:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --panel: #ffffff;
  --panel-soft: #f9fbfd;
  --ink: #172033;
  --muted: #5d697c;
  --border: #dfe5ee;
  --accent: #087f8c;
  --accent-strong: #065f6a;
  --accent-soft: #e6f6f7;
  --code: #102033;
  --shadow: 0 20px 55px rgba(18, 31, 50, 0.09);
  --sidebar: 282px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.72;
}

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

a:hover {
  color: var(--accent-strong);
}

.shell {
  min-height: 100vh;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar);
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: #ffffff;
  padding: 20px 18px 28px;
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  margin-bottom: 24px;
}

.brand-mark {
  display: grid;
  width: 44px;
  height: 40px;
  place-items: center;
  border-radius: 8px;
  background: #132033;
  color: #ffffff;
  font-size: 12px;
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  line-height: 1.2;
  font-size: 16px;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.brand .lab-name {
  color: #334155;
  font-weight: 700;
}

.section-nav {
  display: grid;
  gap: 2px;
}

.section-nav a {
  display: block;
  border-radius: 8px;
  color: #334155;
  font-size: 14px;
  line-height: 1.36;
  padding: 8px 10px;
}

.section-nav a:hover,
.section-nav a.active {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.section-nav a.subitem {
  margin-left: 12px;
  color: #64748b;
  font-size: 13px;
  padding: 6px 10px;
}

.loading {
  color: var(--muted);
  font-size: 14px;
}

.page {
  min-width: 0;
  padding-left: var(--sidebar);
}

.topbar {
  position: sticky;
  top: 0;
  display: none;
  align-items: center;
  gap: 12px;
  height: 58px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  padding: 0 18px;
  z-index: 15;
}

.topbar-brand {
  min-width: 0;
  overflow: hidden;
  color: var(--ink);
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-lab {
  flex: none;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.repo-link {
  margin-left: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--ink);
  font-size: 13px;
  line-height: 1;
  padding: 8px 10px;
}

.icon-button {
  display: inline-grid;
  width: 38px;
  height: 38px;
  place-content: center;
  gap: 4px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
  cursor: pointer;
}

.icon-button span {
  display: block;
  width: 17px;
  height: 2px;
  border-radius: 999px;
  background: var(--ink);
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 920px);
  width: min(100%, 1020px);
  margin: 0 auto;
  padding: 54px 32px 96px;
}

.content-column {
  min-width: 0;
}

.lab-strip {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
  padding: 16px 18px;
}

.lab-strip strong,
.lab-strip small {
  display: block;
}

.lab-strip strong {
  color: #111827;
  font-size: 16px;
  line-height: 1.3;
}

.lab-strip small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.35;
}

.manual {
  min-width: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
  padding: 48px 54px 64px;
}

.intro {
  border-bottom: 1px solid var(--border);
  margin-bottom: 34px;
  padding-bottom: 28px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

.manual h1 {
  margin: 0 0 18px;
  color: #0f172a;
  font-size: 40px;
  line-height: 1.18;
  letter-spacing: 0;
}

.manual h2 {
  border-top: 1px solid var(--border);
  margin: 44px 0 18px;
  padding-top: 32px;
  color: #111827;
  font-size: 27px;
  line-height: 1.28;
  letter-spacing: 0;
  scroll-margin-top: 84px;
}

.manual h2:first-child,
.manual .intro + h2 {
  border-top: 0;
  margin-top: 0;
  padding-top: 0;
}

.manual h3 {
  margin: 30px 0 12px;
  color: #1e293b;
  font-size: 20px;
  line-height: 1.34;
  letter-spacing: 0;
  scroll-margin-top: 84px;
}

.manual p {
  margin: 0 0 16px;
}

.manual ul,
.manual ol {
  margin: 0 0 18px;
  padding-left: 24px;
}

.manual li + li {
  margin-top: 6px;
}

.manual blockquote {
  margin: 22px 0;
  border-left: 4px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: var(--accent-soft);
  color: #17444a;
  padding: 14px 18px;
}

.manual blockquote p:last-child {
  margin-bottom: 0;
}

.manual code {
  border: 1px solid #d6e1eb;
  border-radius: 6px;
  background: #f3f7fb;
  color: #17324d;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
  padding: 0.12em 0.38em;
}

.manual pre {
  overflow: auto;
  border-radius: 8px;
  background: var(--code);
  color: #e7eef8;
  margin: 20px 0 24px;
  padding: 18px 20px;
}

.manual pre code {
  border: 0;
  background: transparent;
  color: inherit;
  font-size: 14px;
  line-height: 1.68;
  padding: 0;
}

.manual img {
  display: block;
  width: 100%;
  height: auto;
  margin: 24px 0 30px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
}

.manual table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 22px 0;
}

.manual th,
.manual td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.manual th {
  background: var(--panel-soft);
}

body.nav-open .sidebar {
  transform: translateX(0);
}

body.nav-open::after {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.32);
  content: "";
  z-index: 10;
}

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    max-width: 920px;
  }
}

@media (max-width: 860px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 180ms ease;
    box-shadow: var(--shadow);
  }

  .page {
    padding-left: 0;
  }

  .topbar {
    display: flex;
  }

  .layout {
    padding: 24px 14px 64px;
  }

  .manual {
    padding: 30px 20px 42px;
  }

  .lab-strip {
    margin: 0 0 14px;
  }

  .manual h1 {
    font-size: 30px;
  }

  .manual h2 {
    font-size: 23px;
  }
}

@media (max-width: 520px) {
  .sidebar {
    width: min(86vw, 320px);
  }

  .manual {
    border-radius: 0;
    padding: 26px 16px 36px;
  }

  .layout {
    padding-inline: 0;
  }

  .repo-link {
    display: none;
  }

  .topbar-lab {
    display: none;
  }

  .lab-strip {
    border-radius: 0;
    padding-inline: 16px;
  }
}