:root {
  --doc-bg: #09090d;
  --doc-panel: #111119;
  --doc-panel-soft: rgba(255, 255, 255, 0.045);
  --doc-panel-hover: rgba(255, 255, 255, 0.07);
  --doc-line: rgba(255, 255, 255, 0.1);
  --doc-line-strong: rgba(232, 180, 75, 0.32);
  --doc-text: #ece7de;
  --doc-muted: #a39d92;
  --doc-dim: #7d766d;
  --doc-amber: #e8b44b;
  --doc-teal: #56bcb4;
  --doc-coral: #d78270;
  --doc-radius: 8px;
  --doc-serif: "Noto Serif SC", "STSong", "Songti SC", "SimSun", serif;
  --doc-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--doc-text);
  background:
    repeating-linear-gradient(
      180deg,
      rgba(255, 255, 255, 0.025) 0,
      rgba(255, 255, 255, 0.025) 1px,
      transparent 1px,
      transparent 34px
    ),
    var(--doc-bg);
  font-family: var(--doc-sans);
  line-height: 1.82;
  -webkit-font-smoothing: antialiased;
}

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

strong {
  color: var(--doc-text);
}

.doc-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  min-height: 72px;
  padding: 0 56px;
  border-bottom: 1px solid var(--doc-line);
  background: rgba(9, 9, 13, 0.92);
  backdrop-filter: blur(18px);
}

.doc-brand,
.doc-nav__links {
  display: flex;
  align-items: center;
}

.doc-brand {
  gap: 0;
  font-weight: 800;
}

.doc-brand img {
  width: clamp(118px, 13vw, 176px);
  height: auto;
  max-height: 56px;
  object-fit: contain;
}

.doc-nav__links {
  gap: 20px;
  color: var(--doc-muted);
  font-size: 0.9rem;
}

.doc-nav__links a:hover {
  color: var(--doc-text);
}

.doc-launch {
  padding: 8px 13px;
  border: 1px solid rgba(232, 180, 75, 0.38);
  border-radius: var(--doc-radius);
  color: var(--doc-amber);
}

.doc-shell {
  width: min(1160px, calc(100% - 44px));
  margin: 0 auto;
}

.doc-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 40px;
  align-items: end;
  padding: 76px 0 44px;
  border-bottom: 1px solid var(--doc-line);
}

.doc-kicker {
  color: var(--doc-teal);
  font-size: 0.9rem;
  font-weight: 800;
}

.doc-hero h1 {
  max-width: 820px;
  margin: 16px 0 18px;
  font-family: var(--doc-serif);
  font-size: 4.1rem;
  line-height: 1.08;
  letter-spacing: 0;
}

.doc-hero p {
  max-width: 760px;
  margin: 0;
  color: var(--doc-muted);
  font-size: 1.08rem;
}

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.doc-meta span {
  padding: 6px 10px;
  border: 1px solid var(--doc-line);
  border-radius: var(--doc-radius);
  color: var(--doc-muted);
  font-size: 0.82rem;
}

.doc-hero-panel {
  border: 1px solid var(--doc-line);
  border-radius: var(--doc-radius);
  background: var(--doc-panel-soft);
  padding: 20px;
}

.doc-panel-label {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  color: var(--doc-dim);
  font-size: 0.78rem;
}

.doc-flow {
  display: grid;
  gap: 10px;
}

.doc-flow__row {
  display: grid;
  grid-template-columns: 78px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--doc-line);
  border-radius: var(--doc-radius);
  background: rgba(0, 0, 0, 0.16);
}

.doc-flow__row b {
  color: var(--doc-amber);
  font-size: 0.82rem;
}

.doc-flow__row span {
  color: var(--doc-muted);
  font-size: 0.88rem;
}

.doc-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 44px;
  padding: 42px 0 82px;
}

.doc-toc {
  position: sticky;
  top: 104px;
  align-self: start;
  padding: 18px;
  border: 1px solid var(--doc-line);
  border-radius: var(--doc-radius);
  background: var(--doc-panel-soft);
}

.doc-toc b {
  display: block;
  margin-bottom: 10px;
  color: var(--doc-amber);
}

.doc-toc a {
  display: block;
  padding: 7px 0;
  color: var(--doc-muted);
  font-size: 0.9rem;
}

.doc-toc a:hover {
  color: var(--doc-text);
}

.doc-article {
  min-width: 0;
}

.doc-article section {
  padding: 0 0 34px;
}

.doc-article h2 {
  margin: 0 0 14px;
  font-size: 2rem;
  line-height: 1.35;
  letter-spacing: 0;
}

.doc-article h3 {
  margin: 26px 0 10px;
  color: var(--doc-amber);
  font-size: 1.08rem;
}

.doc-article p {
  margin: 0 0 16px;
  color: var(--doc-muted);
}

.doc-article ul {
  margin: 0 0 18px;
  padding-left: 20px;
  color: var(--doc-muted);
}

.doc-article li {
  margin: 8px 0;
}

.doc-callout {
  margin: 24px 0;
  padding: 18px 20px;
  border: 1px solid rgba(86, 188, 180, 0.32);
  border-left: 3px solid var(--doc-teal);
  border-radius: var(--doc-radius);
  background: rgba(86, 188, 180, 0.08);
  color: var(--doc-text);
}

.doc-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 24px 0;
}

.doc-strip__item,
.doc-card,
.doc-index-card {
  border: 1px solid var(--doc-line);
  border-radius: var(--doc-radius);
  background: var(--doc-panel-soft);
}

.doc-strip__item {
  padding: 16px;
}

.doc-strip__item b {
  display: block;
  margin-bottom: 8px;
  color: var(--doc-amber);
}

.doc-strip__item p {
  margin: 0;
  font-size: 0.9rem;
}

.doc-cards,
.doc-index-grid {
  display: grid;
  gap: 16px;
}

.doc-cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 28px;
}

.doc-card,
.doc-index-card {
  padding: 20px;
  transition:
    transform 0.22s ease,
    background 0.22s ease,
    border-color 0.22s ease;
}

.doc-card:hover,
.doc-index-card:hover {
  transform: translateY(-4px);
  border-color: var(--doc-line-strong);
  background: var(--doc-panel-hover);
}

.doc-card span,
.doc-index-card span {
  color: var(--doc-coral);
  font-size: 0.82rem;
  font-weight: 800;
}

.doc-card h3,
.doc-index-card h2 {
  margin: 10px 0 8px;
  color: var(--doc-text);
  line-height: 1.35;
}

.doc-card h3 {
  font-size: 1.1rem;
}

.doc-index-card h2 {
  font-size: 1.35rem;
}

.doc-card p,
.doc-index-card p {
  margin: 0;
  color: var(--doc-muted);
  font-size: 0.92rem;
}

.doc-index-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 42px 0 82px;
}

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

.doc-table-wrap {
  width: 100%;
  margin: 24px 0;
  overflow-x: auto;
  border-radius: var(--doc-radius);
}

.doc-table-wrap .doc-table {
  min-width: 720px;
  margin: 0;
}

.doc-table th,
.doc-table td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--doc-line);
  color: var(--doc-muted);
  text-align: left;
  vertical-align: top;
}

.doc-table th {
  color: var(--doc-text);
  background: rgba(255, 255, 255, 0.045);
}

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

.doc-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0 42px;
  border-top: 1px solid var(--doc-line);
  color: var(--doc-dim);
  font-size: 0.9rem;
}

.doc-footer a {
  color: var(--doc-muted);
}

@media (max-width: 980px) {
  .doc-nav {
    padding: 0 28px;
  }

  .doc-hero {
    grid-template-columns: 1fr;
  }

  .doc-hero h1 {
    font-size: 3.1rem;
  }

  .doc-layout {
    grid-template-columns: 1fr;
  }

  .doc-toc {
    position: static;
  }

  .doc-index-grid,
  .doc-cards,
  .doc-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .doc-nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 20px;
  }

  .doc-nav__links {
    flex-wrap: wrap;
    gap: 12px;
  }

  .doc-shell {
    width: min(100% - 28px, 1160px);
  }

  .doc-hero {
    padding-top: 52px;
  }

  .doc-hero h1 {
    font-size: 2.25rem;
  }

  .doc-hero p {
    font-size: 1rem;
  }
}