:root {
  --bg: #e7edf0;
  --panel: rgba(251, 252, 253, 0.96);
  --panel-strong: #ffffff;
  --panel-subtle: #f4f7f8;
  --text: #18232d;
  --text-strong: #101820;
  --muted: #61707c;
  --muted-strong: #465561;
  --accent: #2a4c5e;
  --accent-strong: #183546;
  --accent-soft: rgba(42, 76, 94, 0.08);
  --line: #d6dde2;
  --line-strong: #c2ccd4;
  --code-bg: #edf1f3;
  --shadow: 0 18px 40px rgba(17, 25, 33, 0.06);
  --shadow-soft: 0 10px 24px rgba(17, 25, 33, 0.04);
  --radius-xl: 18px;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(42, 76, 94, 0.06), transparent 24%),
    linear-gradient(180deg, #f4f6f8 0%, var(--bg) 52%, #e3e9ed 100%);
}

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

.shell {
  width: min(1500px, calc(100vw - 48px));
  margin: 24px auto;
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
  gap: 18px;
}

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

.sidebar {
  position: sticky;
  top: 24px;
  align-self: start;
  max-height: calc(100vh - 48px);
  overflow: auto;
  padding: 22px 18px 20px;
}

.content {
  padding: 28px 32px 36px;
}

.brand {
  padding-bottom: 16px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section-label {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.brand h1 {
  margin: 0;
  line-height: 1.14;
  color: var(--text-strong);
}

.brand h1 {
  font-size: 1.72rem;
  font-weight: 700;
}

.summary,
.search-summary {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.search-panel {
  margin-bottom: 18px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(244, 247, 248, 0.98), rgba(251, 252, 253, 0.98));
  box-shadow: var(--shadow-soft);
}

.search-head {
  display: grid;
  gap: 6px;
  margin-bottom: 10px;
}

.search-label {
  font-size: 0.94rem;
  font-weight: 700;
  color: var(--text-strong);
}

.search-summary {
  margin: 0;
}

.search-input-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.search-input {
  width: 100%;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--panel-strong);
  color: var(--text);
  font-size: 0.92rem;
  outline: none;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    background-color 160ms ease;
}

.search-input::placeholder {
  color: #7b8793;
}

.search-input:focus {
  border-color: rgba(42, 76, 94, 0.45);
  box-shadow: 0 0 0 4px rgba(42, 76, 94, 0.1);
}

.search-clear {
  flex: none;
  padding: 10px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--panel-strong);
  color: var(--muted-strong);
  font-weight: 700;
  cursor: pointer;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    color 160ms ease;
}

.search-clear:hover {
  border-color: rgba(42, 76, 94, 0.28);
  background: var(--panel-subtle);
  color: var(--accent-strong);
}

.search-clear[hidden] {
  display: none;
}

.nav {
  display: grid;
  gap: 14px;
}

.nav-group {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.nav-group:first-child {
  padding-top: 0;
  border-top: 0;
}

.nav-group-title {
  margin: 0 0 8px;
  color: var(--muted-strong);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 2px;
}

.nav-link,
.search-result {
  display: block;
  color: inherit;
  text-decoration: none;
  word-break: break-word;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    box-shadow 160ms ease;
}

.nav-link {
  padding: 7px 10px 7px 12px;
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.45;
}

.nav-link:hover,
.search-result:hover {
  background: var(--accent-soft);
}

.nav-link.is-active {
  border-left-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 700;
}

.search-results {
  display: grid;
  gap: 12px;
}

.search-result {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel-strong);
}

.search-result:hover {
  border-color: rgba(42, 76, 94, 0.22);
  box-shadow: var(--shadow-soft);
}

.search-result.is-active {
  border-color: rgba(42, 76, 94, 0.3);
  background: linear-gradient(180deg, rgba(42, 76, 94, 0.08), rgba(255, 255, 255, 0.98));
  box-shadow: var(--shadow-soft);
}

.search-result-group,
.search-result-meta {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
}

.search-result-title {
  display: block;
  margin-top: 6px;
  color: var(--text-strong);
  font-size: 1rem;
  line-height: 1.4;
}

.search-result-snippet {
  display: block;
  margin-top: 10px;
  color: var(--muted-strong);
  font-size: 0.9rem;
  line-height: 1.65;
}

.nav-empty,
.empty-nav {
  padding: 16px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  color: var(--muted);
  font-size: 0.94rem;
  background: var(--panel-subtle);
}

.doc-content {
  width: min(100%, 920px);
}

.doc-content > :first-child {
  margin-top: 0;
}

.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 0.7em;
  line-height: 1.25;
  color: var(--text-strong);
}

.doc-content p,
.doc-content li,
.doc-content blockquote {
  line-height: 1.85;
  color: var(--text);
}

.doc-content a {
  color: var(--accent);
  text-underline-offset: 0.16em;
}

.doc-content img {
  display: block;
  max-width: 100%;
  margin: 20px 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-strong);
  box-shadow: var(--shadow-soft);
}

.doc-content pre {
  overflow: auto;
  padding: 18px;
  border-radius: 14px;
  background: #17232d;
  color: #e7eef4;
}

.doc-content code {
  padding: 0.15rem 0.42rem;
  border-radius: 6px;
  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: 6px 0 6px 16px;
  border-left: 3px solid rgba(42, 76, 94, 0.28);
  background: rgba(42, 76, 94, 0.04);
  color: var(--muted-strong);
}

.doc-content table {
  width: 100%;
  margin: 24px 0;
  border-collapse: collapse;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: var(--panel-strong);
}

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

.doc-content th {
  background: rgba(42, 76, 94, 0.06);
  color: var(--text-strong);
}

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

.empty-state {
  padding: 26px 28px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--panel-subtle);
}

.empty-state h3 {
  margin: 0 0 12px;
  color: var(--text-strong);
}

.empty-state p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.nav-link:focus-visible,
.search-result:focus-visible,
.search-input:focus-visible,
.search-clear:focus-visible {
  outline: none;
  box-shadow: 0 0 0 4px rgba(42, 76, 94, 0.12);
}

@media (max-width: 1080px) {
  .shell {
    grid-template-columns: 276px minmax(0, 1fr);
  }
}

@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: 24px;
  }

  .search-input-wrap {
    flex-direction: column;
    align-items: stretch;
  }
}