/* 5-Lab overview 全站左边栏 */
.site-shell {
  display: flex;
  min-height: 100vh;
  align-items: stretch;
}

#siteSidebar.site-sidebar {
  width: 232px;
  flex-shrink: 0;
  background: var(--surface, #fff);
  border-right: 1px solid var(--border, #e8e5e0);
  padding: 1.1rem 0.85rem;
  position: sticky;
  top: 0;
  align-self: flex-start;
  height: 100vh;
  overflow-y: auto;
  box-sizing: border-box;
  z-index: 20;
}

.site-sidebar .brand {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--dim, #8b8680);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin: 0 0 0.85rem 0.15rem;
}

.site-sidebar .nav-section {
  margin-top: 0.85rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border, #e8e5e0);
}

.site-sidebar .nav-section:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.site-sidebar .nav-section-title {
  font-size: 0.68rem;
  color: var(--dim, #8b8680);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 0.35rem 0.15rem;
}

.site-sidebar nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem;
  padding: 0.52rem 0.65rem;
  margin: 0.15rem 0;
  border-radius: 8px;
  color: var(--text, #1a1a2e);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 550;
  border: 1px solid transparent;
  line-height: 1.35;
}

.site-sidebar nav a:hover {
  background: var(--soft, #fcfbfa);
  border-color: var(--border, #e8e5e0);
  color: var(--terracotta, #c96442);
}

.site-sidebar nav a.active {
  background: #fff7ed;
  border-color: #fed7aa;
  color: #9a3412;
}

.site-sidebar .ext-mark {
  flex-shrink: 0;
  font-size: 0.68rem;
  color: var(--dim, #8b8680);
  font-weight: 600;
  opacity: 0.85;
}

.site-main {
  flex: 1;
  min-width: 0;
}

@media (max-width: 900px) {
  .site-shell {
    flex-direction: column;
  }

  #siteSidebar.site-sidebar {
    width: 100%;
    height: auto;
    position: static;
    border-right: 0;
    border-bottom: 1px solid var(--border, #e8e5e0);
  }

  .site-sidebar nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
  }

  .site-sidebar nav a {
    margin: 0;
  }

  .site-sidebar .nav-section {
    margin-top: 0.65rem;
    padding-top: 0.55rem;
  }
}