:root {
  --bg: #f6f7f9; --card: #ffffff; --ink: #1d2330; --muted: #667085; --line: #e4e7ec;
  --accent: #0f6fde; --ok: #12805c; --warn: #b54708; --bad: #c01048;
  --knee: #0f6fde; --torso: #d97706;
  font-family: "Noto Sans TC", system-ui, -apple-system, "PingFang TC", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1218; --card: #171b23; --ink: #e6e9ef; --muted: #98a2b3; --line: #2a303b;
    --accent: #4c9bff; --ok: #3ccb8c; --warn: #f5a524; --bad: #ff5c8a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-size: 15px; }
.bar { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between;
  padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 2; }
.bar h1 { font-size: 18px; margin: 0; }
.controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
label { color: var(--muted); font-size: 13px; display: inline-flex; gap: 6px; align-items: center; }
select, input, button { font: inherit; color: var(--ink); background: var(--card); border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 10px; }
button { cursor: pointer; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.ghost { background: transparent; }
button:disabled { opacity: .45; cursor: not-allowed; }
main { display: grid; grid-template-columns: minmax(0, 1fr) 400px; gap: 16px; padding: 16px; }
@media (max-width: 980px) { main { grid-template-columns: 1fr; } }
.video-wrap { position: relative; background: #000; border-radius: 12px; overflow: hidden; aspect-ratio: 16 / 9; }
.video-wrap video, .video-wrap canvas { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; }
.video-wrap.calibrating canvas { cursor: crosshair; }
.badge { position: absolute; left: 10px; top: 10px; background: rgba(0,0,0,.6); color: #fff; padding: 4px 10px; border-radius: 999px; font-size: 13px; }
.calib-hint { position: absolute; left: 50%; bottom: 12px; transform: translateX(-50%); background: var(--accent); color: #fff; padding: 6px 12px; border-radius: 8px; }
.trend { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; margin-top: 12px; }
.trend-head { display: flex; justify-content: space-between; align-items: baseline; }
.trend h3 { margin: 0 0 6px; font-size: 14px; }
.trend canvas { width: 100%; height: 150px; display: block; }
.legend { color: var(--muted); font-size: 12px; display: flex; gap: 6px; align-items: center; }
.legend i { width: 14px; height: 3px; display: inline-block; margin-left: 8px; }
.legend i.k { background: var(--knee); } .legend i.t { background: var(--torso); }
.side { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.card h2 { font-size: 15px; margin: 0 0 8px; display: flex; justify-content: space-between; align-items: baseline; }
.card h2 small { color: var(--muted); font-weight: normal; }
.metrics { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.metrics td { padding: 5px 4px; border-bottom: 1px solid var(--line); }
.metrics td.v { text-align: right; font-weight: 600; font-size: 17px; }
.metrics td.r { color: var(--muted); font-size: 12px; text-align: right; }
.st-ok { color: var(--ok); } .st-low, .st-high { color: var(--bad); } .st-unknown { color: var(--muted); }
.trust { font-size: 11px; padding: 1px 6px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); white-space: nowrap; }
.hint { color: var(--muted); font-size: 12px; margin: 6px 0; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin: 8px 0; }
.row input { flex: 1; min-width: 120px; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.grid label { flex-direction: column; align-items: stretch; gap: 3px; }
.grid label.wide { grid-column: 1 / -1; }
.rec { border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; margin: 8px 0; }
.rec.change { border-color: var(--accent); }
.rec .title { display: flex; justify-content: space-between; gap: 8px; font-weight: 600; }
.rec .what { font-size: 16px; margin: 4px 0; }
.rec.change .what { color: var(--accent); }
.rec .why, .rec .couple { color: var(--muted); font-size: 12px; }
.warn { color: var(--warn); font-size: 12px; }
table.snaps { width: 100%; border-collapse: collapse; font-size: 12px; font-variant-numeric: tabular-nums; }
table.snaps th, table.snaps td { border-bottom: 1px solid var(--line); padding: 4px; text-align: right; }
table.snaps th:first-child, table.snaps td:first-child { text-align: left; }
.about ol { padding-left: 18px; color: var(--muted); font-size: 13px; }
.about summary { cursor: pointer; font-weight: 600; }

body.view-front .side-only, body:not(.view-front) .front-only { display: none; }
.area-rec td.base { color: var(--muted); }
.better { color: var(--ok); } .worse { color: var(--bad); }