:root {
  --bg: #14161a;
  --panel: #1d2026;
  --line: #2c313a;
  --fg: #e8eaee;
  --dim: #9aa3b0;
  --accent: #5cc8ff;
}

* { box-sizing: border-box; }

/* Any rule that sets display (e.g. .fallback{display:flex}) silently beats the UA
 * [hidden]{display:none} rule, so `hidden` must be enforced globally. */
[hidden] { display: none !important; }

body {
  margin: 0;
  padding: 1.5rem clamp(1rem, 4vw, 3rem) 4rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header { max-width: 1100px; margin: 0 auto 1.75rem; }
h1 { margin: 0 0 .25rem; font-size: 1.5rem; font-weight: 600; }
.intro, .hint { color: var(--dim); margin: .35rem 0; max-width: 70ch; }
.summary { color: var(--fg); margin: .35rem 0; font-variant-numeric: tabular-nums; }
.hint { font-size: .85rem; }

.warn {
  border: 1px solid #6b4a1f;
  background: #2a2113;
  color: #f0d9a8;
  border-radius: 8px;
  padding: .7rem .9rem;
  font-size: .9rem;
  margin-top: 1rem;
}

.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr));
  max-width: 1400px;
  margin: 0 auto;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.stage { position: relative; background: #000; aspect-ratio: 16 / 9; }
.stage video { width: 100%; height: 100%; display: block; object-fit: contain; background: #000; }

.fallback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  gap: .6rem;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1rem;
  background: rgba(12, 13, 16, .78);
  font-size: .9rem;
}
.fallback p { margin: 0; }
.fallback .why { font: .72rem/1.4 ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--dim); }

.body { padding: .9rem 1rem 1.1rem; display: flex; flex-direction: column; gap: .3rem; }
.label { font-size: 1rem; font-weight: 600; margin: 0; }
.note { margin: 0; color: var(--fg); font-size: .9rem; white-space: pre-line; }
.note:empty { display: none; }
.meta, .file { margin: 0; color: var(--dim); font-size: .82rem; font-variant-numeric: tabular-nums; }
.file code { font-size: .72rem; word-break: break-all; color: #7c8492; }
.file:has(code:empty) { display: none; }

.actions { display: flex; gap: .5rem; margin: .6rem 0 0; flex-wrap: wrap; }

.btn {
  appearance: none;
  border: 1px solid var(--line);
  background: #262b33;
  color: var(--fg);
  border-radius: 8px;
  padding: .45rem .8rem;
  font: inherit;
  font-size: .85rem;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f7f9; --panel: #fff; --line: #dcdfe4; --fg: #1b1e23; --dim: #5c6674; --accent: #0a6fb5;
  }
  .warn { background: #fff6e5; border-color: #e0c188; color: #6b4a1f; }
  .btn { background: #f0f2f5; }
  .stage, .stage video { background: #000; }
  .fallback { background: rgba(250, 250, 252, .85); }
}