:root {
  --bg: #0f1216; --panel: #171b21; --panel2: #1e232b; --line: #2a303a;
  --text: #e6e9ee; --muted: #8b94a3; --accent: #7c5cff; --uv: #b57bff;
  --ok: #2ecc71; --warn: #f5a623; --bad: #ff5c5c;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; }
header { display: flex; align-items: center; gap: 18px; padding: 10px 18px;
  border-bottom: 1px solid var(--line); background: var(--panel); flex-wrap: wrap; }
header .brand { font-weight: 700; letter-spacing: .3px; }
header .brand span { color: var(--muted); font-weight: 500; }
nav a { color: var(--muted); text-decoration: none; margin-right: 14px; }
nav a.active, nav a:hover { color: var(--text); }
.pills { margin-left: auto; display: flex; gap: 8px; flex-wrap: wrap; }
.pill { font-size: 12px; padding: 3px 9px; border-radius: 99px; background: var(--panel2);
  border: 1px solid var(--line); color: var(--muted); }
.pill.ok { color: var(--ok); border-color: #235c3b; }
.pill.warn { color: var(--warn); border-color: #6b4e17; }

.layout { display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 16px; padding: 16px; }
@media (max-width: 1000px) { .layout { grid-template-columns: 1fr; } }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px; }
.card h3 { margin: 0 0 10px; font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); }
.stack { display: flex; flex-direction: column; gap: 16px; }

.video { padding: 0; overflow: hidden; }
.video img { display: block; width: 100%; height: auto; max-height: min(78vh, 900px); background: #000; object-fit: contain; }
.toolbar { display: flex; gap: 8px; padding: 10px; border-top: 1px solid var(--line); flex-wrap: wrap; align-items: center; }
.toolbar .hint { color: var(--muted); font-size: 12px; margin-left: auto; }

button, .btn { background: var(--panel2); color: var(--text); border: 1px solid var(--line);
  padding: 7px 12px; border-radius: 8px; cursor: pointer; font: inherit; text-decoration: none; display: inline-block; }
button:hover, .btn:hover { border-color: #465063; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.danger { background: #3a1d1f; border-color: #6b2a2e; color: #ffb3b3; }
button:disabled { opacity: .5; cursor: default; }
input, select { background: var(--bg); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; padding: 7px 10px; font: inherit; }

.uv-top { display: flex; align-items: baseline; gap: 10px; }
.uv-value { font-size: 44px; font-weight: 700; font-variant-numeric: tabular-nums; }
.uv-unit { color: var(--muted); }
.badge { margin-left: auto; font-weight: 700; font-size: 12px; padding: 4px 10px; border-radius: 99px;
  background: var(--panel2); color: var(--muted); border: 1px solid var(--line); }
.badge.on { background: var(--uv); color: #1a0b2e; border-color: var(--uv); box-shadow: 0 0 18px #b57bff88; }
canvas.chart { width: 100%; height: 130px; display: block; margin-top: 8px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; font-size: 13px; }
.kv div:nth-child(odd) { color: var(--muted); }
table { width: 100%; border-collapse: collapse; font-size: 12px; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 4px 6px; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 500; }
.big-distance { font-size: 26px; font-weight: 700; color: #ffd166; }
.error { color: var(--bad); font-size: 12px; }
.toast { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); background: var(--panel2);
  border: 1px solid var(--line); padding: 8px 14px; border-radius: 8px; opacity: 0; transition: opacity .2s; pointer-events: none; }
.toast.show { opacity: 1; }

/* labeling page */
.label-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr) 280px; gap: 12px; padding: 12px; height: calc(100vh - 56px); }
@media (max-width: 1000px) { .label-layout { grid-template-columns: 1fr; height: auto; } }
.imglist { overflow-y: auto; }
.imglist .item { padding: 6px 8px; border-radius: 6px; cursor: pointer; font-size: 12px; display: flex; gap: 6px; align-items: center; }
.imglist .item:hover { background: var(--panel2); }
.imglist .item.sel { background: #2b2450; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--line); flex: none; }
.dot.done { background: var(--ok); }
.dot.sugg { background: var(--warn); }
.canvas-wrap { position: relative; background: #000; border-radius: 12px; overflow: hidden; min-height: 300px; }
#labelCanvas { width: 100%; height: 100%; display: block; cursor: crosshair; }
.classbtn { display: flex; align-items: center; gap: 8px; width: 100%; text-align: left; margin-bottom: 4px; }
.classbtn.sel { border-color: var(--accent); background: #2b2450; }
.swatch { width: 12px; height: 12px; border-radius: 3px; flex: none; }
.boxrow { display: flex; align-items: center; gap: 6px; font-size: 12px; padding: 3px 0; }
.boxrow.sel { color: #fff; font-weight: 600; }
.boxrow button { padding: 1px 7px; margin-left: auto; }
kbd { background: var(--panel2); border: 1px solid var(--line); border-radius: 4px; padding: 0 5px; font-size: 11px; }