/* 拜云创新实验室藏文信息技术智库 */
:root {
  --by-primary: #1a4d6d;
  --by-primary-light: #2d6b8f;
  --by-accent: #c45c26;
  --by-text: #2c3e50;
  --by-text-muted: #5a6c7d;
  --by-bg: #fafbfc;
  --by-border: #e8ecf0;
  --by-sidebar-bg: #f4f6f8;
  --sidebar-w: 260px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--by-text);
  background: var(--by-bg);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: #fff;
  border-bottom: 1px solid var(--by-border);
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.brand {
  font-weight: 600;
  font-size: 1rem;
  color: var(--by-primary);
}

.nav-toggle {
  display: none;
  padding: 0.4rem 0.8rem;
  font-size: 1.2rem;
  background: transparent;
  border: 1px solid var(--by-border);
  border-radius: 4px;
  cursor: pointer;
  color: var(--by-text);
}

.layout {
  display: flex;
  min-height: calc(100vh - 52px - 40px);
}

.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--by-sidebar-bg);
  border-right: 1px solid var(--by-border);
  overflow-y: auto;
}

.nav {
  padding: 1rem 0;
}

.nav-group {
  padding: 0.5rem 1rem 0.25rem;
  margin-top: 0.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--by-primary);
  letter-spacing: 0.06em;
  border-left: 2px solid var(--by-border);
}

.nav-group:first-of-type { margin-top: 0; }

.nav-subgroup {
  padding: 0.35rem 1rem 0.15rem 1.25rem;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--by-text-muted);
}

.nav-item {
  display: block;
  padding: 0.35rem 1rem;
  color: var(--by-text);
  text-decoration: none;
  font-size: 0.9rem;
  border-left: 3px solid transparent;
}

.nav-item--sub {
  padding-left: 1.25rem;
  font-size: 0.85rem;
}

.nav-item:hover {
  background: rgba(0,0,0,0.04);
  color: var(--by-primary);
}

.nav-item.active {
  border-left-color: var(--by-primary);
  color: var(--by-primary);
  font-weight: 500;
}

.content {
  flex: 1;
  padding: 1.5rem 2rem;
  overflow-y: auto;
  background: #fff;
  margin: 0.5rem;
  margin-left: 0;
  border-radius: 6px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.page.hidden { display: none; }

.content h1 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--by-primary);
  margin-top: 0;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--by-border);
}

.content h2 {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--by-primary);
  margin-top: 1.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--by-border);
}

.content h3 { font-size: 1.2rem; margin-top: 1.5rem; }
.content h4, .content h5, .content h6 { font-size: 1.05rem; margin-top: 1.25rem; }

.content a {
  color: var(--by-primary-light);
  text-decoration: none;
}

.content a:hover { color: var(--by-accent); text-decoration: underline; }

.content ul, .content ol { padding-left: 1.5rem; margin: 1rem 0; }
.content li { margin-bottom: 0.35rem; }
.content p { margin: 1rem 0; }

.content pre, .content code {
  font-family: "JetBrains Mono", "Fira Code", Consolas, monospace;
  font-size: 0.9em;
}

.content pre {
  background: var(--by-sidebar-bg);
  padding: 1rem;
  border-radius: 4px;
  overflow-x: auto;
}

.content blockquote {
  border-left: 4px solid var(--by-primary-light);
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  background: var(--by-sidebar-bg);
  border-radius: 0 4px 4px 0;
  color: var(--by-text-muted);
}

.content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
  font-size: 0.95rem;
}

.content th, .content td {
  border: 1px solid var(--by-border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

.content th {
  background: var(--by-sidebar-bg);
  font-weight: 600;
  color: var(--by-primary);
}

.content tr:nth-child(even) { background: var(--by-bg); }

.site-footer {
  padding: 0.75rem 1rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--by-text-muted);
  background: var(--by-sidebar-bg);
  border-top: 1px solid var(--by-border);
}

/* 文档内 .md 链接改为站内导航 */
.content #doc a[href$=".md"] {
  color: var(--by-primary-light);
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .sidebar {
    position: fixed;
    left: 0;
    top: 52px;
    bottom: 0;
    z-index: 9;
    transform: translateX(-100%);
    transition: transform 0.2s;
  }
  .sidebar.open { transform: translateX(0); }
  .layout { padding: 0; }
  .content { margin: 0.5rem; }
}