:root {
  --bg: #05060f;
  --neon: #4fd6ff;
  --neon2: #b14cff;
  --accent: #22e0d0;
  --danger: #ff3b6b;
  --text: #e8f2ff;
  --muted: #7f93b5;
  --panel: rgba(10, 14, 30, 0.82);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, system-ui, -apple-system, sans-serif;
  overflow: hidden;
  -webkit-user-select: none;
  user-select: none;
}

#app { position: fixed; inset: 0; }

#scene-container { position: absolute; inset: 0; }
#scene-container canvas { display: block; }

/* ---------------- HUD ---------------- */
#hud {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 10;
}

.hud-corner { position: absolute; padding: 18px 22px; }
.hud-tl { top: 0; left: 0; }
.hud-tr { top: 0; right: 0; display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
.hud-bl { bottom: 0; left: 0; }
.hud-br { bottom: 0; right: 0; display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }

.score-box { display: flex; flex-direction: column; line-height: 1; }
.score-label {
  font-size: 12px; letter-spacing: 4px; color: var(--muted); font-weight: 700;
}
#score {
  font-size: 54px; font-weight: 800;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 18px rgba(79, 214, 255, 0.75);
  color: #fff;
}
.best-box {
  margin-top: 8px; font-size: 13px; letter-spacing: 2px; color: var(--muted); font-weight: 700;
}
.best-box span { color: var(--neon); }

#webcam-preview {
  position: relative;
  width: 190px;
  height: 143px;
  border-radius: 12px;
  overflow: hidden;
  border: 2px solid rgba(79, 214, 255, 0.5);
  box-shadow: 0 0 24px rgba(79, 214, 255, 0.25), inset 0 0 30px rgba(0,0,0,0.6);
  background: #000;
}
#webcam-preview canvas { width: 100% !important; height: 100% !important; display: block; }
.cam-scanline {
  position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(rgba(79,214,255,0.06), rgba(79,214,255,0) 40%, rgba(79,214,255,0) 60%, rgba(79,214,255,0.06));
}

.detected {
  display: flex; align-items: center; gap: 8px;
  font-size: 11px; letter-spacing: 2px; font-weight: 700; color: var(--muted);
  background: rgba(0,0,0,0.4); padding: 5px 10px; border-radius: 20px;
  border: 1px solid rgba(127,147,181,0.3);
}
.detected .dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: #2b3350; transition: all .2s;
}
.detected.ok .dot { background: #2fe08a; box-shadow: 0 0 10px #2fe08a; }
.detected.ok #detected-text { color: #2fe08a; }
.detected.bad .dot { background: var(--danger); box-shadow: 0 0 10px var(--danger); }
.detected.bad #detected-text { color: var(--danger); }

#pose-pill {
  display: flex; align-items: baseline; gap: 10px;
  padding: 10px 18px; border-radius: 14px;
  background: var(--panel);
  border: 1px solid rgba(79,214,255,0.35);
  box-shadow: 0 0 24px rgba(0,0,0,0.5);
  transition: border-color .15s, box-shadow .15s, transform .1s;
}
#pose-pill.active { transform: scale(1.04); }
#pose-pill.mismatch { border-color: var(--danger); box-shadow: 0 0 26px rgba(255,59,107,0.5); }
.pose-pill-label { font-size: 11px; letter-spacing: 3px; color: var(--muted); font-weight: 700; }
#pose-name { font-size: 26px; font-weight: 800; letter-spacing: 1px; }
.pose-conf { font-size: 12px; color: var(--muted); font-weight: 700; }

.stat { font-size: 13px; letter-spacing: 2px; color: var(--muted); font-weight: 700; display: flex; gap: 10px; align-items: baseline; }
.stat b { color: var(--text); font-size: 18px; font-variant-numeric: tabular-nums; }

.warning {
  position: absolute; top: 12%; left: 50%; transform: translateX(-50%);
  color: var(--danger); font-weight: 800; letter-spacing: 3px; font-size: 18px;
  padding: 10px 22px; border-radius: 12px;
  background: rgba(255,59,107,0.12); border: 1px solid var(--danger);
  animation: pulse 1s infinite;
}
@keyframes pulse { 50% { opacity: .35; } }

/* upcoming poses preview (Tetris-style NEXT box on the left) */
.hud-left {
  position: absolute; left: 0; top: 168px;
  padding: 0 0 0 22px;
}
#upcoming {
  display: flex; flex-direction: column; align-items: stretch; gap: 9px;
  padding: 14px 16px 16px;
  border-radius: 16px;
  background: var(--panel);
  border: 1px solid rgba(127,147,181,0.32);
  box-shadow: 0 0 30px rgba(0,0,0,0.55);
}
.upcoming-label {
  font-size: 11px; letter-spacing: 4px; color: var(--muted); font-weight: 800;
  text-align: center;
}
#upcoming-list { display: flex; flex-direction: column; gap: 9px; }
.upcoming-chip {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px; border-radius: 12px;
  font-size: 15px; font-weight: 800; letter-spacing: 1.5px; color: var(--text);
  background: color-mix(in srgb, var(--c) 18%, transparent);
  border: 1px solid color-mix(in srgb, var(--c) 60%, transparent);
  box-shadow: 0 0 16px color-mix(in srgb, var(--c) 30%, transparent);
  transition: transform .15s, box-shadow .15s;
}
.upcoming-chip.first { transform: scale(1.06); box-shadow: 0 0 24px color-mix(in srgb, var(--c) 55%, transparent); }
.upcoming-chip .chip-dot {
  width: 13px; height: 13px; border-radius: 4px; background: var(--c);
  box-shadow: 0 0 12px var(--c);
}
.upcoming-chip.dim { opacity: 0.62; }

@media (max-width: 640px) {
  .hud-left { top: 138px; padding-left: 14px; }
  #upcoming { padding: 10px 12px 12px; }
  .upcoming-chip { padding: 8px 12px; font-size: 13px; }
}

#flash {
  position: absolute; inset: 0; z-index: 15; pointer-events: none;
  background: radial-gradient(circle at 50% 60%, rgba(255,59,107,0) 30%, rgba(255,59,107,0.55) 100%);
  opacity: 0; transition: opacity .12s;
}
#flash.on { opacity: 1; transition: opacity .04s; }

/* ---------------- SCREENS ---------------- */
#screens { position: absolute; inset: 0; z-index: 20; pointer-events: none; }
.screen {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  pointer-events: auto;
  background: radial-gradient(ellipse at 50% 40%, rgba(20,30,60,0.55), rgba(3,4,10,0.92));
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.screen.hidden { display: none; }

.panel {
  width: min(440px, 92vw);
  background: var(--panel);
  border: 1px solid rgba(79,214,255,0.25);
  border-radius: 22px;
  padding: 34px 34px 30px;
  text-align: center;
  box-shadow: 0 30px 80px rgba(0,0,0,0.6), 0 0 60px rgba(79,214,255,0.08) inset;
}
.panel.wide { width: min(660px, 94vw); }

.logo {
  margin: 0 0 12px;
  font-size: 40px; font-weight: 900; letter-spacing: 3px;
  background: linear-gradient(90deg, #4fd6ff, #b14cff 60%, #22e0d0);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 22px rgba(79,214,255,0.35));
}
.logo span { color: transparent; }
.logo.error-title { background: linear-gradient(90deg, #ff3b6b, #ff8c1a); -webkit-background-clip: text; background-clip: text; }
.logo.warn { background: linear-gradient(90deg, #ffd23b, #ff8c1a); -webkit-background-clip: text; background-clip: text; }

.tagline { color: var(--muted); font-size: 15px; line-height: 1.5; margin: 0 0 20px; }
.tagline b { color: var(--text); }

.legend {
  display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px;
  margin: 0 0 18px; text-align: left;
}
.legend-item { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
.legend-item b { color: var(--text); font-size: 12px; letter-spacing: 1px; width: 52px; }
.legend-item i { font-style: normal; font-size: 12px; }
.chip {
  width: 14px; height: 14px; border-radius: 4px; background: var(--c);
  box-shadow: 0 0 12px var(--c); flex: 0 0 auto;
}

.rules { text-align: left; color: var(--muted); font-size: 13px; line-height: 1.6; margin: 0 0 22px; padding-left: 18px; }
.rules b { color: var(--text); }

.btn {
  pointer-events: auto;
  display: inline-block;
  margin: 6px 6px 0;
  padding: 14px 26px;
  font-size: 15px; font-weight: 800; letter-spacing: 1.5px; text-transform: uppercase;
  color: var(--text);
  background: rgba(79,214,255,0.1);
  border: 1px solid rgba(79,214,255,0.5);
  border-radius: 12px;
  cursor: pointer;
  transition: transform .12s, box-shadow .12s, background .12s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(79,214,255,0.25); background: rgba(79,214,255,0.18); }
.btn:active { transform: translateY(0); }
.btn.primary {
  background: linear-gradient(90deg, rgba(79,214,255,0.9), rgba(34,224,208,0.9));
  color: #04121a; border: none;
  box-shadow: 0 12px 34px rgba(79,214,255,0.4);
}
.btn.ghost { background: transparent; border-color: rgba(127,147,181,0.4); color: var(--muted); }

.fineprint { font-size: 12px; color: var(--muted); margin: 16px 0 0; line-height: 1.5; }
kbd {
  background: rgba(127,147,181,0.2); border: 1px solid rgba(127,147,181,0.4);
  border-radius: 5px; padding: 1px 6px; font-size: 11px; color: var(--text);
}

/* countdown */
#countdown-number {
  font-size: 22vw; font-weight: 900; color: #fff;
  text-shadow: 0 0 60px rgba(79,214,255,0.9), 0 0 120px rgba(177,76,255,0.6);
  animation: cdpop .9s ease-out;
}
@keyframes cdpop { 0% { transform: scale(0.3); opacity: 0; } 40% { transform: scale(1.05); opacity: 1; } 100% { transform: scale(1); opacity: .9; } }

/* revive */
.squat-progress { display: flex; gap: 10px; justify-content: center; margin: 22px 0 10px; }
.squat-dot {
  width: 40px; height: 40px; border-radius: 12px;
  border: 2px solid rgba(127,147,181,0.4);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; color: var(--muted); font-size: 16px;
  transition: all .2s;
}
.squat-dot.done { background: linear-gradient(135deg, #ffd23b, #ff8c1a); border-color: transparent; color: #241300; box-shadow: 0 0 22px rgba(255,140,26,0.6); transform: scale(1.08); }
.squat-dot.active { border-color: #ffd23b; color: #ffd23b; box-shadow: 0 0 22px rgba(255,210,59,0.5); }
.squat-count { font-size: 30px; font-weight: 800; margin-bottom: 6px; }

.final-score {
  display: flex; flex-direction: column; gap: 2px; margin: 10px 0 4px;
}
.final-score span { font-size: 12px; letter-spacing: 4px; color: var(--muted); font-weight: 700; }
.final-score b { font-size: 60px; font-weight: 900; color: #fff; text-shadow: 0 0 26px rgba(79,214,255,0.7); font-variant-numeric: tabular-nums; }
.best-line { color: var(--muted); font-size: 14px; margin: 4px 0 18px; }
.best-line span { color: var(--neon); font-weight: 700; }

/* spinner */
.spinner {
  width: 46px; height: 46px; margin: 8px auto 18px;
  border: 4px solid rgba(79,214,255,0.15);
  border-top-color: var(--neon);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.hidden { display: none !important; }

@media (max-width: 640px) {
  #score { font-size: 38px; }
  #webcam-preview { width: 130px; height: 98px; }
  #pose-name { font-size: 20px; }
  .legend { grid-template-columns: 1fr; }
}