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"content": "Here's the plan for the simulation:\n\n- **Volcano**: a dark basalt cone drawn as a filled polygon with a crater notch, stratified shading, and an inner glowing crater mouth. Ground plane and gradient sky behind it.\n- **Pressure system**: pressure climbs steadily toward 100%; when full, an eruption fires lava bombs + ash burst, then pressure drops and slowly rebuilds for the next cycle.\n- **Lava physics**: particles get varied velocity from the crater, follow gravity with air drag, collide against the slope (a heightfield function of x), bounce/roll downhill proportional to local slope, cool through a color ramp (white-hot \u2192 yellow \u2192 orange \u2192 red \u2192 dark rock \u2192 fade), and are removed once cold and nearly still.\n- **Ash**: soft smoke puffs spawning at the crater, buoyant upward drift plus horizontal wind, expanding radius, fading alpha.\n- **Sliders**: eruption power, wind (negative = left, positive = right), and particle budget per eruption \u2014 all live.\n- **HUD**: live active-particle count and FPS via frame timing; particle-cap logic keeps the frame budget smooth well above 1000 particles.\n\n```html\n\n\n\n\nVolcano \u2014 Pressure Cycles\n\n\n\n\n
\n
CONTROLS
\n
ERUPTION POWER
\n \n
WIND \u2190 / \u2192
\n \n
PARTICLE AMOUNT
\n \n
\n
0 particles 0 fps
\n
PRESSURE
\n\n\n\n\n```\n\n**How it works:**\n\n- **Pressure meter**: pressure rises ~1.4%/s; at 100% the meter flashes full and an eruption triggers, firing `s3.value` particles over ~1.5s at velocity scaled by the power slider. Pressure resets and rebuilds.\n- **Lava arcs & slopes**: particles fly with gravity, then a heightfield `slopeH(x)` supplies collision. Local slope normal is used to reflect velocity (damped bounce) plus a downhill tangential push, so bombs land on the cone and roll/slide down the flanks, settling or cooling out.\n- **Cooling ramp**: `heat` decays per-second through a 7-stop palette (white-hot \u2192 yellow \u2192 orange \u2192 red \u2192 dark rock) with additive-blend halos for the hottest particles.\n- **Ash**: crater-spawned puffs with buoyant upward drift and horizontal wind coupling, expanding radius and fading alpha, drifting with the wind slider's sign.\n- **Performance**: fixed-pool arrays with swap-remove (zero allocation per frame), a 2200 lava cap and 600 ash cap, single canvas pass per layer \u2014 comfortably smooth past 1000 live particles on typical machines.",
"reasoning_content": "Explain plan briefly, then give complete HTML file with all pieces included, ending with a short recap after the code."
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