:root {
  --bg: #f6f4ef;
  --panel: #ffffff;
  --panel-soft: #faf8f3;
  --ink: #1d232b;
  --muted: #5f6975;
  --line: #dde3ea;
  --accent: #1d5b57;
  --code-bg: #f1eee8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.7;
}

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

a:hover {
  text-decoration: underline;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(246, 244, 239, 0.96);
  backdrop-filter: blur(8px);
}

.topbar-inner {
  width: min(1400px, calc(100vw - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
}

.topbar h1,
.topbar p {
  margin: 0;
}

.title-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.kicker,
.sidebar-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.doc-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--ink);
  white-space: nowrap;
}

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

.meta-chip {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  font-size: 13px;
  color: var(--muted);
}

.meta-chip strong {
  color: var(--ink);
  font-weight: 600;
}

.page {
  width: min(1400px, calc(100vw - 32px));
  margin: 0 auto;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
  padding: 24px 0 48px;
}

.sidebar {
  position: sticky;
  top: 92px;
  align-self: start;
}

.sidebar-card,
.document {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
}

.sidebar-card {
  padding: 18px;
}

.toc {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
}

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

.toc a.level-2 {
  font-weight: 600;
  color: var(--ink);
}

.toc a.level-3 {
  padding-left: 12px;
}

.document {
  padding: 36px 40px;
}

.loading {
  color: var(--muted);
}

.document h1,
.document h2,
.document h3,
.document h4 {
  margin-top: 1.6em;
  margin-bottom: 0.55em;
  line-height: 1.3;
}

.document h1 {
  margin-top: 0;
  font-size: 2rem;
}

.document h2 {
  font-size: 1.5rem;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.document h3 {
  font-size: 1.15rem;
}

.document p {
  margin: 0 0 1em;
}

.document ul,
.document ol {
  margin: 0 0 1em 1.4em;
  padding: 0;
}

.document li {
  margin: 0.2em 0;
}

.document blockquote {
  margin: 0 0 1em;
  padding: 12px 16px;
  border-left: 4px solid var(--accent);
  background: var(--panel-soft);
  color: var(--muted);
}

.document code {
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--code-bg);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.92em;
}

.document pre {
  overflow-x: auto;
  padding: 16px;
  border-radius: 12px;
  background: var(--code-bg);
  border: 1px solid var(--line);
}

.document pre code {
  padding: 0;
  background: transparent;
}

.document hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 24px 0;
}

@media (max-width: 980px) {
  .page {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }
}

@media (max-width: 680px) {
  .topbar-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .doc-meta {
    gap: 8px;
  }

  .page,
  .topbar-inner {
    width: min(100vw - 20px, 1400px);
  }

  .document {
    padding: 22px 18px;
  }
}