/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --background: #fafafa;
  --surface: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --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);
  --radius: 12px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Header styles */
.header {
  text-align: center;
  margin-bottom: 2rem;
  padding: 1.5rem 0;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.logo svg {
  color: var(--primary-color);
}

.logo h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
}

.subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  font-weight: 400;
  max-width: 500px;
  margin: 0 auto;
}

/* Main content */
.main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.regions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  width: 100%;
  max-width: 1200px;
}

/* Region cards */
.region-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  box-shadow: var(--shadow-sm);
  min-height: 160px;
  justify-content: center;
}

.region-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
  transform: scaleX(0);
  transition: var(--transition);
}

.region-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.region-card:hover::before {
  transform: scaleX(1);
}

.region-card:hover .card-arrow {
  transform: translateX(4px);
  color: var(--primary-color);
}

.region-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  filter: drop-shadow(0 4px 6px rgb(0 0 0 / 0.1));
}

.region-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

.region-card p {
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.card-arrow {
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: var(--transition);
  font-weight: 300;
}

/* Responsive design */
@media (min-width: 1200px) {
  .regions-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 768px) and (max-width: 1199px) {
  .regions-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 767px) {
  .container {
    padding: 1rem;
  }
  
  .logo h1 {
    font-size: 1.75rem;
  }
  
  .subtitle {
    font-size: 0.9rem;
  }
  
  .regions-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  
  .region-card {
    padding: 1.25rem;
    min-height: 140px;
  }
  
  .region-icon {
    font-size: 2rem;
  }
  
  .region-card h3 {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0.75rem;
  }
  
  .header {
    margin-bottom: 1.5rem;
    padding: 1rem 0;
  }
  
  .logo {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .logo h1 {
    font-size: 1.5rem;
  }
  
  .regions-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  
  .region-card {
    padding: 1rem;
    min-height: 120px;
  }
  
  .region-icon {
    font-size: 1.75rem;
  }
}

/* Focus states for accessibility */
.region-card:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --background: #0f0f23;
    --surface: #1a1a2e;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --border: #334155;
  }
  
  .region-card:hover {
    background: #1e1e3f;
  }
}

/* Loading animation for cards */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.region-card {
  animation: fadeInUp 0.6s ease-out forwards;
}

.region-card:nth-child(1) { animation-delay: 0.1s; }
.region-card:nth-child(2) { animation-delay: 0.2s; }
.region-card:nth-child(3) { animation-delay: 0.3s; }
.region-card:nth-child(4) { animation-delay: 0.4s; }
.region-card:nth-child(5) { animation-delay: 0.5s; }
.region-card:nth-child(6) { animation-delay: 0.6s; }
.region-card:nth-child(7) { animation-delay: 0.7s; }