:root {
  --bg: #ffffff;
  --panel: #f7fbf7;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --green-600: #16a34a;
  --green-700: #15803d;
  --green-50: #f0fdf4;
  --shadow: 0 10px 30px rgba(2, 6, 23, 0.08);
  --radius: 14px;
  --radius-sm: 10px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji",
    "Segoe UI Emoji";
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: linear-gradient(180deg, var(--bg), var(--green-50));
}

a {
  color: var(--green-700);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.app {
  height: 100vh;
  display: grid;
  grid-template-columns: 320px 1fr;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  border-right: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  padding: 18px 14px;
  overflow: auto;
}

.brand {
  padding: 10px 10px 14px 10px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, #ffffff, var(--green-50));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.brand-title {
  font-weight: 800;
  font-size: 18px;
  letter-spacing: 0.2px;
}

.brand-subtitle {
  margin-top: 4px;
  font-size: 12px;
  color: var(--muted);
}

.sidebar-actions {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.search {
  width: 100%;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: #fff;
  outline: none;
}

.search:focus {
  border-color: rgba(22, 163, 74, 0.6);
  box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.15);
}

.sidebar-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(22, 163, 74, 0.25);
  background: rgba(22, 163, 74, 0.06);
  color: var(--green-700);
  font-size: 12px;
}

.nav {
  margin-top: 12px;
  padding: 8px 6px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #fff;
}

.nav-loading {
  padding: 10px;
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 8px;
}

.section-title {
  font-size: 12px;
  color: var(--muted);
  text-transform: none;
  letter-spacing: 0.3px;
  margin: 8px 6px;
}

.nav a.item {
  display: block;
  padding: 8px 10px;
  border-radius: 10px;
  color: var(--text);
  border: 1px solid transparent;
  scroll-margin-top: 12px;
}

.nav a.item:hover {
  background: rgba(22, 163, 74, 0.06);
  border-color: rgba(22, 163, 74, 0.18);
  text-decoration: none;
}

.nav a.item.active {
  background: rgba(22, 163, 74, 0.10);
  border-color: rgba(22, 163, 74, 0.30);
}

.main {
  height: 100vh;
  overflow: auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 10px;
  align-items: center;
  padding: 12px 18px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.icon-btn {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
}

.icon-btn:hover {
  border-color: rgba(22, 163, 74, 0.35);
}

.crumb {
  color: var(--muted);
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toplink {
  font-size: 13px;
}

.content {
  max-width: 980px;
  margin: 0 auto;
  padding: 22px 22px 60px 22px;
}

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

/* Markdown 样式 */
.content h1,
.content h2,
.content h3 {
  scroll-margin-top: 90px;
}

.content h1 {
  font-size: 30px;
  margin: 10px 0 12px 0;
}

.content h2 {
  font-size: 22px;
  margin: 26px 0 12px 0;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.content h3 {
  font-size: 18px;
  margin: 18px 0 8px 0;
}

.content p,
.content li {
  line-height: 1.75;
}

.content blockquote {
  margin: 14px 0;
  padding: 10px 14px;
  border-left: 4px solid rgba(22, 163, 74, 0.5);
  background: rgba(22, 163, 74, 0.06);
  border-radius: 10px;
  color: #0b2a14;
}

.content code {
  font-family: var(--mono);
  font-size: 0.95em;
  background: rgba(2, 6, 23, 0.04);
  padding: 0.12em 0.32em;
  border-radius: 6px;
}

.content pre {
  padding: 14px;
  overflow: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #0b1220;
  color: #e2e8f0;
  box-shadow: var(--shadow);
}

.content pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.content table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.content th,
.content td {
  border-bottom: 1px solid var(--border);
  padding: 10px;
  text-align: left;
}

.content th {
  background: rgba(22, 163, 74, 0.06);
}

.footer {
  padding: 14px 18px;
  color: var(--muted);
  font-size: 12px;
  border-top: 1px solid var(--border);
}

/* 移动端 */
@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: min(92vw, 340px);
    transform: translateX(-105%);
    transition: transform 180ms ease;
    box-shadow: var(--shadow);
    z-index: 10;
  }

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

  .topbar {
    grid-template-columns: auto 1fr;
  }

  .toplink {
    display: none;
  }
}