:root {
  --bg: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --border: #e5e7eb;
  --code-bg: #f9fafb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.header {
  border-bottom: 1px solid var(--border);
  padding: 40px 0;
}

.subtitle {
  color: var(--muted);
  max-width: 700px;
}

.nav {
  border-bottom: 1px solid var(--border);
  background: #fafafa;
}

.nav-links {
  display: flex;
  gap: 20px;
  padding: 12px 0;
}

.nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 500;
}

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

.content section {
  margin: 40px 0;
}

h2 {
  margin-bottom: 12px;
}

ul {
  padding-left: 20px;
}

.code-block {
  display: block;
  background: var(--code-bg);
  border: 1px solid var(--border);
  padding: 16px;
  overflow-x: auto;
  font-family: monospace;
  font-size: 14px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

th, td {
  border: 1px solid var(--border);
  padding: 12px;
  text-align: left;
}

th {
  background: #f3f4f6;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  margin-top: 60px;
  color: var(--muted);
  font-size: 14px;
}

.fade-in {
  animation: fadeIn 0.6s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}