/* Reset & Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-bg: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-border: #e5e7eb;
  --color-shadow: rgba(0, 0, 0, 0.1);
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #3b82f6;
    --color-primary-hover: #60a5fa;
    --color-text: #f9fafb;
    --color-text-secondary: #d1d5db;
    --color-bg: #111827;
    --color-bg-secondary: #1f2937;
    --color-border: #374151;
    --color-shadow: rgba(0, 0, 0, 0.3);
  }
}

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

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
.header {
  text-align: center;
  padding: var(--spacing-xl) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-xl);
}

.header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  background: linear-gradient(135deg, var(--color-primary) 0%, #7c3aed 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  font-weight: 400;
}

/* Main */
.main {
  flex: 1;
}

/* Card Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* Card */
.card {
  display: block;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-decoration: none;
  color: inherit;
  transition: all 0.3s ease;
  box-shadow: 0 1px 3px var(--color-shadow);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px var(--color-shadow);
  border-color: var(--color-primary);
}

.card-disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.card-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  line-height: 1;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.card-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  font-size: 0.938rem;
  line-height: 1.7;
}

.card-footer {
  display: flex;
  gap: var(--spacing-xs);
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--color-primary);
  color: white;
  border-radius: var(--radius-sm);
  font-size: 0.813rem;
  font-weight: 500;
}

.badge-secondary {
  background: var(--color-text-secondary);
}

/* Info Section */
.info-section {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.info-section h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.info-section p {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

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

.info-section li {
  padding: var(--spacing-xs) 0;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.info-section li::before {
  content: "→ ";
  color: var(--color-primary);
  font-weight: bold;
  margin-right: var(--spacing-xs);
}

/* Footer */
.footer {
  text-align: center;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-xl);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.footer a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.footer a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

.copyright {
  margin-top: var(--spacing-sm);
  opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
  .header h1 {
    font-size: 2rem;
  }

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