/* ============================================
   YOLO26 Vision - Apple-Inspired Design System
   ============================================ */

:root {
  /* Light Theme */
  --bg-primary: #f5f5f7;
  --bg-secondary: #ffffff;
  --bg-tertiary: rgba(255, 255, 255, 0.72);
  --bg-glass: rgba(255, 255, 255, 0.65);
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --text-tertiary: #6e6e73;
  --border-color: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);

  /* Accent Colors */
  --accent-blue: #0071e3;
  --accent-blue-hover: #0077ed;
  --accent-green: #34c759;
  --accent-orange: #ff9500;
  --accent-red: #ff3b30;
  --accent-purple: #af52de;
  --accent-teal: #5ac8fa;
  --accent-pink: #ff2d55;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-warm: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-cool: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-primary: #000000;
  --bg-secondary: #1c1c1e;
  --bg-tertiary: rgba(28, 28, 30, 0.72);
  --bg-glass: rgba(28, 28, 30, 0.65);
  --text-primary: #f5f5f7;
  --text-secondary: #98989d;
  --text-tertiary: #8e8e93;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* ============================================
   Base Styles
   ============================================ */

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
  transition: background var(--transition-normal), color var(--transition-normal);
}

/* ============================================
   Loader
   ============================================ */

.loader {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.loader.visible {
  opacity: 1;
  visibility: visible;
}

.loader-content {
  text-align: center;
  max-width: 300px;
}

.loader-spinner {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-lg);
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loader-content p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--space-md);
}

.loader-progress {
  width: 200px;
  height: 4px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 0 auto;
}

.loader-bar {
  height: 100%;
  width: 0%;
  background: var(--accent-blue);
  border-radius: var(--radius-full);
  transition: width var(--transition-fast);
}

/* ============================================
   Container
   ============================================ */

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-lg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================
   Header
   ============================================ */

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
  margin-bottom: var(--space-lg);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo-icon {
  width: 32px;
  height: 32px;
  color: var(--accent-blue);
}

.logo h1 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.logo h1 span {
  font-weight: 300;
  color: var(--text-secondary);
}

.header-status {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-tertiary);
  transition: background var(--transition-fast);
}

.status-dot.ready { background: var(--accent-orange); }
.status-dot.loading { background: var(--accent-blue); animation: pulse 1s infinite; }
.status-dot.running { background: var(--accent-green); }
.status-dot.error { background: var(--accent-red); }

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

.icon-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover {
  background: var(--bg-secondary);
  transform: scale(1.05);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

#theme-toggle .sun-icon { display: block; }
#theme-toggle .moon-icon { display: none; }
[data-theme="dark"] #theme-toggle .sun-icon { display: none; }
[data-theme="dark"] #theme-toggle .moon-icon { display: block; }

/* ============================================
   Main Layout
   ============================================ */

.main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: var(--space-xl);
}

@media (max-width: 1024px) {
  .main {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Video Section
   ============================================ */

.video-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.video-container {
  position: relative;
  aspect-ratio: 4/3;
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
}

.video-container video,
.video-container canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-container video {
  z-index: 1;
}

.video-container canvas {
  z-index: 2;
}

.video-placeholder {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  color: var(--text-tertiary);
  transition: opacity var(--transition-normal);
}

.video-placeholder.hidden {
  opacity: 0;
  pointer-events: none;
}

.video-placeholder svg {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-md);
  opacity: 0.5;
}

.video-placeholder p {
  font-size: 0.9375rem;
}

/* Stats Bar */
.stats-bar {
  display: flex;
  gap: var(--space-md);
}

.stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-md);
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.stat-value {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

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

/* ============================================
   Controls Section
   ============================================ */

.controls-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.control-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.control-card h3 {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  margin-bottom: var(--space-md);
}

/* Model Grid */
.model-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
}

.model-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: var(--space-md);
  background: var(--bg-secondary);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.model-btn:hover {
  border-color: var(--border-color);
  transform: translateY(-2px);
}

.model-btn.active {
  border-color: var(--accent-blue);
  background: rgba(0, 113, 227, 0.08);
}

.model-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-primary);
}

.model-meta {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 2px;
}

/* Task Toggles */
.task-toggles {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.toggle-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.toggle-item:hover {
  background: var(--bg-tertiary);
}

.toggle-item.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.toggle-item input {
  display: none;
}

.toggle-switch {
  position: relative;
  width: 44px;
  height: 26px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast);
  flex-shrink: 0;
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  transition: transform var(--transition-fast);
}

.toggle-item input:checked + .toggle-switch {
  background: var(--accent-blue);
}

.toggle-item input:checked + .toggle-switch::after {
  transform: translateX(18px);
}

.toggle-content {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.toggle-content svg {
  width: 20px;
  height: 20px;
  color: var(--text-tertiary);
}

.toggle-content span {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* Slider */
.slider-container {
  padding: 0 var(--space-xs);
}

.slider {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: var(--border-color);
  border-radius: var(--radius-full);
  outline: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  background: white;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  background: white;
  border: none;
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  cursor: pointer;
}

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-sm);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.slider-current {
  color: var(--accent-blue);
  font-weight: 600;
}

/* Camera Controls */
.camera-controls {
  display: flex;
  gap: var(--space-sm);
}

.select {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast);
}

.select:focus {
  border-color: var(--accent-blue);
}

/* Start Button */
.start-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--accent-blue);
  border: none;
  border-radius: var(--radius-lg);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.start-btn:hover:not(:disabled) {
  background: var(--accent-blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 113, 227, 0.3);
}

.start-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.start-btn.running {
  background: var(--accent-red);
}

.start-btn.running:hover:not(:disabled) {
  box-shadow: 0 8px 24px rgba(255, 59, 48, 0.3);
}

.start-btn svg {
  width: 20px;
  height: 20px;
}

/* Info Card */
.info-card {
  padding: var(--space-lg);
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  color: white;
}

.info-card h4 {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.info-card p {
  font-size: 0.8125rem;
  opacity: 0.9;
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.info-tags {
  display: flex;
  gap: var(--space-xs);
}

.tag {
  padding: var(--space-xs) var(--space-sm);
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-sm);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  text-align: center;
  padding: var(--space-lg) 0;
  margin-top: var(--space-xl);
  border-top: 1px solid var(--border-color);
}

.footer p {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

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

.footer a:hover {
  text-decoration: underline;
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  .container {
    padding: var(--space-md);
  }

  .header {
    flex-wrap: wrap;
    gap: var(--space-md);
  }

  .main {
    gap: var(--space-md);
  }

  .video-container {
    aspect-ratio: 1;
  }

  .stats-bar {
    flex-wrap: wrap;
  }

  .stat {
    min-width: calc(33.333% - var(--space-sm));
  }

  .model-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.control-card {
  animation: fadeIn 0.4s ease backwards;
}

.control-card:nth-child(1) { animation-delay: 0.1s; }
.control-card:nth-child(2) { animation-delay: 0.2s; }
.control-card:nth-child(3) { animation-delay: 0.3s; }
.control-card:nth-child(4) { animation-delay: 0.4s; }