:root {
  color-scheme: light;
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-soft: #eef2f7;
  --text: #172033;
  --muted: #5d6b82;
  --line: #d8e0ea;
  --accent: #1f6feb;
  --accent-soft: #e7f0ff;
  --code-bg: #111827;
  --code-text: #edf2f7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.65;
}

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

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  min-height: 56px;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(248, 250, 252, 0.96);
  backdrop-filter: blur(10px);
}

.brand {
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 700;
}

.layout {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  gap: 32px;
  width: min(1280px, 100%);
  margin: 0 auto;
  padding: 28px;
}

.site-nav {
  position: sticky;
  top: 84px;
  align-self: start;
  max-height: calc(100vh - 112px);
  overflow: auto;
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.nav-list {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.nav-list .nav-list {
  margin-top: 6px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.nav-item {
  margin: 5px 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.nav-item > a,
.nav-item > span {
  display: inline-block;
  padding: 3px 0;
}

.nav-item.is-active > a,
.nav-item.is-active > span {
  color: var(--text);
  font-weight: 700;
}

.content {
  min-width: 0;
  padding: 34px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.content h1,
.content h2,
.content h3,
.content h4 {
  line-height: 1.25;
}

.content h1 {
  margin-top: 0;
  font-size: 2.1rem;
}

.content h2 {
  margin-top: 2rem;
  padding-top: 0.2rem;
  border-top: 1px solid var(--line);
  font-size: 1.45rem;
}

.content h3 {
  margin-top: 1.6rem;
  font-size: 1.2rem;
}

.content p,
.content ul,
.content ol,
.content table {
  max-width: 78ch;
}

.content table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.content th,
.content td {
  padding: 8px 10px;
  border: 1px solid var(--line);
  text-align: left;
}

.content th {
  background: var(--surface-soft);
}

.content code {
  padding: 0.1rem 0.25rem;
  border-radius: 4px;
  background: var(--accent-soft);
  font-size: 0.92em;
}

.content pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 16px;
  background: var(--code-bg);
  color: var(--code-text);
}

.content pre code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.admonition {
  max-width: 78ch;
  padding: 12px 14px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
}

.site-footer {
  width: min(1280px, 100%);
  margin: 0 auto;
  padding: 0 28px 28px;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 18px;
  }

  .site-nav {
    position: static;
    max-height: none;
  }

  .content {
    padding: 22px;
  }
}