/* ── Reset & Variables ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #0a0a0a;
  --surface:      #111111;
  --surface-alt:  #0d0d0d;
  --border:       #1a1a1a;
  --accent-green: #00ff88;
  --accent-cyan:  #00ccff;
  --accent-red:   #ff3355;
  --accent-amber: #ffaa00;
  --text-primary: #e0e0e0;
  --text-dim:     #555555;
  --text-muted:   #333333;
  --radius:       4px;
}

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
  height: 100dvh;
  display: grid;
  grid-template-rows: 48px 1fr;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── Header ────────────────────────────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

#brand {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 6px;
  color: var(--accent-green);
}

#status-group {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  color: var(--text-dim);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  transition: background 0.3s, box-shadow 0.3s;
}

.dot.connected {
  background: var(--accent-green);
  box-shadow: 0 0 8px var(--accent-green);
}

.dot.disconnected {
  background: var(--accent-red);
  box-shadow: 0 0 6px rgba(255, 51, 85, 0.4);
}

.dot.loading {
  background: var(--accent-amber);
  box-shadow: 0 0 6px rgba(255, 170, 0, 0.4);
  animation: pulse 1.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

#fps-display {
  color: var(--text-muted);
  font-size: 10px;
  min-width: 60px;
  text-align: right;
}

/* ── Main Layout ───────────────────────────────────────────────────────── */
main {
  display: grid;
  grid-template-columns: 1fr 260px;
  height: 100%;
  overflow: hidden;
}

/* ── Video Panel ───────────────────────────────────────────────────────── */
#video-panel {
  position: relative;
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#webcam {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  transform: scaleX(-1);
}

#overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  transform: scaleX(-1);
}

#no-face {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 51, 85, 0.1);
  border: 1px solid rgba(255, 51, 85, 0.4);
  color: var(--accent-red);
  padding: 8px 20px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  border-radius: var(--radius);
  backdrop-filter: blur(4px);
}

.hidden { display: none !important; }

/* ── Vitals Panel ──────────────────────────────────────────────────────── */
#vitals-panel {
  background: var(--surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 16px;
  gap: 16px;
  overflow-y: auto;
}

/* ── Vital Card ────────────────────────────────────────────────────────── */
.vital-card {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px 16px;
  text-align: center;
  position: relative;
  transition: border-color 0.5s;
}

.vital-icon {
  font-size: 14px;
  margin-bottom: 4px;
  opacity: 0.4;
}

#card-hr .vital-icon { color: var(--accent-green); }
#card-spo2 .vital-icon { color: var(--accent-cyan); }

.vital-label {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--text-dim);
  margin-bottom: 10px;
}

.vital-value {
  font-size: 56px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -3px;
  transition: color 0.5s;
}

#card-hr .vital-value { color: var(--accent-green); }
#card-spo2 .vital-value { color: var(--accent-cyan); }

.vital-unit {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 2px;
  color: var(--text-dim);
  margin-top: 8px;
}

/* SpO2 alert state */
#card-spo2.alert {
  border-color: var(--accent-red);
}
#card-spo2.alert .vital-value {
  color: var(--accent-red);
}

/* ── Buffer Section ────────────────────────────────────────────────────── */
#buffer-section {
  padding: 0 4px;
}

#buffer-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

#buffer-label {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--text-dim);
}

#buffer-pct {
  font-size: 10px;
  color: var(--text-dim);
}

#buffer-track {
  height: 3px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

#buffer-bar {
  height: 100%;
  width: 0%;
  background: var(--accent-green);
  border-radius: 2px;
  transition: width 0.3s ease, background 0.5s;
}

/* ── Info Section ──────────────────────────────────────────────────────── */
#info-section {
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.info-row {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
}

.info-key { color: var(--text-dim); }
.info-val { color: var(--text-primary); }

/* ── Scrollbar ─────────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }