:root {
  --bg: #f6f7f8;
  --panel: #ffffff;
  --text: #202428;
  --muted: #6a737d;
  --line: #dde2e7;
  --accent: #116b5f;
  --accent-soft: #e5f3f0;
  --danger: #a33d2f;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

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

a:hover {
  text-decoration: underline;
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 310px;
  background: var(--panel);
  border-right: 1px solid var(--line);
  overflow: auto;
  padding: 18px 14px;
}

.brand {
  padding: 4px 8px 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
}

.brand-subtitle {
  color: var(--muted);
  font-size: 13px;
}

.search {
  width: 100%;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0 10px;
  margin-bottom: 14px;
  background: #fbfcfd;
}

.nav-section {
  margin: 0 0 18px;
}

.nav-section h2 {
  margin: 0 8px 7px;
  font-size: 12px;
  color: var(--muted);
  font-weight: 700;
}

.nav-link {
  display: block;
  padding: 6px 8px;
  border-radius: 7px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-link.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 650;
}

.content {
  margin-left: 310px;
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  gap: 10px;
  align-items: center;
  min-height: 48px;
  padding: 0 32px;
  background: rgba(246, 247, 248, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
  color: var(--muted);
  font-size: 13px;
}

.markdown-body {
  max-width: 1080px;
  padding: 28px 34px 80px;
  margin: 0 auto;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  line-height: 1.3;
}

.markdown-body h1 {
  margin: 0 0 22px;
  font-size: 28px;
}

.markdown-body h2 {
  margin-top: 34px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--line);
  font-size: 21px;
}

.markdown-body h3 {
  margin-top: 24px;
  font-size: 17px;
}

.markdown-body blockquote {
  margin: 16px 0;
  padding: 10px 14px;
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  color: #24423e;
}

.markdown-body table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 16px 0 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.markdown-body th,
.markdown-body td {
  border: 1px solid var(--line);
  padding: 8px 10px;
  vertical-align: top;
}

.markdown-body th {
  background: #edf1f3;
  text-align: left;
  white-space: nowrap;
}

.markdown-body code {
  background: #eef1f4;
  border-radius: 5px;
  padding: 2px 5px;
}

.markdown-body pre {
  overflow: auto;
  background: #1f2428;
  color: #f2f4f6;
  padding: 14px;
  border-radius: 8px;
}

.markdown-body .mermaid {
  overflow-x: auto;
  margin: 16px 0 28px;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.markdown-body .mermaid svg {
  max-width: 100%;
  height: auto;
}

@media (max-width: 820px) {
  .sidebar {
    position: static;
    width: auto;
    max-height: 46vh;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .content {
    margin-left: 0;
  }

  .topbar {
    padding: 0 18px;
  }

  .markdown-body {
    padding: 22px 18px 64px;
  }
}