/* Plain document, after the clothing color demo: no cards, no shadows, no
   rounded corners, one accent. Everything is a hairline rule or plain text on a
   plain ground. */

:root {
  --bg:      #ffffff;
  --fg:      #16181a;
  --muted:   #62676d;
  --rule:    #d9dcdf;
  --field:   #f2f3f4;
  --accent:  #1c4f9c;
  --warn:    #9c4a1c;
  --ring-h:  #2f6fd0;
  --ring-v:  #cf4040;
  --lamp:    #f2b33d;
  --lamp-edge: #8a5d0c;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
          "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
          Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:     #121415;
    --fg:     #e6e8ea;
    --muted:  #949aa0;
    --rule:   #2c3033;
    --field:  #1b1e20;
    --accent: #7aa8e8;
    --warn:   #d99163;
    --ring-h: #6c9cf0;
    --ring-v: #ee6a6a;
    --lamp:   #f5c15a;
    --lamp-edge: #f5c15a;
  }
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
  max-width: 62rem;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1 {
  margin: 0 0 .6rem;
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

h2 {
  margin: 0 0 .5rem;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
}

p { margin: 0 0 .8rem; }

.sub { max-width: 46rem; color: var(--fg); }

.note {
  margin-top: .8rem;
  max-width: 34rem;
  font-size: .82rem;
  line-height: 1.55;
  color: var(--muted);
}

hr {
  margin: 2rem 0;
  border: 0;
  border-top: 1px solid var(--rule);
}

/* ── tabs ─────────────────────────────────────────────────────────────── */

nav {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin-bottom: 1rem;
}

nav .spacer { flex: 1; }
nav .group { display: inline-flex; gap: .4rem; }

.tab {
  padding: .4rem .95rem;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: .88rem;
  cursor: pointer;
}

.tab:hover { color: var(--fg); border-color: var(--fg); }
.tab:disabled { opacity: .45; cursor: default; }
.tab:disabled:hover { color: var(--muted); border-color: var(--rule); }

.tab[aria-pressed="true"] {
  color: var(--bg);
  background: var(--fg);
  border-color: var(--fg);
}

.status {
  min-height: 1.2rem;
  font-family: var(--mono);
  font-size: .8rem;
  color: var(--muted);
}

.status.err { color: var(--warn); }

/* ── layout ───────────────────────────────────────────────────────────── */

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 14rem;
  gap: 2rem 2.5rem;
  align-items: start;
}

/* ── source frame ─────────────────────────────────────────────────────── */

.frame {
  position: relative;
  display: block;
  width: 100%;
  min-height: 8rem;
  background: var(--field);
  border: 1px solid var(--rule);
  line-height: 0;
}

.frame video,
.frame img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 78vh;
  object-fit: contain;
}

#scene {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.empty {
  margin: 0;
  padding: 3.5rem 1.5rem;
  text-align: center;
  line-height: 1.5;
  font-size: .85rem;
  color: var(--muted);
}

/* ── lights ───────────────────────────────────────────────────────────── */

.lights {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

#toggle-details { align-self: flex-start; }

.gizmo {
  display: block;
  width: 100%;
  max-width: 11rem;
  aspect-ratio: 1;
  background: var(--bg);
  border: 1px solid var(--rule);
}

.details {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .1rem .8rem;
  margin: .6rem 0 0;
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--rule);
  font-size: .8rem;
  line-height: 1.45;
}

.details dt { color: var(--muted); }
.details dd { margin: 0; font-variant-numeric: tabular-nums; }

.warmbar {
  position: relative;
  display: inline-block;
  width: 4.2rem;
  height: .5rem;
  margin-right: .4rem;
  vertical-align: middle;
  background: linear-gradient(90deg, #7eacde, #d8d8d8, #ec9e54);
}

.warmbar i {
  position: absolute;
  top: -.2rem;
  width: 2px;
  height: .9rem;
  margin-left: -1px;
  background: var(--fg);
}

/* ── footer ───────────────────────────────────────────────────────────── */

.metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 0 2.5rem;
  margin: 0 0 1.2rem;
}

.metrics div { margin: 0; }

.metrics dt {
  font-size: .72rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
}

.metrics dd {
  margin: .1rem 0 0;
  font-family: var(--mono);
  font-size: .95rem;
  font-variant-numeric: tabular-nums;
}

.links {
  margin-top: 1.4rem;
  display: flex;
  gap: 1.5rem;
  font-size: .85rem;
}

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid currentColor; }
a:hover { color: var(--fg); }

/* ── narrow screens ─────────────────────────────────────────────────────── */

@media (max-width: 780px) {
  main { grid-template-columns: 1fr; }
  .lights { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
  .lights.detailed { grid-template-columns: 1fr; }
  .lights.detailed .light {
    display: grid;
    grid-template-columns: 7rem minmax(0, 1fr);
    column-gap: 1.2rem;
    align-items: start;
  }
  .lights.detailed .light h2 { grid-column: 1 / -1; }
  .lights.detailed .details { margin-top: 0; }
  #toggle-details { grid-column: 1 / -1; justify-self: start; }
}