:root {
  --bg: #0b0f1a;
  --panel: #121826;
  --card: #1f2937;
  --border: #2b3546;
  --text: #ecf0f4;
  --muted: #a9b3c7;
  --primary: #4f8cff;
  --danger: #ef4444;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, Inter, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.appbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(0deg, var(--panel), #0f1522);
}
.appbar h1 { font-size: 18px; margin: 0; }
.actions { display: flex; gap: 8px; }

.container {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 16px;
  padding: 16px;
}
@media (max-width: 980px) {
  .container { grid-template-columns: 1fr; }
}

.stage {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  position: relative;
}
#cam { position:absolute; width:1px; height:1px; left:-9999px; top:auto; opacity:0; }
#canvas {
  display:block;
  width: 100%;
  height: auto;
  background: #0a0e17;
  border-radius: 12px;
  border: 1px solid var(--border);
}
.controls {
  margin-top: 12px;
  display:flex;
  gap:8px;
  flex-wrap: wrap;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  max-height: calc(100dvh - 120px);
  overflow: auto;
}

details { border: 1px solid var(--border); border-radius: 10px; margin-bottom: 12px; }
summary { padding: 10px 12px; cursor: pointer; background: var(--card); border-radius: 10px 10px 0 0; }
details > div.grid { padding: 12px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
details > div.grid.grid-1 { grid-template-columns: 1fr; }
details label { display:flex; flex-direction: column; gap: 6px; font-size: 14px; }
.hint { color: var(--muted); font-size: 12px; }
.diag { white-space: pre-wrap; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; background:#0d1220; border:1px solid var(--border); border-radius:10px; padding:10px; color:#cfe1ff; }

.btn {
  appearance: none; border: 1px solid var(--border); background: var(--card);
  color: var(--text); padding: 8px 12px; border-radius: 10px; cursor: pointer;
}
.btn:hover { border-color: var(--primary); }
.btn.primary { background: var(--primary); color: #fff; border-color: transparent; }
.btn.secondary { background: #2a3344; }
.btn.danger { background: var(--danger); border-color: transparent; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }

#uploadStatus { margin-top: 10px; color: var(--muted); font-size: 14px; }
#videoLink a { color: var(--primary); }

.foot {
  padding: 16px;
  color: var(--muted);
  border-top: 1px solid var(--border);
}