:root {
  color-scheme: light;
  --panel: #f1f0eb;
  --panel-ink: #161713;
  --hairline: rgba(22, 23, 19, 0.14);
  --toolbar: rgba(246, 245, 240, 0.94);
  --ui-muted: #74756e;
  --ui-soft: rgba(0, 0, 0, 0.045);
  --ui-hover: rgba(0, 0, 0, 0.075);
  --ui-surface: rgba(255, 255, 255, 0.35);
  --ui-selected: #171814;
  --ui-selected-ink: #fff;
  --ui-track: #c4c4bd;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --panel: #1d1a17;
  --panel-ink: #f2ede6;
  --hairline: rgba(242, 237, 230, 0.14);
  --toolbar: rgba(29, 26, 23, 0.92);
  --ui-muted: #aaa39a;
  --ui-soft: rgba(255, 255, 255, 0.05);
  --ui-hover: rgba(255, 255, 255, 0.09);
  --ui-surface: rgba(255, 255, 255, 0.055);
  --ui-selected: #f2ede6;
  --ui-selected-ink: #171411;
  --ui-track: #56514b;
}

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  background: #050505;
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
  -webkit-font-smoothing: antialiased;
}

button,
input { font: inherit; }

button { color: inherit; }

.app-shell {
  position: relative;
  width: 100vw;
  height: 100dvh;
  min-height: 420px;
  overflow: hidden;
  isolation: isolate;
  background: #050505;
}

.shader-stage {
  position: absolute;
  inset: 0;
  background: #050505;
  cursor: crosshair;
  touch-action: none;
}

.shader-stage canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.scene-nav {
  position: absolute;
  z-index: 3;
  left: 20px;
  bottom: 20px;
  display: flex;
  align-items: center;
  gap: 7px;
  color: rgba(255, 255, 255, 0.58);
  font-family: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, monospace;
  font-size: 10px;
  letter-spacing: 0.04em;
  mix-blend-mode: difference;
}

.scene-nav a {
  min-height: 30px;
  display: inline-flex;
  align-items: center;
  padding: 0 11px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  color: inherit;
  text-decoration: none;
  transition: color 150ms ease, background 150ms ease;
}

.scene-nav a:hover,
.scene-nav a:focus-visible {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.panel-reveal {
  position: absolute;
  z-index: 4;
  top: max(20px, env(safe-area-inset-top));
  right: max(20px, env(safe-area-inset-right));
  height: 39px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 14px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: var(--toolbar);
  color: var(--panel-ink);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-size: 11px;
  cursor: pointer;
  transition: opacity 160ms ease, background 160ms ease;
}

.panel-reveal:hover { background: var(--panel); }
.panel-reveal[aria-expanded="true"] { opacity: 0; pointer-events: none; }

.sliders-icon {
  width: 15px;
  height: 14px;
  display: grid;
  align-content: space-between;
}

.sliders-icon i {
  position: relative;
  display: block;
  width: 15px;
  height: 1px;
  background: currentColor;
}

.sliders-icon i::after {
  content: "";
  position: absolute;
  top: -2px;
  left: 3px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
}

.sliders-icon i:nth-child(2)::after { left: 9px; }
.sliders-icon i:nth-child(3)::after { left: 6px; }

.control-panel {
  position: absolute;
  z-index: 5;
  top: max(18px, env(safe-area-inset-top));
  right: max(18px, env(safe-area-inset-right));
  width: min(310px, calc(100vw - 36px));
  max-height: calc(100dvh - 36px);
  overflow-y: auto;
  padding: 22px;
  border: 1px solid var(--hairline);
  border-radius: 18px;
  background: var(--panel);
  color: var(--panel-ink);
  box-shadow: 0 25px 80px rgba(0, 0, 0, 0.33), 0 2px 10px rgba(0, 0, 0, 0.18);
  transform: translateX(calc(100% + 30px));
  opacity: 0;
  pointer-events: none;
  transition: transform 320ms cubic-bezier(0.22, 1, 0.36, 1), opacity 180ms ease;
  scrollbar-width: none;
}

.control-panel::-webkit-scrollbar { display: none; }

.control-panel.is-open {
  transform: translateX(0);
  opacity: 1;
  pointer-events: auto;
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding-bottom: 17px;
}

.eyebrow {
  display: block;
  margin-bottom: 8px;
  color: var(--ui-muted);
  font-family: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, monospace;
  font-size: 9px;
  line-height: 1;
  letter-spacing: 0.16em;
}

.panel-heading h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.035em;
}

.icon-button {
  width: 31px;
  height: 31px;
  --site-xmark-size: 14px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  padding: 0;
  border: 1px solid var(--hairline);
  border-radius: 50%;
  background: transparent;
  color: var(--panel-ink);
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease;
}

.icon-button:hover {
  background: var(--ui-hover);
  transform: rotate(5deg);
}

.slider-group {
  padding: 17px 0 9px;
  border-top: 1px solid var(--hairline);
}

.slider-group__title {
  margin: 0 0 13px;
  color: var(--ui-muted);
  font-family: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, monospace;
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.range-row {
  display: grid;
  grid-template-columns: 68px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 9px;
  min-height: 33px;
}

.range-row label,
.range-row output {
  font-family: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, monospace;
  font-size: 10px;
  font-variant-numeric: tabular-nums;
}

.range-row label { color: var(--panel-ink); }

.range-row output {
  color: var(--ui-muted);
  text-align: right;
}

.range-row input[type="range"] {
  width: 100%;
  height: 18px;
  margin: 0;
  appearance: none;
  background: transparent;
  cursor: pointer;
}

.range-row input[type="range"]::-webkit-slider-runnable-track {
  height: 3px;
  border-radius: 999px;
  background: var(--ui-track);
}

.range-row input[type="range"]::-webkit-slider-thumb {
  width: 17px;
  height: 17px;
  margin-top: -7px;
  appearance: none;
  border: 4px solid var(--ui-selected);
  border-radius: 50%;
  background: var(--ui-selected-ink);
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.1);
}

.range-row input[type="range"]::-moz-range-track {
  height: 3px;
  border: 0;
  border-radius: 999px;
  background: var(--ui-track);
}

.range-row input[type="range"]::-moz-range-thumb {
  width: 10px;
  height: 10px;
  border: 4px solid var(--ui-selected);
  border-radius: 50%;
  background: var(--ui-selected-ink);
}

.range-row input[type="range"]:focus-visible {
  outline: 2px solid var(--ui-selected);
  outline-offset: 3px;
  border-radius: 999px;
}

.panel-actions {
  display: grid;
  grid-template-columns: 1fr;
  gap: 7px;
  padding-top: 13px;
  border-top: 1px solid var(--hairline);
}

.panel-actions button {
  height: 38px;
  border: 1px solid var(--hairline);
  border-radius: 9px;
  background: var(--ui-surface);
  color: var(--panel-ink);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  transition: color 150ms ease, background 150ms ease;
}

.panel-actions button:hover { background: var(--ui-hover); }

.panel-actions button[aria-pressed="true"] {
  border-color: var(--ui-selected);
  background: var(--ui-selected);
  color: var(--ui-selected-ink);
}

.panel-footnote {
  margin: 14px 0 0;
  color: var(--ui-muted);
  font-size: 9px;
  text-align: center;
}

kbd {
  font-family: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, monospace;
}

.panel-footnote kbd {
  display: inline-grid;
  place-items: center;
  min-width: 17px;
  height: 17px;
  margin: 0 2px;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  color: var(--panel-ink);
  background: var(--ui-surface);
}

.error-message {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 10;
  width: min(360px, calc(100vw - 40px));
  display: grid;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--hairline);
  border-radius: 14px;
  background: var(--panel);
  color: var(--panel-ink);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  text-align: center;
  transform: translate(-50%, -50%);
}

.error-message[hidden] { display: none; }
.error-message span { color: var(--ui-muted); font-size: 11px; line-height: 1.5; }

@media (max-width: 720px) {
  .scene-nav {
    left: max(14px, env(safe-area-inset-left));
    top: max(14px, env(safe-area-inset-top));
    bottom: auto;
  }

  .scene-nav a:last-child { display: none; }

  .panel-reveal {
    top: max(14px, env(safe-area-inset-top));
    right: max(14px, env(safe-area-inset-right));
  }

  .control-panel {
    top: auto;
    right: 10px;
    bottom: max(10px, env(safe-area-inset-bottom));
    width: calc(100vw - 20px);
    max-height: calc(100dvh - 76px);
    padding: 20px;
    border-radius: 18px;
    transform: translateY(calc(100% + 20px));
  }

  .control-panel.is-open { transform: translateY(0); }
}

@media (max-width: 390px) {
  .range-row {
    grid-template-columns: 62px minmax(0, 1fr) 30px;
    gap: 7px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .control-panel,
  .icon-button,
  .panel-reveal,
  .scene-nav a,
  .panel-actions button {
    transition: none;
  }
}