/* ============================================
   TruthLens - Modern Design System
   ============================================ */

:root {
  /* Colors */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-card: rgba(26, 26, 40, 0.6);

  --color-text-primary: #ffffff;
  --color-text-secondary: #b4b4c8;
  --color-text-muted: #6b6b80;

  --color-accent-primary: #8b5cf6;
  --color-accent-secondary: #06b6d4;
  --color-accent-success: #10b981;
  --color-accent-danger: #ef4444;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-danger: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  --gradient-glow: radial-gradient(circle, rgba(139, 92, 246, 0.3) 0%, transparent 70%);

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px rgba(139, 92, 246, 0.4);

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Fonts */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'Courier New', monospace;
}

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

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* ============================================
   Animated Background
   ============================================ */

.animated-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.3;
  animation: float 20s ease-in-out infinite;
}

.orb-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #8b5cf6 0%, transparent 70%);
  top: -10%;
  left: -10%;
  animation-delay: 0s;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #06b6d4 0%, transparent 70%);
  top: 50%;
  right: -10%;
  animation-delay: 7s;
}

.orb-3 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, #8b5cf6 0%, transparent 70%);
  bottom: -10%;
  left: 50%;
  animation-delay: 14s;
}

@keyframes float {

  0%,
  100% {
    transform: translate(0, 0) scale(1);
  }

  33% {
    transform: translate(30px, -30px) scale(1.1);
  }

  66% {
    transform: translate(-20px, 20px) scale(0.9);
  }
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(139, 92, 246, 0.1);
  padding: 1rem 0;
  animation: slideDown 0.5s ease-out;
}

@keyframes slideDown {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  font-size: 1.75rem;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.1);
  }
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-tagline {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* ============================================
   Container & Layout
   ============================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* ============================================
   Hero Section
   ============================================ */

.hero-section {
  text-align: center;
  padding: var(--spacing-3xl) 0;
  animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
}

.gradient-text {
  display: block;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 3s ease-in-out infinite;
  background-size: 200% 200%;
}

@keyframes shimmer {

  0%,
  100% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }
}

.hero-subtitle {
  display: block;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 300;
  color: var(--color-text-secondary);
}

.hero-description {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-2xl);
  line-height: 1.8;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-2xl);
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  padding: var(--spacing-lg);
  background: rgba(139, 92, 246, 0.05);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(139, 92, 246, 0.2);
  min-width: 120px;
  transition: all var(--transition-normal);
}

.stat-item:hover {
  transform: translateY(-5px);
  background: rgba(139, 92, 246, 0.1);
  border-color: rgba(139, 92, 246, 0.4);
  box-shadow: var(--shadow-glow);
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

/* ============================================
   Glass Card
   ============================================ */

.glass-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  animation: fadeInUp 0.6s ease-out;
}

.glass-card:hover {
  border-color: rgba(139, 92, 246, 0.4);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}

/* ============================================
   Upload Section
   ============================================ */

.upload-section {
  margin: var(--spacing-2xl) 0;
}

.upload-card {
  overflow: hidden;
}

.upload-tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  border-bottom: 2px solid rgba(139, 92, 246, 0.1);
}

.tab-btn {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--color-text-muted);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.tab-icon {
  font-size: 1.25rem;
}

.tab-btn:hover {
  color: var(--color-text-primary);
  background: rgba(139, 92, 246, 0.05);
}

.tab-btn.active {
  color: var(--color-accent-primary);
  border-bottom-color: var(--color-accent-primary);
  background: rgba(139, 92, 246, 0.1);
}

.tab-content {
  display: none;
  animation: fadeIn 0.4s ease-out;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

/* ============================================
   Upload Zone
   ============================================ */

.upload-zone {
  position: relative;
  padding: var(--spacing-3xl);
  border: 2px dashed rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-lg);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  background: rgba(139, 92, 246, 0.02);
}

.upload-zone:hover {
  border-color: var(--color-accent-primary);
  background: rgba(139, 92, 246, 0.05);
  transform: translateY(-2px);
}

.upload-zone.drag-over {
  border-color: var(--color-accent-secondary);
  background: rgba(6, 182, 212, 0.1);
  transform: scale(1.02);
}

.upload-icon-wrapper {
  position: relative;
  display: inline-block;
  margin-bottom: var(--spacing-lg);
}

.upload-icon {
  font-size: 4rem;
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-10px);
  }
}

.upload-pulse {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--gradient-glow);
  animation: pulsate 2s ease-in-out infinite;
  z-index: -1;
}

@keyframes pulsate {

  0%,
  100% {
    transform: translate(-50%, -50%) scale(1);
    opacity: 0.5;
  }

  50% {
    transform: translate(-50%, -50%) scale(1.5);
    opacity: 0;
  }
}

.upload-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.upload-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.upload-specs {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.spec-divider {
  color: var(--color-accent-primary);
}

#fileInput {
  display: none;
}

/* ============================================
   YouTube Input
   ============================================ */

.youtube-input-container {
  padding: var(--spacing-xl);
  text-align: center;
}

.youtube-icon-wrapper {
  margin-bottom: var(--spacing-lg);
}

.youtube-icon {
  font-size: 4rem;
  display: inline-block;
  animation: float 3s ease-in-out infinite;
}

.youtube-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.youtube-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

.url-input-group {
  display: flex;
  gap: var(--spacing-sm);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.youtube-url-input {
  flex: 1;
  padding: var(--spacing-md) var(--spacing-lg);
  background: rgba(26, 26, 40, 0.6);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-size: 0.875rem;
  font-family: var(--font-mono);
  transition: all var(--transition-normal);
}

.youtube-url-input:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  background: rgba(26, 26, 40, 0.8);
  box-shadow: 0 0 20px rgba(139, 92, 246, 0.3);
}

.youtube-url-input::placeholder {
  color: var(--color-text-muted);
}

.youtube-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  max-width: 700px;
  margin: 0 auto;
}

.info-box {
  padding: var(--spacing-lg);
  background: rgba(139, 92, 246, 0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(139, 92, 246, 0.2);
  text-align: left;
}

.info-box.warning {
  background: rgba(239, 68, 68, 0.05);
  border-color: rgba(239, 68, 68, 0.2);
}

.info-title {
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.info-list div {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  padding: var(--spacing-xs) 0;
}

.info-text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ============================================
   Sections
   ============================================ */

.video-section,
.fft-section,
.results-section,
.info-section {
  margin: var(--spacing-2xl) 0;
}

.section-header {
  margin-bottom: var(--spacing-xl);
}

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.title-icon {
  font-size: 2rem;
}

.hidden {
  display: none !important;
}

/* ============================================
   Video Player
   ============================================ */

.video-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--spacing-lg);
}

.video-container video,
#youtubePlayerContainer {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.video-controls {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  box-shadow: var(--shadow-md), 0 0 20px rgba(139, 92, 246, 0.4);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(139, 92, 246, 0.1);
  color: var(--color-accent-primary);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.btn-secondary:hover {
  background: rgba(139, 92, 246, 0.2);
  border-color: var(--color-accent-primary);
}

.btn-large {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: 1rem;
}

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

.btn-icon {
  font-size: 1.25rem;
}

/* ============================================
   FFT Visualization
   ============================================ */

.fft-canvas-container {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: var(--spacing-lg);
}

#fftCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.spinner-wrapper {
  position: relative;
  width: 80px;
  height: 80px;
  margin-bottom: var(--spacing-lg);
}

.spinner {
  width: 100%;
  height: 100%;
  border: 4px solid rgba(139, 92, 246, 0.2);
  border-top-color: var(--color-accent-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.spinner-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--gradient-glow);
  animation: pulsate 2s ease-in-out infinite;
}

.loading-text {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.progress-container {
  width: 300px;
  max-width: 90%;
}

.progress-bar {
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  transition: width 0.3s ease;
}

.fft-legend {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: rgba(139, 92, 246, 0.05);
  border-radius: var(--radius-sm);
}

.legend-indicator {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.legend-item.real .legend-indicator {
  background: var(--color-accent-success);
  box-shadow: 0 0 10px var(--color-accent-success);
}

.legend-item.ai .legend-indicator {
  background: var(--color-accent-danger);
  box-shadow: 0 0 10px var(--color-accent-danger);
}

.legend-text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.legend-text strong {
  color: var(--color-text-primary);
}

/* ============================================
   Results
   ============================================ */

.result-badge-wrapper {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.result-badge {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-2xl);
  border-radius: var(--radius-xl);
  font-weight: 700;
  font-size: 1.5rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  animation: badgePulse 2s ease-in-out infinite;
}

.result-badge.ai-generated {
  background: var(--gradient-danger);
  box-shadow: 0 0 30px rgba(239, 68, 68, 0.4);
}

.result-badge.real-video {
  background: var(--gradient-success);
  box-shadow: 0 0 30px rgba(16, 185, 129, 0.4);
}

@keyframes badgePulse {

  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.05);
  }
}

.confidence-meter {
  margin: var(--spacing-xl) auto;
  max-width: 500px;
}

.confidence-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.confidence-number {
  font-weight: 700;
  font-size: 1.25rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.confidence-bar {
  position: relative;
  height: 16px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.confidence-fill {
  height: 100%;
  border-radius: var(--radius-xl);
  transition: width 1s ease-out;
  position: relative;
}

.confidence-glow {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

.result-explanation {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-xl);
  background: rgba(26, 26, 40, 0.4);
  border-radius: var(--radius-md);
}

.explanation-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

.details-list {
  list-style: none;
  padding-left: 0;
}

.details-list li {
  padding: var(--spacing-sm) 0;
  padding-left: var(--spacing-lg);
  position: relative;
  color: var(--color-text-secondary);
}

.details-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-accent-primary);
}

/* ============================================
   Info Section
   ============================================ */

.info-intro {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

.info-intro strong {
  color: var(--color-text-primary);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.info-card {
  padding: var(--spacing-xl);
  border-radius: var(--radius-md);
  border: 1px solid;
  transition: all var(--transition-normal);
}

.info-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.real-card {
  background: rgba(16, 185, 129, 0.05);
  border-color: rgba(16, 185, 129, 0.2);
}

.real-card:hover {
  border-color: rgba(16, 185, 129, 0.4);
  box-shadow: 0 8px 32px rgba(16, 185, 129, 0.2);
}

.ai-card {
  background: rgba(239, 68, 68, 0.05);
  border-color: rgba(239, 68, 68, 0.2);
}

.ai-card:hover {
  border-color: rgba(239, 68, 68, 0.4);
  box-shadow: 0 8px 32px rgba(239, 68, 68, 0.2);
}

.info-card-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.info-card h4 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.info-card ul {
  list-style: none;
  padding-left: 0;
}

.info-card li {
  padding: var(--spacing-xs) 0;
  padding-left: var(--spacing-lg);
  position: relative;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.info-card li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-accent-primary);
}

.info-note {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  font-style: italic;
  text-align: center;
}

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

.footer {
  margin-top: var(--spacing-3xl);
  padding: var(--spacing-2xl) 0;
  border-top: 1px solid rgba(139, 92, 246, 0.1);
}

.footer-content {
  text-align: center;
}

.footer-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.footer-text {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* ============================================
   Error Modal
   ============================================ */

.error-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.error-modal.visible {
  opacity: 1;
  pointer-events: all;
}

.error-modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(10px);
}

.error-modal-content {
  position: relative;
  background: rgba(26, 26, 40, 0.95);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  max-width: 500px;
  width: 90%;
  text-align: center;
  box-shadow: var(--shadow-lg), 0 0 40px rgba(239, 68, 68, 0.3);
  animation: modalSlideIn 0.4s ease-out;
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-30px) scale(0.95);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.error-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  animation: errorPulse 2s ease-in-out infinite;
}

@keyframes errorPulse {

  0%,
  100% {
    transform: scale(1);
    filter: drop-shadow(0 0 10px rgba(239, 68, 68, 0.5));
  }

  50% {
    transform: scale(1.1);
    filter: drop-shadow(0 0 20px rgba(239, 68, 68, 0.8));
  }
}

.error-title {
  color: var(--color-accent-danger);
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
}

.error-message {
  color: var(--color-text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-xl);
}

.error-close-btn {
  min-width: 120px;
}

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

@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .nav-tagline {
    font-size: 0.75rem;
  }

  .hero-stats {
    gap: var(--spacing-md);
  }

  .stat-item {
    min-width: 100px;
  }

  .upload-tabs {
    flex-direction: column;
    gap: 0;
  }

  .tab-btn {
    border-bottom: 1px solid rgba(139, 92, 246, 0.2);
    border-left: 3px solid transparent;
  }

  .tab-btn.active {
    border-left-color: var(--color-accent-primary);
    border-bottom-color: rgba(139, 92, 246, 0.2);
  }

  .url-input-group {
    flex-direction: column;
  }

  .youtube-info {
    grid-template-columns: 1fr;
  }

  .video-controls {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

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

/* ============================================
   Utilities
   ============================================ */

.mt-sm {
  margin-top: var(--spacing-sm);
}

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

.text-center {
  text-align: center;
}