TITLE: LUMEN CAVERNS — an explorable crystal cave
PROMPT: Design 'LUMEN CAVERNS', an explorable crystal cave. Dark stone rendered from layered gradients and subtle noise polygons; clusters of luminous crystals (SVG polygons with internal glow, refraction facets that shimmer slowly) in cyan, violet, and mint; drifting spores of light; occasional deep water ripple reflections at the floor. Interactions: the cursor is a lantern — light radius follows it, revealing crystal colors and casting soft moving shadows; clicking a crystal chimes a pure tone (WebAudio pentatonic, gesture-gated) and intensifies its glow for a while; a deep-breathe button dims everything except the nearest cluster. Ancient, hushed, luminous.
DESCRIPTION: A full-viewport cavern built from seeded noise: four strata of jagged stone silhouettes, scattered rock-chip polygons, and ten clusters of faceted SVG crystals in cyan, violet, and mint. Darkness veils everything until your cursor — a warm, gently-eased lantern — reveals what is near: crystal facets fill with color, glow circles bloom, and outlines sharpen out of the dark. Drifting spores of light brighten as they pass the lantern; slow elliptical ripples cross a black pool along the floor. Clicking a crystal flares its glow and hums a pure pentatonic tone (its cluster neighbors catch the light); DEEP BREATHE plunges the cave into near-dark, isolating the nearest cluster for six seconds; RELEASE SPORES breathes a swirl of new motes from the lantern. Rotating whispers anchor the hush.
TECHNIQUES: LCG seeded PRNG for reproducible geology, procedural SVG crystal shard paths (fan of tapered quadrilaterals), per-frame radial-gradient darkness veil with lantern cut-out in 'lighter' composite, eased lantern follow, canvas spores with proximity-brightened alpha, ellipse ripples with fading rings, glow + facet opacity shimmer via per-crystal phase, WebAudio dual-oscillator sine chimes with detuned beating partial and 2.2 s exponential decay (gesture-gated, OFF by default), rebuild-on-resize, prefers-reduced-motion snaps lantern and freezes drift.
INTERACTION: Move the pointer to carry the lantern (a small ember tip replaces the cursor). Tap/click any crystal to flare it and chime its note — enable CHIMES first for sound. DEEP BREATHE dims the world to the nearest cluster; RELEASE SPORES seeds the air with light. Works from 360 px phones (touch-drag the lantern) to 4 K walls.