• 01 - CSS: Insects
  • 02 - Critter Models 02
  • 03 - VantaJS Shaders
  • 04 - App Bundle 02
  • 05 - Cathedrals
  • 06 - Board Games
  • 07 - App Bundle 01
  • 08 - Retroscopic
  • 09 - Games 26
  • 10 - Voronoi
  • 11 - Terrain
  • 12 - Critter Models 01
  • 13 - Chromatophores
  • 14 - Conformal Maps
  • 15 - Echo Logix
  • 16 - Music 26
  • 17 - Colour Theory
ARCHIVE
Notes
Number:
Project:
01CSS: Insects
└ CSS Beetle└ CSS Ladybird└ CSS Bluebottle└ CSS Dragonfly
02Critter Models 02
└ Locust└ Butterfly└ Cockroach└ Spider└ Scorpion└ Dragon└ Brazilian Treehopper└ Tardigrade└ Diatoms└ Bumblebee└ Wasp└ Hammerhead Worm└ Giraffe Weevil└ Trilobite Beetle
03VantaJS Shaders
└ Clouds└ Waves└ Cells└ Rings└ Halo└ Globe└ Net└ Dots└ Birds└ Trunk└ Topology└ About VantaJS
04App Bundle 02
└ OwnZones└ Gutindex└ OpenLayers└ SH-101└ Pip└ Great White
05Cathedrals
└ Lattice└ Lost└ Lucent└ Lumen└ Glass└ Disco└ Hyperion└ Latent
06Board Games
└ Chess└ Carrom└ Connect 4
07App Bundle 01
└ Robohash└ PrismJS└ Horoscope└ Binary Jazz└ Morse Code└ URL Extractor└ Entity Escaper└ Phonetic Alphabet└ Toki Pona└ Semaphore└ Cut Up Machine└ Text Mixer└ Currency Freaks└ Host IO└ CrUX API└ Logo Dev└ Web Speech API└ GEO DB
01 / 03

CSS BEETLE - THREEJS PROCEDURAL ANIMATION SOURCE CODE

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
<title>CSS Beetle</title>
<style>
/* =====================================================================
   1. TYPED CUSTOM PROPERTIES
   Registering these lets the browser animate and transition plain numbers
   and angles. Every moving part reads from them, so a single keyframe on
   one element can drive the legs, wings and lighting all at once.
   ===================================================================== */
@property --heading { syntax: "<angle>";  inherits: true; initial-value: 0deg; }
@property --shimmer { syntax: "<angle>";  inherits: true; initial-value: 0deg; }
@property --walk    { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --open    { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --sense   { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --lift    { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --alert   { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --stride  { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --fold    { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --sway    { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --bob     { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --flap    { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --twitch  { syntax: "<number>"; inherits: true; initial-value: 0; }
@property --chew    { syntax: "<number>"; inherits: true; initial-value: 0; }

/* =====================================================================
   2. TOKENS (day by default, night from the system or viewer setting)
   ===================================================================== */
:root {
  /* One unit scales the whole beetle: 0.8px on phones, up to 1.5px on desktop */
  --u: clamp(0.8px, 0.18vmin, 1.5px);
  /* Leaf size. On near-square screens vmax alone makes the leaf too narrow,
     so it never drops below 175vmin. */
  --ls: max(112vmax, 175vmin);
  /* Half the leaf's width at its middle: the lens is 0.2929x its square */
  --leaf-half: calc(var(--ls) * .2929);
  /* Patrol radius: the smallest of a comfortable size, what fits on screen,
     and what keeps the beetle's legs and antennae on the leaf */
  --R: min(calc(var(--u) * 165),
           calc(50vmin - var(--u) * 90),
           calc(var(--leaf-half) - var(--u) * 112 - 12px));
  --gait: .62s;
  --cycle: 26s;

  /* Structural colour of the shell: a full turn of hues the conic gradients sample from */
  --iri: #0b6b3a 0%, #19a457 14%, #8ccf3c 25%, #e0c341 33%, #31b56a 43%,
         #0e8d7e 55%, #2166c4 65%, #6a43b8 72%, #12955c 85%, #0b6b3a 100%;

  --bg-deep: #0f2410;
  --bg-mid: #2a5a22;
  --bok: rgba(225, 255, 170, .2);
  --leaf-edge: #3f7d2b;
  --leaf-core: #7cbf4e;
  --leaf-rib: #cfe9a0;
  --rib-hi: #f3ffd9;
  --leaf-rim: rgba(215, 245, 160, .3);
  --vein: rgba(232, 252, 192, .26);
  --vein-fine: rgba(25, 70, 15, .03);
  --cast: rgba(10, 34, 6, .5);
  --key: rgba(255, 244, 205, .55);
  --fill: rgba(0, 20, 0, .5);
  --vig: rgba(5, 18, 4, .55);
  --dapple-o: .75;
  --night-o: 0;
  --firefly-o: 0;
  --shell-bright: 1;
  --ink: #10290f;
  --btn-base: rgba(240, 255, 225, .14);
  --on-wipe: #eef8e4;

  color-scheme: light dark;
  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-deep: #03080b;
    --bg-mid: #0c1d1f;
    --bok: rgba(150, 200, 255, .08);
    --leaf-edge: #12301f;
    --leaf-core: #2d5c3c;
    --leaf-rib: #6c9c7a;
    --rib-hi: #a8d4b4;
    --leaf-rim: rgba(140, 200, 170, .14);
    --vein: rgba(170, 225, 195, .15);
    --vein-fine: rgba(0, 0, 0, .05);
    --cast: rgba(0, 4, 6, .62);
    --key: rgba(160, 195, 255, .35);
    --fill: rgba(0, 0, 12, .7);
    --vig: rgba(0, 0, 0, .72);
    --dapple-o: 0;
    --night-o: 1;
    --firefly-o: 1;
    --shell-bright: .72;
    --ink: #dff3e6;
    --btn-base: rgba(8, 22, 18, .28);
    --on-wipe: #08140f;
  }
}
:root[data-theme="dark"] {
  --bg-deep: #03080b;
  --bg-mid: #0c1d1f;
  --bok: rgba(150, 200, 255, .08);
  --leaf-edge: #12301f;
  --leaf-core: #2d5c3c;
  --leaf-rib: #6c9c7a;
  --rib-hi: #a8d4b4;
  --leaf-rim: rgba(140, 200, 170, .14);
  --vein: rgba(170, 225, 195, .15);
  --vein-fine: rgba(0, 0, 0, .05);
  --cast: rgba(0, 4, 6, .62);
  --key: rgba(160, 195, 255, .35);
  --fill: rgba(0, 0, 12, .7);
  --vig: rgba(0, 0, 0, .72);
  --dapple-o: 0;
  --night-o: 1;
  --firefly-o: 1;
  --shell-bright: .72;
  --ink: #dff3e6;
  --btn-base: rgba(8, 22, 18, .28);
  --on-wipe: #08140f;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-padding-top: env(safe-area-inset-top, 0px); }
html, body { height: 100%; overflow: hidden; }
body {
  background: var(--bg-deep);
  font-family: "Avenir Next", Avenir, "Segoe UI Variable Text", "Segoe UI", system-ui, sans-serif;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

/* The state machine: a visually hidden checkbox, toggled by two labels */
.toggle {
  position: fixed; top: 0; left: 0;
  width: 1px; height: 1px;
  opacity: 0; pointer-events: none;
}

/* =====================================================================
   3. SCENE
   ===================================================================== */
.stage {
  position: fixed; inset: 0;
  overflow: hidden;
  isolation: isolate;
  background: radial-gradient(ellipse at 50% 50%, var(--bg-mid), var(--bg-deep) 75%);
}
.stage > * { position: absolute; }

.bokeh {
  inset: -8%;
  background:
    radial-gradient(circle at 8% 14%,  var(--bok) 0 2.2vmax, transparent 2.7vmax),
    radial-gradient(circle at 22% 5%,  var(--bok) 0 1.2vmax, transparent 1.6vmax),
    radial-gradient(circle at 91% 9%,  var(--bok) 0 2.8vmax, transparent 3.3vmax),
    radial-gradient(circle at 96% 46%, var(--bok) 0 1.6vmax, transparent 2vmax),
    radial-gradient(circle at 4% 62%,  var(--bok) 0 1.9vmax, transparent 2.4vmax),
    radial-gradient(circle at 12% 94%, var(--bok) 0 2.6vmax, transparent 3.1vmax),
    radial-gradient(circle at 88% 92%, var(--bok) 0 2vmax,   transparent 2.5vmax),
    radial-gradient(circle at 70% 3%,  var(--bok) 0 1.4vmax, transparent 1.8vmax);
  filter: blur(3px);
}

/* A square with two opposite corners rounded at 100% is a lens: a leaf */
.leaf, .leaf-shadow {
  left: 50%; top: 50%;
  width: var(--ls); height: var(--ls);
  translate: -50% -50%;
  rotate: 20deg;
  border-radius: 100% 0;
}
/* The drop shadow sits on its own copy of the shape, so the leaf itself
   can be hard-clipped to its outline without clipping the shadow */
.leaf-shadow {
  background: var(--leaf-edge);
  box-shadow: 0 2.5vmax 6vmax rgba(0,0,0,.45);
}
.leaf {
  --vs: 5.5vmax;
  /* Clips everything inside (veins, moving sunlight) to the leaf outline,
     so nothing animated can ever spill past the edge */
  clip-path: inset(0 round 100% 0);
  background:
    linear-gradient(135deg,
      transparent 49.4%, rgba(0,0,0,.18) 49.62%, var(--leaf-rib) 49.82%,
      var(--rib-hi) 50%, var(--leaf-rib) 50.18%, rgba(0,0,0,.14) 50.38%, transparent 50.6%),
    repeating-linear-gradient(35deg,  var(--vein-fine) 0 1px, transparent 1px 13px),
    repeating-linear-gradient(-55deg, var(--vein-fine) 0 1px, transparent 1px 17px),
    radial-gradient(circle at 50% 50%, var(--leaf-core), var(--leaf-edge) 52%);
  box-shadow:
    inset 0 0 5vmax rgba(0,0,0,.3),
    inset 0 0 0 .35vmax var(--leaf-rim);
}
/* Secondary veins: one set per half, each masked to its side of the midrib */
.leaf::before, .leaf::after { content: ""; position: absolute; inset: 0; }
.leaf::before {
  background:
    repeating-linear-gradient(85deg,
      transparent 0 calc(var(--vs) - .55vmax), var(--vein) calc(var(--vs) - .25vmax), transparent var(--vs));
  -webkit-mask-image: linear-gradient(135deg, #000 49.8%, transparent 49.8%);
          mask-image: linear-gradient(135deg, #000 49.8%, transparent 49.8%);
}
.leaf::after {
  background:
    repeating-linear-gradient(185deg,
      transparent 0 calc(var(--vs) - .55vmax), var(--vein) calc(var(--vs) - .25vmax), transparent var(--vs)),
    linear-gradient(rgba(0,0,0,.07), rgba(0,0,0,.07));
  -webkit-mask-image: linear-gradient(135deg, transparent 50.2%, #000 50.2%);
          mask-image: linear-gradient(135deg, transparent 50.2%, #000 50.2%);
}

/* Dew drops: brighten what's behind them, cast a shadow, focus a caustic */
.drop {
  left: var(--x); top: var(--y);
  width: var(--d); height: var(--d);
  translate: -50% -50%;
  border-radius: 50%;
  background:
    radial-gradient(circle at 33% 28%, rgba(255,255,255,.95) 0 7%, rgba(255,255,255,0) 15%),
    radial-gradient(circle at 64% 72%, rgba(255,255,255,.4), rgba(255,255,255,0) 38%),
    radial-gradient(circle at 50% 45%, rgba(255,255,255,.05) 50%, rgba(10,40,10,.3) 100%);
  -webkit-backdrop-filter: saturate(1.25) brightness(1.14) blur(.6px);
          backdrop-filter: saturate(1.25) brightness(1.14) blur(.6px);
  box-shadow:
    calc(var(--d) * .14) calc(var(--d) * .2) calc(var(--d) * .18) calc(var(--d) * -.04) var(--cast),
    inset calc(var(--d) * -.05) calc(var(--d) * -.08) calc(var(--d) * .1) rgba(255,255,255,.3),
    inset calc(var(--d) * .04) calc(var(--d) * .06) calc(var(--d) * .1) rgba(0,30,0,.22);
}
.drop::after {
  content: ""; position: absolute;
  left: 56%; top: 70%; width: 46%; height: 34%;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(255,255,215,.7), rgba(255,255,200,0));
  mix-blend-mode: screen;
}
.drop--hero { --x: 50%; --y: 50%; --d: calc(var(--u) * 56); }
.drop--a { --x: 16%; --y: 26%; --d: calc(var(--u) * 22); }
.drop--b { --x: 82%; --y: 20%; --d: calc(var(--u) * 30); }
.drop--c { --x: 76%; --y: 80%; --d: calc(var(--u) * 18); }
.drop--d { --x: 26%; --y: 78%; --d: calc(var(--u) * 26); }

/* =====================================================================
   4. MOTION RIG
   .orbit owns the heading, .beetle owns the behaviour timeline,
   .flight owns body sway, hover bob and the cast shadow.
   ===================================================================== */
.orbit {
  left: 50%; top: 50%;
  width: 0; height: 0;
  rotate: var(--heading);
  animation: patrol var(--cycle) infinite;
}
.track { position: absolute; left: 0; top: 0; translate: var(--R) 0; }

.beetle {
  position: absolute;
  left: calc(var(--u) * -50);
  top: calc(var(--u) * -88);
  width: calc(var(--u) * 100);
  height: calc(var(--u) * 170);
  display: block;
  cursor: pointer;
  --lift: 0;

  /* The light lives at the top-left of the screen. Rotate that direction
     into the beetle's own frame so highlights never turn with the body. */
  --lx: calc(-.7071 * (cos(var(--heading)) + sin(var(--heading))));
  --ly: calc( .7071 * (sin(var(--heading)) - cos(var(--heading))));

  /* Shadow offset is fixed in screen space (down-right), so rotate it too */
  --sd:  calc(var(--u) * (5 + var(--lift) * 30));
  --shx: calc(var(--sd) * (.6 * cos(var(--heading)) + .8 * sin(var(--heading))));
  --shy: calc(var(--sd) * (.8 * cos(var(--heading)) - .6 * sin(var(--heading))));
  --shb: calc(var(--u) * (2.5 + var(--lift) * 12));

  animation:
    routine var(--cycle) infinite,
    shimmer 7s ease-in-out infinite;
  transition: --lift .9s cubic-bezier(.3, .7, .2, 1);
}

/* Startled: take off, hover in place, pause the patrol */
.toggle:checked ~ .stage .beetle { --lift: 1; animation-play-state: paused; }
.toggle:checked ~ .stage .orbit  { animation-play-state: paused; }

.ao {
  position: absolute; display: block;
  left: calc(var(--u) * 12); top: calc(var(--u) * 24);
  width: calc(var(--u) * 76); height: calc(var(--u) * 142);
  border-radius: 50%;
  background: radial-gradient(closest-side, var(--cast), transparent);
  opacity: calc(.8 - var(--lift) * .8);
  filter: blur(calc(var(--u) * 3));
}

.flight {
  position: absolute; inset: 0; display: block;
  --o: max(var(--open), var(--lift));
  --fan: max(var(--sense), var(--alert), var(--lift));
  /* On take-off it drifts a little toward the centre of the leaf */
  translate: calc(var(--u) * -24 * var(--lift)) calc(var(--u) * -7 * var(--lift) * (1 + var(--bob)));
  rotate: calc(var(--sway) * var(--walk) * (1 - var(--lift)) * 1.6deg);
  scale: calc(1 + var(--lift) * .2);
  filter: brightness(var(--shell-bright)) drop-shadow(var(--shx) var(--shy) var(--shb) var(--cast));
  transition: --alert .35s ease;
  animation:
    sway var(--gait) ease-in-out infinite,
    bob 1.3s ease-in-out infinite alternate;
}
.beetle:hover .flight { --alert: 1; }

/* =====================================================================
   5. ANATOMY
   Only the right side is drawn. The left side is the same markup inside
   a mirrored wrapper, with its light direction flipped to match.
   ===================================================================== */
.half { position: absolute; inset: 0; display: block; --hx: var(--lx); }
.half--l { scale: -1 1; --hx: calc(var(--lx) * -1); }

/* ---- Legs: coxa pivot > femur > tibia > tarsus, tripod gait ---- */
.leg {
  position: absolute; display: block;
  left: calc(var(--u) * var(--ax));
  top: calc(var(--u) * var(--ay));
  width: 0; height: 0;
  rotate: calc(var(--base)
              + var(--stride) * var(--amp) * var(--walk) * (1 - var(--lift))
              + var(--lift) * var(--tuck));
  animation: step var(--gait) infinite;
}
.leg--1 { --ax: 68; --ay: 50; --base: -40deg; --amp: 13deg; --tuck: -18deg;
          --fl: 28; --tl: 26; --tsl: 15; --knee: -36deg; --kfold: -16deg; --ktuck: -50deg; --ankle: -20deg; }
.leg--2 { --ax: 71; --ay: 74; --base: 10deg;  --amp: 15deg; --tuck: 22deg;
          --fl: 30; --tl: 30; --tsl: 17; --knee: 34deg;  --kfold: 16deg;  --ktuck: 70deg;  --ankle: 18deg; }
.leg--3 { --ax: 69; --ay: 90; --base: 44deg;  --amp: 12deg; --tuck: 26deg;
          --fl: 34; --tl: 36; --tsl: 19; --knee: 24deg;  --kfold: 14deg;  --ktuck: 60deg;  --ankle: 12deg; }
/* Tripod: R1 + L2 + R3 step together, then L1 + R2 + L3 */
.half--r .leg--2,
.half--l .leg--1,
.half--l .leg--3 { animation-delay: calc(var(--gait) * -.5); }

.femur, .tibia, .tarsus { position: absolute; display: block; transform-origin: 0 50%; }
.femur {
  left: 0; top: calc(var(--u) * -2.7);
  width: calc(var(--u) * var(--fl)); height: calc(var(--u) * 5.4);
  border-radius: calc(var(--u) * 2.7);
  background: linear-gradient(180deg, #5c8a3f 0%, #23471c 45%, #0c1d0b 100%);
}
.tibia {
  left: calc(100% - var(--u) * 2.4); top: calc(50% - var(--u) * 2.1);
  width: calc(var(--u) * var(--tl)); height: calc(var(--u) * 4.2);
  border-radius: calc(var(--u) * 1.4) calc(var(--u) * 2.1) calc(var(--u) * 2.1) calc(var(--u) * 1.4);
  background: linear-gradient(180deg, #4f7c35, #1c3a17 50%, #0a170a);
  rotate: calc(var(--knee) + var(--fold) * var(--kfold) * var(--walk) + var(--lift) * var(--ktuck));
}
/* Digging teeth on the front tibia */
.leg--1 .tibia::before {
  content: ""; position: absolute;
  right: calc(var(--u) * 1); top: calc(var(--u) * -2.6);
  width: 62%; height: calc(var(--u) * 3);
  background: #0f1f0c;
  clip-path: polygon(0 100%, 18% 0, 34% 100%, 52% 0, 68% 100%, 86% 0, 100% 100%);
}
.tarsus {
  left: calc(100% - var(--u) * 1.2); top: calc(50% - var(--u) * 1.3);
  width: calc(var(--u) * var(--tsl)); height: calc(var(--u) * 2.6);
  border-radius: calc(var(--u) * 1.3);
  background: repeating-linear-gradient(90deg, #3a2e18 0 calc(var(--u) * 3.2), #0f0c07 calc(var(--u) * 3.2) calc(var(--u) * 4));
  rotate: calc(var(--ankle) + var(--lift) * var(--ktuck) * .4);
}
.tarsus::after {
  content: ""; position: absolute;
  left: calc(100% - var(--u)); top: 50%;
  width: calc(var(--u) * 4.5); height: calc(var(--u) * 5);
  translate: 0 -50%;
  background: #0b0905;
  clip-path: polygon(0 38%, 100% 0, 30% 50%, 100% 100%, 0 62%);
}

/* ---- Abdomen: only seen when the wing cases lift ---- */
.abdomen {
  position: absolute; display: block;
  left: calc(var(--u) * 50); top: calc(var(--u) * 66);
  width: calc(var(--u) * 40); height: calc(var(--u) * 96);
  border-radius: 0 60% 70% 0 / 0 30% 70% 0;
  background:
    repeating-linear-gradient(180deg, transparent 0 calc(var(--u) * 12), rgba(0,0,0,.45) calc(var(--u) * 12) calc(var(--u) * 13.4)),
    radial-gradient(ellipse at 0% 35%, #45542c, #1c2412 60%, #0b0f07);
}

/* ---- Hind wing: folded under the elytron, unfurls and buzzes ---- */
.wing {
  position: absolute; display: block;
  left: calc(var(--u) * 54); top: calc(var(--u) * 54);
  width: calc(var(--u) * 104); height: calc(var(--u) * 38);
  transform-origin: 0 50%;
  rotate: calc(108deg - var(--o) * 112deg + var(--o) * var(--flap) * 18deg);
  scale: calc(.45 + var(--o) * .55 * (.8 + var(--flap) * .2)) calc(.6 + var(--o) * .4);
  opacity: calc(var(--o) * 1.5);
  border-radius: 8% 80% 60% 14% / 30% 55% 80% 70%;
  background:
    linear-gradient(180deg, rgba(70,40,18,.95) 0 calc(var(--u) * 2), transparent calc(var(--u) * 2.8)),
    linear-gradient(172deg, transparent 38%, rgba(80,50,25,.5) 39.5%, transparent 41%),
    repeating-linear-gradient(78deg, transparent 0 calc(var(--u) * 13), rgba(90,60,30,.4) calc(var(--u) * 13) calc(var(--u) * 13.8)),
    linear-gradient(90deg, rgba(110,75,45,.7), rgba(215,200,180,.42) 30%, rgba(200,235,225,.32) 65%, rgba(235,205,235,.26));
  box-shadow: inset 0 0 0 calc(var(--u) * .6) rgba(70,45,20,.35);
  animation: flap .075s linear infinite alternate;
}
.wing::after {
  content: ""; position: absolute; inset: 0;
  border-radius: inherit;
  transform-origin: 0 50%;
  rotate: calc(var(--flap) * -14deg);
  background: rgba(225, 235, 245, .28);
  filter: blur(calc(var(--u) * 2.5));
}

/* ---- Elytron: the iridescent wing case ---- */
.elytron {
  position: absolute; display: block;
  left: calc(var(--u) * 50); top: calc(var(--u) * 62);
  width: calc(var(--u) * 46); height: calc(var(--u) * 104);
  border-radius: calc(var(--u) * 2) 48% 92% 8% / calc(var(--u) * 2) 16% 82% 18%;
  transform-origin: 6% 3%;
  rotate: calc(var(--o) * -34deg);
  scale: calc(1 - var(--o) * .2) 1;
  translate: calc(var(--o) * var(--u) * 5) calc(var(--o) * var(--u) * -3);
  background:
    radial-gradient(ellipse 30% 20% at calc(50% + var(--hx) * 30%) calc(30% + var(--ly) * 18%),
      rgba(255,255,255,.85), rgba(255,255,255,0) 70%),
    radial-gradient(ellipse 70% 50% at calc(50% + var(--hx) * 25%) calc(42% + var(--ly) * 25%),
      rgba(255,255,255,.28), rgba(255,255,255,0) 70%),
    repeating-linear-gradient(90deg,
      rgba(0,0,0,0) 0 calc(var(--u) * 5.2), rgba(0,0,0,.14) calc(var(--u) * 5.2) calc(var(--u) * 6)),
    radial-gradient(circle, rgba(0,0,0,.18) 0 calc(var(--u) * .45), transparent calc(var(--u) * .9))
      0 0 / calc(var(--u) * 6) calc(var(--u) * 4.5),
    radial-gradient(ellipse 80% 70% at 45% 40%, transparent 55%, rgba(0,12,6,.7) 100%),
    conic-gradient(from calc(var(--shimmer) - var(--heading)) at 50% -40%, var(--iri));
  box-shadow:
    inset calc(var(--hx) * -3.5 * var(--u)) calc(var(--ly) * -3.5 * var(--u)) calc(var(--u) * 4) rgba(255,255,255,.32),
    inset calc(var(--hx) * 5 * var(--u)) calc(var(--ly) * 5 * var(--u)) calc(var(--u) * 8) rgba(0,0,0,.5),
    inset calc(var(--u) * 1) 0 0 rgba(0,0,0,.35);
}

/* ---- Mandible: a quarter-arc hook that chews while the beetle is curious ---- */
.mandible {
  position: absolute; display: block;
  left: calc(var(--u) * 51); top: calc(var(--u) * -5);
  width: calc(var(--u) * 12); height: calc(var(--u) * 12);
  border-radius: 50%;
  border: calc(var(--u) * 2.4) solid transparent;
  border-top-color: #1a1209;
  border-right-color: #1a1209;
  transform-origin: 80% 85%;
  rotate: calc(-20deg + var(--fan) * var(--chew) * 16deg);
  animation: chew .28s ease-in-out infinite alternate;
}

/* ---- Centre pieces (drawn once) ---- */
.pronotum, .scutellum, .head { position: absolute; display: block; }
.pronotum {
  left: calc(var(--u) * 9); top: calc(var(--u) * 24);
  width: calc(var(--u) * 82); height: calc(var(--u) * 42);
  border-radius: 46% 46% 18% 18% / 70% 70% 30% 30%;
  background:
    radial-gradient(circle at calc(50% + var(--lx) * 22%) calc(46% + var(--ly) * 22%),
      rgba(255,255,255,.9) 0 calc(var(--u) * 1.6), transparent calc(var(--u) * 4)),
    radial-gradient(ellipse 40% 45% at calc(50% + var(--lx) * 28%) calc(48% + var(--ly) * 30%),
      rgba(255,255,255,.55), rgba(255,255,255,0) 70%),
    linear-gradient(90deg, transparent 49.2%, rgba(0,0,0,.2) 50%, transparent 50.8%),
    radial-gradient(circle, rgba(0,0,0,.14) 0 calc(var(--u) * .5), transparent calc(var(--u) * 1))
      0 0 / calc(var(--u) * 5) calc(var(--u) * 5),
    radial-gradient(ellipse at 50% 40%, transparent 45%, rgba(0,14,8,.65) 100%),
    conic-gradient(from calc(var(--shimmer) - var(--heading) + 25deg) at 50% -60%, var(--iri));
  box-shadow:
    inset calc(var(--lx) * -3 * var(--u)) calc(var(--ly) * -3 * var(--u)) calc(var(--u) * 4) rgba(255,255,255,.3),
    inset calc(var(--lx) * 4 * var(--u)) calc(var(--ly) * 4 * var(--u)) calc(var(--u) * 7) rgba(0,0,0,.5),
    0 calc(var(--u) * 1.2) calc(var(--u) * 2.4) rgba(0,0,0,.4);
}
.scutellum {
  left: calc(var(--u) * 44); top: calc(var(--u) * 63);
  width: calc(var(--u) * 12); height: calc(var(--u) * 14);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  background:
    radial-gradient(circle at calc(50% + var(--lx) * 30%) 20%, rgba(255,255,255,.6), transparent 60%),
    conic-gradient(from calc(var(--shimmer) - var(--heading) + 60deg) at 50% -80%, var(--iri));
  opacity: calc(1 - var(--o) * .6);
}
.head {
  left: calc(var(--u) * 30); top: calc(var(--u) * 5);
  width: calc(var(--u) * 40); height: calc(var(--u) * 28);
  border-radius: 50% 50% 42% 42% / 62% 62% 38% 38%;
  background:
    radial-gradient(ellipse 40% 35% at calc(50% + var(--lx) * 25%) calc(45% + var(--ly) * 25%),
      rgba(255,255,255,.55), rgba(255,255,255,0) 70%),
    radial-gradient(ellipse at 50% 60%, rgba(0,20,10,.2) 30%, rgba(0,10,5,.75) 100%),
    conic-gradient(from calc(var(--shimmer) - var(--heading) + 30deg) at 50% -60%, var(--iri));
  box-shadow: 0 calc(var(--u) * 1) calc(var(--u) * 2) rgba(0,0,0,.4);
}
/* Clypeus: the front plate of the head */
.head::before {
  content: ""; position: absolute;
  left: calc(var(--u) * 5); top: calc(var(--u) * -5);
  width: calc(var(--u) * 30); height: calc(var(--u) * 12);
  border-radius: 50% 50% 20% 20% / 90% 90% 10% 10%;
  background: linear-gradient(180deg, #2a7a50, #0a3020);
  box-shadow: inset 0 calc(var(--u) * 1) calc(var(--u) * 1) rgba(255,255,255,.22);
}

/* ---- Eye ---- */
.eye {
  position: absolute; display: block;
  left: calc(var(--u) * 64); top: calc(var(--u) * 13);
  width: calc(var(--u) * 10); height: calc(var(--u) * 12);
  border-radius: 50% 50% 45% 55%;
  background:
    radial-gradient(circle at calc(50% + var(--hx) * 22%) calc(50% + var(--ly) * 22%),
      rgba(255,255,255,.9) 0 8%, transparent 15%),
    radial-gradient(circle at 50% 50%, #4a3320, #0d0805 72%);
  box-shadow: 0 0 0 calc(var(--u) * .6) rgba(0,0,0,.45);
}

/* ---- Antenna: stalk plus a three-plate club that fans open to smell ---- */
.antenna {
  position: absolute; display: block;
  left: calc(var(--u) * 58); top: calc(var(--u) * -16);
  width: calc(var(--u) * 2.6); height: calc(var(--u) * 22);
  border-radius: var(--u);
  transform-origin: 50% 100%;
  rotate: calc(30deg + var(--twitch) * 7deg + var(--fan) * 14deg);
  background: repeating-linear-gradient(180deg, #2a1d10 0 calc(var(--u) * 3), #4a3420 calc(var(--u) * 3) calc(var(--u) * 4));
  animation: twitch 3.4s ease-in-out infinite;
}
.half--l .antenna { animation-delay: -1.3s; }
.club { position: absolute; display: block; left: 50%; bottom: calc(100% - var(--u)); width: 0; height: 0; }
.lam {
  position: absolute; display: block;
  left: calc(var(--u) * -2.8); bottom: 0;
  width: calc(var(--u) * 5.6); height: calc(var(--u) * 10);
  border-radius: 50% 50% 40% 40% / 60% 60% 40% 40%;
  transform-origin: 50% 100%;
  rotate: calc(var(--k) * (6deg + var(--fan) * 22deg));
  background: linear-gradient(90deg, #3a200c, #8a5a26 45%, #b07d3e 55%, #44260f);
  box-shadow: inset 0 0 0 calc(var(--u) * .5) rgba(0,0,0,.35);
}
.lam:nth-child(1) { --k: -1; }
.lam:nth-child(2) { --k: 1; }
.lam:nth-child(3) { --k: 0; }

/* =====================================================================
   6. ATMOSPHERE
   ===================================================================== */
.dapple {
  position: absolute;
  inset: 0;
  opacity: var(--dapple-o);
  pointer-events: none;
}
/* Normal blending on purpose: a blended layer that animates inside the
   clipped leaf makes Chromium drop the leaf's rounded clip */
.dapple__blobs {
  position: absolute;
  inset: -6%;
  background:
    radial-gradient(ellipse 11vmax 7vmax at 34% 40%, rgba(255,252,222,.34), transparent),
    radial-gradient(ellipse 8vmax 5.5vmax at 60% 36%, rgba(255,252,222,.28), transparent),
    radial-gradient(ellipse 12vmax 8vmax at 66% 60%, rgba(255,252,222,.32), transparent),
    radial-gradient(ellipse 9vmax 6vmax at 40% 62%, rgba(255,252,222,.27), transparent),
    radial-gradient(ellipse 7vmax 5vmax at 50% 49%, rgba(255,252,222,.22), transparent),
    radial-gradient(ellipse 9vmax 6vmax at 78% 46%, rgba(255,252,222,.26), transparent),
    radial-gradient(ellipse 8vmax 5.5vmax at 22% 54%, rgba(255,252,222,.26), transparent);
  filter: blur(18px);
  animation: dapple 16s ease-in-out infinite alternate;
}
.fireflies { inset: 0; opacity: var(--firefly-o); pointer-events: none; }
.firefly {
  position: absolute;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: #f8ffc4;
  box-shadow: 0 0 8px 3px rgba(225,255,120,.95), 0 0 34px 14px rgba(190,255,90,.32);
  animation:
    ff-drift var(--t) ease-in-out infinite alternate,
    ff-blink var(--b) ease-in-out infinite;
}
.firefly:nth-child(1) { left: 12%; top: 32%; --dx: 9vmin;  --dy: -7vmin; --t: 13s; --b: 3.4s; }
.firefly:nth-child(2) { left: 84%; top: 28%; --dx: -8vmin; --dy: 6vmin;  --t: 11s; --b: 4.1s; animation-delay: -3s, -1.1s; }
.firefly:nth-child(3) { left: 70%; top: 74%; --dx: 7vmin;  --dy: -9vmin; --t: 15s; --b: 2.9s; animation-delay: -6s, -2.2s; }
.firefly:nth-child(4) { left: 24%; top: 70%; --dx: -6vmin; --dy: -5vmin; --t: 12s; --b: 3.7s; animation-delay: -2s, -.4s; }
.firefly:nth-child(5) { left: 46%; top: 12%; --dx: 10vmin; --dy: 4vmin;  --t: 17s; --b: 4.6s; animation-delay: -9s, -3s; }
.firefly:nth-child(6) { left: 92%; top: 60%; --dx: -9vmin; --dy: -4vmin; --t: 14s; --b: 3.1s; animation-delay: -4s, -1.7s; }
.firefly:nth-child(7) { left: 6%;  top: 86%; --dx: 8vmin;  --dy: -6vmin; --t: 16s; --b: 5.2s; animation-delay: -7s, -2.6s; }
.firefly:nth-child(8) { left: 58%; top: 90%; --dx: -7vmin; --dy: -8vmin; --t: 12.5s; --b: 3.9s; animation-delay: -5s, -.9s; }

.moon {
  inset: 0; pointer-events: none;
  opacity: var(--night-o);
  mix-blend-mode: screen;
  background: radial-gradient(circle at 6% 4%, rgba(190,215,255,.32), transparent 45%);
}
.light {
  inset: 0; pointer-events: none;
  mix-blend-mode: soft-light;
  background: linear-gradient(135deg, var(--key) 0%, transparent 42%, transparent 60%, var(--fill) 100%);
}
.vignette {
  inset: 0; pointer-events: none;
  background: radial-gradient(ellipse at 50% 50%, transparent 52%, var(--vig) 100%);
}

/* =====================================================================
   7. CONTROL
   ===================================================================== */
.ui {
  position: fixed; top: 50%; right: 0;
  translate: 0 -50%;
  z-index: 10;
  padding-right: calc(env(safe-area-inset-right, 0px) + clamp(16px, 3vw, 44px));
  pointer-events: none;
}

/* The swipe: one solid layer sized from 0% to 100%. Its anchor flips
   instantly (position isn't transitioned), so it enters from one side
   and leaves from the other. The label text carries an identical layer,
   clipped to the letters, so the colour change tracks the edge exactly. */
.btn {
  --wipe-rest: right center;
  --wipe-go: left center;
  --wipe-0: 0% 100%;
  --ease: cubic-bezier(.77, 0, .18, 1);
  pointer-events: auto;
  display: grid;
  cursor: pointer;
  user-select: none; -webkit-user-select: none;
  border: 1px solid color-mix(in srgb, var(--ink) 55%, transparent);
  background:
    linear-gradient(var(--ink), var(--ink)) no-repeat var(--wipe-rest) / var(--wipe-0),
    var(--btn-base);
  -webkit-backdrop-filter: blur(8px);
          backdrop-filter: blur(8px);
  transition: background-size .55s var(--ease), border-color .55s var(--ease);
}
.btn__label {
  grid-area: 1 / 1;
  padding: 15px 28px;
  font-size: 14px; font-weight: 500; line-height: 1;
  letter-spacing: .04em;
  text-align: center;
  white-space: nowrap;
  color: transparent;
  background:
    linear-gradient(var(--on-wipe), var(--on-wipe)) no-repeat var(--wipe-rest) / var(--wipe-0),
    linear-gradient(var(--ink), var(--ink));
  -webkit-background-clip: text;
          background-clip: text;
  transition: background-size .55s var(--ease);
}

.btn:active,
.toggle:focus-visible ~ .ui .btn { border-color: var(--ink); }
.btn:active,
.btn:active .btn__label,
.toggle:focus-visible ~ .ui .btn,
.toggle:focus-visible ~ .ui .btn__label {
  background-size: 100% 100%, auto;
  background-position: var(--wipe-go), 0 0;
}
@media (hover: hover) {
  .btn:hover { border-color: var(--ink); }
  .btn:hover,
  .btn:hover .btn__label {
    background-size: 100% 100%, auto;
    background-position: var(--wipe-go), 0 0;
  }
}
.toggle:focus-visible ~ .ui .btn { outline: 1px solid var(--ink); outline-offset: 4px; }

/* Both labels share one grid cell, so the button keeps its size when it swaps */
.when-flying { visibility: hidden; }
.toggle:checked ~ .ui .when-landed { visibility: hidden; }
.toggle:checked ~ .ui .when-flying { visibility: visible; }

/* Phones: a slim vertical tab on the edge, swiping top to bottom,
   and a slightly tighter patrol so the beetle passes beside it */
@media (max-width: 600px) {
  :root {
    --R: min(calc(var(--u) * 165),
             calc(50vmin - var(--u) * 90),
             calc(var(--leaf-half) - var(--u) * 112 - 12px),
             calc(50vw - var(--u) * 90 - 20px));
  }
  .ui { padding-right: calc(env(safe-area-inset-right, 0px) + 8px); }
  .btn { --wipe-rest: center bottom; --wipe-go: center top; --wipe-0: 100% 0%; }
  .btn__label { writing-mode: vertical-rl; padding: 24px 13px; }
}

/* =====================================================================
   8. KEYFRAMES
   ===================================================================== */
/* Walk half a lap, stop and air the wings, walk the other half, pause */
@keyframes patrol {
  0%        { --heading: 0deg;    animation-timing-function: cubic-bezier(.42, 0, 1, 1); }
  3%        { --heading: -8deg;   animation-timing-function: linear; }
  37%       { --heading: -172deg; animation-timing-function: cubic-bezier(0, 0, .58, 1); }
  40%, 56%  { --heading: -180deg; animation-timing-function: cubic-bezier(.42, 0, 1, 1); }
  59%       { --heading: -188deg; animation-timing-function: linear; }
  93%       { --heading: -352deg; animation-timing-function: cubic-bezier(0, 0, .58, 1); }
  96%, 100% { --heading: -360deg; }
}
@keyframes routine {
  0%    { --walk: 0; --open: 0; --sense: 0; }
  3%    { --walk: 1; }
  37%   { --walk: 1; --sense: 0; }
  40%   { --walk: 0; --sense: 1; --open: 0; }
  43.5% { --open: 1; }
  51%   { --open: 1; }
  55%   { --open: 0; --sense: 1; }
  56%   { --walk: 0; }
  59%   { --walk: 1; --sense: 0; }
  93%   { --walk: 1; }
  96%   { --walk: 0; --sense: 0; }
  98%   { --sense: 1; }
  100%  { --walk: 0; --sense: 0; --open: 0; }
}
@keyframes step {
  0%   { --stride: -1; --fold: 0; animation-timing-function: linear; }
  60%  { --stride: 1;  --fold: 0; animation-timing-function: ease-in-out; }
  80%  { --fold: 1; }
  100% { --stride: -1; --fold: 0; }
}
@keyframes sway    { 0%, 100% { --sway: -1; } 50% { --sway: 1; } }
@keyframes bob     { from { --bob: -1; } to { --bob: 1; } }
@keyframes flap    { from { --flap: -1; } to { --flap: 1; } }
@keyframes chew    { from { --chew: -1; } to { --chew: 1; } }
@keyframes shimmer { 0%, 100% { --shimmer: -20deg; } 50% { --shimmer: 25deg; } }
@keyframes twitch {
  0%, 100% { --twitch: 0; }
  20% { --twitch: 1; }
  27% { --twitch: -.4; }
  50% { --twitch: .2; }
  63% { --twitch: -1; }
  70% { --twitch: .5; }
  85% { --twitch: 0; }
}
@keyframes dapple { from { translate: -2% 1%; } to { translate: 2% -1.5%; } }
@keyframes ff-drift {
  0%   { translate: 0 0; }
  33%  { translate: var(--dx) calc(var(--dy) * .4); }
  66%  { translate: calc(var(--dx) * .3) var(--dy); }
  100% { translate: calc(var(--dx) * -.5) calc(var(--dy) * .6); }
}
@keyframes ff-blink {
  0%, 50%, 100% { opacity: .22; scale: .6; }
  68% { opacity: 1; scale: 1; }
  84% { opacity: .4; }
}

@media (prefers-reduced-motion: reduce) {
  .orbit, .beetle, .flight, .leg, .wing, .antenna, .mandible,
  .dapple__blobs, .firefly { animation: none !important; }
  .beetle { transition-duration: .2s; }
  .btn, .btn__label { transition-duration: .01s; }
}
</style>
</head>
<body>

<input type="checkbox" id="fly" class="toggle" aria-label="Startle the beetle">

<main class="stage" aria-label="A jewel scarab patrolling a dew drop on a leaf">
  <div class="bokeh"></div>
  <div class="leaf-shadow"></div>
  <div class="leaf"><div class="dapple"><div class="dapple__blobs"></div></div></div>

  <div class="drop drop--a"></div>
  <div class="drop drop--b"></div>
  <div class="drop drop--c"></div>
  <div class="drop drop--d"></div>
  <div class="drop drop--hero"></div>

  <div class="orbit">
    <div class="track">
      <label class="beetle" for="fly" title="Startle the beetle">
        <span class="ao"></span>
        <span class="flight">

          <!-- Lower layer, both sides: legs, abdomen, wing, wing case, mandible -->
          <span class="half half--l">
            <span class="leg leg--1"><span class="femur"><span class="tibia"><span class="tarsus"></span></span></span></span>
            <span class="leg leg--2"><span class="femur"><span class="tibia"><span class="tarsus"></span></span></span></span>
            <span class="leg leg--3"><span class="femur"><span class="tibia"><span class="tarsus"></span></span></span></span>
            <span class="abdomen"></span>
            <span class="wing"></span>
            <span class="elytron"></span>
            <span class="mandible"></span>
          </span>
          <span class="half half--r">
            <span class="leg leg--1"><span class="femur"><span class="tibia"><span class="tarsus"></span></span></span></span>
            <span class="leg leg--2"><span class="femur"><span class="tibia"><span class="tarsus"></span></span></span></span>
            <span class="leg leg--3"><span class="femur"><span class="tibia"><span class="tarsus"></span></span></span></span>
            <span class="abdomen"></span>
            <span class="wing"></span>
            <span class="elytron"></span>
            <span class="mandible"></span>
          </span>

          <!-- Centre line -->
          <span class="pronotum"></span>
          <span class="scutellum"></span>
          <span class="head"></span>

          <!-- Upper layer, both sides: eyes and antennae -->
          <span class="half half--l">
            <span class="eye"></span>
            <span class="antenna"><span class="club"><span class="lam"></span><span class="lam"></span><span class="lam"></span></span></span>
          </span>
          <span class="half half--r">
            <span class="eye"></span>
            <span class="antenna"><span class="club"><span class="lam"></span><span class="lam"></span><span class="lam"></span></span></span>
          </span>

        </span>
      </label>
    </div>
  </div>

  <div class="fireflies">
    <span class="firefly"></span><span class="firefly"></span><span class="firefly"></span><span class="firefly"></span>
    <span class="firefly"></span><span class="firefly"></span><span class="firefly"></span><span class="firefly"></span>
  </div>
  <div class="moon"></div>
  <div class="light"></div>
  <div class="vignette"></div>
</main>

<div class="ui">
  <label class="btn" for="fly">
    <span class="btn__label when-landed">Startle it</span>
    <span class="btn__label when-flying">Let it land</span>
  </label>
</div>

</body>
</html>
</USER_REQUEST>
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