:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #07101f;
  color: #e5eefc;
  --border: #26364d;
  --muted: #8fa4bf;
  --panel: #101c2d;
  --accent: #42b6ff;
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: radial-gradient(circle at top, #142440 0, #07101f 44rem); }
button, input, select { font: inherit; }
a { color: #8bd2ff; }
h1, h2, h3, p { margin-top: 0; }

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  align-items: center;
  padding: 1.25rem 2rem;
  border-bottom: 1px solid var(--border);
  background: rgb(7 16 31 / 82%);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 5;
}
.topbar h1 { margin: 0; font-size: clamp(1.35rem, 3vw, 2rem); }
.eyebrow { margin-bottom: .3rem; color: #64c5ff; font-size: .72rem; font-weight: 800; letter-spacing: .13em; text-transform: uppercase; }
.dataset-state { display: grid; justify-items: end; gap: .35rem; color: var(--muted); }

.layout { display: grid; grid-template-columns: 17rem minmax(0, 1fr); min-height: calc(100vh - 5rem); }
.scene-browser { padding: 1.4rem; border-right: 1px solid var(--border); background: rgb(9 20 37 / 76%); }
.scene-browser label { display: block; margin: 1rem 0 .35rem; color: var(--muted); font-size: .82rem; }
.scene-browser input { width: 100%; padding: .65rem .75rem; color: inherit; background: #081525; border: 1px solid var(--border); border-radius: .55rem; }
.scene-browser > strong { display: block; margin: .8rem 0; color: var(--muted); font-size: .85rem; }
.scene-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: .35rem; max-height: 65vh; overflow: auto; }
.scene-button { padding: .45rem; color: #c9d7ea; background: #101f34; border: 1px solid transparent; border-radius: .4rem; cursor: pointer; }
.scene-button:hover, .scene-button.active { border-color: var(--accent); color: #fff; background: #153453; }
.footnote { margin-top: 1rem; color: var(--muted); font-size: .75rem; line-height: 1.5; }

main { min-width: 0; padding: 1.5rem clamp(1rem, 3vw, 2.5rem) 3rem; }
.scene-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; }
.scene-heading h2 { margin-bottom: .4rem; }
.scene-meta { color: var(--muted); text-align: right; }
.player { border: 1px solid var(--border); border-radius: .8rem; overflow: hidden; background: #030810; box-shadow: 0 1.2rem 3rem rgb(0 0 0 / 28%); }
.player.is-empty { opacity: .55; }
.media-labels { display: grid; grid-template-columns: 1fr 1fr; padding: .65rem 1rem; color: var(--muted); font-size: .78rem; background: #0d1929; }
.media-labels span:last-child { padding-left: 1rem; border-left: 1px solid var(--border); }
.video-stage { position: relative; aspect-ratio: 3 / 1; }
.video-stage video, .video-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.video-stage video { object-fit: contain; background: #000; }
.video-stage canvas { pointer-events: none; }
.transport { display: grid; grid-template-columns: auto minmax(8rem, 1fr) auto auto; gap: .85rem; align-items: center; padding: .8rem 1rem; border-top: 1px solid var(--border); background: #0d1929; }
.transport button, .transport select { padding: .42rem .7rem; color: inherit; background: #162840; border: 1px solid var(--border); border-radius: .45rem; }
.transport label { color: var(--muted); font-size: .78rem; }
.timeline-wrap { position: relative; }
.timeline-wrap input { width: 100%; }
.event-markers { position: absolute; inset: -.1rem .45rem auto; height: .4rem; pointer-events: none; }
.event-marker { position: absolute; width: .22rem; height: .5rem; border-radius: 1rem; background: #ff6b8b; transform: translateX(-50%); }

.inspection-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1rem; }
.panel { padding: 1rem; border: 1px solid var(--border); border-radius: .7rem; background: var(--panel); }
.panel h3 { margin-bottom: .9rem; }
.object-legend { display: grid; gap: .55rem; }
.object-row { display: grid; grid-template-columns: .75rem 2.5rem 1fr; gap: .55rem; align-items: center; }
.swatch { width: .72rem; height: .72rem; border-radius: 50%; box-shadow: 0 0 0 2px #05070a; }
.interaction-list { display: grid; gap: .6rem; }
.interaction { display: grid; gap: .18rem; padding: .65rem; border-left: .2rem solid #ff6b8b; background: #162337; }
.interaction span, .quiet { color: var(--muted); }
.error-message { min-height: 1.4rem; margin-top: 1rem; color: #ff8ba3; }

@media (max-width: 850px) {
  .topbar { align-items: start; padding: 1rem; }
  .dataset-state { justify-items: start; }
  .layout { grid-template-columns: 1fr; }
  .scene-browser { border-right: 0; border-bottom: 1px solid var(--border); }
  .scene-list { grid-template-columns: repeat(5, 1fr); max-height: 10rem; }
  .inspection-grid { grid-template-columns: 1fr; }
  .transport { grid-template-columns: auto 1fr auto; }
  .transport label { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .topbar, .scene-heading { display: grid; }
  .scene-meta { text-align: left; }
  .scene-list { grid-template-columns: repeat(3, 1fr); }
  .media-labels { font-size: .65rem; }
  .transport { grid-template-columns: auto 1fr; }
  .transport output { grid-column: 1 / -1; }
}