/* VexlonAI 官方文档 - 前台样式 */
:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-soft: #eff6ff;
  --text: #1f2937;
  --text-soft: #6b7280;
  --text-faint: #9ca3af;
  --border: #e5e7eb;
  --bg: #ffffff;
  --bg-soft: #f9fafb;
  --code-bg: #f3f4f6;
  --radius: 12px;
  --sidebar-w: 268px;
  --topbar-h: 60px;
  --footer-h: 96px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

/* ---------------- 顶栏 ---------------- */
.topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 60;
}

.menu-toggle {
  display: none;
  border: none;
  background: transparent;
  font-size: 20px;
  line-height: 1;
  color: var(--text-soft);
  padding: 6px 8px;
  border-radius: 8px;
  cursor: pointer;
}
.menu-toggle:hover { background: var(--bg-soft); }

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--text);
  font-size: 16px;
}
.brand:hover { color: var(--text); }
.brand-logo {
  width: 32px; height: 32px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), #60a5fa);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.5px;
  flex: 0 0 auto;
}

.topbar-spacer { flex: 1; }

.topbar-link {
  font-size: 14px;
  color: var(--text-soft);
  padding: 6px 12px;
  border-radius: 8px;
}
.topbar-link:hover { background: var(--bg-soft); color: var(--text); }

/* ---------------- 布局 ---------------- */
.layout {
  display: flex;
  align-items: flex-start;
  padding-top: var(--topbar-h);
  min-height: calc(100vh - var(--topbar-h) - var(--footer-h));
}

.overlay {
  display: none;
  position: fixed;
  inset: var(--topbar-h) 0 0 0;
  background: rgba(17, 24, 39, 0.4);
  z-index: 40;
}

/* ---------------- 侧栏 ---------------- */
.sidebar {
  position: fixed;
  top: var(--topbar-h);
  bottom: 0;
  left: 0;
  width: var(--sidebar-w);
  overflow-y: auto;
  padding: 20px 14px 32px;
  border-right: 1px solid var(--border);
  background: var(--bg);
  z-index: 45;
}

.sidebar-search {
  position: relative;
  margin-bottom: 16px;
}
.sidebar-search input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 9px;
  font-size: 13px;
  color: var(--text);
  background: var(--bg-soft);
  outline: none;
}
.sidebar-search input:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
}

.nav-home {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: 9px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.nav-home .cat-icon { font-size: 15px; width: 20px; text-align: center; }
.nav-home:hover { background: var(--bg-soft); color: var(--text); }
.nav-home.active { background: var(--primary-soft); color: var(--primary); }

.nav-cat {
  margin-bottom: 6px;
}
.nav-cat > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: 9px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  user-select: none;
}
.nav-cat > summary::-webkit-details-marker { display: none; }
.nav-cat > summary:hover { background: var(--bg-soft); }
.nav-cat .cat-icon { font-size: 15px; width: 20px; text-align: center; }
.nav-cat .cat-arrow {
  margin-left: auto;
  color: var(--text-faint);
  font-size: 11px;
  transition: transform 0.18s ease;
}
.nav-cat[open] .cat-arrow { transform: rotate(90deg); }

.nav-docs { padding: 2px 0 6px 12px; margin: 0; list-style: none; }
.nav-docs li { margin: 1px 0; }
.nav-docs a {
  display: block;
  padding: 7px 12px;
  border-left: 2px solid var(--border);
  font-size: 13.5px;
  color: var(--text-soft);
  line-height: 1.5;
}
.nav-docs a:hover {
  color: var(--primary);
  border-left-color: #bfdbfe;
  background: var(--bg-soft);
}
.nav-docs a.active {
  color: var(--primary);
  border-left-color: var(--primary);
  background: var(--primary-soft);
  font-weight: 600;
}

.nav-empty {
  font-size: 13px;
  color: var(--text-faint);
  padding: 8px 10px;
}

/* ---------------- 内容区 ---------------- */
.content {
  flex: 1;
  min-width: 0;
  margin-left: var(--sidebar-w);
  padding: 34px 40px 60px;
  max-width: 900px;
}

/* 首页 */
.hero {
  padding: 26px 30px 30px;
  border-radius: 18px;
  background: linear-gradient(135deg, #eff6ff 0%, #f8fafc 60%, #ffffff 100%);
  border: 1px solid #e0eaff;
  margin-bottom: 30px;
}
.hero h1 {
  margin: 0 0 12px;
  font-size: 34px;
  line-height: 1.25;
  letter-spacing: -0.5px;
}
.hero p {
  margin: 0 0 20px;
  font-size: 16px;
  color: var(--text-soft);
  max-width: 640px;
}
.hero-btn {
  display: inline-block;
  padding: 11px 24px;
  border-radius: 10px;
  background: var(--primary);
  color: #fff;
  font-size: 14.5px;
  font-weight: 600;
  transition: background 0.18s ease, transform 0.18s ease;
}
.hero-btn:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); }

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 14px;
  margin-bottom: 34px;
}
.card {
  display: block;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: inherit;
  background: #fff;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}
.card:hover {
  border-color: #bfdbfe;
  box-shadow: 0 8px 22px -12px rgba(59, 130, 246, 0.5);
  transform: translateY(-2px);
  color: inherit;
}
.card-icon { font-size: 22px; }
.card-title { font-weight: 700; font-size: 15px; margin: 8px 0 4px; }
.card-desc { font-size: 13px; color: var(--text-soft); line-height: 1.6; }

/* 文档 */
.breadcrumb {
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 12px;
}
.breadcrumb a { color: var(--text-soft); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

.article-title {
  margin: 0 0 8px;
  font-size: 30px;
  line-height: 1.3;
  letter-spacing: -0.4px;
}
.article-meta {
  font-size: 12.5px;
  color: var(--text-faint);
  border-bottom: 1px solid var(--border);
  padding-bottom: 18px;
  margin-bottom: 26px;
}

/* Markdown 正文 */
.md-body { font-size: 15.5px; color: #374151; }
.md-body h1, .md-body h2, .md-body h3, .md-body h4 {
  color: var(--text);
  line-height: 1.35;
  margin: 34px 0 14px;
  scroll-margin-top: calc(var(--topbar-h) + 16px);
}
.md-body h1 { font-size: 27px; }
.md-body h2 {
  font-size: 22px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.md-body h3 { font-size: 18px; }
.md-body h4 { font-size: 16px; }
.md-body p { margin: 0 0 16px; }
.md-body ul, .md-body ol { margin: 0 0 16px; padding-left: 24px; }
.md-body li { margin: 5px 0; }
.md-body blockquote {
  margin: 0 0 16px;
  padding: 12px 18px;
  border-left: 3px solid var(--primary);
  background: var(--primary-soft);
  border-radius: 0 8px 8px 0;
  color: #374151;
}
.md-body blockquote p:last-child { margin-bottom: 0; }
.md-body hr { border: none; border-top: 1px solid var(--border); margin: 30px 0; }
.md-body code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 0.9em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  color: #be185d;
}
.md-body .md-pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 16px 18px;
  border-radius: 10px;
  overflow-x: auto;
  margin: 0 0 18px;
  font-size: 13.5px;
  line-height: 1.6;
}
.md-body .md-pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}
.md-body img { max-width: 100%; border-radius: 8px; }
.md-body .md-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 18px;
  font-size: 14px;
  display: block;
  overflow-x: auto;
}
.md-body .md-table th, .md-body .md-table td {
  border: 1px solid var(--border);
  padding: 9px 12px;
  text-align: left;
}
.md-body .md-table th { background: var(--bg-soft); font-weight: 600; }

/* 上一篇 / 下一篇 */
.pager {
  display: flex;
  gap: 12px;
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.pager a {
  flex: 1;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: inherit;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.pager a:hover { border-color: #bfdbfe; box-shadow: 0 6px 18px -12px rgba(59,130,246,.6); color: inherit; }
.pager .pager-label { font-size: 12px; color: var(--text-faint); display: block; margin-bottom: 3px; }
.pager .pager-title { font-size: 14px; font-weight: 600; color: var(--text); }
.pager .next { text-align: right; }

/* 右侧目录 */
.toc {
  display: none;
  position: fixed;
  top: var(--topbar-h);
  right: 0;
  width: 236px;
  max-height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  padding: 34px 22px 40px;
  font-size: 13px;
}
.toc-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.6px;
  margin-bottom: 10px;
}
.toc ul { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
.toc li a {
  display: block;
  padding: 5px 12px;
  color: var(--text-soft);
  border-left: 2px solid transparent;
  margin-left: -1px;
}
.toc li.lv3 a { padding-left: 26px; font-size: 12.5px; }
.toc li a:hover { color: var(--primary); }
.toc li a.active { color: var(--primary); border-left-color: var(--primary); font-weight: 600; }

/* ---------------- 页脚 ---------------- */
.site-footer {
  text-align: center;
  padding: 22px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
}
.site-footer p { font-size: 12px; color: var(--text-faint); margin: 0 0 6px; }
.site-footer p:last-child { margin-bottom: 0; }
.site-footer a { color: var(--text-faint); font-size: 12px; transition: color 0.2s; }
.site-footer a:hover { color: #6b7280; }
.site-footer .sep { margin: 0 8px; opacity: 0.5; }

.site-notfound { padding: 60px 0; text-align: center; color: var(--text-soft); }

/* ---------------- 竖屏 / 横屏 / 移动端适配 ---------------- */
@media (min-width: 1181px) {
  /* 仅在存在本页目录的文档页显示右侧目录，并为其预留空间，避免与正文重叠 */
  body.has-toc .toc { display: block; }
  body.has-toc .content { margin-right: 236px; }
}

@media (max-width: 1180px) {
  .content { max-width: none; padding: 30px 32px 56px; }
}

/*
 * 方向决定版式：
 *   竖屏窄屏 -> 竖屏版（侧栏抽屉式收起，靠 ☰ 打开）
 *   横屏     -> 横屏版（侧栏常驻，与桌面版一致）
 * 仅当「横屏且极窄」（< 561px，极少见）时才回落到抽屉，避免正文被挤没。
 */
@media (max-width: 980px) and (orientation: portrait),
       (orientation: landscape) and (max-width: 560px) {
  .menu-toggle { display: inline-flex; }
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.24s ease;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.12);
    width: min(84vw, var(--sidebar-w));
  }
  body.sidebar-open .sidebar { transform: translateX(0); }
  body.sidebar-open .overlay { display: block; }
  .content { margin-left: 0; padding: 24px 20px 48px; }
  .toc { display: none; }
}

/* 横屏版：手机 / 小平板横屏时侧栏常驻，收窄侧栏与留白以给正文让出宽度 */
@media (orientation: landscape) and (min-width: 561px) and (max-width: 980px) {
  :root { --sidebar-w: 220px; }
  .content { padding: 24px 24px 44px; }
}

@media (max-width: 600px) {
  .topbar { padding: 0 12px; gap: 8px; }
  .topbar-link { padding: 6px 8px; font-size: 13px; }
  .content { padding: 18px 14px 40px; }
  .hero { padding: 20px 18px 22px; border-radius: 14px; }
  .hero h1 { font-size: 25px; }
  .hero p { font-size: 14.5px; }
  .hero-btn { display: block; text-align: center; }
  .cards { grid-template-columns: 1fr; gap: 10px; }
  .article-title { font-size: 23px; }
  .md-body { font-size: 15px; }
  .md-body h2 { font-size: 19px; }
  .md-body h3 { font-size: 16.5px; }
  .pager { flex-direction: column; }
  .pager .next { text-align: left; }
}