/* ===== Reset & base ===== */
*,*::before,*::after{box-sizing:border-box}
:root{
  /* surfaces */
  --bg:#f6f7fb; --card:#fff;
  --surface:#fff;            /* inputs, buttons, chips base */
  --surface-soft:#fafbfd;    /* subtle bg: panel-tabs, ai-presets, ai-input */
  --surface-muted:#f1f3f9;   /* counters, inline code, hover bg */
  --surface-tint:#f8fafc;    /* summary boxes, table th */
  --surface-nested:#fafafa;  /* blockquote, zebra rows */
  /* text */
  --ink:#1f2330; --ink-strong:#18181b; --ink-md:#374151;
  --ink-soft:#52525b; --ink-faint:#3f3f46; --ink-dim:#71717a;
  --muted:#6b7280; --line:#e6e8ef;
  /* brand */
  --brand:#4f46e5; --brand-d:#4338ca; --brand-bg:#eef2ff; --accent:#06b6d4;
  /* code blocks (dark in both themes) */
  --code-bg:#0f172a; --code-ink:#e2e8f0;
  /* status boxes */
  --warn-bg:#fffbeb; --warn-border:#fde68a; --warn-ink:#92400e;
  --err-bg:#fef2f2; --err-border:#fecaca; --err-ink:#991b1b;
  --on-brand:#fff;
  --ok:#10b981; --warn:#f59e0b; --err:#ef4444;
  --radius:14px; --shadow:0 1px 3px rgba(16,24,40,.06),0 1px 2px rgba(16,24,40,.04);
  --topbar-h:60px; --side-w:268px; --ai-w:380px;
  color-scheme:light;
}
[data-theme="dark"]{
  --bg:#0e1016; --card:#171a21;
  --surface:#1c2029; --surface-soft:#14171e; --surface-muted:#262b36;
  --surface-tint:#1a1e26; --surface-nested:#16191f;
  --ink:#e6e8ee; --ink-strong:#f4f5f8; --ink-md:#cbd5e1;
  --ink-soft:#9aa3b2; --ink-faint:#c4c9d3; --ink-dim:#8b94a3;
  --muted:#8b94a3; --line:#2a2f3a;
  --brand:#6366f1; --brand-d:#4f46e5; --brand-bg:rgba(99,102,241,.18); --accent:#22d3ee;
  --code-bg:#0a0d14; --code-ink:#e2e8f0;
  --warn-bg:rgba(245,158,11,.12); --warn-border:rgba(245,158,11,.4); --warn-ink:#fbbf24;
  --err-bg:rgba(239,68,68,.12); --err-border:rgba(239,68,68,.4); --err-ink:#fca5a5;
  --shadow:0 1px 3px rgba(0,0,0,.3),0 1px 2px rgba(0,0,0,.2);
  color-scheme:dark;
}
html{ -webkit-text-size-adjust:100%; }
body{
  margin:0; background:var(--bg); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px; line-height:1.6;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{margin:0 0 .4em;line-height:1.3}
img{max-width:100%;height:auto}

/* ===== Topbar ===== */
.topbar{position:sticky;top:0;z-index:50;background:var(--card);border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
.topbar-inner{max-width:1400px;margin:0 auto;padding:0 16px;height:var(--topbar-h);display:flex;align-items:center;gap:14px}
.brand{font-weight:800;font-size:1.15rem;color:var(--ink);white-space:nowrap}
.brand:hover{text-decoration:none;color:var(--brand-d)}
.search-form{display:flex;align-items:center;gap:6px;flex:1;max-width:520px}
.search-form input[type=search]{flex:1;min-width:0;height:38px;border:1px solid var(--line);border-radius:10px;padding:0 12px;font-size:.95rem;background:var(--surface);color:var(--ink)}
.search-form input[type=search]:focus{outline:2px solid var(--brand-bg);border-color:var(--brand)}
.fts-check{display:inline-flex;align-items:center;gap:4px;font-size:.82rem;color:var(--muted);white-space:nowrap;cursor:pointer}
.fts-check input{margin:0}
.btn-search{height:38px;padding:0 14px;border:0;border-radius:10px;background:var(--brand);color:var(--on-brand);font-weight:600;cursor:pointer}
.btn-search:hover{background:var(--brand-d)}
.nav-links{display:flex;gap:4px}
.nav-links a{padding:8px 12px;border-radius:8px;color:var(--muted);font-weight:600;font-size:.95rem}
.nav-links a:hover{background:var(--brand-bg);color:var(--brand);text-decoration:none}
.nav-links a.is-active{color:var(--brand);background:var(--brand-bg)}
.sidebar-toggle{display:none;width:40px;height:40px;border:1px solid var(--line);background:var(--surface);border-radius:10px;font-size:1.2rem;cursor:pointer;line-height:1;color:var(--ink)}

/* ===== Layout ===== */
.content{max-width:1400px;margin:0 auto;padding:20px 16px 48px}
.layout{display:grid;grid-template-columns:var(--side-w) minmax(0,1fr);gap:22px;align-items:start}
/* AI open: app-like full-viewport shell */
body.ai-active .content{max-width:none;margin:0;padding:12px;height:calc(100vh - var(--topbar-h));overflow:hidden}
body.ai-active .footer{display:none}
.layout.ai-open{
  display:flex;align-items:stretch;height:100%;gap:0;
  --art-flex:58; --ai-flex:42;
}
.layout.ai-open .sidebar{display:none}
.layout.ai-open .main{
  flex:var(--art-flex) 1 0;min-width:320px;overflow:auto;position:relative;
  scrollbar-width:none;
}
.layout.ai-open .main::-webkit-scrollbar{display:none;width:0;height:0}
.layout.ai-open .reader{max-width:none;margin:0;padding:18px 16px}
.layout.ai-open .markdown{font-size:.97rem}
.splitter{display:none}
.layout.ai-open .splitter{
  display:block;flex:0 0 7px;align-self:stretch;cursor:col-resize;
  background:transparent;position:relative;z-index:5;
}
.layout.ai-open .splitter::before{
  content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:3px;height:36px;border-radius:3px;background:var(--line);transition:background .15s;
}
.layout.ai-open .splitter:hover::before,.layout.ai-open .splitter.dragging::before{background:var(--brand)}
.layout.ai-open .ai-panel{
  position:relative;top:auto;flex:var(--ai-flex) 1 0;min-width:300px;height:auto;border-radius:0;
}
.sidebar{
  position:sticky;top:calc(var(--topbar-h) + 20px);max-height:calc(100vh - var(--topbar-h) - 40px);
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)
}
.sidebar > .tree{flex:1 1 auto;overflow:auto;padding:10px;min-height:0}
.sidebar-backdrop{display:none}

/* ===== Language toggle (original / Chinese) ===== */
.lang-bar{display:flex;gap:4px;flex:0 0 auto;padding:6px 8px;border-bottom:1px solid var(--line);background:var(--surface-soft)}
.lang-btn{flex:1;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:5px 8px;font-size:.78rem;font-weight:600;color:var(--muted);cursor:pointer;transition:background .15s,color .15s,border-color .15s}
.lang-btn:hover{color:var(--brand);border-color:var(--brand)}
.lang-btn.is-active{background:var(--brand);color:var(--on-brand);border-color:var(--brand)}

 /* ===== Panel tabs (directory / outline) ===== */
.panel-tabs{flex:0 0 auto;display:flex;gap:2px;padding:8px 8px 0;border-bottom:1px solid var(--line);background:var(--surface-soft)}
.panel-tab{flex:1;border:0;background:transparent;padding:8px 6px;font-size:.85rem;font-weight:600;color:var(--muted);cursor:pointer;border-radius:8px 8px 0 0;border-bottom:2px solid transparent}
.panel-tab:hover{color:var(--brand)}
.panel-tab.is-active{color:var(--brand);border-bottom-color:var(--brand);background:var(--surface)}
.panel-body{flex:1 1 auto;overflow:auto;padding:10px;min-height:0}
.pane[hidden]{display:none}

/* outline */
.outline{display:flex;flex-direction:column;gap:1px}
.outline-empty{color:var(--muted);font-size:.85rem;padding:14px 6px}
.outline-link{display:block;padding:6px 8px;border-radius:6px;color:var(--ink-faint);font-size:.85rem;line-height:1.4;border-left:2px solid transparent;cursor:pointer}
.outline-link:hover{background:var(--brand-bg);color:var(--brand);text-decoration:none}
.outline-link.lvl-2{padding-left:18px;font-size:.82rem;color:var(--ink-soft)}
.outline-link.lvl-3{padding-left:30px;font-size:.8rem;color:var(--ink-dim)}
.outline-link.is-active{background:var(--brand-bg);color:var(--brand);border-left-color:var(--brand);font-weight:600}

/* ===== Theme toggle ===== */
.theme-toggle{flex:0 0 auto;width:38px;height:38px;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:10px;font-size:1.05rem;line-height:1;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:background .15s,border-color .15s,color .15s}
.theme-toggle:hover{border-color:var(--brand);color:var(--brand)}
.theme-toggle .ico{display:none}
[data-theme="light"] .theme-toggle .ico-light{display:inline}
[data-theme="dark"] .theme-toggle .ico-dark{display:inline}

/* ===== AI toggle button ===== */
.ai-toggle{height:36px;padding:0 14px;border-radius:9px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-weight:700;font-size:.85rem;cursor:pointer;white-space:nowrap}
.ai-toggle:hover{border-color:var(--brand);color:var(--brand)}
.ai-toggle.is-active{background:var(--brand);border-color:var(--brand);color:var(--on-brand)}

/* ===== AI panel ===== */
.ai-panel{
  position:sticky;top:calc(var(--topbar-h) + 20px);
  height:calc(100vh - var(--topbar-h) - 40px);
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)
}
.ai-panel[hidden]{display:none}
.ai-head{flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;padding:12px 14px;border-bottom:1px solid var(--line)}
.ai-title{font-weight:700;font-size:.92rem}
.ai-close{border:0;background:transparent;font-size:1rem;cursor:pointer;color:var(--muted);line-height:1;width:28px;height:28px;border-radius:6px}
.ai-close:hover{background:var(--surface-muted);color:var(--ink)}
.ai-presets{flex:0 0 auto;display:flex;flex-wrap:wrap;gap:6px;padding:10px 12px;border-bottom:1px solid var(--line);background:var(--surface-soft)}
.chip{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:4px 10px;font-size:.74rem;color:var(--brand);cursor:pointer;font-weight:600}
.chip:hover{background:var(--brand);color:var(--on-brand);border-color:var(--brand)}
.ai-messages{flex:1 1 auto;overflow:auto;padding:14px;display:flex;flex-direction:column;gap:12px;min-height:0;scrollbar-width:thin;scrollbar-color:var(--line) transparent}
.ai-messages::-webkit-scrollbar{width:6px}
.ai-messages::-webkit-scrollbar-thumb{background:var(--line);border-radius:3px}
.ai-messages::-webkit-scrollbar-track{background:transparent}
.ai-empty{margin:auto;color:var(--muted);font-size:.88rem;text-align:center;padding:24px}
.ai-empty code{background:var(--surface-muted);padding:1px 5px;border-radius:4px;font-size:.85em}
.ai-msg{max-width:92%;padding:9px 12px;border-radius:12px;font-size:.88rem;line-height:1.6;word-wrap:break-word;overflow-wrap:anywhere}
.ai-msg.user{align-self:flex-end;background:var(--brand);color:var(--on-brand);border-bottom-right-radius:4px}
.ai-msg.ai{align-self:flex-start;background:var(--surface-muted);color:var(--ink);border-bottom-left-radius:4px}
.ai-msg.ai .markdown{font-size:.88rem;margin:0}
.ai-msg.ai .markdown p:first-child{margin-top:0}
.ai-msg.ai .markdown p:last-child{margin-bottom:0}
.ai-msg.err{align-self:flex-start;background:var(--err-bg);color:var(--err-ink);border:1px solid var(--err-border)}
.ai-cursor{display:inline-block;width:6px;height:1em;background:var(--brand);vertical-align:text-bottom;animation:blink 1s steps(2) infinite;margin-left:2px}
@keyframes blink{50%{opacity:0}}
.ai-input{flex:0 0 auto;display:flex;gap:8px;padding:10px 12px;border-top:1px solid var(--line);background:var(--surface-soft)}
.ai-input textarea{flex:1;resize:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px;font-size:.85rem;font-family:inherit;max-height:120px;background:var(--surface);color:var(--ink)}
.ai-input textarea:focus{outline:2px solid var(--brand-bg);border-color:var(--brand)}
.ai-input button{flex:0 0 auto;border:0;background:var(--brand);color:var(--on-brand);font-weight:600;border-radius:8px;padding:0 16px;cursor:pointer}
.ai-input button:disabled{opacity:.5;cursor:not-allowed}

/* ===== Tree ===== */
.tree{display:flex;flex-direction:column;gap:1px}
.tree-link{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 10px;border-radius:8px;color:var(--ink);font-size:.92rem;cursor:pointer}
.tree-link:hover{background:var(--brand-bg);text-decoration:none}
.tree-link.is-active{background:var(--brand);color:var(--on-brand)}
.tree-link.is-active .tree-count{color:var(--on-brand);background:rgba(255,255,255,.25)}
.tree-name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis}
.tree-link.tree-root{font-weight:700}
.tree-count{font-size:.74rem;color:var(--muted);background:var(--surface-muted);border-radius:999px;padding:1px 8px;white-space:nowrap}
.tree-group{margin:0}
.tree-group > summary{list-style:none}
.tree-group > summary::-webkit-details-marker{display:none}
.tree-group > summary::before{content:"▸";display:inline-block;width:14px;color:var(--muted);transition:transform .15s;font-size:.8rem}
.tree-group[open] > summary::before{transform:rotate(90deg)}
.tree-sub{display:flex;flex-direction:column;gap:1px;padding-left:10px;margin:2px 0}
.tree-sub .tree-link{font-size:.86rem;padding:6px 10px}

/* ===== Main column ===== */
.main{min-width:0}
.main-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.main-title{font-size:1.35rem}
.head-right{display:inline-flex;align-items:center;gap:12px;flex-wrap:wrap}
.result-count{color:var(--muted);font-size:.9rem;white-space:nowrap}

/* view toggle (list / grid) */
.view-toggle{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--surface)}
.view-btn{border:0;background:transparent;padding:7px 9px;cursor:pointer;color:var(--muted);line-height:0;display:inline-flex;align-items:center;justify-content:center;transition:background .15s,color .15s}
.view-btn:hover{color:var(--brand);background:var(--brand-bg)}
.view-btn.is-active{background:var(--brand);color:var(--on-brand)}
.view-btn svg{width:16px;height:16px;display:block}

/* toolbar */
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:16px;padding:12px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.tb-input,.tb-select{height:34px;border:1px solid var(--line);border-radius:8px;padding:0 10px;font-size:.85rem;background:var(--surface);color:var(--ink)}
.tb-input:focus,.tb-select:focus{outline:2px solid var(--brand-bg);border-color:var(--brand)}
.btn-sm{height:34px;padding:0 12px;border-radius:8px;border:1px solid var(--line);background:var(--surface);cursor:pointer;font-size:.85rem;font-weight:600;color:var(--ink)}
.btn-sm:hover{background:var(--brand-bg);border-color:var(--brand)}
.btn-ghost{color:var(--muted)}

/* ===== Doc cards ===== */
.doc-list{display:flex;flex-direction:column;gap:12px}
.doc-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow);transition:border-color .15s,transform .1s}
.doc-card:hover{border-color:var(--brand)}
.doc-title{font-size:1.08rem;margin-bottom:6px}
.doc-title a{color:var(--ink)}
.doc-title a:hover{color:var(--brand)}
.doc-summary{color:var(--muted);font-size:.9rem;margin:0 0 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.doc-meta{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:.8rem;color:var(--muted);align-items:center}
.doc-meta a{color:var(--muted)}
.doc-meta a:hover{color:var(--brand)}
.meta-cat{color:var(--muted)}
.doc-tags{margin-top:8px;display:flex;flex-wrap:wrap;gap:6px}
.tag{display:inline-block;font-size:.74rem;color:var(--brand);background:var(--brand-bg);border-radius:999px;padding:2px 10px;line-height:1.6}
.tag:hover{background:var(--brand);color:var(--on-brand);text-decoration:none}
.tag-n{opacity:.6;margin-left:4px;font-size:.7rem}
.stars{color:#f59e0b;letter-spacing:1px}

/* ===== Grid (card) view ===== */
.doc-cover{display:none}
.doc-list[data-view="grid"]{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px;align-items:start}
.doc-list[data-view="grid"] > .empty{grid-column:1/-1}
.doc-list[data-view="grid"] .doc-card{display:flex;flex-direction:column;padding:0;overflow:hidden}
.doc-list[data-view="grid"] .doc-cover{display:block;background:var(--surface-muted);overflow:hidden;aspect-ratio:2.5/1}
.doc-list[data-view="grid"] .doc-cover.is-fallback{display:flex;align-items:center;justify-content:center}
.doc-list[data-view="grid"] .cover-monogram{font-size:2.6rem;font-weight:800;color:rgba(255,255,255,.9);text-shadow:0 1px 4px rgba(0,0,0,.25);line-height:1;user-select:none}
.doc-list[data-view="grid"] .doc-cover img{width:100%;height:100%;display:block;object-fit:cover;transition:transform .3s ease}
.doc-list[data-view="grid"] .doc-card:hover .cover-img{transform:scale(1.04)}
.doc-list[data-view="grid"] .doc-body{padding:14px 16px 16px;display:flex;flex-direction:column;flex:1;min-width:0}
.doc-list[data-view="grid"] .doc-title{font-size:1.02rem;margin-bottom:8px}
.doc-list[data-view="grid"] .doc-title a{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.doc-list[data-view="grid"] .doc-summary{display:none}
.doc-list[data-view="grid"] .meta-cat{display:none}
.doc-list[data-view="grid"] .doc-meta{margin-top:auto;font-size:.76rem;gap:4px 10px}
.doc-list[data-view="grid"] .doc-tags{margin-top:10px;gap:4px}
.doc-list[data-view="grid"] .tag{font-size:.68rem;padding:1px 8px;line-height:1.7}
@media (max-width:560px){
  .doc-list[data-view="grid"]{grid-template-columns:1fr}
  .doc-list[data-view="grid"] .doc-cover{aspect-ratio:auto}
  .doc-list[data-view="grid"] .doc-cover img{height:auto;object-fit:initial}
}

/* ===== Pagination ===== */
.pagination{display:flex;align-items:center;justify-content:center;gap:18px;margin-top:24px;flex-wrap:wrap}
.page-link{padding:8px 16px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font-weight:600;font-size:.9rem}
.page-link:hover{background:var(--brand-bg);border-color:var(--brand);text-decoration:none}
.page-info{color:var(--muted);font-size:.9rem}

/* ===== Home ===== */
.hero{background:linear-gradient(135deg,var(--brand),var(--accent));color:var(--on-brand);border-radius:18px;padding:34px 28px;margin-bottom:22px;box-shadow:var(--shadow)}
.hero-title{font-size:1.9rem;margin-bottom:6px;color:var(--on-brand)}
.hero-sub{margin:0;opacity:.95;font-size:1rem}
.hero-sub strong{font-size:1.2rem}
.home-cols{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:22px;align-items:start}
.block{margin-bottom:26px}
.block-title{font-size:1.05rem;margin-bottom:14px;padding-bottom:8px;border-bottom:2px solid var(--line)}
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.cat-card{display:flex;align-items:center;justify-content:space-between;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;box-shadow:var(--shadow);color:var(--ink);font-weight:600;transition:transform .1s,border-color .15s}
.cat-card:hover{transform:translateY(-2px);border-color:var(--brand);text-decoration:none}
.cat-count{font-size:1.1rem;color:var(--brand)}
.tag-cloud{display:flex;flex-wrap:wrap;gap:8px}
.tag-cloud-item{display:inline-flex;align-items:center}

/* ===== Reader ===== */
.breadcrumb{font-size:.85rem;color:var(--muted);margin-bottom:14px}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--brand)}
.reader{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px 30px;box-shadow:var(--shadow);max-width:860px;margin:0 auto}
.reader-title{font-size:1.7rem;margin-bottom:10px}
.reader-meta{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:.85rem;color:var(--muted);margin-bottom:12px}
.reader-meta a.meta-link{color:var(--brand);font-weight:600;text-decoration:none}
.reader-meta a.meta-link:hover{text-decoration:underline}
.reader-meta a.x-link{display:inline-flex;align-items:center;gap:3px;color:#fff;background:#000;border-radius:999px;padding:1px 12px;font-size:.78rem;font-weight:600}
.reader-meta a.x-link:hover{background:#1d9bf0;color:#fff;text-decoration:none}
.reader-summary{color:var(--ink-md);background:var(--surface-tint);border-left:3px solid var(--brand);padding:10px 14px;border-radius:0 8px 8px 0;margin:14px 0;font-size:.95rem}
.warn{color:var(--warn-ink);background:var(--warn-bg);border:1px solid var(--warn-border);padding:10px 14px;border-radius:8px;font-size:.9rem}

/* ===== Rendered Markdown ===== */
.markdown{margin-top:22px;font-size:1rem;line-height:1.8;color:var(--ink-soft);word-wrap:break-word;overflow-wrap:anywhere}
.markdown h1,.markdown h2,.markdown h3,.markdown h4{scroll-margin-top:78px}
.markdown h1,.markdown h2,.markdown h3,.markdown h4{line-height:1.35;margin:1.6em 0 .6em;color:var(--ink-strong)}
.markdown h1{font-size:1.5rem;padding-bottom:.3em;border-bottom:1px solid var(--line)}
.markdown h2{font-size:1.3rem;padding-bottom:.3em;border-bottom:1px solid var(--line)}
.markdown h3{font-size:1.12rem}
.markdown h4{font-size:1rem}
.markdown p{margin:.7em 0}
.markdown ul,.markdown ol{padding-left:1.6em;margin:.6em 0}
.markdown li{margin:.25em 0}
.markdown blockquote{margin:1em 0;padding:.4em 1em;border-left:4px solid var(--line);color:var(--ink-soft);background:var(--surface-nested);border-radius:0 6px 6px 0}
.markdown blockquote p{margin:.3em 0}
.markdown a{color:var(--brand);text-decoration:underline;text-underline-offset:2px}
.markdown img{border-radius:8px;margin:.6em 0;box-shadow:var(--shadow);display:block}
.markdown hr{border:0;border-top:1px solid var(--line);margin:1.6em 0}
.markdown code{font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;font-size:.88em;background:var(--surface-muted);padding:.15em .4em;border-radius:5px}
.markdown pre{background:var(--code-bg);color:var(--code-ink);padding:16px;border-radius:10px;overflow:auto;margin:1em 0;font-size:.86rem;line-height:1.6}
.markdown pre code{background:transparent;color:inherit;padding:0;font-size:inherit}
.markdown table{width:100%;border-collapse:collapse;margin:1em 0;font-size:.9rem;display:block;overflow-x:auto}
.markdown th,.markdown td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.markdown th{background:var(--surface-tint);font-weight:600}
.markdown tr:nth-child(even){background:var(--surface-nested)}

/* ===== Related ===== */
.related{margin-top:34px}
.related .doc-title{font-size:1rem}

/* ===== Stats ===== */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:14px;margin:18px 0}
.stat-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;text-align:center;box-shadow:var(--shadow)}
.stat-card.sm{padding:12px}
.stat-num{font-size:1.9rem;font-weight:800;color:var(--brand);line-height:1}
.stat-card.sm .stat-num{font-size:1.3rem}
.stat-label{color:var(--muted);font-size:.85rem;margin-top:6px}
.stat-details{margin:8px 0 18px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:4px 16px}
.stat-details summary{cursor:pointer;padding:10px 0;font-weight:600;color:var(--muted)}
.chart-block{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;margin-bottom:18px;box-shadow:var(--shadow)}

/* ===== Footer ===== */
.footer{max-width:1400px;margin:0 auto;padding:18px 16px;display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:.82rem;flex-wrap:wrap;border-top:1px solid var(--line)}

.empty{color:var(--muted);text-align:center;padding:40px;background:var(--card);border:1px dashed var(--line);border-radius:var(--radius)}

/* ===== Responsive ===== */
@media (max-width:960px){
  .home-cols{grid-template-columns:1fr}
}
@media (max-width:860px){
  :root{ --topbar-h:54px }
  .layout{grid-template-columns:1fr}
  .sidebar{
    position:fixed;top:var(--topbar-h);left:0;bottom:0;width:min(82vw,320px);z-index:60;
    border-radius:0;max-height:none;transform:translateX(-105%);transition:transform .25s ease;
    box-shadow:2px 0 20px rgba(0,0,0,.18)
  }
  body.sidebar-open .sidebar{transform:none}
  body.sidebar-open .sidebar-backdrop{display:block;position:fixed;inset:var(--topbar-h) 0 0 0;background:rgba(15,23,42,.45);z-index:55}
  .sidebar-toggle{display:inline-block}
  .nav-links{display:none}
  .search-form{max-width:none}
  .brand{font-size:1rem}
  .reader{padding:20px 16px}
  .reader-title{font-size:1.4rem}
  .content{padding:14px 12px 40px}
  .layout.ai-open{display:block;height:auto}
  .layout.ai-open .sidebar,.layout.ai-open .main,.layout.ai-open .splitter{display:none!important}
  .layout.ai-open .ai-panel{
    position:fixed;inset:var(--topbar-h) 0 0 0;height:auto;max-height:none;z-index:70;
    border-radius:0;border:0;min-width:0;flex:none;
  }
  .ai-toggle{padding:0 10px;font-size:.8rem}
}
@media (max-width:560px){
  .search-form .btn-search{display:none}
  .search-form input[type=search]{height:40px}
  /* Keep the topbar on one row: shrink the brand and tighten gaps. */
  .topbar-inner{gap:8px;padding:0 10px}
  .brand{font-size:.95rem;max-width:34vw;overflow:hidden;text-overflow:ellipsis}
  .theme-toggle{width:34px;height:34px;flex:0 0 auto}
  .sidebar-toggle{width:34px;height:34px;flex:0 0 auto}
  /* Filter toolbar: wrap cleanly and let text/date fields fill the row. */
  .toolbar{padding:10px;gap:6px}
  .toolbar .tb-input{flex:1 1 120px;min-width:0}
  .toolbar .tb-select{flex:0 0 auto}
  .hero{padding:26px 18px}
  .hero-title{font-size:1.5rem}
  .footer{flex-direction:column;align-items:center;text-align:center}
  .ai-toggle{padding:0 8px}
  /* Title + view switch: stack cleanly, keep the toggle reachable. */
  .main-head{gap:8px}
  .main-title{font-size:1.15rem;flex:1 1 auto;min-width:0}
  .head-right{gap:8px;flex:0 0 auto}
  .view-btn{padding:6px 8px}
  .view-btn svg{width:15px;height:15px}
}