:root {
  --bg: #0b0f14;
  --panel: #131922;
  --panel-2: #1a2230;
  --border: #243042;
  --text: #e6edf6;
  --muted: #8a98a9;
  --accent: #3ddc97;
  --accent-2: #4aa8ff;
  --danger: #ff5d6c;
  --warn: #ffb454;
  --good: #3ddc97;
  --ok: #ffb454;
  --bad: #ff5d6c;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 600px at 80% -10%, #15233a 0%, transparent 60%), var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

.app-header {
  padding: 24px 24px 6px;
  text-align: center;
}
.app-header h1 {
  margin: 0;
  font-size: 26px;
  letter-spacing: 0.3px;
}
.subtitle {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.app-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 380px);
  gap: 20px;
  max-width: 1100px;
  margin: 14px auto;
  padding: 0 18px 28px;
  align-items: start;
}

@media (max-width: 900px) {
  .app-main {
    grid-template-columns: 1fr;
  }
  .panel { width: 100%; max-width: 520px; margin: 0 auto; }
}

.stage {
  display: flex;
  justify-content: center;
  min-width: 0;
}

/* Portrait preview frame at 3:4 — matches the 4:3 native sensor aspect of
   every iPhone camera (rotated to portrait), so `cover` crops only a few
   percent of the horizontal frame and preserves the full vertical FOV.
   Width is the limiting factor: never wider than the parent, a sensible
   portrait cap (440px), or the width that corresponds to 78vh of height. */
.video-wrap {
  position: relative;
  width: min(440px, 100%, calc(78vh * 3 / 4));
  aspect-ratio: 3 / 4;
  background: #05070a;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

@media (max-width: 900px) {
  .video-wrap {
    width: min(100%, calc(72vh * 3 / 4));
  }
}

.media-layer {
  position: absolute;
  inset: 0;
}
.media-layer.mirror {
  transform: scaleX(-1);
}

/* `object-fit: cover` fills the 3:4 portrait frame by cropping the sides
   of the 4:3 sensor frame. Because the stream is already 4:3 (native
   sensor aspect), the crop is minimal (~6 %) and the full vertical FOV
   is preserved — matching what the native Camera app shows in portrait. */
#video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
#overlay {
  position: absolute;
  pointer-events: none;
  /* width/height/left/top set dynamically by alignCanvasToVideo */
}

.overlay-hud {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  gap: 8px;
  z-index: 3;
}

.hud-pill {
  background: rgba(8, 12, 18, 0.7);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  backdrop-filter: blur(6px);
}
.hud-idle { color: var(--muted); }
.hud-live { color: var(--accent); border-color: rgba(61, 220, 151, 0.4); }
.hud-error { color: var(--danger); border-color: rgba(255, 93, 108, 0.4); }

/* Pose data overlay — left side of the preview, semi-transparent, smaller font. */
.pose-overlay {
  position: absolute;
  top: 50%;
  left: 10px;
  transform: translateY(-50%);
  z-index: 3;
  width: 132px;
  padding: 10px 10px 8px;
  background: rgba(8, 12, 18, 0.6);
  border: 1px solid var(--border);
  border-radius: 12px;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-size: 10px;
  color: var(--text);
}
.pose-overlay.hidden { display: none; }
.pose-overlay-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px;
  margin-bottom: 6px;
}
.pose-overlay-score {
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.pose-overlay-score.tone-good { color: var(--good); }
.pose-overlay-score.tone-ok   { color: var(--ok); }
.pose-overlay-score.tone-bad  { color: var(--bad); }
.pose-overlay-meta {
  text-align: right;
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--muted);
  line-height: 1.4;
}
.pose-overlay-stage { font-weight: 700; color: var(--text); }
.pose-overlay-count { display: block; margin-top: 2px; }
.pose-overlay-count span:last-child {
  color: var(--text);
  font-weight: 700;
  margin-left: 3px;
}
.pose-overlay-checks {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.pose-overlay-check {
  display: grid;
  grid-template-columns: 56px 1fr 22px;
  gap: 4px;
  align-items: center;
  font-size: 9px;
}
.pose-overlay-check-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--muted);
}
.pose-overlay-check-bar {
  height: 4px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  overflow: hidden;
}
.pose-overlay-check-fill {
  height: 100%;
  transition: width 0.2s ease;
}
.pose-overlay-check-fill.fill-good { background: var(--good); }
.pose-overlay-check-fill.fill-ok   { background: var(--ok); }
.pose-overlay-check-fill.fill-bad  { background: var(--bad); }
.pose-overlay-check-pct {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}

.permission-gate {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--text);
  background: radial-gradient(circle at center, rgba(36, 48, 66, 0.6) 0%, rgba(5, 7, 10, 0.85) 70%);
  z-index: 4;
  padding: 24px;
  font-size: 14px;
  line-height: 1.5;
}
.permission-gate p { margin: 0; }
.permission-gate strong { color: var(--accent); }
.permission-gate.hidden { display: none; }

.start-link {
  color: var(--accent);
  font-weight: 700;
  text-decoration: underline;
  cursor: pointer;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.panel-section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: var(--shadow);
}
.panel-section h2 {
  margin: 0 0 10px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
}

.camera-select {
  width: 100%;
  appearance: none;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 32px 10px 12px;
  font-size: 13px;
  cursor: pointer;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M1 1l4 4 4-4' stroke='%238a98a9' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat: no-repeat;
  background-position: right 12px center;
}
.camera-select:disabled { opacity: 0.5; cursor: default; }

.exercise-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.ex-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 10px 10px;
  border-radius: 10px;
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, transform 0.05s;
  text-align: left;
}
.ex-btn:hover { border-color: var(--accent-2); }
.ex-btn:active { transform: translateY(1px); }
.ex-btn.active {
  border-color: var(--accent);
  background: rgba(61, 220, 151, 0.12);
  box-shadow: 0 0 0 1px var(--accent) inset;
}
.ex-btn .ex-name { display: block; font-weight: 600; }
.ex-btn .ex-hint { display: block; font-size: 11px; color: var(--muted); margin-top: 2px; }

.coach-text {
  font-size: 14px;
  line-height: 1.45;
  color: var(--text);
  min-height: 40px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 13px;
  cursor: pointer;
  flex: 1 1 110px;
  transition: border-color 0.15s, background 0.15s;
}
.btn:hover { border-color: var(--accent-2); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #06241a;
  font-weight: 700;
}
.btn-primary:hover { filter: brightness(1.05); }
.btn-primary:disabled { opacity: 0.6; cursor: default; }
.btn:disabled { opacity: 0.5; cursor: default; }

.tips {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}
.tips li { margin-bottom: 4px; }

.error-box {
  background: rgba(255, 93, 108, 0.12);
  border: 1px solid rgba(255, 93, 108, 0.4);
  color: #ffd5da;
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 13px;
}

.app-footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 8px 0 24px;
}