:root {
  --bg: #ffffff;
  --bg-elevated: #f8f9fb;
  --text: #1c1c1e;
  --text-secondary: #6e6e73;
  --text-tertiary: #8e8e93;
  --accent: #34a853;
  --accent-hover: #2d8e47;
  --border: #e5e5ea;
  --code-bg: #f2f2f7;
  --table-stripe: #fafafa;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --radius: 12px;
  --content-width: 720px;
  --header-height: 56px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-elevated: #1c1c1e;
    --text: #f2f2f7;
    --text-secondary: #aeaeb2;
    --text-tertiary: #8e8e93;
    --accent: #30d158;
    --accent-hover: #28a745;
    --border: #2c2c2e;
    --code-bg: #1c1c1e;
    --table-stripe: #161618;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.wrap {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}

@media (prefers-color-scheme: dark) {
  .site-header {
    background: rgba(0, 0, 0, 0.75);
  }
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: 960px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 17px;
}

.brand-mark {
  font-size: 22px;
}

.brand-name {
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  gap: 4px;
}

.site-nav a {
  padding: 6px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

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

.site-nav a.active {
  color: var(--accent);
  background: var(--bg-elevated);
}

@media (max-width: 520px) {
  .site-nav a {
    padding: 6px 8px;
    font-size: 14px;
  }
  .brand-name {
    display: none;
  }
}

/* Content */
.content {
  flex: 1;
  padding-top: 48px;
  padding-bottom: 64px;
}

.content h1 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
  line-height: 1.15;
}

.content h2 {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 48px 0 16px;
  padding-top: 16px;
  line-height: 1.25;
}

.content h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 32px 0 12px;
  line-height: 1.3;
}

.content h2 + p,
.content h3 + p {
  margin-top: 0;
}

.content p,
.content ul,
.content ol {
  margin: 16px 0;
}

.content ul,
.content ol {
  padding-left: 24px;
}

.content li {
  margin: 6px 0;
}

.content li > p {
  margin: 6px 0;
}

.content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.content a:hover {
  border-bottom-color: var(--accent);
}

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

.content em {
  color: var(--text-secondary);
  font-style: italic;
}

.content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

.content blockquote {
  margin: 16px 0;
  padding: 12px 18px;
  background: var(--bg-elevated);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-secondary);
}

.content code {
  font-family: "SF Mono", ui-monospace, "Menlo", "Monaco", Consolas, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text);
}

.content pre {
  background: var(--code-bg);
  padding: 16px 18px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.5;
  margin: 20px 0;
}

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

/* Tables */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 15px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.content thead {
  background: var(--bg-elevated);
}

.content th {
  text-align: left;
  font-weight: 600;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.content td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  vertical-align: top;
}

.content tbody tr:nth-child(even) {
  background: var(--table-stripe);
}

.content tbody tr:last-child td {
  border-bottom: none;
}

/* "Last updated" date styling */
.content > p > em:first-child {
  display: inline-block;
  font-size: 13px;
  color: var(--text-tertiary);
  font-style: normal;
  background: var(--bg-elevated);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 24px;
  font-variant-numeric: tabular-nums;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 24px 0;
  font-size: 14px;
  color: var(--text-tertiary);
}

.site-footer p {
  margin: 0;
  text-align: center;
}

.site-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  margin: 0 4px;
}

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

/* Index page: list of doc cards */
.content ul.doc-list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 12px;
  margin: 32px 0;
}

@media (min-width: 600px) {
  .content ul.doc-list {
    grid-template-columns: 1fr 1fr;
  }
}

.content ul.doc-list li {
  margin: 0;
  padding: 0;
}

.content ul.doc-list a.card {
  display: block;
  padding: 18px 20px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}

.content ul.doc-list a.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.content ul.doc-list .card-title {
  font-weight: 600;
  font-size: 17px;
  margin-bottom: 4px;
  color: var(--text);
}

.content ul.doc-list .card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.45;
}