:root {
  --max-width: 760px;
  --color-text: #1a1a1a;
  --color-muted: #6b7280;
  --color-link: #1d4ed8;
  --color-link-hover: #1e40af;
  --color-border: #e5e7eb;
  --color-border-strong: #d1d5db;
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-code-bg: #f3f4f6;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.site-nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-nav .brand {
  font-weight: 600;
  text-decoration: none;
  color: var(--color-text);
  font-size: 15px;
  letter-spacing: -0.01em;
}

.site-nav nav {
  display: flex;
  gap: 22px;
}

.site-nav nav a {
  color: var(--color-muted);
  text-decoration: none;
  font-size: 14px;
  padding: 4px 0;
}

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

.site-nav nav a.active {
  color: var(--color-text);
  border-bottom: 2px solid var(--color-text);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.prose h1 {
  font-size: 30px;
  margin: 0 0 8px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.prose h2 {
  font-size: 20px;
  margin: 40px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-border);
  letter-spacing: -0.01em;
}

.prose h3 {
  font-size: 17px;
  margin: 28px 0 10px;
}

.prose p {
  margin: 14px 0;
}

.prose ul,
.prose ol {
  margin: 14px 0;
  padding-left: 28px;
}

.prose li {
  margin: 6px 0;
}

.prose a {
  color: var(--color-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.prose a:hover {
  color: var(--color-link-hover);
}

.prose strong {
  font-weight: 600;
}

.prose code {
  font-family: var(--font-mono);
  background: var(--color-code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.92em;
}

.prose table {
  border-collapse: collapse;
  width: 100%;
  margin: 18px 0;
  font-size: 14px;
  background: var(--color-surface);
}

.prose th,
.prose td {
  border: 1px solid var(--color-border-strong);
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
}

.prose th {
  background: var(--color-bg);
  font-weight: 600;
}

.prose hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: 36px 0;
}

.prose em {
  color: var(--color-muted);
  font-style: italic;
}

.doc-list {
  list-style: none;
  margin: 24px 0;
  padding: 0;
}

.doc-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--color-border);
}

.doc-list li:last-child {
  border-bottom: none;
}

.doc-list .doc-title {
  font-weight: 600;
  font-size: 17px;
  display: block;
  margin-bottom: 4px;
}

.doc-list .doc-summary {
  color: var(--color-muted);
  font-size: 14px;
}

.last-updated {
  color: var(--color-muted);
  font-size: 14px;
  margin-top: 32px;
}

footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 28px 24px 48px;
  color: var(--color-muted);
  font-size: 13px;
  border-top: 1px solid var(--color-border);
  line-height: 1.7;
}

footer p {
  margin: 4px 0;
}

footer a {
  color: var(--color-muted);
  text-decoration: underline;
  text-underline-offset: 2px;
}

@media (max-width: 600px) {
  .prose h1 {
    font-size: 26px;
  }

  .prose h2 {
    font-size: 18px;
  }

  main {
    padding: 32px 20px 48px;
  }

  .site-nav {
    padding: 12px 20px;
  }
}