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

:root {
  --bg: #ffffff;
  --bg-secondary: #f6f8fa;
  --text: #1a1a2e;
  --text-secondary: #555;
  --border: #e1e4e8;
  --link: #0969da;
  --code-bg: #1e1e2e;
  --code-text: #cdd6f4;
  --accent: #0969da;
  --success: #16a34a;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-secondary: #161b22;
    --text: #e6edf3;
    --text-secondary: #8b949e;
    --border: #30363d;
    --link: #58a6ff;
    --code-bg: #161b22;
    --code-text: #e6edf3;
    --accent: #58a6ff;
  }
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* === Navbar === */
.navbar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .container {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text);
  cursor: pointer;
}

@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0.5rem;
  }
  .nav-links.open { display: flex; }
}

/* === Content === */
.content {
  padding: 2rem 0;
}

.content h1 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  line-height: 1.3;
}

.content h2 {
  font-size: 1.4rem;
  margin: 2rem 0 0.75rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--border);
}

.content h3 {
  font-size: 1.15rem;
  margin: 1.5rem 0 0.5rem;
}

.content p {
  margin-bottom: 1rem;
}

.content ul, .content ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

.content li {
  margin-bottom: 0.3rem;
}

.content blockquote {
  border-left: 4px solid var(--accent);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  background: var(--bg-secondary);
  border-radius: 0 4px 4px 0;
}

/* === Code Blocks === */
.content code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--bg-secondary);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}

.content pre {
  position: relative;
  background: var(--code-bg);
  color: var(--code-text);
  padding: 1rem 1.2rem;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1rem 0;
  font-size: 0.85rem;
  line-height: 1.5;
}

.content pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.75rem;
  transition: background 0.2s;
}

.copy-btn:hover { background: rgba(255,255,255,0.2); }
.copy-btn.copied { background: var(--success); border-color: var(--success); }

/* === Tables === */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}

.content th, .content td {
  text-align: left;
  padding: 0.6rem 0.8rem;
  border-bottom: 1px solid var(--border);
}

.content th {
  background: var(--bg-secondary);
  font-weight: 600;
}

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

/* === Home Grid === */
.home h2 {
  font-size: 1.3rem;
  margin: 2rem 0 1rem;
  border-bottom: none;
}

.home h2 a {
  color: var(--text);
  text-decoration: none;
}

.home h2 a:hover {
  color: var(--accent);
  text-decoration: underline;
}

.home h3 {
  margin: 1.2rem 0 0.3rem;
}

.home h3 a {
  color: var(--text);
  font-size: 1.05rem;
}

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

/* === Footer === */
.footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  margin-top: 3rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* === Print === */
@media print {
  .navbar, .footer, .copy-btn { display: none !important; }
  body { font-size: 11pt; }
  a { color: #000; }
  pre { border: 1px solid #ccc; white-space: pre-wrap; }
}