/* CSS Custom Properties for theming */
:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f0f23;
  --fg-primary: #eaeaea;
  --fg-secondary: #a0a0b0;
  --fg-muted: #606070;
  --accent-primary: #00d4aa;
  --accent-secondary: #0099cc;
  --accent-danger: #ff4757;
  --accent-warning: #ffa502;
  --border-color: #2a2a4a;
  --card-bg: rgba(22, 33, 62, 0.9);
  --glass-bg: rgba(15, 15, 35, 0.8);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.4);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* Light mode */
@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8e8ed;
    --fg-primary: #1d1d1f;
    --fg-secondary: #6e6e73;
    --fg-muted: #9e9ea3;
    --accent-primary: #00a878;
    --accent-secondary: #0071e3;
    --accent-danger: #d1242f;
    --accent-warning: #b44700;
    --border-color: #d2d2d7;
    --card-bg: rgba(255, 255, 255, 0.9);
    --glass-bg: rgba(245, 245, 247, 0.8);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--fg-primary);
  min-height: 100vh;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
}

/* App Container */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
  gap: 1.5rem;
}

/* Header */
.header {
  text-align: center;
  padding: 1rem 0;
}

.header h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--fg-secondary);
  font-size: 1.1rem;
  font-weight: 400;
}

/* Main */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 100%;
}

/* Video Wrapper */
.video-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-width: 800px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-tertiary);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.video-wrapper video,
.video-wrapper canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-wrapper video {
  z-index: 1;
  transform: rotateY(180deg); /* Mirror for selfie view */
}

.video-wrapper canvas {
  z-index: 2;
  pointer-events: none;
}

/* Overlay Messages */
.overlay-message {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--fg-primary);
  text-align: center;
  padding: 2rem;
  z-index: 10;
  gap: 1rem;
}

.overlay-message.hidden {
  display: none;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.overlay-message .hint {
  color: var(--fg-secondary);
  font-size: 0.9rem;
}

/* Controls */
.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
  background: var(--card-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--fg-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.control-group select,
.control-group input[type='range'] {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--fg-primary);
  font-family: inherit;
  font-size: 1rem;
  padding: 0.75rem 1rem;
  transition: var(--transition);
}

.control-group select:focus,
.control-group input[type='range']:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.2);
}

.control-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23a0a0b0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 3rem;
}

.control-group input[type='range'] {
  padding: 0.5rem 0;
  -webkit-appearance: none;
  appearance: none;
}

.control-group input[type='range']::-webkit-slider-runnable-track {
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
}

.control-group input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  margin-top: -7px;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(0, 212, 170, 0.4);
}

.control-group input[type='range']::-webkit-slider-thumb:hover {
  transform: scale(1.15);
  box-shadow: 0 4px 12px rgba(0, 212, 170, 0.6);
}

.control-group input[type='range']::-moz-range-track {
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  border: none;
}

.control-group input[type='range']::-moz-range-thumb {
  width: 20px;
  height: 20px;
  background: var(--accent-primary);
  border-radius: 50%;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}

/* Buttons */
.button-group {
  display: flex;
  gap: 1rem;
  grid-column: 1 / -1;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  min-width: 160px;
  justify-content: center;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: var(--bg-primary);
  box-shadow: 0 4px 16px rgba(0, 212, 170, 0.3);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 212, 170, 0.4);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--fg-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--border-color);
  transform: translateY(-2px);
}

.btn-icon {
  font-size: 1.1em;
}

/* Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  grid-column: 1 / -1;
  padding-top: 0.5rem;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 1rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.stat:hover {
  border-color: var(--accent-primary);
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-primary);
}

/* Footer */
.footer {
  text-align: center;
  padding: 1.5rem 0;
  color: var(--fg-muted);
  font-size: 0.85rem;
}

.footer a {
  color: var(--accent-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.footer a:hover {
  color: var(--accent-primary);
  text-decoration: underline;
}

.privacy {
  margin-top: 0.5rem;
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 768px) {
  .app-container {
    padding: 1rem;
    gap: 1rem;
  }

  .controls {
    grid-template-columns: 1fr;
    padding: 1rem;
  }

  .button-group {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .stat-value {
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 1.75rem;
  }

  .controls {
    padding: 0.75rem;
  }

  .stat {
    padding: 0.75rem 0.5rem;
  }

  .stat-value {
    font-size: 1.1rem;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  :root {
    --border-color: currentColor;
    --shadow: none;
  }

  .control-group select,
  .control-group input[type='range'],
  .btn-secondary {
    border-width: 2px;
  }
}

/* Focus visible for accessibility */
*:focus-visible {
  outline: 3px solid var(--accent-primary);
  outline-offset: 2px;
}

button:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 3px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-tertiary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--fg-muted);
}