* { box-sizing: border-box; }

:root {
  --bg: #f6f8fb;
  --panel: #ffffff;
  --panel-soft: #f9fbff;
  --line: #e6ebf2;
  --text: #1f2937;
  --muted: #667085;
  --blue: #246bff;
  --blue-soft: #eef4ff;
  --navy: #101828;
  --success-bg: #eefbf3;
  --success-text: #1d7a46;
  --warn-bg: #fff6e8;
  --warn-text: #b4690e;
  --shadow: 0 16px 40px rgba(16, 24, 40, 0.06);
  --topbar-h: 72px;
  --sidebar-w: 320px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 14px;
}

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

body {
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 24px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  object-fit: contain;
}

.brand strong {
  display: block;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.15;
}

.brand span {
  display: block;
  margin-top: 3px;
  font-size: 12px;
  color: var(--muted);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: min(520px, 52vw);
  justify-content: flex-end;
}

.search {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 200px;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel-soft);
  color: var(--muted);
  font-size: 14px;
}

.kbd {
  margin-left: auto;
  padding: 2px 8px;
  border: 1px solid #d8e1ef;
  border-bottom-width: 2px;
  border-radius: 8px;
  font-size: 12px;
  background: #fff;
  color: #7a8699;
}

.site-chip {
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: calc(100vh - var(--topbar-h));
}

.sidebar {
  position: sticky;
  top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  overflow: auto;
  padding: 22px 16px 24px;
  border-right: 1px solid var(--line);
  background: #fbfcfe;
}

.sidebar-title {
  padding: 0 10px 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-group {
  margin-bottom: 16px;
}

.nav-head {
  padding: 10px 10px 8px;
  color: var(--navy);
  font-size: 14px;
  font-weight: 800;
}

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

.nav-list a {
  display: block;
  padding: 9px 12px;
  border-radius: 12px;
  color: #475467;
  font-size: 14px;
  line-height: 1.45;
}

.nav-list a:hover {
  background: #f0f4fa;
}

.nav-list a.active {
  background: var(--blue-soft);
  color: var(--blue);
  font-weight: 700;
}

.content {
  padding: 28px;
  min-width: 0;
}

.doc-shell {
  max-width: 980px;
  margin: 0 auto;
  display: grid;
  gap: 18px;
}

.doc-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.crumbs {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #fbfdff 0%, #f6f9ff 100%);
  color: var(--muted);
  font-size: 13px;
}

.crumbs strong {
  color: var(--text);
}

.article {
  padding: 28px 24px 30px;
}

.toc {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: #f5f8fd;
  color: #475467;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.doc-title {
  margin: 18px 0 12px;
  font-size: clamp(32px, 4vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.lead {
  margin: 0 0 24px;
  font-size: 17px;
  line-height: 1.8;
  color: #475467;
}

.doc-body {
  display: grid;
  gap: 22px;
}

.doc-body h2 {
  margin: 0 0 12px;
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.doc-body h3 {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.3;
}

.doc-body p {
  margin: 0 0 12px;
  color: #475467;
  line-height: 1.85;
  font-size: 15px;
}

.doc-body ul,
.doc-body ol {
  margin: 0;
  padding-left: 20px;
  color: #475467;
  line-height: 1.8;
}

.doc-body li + li {
  margin-top: 8px;
}

.section-block + .section-block {
  padding-top: 8px;
  border-top: 1px solid #f0f3f8;
}

.callout {
  display: grid;
  gap: 12px;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid #d9e6ff;
  background: linear-gradient(180deg, #f8fbff 0%, #eef5ff 100%);
}

.callout.success {
  background: linear-gradient(180deg, #f4fff8 0%, var(--success-bg) 100%);
  border-color: #d6f2e1;
}

.callout.warning {
  background: linear-gradient(180deg, #fffaf2 0%, var(--warn-bg) 100%);
  border-color: #f8e2bd;
}

.callout strong {
  display: block;
  font-size: 16px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.stat-card,
.info-card,
.tool-card {
  padding: 18px;
  border-radius: var(--radius-md);
  background: #fbfcff;
  border: 1px solid var(--line);
}

.stat-card strong,
.info-card strong,
.tool-card strong {
  display: block;
  margin-bottom: 10px;
  font-size: 13px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.stat-card span,
.info-card span,
.tool-card span {
  display: block;
  font-size: 15px;
  line-height: 1.75;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.code-block {
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid #d5def0;
  background: #0b1736;
}

.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  color: #dbe5ff;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.code-block pre {
  margin: 0;
  padding: 16px;
  overflow: auto;
  color: #dbe5ff;
  line-height: 1.7;
  font-size: 13px;
  font-family: "Cascadia Code", Consolas, monospace;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-size: 14px;
  line-height: 1.6;
}

th {
  background: #f8fbff;
  color: #344054;
  font-weight: 700;
}

tr:last-child td {
  border-bottom: 0;
}

.pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.pager a {
  display: block;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.pager-label {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.pager-title {
  display: block;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
}

@media (max-width: 1080px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
}

@media (max-width: 720px) {
  .topbar {
    height: auto;
    align-items: flex-start;
    flex-direction: column;
    padding: 16px;
  }

  .topbar-actions {
    width: 100%;
    min-width: 0;
  }

  .layout {
    min-height: auto;
  }

  .content {
    padding: 16px;
  }

  .article {
    padding: 22px 18px 24px;
  }

  .search {
    min-width: 0;
  }

  .stat-grid,
  .tool-grid,
  .pager {
    grid-template-columns: 1fr;
  }
}