:root {
  --bg: #0f1419;
  --bg2: #1a2332;
  --bg3: #243044;
  --fg: #e7ecf3;
  --fg-muted: #9aa8bc;
  --accent: #3d9cf0;
  --accent2: #5ad4a0;
  --border: #2d3a4f;
  --warn: #e8a838;
  --card: #162032;
  --link: #6eb6ff;
  --code-bg: #0a0e14;
  --sidebar-w: 260px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.65;
  font-size: 15px;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg2);
  border-right: 1px solid var(--border);
  padding: 1rem 0.85rem 2rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}
.sidebar .brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--fg);
  display: block;
  margin-bottom: 0.35rem;
  padding: 0 0.35rem;
}
.sidebar .brand-sub {
  font-size: 0.75rem;
  color: var(--fg-muted);
  padding: 0 0.35rem 0.9rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.75rem;
}
.sidebar nav a {
  display: block;
  padding: 0.4rem 0.55rem;
  border-radius: 6px;
  color: var(--fg-muted);
  font-size: 0.9rem;
  margin-bottom: 2px;
}
.sidebar nav a:hover, .sidebar nav a.active {
  background: var(--bg3);
  color: var(--fg);
  text-decoration: none;
}
.sidebar nav a.active { border-left: 3px solid var(--accent); }
.sidebar .count {
  float: right;
  color: var(--fg-muted);
  font-size: 0.75rem;
}
.main {
  flex: 1;
  min-width: 0;
  padding: 1.25rem 1.75rem 3rem;
  max-width: 980px;
}
.topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--border);
}
.topbar h1 {
  margin: 0;
  font-size: 1.45rem;
  font-weight: 700;
}
.search-wrap { position: relative; }
#q {
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 8px;
  padding: 0.45rem 0.75rem;
  width: min(280px, 100%);
  font-size: 0.9rem;
}
#q:focus { outline: 2px solid var(--accent); border-color: transparent; }
.theme-section { margin-bottom: 2rem; }
.theme-section h2 {
  font-size: 1.2rem;
  margin: 0 0 0.35rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}
.theme-section .tdesc {
  color: var(--fg-muted);
  font-size: 0.85rem;
  margin: 0 0 0.85rem;
}
.card-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.55rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 0.95rem;
  transition: border-color 0.15s;
}
.card:hover { border-color: var(--accent); }
.card a.title {
  font-weight: 600;
  color: var(--fg);
  font-size: 0.98rem;
}
.card a.title:hover { color: var(--accent); }
.card .summary {
  margin: 0.35rem 0 0;
  color: var(--fg-muted);
  font-size: 0.86rem;
}
.card .meta {
  margin-top: 0.35rem;
  font-size: 0.75rem;
  color: var(--fg-muted);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.article-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: space-between;
  margin: 1rem 0 1.5rem;
  font-size: 0.88rem;
}
.article-nav .spacer { flex: 1; }
.crumb {
  font-size: 0.85rem;
  color: var(--fg-muted);
  margin-bottom: 0.75rem;
}
.crumb a { color: var(--fg-muted); }
.crumb a:hover { color: var(--link); }
.content h1 { font-size: 1.55rem; margin-top: 0; line-height: 1.3; }
.content h2 {
  font-size: 1.2rem;
  margin-top: 1.75rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--border);
}
.content h3 { font-size: 1.05rem; margin-top: 1.35rem; color: #c5d4e8; }
.content h4 { font-size: 0.98rem; margin-top: 1.1rem; color: #b0c0d4; }
.content blockquote {
  margin: 0.85rem 0;
  padding: 0.55rem 0.9rem;
  border-left: 3px solid var(--accent);
  background: var(--bg2);
  color: var(--fg-muted);
  border-radius: 0 6px 6px 0;
}
.content table {
  border-collapse: collapse;
  width: 100%;
  margin: 0.85rem 0;
  font-size: 0.86rem;
  display: block;
  overflow-x: auto;
  max-width: 100%;
}
.content th, .content td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.55rem;
  text-align: left;
  vertical-align: top;
}
.content th { background: var(--bg3); white-space: nowrap; }
.content tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
.content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.86em;
  background: var(--code-bg);
  padding: 0.12em 0.35em;
  border-radius: 4px;
  border: 1px solid var(--border);
}
.content pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  line-height: 1.45;
}
.content pre code {
  border: none;
  padding: 0;
  background: none;
  font-size: 0.82rem;
}
.content img { max-width: 100%; height: auto; }
.content hr { border: none; border-top: 1px solid var(--border); margin: 1.5rem 0; }
.content ul, .content ol { padding-left: 1.35rem; }
.content li { margin: 0.25rem 0; }
.toc {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin: 1rem 0 1.5rem;
  font-size: 0.88rem;
}
.toc .toctitle { font-weight: 600; margin-bottom: 0.35rem; color: var(--fg-muted); }
.toc ul { margin: 0.25rem 0; padding-left: 1.2rem; }
.footer {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--fg-muted);
}
.badge {
  display: inline-block;
  background: var(--bg3);
  color: var(--accent2);
  font-size: 0.72rem;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  margin-left: 0.35rem;
  vertical-align: middle;
}
.mobile-toggle {
  display: none;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--fg);
  border-radius: 6px;
  padding: 0.35rem 0.65rem;
  cursor: pointer;
  font-size: 0.85rem;
}
@media (max-width: 860px) {
  .layout { flex-direction: column; }
  .sidebar {
    position: relative;
    width: 100%;
    height: auto;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--border);
    display: none;
  }
  .sidebar.open { display: block; }
  .mobile-toggle { display: inline-block; }
  .main { padding: 1rem 1rem 2.5rem; }
  #q { width: 100%; }
}
.hidden { display: none !important; }