/* ========================================
   DROWSINESS DETECTION — VANILLA CSS
   Dark theme + glassmorphism + animations
   ======================================== */

/* --- CSS Variables --- */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(20, 20, 35, 0.85);
  --border-glass: rgba(255, 255, 255, 0.08);
  --text-primary: #e8e8ef;
  --text-secondary: #8888a0;
  --text-muted: #55556a;
  --green: #00e676;
  --green-glow: rgba(0, 230, 118, 0.3);
  --orange: #ff9100;
  --orange-glow: rgba(255, 145, 0, 0.3);
  --red: #ff1744;
  --red-glow: rgba(255, 23, 68, 0.4);
  --accent: #7c4dff;
  --radius: 16px;
  --radius-sm: 10px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

/* --- Start Overlay --- */
.start-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--bg-primary);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.start-overlay.fade-out {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.start-overlay__content {
  text-align: center;
  padding: 40px;
  max-width: 420px;
  animation: fadeInUp 0.6s ease-out;
}

.start-overlay__icon {
  font-size: 3.5rem;
  margin-bottom: 16px;
  animation: pulse 2s ease-in-out infinite;
}

.start-overlay__title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.start-overlay__desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 28px;
}

.start-btn {
  padding: 14px 40px;
  border: none;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent), #651fff);
  color: #fff;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: 0 4px 20px rgba(124, 77, 255, 0.3);
}

.start-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(124, 77, 255, 0.45);
}

.start-btn:active {
  transform: translateY(0);
}

.start-overlay__note {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 16px;
}

/* --- Background grain --- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(124, 77, 255, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(0, 230, 118, 0.04) 0%, transparent 50%),
    radial-gradient(circle at 50% 80%, rgba(255, 23, 68, 0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* --- App Container --- */
.app {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 640px;
  padding: 20px;
  animation: fadeInUp 0.6s ease-out;
}

/* --- Header --- */
.header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  padding: 0 4px;
}

.header__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

.header__title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  flex: 1;
}

.header__badge {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 3px 10px;
  border-radius: 20px;
  background: rgba(255, 23, 68, 0.15);
  color: var(--red);
  animation: pulse 1.5s ease-in-out infinite;
}

/* --- Camera Card --- */
.camera-card {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  transition: box-shadow 0.5s ease;
}

.camera-card.state-open {
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.4),
    0 0 30px var(--green-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.camera-card.state-closing {
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.4),
    0 0 40px var(--orange-glow),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.camera-card.state-alarm {
  animation: alarmFlash 0.8s ease-in-out infinite;
}

#webcam, #overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scaleX(-1); /* mirror */
}

#webcam {
  z-index: 1;
}

#overlay {
  z-index: 2;
}

/* --- No face badge --- */
.no-face-badge {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: 20px;
  background: rgba(0, 0, 0, 0.6);
  color: var(--text-secondary);
  backdrop-filter: blur(8px);
  transition: opacity 0.3s ease;
}

/* --- Loading State --- */
.loading {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
}

.loading__spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-glass);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.loading__text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  animation: shimmer 1.5s ease-in-out infinite;
}

/* --- Error State --- */
.error-state {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
}

.error-state__icon {
  font-size: 2.5rem;
}

.error-state__text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-align: center;
  padding: 0 20px;
}

.btn {
  padding: 8px 24px;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-sm);
  background: rgba(124, 77, 255, 0.15);
  color: var(--accent);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn:hover {
  background: rgba(124, 77, 255, 0.25);
  box-shadow: 0 0 15px rgba(124, 77, 255, 0.2);
}

/* --- Status Panel --- */
.status-panel {
  margin-top: 16px;
  padding: 16px 20px;
  border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  animation: fadeInUp 0.6s ease-out 0.15s both;
}

.status-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.status-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: all 0.3s ease;
}

.status-indicator.open {
  background: var(--green);
  box-shadow: 0 0 10px var(--green-glow);
  animation: pulseGreen 1.5s ease-in-out infinite;
}

.status-indicator.closing {
  background: var(--orange);
  box-shadow: 0 0 10px var(--orange-glow);
  animation: pulseOrange 0.8s ease-in-out infinite;
}

.status-indicator.alarm {
  background: var(--red);
  box-shadow: 0 0 14px var(--red-glow);
  animation: pulseRed 0.4s ease-in-out infinite;
}

.status-label {
  font-size: 0.9rem;
  font-weight: 600;
  flex: 1;
  transition: color 0.3s ease;
}

.ear-value {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* --- Progress Bar --- */
.progress-track {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-bar {
  height: 100%;
  width: 0%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--orange), var(--red));
  transition: width 0.2s linear;
}

.timer-text {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* --- Footer --- */
.footer {
  text-align: center;
  margin-top: 16px;
  padding: 0 4px;
  animation: fadeInUp 0.6s ease-out 0.3s both;
}

.footer p {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* --- Utility --- */
.hidden {
  display: none !important;
}

/* ========================================
   KEYFRAME ANIMATIONS
   ======================================== */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes pulseGreen {
  0%, 100% { box-shadow: 0 0 8px var(--green-glow); }
  50% { box-shadow: 0 0 18px var(--green-glow); }
}

@keyframes pulseOrange {
  0%, 100% { box-shadow: 0 0 8px var(--orange-glow); }
  50% { box-shadow: 0 0 20px var(--orange-glow); }
}

@keyframes pulseRed {
  0%, 100% { box-shadow: 0 0 10px var(--red-glow); }
  50% { box-shadow: 0 0 24px var(--red-glow); }
}

@keyframes alarmFlash {
  0%, 100% {
    box-shadow:
      0 8px 32px rgba(0, 0, 0, 0.4),
      0 0 30px var(--red-glow),
      inset 0 1px 0 rgba(255, 255, 255, 0.05);
  }
  50% {
    box-shadow:
      0 8px 32px rgba(0, 0, 0, 0.4),
      0 0 60px var(--red-glow),
      0 0 100px rgba(255, 23, 68, 0.15),
      inset 0 1px 0 rgba(255, 255, 255, 0.05);
  }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes shimmer {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 480px) {
  .app {
    padding: 12px;
  }

  .header__title {
    font-size: 1.05rem;
  }

  .camera-card {
    border-radius: 12px;
  }

  .status-panel {
    padding: 12px 14px;
    border-radius: 12px;
  }

  .status-label {
    font-size: 0.82rem;
  }
}