:root {
  --paper: #eceae4;
  --ink: #15171a;
  --ink-soft: rgba(21, 23, 26, 0.55);
  --ink-faint: rgba(21, 23, 26, 0.22);
  --accent: #b2432f; /* the one red dot: shutter */
  --serif: 'Instrument Serif', 'Times New Roman', serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --gutter: clamp(16px, 3.2vw, 44px);
}

:root[data-theme='dusk'] {
  --ink: #f3ede4;
  --ink-soft: rgba(243, 237, 228, 0.62);
  --ink-faint: rgba(243, 237, 228, 0.25);
}

:root[data-theme='night'] {
  --paper: #05070b;
  --ink: #d9e2ef;
  --ink-soft: rgba(217, 226, 239, 0.55);
  --ink-faint: rgba(217, 226, 239, 0.2);
  --accent: #e0775e;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
}

#stage, #stage canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}

.plate {
  position: fixed;
  z-index: 2;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 1.4s ease, transform 1.4s ease, color 0.8s ease;
  pointer-events: none;
}
.ready .plate { opacity: 1; transform: none; }
.ready .plate--meta { transition-delay: 0.25s; }
.ready .plate--controls { transition-delay: 0.5s; }
.ready .plate--credit { transition-delay: 0.75s; }
.hide-ui .plate { opacity: 0 !important; pointer-events: none !important; }

/* Title — top left, like a print label */
.plate--title { top: var(--gutter); left: var(--gutter); }
.kicker {
  margin: 0 0 0.6rem;
  font-size: 10.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(28px, 3.4vw, 46px);
  line-height: 1;
  letter-spacing: -0.01em;
}
h1 em { font-style: italic; }

/* Exposure data — top right, EXIF-like */
.plate--meta { top: var(--gutter); right: var(--gutter); }
.plate--meta dl {
  margin: 0;
  display: grid;
  gap: 0.35rem;
  font-size: 10.5px;
  letter-spacing: 0.08em;
}
.plate--meta dl > div { display: flex; justify-content: flex-end; gap: 1.2rem; }
.plate--meta dt { color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.2em; }
.plate--meta dd { margin: 0; min-width: 7.5ch; text-align: right; font-variant-numeric: tabular-nums; }
#meta-fps { color: var(--ink-soft); }

/* Controls — bottom right, a single hairline row */
.plate--controls {
  right: var(--gutter);
  bottom: var(--gutter);
  display: flex;
  align-items: center;
  gap: 0;
  pointer-events: auto;
  border-top: 1px solid var(--ink-faint);
  padding-top: 0.7rem;
}

.control {
  appearance: none;
  background: none;
  border: 0;
  color: var(--ink);
  font: inherit;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.35rem 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  white-space: nowrap;
  transition: color 0.3s ease, opacity 0.3s ease;
}
.control + .control { border-left: 1px solid var(--ink-faint); }
.control:first-child { padding-left: 0; }
.control:last-child { padding-right: 0; }
.control__name { color: var(--ink-soft); }
button.control:hover, button.control:focus-visible { color: var(--accent); outline: none; }

.control--range { cursor: default; }
.control__value { min-width: 4.2ch; text-align: right; font-variant-numeric: tabular-nums; }

input[type='range'] {
  appearance: none;
  width: clamp(90px, 11vw, 150px);
  height: 18px;
  background: transparent;
  cursor: ew-resize;
}
input[type='range']::-webkit-slider-runnable-track { height: 1px; background: var(--ink); }
input[type='range']::-moz-range-track { height: 1px; background: var(--ink); }
input[type='range']::-webkit-slider-thumb {
  appearance: none;
  width: 9px;
  height: 9px;
  margin-top: -4px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--ink);
}
input[type='range']::-moz-range-thumb {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--paper); border: 1px solid var(--ink);
}
input[type='range']:focus-visible { outline: 1px dotted var(--ink-soft); outline-offset: 4px; }

.shutter-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  transition: background 0.2s ease, transform 0.2s ease;
}
.control--shutter.is-on .shutter-dot { background: var(--accent); transform: scale(1.15); }
.control--shutter.is-on { color: var(--accent); }

/* Credit — bottom left */
.plate--credit {
  left: var(--gutter);
  bottom: var(--gutter);
  max-width: 34ch;
  font-size: 11px;
  line-height: 1.55;
}
.plate--credit p { margin: 0; }
.plate--credit em { font-family: var(--serif); font-size: 14px; letter-spacing: 0.01em; }
.hint { margin-top: 0.4rem !important; color: var(--ink-soft); font-size: 10px; letter-spacing: 0.04em; }

/* Frozen: a thin frame appears, as if the plate had been exposed */
body::after {
  content: '';
  position: fixed;
  inset: calc(var(--gutter) * 0.45);
  border: 1px solid var(--ink-faint);
  opacity: 0;
  transition: opacity 0.6s ease;
  pointer-events: none;
  z-index: 1;
}
body.frozen::after { opacity: 1; }

/* No WebGPU */
.fallback {
  display: none;
  position: fixed;
  inset: 0;
  place-content: center;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.06em;
  z-index: 3;
}
.fallback em { font-family: var(--serif); font-size: 28px; letter-spacing: 0; }
.no-webgpu .fallback { display: grid; }
.no-webgpu .plate { display: none; }

@media (max-width: 760px) {
  .plate--meta { display: none; }
  .plate--credit { bottom: auto; top: calc(var(--gutter) + 5.2rem); }
  .plate--credit .hint { display: none; }
  .plate--controls {
    left: var(--gutter);
    right: var(--gutter);
    flex-wrap: wrap;
    row-gap: 0.4rem;
  }
  .control { padding: 0.35rem 0.6rem; }
  .control--range { width: 100%; padding-left: 0; border-left: 0 !important; }
  .control--range input { flex: 1; }
  .control--range + .control { border-left: 0; padding-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .plate { transition: none; transform: none; }
}