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

:root {
  /* Gradients */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --accent-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --glow-gradient: linear-gradient(90deg, #667eea, #764ba2, #f093fb, #f5576c);
  
  /* Colors */
  --primary: #667eea;
  --secondary: #2c3e50;
  --accent: #f5576c;
  --bg: #ffffff;
  --text: #333;
  --card-bg: #f8f9fa;
  --border: #ddd;
  
  /* Glassmorphism */
  --glass-bg: rgba(248, 249, 250, 0.7);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-blur: blur(10px);
  
  /* Shadows - Enhanced depth */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 8px 24px rgba(102, 126, 234, 0.12);
  --shadow-lg: 0 12px 48px rgba(102, 126, 234, 0.15);
  --shadow-glow: 0 8px 32px rgba(102, 126, 234, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.2);
  --shadow: rgba(0, 0, 0, 0.1);
}

body.dark-mode {
  /* Gradients remain same */
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --accent-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --glow-gradient: linear-gradient(90deg, #667eea, #764ba2, #f093fb, #f5576c);
  
  /* Colors */
  --bg: #0f0f1e;
  --text: #e8e8f0;
  --card-bg: #1a1a2e;
  --border: rgba(255, 255, 255, 0.1);
  --secondary: #16213e;
  
  /* Glassmorphism (darker for dark mode) */
  --glass-bg: rgba(26, 26, 46, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  /* Shadows for dark mode */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(102, 126, 234, 0.1);
  --shadow-lg: 0 12px 48px rgba(102, 126, 234, 0.08);
  --shadow-glow: 0 8px 32px rgba(102, 126, 234, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

/* Images - Prevent layout shift */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Header */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: linear-gradient(180deg, rgba(44, 62, 80, 0.75) 0%, rgba(44, 62, 80, 0.6) 100%);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.75rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
  height: 70px;
}

.logo {
  font-size: 1.3rem;
  font-weight: 800;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2.5px;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo:hover {
  transform: scale(1.08);
  filter: brightness(1.15);
}

nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.5rem;
}

.nav-links li {
  position: relative;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  display: block;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid transparent;
  white-space: nowrap;
}

.nav-links a:hover {
  background: rgba(102, 126, 234, 0.25);
  border: 1px solid rgba(102, 126, 234, 0.4);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.nav-links a.active {
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.4) 0%, rgba(118, 75, 162, 0.4) 100%);
  border: 1px solid rgba(102, 126, 234, 0.6);
  color: white;
  box-shadow: 0 4px 16px rgba(102, 126, 234, 0.25);
  font-weight: 700;
}

#dark-mode-toggle {
  background: none;
  border: none;
  color: white;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  margin-left: 0.5rem;
}

#dark-mode-toggle:hover {
  transform: scale(1.15);
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

#dark-mode-toggle:active {
  transform: scale(0.95);
}

.toggle-icon {
  width: 24px;
  height: 24px;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.toggle-icon .moon-icon {
  transition: opacity 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.toggle-icon .sun-icon,
.toggle-icon .sun-rays {
  transition: opacity 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  opacity: 0;
  transform: rotate(-180deg) scale(0);
}

body.dark-mode .toggle-icon .moon-icon {
  opacity: 0;
  transform: rotate(180deg) scale(0);
}

body.dark-mode .toggle-icon .sun-icon,
body.dark-mode .toggle-icon .sun-rays {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  margin-left: 1rem;
}

.burger span {
  width: 25px;
  height: 3px;
  background: white;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  border-radius: 2px;
}

.burger:hover span {
  background: var(--primary-gradient);
}

.burger.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.burger.active span:nth-child(2) {
  opacity: 0;
}

.burger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Hero Slider */
.hero-slider {
  position: relative;
  height: 100vh;
  overflow: hidden;
  border-radius: 24px;
  margin: 70px auto 0;
  max-width: 95vw;
  box-shadow: var(--shadow-lg);
}

.slide {
  position: absolute;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide.active {
  opacity: 1;
}

.slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.3) 0%, rgba(102, 126, 234, 0.4) 100%);
  animation: gradientShift 4s ease infinite;
}

.slide-content {
  position: relative;
  text-align: center;
  color: white;
  animation: fadeInUp 1s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  z-index: 2;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.slide-content h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  font-weight: 800;
  animation: slideInDown 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  letter-spacing: 2px;
}

.slide-content p {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  animation: slideInUp 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.2s backwards;
  font-weight: 300;
  letter-spacing: 0.5px;
}

/* Sections */
section {
  padding: 5rem 5%;
  max-width: 1400px;
  margin: 0 auto;
}

h2 {
  font-size: 2.8rem;
  margin-bottom: 3rem;
  text-align: center;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  letter-spacing: 1px;
}

/* Search */
.search-bar {
  max-width: 500px;
  margin: 0 auto 2rem;
}

#search-input {
  width: 100%;
  padding: 1rem 1.5rem;
  border: 2px solid transparent;
  border-radius: 50px;
  font-size: 1rem;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 2px solid var(--glass-border);
  color: var(--text);
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  box-shadow: var(--shadow-sm);
}

#search-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.4);
  background: var(--glass-bg);
}

#search-input::placeholder {
  color: rgba(51, 51, 51, 0.5);
}

/* Filters */
.filters {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 2rem;
}

.filters select {
  padding: 0.8rem 1.2rem;
  border: 2px solid var(--glass-border);
  border-radius: 10px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  font-weight: 500;
  box-shadow: var(--shadow-sm);
}

.filters select:hover {
  background: rgba(248, 249, 250, 0.9);
  border-color: var(--primary);
}

.filters select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
  background: var(--glass-bg);
}

#reset-filters {
  background: var(--primary-gradient);
}

/* Car Grid */
#car-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.car-card {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
  transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  animation: fadeIn 0.6s ease-out;
  position: relative;
}

.car-card:hover {
  transform: translateY(-15px) scale(1.02);
  box-shadow: 0 20px 60px rgba(102, 126, 234, 0.25);
  border-color: var(--primary);
}

.car-card img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  aspect-ratio: 16 / 10;
  display: block;
}

.car-card:hover img {
  transform: scale(1.08);
  filter: brightness(1.1);
}

.car-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(102, 126, 234, 0.2) 100%);
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  pointer-events: none;
}

.car-card:hover::after {
  opacity: 1;
}

.car-info {
  padding: 1.8rem;
  position: relative;
  z-index: 1;
}

.car-info h3 {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.car-info .brand {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 0.8rem;
  letter-spacing: 1px;
}

.car-info p {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  margin-bottom: 1rem;
}

/* Buttons */
.btn, .btn-small {
  display: inline-block;
  padding: 1rem 2rem;
  background: var(--primary-gradient);
  color: white;
  text-decoration: none;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  font-size: 1rem;
  font-weight: 600;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-small {
  padding: 0.7rem 1.5rem;
  font-size: 0.9rem;
}

.btn:hover, .btn-small:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn:active, .btn-small:active {
  transform: translateY(0) scale(0.98);
}

/* Comparator */
.comparator {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-top: 3px solid;
  border-image: var(--primary-gradient) 1;
  padding: 3rem;
  border-radius: 20px;
  max-width: 800px;
  margin: 0 auto;
  box-shadow: var(--shadow-glow);
}

.comparator-selects {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.comparator-selects select {
  padding: 1rem 1.2rem;
  border: 2px solid var(--glass-border);
  border-radius: 12px;
  font-size: 1rem;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  color: var(--text);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  font-weight: 500;
}

.comparator-selects select:hover {
  border-color: var(--primary);
  box-shadow: 0 0 15px rgba(102, 126, 234, 0.2);
}

.comparator-selects select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

#compare-btn {
  width: 100%;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(5px);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg);
  padding: 3rem;
  border-radius: 25px;
  max-width: 900px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: slideUp 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
  border: 1px solid var(--glass-border);
}

.modal-content h2 {
  margin-bottom: 2rem;
}

.close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  font-size: 2rem;
  cursor: pointer;
  color: var(--text);
  background: none;
  border: none;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  border-radius: 50%;
}

.close:hover {
  transform: rotate(90deg) scale(1.15);
  background: rgba(102, 126, 234, 0.1);
  color: var(--primary);
}

.comparison-table table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
}

.comparison-table th,
.comparison-table td {
  padding: 1.2rem;
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
}

.comparison-table th {
  background: var(--primary-gradient);
  color: white;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.9rem;
}

.comparison-table tbody tr:nth-child(even) {
  background: rgba(102, 126, 234, 0.05);
}

.comparison-table tbody tr:hover {
  background: rgba(102, 126, 234, 0.1);
}

.comparison-table .winner {
  background: linear-gradient(135deg, rgba(46, 204, 113, 0.2), rgba(102, 126, 234, 0.1));
  font-weight: bold;
  border-left: 4px solid #2ecc71;
  padding-left: calc(1.2rem - 4px);
}

.performance-bars {
  margin: 3rem 0;
}

.perf-bar {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  animation: slideInLeft 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.perf-bar span:first-child {
  min-width: 150px;
  font-weight: 700;
  color: var(--text);
  font-size: 0.95rem;
}

.bar {
  flex: 1;
  height: 35px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.fill {
  height: 100%;
  background: var(--glow-gradient);
  transition: width 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  box-shadow: 0 0 10px rgba(102, 126, 234, 0.4);
}

/* Page voiture individuelle */
.hero-image {
  width: 100%;
  height: 60vh;
  object-fit: cover;
  margin-top: 70px;
  animation: zoomIn 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
}

.hero-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(102, 126, 234, 0.3) 100%);
}

.car-details {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 5%;
}

.car-details h1 {
  font-size: 2.8rem;
  margin-bottom: 2rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  letter-spacing: 1px;
}

.specs-table {
  width: 100%;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  overflow: hidden;
  margin: 2rem 0;
  box-shadow: var(--shadow-glow);
}

.specs-table table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table th,
.specs-table td {
  padding: 1.2rem;
  text-align: left;
  border-bottom: 1px solid var(--glass-border);
}

.specs-table th {
  background: var(--primary-gradient);
  color: white;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-size: 0.9rem;
}

.specs-table tbody tr:nth-child(even) {
  background: rgba(102, 126, 234, 0.05);
}

.specs-table tbody tr:hover {
  background: rgba(102, 126, 234, 0.1);
}

.specs-table tr:last-child td {
  border-bottom: none;
}

.history {
  margin: 4rem 0;
  line-height: 1.9;
  animation: fadeInUp 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94) 0.2s backwards;
}

.history h2 {
  margin-bottom: 2rem;
}

.history p {
  margin-bottom: 1.5rem;
  text-align: justify;
  color: var(--text);
  border-left: 4px solid var(--primary-gradient);
  padding-left: 1.5rem;
  font-size: 1.05rem;
}

/* Timeline */
.timeline {
  position: relative;
  padding: 2rem 0;
  margin: 4rem 0;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--primary-gradient);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  margin-bottom: 2.5rem;
  position: relative;
  animation: fadeIn 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.timeline-item:nth-child(odd) {
  flex-direction: row;
}

.timeline-item:nth-child(even) {
  flex-direction: row-reverse;
}

.timeline-content {
  width: 45%;
  padding: 1.8rem;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: 15px;
  box-shadow: var(--shadow-md);
  animation: fadeInUp 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.timeline-item:hover .timeline-content {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
  background: rgba(248, 249, 250, 0.8);
}

.timeline-content h3 {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
  font-weight: 700;
}

.timeline-content p {
  color: var(--text);
  font-size: 0.95rem;
}

.timeline-dot {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 24px;
  background: var(--primary-gradient);
  border-radius: 50%;
  border: 4px solid var(--bg);
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.5);
  animation: pulse 2s cubic-bezier(0.25, 0.46, 0.45, 0.94) infinite;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideUp {
  from {
    transform: translateY(50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideIn {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}

@keyframes zoomIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.5), 0 0 0 0 rgba(102, 126, 234, 0.7);
  }
  50% {
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.5), 0 0 0 8px rgba(102, 126, 234, 0);
  }
}

@keyframes pulseGlow {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
  }
  50% {
    opacity: 0.8;
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

@keyframes gradientShift {
  0% {
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.3) 0%, rgba(102, 126, 234, 0.4) 100%);
  }
  50% {
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.2) 0%, rgba(118, 75, 162, 0.45) 100%);
  }
  100% {
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.3) 0%, rgba(102, 126, 234, 0.4) 100%);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    right: -100%;
    flex-direction: column;
    background: rgba(44, 62, 80, 0.95);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    width: 100%;
    padding: 2rem;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    gap: 1.5rem;
  }
  
  .nav-links.active {
    right: 0;
  }
  
  .nav-links a {
    padding: 0.8rem 1rem;
    font-size: 0.95rem;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 8px;
  }
  
  .burger {
    display: flex;
  }
  
  .slide-content h1 {
    font-size: 2.2rem;
  }
  
  .slide-content p {
    font-size: 1rem;
  }
  
  #car-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .comparator-selects {
    grid-template-columns: 1fr;
  }
  
  .modal-content {
    padding: 2rem 1rem;
    margin: 1rem;
    border-radius: 15px;
  }
  
  .comparison-table {
    overflow-x: auto;
  }
  
  .timeline::before {
    left: 20px;
  }
  
  .timeline-item {
    flex-direction: row !important;
    margin-bottom: 2rem;
  }
  
  .timeline-content {
    width: calc(100% - 60px);
    margin-left: 60px;
    padding: 1.5rem;
  }
  
  .timeline-dot {
    left: 20px;
  }
  
  .perf-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.8rem;
  }
  
  .perf-bar span:first-child {
    min-width: auto;
  }
  
  .bar {
    width: 100%;
  }
  
  section {
    padding: 2.5rem 5%;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .car-details h1 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  header {
    padding: 0.8rem 3%;
  }
  
  .logo {
    font-size: 1.2rem;
  }
  
  #dark-mode-toggle {
    width: 35px;
    height: 35px;
    font-size: 1.3rem;
  }
  
  h2 {
    font-size: 1.6rem;
    margin-bottom: 2rem;
  }
  
  .car-card {
    border-radius: 15px;
  }
  
  .car-card img {
    height: 180px;
  }
  
  .car-info {
    padding: 1.2rem;
  }
  
  .car-info h3 {
    font-size: 1.3rem;
  }
  
  .slide-content h1 {
    font-size: 1.8rem;
  }
  
  .slide-content p {
    font-size: 0.9rem;
  }
  
  .search-bar {
    max-width: 100%;
  }
  
  #search-input {
    font-size: 16px;
  }
  
  .filters {
    gap: 0.5rem;
    flex-direction: column;
  }
  
  .filters select {
    width: 100%;
  }
  
  .modal-content {
    padding: 1.5rem;
    max-width: 90vw;
  }
  
  .specs-table th,
  .specs-table td {
    padding: 0.8rem;
    font-size: 0.9rem;
  }
  
  .timeline-content {
    width: calc(100% - 50px);
    margin-left: 50px;
    padding: 1.2rem;
    font-size: 0.9rem;
  }
  
  .timeline-dot {
    left: 15px;
    width: 20px;
    height: 20px;
  }
  
  .perf-bar span:first-child {
    font-size: 0.85rem;
    min-width: 120px;
  }
  
  section {
    padding: 2rem 4%;
  }
  
  .car-details {
    padding: 2rem 4%;
  }
}

/* Footer */
footer {
  margin-top: 6rem;
  background: linear-gradient(135deg, var(--secondary) 0%, rgba(44, 62, 80, 0.95) 100%);
  border-top: 1px solid var(--glass-border);
  color: white;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 4rem 5%;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 3rem;
}

.footer-section h3 {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
  letter-spacing: 1px;
}

.footer-section p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 1rem;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 0.8rem;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  display: inline-block;
}

.footer-section a:hover {
  color: white;
  padding-left: 6px;
}

.footer-section a::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.footer-section a:hover::before {
  width: 100%;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 2rem 5%;
  max-width: 1400px;
  margin: 0 auto;
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.9rem;
}

.footer-bottom p {
  margin-bottom: 0.5rem;
}

.footer-links span {
  display: inline-block;
  animation: float 3s ease-in-out infinite;
}

/* Fallback for browsers without backdrop-filter support */
@supports not (backdrop-filter: blur(10px)) {
  .glass-bg,
  header,
  .car-card,
  .comparator,
  .specs-table,
  .timeline-content,
  .bar,
  .modal-content,
  #search-input,
  .filters select {
    backdrop-filter: none !important;
  }
  
  header {
    background: rgba(44, 62, 80, 1);
  }
  
  .car-card {
    background: rgba(248, 249, 250, 1);
  }
}

/* FAQ rich snippet */
.faq-section {
  margin: 3rem 0;
}

.faq-section h2 {
  margin-bottom: 1.5rem;
}

.faq-item {
  border: 1px solid rgba(0,0,0,0.1);
  border-radius: 10px;
  margin-bottom: 0.75rem;
  overflow: hidden;
  transition: box-shadow 0.2s;
}

.dark-mode .faq-item {
  border-color: rgba(255,255,255,0.1);
}

.faq-item:hover {
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: '+';
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--primary);
  transition: transform 0.25s;
  flex-shrink: 0;
  margin-left: 1rem;
}

details[open] .faq-question::after {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 1.25rem 1rem;
  line-height: 1.7;
  color: var(--text);
  opacity: 0.85;
}

/* Footer */
footer {
  background: var(--secondary);
  color: white;
  text-align: center;
  padding: 2rem;
  margin-top: 3rem;
}