:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1d232b;
  --muted: #5d6875;
  --border: #d9dee4;
  --primary: #2780e3;
  --primary-text: #ffffff;
  --good: #1e9e55;
  --warn: #d79b00;
  --bad: #d63b3b;
  --left: #f28c28;
  --right: #2f9be8;
  --stage: #111418;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14181d;
    --surface: #1d232b;
    --text: #e6e9ed;
    --muted: #9aa5b1;
    --border: #333c47;
    --primary: #4a9df0;
  }
}

:root[data-theme="dark"] {
  --bg: #14181d;
  --surface: #1d232b;
  --text: #e6e9ed;
  --muted: #9aa5b1;
  --border: #333c47;
  --primary: #4a9df0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Noto Sans Thai", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding: 10px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.topbar h1 { font-size: 1.15rem; margin: 0; flex: 1; }
.back { color: var(--primary); text-decoration: none; white-space: nowrap; }

.pill {
  font-size: 0.85rem;
  padding: 2px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
}
.pill.ok { border-color: var(--good); color: var(--good); }
.pill.err { border-color: var(--bad); color: var(--bad); }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 16px;
  padding: 16px;
  max-width: 1400px;
  margin: 0 auto;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}

.mode-tabs { display: flex; gap: 4px; margin-bottom: 8px; }
.tab {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 8px 8px 0 0;
  font: inherit;
  cursor: pointer;
}
.tab.active { background: var(--primary); color: var(--primary-text); border-color: var(--primary); }

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 10px;
  margin-bottom: 10px;
}
.controls label { display: flex; flex-direction: column; font-size: 0.85rem; color: var(--muted); }
.controls label.check { flex-direction: row; align-items: center; gap: 6px; color: var(--text); }

.file-pick input { display: none; }
.file-pick span {
  display: inline-block;
  padding: 9px 14px;
  border: 1px dashed var(--primary);
  border-radius: 8px;
  color: var(--primary);
  cursor: pointer;
}

.btn {
  font: inherit;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  min-height: 42px;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
.btn.recording { background: var(--bad); border-color: var(--bad); color: #fff; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

select, input[type="text"] {
  font: inherit;
  padding: 7px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  width: 100%;
}

.stage {
  position: relative;
  background: var(--stage);
  border-radius: 10px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}
.stage canvas { max-width: 100%; max-height: 100%; display: block; }
.stage canvas.mirrored { transform: scaleX(-1); }
.placeholder { position: absolute; color: #c7ced6; padding: 16px; text-align: center; }
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
  font-weight: 600;
  color: #fff;
  background: rgba(0, 0, 0, 0.35);
}

.statusbar { display: flex; gap: 12px; align-items: center; margin-top: 8px; flex-wrap: wrap; }
.statusbar progress { flex: 1; min-width: 120px; }
.muted { color: var(--muted); }
.privacy { font-size: 0.85rem; color: var(--muted); margin: 6px 0 0; }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 12px;
}
.panel summary { font-weight: 600; cursor: pointer; }
.panel h2 { font-size: 1rem; margin: 0 0 6px; }
.panel label { display: block; margin-top: 8px; font-size: 0.9rem; }
.panel label.check { display: flex; gap: 6px; align-items: center; }
.panel input[type="text"] { margin-top: 4px; }
.tip { font-size: 0.82rem; color: var(--muted); margin: 6px 0 0; }

.vis-list { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 12px; }
.vis-item { font-size: 0.82rem; }
.vis-bar { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.vis-bar > div { height: 100%; width: 0; background: var(--bad); }
.vis-bar > div.good { background: var(--good); }
.vis-bar > div.warn { background: var(--warn); }

.angle-list { display: grid; grid-template-columns: auto 1fr 1fr; gap: 2px 10px; font-size: 0.9rem; }
.angle-list .h { font-weight: 600; font-size: 0.8rem; color: var(--muted); }
.angle-list .l { color: var(--left); font-variant-numeric: tabular-nums; }
.angle-list .r { color: var(--right); font-variant-numeric: tabular-nums; }

.result dl { display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; margin: 0; font-size: 0.9rem; }
.result dt { color: var(--muted); }
.result dd { margin: 0; }
.warnings { padding-left: 18px; color: var(--bad); font-size: 0.88rem; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* Safari บน iOS ไม่อัปเดตเฟรมของ video ที่ซ่อนด้วย display:none จึงย่อให้เล็กและโปร่งใสแทน */
.offscreen { position: absolute; width: 2px; height: 2px; opacity: 0; pointer-events: none; left: 0; top: 0; }

/* ภาพสำหรับเทียบกับ Kinovea (ส่วนล่างของหน้า) */
.samples {
  max-width: 1400px;
  margin: 0 auto 24px;
  padding: 12px 16px 16px;
  background: var(--surface);
  border-top: 1px solid var(--border);
}
.samples-head { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; }
.samples-head h2 { font-size: 1.05rem; margin: 0; flex: 1 1 100%; }
.samples-head label { display: flex; flex-direction: column; font-size: 0.85rem; color: var(--muted); min-width: 200px; }
.sample-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 10px;
  margin: 10px 0;
}
.sample {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  background: var(--bg);
}
.sample:hover, .sample:focus-visible { outline: 2px solid var(--primary); }
.sample img { width: 100%; display: block; aspect-ratio: 16 / 9; object-fit: contain; background: var(--stage); }
.sample figcaption { font-size: 0.8rem; padding: 4px 8px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 2px 6px; }
.sample .mp-angle { font-weight: 600; color: var(--primary); }
.sample.saved figcaption::after { content: "✓ บันทึกแล้ว"; color: var(--good); }