/* === Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #1c2128;
  --bg-code: #2d333b;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --border: #30363d;
  --green: #3fb950;
  --yellow: #d29922;
  --red: #f85149;
  --purple: #bc8cff;
  --orange: #f0883e;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-hover);
}

code, pre {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

/* === Layout === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* === Header === */
.site-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  white-space: nowrap;
}

.site-logo span {
  color: var(--accent);
}

/* === Search === */
.search-box {
  position: relative;
  flex: 1;
  max-width: 400px;
}

.search-box input {
  width: 100%;
  padding: 8px 12px 8px 36px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.2s;
}

.search-box input:focus {
  border-color: var(--accent);
}

.search-box svg {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  fill: var(--text-muted);
}

/* === Ad Banner === */
.ad-banner {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin: 20px 0;
  text-align: center;
  min-height: 90px;
}

/* === Home Page Grid === */
.hero {
  text-align: center;
  padding: 48px 0 32px;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.hero h1 span {
  color: var(--accent);
}

.hero p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

.sheets-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  padding: 0 0 48px;
}

.sheet-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color 0.2s, transform 0.2s;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sheet-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.sheet-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
}

.sheet-card h3 a {
  color: var(--text-primary);
}

.sheet-card h3 a:hover {
  color: var(--accent);
}

.sheet-card p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  flex: 1;
}

.sheet-card .tag {
  display: inline-block;
  background: var(--bg-code);
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: 12px;
  margin-right: 4px;
}

/* === Cheat Sheet Page === */
.sheet-header {
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}

.sheet-header .breadcrumb {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.sheet-header h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 8px;
}

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

/* === TOC === */
.toc {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 24px;
}

.toc h2 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.toc ul {
  list-style: none;
  columns: 2;
  gap: 24px;
}

.toc li {
  padding: 2px 0;
}

.toc a {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.toc a:hover {
  color: var(--accent);
}

/* === Section === */
.section {
  margin-bottom: 32px;
}

.section h2 {
  font-size: 1.375rem;
  font-weight: 700;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 16px;
  color: var(--accent);
}

/* === Command Cards === */
.cmd-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 16px;
}

.cmd-table th {
  text-align: left;
  background: var(--bg-secondary);
  padding: 10px 12px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.cmd-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  vertical-align: top;
}

.cmd-table tr:hover {
  background: var(--bg-secondary);
}

.cmd-table code {
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--green);
  white-space: nowrap;
}

.cmd-table .desc {
  color: var(--text-secondary);
}

/* === Code Blocks === */
pre.code-block {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  overflow-x: auto;
  margin: 12px 0;
  font-size: 0.85rem;
  line-height: 1.5;
}

pre.code-block code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}

.code-block .comment {
  color: var(--text-muted);
}

.code-block .keyword {
  color: var(--purple);
}

.code-block .string {
  color: var(--green);
}

.code-block .flag {
  color: var(--yellow);
}

/* === Tip / Note Boxes === */
.tip-box {
  background: var(--bg-secondary);
  border-left: 3px solid var(--green);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 12px 16px;
  margin: 12px 0;
  font-size: 0.875rem;
}

.tip-box.warning {
  border-left-color: var(--yellow);
}

.tip-box strong {
  color: var(--green);
}

.tip-box.warning strong {
  color: var(--yellow);
}

/* === Related Sheets === */
.related-sheets {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  margin-top: 32px;
}

.related-sheets h2 {
  font-size: 1.125rem;
  margin-bottom: 16px;
  color: var(--text-secondary);
}

.related-sheets .sheets-grid {
  padding-bottom: 0;
}

/* === Footer === */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 48px;
}

/* === Responsive === */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .hero p {
    font-size: 1rem;
  }

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

  .toc ul {
    columns: 1;
  }

  .sheet-header h1 {
    font-size: 1.5rem;
  }

  .site-header .container {
    flex-wrap: wrap;
  }

  .search-box {
    max-width: 100%;
    order: 3;
    width: 100%;
  }

  .cmd-table {
    font-size: 0.8rem;
  }

  .cmd-table th, .cmd-table td {
    padding: 8px;
  }
}

/* === Print === */
@media print {
  .site-header,
  .site-footer,
  .ad-banner,
  .search-box,
  .related-sheets {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  .container {
    max-width: 100%;
  }

  .cmd-table code {
    background: #f0f0f0;
    color: #000;
  }

  pre.code-block {
    background: #f5f5f5;
    border: 1px solid #ccc;
  }

  a {
    color: #000;
  }
}