:root {
  --color-primary: #1e40af;
  --color-primary-dark: #1e3a8a;
  --color-primary-light: #3b82f6;
  --color-secondary: #3b82f6;
  --color-accent: #10b981;
  --color-accent-alt: #06b6d4;
  
  --color-bg-primary: #f8fafc;
  --color-bg-secondary: #f1f5f9;
  --color-bg-card: #ffffff;
  
  --color-text-primary: #1e293b;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
  
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  
  --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-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  --font-sans: 'Hiragino Sans', 'Yu Gothic', 'Meiryo', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Noto Sans JP', var(--font-sans);
  
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
}

* {
  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(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.car-card {
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg-card);
}

.car-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.car-image {
  height: 200px;
  object-fit: cover;
  width: 100%;
  transition: transform var(--transition-slow);
}

.car-card:hover .car-image {
  transform: scale(1.05);
}

.month-section {
  scroll-margin-top: 80px;
}

.lang-btn {
  transition: all var(--transition-normal);
  border: none;
  cursor: pointer;
  font-weight: 500;
}

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

.lang-btn:not(.active):hover {
  background-color: #dbeafe;
}

.gradient-bg {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.text-gradient {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hover-lift {
  transition: transform var(--transition-normal);
}

.hover-lift:hover {
  transform: translateY(-2px);
}

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

.skeleton {
  background: linear-gradient(90deg, var(--color-bg-secondary) 25%, #e2e8f0 50%, var(--color-bg-secondary) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
}

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

.skeleton-card {
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.skeleton-image {
  height: 200px;
  width: 100%;
}

.skeleton-text {
  height: 1rem;
  border-radius: var(--radius-sm);
  margin: 0.5rem 0;
}

.skeleton-text-sm {
  height: 0.75rem;
  width: 60%;
}

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

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

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

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

.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.loading-overlay.active {
  opacity: 1;
  visibility: visible;
}

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

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-weight: 500;
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
}

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

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

.nav-pill {
  background-color: var(--color-primary);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  transition: all var(--transition-normal);
  display: inline-block;
}

.nav-pill:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.nav-pill-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  position: sticky;
  top: 0;
  background: var(--color-bg-primary);
  padding: 1rem 0;
  z-index: var(--z-sticky);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.image-error {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.image-error i {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  background: var(--color-text-primary);
  color: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: var(--z-tooltip);
  transform: translateY(100px);
  opacity: 0;
  transition: all var(--transition-normal);
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

@media (max-width: 768px) {
  :root {
    --radius-xl: 0.75rem;
  }
  
  .car-image {
    height: 180px;
  }
  
  .nav-pill-container {
    padding: 0.75rem 0;
  }
  
  .nav-pill {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .car-image {
    height: 160px;
  }
}

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