:root {
  --bg: #f7f3eb;
  --bg-accent: #efe6d6;
  --panel: rgba(255, 252, 247, 0.92);
  --panel-strong: #fffaf2;
  --text: #231b12;
  --muted: #6f6255;
  --line: rgba(78, 56, 36, 0.14);
  --primary: #8f4e22;
  --primary-soft: rgba(143, 78, 34, 0.12);
  --code-bg: #f2ece1;
  --shadow: 0 24px 60px rgba(66, 44, 18, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "IBM Plex Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.7), transparent 32%),
    radial-gradient(circle at top right, rgba(224, 170, 110, 0.18), transparent 28%),
    linear-gradient(180deg, var(--bg) 0%, #f4efe6 100%);
}

code,
pre {
  font-family: "JetBrains Mono", "SFMono-Regular", "Menlo", monospace;
}

.shell {
  width: min(1440px, calc(100vw - 32px));
  margin: 16px auto;
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 18px;
}

.sidebar,
.content {
  background: var(--panel);
  backdrop-filter: blur(18px);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.sidebar {
  position: sticky;
  top: 16px;
  align-self: start;
  max-height: calc(100vh - 32px);
  overflow: auto;
  padding: 24px 18px 28px;
}

.content {
  padding: 28px;
}

.brand,
.hero {
  padding: 8px 6px 18px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  font-weight: 700;
}

.brand h1,
.hero h2 {
  margin: 0;
  line-height: 1.1;
}

.brand h1 {
  font-size: 1.8rem;
}

.hero h2 {
  font-size: clamp(2rem, 4vw, 3.25rem);
}

.summary,
.doc-meta {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.nav {
  display: grid;
  gap: 18px;
  padding-top: 10px;
}

.nav-group {
  padding: 14px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.74), rgba(255, 249, 240, 0.94));
  border: 1px solid var(--line);
}

.nav-group-title {
  margin: 0 0 12px;
  font-size: 1rem;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 8px;
}

.nav-link {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--text);
  text-decoration: none;
  background: transparent;
  border: 1px solid transparent;
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    background-color 160ms ease;
  word-break: break-word;
}

.nav-link:hover {
  transform: translateX(3px);
  border-color: rgba(143, 78, 34, 0.2);
  background: rgba(143, 78, 34, 0.06);
}

.nav-link.is-active {
  background: var(--primary-soft);
  border-color: rgba(143, 78, 34, 0.26);
  color: var(--primary);
  font-weight: 700;
}

.nav-empty,
.empty-nav {
  color: var(--muted);
  font-size: 0.95rem;
}

.hero {
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}

.doc-content {
  width: min(100%, 860px);
}

.doc-content h1,
.doc-content h2,
.doc-content h3,
.doc-content h4,
.doc-content h5,
.doc-content h6 {
  scroll-margin-top: 24px;
  margin: 1.5em 0 0.65em;
  line-height: 1.2;
}

.doc-content p,
.doc-content li,
.doc-content blockquote {
  line-height: 1.8;
  color: #2d241a;
}

.doc-content a {
  color: var(--primary);
}

.doc-content img {
  max-width: 100%;
  display: block;
  margin: 22px 0;
  border-radius: 18px;
  border: 1px solid var(--line);
}

.doc-content pre {
  overflow: auto;
  padding: 18px;
  border-radius: 18px;
  background: #1f1a16;
  color: #f6eede;
}

.doc-content code {
  padding: 0.14rem 0.42rem;
  border-radius: 8px;
  background: var(--code-bg);
  font-size: 0.92em;
}

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

.doc-content blockquote {
  margin: 22px 0;
  padding: 4px 0 4px 18px;
  border-left: 4px solid rgba(143, 78, 34, 0.4);
  color: var(--muted);
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  background: var(--panel-strong);
  border-radius: 16px;
  overflow: hidden;
}

.doc-content th,
.doc-content td {
  text-align: left;
  padding: 12px 14px;
  border: 1px solid var(--line);
}

.doc-content hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 28px 0;
}

.empty-state {
  padding: 28px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 250, 242, 0.9), rgba(246, 238, 225, 0.8));
  border: 1px dashed rgba(143, 78, 34, 0.24);
}

@media (max-width: 960px) {
  .shell {
    width: min(100vw, calc(100vw - 24px));
    margin: 12px auto;
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    max-height: none;
  }

  .content {
    padding: 22px;
  }

  .hero h2 {
    font-size: 2rem;
  }
}