:root {
  --bg: #0b0a0e;
  --fg: #d8d2dc;
  --fg-dim: #6f6776;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --panel-width: 300px;
  --panel-bg: rgba(8, 6, 12, 0.56);
  --panel-blur: 14px;
  --panel-fg: #e8e2ea;
  --panel-dim: #8a8190;
  --panel-faint: #564f5c;
  --panel-line: rgba(255, 255, 255, 0.12);
  --panel-cell: rgba(10, 8, 14, 0.82);
  --panel-active: rgba(255, 255, 255, 0.09);
  --panel-line-strong: rgba(255, 255, 255, 0.34);
  --panel-accent: #f4e6d4;
  --panel-font: var(--font-mono);
  --panel-size: 11px;
  --panel-size-small: 10px;
  --panel-tracking: 0.06em;
  --panel-pad: 20px;
  --panel-gap: 22px;
  --panel-radius: 0;
  --panel-ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --toggle-size: 32px;
  --toggle-opacity: 0.38;
  --toggle-glow: rgba(244, 230, 212, 0.18);
  --caption-color: #cfc7d3;
  --caption-size: 11px;
  --caption-tracking: 0.28em;
  --caption-in: 0.5s;
  --caption-out: 1.4s;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  overflow: hidden;
}
#gl {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  display: block;
  touch-action: none;
}
.fallback {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem;
  font-family: var(--font-mono);
  color: var(--fg-dim);
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.06em;
}
.fallback[hidden] { display: none; }
.fallback__title {
  margin: 0;
  color: var(--fg);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}
.fallback__text { margin: 0; }
.panel-toggle {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 3;
  height: var(--toggle-size);
  display: flex;
  align-items: center;
  padding: 0;
  background: transparent;
  border: 1px solid var(--panel-line);
  border-radius: var(--panel-radius);
  color: var(--panel-fg);
  font-family: var(--panel-font);
  font-size: var(--panel-size-small);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: var(--toggle-opacity);
  cursor: pointer;
  transition: opacity 0.4s ease, border-color 0.4s ease;
}
.panel-toggle__icon {
  width: calc(var(--toggle-size) - 2px);
  height: calc(var(--toggle-size) - 2px);
  display: grid;
  place-items: center;
  flex: none;
}
.panel-toggle svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1;
}
.panel-toggle__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: 0;
  overflow: hidden;
  white-space: nowrap;
  opacity: 0;
  transition: max-width 0.6s var(--panel-ease), opacity 0.4s ease, padding 0.6s var(--panel-ease);
}
.panel-toggle__key {
  border: 1px solid var(--panel-line-strong);
  padding: 0 4px;
  letter-spacing: 0;
}
.panel-toggle:hover,
.panel-toggle:focus-visible,
.panel-toggle.is-open,
.panel-toggle.is-hinting {
  opacity: 0.95;
  border-color: var(--panel-line-strong);
}
.panel-toggle:hover .panel-toggle__label,
.panel-toggle:focus-visible .panel-toggle__label,
.panel-toggle.is-hinting .panel-toggle__label {
  max-width: 14em;
  padding-left: 12px;
  opacity: 1;
}
.panel-toggle.is-open .panel-toggle__label {
  max-width: 0;
  padding-left: 0;
  opacity: 0;
}
.panel-toggle.is-hinting {
  animation: toggle-breathe 2.4s ease-in-out infinite;
}
@keyframes toggle-breathe {
  0%, 100% { box-shadow: 0 0 0 0 var(--toggle-glow); }
  50% { box-shadow: 0 0 18px 1px var(--toggle-glow); }
}
@media (prefers-reduced-motion: reduce) {
  .panel-toggle.is-hinting { animation: none; }
}
.panel {
  position: fixed;
  top: 16px;
  right: 16px;
  bottom: calc(16px + var(--toggle-size) + 12px);
  z-index: 2;
  width: min(var(--panel-width), calc(100vw - 32px));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--panel-pad);
  background: var(--panel-bg);
  -webkit-backdrop-filter: blur(var(--panel-blur));
  backdrop-filter: blur(var(--panel-blur));
  border: 1px solid var(--panel-line);
  border-radius: var(--panel-radius);
  color: var(--panel-fg);
  font-family: var(--panel-font);
  font-size: var(--panel-size);
  letter-spacing: var(--panel-tracking);
  line-height: 1.5;
  opacity: 0;
  transform: translateX(12px);
  pointer-events: none;
  transition: opacity 0.35s var(--panel-ease), transform 0.35s var(--panel-ease);
  scrollbar-width: thin;
  scrollbar-color: var(--panel-line) transparent;
}
.panel.is-open {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
.panel button {
  font: inherit;
  letter-spacing: inherit;
}
.panel [hidden] { display: none !important; }
.panel__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--panel-line);
}
.panel__title {
  text-transform: uppercase;
  letter-spacing: 0.22em;
}
.panel__hint {
  color: var(--panel-faint);
  border: 1px solid var(--panel-line);
  padding: 0 5px;
  font-size: var(--panel-size-small);
}
.panel__section {
  padding: var(--panel-gap) 0 0;
}
.panel__label {
  margin: 0 0 12px;
  font-size: var(--panel-size-small);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--panel-dim);
}
.desc {
  margin: 6px 0 0;
  font-size: var(--panel-size-small);
  color: var(--panel-dim);
  line-height: 1.45;
  letter-spacing: 0.02em;
}
.shapes {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--panel-line);
  border: 1px solid var(--panel-line);
}
.shape {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 10px 2px 7px;
  background: var(--panel-cell);
  border: 0;
  cursor: pointer;
  color: var(--panel-dim);
  transition: color 0.2s ease, background 0.2s ease;
}
.shape:hover { color: var(--panel-fg); }
.shape[aria-pressed="true"] {
  color: var(--panel-accent);
  background: var(--panel-active);
  box-shadow: inset 0 -1px 0 var(--panel-accent);
}
.shape__icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1;
}
.shape__icon svg .fill {
  fill: currentColor;
  stroke: none;
}
.shape__name {
  font-size: 9px;
  letter-spacing: 0.04em;
}
.palettes {
  display: grid;
  gap: 6px;
}
.palette {
  display: grid;
  grid-template-columns: 1fr 12ch;
  align-items: center;
  gap: 12px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  color: var(--panel-dim);
  text-align: left;
}
.palette__swatch {
  display: block;
  height: 10px;
  border: 1px solid transparent;
  outline: 1px solid transparent;
  outline-offset: 2px;
  transition: outline-color 0.2s ease;
}
.palette__name {
  white-space: nowrap;
}
.palette:hover { color: var(--panel-fg); }
.palette[aria-pressed="true"] { color: var(--panel-accent); }
.palette[aria-pressed="true"] .palette__swatch { outline-color: var(--panel-accent); }
.row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 12px;
}
.link {
  padding: 0;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--panel-line-strong);
  cursor: pointer;
  color: var(--panel-fg);
}
.palette__custom {
  color: var(--panel-accent);
  font-size: var(--panel-size-small);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}
.editor {
  margin-top: 14px;
}
.editor__track {
  position: relative;
  padding-bottom: 16px;
}
.editor__bar {
  height: 20px;
  border: 1px solid var(--panel-line-strong);
  cursor: copy;
}
.editor__stops {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 0;
}
.stop {
  position: absolute;
  top: 24px;
  width: 11px;
  height: 11px;
  margin-left: -6px;
  padding: 0;
  background: var(--stop);
  border: 1px solid var(--panel-fg);
  border-radius: 0;
  cursor: grab;
  touch-action: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.stop::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 100%;
  width: 1px;
  height: 4px;
  background: var(--panel-fg);
}
.stop:active { cursor: grabbing; }
.stop.is-removing {
  opacity: 0.3;
  transform: scale(0.7);
}
.editor__color {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
.segs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--panel-line);
}
.seg {
  padding: 7px 0;
  background: none;
  border: 0;
  cursor: pointer;
  color: var(--panel-dim);
}
.seg + .seg { border-left: 1px solid var(--panel-line); }
.seg[aria-pressed="true"] {
  color: var(--panel-accent);
  background: var(--panel-active);
  box-shadow: inset 0 -1px 0 var(--panel-accent);
}
.seg:disabled {
  cursor: default;
  color: var(--panel-faint);
  background: none;
}
.slider + .slider { margin-top: 16px; }
.slider__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.slider__value {
  color: var(--panel-accent);
  font-variant-numeric: tabular-nums;
}
.slider__input {
  -webkit-appearance: none;
  appearance: none;
  display: block;
  width: 100%;
  height: 18px;
  margin: 2px 0 0;
  background: transparent;
  cursor: pointer;
}
.slider__input::-webkit-slider-runnable-track {
  height: 1px;
  background: var(--panel-line-strong);
}
.slider__input::-moz-range-track {
  height: 1px;
  background: var(--panel-line-strong);
}
.slider__input::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 9px;
  height: 9px;
  margin-top: -4px;
  background: var(--panel-accent);
  border: 0;
  border-radius: 0;
}
.slider__input::-moz-range-thumb {
  width: 9px;
  height: 9px;
  background: var(--panel-accent);
  border: 0;
  border-radius: 0;
}
.slider__input:focus-visible { outline: 1px solid var(--panel-line-strong); outline-offset: 2px; }
.panel__foot {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: var(--panel-gap);
  padding-top: 16px;
  border-top: 1px solid var(--panel-line);
}
.action {
  padding: 8px 0;
  color: var(--panel-fg);
  background: none;
  border: 1px solid var(--panel-line-strong);
  border-radius: var(--panel-radius);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  transition: background 0.2s ease;
}
.action:hover { background: rgba(255, 255, 255, 0.06); }
.panel :focus-visible { outline: 1px solid var(--panel-accent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  .panel { transition: opacity 0.2s linear; transform: none; }
}
.caption {
  position: fixed;
  left: 16px;
  bottom: 16px;
  z-index: 1;
  height: var(--toggle-size);
  display: flex;
  align-items: center;
  font-family: var(--panel-font);
  font-size: var(--caption-size);
  letter-spacing: var(--caption-tracking);
  text-transform: uppercase;
  color: var(--caption-color);
  opacity: 0;
  transform: translateY(4px);
  pointer-events: none;
  transition: opacity var(--caption-out) ease, transform var(--caption-out) ease;
}
.caption.is-visible {
  opacity: 0.8;
  transform: none;
  transition: opacity var(--caption-in) ease, transform var(--caption-in) var(--panel-ease);
}
@media (prefers-reduced-motion: reduce) {
  .caption,
  .caption.is-visible { transform: none; }
}