, not on resize. Let me just recompute positions on resize.

OK let me code. Let me write the entire file now.

I'll think about the puddle more carefully. The user wants "a spreading puddle that collides with the room boundaries". So the puddle spreads until it hits a wall. In my 1D puddle model:
- Puddle extends from x = TANK.x + TANK.w (tank right edge) to wherever the water has reached.
- When the puddle reaches the right wall of the room (x = W), it stops spreading and pools up.

For "puddle collides with room boundaries" - the puddle has a maximum extent. Water can't go through walls.

In my 1D model, this is just: don't let puddle cells past the right wall index.

Also, the puddle should spread to the LEFT too (in front of the tank). When the puddle gets big, it would extend leftward and be in front of the cabinet.

Let me have the puddle span from the leftmost index with water to the rightmost. As water spreads, both leftward and rightward.

For the 1D puddle grid:
- Index i corresponds to x = PUDDLE_RES * i
- Puddle is stored in puddleH[i] for i = 0 to N-1
- N = ceil(W / PUDDLE_RES)
- The puddle is rendered as a filled region on the floor

Let me also add a "y" dimension for the puddle, so it can spread forward/backward. But in 2D side view, we don't see that. The puddle appears as a flat layer on the floor in side view.

OK 1D is fine. Let me just render the puddle as a thin layer with height = puddleH[i] on the floor at each x.

Actually, I realize the puddle on the floor in side view would look like this: a horizontal line that becomes thicker where the puddle is, with a thin "water layer" on top of the floor.

In side view, the floor is a horizontal line. The puddle sits on this line, with a small height (the depth of the water). The puddle is rendered as a region above the floor.

To make it look like a puddle on the floor:
- Draw a region on the floor where puddleH[i] > 0
- The region has height puddleH[i] (in screen pixels)
- The top of the puddle is at floorY - puddleH[i]
- The bottom is at floorY

For the visual style, I'll add a slight reflection on the puddle surface.

OK code time.

Let me also think about performance. With 800 max particles, 14 shards, 5 fish, 3 plants, 8 rocks, 1 toy, and a puddle grid of ~256 cells, this should run smoothly at 60fps.

For the bubbles inside the tank, I can have 20-30 ambient bubbles that slowly rise.

For the water surface wobble, I'll add a small sin-based wobble to the waterline.

For the plant animation, I'll have the plant segments sway with the current.

OK let me write the code now. I'm going to commit to a design and stop iterating.

Here we go. Writing the file.

Actually, one more thought: the user said "A visible waterline that lowers continuously rather than disappearing all at once". So the waterline should be visible and lower gradually as the tank drains. I'll draw the waterline as a slightly highlighted horizontal line on the water surface.

For the waterline to be visible:
- The water has a distinct surface (different color/reflection)
- The waterline is a horizontal line across the tank
- As water drains, the waterline moves down

I'll draw the waterline as a thin gradient line at waterTopY, with a slight ripple effect.

OK writing now.

Let me think about what the failure sequence looks like:

1. Tank is intact. Water at full level. Objects swimming. Bubbles. Crack visible on right side.
2. User clicks "Trigger Failure".
3. Crack widens slightly. Glass shards burst out. Water starts flowing.
4. Water jet emerges from crack, curving down due to gravity.
5. Water hits the floor to the right of the tank, forms a puddle.
6. Puddle spreads to the right (and left in front of tank).
7. As water drains, waterline in tank drops.
8. Fish try to swim against the current but get swept toward the crack.
9. Fish get ejected through the crack, fly through the air, land in the puddle.
10. The toy floats on the water, follows the waterline down.
11. When waterline reaches the crack, the toy is at the crack level and gets ejected.
12. Water continues to drain, puddle grows.
13. Eventually, water level is below the crack, no more water flows out.
14. Puddle continues to spread by surface tension, then settles.

For "Objects transitioning correctly from underwater motion to airborne motion and then to floor collisions":
- Fish: swim → swept by current → ejected (airborne) → land in puddle
- Toy: floats on water → at water surface, gets pushed by current → ejected → airborne → lands in puddle

The transition: when an object is at the breach, its motion changes from "water physics" to "air physics". The water physics had buoyancy, drag, current. The air physics has only gravity and air drag.

For the transition to be smooth, when an object exits the breach, it should have:
- Velocity = current velocity at the breach
- Acceleration = gravity
- Air drag (much less than water drag)

I'll implement this by having each object have a "ejected" flag. When ejected, the physics changes.

For the floor collision, when an object (ejected) hits the floor:
- y = floorY (snap to floor)
- vy = 0 (or bounce with damping)
- vx *= friction (slow down)

OK writing now. For real.

Let me start with the layout and rendering, then add physics.

```js
function renderRoom() {
  // Wall background
  ctx.fillStyle = '#1f1610';
  ctx.fillRect(0, 0, W, H);
  
  // Wall paneling (left and right)
  ctx.fillStyle = '#2a1f15';
  ctx.fillRect(0, 0, 80, H);
  ctx.fillRect(W - 80, 0, 80, H);
  
  // Wall texture (vertical lines for wood paneling)
  ctx.strokeStyle = 'rgba(0,0,0,0.2)';
  ctx.lineWidth = 1;
  for (let x = 0; x < 80; x += 15) {
    ctx.beginPath();
    ctx.moveTo(x, 0);
    ctx.lineTo(x, H);
    ctx.stroke();
  }
  for (let x = W - 80; x < W; x += 15) {
    ctx.beginPath();
    ctx.moveTo(x, 0);
    ctx.lineTo(x, H);
    ctx.stroke();
  }
  
  // Wall color (middle section)
  const wallGrad = ctx.createLinearGradient(0, 0, 0, H - 90);
  wallGrad.addColorStop(0, '#3a2818');
  wallGrad.addColorStop(1, '#2a1c10');
  ctx.fillStyle = wallGrad;
  ctx.fillRect(80, 0, W - 160, H - 90);
  
  // Window
  drawWindow();
  
  // Floor
  const floorGrad = ctx.createLinearGradient(0, H - 90, 0, H);
  floorGrad.addColorStop(0, '#4a3020');
  floorGrad.addColorStop(0.3, '#3a2515');
  floorGrad.addColorStop(1, '#2a1a10');
  ctx.fillStyle = floorGrad;
  ctx.fillRect(0, H - 90, W, 90);
  
  // Floor planks
  ctx.strokeStyle = 'rgba(0,0,0,0.3)';
  ctx.lineWidth = 1;
  for (let x = 0; x < W; x += 80) {
    ctx.beginPath();
    ctx.moveTo(x, H - 90);
    ctx.lineTo(x, H);
    ctx.stroke();
  }
  
  // Baseboard
  ctx.fillStyle = '#1a1008';
  ctx.fillRect(0, H - 95, W, 5);
}
```

For the cabinet:
```js
function drawCabinet() {
  // Cabinet top (where tank sits)
  ctx.fillStyle = '#4a2f1c';
  ctx.fillRect(TANK.x - 25, TANK.y + TANK.h, TANK.w + 50, 12);
  
  // Cabinet body
  const cabGrad = ctx.createLinearGradient(0, TANK.y + TANK.h + 12, 0, H - 90);
  cabGrad.addColorStop(0, '#3a2415');
  cabGrad.addColorStop(1, '#2a1a0d');
  ctx.fillStyle = cabGrad;
  ctx.fillRect(TANK.x - 25, TANK.y + TANK.h + 12, TANK.w + 50, H - 90 - (TANK.y + TANK.h + 12));
  
  // Cabinet doors
  ctx.strokeStyle = '#1a0d05';
  ctx.lineWidth = 2;
  for (let i = 0; i < 3; i++) {
    const dx = TANK.x - 25 + (TANK.w + 50) * i / 3;
    ctx.beginPath();
    ctx.moveTo(dx, TANK.y + TANK.h + 12);
    ctx.lineTo(dx, H - 95);
    ctx.stroke();
  }
  
  // Door handles
  ctx.fillStyle = '#aa8848';
  for (let i = 0; i < 3; i++) {
    const dx = TANK.x - 25 + (TANK.w + 50) * (i + 0.5) / 3;
    const handleY = (TANK.y + TANK.h + H - 95) / 2;
    ctx.beginPath();
    ctx.arc(dx, handleY, 4, 0, Math.PI * 2);
    ctx.fill();
  }
}
```

For the tank back panel:
```js
function drawTankBack() {
  // Tank back (dark blue/gradient)
  const backGrad = ctx.createLinearGradient(0, TANK.y, 0, TANK.y + TANK.h);
  backGrad.addColorStop(0, '#0a1820');
  backGrad.addColorStop(1, '#050a10');
  ctx.fillStyle = backGrad;
  ctx.fillRect(TANK.x, TANK.y, TANK.w, TANK.h);
}
```

For the water inside the tank:
```js
function drawTankWater() {
  // Water
  const waterGrad = ctx.createLinearGradient(0, waterTopY, 0, TANK.y + TANK.h);
  waterGrad.addColorStop(0, 'rgba(50, 120, 160, 0.85)');
  waterGrad.addColorStop(0.5, 'rgba(30, 80, 120, 0.9)');
  waterGrad.addColorStop(1, 'rgba(20, 50, 80, 0.95)');
  ctx.fillStyle = waterGrad;
  ctx.fillRect(TANK.x + 4, waterTopY, TANK.w - 8, TANK.y + TANK.h - waterTopY);
  
  // Waterline highlight
  ctx.fillStyle = 'rgba(150, 220, 240, 0.4)';
  ctx.fillRect(TANK.x + 4, waterTopY - 1, TANK.w - 8, 2);
  
  // Surface ripples
  ctx.strokeStyle = 'rgba(200, 240, 250, 0.5)';
  ctx.lineWidth = 1;
  ctx.beginPath();
  for (let x = TANK.x + 4; x <= TANK.x + TANK.w - 4; x += 8) {
    const y = waterTopY + Math.sin((x + elapsed * 50) * 0.05) * 1.5;
    if (x === TANK.x + 4) ctx.moveTo(x, y);
    else ctx.lineTo(x, y);
  }
  ctx.stroke();
}
```

For the tank glass:
```js
function drawTankGlass() {
  // Glass tint
  ctx.fillStyle = 'rgba(150, 200, 220, 0.06)';
  ctx.fillRect(TANK.x, TANK.y, TANK.w, TANK.h);
  
  // Glass edges
  ctx.strokeStyle = 'rgba(200, 230, 240, 0.4)';
  ctx.lineWidth = 3;
  ctx.strokeRect(TANK.x, TANK.y, TANK.w, TANK.h);
  
  // Glass highlights (left and top edges)
  ctx.strokeStyle = 'rgba(255, 255, 255, 0.3)';
  ctx.lineWidth = 1;
  ctx.beginPath();
  ctx.moveTo(TANK.x + 2, TANK.y + TANK.h);
  ctx.lineTo(TANK.x + 2, TANK.y + 2);
  ctx.lineTo(TANK.x + TANK.w - 2, TANK.y + 2);
  ctx.stroke();
  
  // Top frame
  ctx.fillStyle = '#1a1008';
  ctx.fillRect(TANK.x - 8, TANK.y - 8, TANK.w + 16, 12);
  ctx.strokeStyle = '#3a2418';
  ctx.lineWidth = 2;
  ctx.strokeRect(TANK.x - 8, TANK.y - 8, TANK.w + 16, 12);
}
```

For the crack:
```js
function drawCrack() {
  if (TANK.crackTop >= TANK.crackBot) return;
  
  // Crack as a jagged dark line on the right edge
  ctx.save();
  ctx.strokeStyle = '#0a0500';
  ctx.lineWidth = 2;
  ctx.beginPath();
  const len = TANK.crackBot - TANK.crackTop;
  let prevX = TANK.x + TANK.w;
  let prevY = TANK.crackTop;
  ctx.moveTo(prevX, prevY);
  const segs = 8;
  for (let i = 1; i <= segs; i++) {
    const t = i / segs;
    const y = TANK.crackTop + t * len;
    const x = TANK.x + TANK.w + (Math.random() - 0.5) * 4;
    ctx.lineTo(x, y);
  }
  ctx.stroke();
  ctx.restore();
}
```

Hmm, random per frame would make the crack jitter. Let me use a fixed seed or precompute the crack path.

Let me precompute:
```js
TANK.crackPath = [];
for (let i = 0; i <= 10; i++) {
  const t = i / 10;
  TANK.crackPath.push({
    x: TANK.x + TANK.w + (i % 2 === 0 ? 0 : (Math.random() - 0.5) * 3),
    y: TANK.crackTop + t * (TANK.crackBot - TANK.crackTop)
  });
}
```

Hmm, this should be generated once when init() runs, and updated when crack position changes.

Let me store the crack path in TANK and regenerate when crackTop changes.

Actually, for simplicity, let me just draw the crack as a few zigzag lines:
```js
function drawCrack() {
  if (TANK.crackTop >= TANK.crackBot) return;
  
  ctx.save();
  
  // Main crack line
  ctx.strokeStyle = 'rgba(0, 0, 0, 0.7)';
  ctx.lineWidth = 2;
  ctx.beginPath();
  const len = TANK.crackBot - TANK.crackTop;
  const seed = TANK.crackTop * 0.1;  // deterministic
  ctx.moveTo(TANK.x + TANK.w, TANK.crackTop);
  for (let i = 1; i <= 10; i++) {
    const t = i / 10;
    const y = TANK.crackTop + t * len;
    const xOff = Math.sin(i * 2.3 + seed) * 3;
    ctx.lineTo(TANK.x + TANK.w + xOff, y);
  }
  ctx.stroke();
  
  // Branch lines
  ctx.lineWidth = 1;
  for (let i = 0; i < 3; i++) {
    const t = 0.2 + i * 0.25;
    const y = TANK.crackTop + t * len;
    const len2 = 10 + i * 5;
    ctx.beginPath();
    ctx.moveTo(TANK.x + TANK.w - 5, y);
    ctx.lineTo(TANK.x + TANK.w - 5 - len2, y - 5);
    ctx.stroke();
  }
  
  ctx.restore();
}
```

OK this is getting long. Let me just write the file and stop overthinking.

I think my plan is solid. Let me just write the file. I'll use specific values and tweak as needed.

Let me write the file now in one big push.

Looking at this complex simulation, I need to build: 1. A 2D aquarium with realistic water physics (Torricelli's law for jet velocity) 2. Particle-based water jet with gravity-driven parabolic arc 3. Height-field puddle that spreads and respects room boundaries 4. Multiple object types with distinct physics (fish swim against current, plants sway, rocks sink, toy bobs) 5. Smooth underwater-to-airborne transitions 6. Draggable crack + visible waterline Let me build this as a single self-contained file:

→ bash {"command":"ls /tmp/ws/"}

toolResult

(no output)

assistant

→ write /tmp/ws/index.html (54508 bytes)

toolResult

Successfully wrote 54508 bytes to /tmp/ws/index.html

assistant

thinking

Now let me verify the file is well-formed and test it. Let me first check the file size and review the key parts.

→ bash {"command":"ls -la /tmp/ws/index.html && wc -l /tmp/ws/index.html"}

toolResult

-rw-r--r--. 1 node node 54553 Aug 2 15:57 /tmp/ws/index.html 1769 /tmp/ws/index.html

assistant

thinking

Good, the file is created. Let me check for any syntax errors by quickly reviewing key parts of the code.

Let me re-read a few sections to make sure everything is correct:

1. The crackHitTest function - I check crack drag based on mouse position
2. The jet spawning - based on Torricelli's law
3. The puddle - 1D height field
4. The water level dynamics
5. The fish/plant/rock/toy physics
6. The rendering

Let me check a few potential issues:

1. In the crackHitTest, I set mx range to TANK.x + TANK.w - 30 to TANK.x + TANK.w + 18. But the crack is drawn on the right edge of the tank, so this should work.

2. The crack drag updates the crackTop and crackBot. The function `rebuildCrackPath()` is called to update the visible path.

3. The water level dynamics - I have a constant 0.0042 which I should verify produces reasonable timing. Let me think: depth at start is about (TANK.y + TANK.h * 0.55 + 35) - (TANK.y + 22) ≈ TANK.h * 0.55 + 13 ≈ 250. sqrt(250) ≈ 15.8. With crackLen=70, outflow per frame ≈ 0.0042 * 15.8 * 70 * dt * 60 = 0.0042 * 15.8 * 70 * 0.016 * 60 ≈ 2.8 pixels/frame. Hmm, that would drain the tank in maybe 100 frames = 1.6 seconds. That's too fast. Let me adjust.

Actually wait, dt is in seconds. Let me re-derive. dt = 0.016 (1/60). So 0.0042 * sqrt(depth) * crackLen * dt * 60 = 0.0042 * 15.8 * 70 * 0.016 * 60 = 0.0042 * 15.8 * 70 * 0.96 = 4.46. So waterTopY increases by ~4.5 pixels per frame at start. Total drop needed: from TANK.y+22 to TANK.crackBot ≈ TANK.h * 0.55 + 35 to TANK.h * 0.55 + 35+22 = wait, this is from water level initial to crack bottom.

Initial waterTopY = TANK.y + 22
Crack top = TANK.y + TANK.h * 0.55
Crack bot = TANK.y + TANK.h * 0.55 + 70
So water needs to drop from TANK.y+22 to TANK.y + TANK.h*0.55+70
That's about TANK.h * 0.55 + 48 ≈ 250 + 48 = 298 pixels (for TANK.h = 460).

With 4.5 px/frame initial rate, decreasing over time, the total drain time would be around... let me estimate. Average rate of 2 px/frame over 298 px = 149 frames = 2.5 seconds. That's quite fast.

For a more dramatic slow drain, I should reduce the rate. Let me make the constant smaller. Actually the user might want a quick dramatic failure. Let me leave it for now and adjust if needed.

Actually I want the tank to drain in about 15-25 seconds for a more dramatic effect. Let me reduce the constant significantly. But the test will tell us.

Let me also check the particle count. With 3.5 * sqrt(depth/40) * dt * 60 particles per frame:
- depth = 250, sqrt(250/40) = 2.5, so 3.5 * 2.5 * 0.016 * 60 = 8.4 particles per frame initially
- 60 fps * 8.4 = 500 particles per second

After 1 second, MAX_PARTICLES = 900, so we cap out fast. But the particles also get removed when they land. Each particle lives for ~2 seconds (jet duration). So steady state = 500/s * 2s = 1000 particles. We cap at 900, so we'd be capped. That's fine.

But wait, my MAX_PARTICLES is 900, and the puddle also gets water. The particles that fall to the floor contribute to the puddle. Let me check: each particle adds `p.size * 0.06` to a cell. With size ~2, that's 0.12 per particle. 500 particles per second * 0.12 = 60 units per second added. The puddle spreads and decays, but it should accumulate.

Actually the water level dynamics is what determines the total water lost. Let me check that.

The water flow equation: outflow = 0.0042 * sqrt(depth) * crackLen * dt * 60
This is the rate of waterTopY increase. So total water "lost" = waterTopY increase.

OK so the simulation has 2 aspects:
1. Water level (waterTopY) decreases based on flow rate through crack
2. Particles spawn based on flow rate and arc through the air
3. Particles that hit the floor add to the puddle

The two are independent in my implementation. The water level decreases smoothly, while particles are spawned and follow physics. The particle count represents the visible water flow, but the actual water "loss" is determined by the level.

This is a bit of a fudge but should look reasonable. Let me verify by running the code.

Let me also think about potential issues:
- The plant `updatePlant` function - I have a constraint pass that might cause issues. Let me check.
- The rock update - rocks are stationary on the bottom but I have them with x position. When the current is strong, they might drift. That's intended.
- The toy update - the toy floats at waterTopY. When waterTopY drops below the tank bottom, the toy should still be visible. Let me check.
- The fish ejection - when a fish reaches the right side at the crack level, it gets ejected. Good.

Let me also think about what happens when the water level is below the crack but the tank is not yet "drained". The state transitions to 'drained' when waterTopY >= crackBot. After that, no more particles spawn, no more water level decrease.

After draining, the remaining water in the tank? Well, my model has water as a single level. When level reaches crackBot, all water is "drained". But that's not physically accurate - there could still be water below the crack. Let me think...

Actually, in my model, the waterTopY IS the water level. When waterTopY reaches crackBot, the water surface is at the bottom of the crack. The water below the crack stays in the tank. But for visual simplicity, I'll just say the tank is "drained" when level reaches crackBot.

Hmm, but the fish would be sitting on the bottom in the residual water. And the toy would be at the bottom too. Let me adjust: when waterTopY >= crackBot, stop the simulation but show the remaining water and objects as-is.

Wait, my updateWater sets waterTopY = crackBot and state = 'drained'. Then updateWater returns early. The fish and other objects still update.

The fish are at various y positions in the tank. After draining, they would fall to the bottom. But in my model, the fish are constrained to the water region (between waterTopY and TANK.y + TANK.h - 6). When waterTopY >= TANK.y + TANK.h - 6, the fish would be at the bottom.

But I think the visual would be: water drains, fish fall to the bottom with the water. That's fine.

Actually wait, my updateWater doesn't do anything for state = 'drained'. Let me check... yes, it returns early. So waterTopY stays at crackBot. But the fish still need to "fall" with the water.

For simplicity, let me say: after draining, the water level stays at crackBot (just below the crack), and the fish/objects are at the bottom of the tank.

Actually, I realize there's a subtle issue: the water level should drop continuously even past the crackBot in the real world (until all water is gone or the crack is plugged). But for visual purposes, I'll just stop the simulation when waterTopY reaches crackBot.

Let me also check that the fish fall correctly with the water. In updateFish, I have:
```
if (f.y < waterTopY + 6) { f.y = waterTopY + 6; f.vy = Math.abs(f.vy) * 0.3; }
```
This constrains the fish to be below the water surface. So as waterTopY increases (drains), the fish "rise" with the water. Wait, waterTopY increasing means water level is dropping. So the fish should be at the new water level. This constraint pushes the fish down to waterTopY + 6, which is correct.

OK let me also check: when waterTopY is at crackBot, the fish are at crackBot + 6 ≈ TANK.y + TANK.h * 0.55 + 70 + 6. The tank bottom is at TANK.y + TANK.h. So the fish are at height TANK.h - TANK.h*0.55 - 76 = 0.45*TANK.h - 76 ≈ 0.45*460 - 76 = 131. They're well above the bottom.

Hmm, that's a lot of "residual water" space. Visually, the water would be from crackBot to the bottom of the tank. That's a lot of water still in the tank.

Let me change the model: when waterTopY reaches crackBot, just set the tank state to "empty" and remove all water. The fish are on the bottom, the toy is on the bottom.

Actually, the prompt says "A visible waterline that lowers continuously rather than disappearing all at once". So the waterline should lower continuously. If I just stop the simulation when waterTopY reaches crackBot, the waterline stays at crackBot. That's not really "lowering continuously".

But realistically, the waterline would lower until it reaches the crack. Once it's at the crack, water doesn't flow out anymore (no pressure head). So the waterline stays at the crack level.

I think this is OK. The "lowering continuously" refers to the time during which water is flowing. After the water level reaches the crack, the simulation effectively ends.

Let me improve the simulation: after water reaches crack, keep draining slowly (water can still flow out the bottom of the crack, just with less pressure). Actually, that's what the equation already does. Let me check:

outflow = 0.0042 * sqrt(depth) * crackLen * dt * 60

When waterTopY = crackBot, depth = mid - waterTopY = crackBot/2 + crackTop/2 - crackBot = (crackTop - crackBot)/2 = -35. So depth < 0, no outflow.

I have:
```
if (depth <= 0) return;
```
So no water flows. The state transitions to 'drained'.

OK that's fine. The waterline stays at crackBot.

Let me look at the code one more time to make sure it's all correct, then I'll test it.

Actually, I realize there's an issue with the simulation. The fish in the residual water below the crack would still be subject to "current" in the residual water, but no water is flowing out. So the fish should just be sitting in still water below the crack.

In my current model, currentAt returns 0.05 when y is outside the crack. So there's still a small current. That's fine.

Let me also consider: when the tank has residual water, the fish are still in it. They might be near the bottom. The toy would be at the water surface, which is at crackBot. So the toy is at crackBot level. Hmm, but the toy can't be at crackBot - it would have been ejected earlier.

Wait, when does the toy get ejected? In updateToy:
```
if (t.x > TANK.x + TANK.w - 6) {
  t.x = TANK.x + TANK.w - 6;
  if (TANK.failed && t.y > TANK.crackTop - 6 && t.y < TANK.crackBot + 6) {
    t.ejected = true;
    ...
  }
}
```

So the toy gets ejected when:
- It's at the right side of the tank (x > TANK.x + TANK.w - 6)
- AND the tank has failed
- AND the toy's y is near the crack (between crackTop - 6 and crackBot + 6)

The toy's y is waterTopY - t.size * 0.6. So when waterTopY is near the crack (waterTopY between crackTop and crackBot), the toy is at the crack level and gets ejected.

Good. The toy gets ejected when waterTopY drops to the crack level. At that point, the toy is at the crack and gets pushed out.

After that, the toy is in the air or on the floor. The water continues to drain without the toy.

OK I think the simulation is logically correct. Let me test it.

Actually, let me also think about a few visual issues:
- The plant should be visible even when water drains (the part above water should still show)
- The fish should be visible above the water if they're ejected

For the plants, my drawing code draws all segments regardless of water level. So even when the water is low, the plant is fully drawn. Good.

For the fish, I check `if (!f.ejected)` to skip drawing them when they're in the tank. Wait, that's the opposite. Let me check:
```
for (const f of fishes) if (!f.ejected) drawFish(f);
```
So this draws non-ejected fish (in water). Then `drawEjectedObjects` draws ejected fish. So both in-water and ejected fish are drawn. Good.

Actually wait, after ejection, the fish is no longer in the tank. It can be flying through the air or on the floor. In my current model, after ejection, the fish follows airborne physics and lands on the floor. It doesn't return to the tank. So `if (!f.ejected)` for in-tank fish is correct.

OK I think the code is correct. Let me test it.

Let me also think about the crack visibility. The crack is drawn as a path with `crackPath`. The path is generated in `rebuildCrackPath` based on `crackTop` and `crackBot`. The crack is visible as a thin line on the right edge of the tank.

When the tank fails, the crack becomes a "breach" (dark gap). The water jet comes out of this breach.

Hmm, the water jet particles spawn at `TANK.x + TANK.w + 2`, which is just outside the right edge of the tank. The breach is drawn from `TANK.x + TANK.w - 2` to `TANK.x + TANK.w + 6`. The water should emerge from this gap.

Let me check the spawn position more carefully. The particles spawn at `TANK.x + TANK.w + 2`, which is right at the edge. That's the gap location. Good.

But wait, the breach is drawn at `TANK.x + TANK.w - 2`, so the right side of the breach is at `TANK.x + TANK.w + 6` (max). The particles should spawn somewhere in this range. Spawning at `TANK.x + TANK.w + 2` is fine.

OK let me run the code. I'll use a simple HTML test in node or just check the structure.

Actually I can't easily run a browser simulation. Let me just verify the JS syntax by reading through the file.

Let me also check that the canvas size handling is correct. On resize, I call layout() which sets TANK dimensions. On init, I call layout() too.

But layout() is called from resize() which is called on window resize. Init() also calls layout(). Good.

Wait, init() is called once at the start. Then resize() might be called if the user resizes. layout() is called in both, so dimensions are updated.

But what about waterTopY? In layout(), I check `if (!waterTopY) waterTopY = TANK.y + 22`. So if waterTopY is set, it's not updated. If not, it's set to the initial value.

For the resize scenario, if the user resizes after the simulation has started, waterTopY should be updated relative to the new TANK.y. Let me think...

Actually, let me just reset the simulation on resize. That's simpler.

Or, on resize, I should reposition everything. Let me update the layout function to also update waterTopY and crack positions.

Hmm, but the simulation has progressed - fish are moving, water is draining, etc. If I resize, I should probably reset.

Let me just trigger init() on resize. That's the simplest approach.

But init() resets all the objects. That's annoying for the user.

Let me handle this differently: on resize, just update the TANK dimensions, waterTopY relative to new tank, and recompute crack path. Don't reset the simulation state.

Actually, the simplest is: on resize, reinitialize. The user can re-trigger if they want to see the simulation again.

Let me update the resize handler to call init() instead of layout():

```js
window.addEventListener('resize', () => { resize(); init(); });
```

But wait, init() calls layout(), so I need to be careful. Let me trace through:
1. resize() sets canvas dimensions
2. init() sets TANK state, then calls layout() which uses canvas dimensions
3. init() creates objects based on TANK

This should work. Let me update.

Actually I have:
```js
function resize() {
  ...
  if (typeof layout === 'function') layout();
}
```

And init() calls layout() at the end. So the sequence is:
- On load: resize() → layout() with default TANK values; init() → layout() with reset TANK values
- On resize: resize() → layout() with current TANK values; init() not called (only layout)

This means on resize, the TANK dimensions change but the objects don't. The objects (fish, plants, etc.) are at their old positions, which may be outside the new TANK bounds.

Let me fix this. On resize, I should re-run init() to reset everything.

Actually wait, on resize the user might be in the middle of watching the simulation. Resetting is annoying.

Hmm, let me think about this. For the simulation to be correct after resize:
- TANK dimensions change
- waterTopY should change proportionally
- fish/rocks/etc. positions should change proportionally
- crack position should change proportionally

This is complex. Let me just reset on resize for simplicity. The user can re-trigger.

Actually, a simpler approach: just don't worry about resize. Most users won't resize during the simulation. And if they do, the simulation will be a bit broken but still work.

Or, lock the canvas size to a fixed value. But that doesn't fit the "single page web app" feel.

Let me just call init() on resize. If the user is in the middle of the simulation, they can restart.

OK let me update the code.

Actually, the cleanest approach: in resize(), call init() to fully reset. The simulation is more important than preserving state across resizes.

Let me update:
```js
window.addEventListener('resize', () => { resize(); init(); });
```

But init() calls layout() which uses the canvas size. So order is: resize() (sets canvas size), then init() (resets state and lays out).

Let me also check: does init() have any issues if it's called multiple times? Looking at the code... init() resets all state variables. Should be fine.

Let me update.

Also, let me also think about the case where the user has the trigger button disabled because the simulation is in 'failing' state. On resize, init() resets state to 'intact' and re-enables the button. Good.

OK let me update the code.

Actually wait, I notice the resize handler currently is:
```js
window.addEventListener('resize', resize);
```

And resize() calls layout() at the end:
```js
function resize() {
  ...
  if (typeof layout === 'function') layout();
}
```

So on resize, only layout() is called, not init(). Let me change this to call init().

Actually, I realize I should think more carefully. The current behavior on resize:
- Canvas size changes
- TANK dimensions recompute
- waterTopY stays the same (might be wrong)
- Crack path rebuilds
- Objects (fish, plants, rocks) are at their old positions
- Puddle is at its old positions

This is inconsistent. Let me just init() on resize.

OK let me make the change.

Also, let me think about whether the simulation is too fast. The water drains quickly. Let me reduce the drain rate for a more dramatic effect.

Let me also test the code by reading it carefully.

Let me look at the file again to verify the structure is correct.

Actually, let me just run a simple syntax check using node.

Now let me check the code for syntax issues and test it:

→ bash

{"command":"cd /tmp/ws && node -e \"\nconst fs = require('fs');\nconst html = fs.readFileSync('index.html', 'utf-8');\n// Extract the script

toolResult

SYNTAX ERROR: Unexpected token 'var'

assistant

thinking

My replacement was too aggressive. Let me try a different approach.

→ bash

{"command":"cd /tmp/ws && node -e \"\nconst fs = require('fs');\nconst html = fs.readFileSync('index.html', 'utf-8');\nconst m = html.match(

toolResult

SYNTAX ERROR: Unexpected token ';' Near: SyntaxError: Unexpected token ';' at new Function (<anonymous>) at [eval]:9:3 at runScriptInThisContext (node:internal/vm:219:10) at node:internal/process/execution:451:12

assistant

thinking

The issue is my mock object is malformed. Let me try a different approach - just use acorn or esprima to parse the JS.

→ bash

{"command":"cd /tmp/ws && node -e \"\nconst fs = require('fs');\nconst html = fs.readFileSync('index.html', 'utf-8');\nconst m = html.match(

toolResult

JS length: 51466 SYNTAX OK

assistant

thinking

Good, the syntax is valid. Now let me do a careful review of the code and think about improvements.

Let me read through the file to make sure everything is correct.

Syntax is valid. Let me now do a careful review of the code to find any logical issues:

→ read {"path":"/tmp/ws/index.html","offset":170,"limit":120}

toolResult

assistant

thinking

Let me check a few more sections of the file, especially the rendering and physics.

→ read {"path":"/tmp/ws/index.html","offset":630,"limit":120}

toolResult

for (let i = 0; i < Math.floor(12 / PUDDLE_RES); i++) puddleH[i] = 0; } // ============================================================= // Water level (drain dynamics) // ============================================================= function updateWater(dt) { if (!TANK.failed) return; if (waterTopY >= TANK.crackBot) { waterTopY = TANK.crackBot; state = 'drained'; return; } // outflow proportional to sqrt(depth) const mid = (TANK.crackTop + TANK.crackBot) / 2; const depth = Math.max(0, mid - waterTopY); if (depth <= 0) return; const crackLen = TANK.crackBot - TANK.crackTop; // dV/dt = Cd * A * sqrt(2*g*h) // In our pixel terms, we map this to rate of waterTopY drop. // Volume per second leaving ~ sqrt(depth). We tune so the tank drains in ~25 s for mid crack. const outflow = 0.0042 * Math.sqrt(depth) * crackLen * dt * 60; waterTopY += outflow; totalWaterLost += outflow; // Mist near crack as water gushes if (Math.random() < Math.min(1, depth / 80) && state === 'failing') { spawnMist(TANK.x + TANK.w + 4, TANK.crackTop + Math.random() * (TANK.crackBot - TANK.crackTop)); } } // ============================================================= // Fish update // ============================================================= function updateFish(f, dt) { if (!f.alive) return; if (f.ejected) { // airborne f.vy += GRAVITY * dt; f.vx *= Math.pow(0.5, AIR_DRAG * dt); f.vy *= Math.pow(0.5, AIR_DRAG * dt); f.x += f.vx * dt; f.y += f.vy * dt; f.angle += f.angVel * dt; f.tailPhase += dt * 8; if (f.y >= floorY() - 4) { f.y = floorY() - 4; f.vy = -f.vy * 0.25; f.vx *= 0.6; f.angVel *= 0.6; if (Math.abs(f.vy) < 30) { f.vy = 0; f.onFloor = true; } } if (f.onFloor) { f.resting += dt; f.vx *= Math.pow(0.5, 3 * dt); if (Math.abs(f.vx) < 4) f.vx = 0; // occasional flop if (Math.random() < 0.01 && f.resting < 4) { f.vy = -120 - Math.random() * 80; f.vx = (Math.random() - 0.5) * 120; f.onFloor = false; } } // puddle check — fish can be in puddle water return; } // in-water motion f.age += dt; // swim: pick a target (left for safety, or wander) const current = currentAt(f.x, f.y); const curForce = current * 120; // opposing swim force const swimForce = (f.facing < 0 ? -1 : 1) * f.swimForce; // panic: more likely to face away from crack if (TANK.failed) { f.panic = Math.min(1, f.panic + dt * 0.5); if (Math.random() < 0.01) f.facing = -1; } else { f.panic = Math.max(0, f.panic - dt * 0.4); if (Math.random() < 0.005) f.facing = Math.random() < 0.5 ? -1 : 1; } f.vx += (swimForce - curForce * f.panic) * dt; f.vy += (Math.sin(f.age * 1.3 + f.x * 0.01) * 8) * dt; // gentle vertical wobble // drag in water f.vx *= Math.pow(0.5, WATER_DRAG * dt); f.vy *= Math.pow(0.5, WATER_DRAG * dt); f.x += f.vx * dt; f.y += f.vy * dt; f.tailPhase += dt * (6 + Math.abs(f.vx) * 0.05); // bound to water region & tank walls if (f.y < waterTopY + 6) { f.y = waterTopY + 6; f.vy = Math.abs(f.vy) * 0.3; } if (f.y > TANK.y + TANK.h - 6) { f.y = TANK.y + TANK.h - 6; f.vy = -Math.abs(f.vy) * 0.3; } if (f.x < TANK.x + 6) { f.x = TANK.x + 6; f.vx = Math.abs(f.vx); f.facing = 1; } if (f.x > TANK.x + TANK.w - 6) { // close to right wall — if failed, fish is at the breach f.x = TANK.x + TANK.w - 6; if (TANK.failed && f.y > TANK.crackTop - 4 && f.y < TANK.crackBot + 4) { // ejected! f.ejected = true; f.vx = Math.max(180, currentAt(f.x, f.y) * 100) + 80; f.vy = -60 - Math.random() * 100; f.angVel = (Math.random() - 0.5) * 12; f.angle = (Math.random() - 0.5) * 0.5; } else { f.vx = -Math.abs(f.vx); f.facing = -1; } } } // ============================================================= // Plants — verlet chain segments swayed by current [1021 more lines in file. Use offset=750 to continue.]

assistant

→ read {"path":"/tmp/ws/index.html","offset":1230,"limit":120}

toolResult

ctx.fillStyle = '#ffffff'; ctx.beginPath(); ctx.moveTo(TANK.x + TANK.w * 0.5, TANK.y); ctx.lineTo(TANK.x + TANK.w * 0.65, TANK.y); ctx.lineTo(TANK.x + TANK.w * 0.55, TANK.y + TANK.h); ctx.lineTo(TANK.x + TANK.w * 0.4, TANK.y + TANK.h); ctx.closePath(); ctx.fill(); ctx.restore(); } function drawCrack() { if (!TANK.cracked && state === 'intact') { // subtle pre-crack: show thin line ctx.save(); ctx.strokeStyle = 'rgba(0,0,0,0.55)'; ctx.lineWidth = 1.3; ctx.beginPath(); for (let i = 0; i < TANK.crackPath.length; i++) { const p = TANK.crackPath[i]; if (i === 0) ctx.moveTo(p.x, p.y); else ctx.lineTo(p.x, p.y); } ctx.stroke(); // side branches ctx.lineWidth = 0.9; for (const b of TANK.sideBranch) { ctx.beginPath(); ctx.moveTo(b.x1, b.y1); ctx.lineTo(b.x2, b.y2); ctx.stroke(); } ctx.restore(); return; } if (!TANK.failed) return; // After trigger: breach — dark gap on right edge ctx.save(); // Black gap for breach ctx.fillStyle = '#020403'; ctx.fillRect(TANK.x + TANK.w - 2, TANK.crackTop - 2, 8, TANK.crackBot - TANK.crackTop + 4); // Jagged edge of breach ctx.fillStyle = '#0a1418'; ctx.beginPath(); ctx.moveTo(TANK.x + TANK.w - 2, TANK.crackTop); for (let i = 0; i < TANK.crackPath.length; i++) { const p = TANK.crackPath[i]; ctx.lineTo(p.x, p.y); } ctx.lineTo(TANK.x + TANK.w - 2, TANK.crackBot); ctx.closePath(); ctx.fill(); // wet edges (slight blue) ctx.strokeStyle = 'rgba(80,160,200,0.6)'; ctx.lineWidth = 1.4; ctx.beginPath(); for (let i = 0; i < TANK.crackPath.length; i++) { const p = TANK.crackPath[i]; if (i === 0) ctx.moveTo(p.x, p.y); else ctx.lineTo(p.x, p.y); } ctx.stroke(); ctx.restore(); } // ============================================================= // Rendering — objects // ============================================================= function drawRock(r) { ctx.save(); ctx.translate(r.x, r.y); ctx.rotate(r.angle); // shadow ctx.fillStyle = 'rgba(0,0,0,0.3)'; ctx.beginPath(); ctx.ellipse(2, 6, r.size * 0.5, r.size * 0.15, 0, 0, Math.PI * 2); ctx.fill(); // body const grad = ctx.createRadialGradient(-r.size * 0.2, -r.size * 0.2, 1, 0, 0, r.size); grad.addColorStop(0, `hsl(${r.hue}, ${r.sat + 5}%, ${r.light + 12}%)`); grad.addColorStop(1, `hsl(${r.hue}, ${r.sat}%, ${r.light - 5}%)`); ctx.fillStyle = grad; ctx.beginPath(); for (let i = 0; i < r.points.length; i++) { const p = r.points[i]; if (i === 0) ctx.moveTo(p.x, p.y); else ctx.lineTo(p.x, p.y); } ctx.closePath(); ctx.fill(); // outline ctx.strokeStyle = `hsl(${r.hue}, ${r.sat}%, ${r.light - 12}%)`; ctx.lineWidth = 0.8; ctx.stroke(); // highlight ctx.fillStyle = 'rgba(255,240,200,0.18)'; ctx.beginPath(); ctx.ellipse(-r.size * 0.2, -r.size * 0.2, r.size * 0.2, r.size * 0.08, 0, 0, Math.PI * 2); ctx.fill(); ctx.restore(); } function drawPlant(pl) { ctx.save(); const segs = pl.segs; // Draw stem ctx.strokeStyle = `hsl(${pl.hue}, 50%, 22%)`; ctx.lineWidth = pl.width; ctx.lineCap = 'round'; ctx.lineJoin = 'round'; ctx.beginPath(); ctx.moveTo(segs[0].x, segs[0].y); for (let i = 1; i < segs.length; i++) { const s = segs[i]; ctx.lineTo(s.x, s.y); } ctx.stroke(); // Leaves at each segment for (let i = 2; i < segs.length; i += 2) { const s = segs[i]; [421 more lines in file. Use offset=1350 to continue.]

assistant

→ read {"path":"/tmp/ws/index.html","offset":1500,"limit":120}

toolResult

ctx.fillRect(-s.w / 2, -s.h / 2, s.w, s.h); ctx.strokeStyle = 'rgba(255,255,255,0.6)'; ctx.lineWidth = 0.6; ctx.strokeRect(-s.w / 2, -s.h / 2, s.w, s.h); // shine ctx.fillStyle = 'rgba(255,255,255,0.4)'; ctx.fillRect(-s.w / 2, -s.h / 2, s.w * 0.4, 1); ctx.restore(); } } function drawJet() { if (!TANK.failed) return; if (waterTopY >= TANK.crackBot) return; // Draw jet as a tapered parabolic stream // Use recent particles to form a tube const jetParticles = particles.filter(p => p.type === 'jet' && !p.onFloor); if (jetParticles.length < 2) return; // Sort by life (older particles further from source) // Find path centerline by binning x const bins = {}; for (const p of jetParticles) { const b = Math.floor(p.x / 8); if (!bins[b]) bins[b] = { sumY: 0, count: 0, top: -1e9, bot: 1e9 }; bins[b].sumY += p.y; bins[b].count++; if (p.y < bins[b].top) bins[b].top = p.y; if (p.y > bins[b].bot) bins[b].bot = p.y; } const xs = Object.keys(bins).map(Number).sort((a, b) => a - b); if (xs.length < 2) return; // outer surface (top and bottom) of jet ctx.save(); // Build top/bottom polylines const top = [], bot = []; for (const bx of xs) { const b = bins[bx]; const cx = bx * 8 + 4; top.push({ x: cx, y: b.top }); bot.push({ x: cx, y: b.bot }); } // Fill const fillGrad = ctx.createLinearGradient(0, TANK.crackTop, 0, floorY()); fillGrad.addColorStop(0, 'rgba(120,200,235,0.85)'); fillGrad.addColorStop(0.6, 'rgba(80,160,210,0.7)'); fillGrad.addColorStop(1, 'rgba(40,110,160,0.55)'); ctx.fillStyle = fillGrad; ctx.beginPath(); ctx.moveTo(top[0].x, top[0].y); for (let i = 1; i < top.length; i++) ctx.lineTo(top[i].x, top[i].y); for (let i = bot.length - 1; i >= 0; i--) ctx.lineTo(bot[i].x, bot[i].y); ctx.closePath(); ctx.fill(); // outline highlight on top ctx.strokeStyle = 'rgba(220,245,255,0.7)'; ctx.lineWidth = 1.2; ctx.beginPath(); for (let i = 0; i < top.length; i++) { if (i === 0) ctx.moveTo(top[i].x, top[i].y); else ctx.lineTo(top[i].x, top[i].y); } ctx.stroke(); // Draw individual particles for (const p of jetParticles) { if (p.onFloor) continue; const a = Math.min(1, p.life / 3); ctx.fillStyle = `rgba(180,225,245,${0.5 * a})`; ctx.beginPath(); ctx.arc(p.x, p.y, p.size, 0, Math.PI * 2); ctx.fill(); } // mist for (const p of particles) { if (p.type !== 'mist') continue; ctx.fillStyle = `rgba(220,235,250,${p.alpha * 0.25})`; ctx.beginPath(); ctx.arc(p.x, p.y, p.size, 0, Math.PI * 2); ctx.fill(); } ctx.restore(); // splash droplets for (const s of splash) { ctx.fillStyle = 'rgba(180,225,245,0.85)'; ctx.beginPath(); ctx.arc(s.x, s.y, s.size, 0, Math.PI * 2); ctx.fill(); } } function drawPuddle() { if (!puddleH) return; // Render as filled region above the floor ctx.save(); // Build a polygon top of the puddle const pts = []; let minIdx = -1, maxIdx = -1; for (let i = 0; i < puddleH.length; i++) { if (puddleH[i] > 0.02) { if (minIdx < 0) minIdx = i; maxIdx = i; } } if (minIdx < 0) { ctx.restore(); return; } // Smoothing: blend neighbors for (let i = minIdx; i <= maxIdx; i++) { const x = i * PUDDLE_RES; let h = puddleH[i]; const hL = i > 0 ? puddleH[i - 1] : 0; const hR = i < puddleH.length - 1 ? puddleH[i + 1] : 0; h = (h * 4 + hL + hR) / 6; const cap = 18; // max visible height const y = floorY() - Math.min(cap, h); pts.push({ x, y }); } [151 more lines in file. Use offset=1620 to continue.]

assistant

→ read {"path":"/tmp/ws/index.html","offset":1620,"limit":160}

toolResult

// Right end pts.push({ x: maxIdx * PUDDLE_RES, y: floorY() }); // Left end pts.unshift({ x: minIdx * PUDDLE_RES, y: floorY() }); // Fill const grad = ctx.createLinearGradient(0, floorY() - 18, 0, floorY()); grad.addColorStop(0, 'rgba(80,150,200,0.9)'); grad.addColorStop(0.5, 'rgba(50,110,160,0.92)'); grad.addColorStop(1, 'rgba(20,60,100,0.95)'); ctx.fillStyle = grad; ctx.beginPath(); ctx.moveTo(pts[0].x, pts[0].y); for (let i = 1; i < pts.length; i++) ctx.lineTo(pts[i].x, pts[i].y); ctx.closePath(); ctx.fill(); // Surface highlight ctx.strokeStyle = 'rgba(200,235,250,0.6)'; ctx.lineWidth = 1; ctx.beginPath(); for (let i = 0; i < pts.length; i++) { if (i === 0) ctx.moveTo(pts[i].x, pts[i].y); else ctx.lineTo(pts[i].x, pts[i].y); } ctx.stroke(); // top edge bright line ctx.strokeStyle = 'rgba(255,255,255,0.35)'; ctx.lineWidth = 0.6; ctx.beginPath(); for (let i = 1; i < pts.length - 1; i++) { ctx.moveTo(pts[i].x, pts[i].y); ctx.lineTo(pts[i].x + 1, pts[i].y); } ctx.stroke(); // shadow under puddle ctx.fillStyle = 'rgba(0,0,0,0.3)'; ctx.fillRect(pts[0].x, floorY(), (maxIdx - minIdx) * PUDDLE_RES, 3); ctx.restore(); } function drawEjectedObjects() { // fish airborne for (const f of fishes) if (f.ejected) drawFish(f); // toy airborne for (const t of toys) if (t.ejected) drawToy(t); // fish on floor for (const f of fishes) { if (!f.ejected) continue; // small shadow if (f.onFloor) { ctx.fillStyle = 'rgba(0,0,0,0.3)'; ctx.beginPath(); ctx.ellipse(f.x, floorY() + 2, f.size * 0.7, 2, 0, 0, Math.PI * 2); ctx.fill(); } } // wet floor under tank (overflow splash) ctx.save(); ctx.fillStyle = 'rgba(60,120,170,0.15)'; ctx.beginPath(); // soft wet area around the right side of the tank const wetX = TANK.x + TANK.w - 40; ctx.ellipse(wetX, floorY() - 2, 80, 8, 0, 0, Math.PI * 2); ctx.fill(); ctx.restore(); } // ============================================================= // Main update / render // ============================================================= function update(dt) { if (state === 'failing' || state === 'drained') { updateWater(dt); spawnJetParticles(dt); updateParticles(dt); updateShards(dt); updatePuddle(dt); } if (state === 'intact' || state === 'failing') { updateBubbles(dt); for (const f of fishes) updateFish(f, dt); for (const pl of plants) updatePlant(pl, dt); for (const r of rocks) updateRock(r, dt); for (const t of toys) updateToy(t, dt); } // ejected objects still update for (const f of fishes) if (f.ejected) updateFish(f, dt); for (const t of toys) if (t.ejected) updateToy(t, dt); // camera shake decay if (cameraShake > 0) cameraShake = Math.max(0, cameraShake - dt * 30); if (TANK.shake > 0) TANK.shake = Math.max(0, TANK.shake - dt * 8); if (state === 'failing' && TANK.failed) { TANK.shake = Math.max(TANK.shake, waterFlow * 0.3); } } function render() { ctx.save(); // camera shake if (cameraShake > 0) { const sx = (Math.random() - 0.5) * cameraShake; const sy = (Math.random() - 0.5) * cameraShake; ctx.translate(sx, sy); } drawRoom(); drawCabinet(); drawTank(); drawCrack(); drawPuddle(); // puddle on the floor (in front of cabinet for leftward extent) drawJet(); drawShards(); drawEjectedObjects(); ctx.restore(); } function loop(t) { const now = t * 0.001; let dt = now - lastT; if (dt > 0.05) dt = 0.05; lastT = now; elapsed += dt; update(dt); render(); // UI const totalH = TANK.h - 22; const cur = Math.max(0, Math.min(1, 1 - (waterTopY - (TANK.y + 22)) / totalH)); if (state === 'intact') { meterEl.style.width = '100%'; } else { meterEl.style.width = (cur * 100).toFixed(1) + '%'; } if (state === 'drained' && statusEl.textContent !== 'Tank drained. Press Reset.') { statusEl.textContent = 'Tank drained. Press Reset.'; } requestAnimationFrame(loop); } // boot init(); requestAnimationFrame(loop); </script> </body> </html>

assistant

thinking

Let me think about potential issues:

1. The puddle - I see I'm rendering the puddle after the tank but before the jet. The puddle should be in front of the tank's right edge (so it covers the bottom of the tank). But it should be behind the jet. Let me think about render order:
   - Room
   - Cabinet
   - Tank
   - Crack (breach)
   - Puddle (on floor, in front of cabinet)
   - Jet (in front of puddle, coming out of breach)
   - Shards
   - Ejected objects

   That's what I have. OK.

2. The plant update uses `prev.oy - s.oy` to compute rest length. But the segs' y values change when the plant sways. So `prev.oy` and `s.oy` are the original y values, which never change. Good.

3. The fish ejection: when a fish is at the right wall and in the crack zone, it gets ejected. The crack zone is crackTop to crackBot. As the water drains, the crack is fully exposed (waterTopY < crackTop), so the crack zone is from crackTop to crackBot. Fish in this zone get ejected. Good.

4. The fish swimming: I want the fish to "attempt to swim against the current before being swept through the breach". Let me check the current implementation:
   - Fish have a swim force
   - Current is computed at fish position
   - If current > swim force, fish is pushed
   - The fish "facing" direction determines swim direction
   - The fish faces away from the crack when in panic

   The current is strongest near the right side of the tank. As the crack opens, the current is strong. The fish can resist this if their swim force is high enough. But the current gets stronger as the water drains (because... actually, current depends on water level, not just position).

   Hmm, my currentAt function only depends on position:
   ```
   function currentAt(x, y) {
     if (!TANK.failed) return 0;
     if (y < TANK.crackTop - 4 || y > TANK.crackBot + 4) return 0.05;
     const xRel = (x - TANK.x) / TANK.w;
     return Math.pow(xRel, 2.2) * 2.4;
   }
   ```
   
   This doesn't account for the depth-dependent pressure. A real current would be stronger when more water is above the crack. Let me improve this.

   Actually, the current velocity at a point inside the tank is related to the flow rate through the breach. The flow rate is Q = A * sqrt(2*g*h). The current velocity at any point is roughly proportional to Q (in some cross-section).

   For simplicity, let me scale the current by the depth factor:
   ```
   function currentAt(x, y) {
     if (!TANK.failed) return 0;
     const mid = (TANK.crackTop + TANK.crackBot) / 2;
     const depth = Math.max(10, mid - waterTopY);
     const depthFactor = Math.min(1, depth / 100);  // 0..1
     if (y < TANK.crackTop - 4 || y > TANK.crackBot + 4) return 0.05 * depthFactor;
     const xRel = (x - TANK.x) / TANK.w;
     return Math.pow(xRel, 2.2) * 2.4 * depthFactor;
   }
   ```
   
   This makes the current stronger when the water level is high, and weaker as the tank drains. The fish will be swept more easily at the start.

5. The toy ejection: similar to fish. When the toy is at the right side and the crack is open, it gets ejected. As water drains, the toy's y (waterTopY - size*0.6) decreases. When it's at the crack level, the toy gets ejected.

   But wait, the toy's x might not be at the right side initially. The toy is at TANK.x + TANK.w * 0.35, which is to the left. The toy needs to drift right to get ejected.

   In my current code, the toy is pushed by the current. Let me check the toy's x progression:
   - Initial: TANK.x + TANK.w * 0.35 (about 35% from left)
   - Current pushes it right
   - When it reaches the right side and is in the crack zone, it gets ejected

   The toy's current push: t.vx += c * 90 * dt where c is currentAt. With c up to 2.4 * depthFactor, that's a strong push.

6. The crack position dragging: the user drags the crackTop. The crackBot is crackTop + 70. The drag is constrained to the tank's vertical range. Good.

7. The plant - my plant update might have issues with the verlet integration. Let me re-examine.

   The plant has segs[0] at the bottom (rooted), and segs[10] at the top. Each segment has x, y. The forces are applied to all segments except segs[0] (the root).

   The constraints keep segment distances constant. I do 2 passes. This should keep the plant relatively rigid.

   But there's an issue: my "rest" length is `(prev.oy - s.oy)`, which is the initial distance in y. After the plant sways, the actual distance might differ. The constraint pulls them back to the original distance.

   But the constraint might cause issues if the initial y-distance is 0 (when two segments are at the same y). That shouldn't happen with my init.

   Let me check: in createPlants, the segments are spaced evenly along y. So the y-difference is totalH / SEGS > 0. Good.

8. The water flow rate. I have:
   ```
   const outflow = 0.0042 * Math.sqrt(depth) * crackLen * dt * 60;
   ```
   
   With depth = 250, crackLen = 70, dt = 0.016:
   outflow = 0.0042 * 15.8 * 70 * 0.016 * 60 = 4.46 px/frame
   
   At 60 fps, that's 268 px/s. To drain 298 pixels, it takes about 1.1 seconds. Way too fast.
   
   Let me reduce this. I want a drain time of about 15-25 seconds. So the rate should be about 12-20 px/s = 0.2-0.33 px/frame.
   
   Let me reduce the constant from 0.0042 to about 0.0004. That gives 0.42 px/frame initially, 25 px/s, 12 seconds drain.
   
   Actually, the rate decreases as depth decreases. So the actual drain time would be longer. Let me think more carefully.
   
   d(waterTopY)/dt = 0.0042 * sqrt(h) * crackLen * 60
   where h = mid - waterTopY.
   
   Let h' = h. Then waterTopY = mid - h', so d(waterTopY)/dt = -dh'/dt.
   -dh'/dt = 0.0042 * sqrt(h') * 70 * 60
   dh'/dt = -17.64 * sqrt(h')
   
   dh'/sqrt(h') = -17.64 * dt
   2 * sqrt(h') = -17.64 * t + C
   sqrt(h') = C/2 - 8.82 * t
   
   At t=0, h' = h0 (initial depth), so C = 2*sqrt(h0).
   sqrt(h') = sqrt(h0) - 8.82 * t
   h' = 0 when t = sqrt(h0) / 8.82
   
   With h0 = 250 (rough), t = 15.8 / 8.82 = 1.79 seconds. So tank drains in 1.79 seconds.
   
   That's too fast. I need a slower drain. Let me reduce the constant by a factor of 10.
   
   New constant: 0.00042. Then 8.82 becomes 0.882, and t = 15.8 / 0.882 = 17.9 seconds. 
   
   Actually wait, the calculation has crackLen = 70 (a constant). Let me reduce the constant from 0.0042 to 0.0005.
   
   Actually wait, I need to think about this more carefully. The total "water" is from waterTopY to TANK.y + TANK.h. So the water "height" is TANK.h - (waterTopY - TANK.y). 
   
   When the tank is full, water "height" = TANK.h - 22. The water is lost when waterTopY increases.
   
   For the simulation, the rate of waterTopY increase is what matters. I want it to take 15-25 seconds.
   
   Initial depth (crack mid - waterTopY) = (TANK.y + TANK.h*0.55 + 35) - (TANK.y + 22) = TANK.h*0.55 + 13. For TANK.h = 460, that's 266.
   
   sqrt(266) = 16.3.
   
   I want initial rate of waterTopY increase to be about 15 px/s = 0.25 px/frame.
   
   0.25 = C * 16.3 * 70 * 0.016 * 60
   0.25 = C * 1095
   C = 0.000228
   
   Let me use 0.0003. Then initial rate = 0.0003 * 16.3 * 70 * 0.016 * 60 = 0.33 px/frame = 19.7 px/s. Drain time ≈ 15 seconds.
   
   Let me update the constant.

9. Let me also check the particle emission rate:
   ```
   const emission = 3.5 * Math.sqrt(depth / 40) * dt * 60;
   ```
   With depth = 266, emission = 3.5 * sqrt(6.65) * dt * 60 = 3.5 * 2.58 * 0.016 * 60 = 8.7 particles per frame.
   At 60 fps, that's 520 particles per second.
   
   With MAX_PARTICLES = 900, we'd cap out at 1.7 seconds of particles. The particles live for ~2 seconds (jet duration). So we hit the cap, but it's not too bad.
   
   Actually, the particles also get removed when they land. So the total in-flight particles is bounded. Let me check:
   - Particle spawn rate: 520/s
   - Particle lifetime: ~2-3 seconds (jet duration from source to floor)
   - Steady state: 520 * 2.5 = 1300 particles, capped at 900
   
   So we'd hit the cap. That's OK - the simulation just won't spawn more once we're at the cap.
   
   But this might mean the jet becomes less "dense" as more water flows. Let me increase MAX_PARTICLES or decrease the spawn rate.
   
   Let me increase MAX_PARTICLES to 1500 and check performance. Actually, with 1500 particles being updated each frame, the perf should still be fine on modern browsers.
   
   Actually, let me reduce the spawn rate instead. 3.5 * sqrt(depth/40) gives high rates. Let me change to 1.5:
   ```
   const emission = 1.5 * Math.sqrt(depth / 40) * dt * 60;
   ```
   With depth = 266, emission = 1.5 * 2.58 * 0.016 * 60 = 3.7 particles per frame. At 60 fps, 222 per second. Steady state: 555. Within MAX_PARTICLES.
   
   Hmm, but I want the jet to look dense. Let me keep the spawn rate high and just increase MAX_PARTICLES.

10. The fish ejection needs to be more "graceful". Right now, when a fish is at the right wall in the crack zone, it instantly gets ejected. Maybe I should let the fish be pushed against the wall for a moment before ejecting.
    
    Actually, the current code already does this - the fish has to be at TANK.x + TANK.w - 6 (close to the right wall) and in the crack zone. As the current pushes the fish right, it eventually reaches this position and gets ejected. That's natural.

11. The puddle spreading. The user wants the puddle to "collide with room boundaries". My current code stops the puddle at the right wall (index rightMax). Good. But the left side of the puddle is at the tank's right edge. Should the puddle also spread left (in front of the tank)?
    
    Hmm, in my model, the puddle is on the floor in front of the tank. The water jet lands to the right of the tank and the puddle grows. As the puddle grows, it could spread left (in front of the tank).
    
    In my 1D puddle model, the puddle indices go from 0 to rightMax. The puddle cells are anywhere. So if water lands at the right of the tank and the puddle grows, water spreads to neighboring cells. The cells to the left of the tank would be in front of the cabinet. The cells to the right are in the open floor.
    
    For now, my model just lets water flow in the 1D grid. The puddle naturally spreads in both directions from the impact point. Good.

12. The water level dynamics and the particles are independent. The water level drops smoothly, while the particles are spawned and arc. This is a reasonable simplification.

13. The water inside the tank. I draw it as a translucent blue rectangle from waterTopY to TANK.y + TANK.h. The waterline is at waterTopY. As waterTopY increases (water drains), the waterline moves down. Good.

14. The "visible waterline". I draw a bright line at the top of the water, plus ripples. As the water drains, this line moves down. Good.

15. The fish and other objects in the tank. They are drawn within the water region. The fish can move freely in the water. The toy is at the water surface. The plants are rooted.

16. The "shock" of the failure. When the user triggers failure, the camera shakes, the crack widens, and water starts flowing. I should add a sound effect or visual flash for impact, but the shake is a good start.

17. Bug: the puddleH might be null on the first frame. Let me check... init() creates puddleH. layout() checks if puddleH is not null. So after init, puddleH is created. Good.

18. Bug: the makeBubble function uses TANK.x and TANK.w which are set in init() via layout(). The bubbles are created in init() after layout(). Good.

19. The crack position. The user can drag the crack. The crackTop is constrained to TANK.y + 30 to TANK.y + TANK.h - 75. The crackBot is crackTop + 70. So the crack length is 70. Good.

20. The "lower crack produces stronger jet" requirement. My outflow formula:
    ```
    const outflow = 0.0042 * Math.sqrt(depth) * crackLen * dt * 60;
    ```
    depth = mid - waterTopY. When the crack is lower, mid is larger, so depth is larger (assuming waterTopY is the same). Larger depth → larger outflow → stronger jet. Good.

    The particle emission:
    ```
    const emission = 3.5 * Math.sqrt(depth / 40) * dt * 60;
    ```
    Same logic - lower crack → more particles. Good.

    The initial particle velocity:
    ```
    const v = Math.sqrt(2 * GRAVITY * Math.max(1, localDepth)) * 0.92;
    ```
    localDepth = py - waterTopY. Lower crack → larger localDepth at the same py → higher velocity. Good.

21. The fish swim: I want the fish to "attempt to swim against the current before being swept through the breach". The fish has a swimForce (max acceleration it can produce). The current produces a force based on position. If current force > swim force, fish is swept.
    
    My implementation:
    ```
    f.vx += (swimForce - curForce * f.panic) * dt;
    ```
    swimForce = (f.facing < 0 ? -1 : 1) * f.swimForce. f.facing is -1 (left) in panic.
    curForce = current * 120. current is currentAt(x, y).
    
    If curForce > swimForce, net force is positive (right). Fish moves right. If curForce < swimForce, net force is negative (left). Fish moves left.
    
    Hmm, curForce * panic: panic is 0-1, so curForce * panic is reduced. So if panic is low, the fish can resist the current. As panic increases, the fish is more affected.
    
    Actually, I think the panic should not affect the current force - the current is the same. The panic should affect the fish's "willingness" to swim. Let me reconsider.
    
    Actually, in my code, panic increases the curForce (multiplied by panic). That's weird. Let me re-read...
    
    ```
    f.vx += (swimForce - curForce * f.panic) * dt;
    ```
    
    If panic = 1, curForce is at full strength. If panic = 0, curForce is 0. So the fish is more affected by the current as it panics more.
    
    This doesn't quite match "fish attempts to swim against the current before being swept". The fish should always feel the current, but its swim force is what determines if it can resist.
    
    Let me change it:
    ```
    f.vx += (swimForce - curForce) * dt;
    ```
    
    This way, the fish always feels the current. The swim force determines if it can resist. As the current gets stronger (or the fish panics and swims less effectively), the fish is swept.
    
    Actually, the panic could affect the swim force (fish swims less effectively when panicking):
    ```
    f.vx += (swimForce * (1 - f.panic * 0.5) - curForce) * dt;
    ```
    
    Hmm, but I want the fish to "attempt to swim against the current". So the fish should be trying. Let me have the fish always try to swim against the current, with its facing direction.
    
    Let me simplify: fish has a swim speed. It tries to swim in its facing direction. The current pushes it. If current > swim, fish is swept.
    
    ```
    const swimVx = f.facing * f.swimSpeed;
    // Apply force towards swim speed
    f.vx += (swimVx - f.vx) * 5 * dt;  // soft control towards swim speed
    // Apply current
    f.vx += current * 80 * dt;
    // Drag
    f.vx *= Math.pow(0.5, WATER_DRAG * dt);
    ```
    
    Hmm, this is getting complex. Let me think.
    
    Actually, the simplest model: the fish has a "preferred velocity" (its swim velocity). The current adds to the velocity. The fish can resist by swimming in the opposite direction.
    
    ```
    // Fish desired velocity in water (without current)
    let desiredVx = -f.swimSpeed;  // try to swim left
    // Current force
    f.vx += current * 100 * dt;
    // Fish swim force towards desired velocity
    f.vx += (desiredVx - f.vx) * 3 * dt;
    // Drag (decay to zero)
    f.vx *= Math.pow(0.5, WATER_DRAG * dt);
    ```
    
    This means the fish tries to swim left (towards desired velocity), but the current pushes it right. The drag damps any velocity.
    
    If current is strong, the current wins and the fish moves right. The fish's "swim" is overwhelmed.
    
    Actually wait, my currentAt returns 0..2.4. Multiplied by 100, that's 0..240 px/s² acceleration. The fish swim force is 80..140 (swimForce). With desiredVx = -f.swimSpeed, the fish wants to swim left at 30..50 px/s.
    
    Hmm, the dynamics are getting complex. Let me just simplify:
    
    ```
    // Fish swimming
    const targetVx = f.facing * f.swimSpeed;
    // Current pushes fish
    f.vx += current * 120 * dt;
    // Fish swim force (spring towards target velocity)
    f.vx += (targetVx - f.vx) * 2 * dt;
    // Water drag
    f.vx *= Math.pow(0.5, 2 * dt);
    ```
    
    With current = 1.5 (mid tank), the current adds 1.5 * 120 = 180 px/s² acceleration. The fish's swim spring has time constant 0.5s, so it can keep up to targetVx ± (current / 2) ≈ ±75 px/s.
    
    Hmm, this is getting too complex. Let me just use a simple model:
    
    ```
    // current force
    f.vx += current * 80 * dt;
    // swim force (fish tries to go its facing direction)
    f.vx += f.facing * f.swimForce * dt;
    // drag
    f.vx *= Math.pow(0.5, WATER_DRAG * dt);
    ```
    
    With current = 1.5, current force = 1.5 * 80 = 120 px/s². Fish swim force = 100 ± 30. Net force on fish = 120 - 100 = 20 px/s² (right) if fish swims left. Fish accelerates right at 20 px/s².
    
    With drag (WATER_DRAG = 4), terminal velocity ≈ force / drag = 20 / 4 = 5 px/s (right). Slow.
    
    With current = 2.4 (close to crack), current force = 192. Net = 192 - 100 = 92 px/s². Terminal vx ≈ 92/4 = 23 px/s (right). Fast.
    
    OK this seems reasonable. The fish is slowly swept right, but the further right it goes, the stronger the current. Eventually, it gets pushed to the crack.
    
    But wait, I want the fish to "attempt to swim against the current before being swept". This means the fish should be visibly struggling. Let me add some visual: the fish wiggles more when in panic, and its tail moves faster.
    
    Actually, the tail speed is already dt * (6 + Math.abs(f.vx) * 0.05), so faster fish = faster tail. Good.
    
    Let me also make the fish face the current when panicking (as if bracing against it):
    
    Actually no, fish should face into the current to swim against it. So facing = -sign(current direction). The current is to the right (positive vx), so fish should face left.
    
    In my code, f.facing = -1 means facing left. When the tank fails, I set f.facing = -1 with probability 0.01 per frame. So most fish will face left eventually.
    
    OK let me leave the fish logic as is, but improve it slightly.
    
    Actually let me re-read my fish code:
    ```
    if (TANK.failed) {
      f.panic = Math.min(1, f.panic + dt * 0.5);
      if (Math.random() < 0.01) f.facing = -1;
    } else {
      f.panic = Math.max(0, f.panic - dt * 0.4);
      if (Math.random() < 0.005) f.facing = Math.random() < 0.5 ? -1 : 1;
    }
    
    f.vx += (swimForce - curForce * f.panic) * dt;
    ```
    
    So curForce * f.panic scales with panic. If panic = 0 (fish not scared yet), curForce = 0, so fish is unaffected by current. If panic = 1, curForce is at full strength.
    
    Hmm, this is weird. Let me change it to:
    
    ```
    f.vx += (swimForce - curForce) * dt;
    ```
    
    This way, the current always pushes the fish, and the fish always tries to swim against it. The panic doesn't affect the current force, but the swim force stays at f.swimForce.
    
    Actually, the fish might get "tired" or panicked and swim less effectively. Let me keep the panic reducing swim force:
    
    ```
    const effectiveSwimForce = f.swimForce * (1 - f.panic * 0.4);
    f.vx += (effectiveSwimForce * f.facing - curForce) * dt;
    ```
    
    Where f.facing is -1 (left, against the current). So the fish swims left with effectiveSwimForce, while the current pushes right with curForce. The net force determines the fish's motion.

22. Hmm, the panic is built up over time, so fish gradually get more panicked. That's a nice touch.

23. Let me think about whether the fish will actually be swept to the crack. With curForce = current * 120 and current up to 2.4 (at the right edge), that's 288 px/s². The fish swim force is 80-140 (with panic reducing to 60-100). Net force = 288 - 80 = 208 px/s² (right). With drag = 4, terminal velocity = 208/4 = 52 px/s. That's pretty fast.
    
    The tank is ~500 px wide. So the fish travels 500 / 52 ≈ 10 seconds to cross. But the current is stronger near the right, so the fish accelerates as it approaches.
    
    With acceleration 200 px/s² for 10 seconds, the fish would travel 10000 px in 10s. But it can only go 500 px (the tank width). So it reaches the crack in sqrt(2*500/200) = sqrt(5) = 2.2 seconds.
    
    OK so fish will reach the crack in a few seconds. Good.

24. Let me also check the toy. The toy floats on the surface. The toy's x changes based on current. With current = 2.4 (at right edge), the toy gets vx += 2.4 * 90 = 216 px/s². With drag = 2.5, terminal velocity = 216/2.5 = 86 px/s. So the toy moves right at 86 px/s.
    
    The tank is 500 wide. The toy starts at 35% = 175 px from left. So it needs to travel 325 px to reach the right. At 86 px/s, that's 3.8 seconds.
    
    Good.

25. Let me also think about the timing. The user triggers failure, then:
    - 0s: crack appears, shards fly
    - 0-15s: water drains, jet visible
    - Fish get swept (2-3s after trigger)
    - Toy gets swept (4s after trigger)
    - 15s: tank drained

26. Let me also check that the puddle actually accumulates. With 520 particles per second each adding 0.12 to a cell, that's 62 units per second. The puddle cells start at 0. With PUDDLE_SPREAD = 3.2 and the puddle having width, the puddle should grow.
    
    Hmm, let me check: when a particle lands, it adds to a cell. But if the cell already has water, the water spreads to neighbors. So the puddle grows in width over time.
    
    Let me trace: cell i has 1 unit. After one updatePuddle call (dt = 0.016), the cell loses some to neighbors. With PUDDLE_SPREAD = 3.2, the flow rate is significant.
    
    Actually, the cell doesn't lose to lower neighbors (since the cell is the only one with water). The flow is only between cells with height differences. So the water stays in the cell until the cell height exceeds neighbors, then it flows.
    
    Wait, my updatePuddle code has:
    ```
    const dl = h - lh;
    const dr = h - rh;
    if (dl > 0) { const f = Math.min(dl * 0.5, dl) * PUDDLE_SPREAD * dt; flow += f; }
    if (dr > 0) { const f = Math.min(dr * 0.5, dr) * PUDDLE_SPREAD * dt; flow += f; }
    next[i] = Math.max(0, h - flow);
    ```
    
    Hmm, `Math.min(dl * 0.5, dl)` is just `dl * 0.5` (since dl > 0). So `f = dl * 0.5 * PUDDLE_SPREAD * dt`.
    
    So for a cell with h=1 and neighbors lh=0, rh=0, the flow is `1 * 0.5 * 3.2 * 0.016 = 0.0256` to each neighbor. The cell loses 0.0512 to neighbors, retaining 0.95. So per second, the cell retains 0.95^60 ≈ 0.046. That decays quickly.
    
    Wait, that's wrong. The cell loses water to neighbors, but the neighbors then have water. So the water doesn't disappear, it spreads.
    
    Let me re-read the code:
    ```
    for (let i = 0; i < puddleH.length; i++) {
      const h = puddleH[i];
      if (h < 0.001) continue;
      let flow = 0;
      const lh = (i > 0) ? puddleH[i - 1] : 0;
      const rh = (i < puddleH.length - 1) ? puddleH[i + 1] : 0;
      const dl = h - lh;
      const dr = h - rh;
      if (dl > 0) { const f = Math.min(dl * 0.5, dl) * PUDDLE_SPREAD * dt; flow += f; }
      if (dr > 0) { const f = Math.min(dr * 0.5, dr) * PUDDLE_SPREAD * dt; flow += f; }
      next[i] = Math.max(0, h - flow);
    }
    for (let i = 0; i < puddleH.length; i++) {
      const lh = (i > 0) ? puddleH[i - 1] : 0;
      const rh = (i < puddleH.length - 1) ? puddleH[i + 1] : 0;
      if (lh > puddleH[i]) next[i] += (lh - puddleH[i]) * PUDDLE_SPREAD * dt * 0.5;
      if (rh > puddleH[i]) next[i] += (rh - puddleH[i]) * PUDDLE_SPREAD * dt * 0.5;
    }
    ```
    
    So the first loop computes the outflow from each cell. The second loop adds inflow from higher neighbors. This is a two-pass approach.
    
    The "flow" amount from cell i to neighbor j is `(h_i - h_j) * 0.5 * PUDDLE_SPREAD * dt`. This is the flow rate at the cell boundary.
    
    Wait, I notice an issue. The "flow" variable accumulates from both left and right, but the actual amount flowing depends on the boundary. Let me think...
    
    Actually, for a simple diffusion model, the flow from cell i to cell i+1 is `k * (h_i - h_{i+1})` where k is the diffusion coefficient. The cell i loses this flow, and cell i+1 gains it.
    
    In my code, I'm using a 2-pass approach:
    1. Each cell loses (h_i - h_neighbor) * factor to each neighbor (if positive difference)
    2. Each cell gains (h_neighbor - h_i) * factor from each neighbor (if positive difference)
    
    This is double-counting. The first pass only subtracts when h_i > h_neighbor. The second pass only adds when h_neighbor > h_i. So if h_i > h_neighbor, the first pass subtracts, and the second pass doesn't add. That's correct (one-way flow from high to low).
    
    If h_i < h_neighbor, the first pass doesn't subtract, and the second pass adds. That's also correct.
    
    If h_i = h_neighbor, no flow. Correct.
    
    So the model is right. Good.
    
    But wait, in the first pass, I have `Math.min(dl * 0.5, dl)`. If dl > 0, this is dl * 0.5. So the flow is half the height difference. That seems too much - it would drain the cell too fast.
    
    Let me think: if h_i = 1, lh = 0, rh = 0. Then dl = 1, dr = 1. flow = 0.5 * PUDDLE_SPREAD * dt + 0.5 * PUDDLE_SPREAD * dt = PUDDLE_SPREAD * dt = 3.2 * 0.016 = 0.0512. So next[i] = 0.95. After 60 frames, 0.95^60 = 0.046. After 1 second, the cell has lost 95% of its water to neighbors.
    
    But the neighbors now have water! So the total water in the system is conserved. The water spreads out.
    
    Actually wait, the second pass adds to cell i from higher neighbors. But in this case, lh = 0 and rh = 0, so no addition.
    
    So after 1 frame, cell i has 0.95, neighbors have 0.0256 each.
    
    After 2 frames: cell i has 0.95 - 0.0256 = 0.9244. Wait that's not right.
    
    Hmm, the issue is that the second pass uses the OLD puddleH values, but the first pass computed next from the old values. So the order matters.
    
    Let me trace:
    - Initial: puddleH[i] = 1, puddleH[i-1] = 0, puddleH[i+1] = 0
    - First pass: next[i] = 1 - 0.0256 - 0.0256 = 0.9488. next[i-1] = next[i+1] = 0 (not processed because h < 0.001)
    - Second pass: for i, lh = 0, rh = 0. No addition. next[i] = 0.9488.
    - Apply decay: next[i] = 0.9488 * 0.999 = 0.948
    - puddleH = next
    
    OK so after 1 frame, puddleH[i] = 0.948, neighbors still 0.
    
    After 2 frames:
    - First pass: dl = 0.948, dr = 0.948. flow = 0.0243 + 0.0243 = 0.0486. next[i] = 0.948 - 0.0486 = 0.8994.
    - But also: puddleH[i-1] = 0, but puddleH[i] = 0.948. For cell i-1, dl = 0, dr = 0.948. flow = 0.5 * 0.948 * 0.016 * 3.2 = 0.0243. So next[i-1] = 0 + 0.0243 = 0.0243. Similarly next[i+1] = 0.0243.
    - Second pass: for i, lh = 0, rh = 0 (still using old puddleH). No addition.
    - For i-1: lh = 0, rh = 0.948. Add (0.948 - 0) * 0.5 * 3.2 * 0.016 = 0.0243. So next[i-1] += 0.0243 = 0.0486.
    
    Hmm wait, the first pass already added 0.0243 to next[i-1]. And the second pass adds another 0.0243. So next[i-1] = 0.0486.
    
    Hmm, this is double counting. The first pass outflow from i should be inflow to i-1, not outflow from i-1.
    
    Let me think about this differently. In a proper diffusion:
    - flow from i to i-1: k * (h_i - h_{i-1})
    - flow from i to i+1: k * (h_i - h_{i+1})
    - h_i changes by: -flow_to_i-1 - flow_to_i+1 + flow_from_i-1 + flow_from_i+1
    
    The first pass in my code computes the "outflow" from i. But it stores the outflow in `flow` (local var) and then subtracts from next[i]. The neighbor's gain is computed separately.
    
    Hmm, let me re-read:
    ```
    for (let i = 0; i < puddleH.length; i++) {
      const h = puddleH[i];
      if (h < 0.001) continue;
      ...
      next[i] = Math.max(0, h - flow);
    }
    ```
    
    So next[i] = h - flow, where flow is the amount flowing OUT of i. So next[i] is the new height of i, accounting for outflow.
    
    The next loop:
    ```
    for (let i = 0; i < puddleH.length; i++) {
      const lh = (i > 0) ? puddleH[i - 1] : 0;
      const rh = (i < puddleH.length - 1) ? puddleH[i + 1] : 0;
      if (lh > puddleH[i]) next[i] += (lh - puddleH[i]) * PUDDLE_SPREAD * dt * 0.5;
      if (rh > puddleH[i]) next[i] += (rh - puddleH[i]) * PUDDLE_SPREAD * dt * 0.5;
    }
    ```
    
    This adds to next[i] the inflow from neighbors. lh > puddleH[i] means the left neighbor has more water, so water flows from left to right (into i). The amount is (lh - h_i) * factor.
    
    OK so the two passes together compute:
    - next[i] = h_i - outflow_from_i + inflow_to_i
    
    where outflow is the sum of (h_i - h_neighbor) * factor for each neighbor (if positive)
    and inflow is the sum of (h_neighbor - h_i) * factor for each neighbor (if positive)
    
    This is the standard diffusion equation, discretized. Good.
    
    But wait, in my code, the "outflow" is added to `flow` and then subtracted from next[i]. The "inflow" is added to next[i] directly. So:
    
    next[i] = h_i - sum_{n: h_i > h_n} (h_i - h_n) * factor + sum_{n: h_n > h_i} (h_n - h_i) * factor
    
    This is the right formula. Good.
    
    But there's an issue: the next loop uses the OLD puddleH values. So when computing inflow to cell i from cell i-1, it uses the old value of puddleH[i-1], not the new value (which is being computed in the same loop). This is a "split" approach that's commonly used for stability.
    
    OK so the model is correct. The water spreads out. Good.

27. Now let me think about the timing. With my constants:
    - outflow constant 0.0042 → too fast (1.8s drain)
    - I should reduce to 0.0005
    
    Let me update the constant.

28. The particle velocity. v = sqrt(2 * g * h). For h = 250, g = 1500, v = sqrt(750000) = 866. That's very fast! At 60 fps, the particle moves 866/60 = 14 pixels per frame. The tank is 500 wide, so the particle crosses the tank in 35 frames = 0.6 seconds.
    
    Hmm, that's fast. The user wants a "curved water jet affected by gravity". A 0.6s trajectory across the tank might be too short to show the curve.
    
    Let me reduce the gravity or scale the velocity.
    
    Actually, the velocity 866 px/s is the horizontal component. With gravity 1500, the particle would fall 0.5 * 1500 * 0.6^2 = 270 pixels in 0.6 seconds. The tank is 460 tall (from crack to floor). So the particle lands before leaving the tank horizontally.
    
    Wait, the tank crack is at the side. The particle starts at the right edge of the tank, with horizontal velocity. It goes right. The tank is to the left of the particle. The particle doesn't need to "cross" the tank horizontally.
    
    The tank is 460 tall (height). The crack is at some y. The particle goes from the crack to the floor. The horizontal distance from the crack to where the particle lands is determined by the horizontal velocity and time of flight.
    
    Time of flight: t = sqrt(2 * h / g) where h is the vertical distance from crack to floor.
    
    For h = 200 (from crack to floor), t = sqrt(2 * 200 / 1500) = sqrt(0.267) = 0.516 s.
    Horizontal distance: v * t = 866 * 0.516 = 447 px.
    
    So the particle lands 447 px to the right of the crack. The crack is at the right edge of the tank. The tank is 500 wide. So the particle lands 447 px to the right of the tank, which is just past the tank's right edge in horizontal distance.
    
    Hmm, but the tank's right edge is at TANK.x + TANK.w. The floor is at floorY. The particle goes from (TANK.x + TANK.w, crackY) to (TANK.x + TANK.w + 447, floorY). 
    
    Wait, the tank is at TANK.x = W*0.5 - TANK.w*0.55. So the tank's right edge is at TANK.x + TANK.w = W*0.5 + TANK.w*0.45. For TANK.w = 600, that's W*0.5 + 270.
    
    For W = 1920, TANK.x + TANK.w = 1230. The particle lands at 1230 + 447 = 1677. That's 243 px from the right wall (W = 1920). So the particle lands well within the room.
    
    OK so the jet arc is visible. Good.
    
    For a lower crack (smaller h to floor), the time of flight is shorter, horizontal distance is smaller. So a lower crack → particle lands closer to the tank. The user said "a lower crack should initially produce a stronger jet than a higher crack". Stronger jet means higher velocity, which means more horizontal distance. So lower crack → further horizontal distance.
    
    Hmm, but my calculation says lower crack → smaller h to floor → shorter flight time → smaller horizontal distance. So lower crack → jet falls closer to the tank.
    
    But the jet is also stronger (higher velocity). The "strongth" of the jet is its velocity. So lower crack → stronger (faster) jet that lands closer to the tank (because it falls less far).
    
    Hmm, that's counter-intuitive. Let me re-read the requirement: "A lower crack should initially produce a stronger jet than a higher crack."
    
    "Stronger" probably means more water flow (higher velocity, more particles). My model has:
    - velocity = sqrt(2*g*depth) where depth is from water surface to crack
    - particle emission proportional to sqrt(depth)
    - Both increase with depth (lower crack → larger depth → higher velocity and more particles)
    
    So lower crack → stronger jet (more water, faster). That's what the user wants.
    
    The horizontal distance: as I calculated, lower crack → particle lands closer to tank. This is because the particle has less time to travel horizontally (less vertical distance to fall).
    
    Actually wait, I think I confused myself. Let me re-derive.
    
    If the crack is lower, the depth from water surface to crack is larger, so the velocity is higher. But the height from crack to floor is smaller.
    
    Higher velocity → particle wants to go further horizontally
    Less time to fall → less horizontal distance
    
    These compete. Let's see which wins.
    
    For a crack at depth d1 from surface (higher crack), height h1 to floor.
    Velocity v1 = sqrt(2*g*d1), time of flight t1 = sqrt(2*h1/g), horizontal distance x1 = v1 * t1 = sqrt(2*g*d1) * sqrt(2*h1/g) = 2*sqrt(d1*h1).
    
    For a lower crack, d2 > d1, h2 < h1. The product d2*h2 could be larger or smaller.
    
    Hmm, let's say the water surface is at the top of the tank (TANK.y), and the bottom is at TANK.y + TANK.h. A crack at y = TANK.y + a (where a is from top). Then:
    d = waterTopY - (TANK.y + a) ≈ TANK.y + 22 - TANK.y - a = 22 - a (if water is at the top)
    h = TANK.y + TANK.h - (TANK.y + a) = TANK.h - a
    d*h = (22 - a) * (TANK.h - a)
    
    For TANK.h = 460:
    a = 100: d*h = -78 * 360 = -28080 (negative, not physical)
    a = 200: d*h = -178 * 260 = -46280
    a = 250: d*h = -228 * 210 = -47880
    
    All negative because the crack is below the water surface. Let me re-think.
    
    Actually, if a is measured from the top of the tank, and waterTopY = TANK.y + 22, then the depth d = waterTopY - crackY = TANK.y + 22 - TANK.y - a = 22 - a. If a > 22, then d < 0 (crack is below the water surface, but the water is above the crack by |d|). 
    
    Wait, I think I confused myself. Let me reset.
    
    In screen coords, y increases downward. WaterTopY is the y of the water surface (low value = top of water). The crack y is between TANK.y and TANK.y + TANK.h.
    
    If crackY < waterTopY, the crack is above the water surface (no water flowing).
    If crackY > waterTopY, the crack is below the water surface.
    
    Depth from water surface to crack = crackY - waterTopY. (positive when crack is below surface)
    
    In my code, I have:
    ```
    const depth = Math.max(0, mid - waterTopY);
    ```
    where mid = (crackTop + crackBot) / 2. So depth = crackMid - waterTopY. Yes, positive when crack is below surface.
    
    For a crack in the middle of the tank, depth ≈ TANK.h / 2 ≈ 230. Good.
    
    Velocity = sqrt(2*g*depth) = sqrt(2 * 1500 * 230) = sqrt(690000) = 831.
    
    Time of flight from crack to floor = sqrt(2 * h_to_floor / g) where h_to_floor = floorY - crackY.
    
    For a crack at TANK.y + TANK.h * 0.5 = TANK.y + 230, h_to_floor = floorY - TANK.y - 230 = (H - 100) - TANK.y - 230.
    
    With TANK.h = 460, TANK.y = H - 460 - 100 = H - 560. So h_to_floor = H - 100 - (H - 560) - 230 = 230.
    
    Time of flight = sqrt(2 * 230 / 1500) = sqrt(0.307) = 0.554 s.
    
    Horizontal distance = 831 * 0.554 = 460 px.
    
    For a lower crack at TANK.y + TANK.h * 0.8 = TANK.y + 368, h_to_floor = 92. depth = (TANK.y + 368 + 35) - (TANK.y + 22) = 381.
    
    Velocity = sqrt(2 * 1500 * 381) = sqrt(1143000) = 1069.
    Time of flight = sqrt(2 * 92 / 1500) = sqrt(0.123) = 0.35 s.
    Horizontal distance = 1069 * 0.35 = 374 px.
    
    So lower crack → larger velocity, but smaller horizontal distance. The jet is "stronger" (faster) but lands closer to the tank.
    
    For a higher crack at TANK.y + TANK.h * 0.3 = TANK.y + 138, h_to_floor = 322. depth = (TANK.y + 138 + 35) - (TANK.y + 22) = 151.
    
    Velocity = sqrt(2 * 1500 * 151) = sqrt(453000) = 673.
    Time of flight = sqrt(2 * 322 / 1500) = sqrt(0.429) = 0.655 s.
    Horizontal distance = 673 * 0.655 = 441 px.
    
    So:
    - Higher crack: v=673, x=441
    - Mid crack: v=831, x=460
    - Lower crack: v=1069, x=374
    
    Interesting. The horizontal distance peaks at the mid crack. Lower or higher reduces it. The velocity is monotonically increasing with depth.
    
    For the user, "stronger jet" probably means higher velocity. My model has that. So I'm good.

29. The current code is mostly correct. Let me make a few tweaks:
    a. Reduce water drain rate for longer drain
    b. Increase MAX_PARTICLES for denser jet
    c. Improve fish current handling
    d. Maybe add a few visual improvements

Let me update the code.

Actually, let me also think about what the user sees:
- At trigger: crack widens, shards fly
- Water starts flowing out
- Jet is visible
- Fish are swept
- Puddle grows
- Tank drains

I want the visual to be impressive. Let me add:
- A slight glow at the crack
- More dramatic water jet
- Bigger puddle
- Maybe some screen effects

Let me also check the waterline visibility. The water has a "ripple" line at the top. As the water drains, this line moves down. Good.

Let me also think about the fish being "swept through the breach". The fish needs to be in the crack zone (y between crackTop and crackBot) to be ejected. The fish swims left (against current), but the current pushes it right. The fish needs to be in the crack zone to be ejected.

If a fish is at the top of the tank (y < crackTop), it can't be ejected (the crack is below it). It just gets pushed right at the top.

But the crack zone is from crackTop to crackBot. The fish needs to be in this zone. As the water drains, the fish stays at the water surface (which is also dropping). Eventually, the water surface reaches the crack zone, and the fish is swept through.

Hmm, but the fish might also be at lower y (deeper in the tank). It could be at y = TANK.y + TANK.h - 50 (near the bottom). It wouldn't be in the crack zone until the water drains below it.

Actually, the fish can be at any y in the water. The crack zone is fixed. As the water drains, the fish stays at its current y. If the fish is in the crack zone, it can be ejected.

OK I think the logic is correct. Let me just verify the code runs.

Let me also think about an edge case: what if the crack is dragged to a position above the water surface? Then the crack is not in the water, and no water flows. The fish in the crack zone (at the crack y) won't be ejected because... actually they would, because the ejection logic doesn't check water level.

Let me add a check: only eject if waterTopY < crackBot. If waterTopY > crackBot, the crack is above the water and fish can't be ejected.

Actually wait, my updateWater stops the simulation when waterTopY >= crackBot. So when waterTopY = crackBot, the simulation ends. Fish can still be ejected as long as waterTopY < crackBot.

In my updateFish, I check:
```
if (TANK.failed && f.y > TANK.crackTop - 4 && f.y < TANK.crackBot + 4) {
  // ejected!
  ...
}
```

This doesn't check waterTopY. So if the crack is above the water, the fish can still be ejected (which is wrong - there's no water flowing out).

Let me add the check:
```
if (TANK.failed && waterTopY < TANK.crackBot + 4 && f.y > TANK.crackTop - 4 && f.y < TANK.crackBot + 4) {
  // ejected
  ...
}
```

Hmm wait, but at the start, the water level is high and the crack is at some position. The fish in the crack zone can be ejected. That's correct.

If the crack is dragged to a position above the water, then... hmm, but the user can only drag the crack within the tank. The water level is at the top of the tank. The crack can be anywhere from TANK.y + 30 to TANK.y + TANK.h - 75. So the crack can be above the water level (which is at TANK.y + 22).

Wait, the water level is at TANK.y + 22, and the crack's top can be at TANK.y + 30. So the crack can be entirely below the water level. Actually, TANK.y + 30 is below TANK.y + 22? No, in screen coords, larger y = lower position. So TANK.y + 30 is below TANK.y + 22.

Wait, TANK.y + 30 vs TANK.y + 22. 30 > 22, so TANK.y + 30 is below TANK.y + 22. So the crack is always below the water surface (initially).

The crackBot can be up to TANK.y + TANK.h - 20. For TANK.h = 460, that's TANK.y + 440. The water is at TANK.y + 22. The crackBot is 418 below the water surface. So there's always water above the crack.

Hmm, but as the water drains, the waterTopY increases. If the crack is high up (TANK.y + 30 to TANK.y + 100), the water drains past it quickly. Then no more water flows out.

OK so the model works. Let me just make sure the fish ejection only happens when the crack is in the water.

Let me update the code:
1. Slow down water drain
2. Improve fish ejection check
3. Maybe other tweaks

Let me also make the puddle a bit more impressive. Currently it caps at 18 px height. Let me make it larger.

Also, I want to add a few more visual touches:
- Light reflection on the water surface
- Bubbles in the water
- Slight wobble of the tank before failure

Let me also add a slight screen shake during the failure.

OK let me make these changes. Let me read the current file structure and make targeted edits.

Now let me test the file by reading the rest and identifying improvements:

→ read {"path":"/tmp/ws/index.html","offset":820,"limit":120}

toolResult

t.vy *= Math.pow(0.5, AIR_DRAG * dt); t.x += t.vx * dt; t.y += t.vy * dt; t.bobPhase += dt * 6; if (t.y >= floorY() - 4) { t.y = floorY() - 4; t.vy = -t.vy * 0.3; t.vx *= 0.6; if (Math.abs(t.vy) < 25) { t.vy = 0; t.onFloor = true; } } if (t.onFloor) { t.vx *= Math.pow(0.5, 2 * dt); if (Math.abs(t.vx) < 3) t.vx = 0; } return; } // floats at water surface if (waterTopY < TANK.y + TANK.h - 4) { t.y = waterTopY - t.size * 0.6; } else { t.y = TANK.y + TANK.h - t.size * 0.6; } t.bobPhase += dt * 3.2; // surface current if (TANK.failed) { const c = currentAt(t.x, t.y); t.vx += c * 90 * dt; } t.vx *= Math.pow(0.5, 2.5 * dt); t.x += t.vx * dt; // bounds if (t.x < TANK.x + 8) { t.x = TANK.x + 8; t.vx = Math.abs(t.vx); } if (t.x > TANK.x + TANK.w - 6) { t.x = TANK.x + TANK.w - 6; if (TANK.failed && t.y > TANK.crackTop - 6 && t.y < TANK.crackBot + 6) { t.ejected = true; t.vx = Math.max(200, currentAt(t.x, t.y) * 100) + 60; t.vy = -120 - Math.random() * 80; } else { t.vx = -Math.abs(t.vx); } } } // ============================================================= // Shards update // ============================================================= function updateShards(dt) { for (let i = shards.length - 1; i >= 0; i--) { const s = shards[i]; s.vy += GRAVITY * dt; s.vx *= Math.pow(0.5, 0.6 * dt); s.vy *= Math.pow(0.5, 0.6 * dt); s.x += s.vx * dt; s.y += s.vy * dt; s.angle += s.angVel * dt; s.angVel *= Math.pow(0.5, 1.2 * dt); if (s.y >= floorY() - 2) { s.y = floorY() - 2; s.vy = -s.vy * 0.25; s.vx *= 0.55; s.angVel *= 0.55; s.resting += dt; if (Math.abs(s.vy) < 25) { s.vy = 0; s.onFloor = true; } } if (s.x < 0 || s.x > W + 10) { shards.splice(i, 1); continue; } if (s.onFloor && Math.abs(s.vx) < 5 && Math.abs(s.vy) < 5) s.vx = 0; } } // ============================================================= // Bubbles (ambient) // ============================================================= function updateBubbles(dt) { for (const b of bubbles) { b.wob += dt * 2; b.y -= b.speed * dt; b.x += Math.sin(b.wob) * 6 * dt; if (b.y < waterTopY) { // bubble pops at surface b.y = TANK.y + TANK.h - 8; b.x = TANK.x + 18 + Math.random() * (TANK.w - 36); } } } // ============================================================= // Rendering — Room // ============================================================= function drawRoom() { // wall background gradient const wallGrad = ctx.createLinearGradient(0, 0, 0, H); wallGrad.addColorStop(0, '#1d120a'); wallGrad.addColorStop(0.6, '#261a10'); wallGrad.addColorStop(1, '#1a0f08'); ctx.fillStyle = wallGrad; ctx.fillRect(0, 0, W, H); // wall paneling ctx.fillStyle = '#1a1008'; ctx.fillRect(0, 0, 70, H); ctx.fillRect(W - 70, 0, 70, H); ctx.fillStyle = '#221710'; ctx.fillRect(70, 0, 8, H); ctx.fillRect(W - 78, 0, 8, H); // paneling grooves ctx.strokeStyle = 'rgba(0,0,0,0.4)'; ctx.lineWidth = 1; for (let x = 0; x < 70; x += 18) { ctx.beginPath(); ctx.moveTo(x, 0); ctx.lineTo(x, H); ctx.stroke(); } for (let x = W - 70; x < W; x += 18) { ctx.beginPath(); ctx.moveTo(x, 0); ctx.lineTo(x, H); ctx.stroke(); } // window on the left (between wall and tank) drawWindow(); // picture frame on right [831 more lines in file. Use offset=940 to continue.]

assistant

thinking

The code structure looks good. Let me now make targeted improvements to fix timing and a few other issues:

1. Slow down water drain (constant 0.0042 → 0.0005)
2. Make current strength depth-dependent
3. Fix fish ejection to only happen when water is above crack
4. Adjust particle emission rate

Let me make these edits.

Now let me make some important improvements to the timing and physics:

→ edit

{"path":"/tmp/ws/index.html","edits":[{"oldText":"const GRAVITY        = 1500;     // px / s²\nconst AIR_DRAG       = 0.45;\nconst WATER_DRA

toolResult

Successfully replaced 4 block(s) in /tmp/ws/index.html.

assistant

thinking

Now let me improve the fish behavior so they really attempt to swim against the current. The current code has some issues - the panic multiplies the current force, which is weird. Let me redo it so the fish swim force always opposes the current.

→ edit

{"path":"/tmp/ws/index.html","edits":[{"oldText":"  // in-water motion\n  f.age += dt;\n\n  // swim: pick a target (left for safety, or wand

toolResult

Successfully replaced 1 block(s) in /tmp/ws/index.html.

assistant

thinking

Now let me also improve the toy ejection logic to check that water is above the crack, and a few other improvements.

Also, I want to make the puddle spread more visible. And the fish getting "stuck" against the right wall before being ejected.

Let me also fix the toy to make sure it gets ejected when it reaches the crack. The toy's y is waterTopY - t.size * 0.6. As waterTopY drops to crackTop, the toy is at crackTop. The toy should get ejected.

But in my current code:
```
if (t.x > TANK.x + TANK.w - 6) {
  t.x = TANK.x + TANK.w - 6;
  if (TANK.failed && t.y > TANK.crackTop - 6 && t.y < TANK.crackBot + 6) {
    t.ejected = true;
    ...
  }
}
```

The check `t.y > TANK.crackTop - 6 && t.y < TANK.crackBot + 6` means the toy is within 6px of the crack vertically. When the water level is at the crack, the toy is at the crack. So this should work.

But there's an issue: the toy's y = waterTopY - 10.8. When waterTopY = crackTop, toy.y = crackTop - 10.8. Is this in the crack zone? crackTop - 6 to crackBot + 6. The toy is at crackTop - 10.8, which is below crackTop - 6. So the toy is NOT in the crack zone yet.

The toy needs to be lower (waterTopY higher) to be in the crack zone. Specifically, waterTopY needs to be at least crackTop + 4.8 for the toy to be in the crack zone (toy.y = crackTop + 4.8 - 10.8 = crackTop - 6, which is the boundary).

Hmm, the toy is at the water surface. The crack is below the water surface (initially). As the water drains, the surface drops. When the surface is just above the crack, the toy is just above the crack. The toy is at the water surface, which is above the crack, so the toy is above the crack.

Wait, I'm confusing myself with coordinates. Let me re-think.

In screen coords, y increases downward. crackTop < crackBot. The crack is a vertical segment from crackTop to crackBot. Above the crack (smaller y) is the upper part of the tank, below the crack (larger y) is the lower part of the tank.

The water surface is at waterTopY. Initially, waterTopY is small (near the top of the tank). As water drains, waterTopY increases.

For water to flow out, waterTopY must be < crackBot (water surface above the bottom of the crack).

The toy floats at waterTopY - t.size * 0.6 = waterTopY - 10.2 (for size 17). So the toy is above the water surface by 10.2 pixels.

Wait, the toy floats ON the water, not above it. The y of the toy's center is the water surface minus some amount. So the toy's center is at waterTopY - 10.2. The toy's bottom is at waterTopY - 10.2 + 17*0.7 = waterTopY + 1.7. So the toy's bottom is just below the water surface.

OK so the toy is roughly at the water surface. As waterTopY increases, the toy follows.

When is the toy "at the crack"? The toy is at the crack when its y is in the crack range [crackTop, crackBot]. Specifically, the toy's y is between crackTop - 4 and crackBot + 4 (with my check).

For the toy's y to be in this range, waterTopY - 10.2 should be in [crackTop - 4, crackBot + 4]. So waterTopY in [crackTop + 6.2, crackBot + 14.2].

Hmm, so the toy needs the water level to drop past crackTop + 6.2 before it's in the crack zone.

OK that's fine. The toy gets ejected when the water level is just above the crack bottom. The toy has been swept to the right side by the current.

Let me also add a check: the toy should only be ejected if the water is still above the crack.

Let me also think about the toy's x position. The toy starts at TANK.x + TANK.w * 0.35. The current pushes it right. When it reaches TANK.x + TANK.w - 6, it's at the right wall. Then the check is made.

But wait, the current is strongest at the right side. So the toy is pushed right quickly. It will reach the right wall in a few seconds.

OK the logic is correct. Let me also make sure the toy's ejection happens when water is above the crack. Let me update.

Actually wait, looking at my code more carefully:

```
if (t.x > TANK.x + TANK.w - 6) {
  t.x = TANK.x + TANK.w - 6;
  if (TANK.failed && t.y > TANK.crackTop - 6 && t.y < TANK.crackBot + 6) {
    t.ejected = true;
    ...
```

This is in the "not ejected" branch. So the toy is checked when it's at the right wall. If it's also in the crack zone, it gets ejected.

The check `t.y > TANK.crackTop - 6 && t.y < TANK.crackBot + 6` checks if the toy is in the crack zone vertically. The toy's y is waterTopY - 10.2. As waterTopY drops past crackTop, the toy is at the crack level.

But the toy might be ejected before waterTopY reaches the crack. Let me think...

If the toy is at the right wall, and the current is strong, the toy should be pushed through the crack. But the toy's y might still be above the crack (waterTopY < crackTop). In that case, the toy is at the right wall but above the crack, and my check fails (t.y < crackTop - 6). So the toy is not ejected, just bounces off the right wall.

When waterTopY drops to crackTop, the toy is at crackTop. The check `t.y > crackTop - 6` becomes true (toy is just above the crack). Wait, t.y = waterTopY - 10.2. If waterTopY = crackTop, t.y = crackTop - 10.2, which is less than crackTop - 6. So the check fails.

When waterTopY = crackTop + 4.2, t.y = crackTop - 6. The check `t.y > crackTop - 6` is true (t.y = crackTop - 6 > crackTop - 6 is false). Actually it's t.y > crackTop - 6, so t.y must be strictly greater than crackTop - 6.

Hmm let me re-read: `t.y > TANK.crackTop - 6`. If t.y = crackTop - 6, then t.y > crackTop - 6 is false. So we need t.y > crackTop - 6.

t.y = waterTopY - 10.2. So waterTopY - 10.2 > crackTop - 6 → waterTopY > crackTop + 4.2.

So the toy is in the crack zone when waterTopY > crackTop + 4.2. The toy gets ejected when waterTopY is just past crackTop.

But the toy might already be in the crack zone at waterTopY = crackTop. Wait, let me re-check.

t.y = waterTopY - 10.2. At waterTopY = crackTop, t.y = crackTop - 10.2.
crackTop - 10.2 > crackTop - 6? -10.2 > -6? No, false.
crackTop - 10.2 < crackTop + 6? -10.2 < 6? Yes, true.

So at waterTopY = crackTop, t.y is in [crackTop - 6, crackTop + 6] partially. Specifically, t.y < crackTop - 6 is false (t.y is just below crackTop - 6). t.y < crackTop + 6 is true.

So `t.y > crackTop - 6 && t.y < crackBot + 6` → t.y < crackBot + 6 is true, but t.y > crackTop - 6 is false. So the check fails at waterTopY = crackTop.

The check passes when t.y > crackTop - 6, i.e., when waterTopY > crackTop + 4.2.

So the toy is in the crack zone (and gets ejected) when waterTopY is just past crackTop.

OK that works. The toy follows the water level down, and when the water is just below crackTop, the toy is at the crack and gets pushed out.

But wait, if waterTopY is between crackTop and crackBot, the toy is at the water level, which is inside the crack zone. The water is also flowing out of the crack. The toy is at the surface, in the crack. It gets pushed out by the current.

OK this is correct. Let me move on.

Let me also check the toy's velocity when ejected:
```
t.vx = Math.max(200, currentAt(t.x, t.y) * 100) + 60;
```

With current ~ 2.4, that's 240 + 60 = 300. The toy flies out at 300 px/s. With gravity 1500, the toy will fly for a while before landing. Time to peak: 120/1500 = 0.08s. Time to fall back to floor: depends on starting height. Hmm, the toy starts at crack level (height = floorY - crackY above floor). With initial vy = -120, the toy rises then falls.

Let me calculate: toy at y = waterTopY - 10.2, vy = -120. Time to peak: 120/1500 = 0.08s. Peak height: 120*0.08 - 0.5*1500*0.08^2 = 9.6 - 4.8 = 4.8 above start. Then it falls. Total time to fall to floor: depends on initial height. Let's say toy at floorY - 100, peak at floorY - 95.2, then falls. Time to fall 95.2 pixels: 0.5*1500*t^2 = 95.2 → t = sqrt(0.127) = 0.356s. Total time: 0.08 + 0.356 = 0.44s. Horizontal distance: 300 * 0.44 = 132 px. So the toy lands 132 px to the right of the crack. Reasonable.

OK the physics is fine. Let me also do some visual improvements.

Let me improve the splash effect when water hits the floor. Currently the splash is just small droplets. Let me add a more visible splash.

Also, let me make the jet look more dramatic. The jet is currently a fill of a polygon. Let me add a glow effect.

Let me also add a "wet floor" effect near the tank where water has been.

OK let me make these changes.

Actually, I realize the puddle might have an issue. When the particle lands, it adds to the puddle cell. But the puddle cell might be far from the tank if the particle lands far away. Let me check.

The puddle is on the floor. Particles that reach y >= floorY() add to the puddle. The x position of the particle determines the puddle cell.

For a particle ejected at high velocity, it lands far from the tank. The puddle cell is at the landing x. Good.

For a particle with low velocity (low crack), it lands close to the tank. The puddle cell is close to the tank. Good.

OK the puddle is correct.

Let me also think about the crack visibility. The crack is drawn as a thin black line with side branches. When the user hovers over the crack, the cursor changes. Good.

Let me also think about the visual feedback for "Trigger Failure". The button is red. The status text changes. The camera shakes. Good.

Let me make a few more visual improvements:
1. Add a glow around the breach
2. Make the jet more dramatic
3. Add a wet floor effect
4. Make the fish eye more visible
5. Add more variation to fish

Let me also think about the visual order:
- Room
- Cabinet (under tank)
- Tank (back, water, objects, frame, glass)
- Crack (on tank, breach)
- Puddle (on floor, in front of cabinet)
- Jet (in front of puddle, coming from breach)
- Shards (flying, in front)
- Ejected objects (in front)
- Foreground effects

I think the order is good. Let me also make sure the wet floor is visible.

Let me look at the current rendering code to see what's there.

Let me also improve a few visual effects and make the splash more impressive:

→ read {"path":"/tmp/ws/index.html","offset":1100,"limit":100}

toolResult

// ============================================================= function drawTank() { // sand at bottom const sandGrad = ctx.createLinearGradient(0, TANK.y + TANK.h - 18, 0, TANK.y + TANK.h); sandGrad.addColorStop(0, '#8a6840'); sandGrad.addColorStop(1, '#5a4022'); ctx.fillStyle = sandGrad; ctx.fillRect(TANK.x + 2, TANK.y + TANK.h - 14, TANK.w - 4, 14); // sand speckle ctx.fillStyle = 'rgba(40,20,10,0.4)'; for (let i = 0; i < 30; i++) { const sx = TANK.x + 4 + ((i * 37) % (TANK.w - 8)); const sy = TANK.y + TANK.h - 4 - ((i * 11) % 8); ctx.fillRect(sx, sy, 1.2, 1.2); } // water if (waterTopY < TANK.y + TANK.h - 2) { const wTop = Math.max(TANK.y + 1, waterTopY); const wBot = TANK.y + TANK.h; const wH = wBot - wTop; const wGrad = ctx.createLinearGradient(0, wTop, 0, wBot); wGrad.addColorStop(0, 'rgba(70,150,200,0.88)'); wGrad.addColorStop(0.4, 'rgba(40,100,150,0.92)'); wGrad.addColorStop(1, 'rgba(20,55,90,0.95)'); ctx.fillStyle = wGrad; ctx.fillRect(TANK.x + 3, wTop, TANK.w - 6, wH); // light shafts ctx.save(); ctx.globalCompositeOperation = 'lighter'; for (let i = 0; i < 4; i++) { const lx = TANK.x + 40 + i * (TANK.w - 80) / 3; const shaftGrad = ctx.createLinearGradient(lx, wTop, lx + 30, wBot); shaftGrad.addColorStop(0, 'rgba(180,220,240,0.12)'); shaftGrad.addColorStop(1, 'rgba(180,220,240,0)'); ctx.fillStyle = shaftGrad; ctx.beginPath(); ctx.moveTo(lx, wTop); ctx.lineTo(lx + 30, wTop); ctx.lineTo(lx + 60, wBot); ctx.lineTo(lx + 20, wBot); ctx.closePath(); ctx.fill(); } ctx.restore(); // waterline highlight (the visible waterline that lowers) ctx.fillStyle = 'rgba(200,235,250,0.55)'; ctx.fillRect(TANK.x + 3, wTop - 1, TANK.w - 6, 2); // surface ripples ctx.strokeStyle = 'rgba(220,245,255,0.7)'; ctx.lineWidth = 1; ctx.beginPath(); for (let x = TANK.x + 3; x <= TANK.x + TANK.w - 3; x += 6) { const y = wTop + Math.sin((x + elapsed * 60) * 0.06) * 1.3; if (x === TANK.x + 3) ctx.moveTo(x, y); else ctx.lineTo(x, y); } ctx.stroke(); // surface shimmer ctx.fillStyle = 'rgba(255,255,255,0.08)'; ctx.fillRect(TANK.x + 3, wTop, TANK.w - 6, 1); // bubbles ctx.fillStyle = 'rgba(220,240,250,0.7)'; ctx.strokeStyle = 'rgba(255,255,255,0.4)'; ctx.lineWidth = 0.7; for (const b of bubbles) { ctx.beginPath(); ctx.arc(b.x, b.y, b.r, 0, Math.PI * 2); ctx.fill(); ctx.stroke(); } // caustics on sand ctx.save(); ctx.globalCompositeOperation = 'lighter'; ctx.fillStyle = 'rgba(150,210,230,0.12)'; for (let i = 0; i < 5; i++) { const cx = TANK.x + 30 + i * (TANK.w - 60) / 4 + Math.sin(elapsed + i) * 8; const cy = TANK.y + TANK.h - 8; ctx.beginPath(); ctx.ellipse(cx, cy, 20, 3, 0, 0, Math.PI * 2); ctx.fill(); } ctx.restore(); } // objects in tank // rocks (drawn first / behind) for (const r of rocks) drawRock(r); // plants for (const pl of plants) drawPlant(pl); // fish for (const f of fishes) if (!f.ejected) drawFish(f); // toys for (const t of toys) if (!t.ejected) drawToy(t); // glass tint & edges ctx.fillStyle = 'rgba(160,210,225,0.05)'; [576 more lines in file. Use offset=1200 to continue.]

assistant

thinking

Now let me look at the drawCrack and add a glow at the breach. Let me also add a "wet trail" on the floor where the jet hits.

Actually, let me first verify the simulation runs correctly by checking a few key parts. Let me also think about whether the fish are properly drawn when airborne.

Looking at drawEjectedObjects, I see I'm calling drawFish(f) and drawToy(t) for ejected objects. The drawFish and drawToy functions use ctx.save/restore, so they should be fine.

But wait, the drawFish function uses f.facing to determine direction. When airborne, the fish is moving right (positive vx), so facing should be 1 (right). But the fish's facing was set when in water. If the fish was facing left (swimming against current), then when ejected, it's facing left but moving right. That looks weird.

Let me fix the fish to face the direction of motion when airborne. Actually, I'll just leave it - the fish tumbles in the air due to angVel, so the orientation is mostly random.

Let me also check the shard rendering. The shards are small rectangles with rotation. They have an angle and angVel. When on floor, they settle. Good.

OK let me also make the breach look more dramatic. The breach should glow slightly from the water pressure. Let me add a glow.

And let me add a few more visual touches:
- Wet floor trail
- More dramatic splash

Let me make these edits.

Now let me improve the breach appearance with a glow effect and enhance the splash on the floor:

→ edit

{"path":"/tmp/ws/index.html","edits":[{"oldText":"  if (!TANK.failed) return;\n  // After trigger: breach — dark gap on right edge\n  ctx.sa

toolResult

Successfully replaced 1 block(s) in /tmp/ws/index.html.

assistant

thinking

Now let me also improve the splash effect when water hits the floor, and add a wet floor effect.

Let me find the splash rendering code:

→ read {"path":"/tmp/ws/index.html","offset":1530,"limit":60}

toolResult

if (jetParticles.length < 2) return; // Sort by life (older particles further from source) // Find path centerline by binning x const bins = {}; for (const p of jetParticles) { const b = Math.floor(p.x / 8); if (!bins[b]) bins[b] = { sumY: 0, count: 0, top: -1e9, bot: 1e9 }; bins[b].sumY += p.y; bins[b].count++; if (p.y < bins[b].top) bins[b].top = p.y; if (p.y > bins[b].bot) bins[b].bot = p.y; } const xs = Object.keys(bins).map(Number).sort((a, b) => a - b); if (xs.length < 2) return; // outer surface (top and bottom) of jet ctx.save(); // Build top/bottom polylines const top = [], bot = []; for (const bx of xs) { const b = bins[bx]; const cx = bx * 8 + 4; top.push({ x: cx, y: b.top }); bot.push({ x: cx, y: b.bot }); } // Fill const fillGrad = ctx.createLinearGradient(0, TANK.crackTop, 0, floorY()); fillGrad.addColorStop(0, 'rgba(120,200,235,0.85)'); fillGrad.addColorStop(0.6, 'rgba(80,160,210,0.7)'); fillGrad.addColorStop(1, 'rgba(40,110,160,0.55)'); ctx.fillStyle = fillGrad; ctx.beginPath(); ctx.moveTo(top[0].x, top[0].y); for (let i = 1; i < top.length; i++) ctx.lineTo(top[i].x, top[i].y); for (let i = bot.length - 1; i >= 0; i--) ctx.lineTo(bot[i].x, bot[i].y); ctx.closePath(); ctx.fill(); // outline highlight on top ctx.strokeStyle = 'rgba(220,245,255,0.7)'; ctx.lineWidth = 1.2; ctx.beginPath(); for (let i = 0; i < top.length; i++) { if (i === 0) ctx.moveTo(top[i].x, top[i].y); else ctx.lineTo(top[i].x, top[i].y); } ctx.stroke(); // Draw individual particles for (const p of jetParticles) { if (p.onFloor) continue; const a = Math.min(1, p.life / 3); ctx.fillStyle = `rgba(180,225,245,${0.5 * a})`; ctx.beginPath(); ctx.arc(p.x, p.y, p.size, 0, Math.PI * 2); ctx.fill(); } // mist for (const p of particles) { [193 more lines in file. Use offset=1590 to continue.]

assistant

→ edit

{"path":"/tmp/ws/index.html","edits":[{"oldText":"  // splash droplets\n  for (const s of splash) {\n    ctx.fillStyle = 'rgba(180,225,245,0

toolResult

Successfully replaced 1 block(s) in /tmp/ws/index.html.

TAKE IT TO CODE

A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.

RUN

modelminimax-m3

vendorMiniMax

harnesspi-agent

generated2026-08-02

EVALUATION

★★★★★ 1/5 broken

Only a small text panel with a control box renders; the actual aquarium canvas appears blank in all frames.

off-prompt

Vision grade · anthropic/claude-sonnet-5

MEASUREMENTS

Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.

idle motion0.0%

on click0.0%

on drag0.0%

on wheel0.0%

on enter + space0.0%

on arrow keys0.0%

on w/a/s/d0.0%

frame spread8.9 / 255

console errors0

js errors none

METRICS

runtime600.0s

tokens in82k

tokens out69k

cached906k

cost / run$0.1614