/* 雪辰星航知识库 — 基础样式 */
:root {
  --kb-bg: #0b1220;
  --kb-surface: #121a2b;
  --kb-text: #e8eef8;
  --kb-muted: #9aa8bf;
  --kb-accent: #8eb6e8;
  --kb-accent-hover: #b7d0f2;
  --kb-accent-soft: rgba(142, 182, 232, 0.14);
  --kb-border: rgba(255, 255, 255, 0.08);
  --kb-max: 1120px;
  --kb-font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body.kb-page {
  margin: 0;
  font-family: var(--kb-font);
  background: var(--kb-bg);
  color: var(--kb-text);
  line-height: 1.7;
}

a {
  color: var(--kb-accent);
  text-decoration-color: rgba(142, 182, 232, 0.45);
  text-underline-offset: 0.18em;
}
a:hover {
  color: var(--kb-accent-hover);
  text-decoration-color: rgba(183, 208, 242, 0.7);
}

.kb-header, .kb-footer {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--kb-border);
}
.kb-footer { border-bottom: 0; border-top: 1px solid var(--kb-border); color: var(--kb-muted); }

.kb-topnav { display: flex; gap: 0.5rem; align-items: center; }
.kb-topnav a { text-decoration: none; }

.kb-shell {
  max-width: var(--kb-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1.5rem;
  padding: 1.25rem;
}

.kb-sidebar {
  background: var(--kb-surface);
  border: 1px solid var(--kb-border);
  border-radius: 8px;
  padding: 1rem;
  height: fit-content;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  position: sticky;
  top: 1rem;
}
.kb-sidebar a {
  color: var(--kb-text);
  text-decoration: none;
  display: block;
  padding: 0.25rem 0;
}
.kb-sidebar a:hover,
.kb-sidebar a[aria-current="page"] {
  color: var(--kb-accent-hover);
}
.kb-sidebar .kb-nav-cat {
  font-weight: 600;
  margin-top: 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
}
.kb-sidebar .kb-nav-cat a { display: inline; padding: 0; }
.kb-nav-count {
  color: var(--kb-muted);
  font-size: 0.8rem;
  font-weight: 500;
}
.kb-nav-group {
  margin-top: 0.85rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--kb-border);
}
.kb-nav-group[hidden],
.kb-cat-block[hidden] {
  display: none !important;
}

.kb-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.85rem;
}
.kb-filter__btn {
  appearance: none;
  border: 1px solid var(--kb-border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--kb-muted);
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
  line-height: 1.3;
}
.kb-filter__btn:hover {
  color: var(--kb-text);
  border-color: rgba(142, 182, 232, 0.35);
}
.kb-filter__btn.is-active {
  color: var(--kb-bg);
  background: var(--kb-accent);
  border-color: transparent;
}
.kb-filter-hint {
  color: var(--kb-muted);
  font-size: 0.95rem;
  margin: 0 0 1.25rem;
}
.kb-cat-block {
  margin-top: 1.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--kb-border);
}
.kb-cat-block:first-of-type {
  border-top: 0;
  margin-top: 0.5rem;
}
.kb-cat-block h2 {
  margin-bottom: 0.35rem;
}
.kb-cat-block h2 a {
  text-decoration: none;
  color: var(--kb-text);
}
.kb-cat-block h2 a:hover {
  color: var(--kb-accent-hover);
}

.kb-breadcrumb { color: var(--kb-muted); font-size: 0.9rem; margin-bottom: 1rem; }
.kb-breadcrumb a { text-decoration: none; }

.kb-article, .kb-category-header, .kb-article-list {
  background: var(--kb-surface);
  border: 1px solid var(--kb-border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
}

.kb-article h1 { margin-top: 0; font-size: 1.75rem; line-height: 1.35; }
.kb-article h2 {
  margin-top: 1.75rem;
  margin-bottom: 0.65rem;
  font-size: 1.25rem;
  line-height: 1.4;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--kb-border);
}
.kb-article h3 {
  margin-top: 1.25rem;
  margin-bottom: 0.45rem;
  font-size: 1.05rem;
}
.kb-article p {
  margin: 0.75rem 0;
}
.kb-article ul,
.kb-article ol {
  margin: 0.75rem 0;
  padding-left: 1.35rem;
}
.kb-article li {
  margin: 0.35rem 0;
}
.kb-article li > p {
  margin: 0.2rem 0;
}
.kb-article strong {
  color: #f1f5f9;
  font-weight: 650;
}
.kb-article hr {
  border: 0;
  border-top: 1px solid var(--kb-border);
  margin: 1.5rem 0;
}
.kb-article a {
  color: var(--kb-accent);
  text-decoration: underline;
  text-decoration-color: rgba(142, 182, 232, 0.4);
}
.kb-article a:hover {
  color: var(--kb-accent-hover);
}
.kb-article blockquote {
  margin: 1rem 0;
  padding: 0.85rem 1.05rem;
  border-left: 3px solid var(--kb-accent);
  background: var(--kb-accent-soft);
  color: var(--kb-muted);
  border-radius: 0 8px 8px 0;
}
.kb-article blockquote p {
  margin: 0.35rem 0;
}
.kb-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}
.kb-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 1rem 0;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--kb-border);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.15);
}
.kb-table-wrap table {
  margin: 0;
  min-width: 28rem;
}
.kb-article th,
.kb-article td {
  border: 1px solid var(--kb-border);
  padding: 0.55rem 0.7rem;
  text-align: left;
  vertical-align: top;
}
.kb-article th {
  background: var(--kb-accent-soft);
  font-weight: 600;
  white-space: nowrap;
}
.kb-article tbody tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.02);
}

.kb-pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 1rem; }
.kb-pager a { text-decoration: none; }

.kb-article-list ul { list-style: none; padding: 0; margin: 0; }
.kb-article-list li { padding: 0.75rem 0; border-bottom: 1px solid var(--kb-border); }
.kb-article-list li:last-child { border-bottom: 0; }
.kb-article-list a {
  color: var(--kb-text);
  text-decoration: none;
  font-weight: 600;
}
.kb-article-list a:hover { color: var(--kb-accent-hover); }
.kb-article-list p { margin: 0.35rem 0 0; color: var(--kb-muted); font-size: 0.95rem; }

@media (max-width: 800px) {
  .kb-shell { grid-template-columns: 1fr; }
  .kb-sidebar {
    position: static;
    max-height: none;
    overflow: visible;
  }
}