/* ========================================
   HKEVTrends Modern Design System
   Inspired by Bubbles DS / Modern UI
   ======================================== */

/* ========== CSS Variables / Design Tokens ========== */
:root {
  /* Primary Colors - EV Green/Teal Theme */
  --color-primary-50: #ecfdf5;
  --color-primary-100: #d1fae5;
  --color-primary-200: #a7f3d0;
  --color-primary-300: #6ee7b7;
  --color-primary-400: #34d399;
  --color-primary-500: #10b981;
  --color-primary-600: #059669;
  --color-primary-700: #047857;
  --color-primary-800: #065f46;
  --color-primary-900: #064e3b;

  /* Accent Colors - Electric Blue */
  --color-accent-50: #eff6ff;
  --color-accent-100: #dbeafe;
  --color-accent-200: #bfdbfe;
  --color-accent-300: #93c5fd;
  --color-accent-400: #60a5fa;
  --color-accent-500: #3b82f6;
  --color-accent-600: #2563eb;
  --color-accent-700: #1d4ed8;
  --color-accent-800: #1e40af;
  --color-accent-900: #1e3a8a;

  /* Neutral Colors */
  --color-gray-50: #f8fafc;
  --color-gray-100: #f1f5f9;
  --color-gray-200: #e2e8f0;
  --color-gray-300: #cbd5e1;
  --color-gray-400: #94a3b8;
  --color-gray-500: #64748b;
  --color-gray-600: #475569;
  --color-gray-700: #334155;
  --color-gray-800: #1e293b;
  --color-gray-900: #0f172a;

  /* Semantic Colors */
  --color-success: #22c55e;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #0ea5e9;

  /* Background */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-hero: linear-gradient(135deg, #064e3b 0%, #0f766e 50%, #115e59 100%);

  /* Text */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  --text-inverse: #ffffff;

  /* Borders */
  --border-color: #e2e8f0;
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  --border-radius-2xl: 1.5rem;
  --border-radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-glow: 0 0 40px rgba(16, 185, 129, 0.15);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Typography */
  --font-sans: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Dark Mode Variables */
html.dark {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-card: #1e293b;
  --bg-hero: linear-gradient(135deg, #022c22 0%, #064e3b 50%, #0f766e 100%);

  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-tertiary: #94a3b8;

  --border-color: #334155;

  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.2);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.2);
  --shadow-glow: 0 0 40px rgba(16, 185, 129, 0.25);
}

/* ========== Base Styles ========== */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  margin: 0;
  min-height: 100vh;
}

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin: 0;
}

.text-display {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.text-headline {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.text-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.text-body {
  font-size: 1rem;
  color: var(--text-secondary);
}

.text-caption {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

.text-overline {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary-500);
}

/* ========== Layout ========== */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-8);
  }
}

/* ========== Navigation ========== */
.nav-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

html.dark .nav-header {
  background: rgba(15, 23, 42, 0.85);
}

.nav-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: var(--space-4);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--text-primary);
}

.nav-logo-icon {
  width: 40px;
  height: 40px;
  background: var(--bg-hero);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.25rem;
}

.nav-logo-text {
  font-weight: 700;
  font-size: 1.125rem;
}

.nav-logo-subtitle {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  display: none;
}

@media (min-width: 768px) {
  .nav-logo-subtitle {
    display: block;
  }
}

.nav-menu {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

.nav-menu.open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 64px;
  right: var(--space-4);
  left: var(--space-4);
  padding: var(--space-4);
  background: var(--bg-card);
  box-shadow: var(--shadow-lg);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-color);
  z-index: 90;
}

@media (min-width: 768px) {
  .nav-menu {
    display: flex;
  }
  .nav-menu.open {
    position: static;
    flex-direction: row;
    padding: 0;
    box-shadow: none;
    border-radius: 0;
    border: none;
  }
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--border-radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary-600);
  background: var(--color-primary-50);
}

html.dark .nav-link:hover {
  background: rgba(16, 185, 129, 0.1);
}

.nav-link.active {
  color: var(--color-primary-600);
  background: var(--color-primary-50);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  border-radius: var(--border-radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-toggle:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

@media (min-width: 768px) {
  .nav-toggle.menu-toggle,
  .nav-toggle.mobile-only {
    display: none;
  }
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 99;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.mobile-menu.open {
  display: block;
}

.mobile-menu-content {
  position: absolute;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  background: var(--bg-primary);
  padding: var(--space-6);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
}

.mobile-menu.open .mobile-menu-content {
  transform: translateX(0);
}

.mobile-menu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-6);
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--border-radius-md);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
  margin-bottom: var(--space-1);
}

.mobile-nav-link:hover {
  color: var(--color-primary-600);
  background: var(--color-primary-50);
}

/* ========== Hero Section ========== */
.hero {
  background: linear-gradient(135deg, rgba(6, 78, 59, 0.85) 0%, rgba(15, 118, 110, 0.55) 50%, rgba(17, 94, 89, 0.85) 100%),
              url('/assets/hero-banner.jpg') center/cover no-repeat;
  color: white;
  padding: var(--space-12) 0 var(--space-16);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--border-radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: var(--space-4);
  backdrop-filter: blur(8px);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.1); }
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
  color: #d2f5e7;
  text-shadow: 1px 1px #333;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  opacity: 0.9;
  max-width: 600px;
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

/* ========== KPI Cards ========== */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-top: calc(var(--space-8) * -1);
  position: relative;
  z-index: 10;
}

@media (min-width: 768px) {
  .kpi-grid {
    grid-template-columns: repeat(4, 1fr);
    margin-top: calc(var(--space-12) * -1);
  }
}

.kpi-card {
  background: var(--bg-card);
  border-radius: var(--border-radius-xl);
  padding: var(--space-5);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.kpi-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary-400), var(--color-accent-400));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.kpi-card:hover::before {
  opacity: 1;
}

.kpi-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
  font-size: 1.25rem;
}

.kpi-icon.green {
  background: var(--color-primary-100);
  color: var(--color-primary-600);
}

.kpi-icon.blue {
  background: var(--color-accent-100);
  color: var(--color-accent-600);
}

.kpi-icon.amber {
  background: #fef3c7;
  color: #d97706;
}

.kpi-icon.cyan {
  background: #cffafe;
  color: #0891b2;
}

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

html ::-webkit-scrollbar-track {
    background: #e6e6e6;
}

html ::-webkit-scrollbar-thumb {
    background: #475569;
    border-radius: 4px;
}

html ::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}

html.dark .kpi-icon.green {
  background: rgba(16, 185, 129, 0.2);
}

html.dark .kpi-icon.blue {
  background: rgba(59, 130, 246, 0.2);
}

html.dark .kpi-icon.amber {
  background: rgba(245, 158, 11, 0.2);
}

html.dark .kpi-icon.cyan {
  background: rgba(14, 165, 233, 0.2);
}

.kpi-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: var(--space-1);
}

.kpi-value {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.kpi-change {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: var(--space-2);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--border-radius-full);
}

.kpi-change.positive {
  background: var(--color-primary-100);
  color: var(--color-primary-700);
}

.kpi-change.negative {
  background: #fee2e2;
  color: #dc2626;
}

html.dark .kpi-change.positive {
  background: rgba(16, 185, 129, 0.2);
  color: var(--color-primary-400);
}

html.dark .kpi-change.negative {
  background: rgba(239, 68, 68, 0.2);
  color: #f87171;
}

/* ========== Section Styles ========== */
.section {
  padding: var(--space-12) 0;
}

.section-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

@media (min-width: 640px) {
  .section-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

/* ========== Cards ========== */
.card {
  background: var(--bg-card);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  padding: var(--space-5);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card-body {
  padding: var(--space-5);
}

.card-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--border-color);
  background: var(--bg-tertiary);
}

/* ========== Chart Cards ========== */
.chart-card {
  background: var(--bg-card);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.chart-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.chart-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.chart-body {
  padding: var(--space-4);
}

.chart-toggle {
  display: inline-flex;
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-md);
  padding: var(--space-1);
}

.chart-toggle-btn {
  padding: var(--space-2) var(--space-3);
  font-size: 0.75rem;
  font-weight: 500;
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chart-toggle-btn.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.chart-toggle-btn:hover:not(.active) {
  color: var(--text-secondary);
}

/* ========== Info Box ========== */
.info-box {
  background: linear-gradient(135deg, var(--color-primary-50), var(--color-accent-50));
  border-left: 4px solid var(--color-primary-500);
  border-radius: 0 var(--border-radius-lg) var(--border-radius-lg) 0;
  padding: var(--space-5);
  margin-bottom: var(--space-6);
}

html.dark .info-box {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(59, 130, 246, 0.1));
}

.info-box-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.info-box-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--color-primary-500);
  color: white;
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

.info-box-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-primary-800);
  margin-bottom: var(--space-2);
}

html.dark .info-box-title {
  color: var(--color-primary-300);
}

.info-box-content {
  color: var(--text-secondary);
  line-height: 1.7;
}

.info-box-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.info-box-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-primary-200);
}

html.dark .info-box-links {
  border-color: rgba(16, 185, 129, 0.2);
}

.info-box-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary-600);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  transition: color var(--transition-fast);
}

.info-box-link:hover {
  color: var(--color-primary-700);
  text-decoration: underline;
}

/* ========== Tables ========== */
.table-container {
  background: var(--bg-card);
  border-radius: var(--border-radius-xl);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.table-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border-color);
}

.table-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.data-table th {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: var(--bg-tertiary);
}

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

/* ========== Video Grid ========== */
.video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .video-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .video-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.video-card {
  background: var(--bg-card);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-base);
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.video-thumbnail {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
}

.video-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.video-card:hover .video-thumbnail img {
  transform: scale(1.05);
}

.video-play-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.3);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.video-card:hover .video-play-icon {
  opacity: 1;
}

.video-play-icon svg {
  width: 48px;
  height: 48px;
  color: white;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.video-info {
  padding: var(--space-4);
}

.video-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: var(--space-2);
}

.video-meta {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

/* ========== Footer ========== */
.footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: var(--space-8) 0;
  margin-top: var(--space-12);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}

.footer-info {
  max-width: 400px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.footer-logo-icon {
  width: 32px;
  height: 32px;
  background: var(--bg-hero);
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 0.875rem;
}

.footer-logo-text {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
}

.footer-desc {
  font-size: 0.875rem;
  color: var(--text-tertiary);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.footer-links-group h4 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: var(--space-3);
}

.footer-links-group ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links-group li {
  margin-bottom: var(--space-2);
}

.footer-links-group a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links-group a:hover {
  color: var(--color-primary-500);
}

.footer-bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--border-radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn-primary {
  background: var(--color-primary-500);
  color: white;
}

.btn-primary:hover {
  background: var(--color-primary-600);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--border-color);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: var(--bg-tertiary);
}

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

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

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

.animate-fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

.animate-slide-up {
  animation: slideUp var(--transition-slow) ease-out;
}

.animate-slide-in-right {
  animation: slideInRight var(--transition-slow) ease-out;
}

/* Staggered animations */
.stagger-1 { animation-delay: 50ms; }
.stagger-2 { animation-delay: 100ms; }
.stagger-3 { animation-delay: 150ms; }
.stagger-4 { animation-delay: 200ms; }

/* ========== Skeleton Loading ========== */
.skeleton {
  background: linear-gradient(90deg, var(--bg-tertiary) 25%, var(--border-color) 50%, var(--bg-tertiary) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--border-radius-sm);
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ========== Utility Classes ========== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

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

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.grid-2 {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ========== Scroll Hint ========== */
.scroll-hint {
  position: relative;
}

.scroll-hint::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 60px;
  background: linear-gradient(to left, var(--bg-card), transparent);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.scroll-hint.has-scroll::after {
  opacity: 1;
}

/* ========== Car Detail Page ========== */
.car-detail-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  padding: auto;
}

@media (min-width: 640px) {
  .car-detail-layout {
    flex-direction: row;
  }
}

.car-detail-media {
  flex: 0 0 auto;
}

@media (min-width: 640px) {
  .car-detail-media {
    width: 40%;
  }
}

.car-detail-image {
  aspect-ratio: 16 / 10;
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
}

.car-detail-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.car-detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.car-tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  border: 1px solid var(--color-primary-100);
  border-radius: var(--border-radius-full);
}

html.dark .car-tag {
  background: rgba(16, 185, 129, 0.15);
  color: var(--color-primary-400);
  border-color: rgba(16, 185, 129, 0.3);
}

.car-detail-updated {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.car-detail-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.car-detail-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

@media (min-width: 640px) {
  .car-detail-title {
    font-size: 1.5rem;
  }
}

.car-specs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .car-specs-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.car-spec-item {
  padding: var(--space-3);
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-md);
}

.car-spec-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-1);
}

.car-spec-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.car-spec-price {
  color: var(--color-error);
  font-size: 1rem;
}

.car-detail-feature {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  white-space: pre-line;
  padding-top: var(--space-2);
  border-top: 1px solid var(--border-color);
}

.car-detail-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-top: var(--space-3);
}

/* ========== Alternate Layout Theme (theme-alt) ========== */
body.theme-alt {
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.35), rgba(16, 185, 129, 0.45)),
    url('/assets/hero-banner-alt4.png') center/cover no-repeat;
}

body.theme-alt .hero {
  background: transparent;
  padding: var(--space-12) 0 var(--space-16);
  box-shadow: none;
}

body.theme-alt .hero-title {
  font-size: clamp(2.25rem, 4vw, 3rem) !important;
  letter-spacing: -0.03em;
}

body.theme-alt .hero-subtitle {
  max-width: 40rem;
  opacity: 0.95;
}

body.theme-alt .card {
  border-radius: var(--border-radius-2xl);
  box-shadow: var(--shadow-lg);
  border-color: rgba(148, 163, 184, 0.35);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.96), rgba(241, 245, 249, 0.96));
}

body.theme-alt .card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-2px);
}

body.theme-alt .card-body {
  padding: var(--space-6);
}

body.theme-alt .explanation-box {
  background: linear-gradient(135deg, rgba(236, 253, 245, 0.96), rgba(219, 234, 254, 0.96));
  border-radius: var(--border-radius-2xl);
  box-shadow: var(--shadow-md);
}

body.theme-alt .brand-table th {
  background: rgba(241, 245, 249, 0.9);
}

body.theme-alt .brand-table tbody tr:hover {
  background: rgba(226, 232, 240, 0.6);
}

body.theme-alt .btn-primary {
  box-shadow: 0 12px 25px rgba(16, 185, 129, 0.35);
}

body.theme-alt .btn-secondary {
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.08);
}

/* ========== Print Styles ========== */
@media print {
  .nav-header,
  .footer,
  .nav-toggle {
    display: none !important;
  }

  .hero {
    background: #047857 !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .card,
  .chart-card,
  .table-container {
    break-inside: avoid;
  }
}