:root {
  --bg: #f6f8fb;
  --bg-soft: #eef2f7;
  --panel: #ffffff;
  --panel-2: #f8fafc;
  --border: #d9e1ec;
  --border-soft: #e6edf5;
  --text: #1f2937;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.09);
  --green: #059669;
  --warn: #b45309;
  --danger: #dc2626;
  --radius: 10px;
  --sidebar-w: 280px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 6px 20px rgba(15, 23, 42, 0.07);
  --font-sans: "Noto Sans SC", "Lato", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

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

body {
  background: radial-gradient(1200px 520px at 12% -10%, #e8f0fe 0%, var(--bg) 58%) fixed, var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: #1d4ed8; text-decoration: none; }
a:hover { color: #1e40af; }

img { max-width: 100%; }

/* ------------------------------- 布局 ------------------------------- */

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--sidebar-w);
  background: #ffffff;
  display: flex;
  flex-direction: column;
  z-index: 40;
}

.brand { padding: 16px 16px 8px; display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.brand-link { display: flex; gap: 10px; align-items: center; color: var(--text); }
.brand-logo { width: 32px; height: 32px; object-fit: contain; border: 0; background: none; padding: 0; border-radius: 0; }
.brand-text { display: flex; flex-direction: column; line-height: 1.3; }
.brand-text strong { font-size: 15px; letter-spacing: 0.2px; color: #0f172a; }

.topbar-search {
  position: relative;
  width: 100%;
  max-width: 420px;
  justify-self: center;
  display: flex;
  align-items: center;
}
.topbar-search > i {
  position: absolute;
  left: 11px;
  font-size: 12px;
  color: #94a3b8;
  pointer-events: none;
}
.search-input {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 12px 7px 30px;
  font-size: 13px;
  outline: none;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
.search-input::placeholder { color: #94a3b8; }
.search-input:focus { background: #fff; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

.nav { flex: 1; overflow-y: auto; padding: 4px 10px 18px; }
.nav-list { list-style: none; margin: 0; padding: 0; }
.nav-list.level-1, .nav-list.level-2, .nav-list.level-3 { margin-left: 8px; padding-left: 6px; }
.nav-item { margin: 1px 0; }
.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #475569;
  padding: 6px 10px;
  border-radius: 7px;
  font-size: 13.5px;
  line-height: 1.5;
}
.nav-link:hover { background: #f5f8fc; color: #0f172a; }
.nav-link.active { background: var(--accent-soft); color: #1d4ed8; }
.nav-title { flex: 1; overflow: hidden; text-overflow: ellipsis; }
.nav-empty { color: var(--muted); font-size: 13px; padding: 8px 12px; }
.lock { font-size: 10px; color: #94a3b8; }

.sidebar-footer {
  padding: 10px 16px 14px;
  font-size: 13px;
}
.who { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.who-name { font-weight: 600; color: #0f172a; }
.who-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; color: var(--muted); }
.who-actions a { color: var(--muted); }
.who-actions a:hover { color: var(--accent); }
.main-site-link {
  display: flex;
  align-items: center;
  gap: 7px;
  margin-top: 8px;
  color: var(--muted);
  font-size: 12.5px;
}
.main-site-link i { font-size: 11px; color: var(--accent); }
.main-site-link:hover { color: var(--accent); }

.main {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  background: #ffffff;
  display: flex;
  flex-direction: column;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 420px) minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 10px 26px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-soft);
}
.crumbs { flex: 1; display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); overflow: hidden; white-space: nowrap; }
.crumb-sep { color: #cbd5e1; }
.crumb.current { color: var(--text); }
.topbar-actions { display: flex; gap: 8px; align-items: center; justify-self: end; }

.content {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px 26px 64px;
}

.icon-btn.menu-btn { display: none; }
.icon-btn.sidebar-close { display: none; }
.sidebar-backdrop { display: none; }

/* ------------------------------- 文档 ------------------------------- */

.doc-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 200px;
  gap: 40px;
  align-items: start;
}
.doc { max-width: 860px; }
.doc-header h1 { font-size: 30px; line-height: 1.35; margin: 6px 0 8px; letter-spacing: .3px; color: #0f172a; }
.doc-meta { display: flex; gap: 12px; align-items: center; color: var(--muted); font-size: 12.5px; margin-bottom: 22px; }

.toc {
  position: sticky;
  top: 76px;
  font-size: 12.5px;
  border-left: 1px solid var(--border-soft);
  padding-left: 16px;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}
.toc-title { color: var(--muted); margin: 0 0 8px; letter-spacing: .08em; font-size: 11px; text-transform: uppercase; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 4px 0; }
.toc a { color: var(--muted); }
.toc a:hover { color: var(--accent); }
.toc-l3 { padding-left: 12px; }

/* Markdown 正文 */
.markdown-body { font-size: 15.5px; line-height: 1.85; color: #334155; }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  color: #0f172a;
  line-height: 1.4;
  margin: 1.8em 0 .7em;
  scroll-margin-top: 80px;
}
.markdown-body h1 { font-size: 26px; }
.markdown-body h2 { font-size: 21px; padding-bottom: .35em; border-bottom: 1px solid var(--border-soft); }
.markdown-body h3 { font-size: 17.5px; }
.markdown-body h4 { font-size: 15.5px; color: #334155; }
.markdown-body p { margin: .85em 0; }
.markdown-body ul, .markdown-body ol { padding-left: 1.5em; }
.markdown-body li { margin: .3em 0; }
.markdown-body blockquote {
  margin: 1em 0;
  padding: .6em 1em;
  border-left: 3px solid var(--accent);
  background: rgba(37, 99, 235, .05);
  border-radius: 0 8px 8px 0;
  color: #475569;
}
.markdown-body code {
  font-family: var(--font-mono);
  font-size: .88em;
  background: #f1f5f9;
  border: 1px solid var(--border-soft);
  padding: .12em .4em;
  border-radius: 5px;
  color: #b91c1c;
}
.markdown-body pre {
  background: #f8fafc;
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
  line-height: 1.6;
  margin: 1.1em 0;
}
.markdown-body pre code { background: none; border: 0; padding: 0; color: #1e293b; font-size: 13px; }
.markdown-body table { border-collapse: collapse; width: 100%; font-size: 14px; }
.markdown-body th, .markdown-body td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.markdown-body th { background: #f1f5f9; color: #0f172a; }
.table-wrap { overflow-x: auto; margin: 1.1em 0; border-radius: 8px; }
.markdown-body hr { border: 0; border-top: 1px solid var(--border-soft); margin: 2em 0; }
.markdown-body img { border-radius: 8px; }
.math-block { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }
.katex { font-size: 1.02em; }
.math-error { color: var(--danger); }
.empty { color: var(--muted); }

/* ------------------------------- 编辑器 ------------------------------- */

.editor-topbar { display: flex; align-items: center; gap: 12px; }
.editor-topbar .crumbs { flex: 1; font-size: 13px; }
.editor-content { max-width: 1500px; padding-top: 16px; }
.editor-form { display: flex; flex-direction: column; gap: 12px; }
.editor-meta { display: flex; flex-wrap: wrap; gap: 12px; }
.editor-tabs { display: flex; align-items: center; gap: 6px; }
.tab {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 5px 12px;
  border-radius: 7px;
  cursor: pointer;
  font-size: 13px;
}
.tab:hover { color: var(--text); border-color: #c3cfdf; }
.tab.active { background: var(--accent-soft); color: #1d4ed8; border-color: rgba(37, 99, 235, .4); font-weight: 600; }
.editor-hint { margin-left: auto; color: #94a3b8; font-size: 12px; }
.editor-panes { display: grid; gap: 14px; min-height: calc(100vh - 240px); }
.editor-panes.mode-split { grid-template-columns: 1fr 1fr; }
.editor-panes.mode-write { grid-template-columns: 1fr; }
.editor-panes.mode-write .pane-preview { display: none; }
.editor-panes.mode-preview { grid-template-columns: 1fr; }
.editor-panes.mode-preview .pane-write { display: none; }
.pane { display: flex; min-width: 0; }
.code-area {
  width: 100%;
  min-height: calc(100vh - 240px);
  resize: vertical;
  background: #ffffff;
  color: #1e293b;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.75;
  outline: none;
  tab-size: 2;
  box-shadow: var(--shadow-sm);
}
.code-area:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.pane-preview {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  background: #ffffff;
  padding: 18px 22px;
  overflow-y: auto;
  max-height: calc(100vh - 200px);
  box-shadow: var(--shadow-sm);
}

/* ------------------------------- 表单与按钮 ------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 13.5px;
  cursor: pointer;
  background: #f1f5f9;
  color: #334155;
  line-height: 1.4;
  transition: background .15s, border-color .15s, transform .05s, color .15s;
}
.btn:hover { background: #e6edf6; color: #0f172a; }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); box-shadow: 0 1px 2px rgba(37, 99, 235, .25); }
.btn.primary:hover { background: #1d4ed8; color: #fff; }
.btn.ghost { background: #fff; border-color: var(--border); color: #334155; }
.btn.ghost:hover { border-color: #b9c7da; background: #f8fafc; color: #0f172a; }
.btn.danger { background: #fff; border-color: rgba(220, 38, 38, .35); color: #dc2626; }
.btn.danger:hover { background: #fef2f2; color: #b91c1c; }
.btn.sm { padding: 4px 10px; font-size: 12.5px; }
.btn.block { width: 100%; justify-content: center; }

.icon-btn {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.icon-btn:hover { color: var(--accent); border-color: #b9c7da; }

.link-btn { background: none; border: 0; color: var(--muted); cursor: pointer; padding: 0; font-size: 13px; }
.link-btn:hover { color: var(--accent); }
.inline { display: inline; }
.inline-form { display: inline-flex; gap: 6px; align-items: center; }

.form { display: flex; flex-direction: column; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field > span { color: var(--muted); font-size: 12.5px; }
.field.grow { flex: 1 1 320px; }
.field.narrow { width: 96px; }
.grid-form { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; align-items: end; }
.submit-field { justify-content: flex-end; }

.input, .select {
  width: 100%;
  background: #ffffff;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 14px;
  outline: none;
  font-family: inherit;
}
.input:focus, .select:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.input.sm, .select.sm { padding: 4px 8px; font-size: 12.5px; width: auto; }

.alert { border-radius: 8px; padding: 10px 14px; font-size: 13.5px; }
.alert.error { background: #fef2f2; border: 1px solid #fecaca; color: #b91c1c; }
.alert.ok { background: #ecfdf5; border: 1px solid #a7f3d0; color: #047857; }

/* ------------------------------- 列表与卡片 ------------------------------- */

.page-title { font-size: 24px; margin: 6px 0 18px; color: #0f172a; }
.card {
  background: var(--panel);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 20px 22px;
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
}
.card h2 { font-size: 15.5px; margin: 0 0 14px; color: #0f172a; }
.muted-card { background: var(--panel-2); box-shadow: none; }
.plain-list { margin: 0; padding-left: 1.2em; color: #475569; font-size: 14px; }
.plain-list li { margin: .35em 0; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border-soft); border-radius: 12px; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 13.5px; background: var(--panel); }
.admin-table th, .admin-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border-soft); vertical-align: middle; }
.admin-table th { color: var(--muted); font-weight: 500; font-size: 12.5px; letter-spacing: .03em; background: #f8fafc; }
.admin-table tr:last-child td { border-bottom: 0; }
.admin-table tbody tr:hover { background: #fbfdff; }
.row-actions { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }

.badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 11.5px;
  border: 1px solid var(--border);
  color: var(--muted);
  line-height: 1.6;
}
.badge.role-admin { color: #b45309; border-color: rgba(180, 83, 9, .28); background: rgba(245, 158, 11, .1); }
.badge.role-editor { color: #1d4ed8; border-color: rgba(37, 99, 235, .25); background: rgba(37, 99, 235, .07); }
.badge.role-viewer { color: #64748b; }
.badge.vis { color: #b45309; border-color: rgba(180, 83, 9, .28); background: rgba(245, 158, 11, .1); }

.muted { color: var(--muted); }
.small { font-size: 12px; }
.mono { font-family: var(--font-mono); }

/* ------------------------------- 搜索 ------------------------------- */

.search-results { list-style: none; padding: 0; margin: 18px 0; }
.search-result {
  border: 1px solid var(--border-soft);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 12px;
  background: var(--panel);
  box-shadow: var(--shadow-sm);
}
.result-title { font-size: 16px; font-weight: 600; }
.result-snippet { margin: 6px 0 0; color: var(--muted); font-size: 13.5px; }

/* ------------------------------- 登录 ------------------------------- */

.login-body { display: block; }
.login-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--panel);
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  padding: 30px 28px;
  box-shadow: 0 18px 50px rgba(15, 23, 42, .1);
}
.login-brand { display: inline-flex; align-items: center; gap: 8px; color: #0f172a; font-size: 13.5px; margin-bottom: 18px; }
.login-brand img { width: 26px; height: 26px; border-radius: 6px; }
.login-card h1 { font-size: 22px; margin: 0 0 4px; color: #0f172a; }
.login-sub { color: var(--muted); font-size: 13px; margin: 0 0 18px; }
.back-link { display: inline-block; margin: 16px 14px 0 0; font-size: 13px; color: var(--muted); }
.back-link:hover { color: var(--accent); }

/* ------------------------------- 错误页 ------------------------------- */

.error-page { padding: 8vh 0; text-align: center; }
.error-code { font-size: 64px; font-weight: 800; color: #dbe3ee; margin: 0; }
.error-page h1 { font-size: 20px; color: #475569; margin: 6px 0 22px; font-weight: 500; }

/* ------------------------------- 响应式 ------------------------------- */

@media (max-width: 1080px) {
  .doc-layout { grid-template-columns: minmax(0, 1fr); }
  .toc { display: none; }
}

@media (max-width: 860px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform .22s ease;
    box-shadow: 0 0 40px rgba(15, 23, 42, .18);
    width: 84vw;
    max-width: 320px;
  }
  body.nav-open .sidebar { transform: translateX(0); }
  body.nav-open .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, .35);
    z-index: 35;
  }
  .main { margin-left: 0; }
  .icon-btn.menu-btn { display: inline-flex; }
  .icon-btn.sidebar-close { display: inline-flex; }
  .content { padding: 18px 16px 56px; }
  .topbar { padding: 8px 14px; grid-template-columns: auto minmax(0, 1fr) auto; }
  .topbar-search { max-width: none; }
  .doc-header h1 { font-size: 24px; }
  .editor-panes.mode-split { grid-template-columns: 1fr; }
  .editor-panes.mode-split .pane-preview { max-height: 60vh; }
  .editor-hint { display: none; }
}