@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@500;600&display=swap');

:root {
  --color-bg-primary: #0a0a0a;
  --color-bg-secondary: #121212;
  --color-bg-tertiary: #1a1a1a;
  --color-bg-elevated: #242424;
  
  --color-text-primary: #ffffff;
  --color-text-secondary: #a3a3a3;
  --color-text-tertiary: #737373;
  
  --color-accent-primary: #3b82f6;
  --color-accent-secondary: #8b5cf6;
  --color-accent-success: #10b981;
  --color-accent-danger: #ef4444;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 2.5rem;
  
  --border-radius: 8px;
  --max-width: 1400px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.compact-header {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-lg) var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.header-left {
  display: flex;
  align-items: baseline;
  gap: var(--space-md);
}

.main-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.main-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-tertiary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.header-stats {
  display: flex;
  gap: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.stat-item {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.stat-number {
  font-weight: 700;
  color: var(--color-accent-primary);
  font-size: 1.1rem;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-lg);
  flex: 1;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  grid-auto-rows: 1fr;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.category-card {
  --card-accent: var(--color-accent-primary);
  
  display: flex;
  flex-direction: column;
  background: var(--color-bg-secondary);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--border-radius);
  padding: var(--space-md);
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
  height: 100%;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--card-accent);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.category-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  background: var(--color-bg-tertiary);
  transform: translateY(-2px);
}

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

.category-header {
  margin-bottom: var(--space-md);
  flex-shrink: 0;
}

.category-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text-primary);
  line-height: 1.3;
  letter-spacing: -0.01em;
  min-height: 2.86rem;
  display: flex;
  align-items: center;
}

.top-three {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  flex: 1;
  min-height: 0;
}

.top-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0.4rem;
  background: var(--color-bg-tertiary);
  border-radius: 4px;
  transition: all 0.2s ease;
}

.category-card:hover .top-item {
  background: var(--color-bg-elevated);
}

.item-icon {
  width: 24px;
  height: 24px;
  object-fit: contain;
  flex-shrink: 0;
  border-radius: 6px;
  background: var(--color-bg-elevated);
  padding: 3px;
  border: 1px solid rgba(59, 130, 246, 0.2);
  transition: all 0.2s ease;
}

.category-card:hover .item-icon {
  border-color: rgba(59, 130, 246, 0.4);
  transform: scale(1.05);
}

.item-name {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.no-items {
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
  font-style: italic;
  padding: var(--space-sm);
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
}

.category-footer {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding-top: var(--space-sm);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: auto;
  flex-shrink: 0;
}

.category-link {
  color: var(--card-accent);
  font-weight: 600;
  font-size: 0.75rem;
  transition: transform 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.category-link::after {
  content: '→';
  transition: transform 0.2s ease;
}

.category-card:hover .category-link::after {
  transform: translateX(3px);
}

.github-badges {
  display: flex;
  gap: var(--space-xs);
  justify-content: center;
  flex-wrap: wrap;
  padding: var(--space-md) var(--space-lg);
}

.github-badges a {
  transition: transform 0.2s ease;
  opacity: 0.8;
}

.github-badges a:hover {
  transform: translateY(-2px);
  opacity: 1;
}

.github-badges img {
  height: 18px;
  display: block;
}

.main-footer {
  text-align: center;
  padding: var(--space-md) var(--space-lg);
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
  margin-top: auto;
}

.main-footer p {
  margin: 0;
}

.footer-links {
  max-width: 800px;
  margin: 2rem auto;
  line-height: 1.8;
}

.footer-links a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color 0.2s ease;
  font-size: 0.8rem;
}

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

.footer-links span {
  color: rgba(255, 255, 255, 0.2);
}

@media (max-width: 768px) {
  .compact-header {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-md);
    gap: var(--space-sm);
  }
  
  .header-left {
    flex-direction: column;
    gap: var(--space-xs);
  }
  
  .main-title {
    font-size: 1.5rem;
  }
  
  .main-subtitle {
    font-size: 0.75rem;
  }
  
  .header-stats {
    gap: var(--space-sm);
    font-size: 0.75rem;
  }
  
  .stat-number {
    font-size: 1rem;
  }
  
  .container {
    padding: 0 var(--space-md) var(--space-md);
  }
  
  .category-grid {
    grid-template-columns: 1fr;
  }
  
  .github-badges {
    gap: 0.25rem;
    padding: var(--space-sm);
  }
  
  .github-badges img {
    height: 16px;
  }
  
  .footer-links {
    flex-direction: column;
    gap: var(--space-xs);
  }
  
  .footer-links span {
    display: none;
  }
  
  .content-page h2 {
    font-size: 1.5rem;
  }
  
  .content-page h3 {
    font-size: 1.2rem;
  }
}

@media (min-width: 769px) and (max-width: 1200px) {
  .category-grid {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
}

.content-page {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-lg);
}

.content-page h1 {
  font-size: 2.5rem;
  font-weight: 900;
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.content-page h2 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.content-page h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-text-primary);
  line-height: 1.4;
}

.content-page p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  max-width: none;
}

.content-page ul,
.content-page ol {
  margin: var(--space-md) 0;
  padding-left: var(--space-xl);
  color: var(--color-text-secondary);
}

.content-page li {
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}

.content-page ul {
  list-style-type: disc;
}

.content-page ol {
  list-style-type: decimal;
}

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

.content-page a {
  color: var(--color-accent-primary);
  text-decoration: underline;
  text-decoration-color: rgba(59, 130, 246, 0.3);
  transition: all 0.2s ease;
}

.content-page a:hover {
  color: var(--color-accent-secondary);
  text-decoration-color: var(--color-accent-secondary);
}

.content-page code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-bg-elevated);
  color: var(--color-accent-primary);
  padding: 0.2em 0.5em;
  border-radius: 4px;
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.content-page .last-updated {
  font-size: 0.9rem;
  color: var(--color-text-tertiary);
  font-style: italic;
  margin-bottom: var(--space-lg);
}

.content-page .intro {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  padding: var(--space-md);
  background: var(--color-bg-secondary);
  border-left: 3px solid var(--color-accent-primary);
  border-radius: 4px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-accent-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: var(--space-lg);
  transition: all 0.2s ease;
}

.back-link:hover {
  color: var(--color-accent-secondary);
  transform: translateX(-4px);
}

.back-link::before {
  content: '←';
  font-size: 1.2rem;
}

:focus-visible {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 4px;
}

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

@media print {
  body {
    background: white;
    color: black;
  }
  
  .github-badges,
  .footer-links {
    display: none;
  }
  
  .category-card {
    page-break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
}