/* 百科全览 · 阅览室索引样式 v2 */
:root{
  --paper:#F6F5F0; --card:#FDFCFA; --ink:#26333A; --faint:#71818C;
  --accent:#1F5E8C; --line:#D9D6CC; --seal-bg:#26333A; --seal-ink:#F6F5F0;
}
:root[data-theme="dark"]{
  --paper:#10161A; --card:#17222A; --ink:#D7DEE2; --faint:#8A99A3;
  --accent:#5FA8D3; --line:#26333A; --seal-bg:#2A3B46; --seal-ink:#D7DEE2;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  font-size:15px; line-height:1.6;
  transition:background .25s,color .25s;
}
@media (prefers-reduced-motion: reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
a{color:inherit}

/* ── 页首 ── */
header.masthead{max-width:1120px;margin:0 auto;padding:40px 20px 4px}
.mast-row{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap}
.brand{font-family:Georgia,"Times New Roman","Noto Serif SC","Source Han Serif SC",serif;
  font-size:clamp(30px,5vw,44px);font-weight:700;letter-spacing:.04em;line-height:1.15;margin:0}
.brand .of{color:var(--accent)}
.tagline{margin:6px 0 0;color:var(--faint);font-size:14px}
.statline{margin:10px 0 0;font-size:12.5px;color:var(--faint);letter-spacing:.02em}
.statline b{color:var(--accent);font-family:ui-monospace,monospace}
.head-tools{display:flex;align-items:center;gap:8px}
.tool-btn{background:var(--card);border:1px solid var(--line);color:var(--ink);
  border-radius:8px;padding:7px 12px;font-size:13px;cursor:pointer}
.tool-btn:hover{border-color:var(--accent);color:var(--accent)}

/* ── 索引卡抽屉 ── */
.indexbar{max-width:1120px;margin:18px auto 0;padding:0 20px}
.index-inner{display:flex;align-items:center;gap:8px;flex-wrap:wrap;border:1px solid var(--line);
  border-radius:10px;background:var(--card);padding:10px 12px}
.index-label{font-size:12px;color:var(--faint);letter-spacing:.12em;margin-right:2px}
.catnav{display:flex;gap:6px;flex-wrap:wrap}
.catnav a{font-size:13px;color:var(--ink);text-decoration:none;border:1px solid var(--line);
  border-radius:999px;padding:3px 11px;background:var(--paper)}
.catnav a:hover{border-color:var(--accent);color:var(--accent)}

/* ── 检索行 ── */
.searchrow{max-width:1120px;margin:14px auto 0;padding:0 20px;display:flex;gap:14px;align-items:baseline;flex-wrap:wrap}
.search{flex:1;min-width:240px;display:flex;align-items:center;gap:10px;border:1px solid var(--line);
  border-radius:10px;background:var(--card);padding:10px 14px}
.search:focus-within{border-color:var(--accent)}
.search input{flex:1;border:0;outline:0;background:transparent;color:var(--ink);font-size:15px}
.search kbd,.dialog kbd{font-size:11px;color:var(--faint);border:1px solid var(--line);border-radius:4px;padding:1px 6px}
.result-note{font-size:12.5px;color:var(--faint)}
.result-note b{color:var(--accent);font-family:ui-monospace,monospace}

/* ── 双栏布局 + 侧边 TOC ── */
.layout{max-width:1120px;margin:0 auto;padding:0 20px;display:grid;grid-template-columns:1fr;gap:24px}
.toc{display:none}
@media (min-width:1080px){
  .layout{grid-template-columns:170px 1fr}
  .toc{position:sticky;top:20px;align-self:start;display:flex;flex-direction:column;gap:2px;
    border-left:2px solid var(--line);padding-left:12px;margin-top:44px;max-height:calc(100vh - 80px);overflow:auto}
  .toc a{font-size:12px;color:var(--faint);text-decoration:none;padding:4px 0}
  .toc a:hover{color:var(--accent)}
}
main{min-width:0;padding-bottom:70px}
.shelf{margin-top:44px}
.shelf-head{display:flex;align-items:baseline;gap:12px;border-bottom:2px solid var(--ink);padding-bottom:8px}
.seal{font-family:ui-monospace,SFMono-Regular,monospace;font-size:12px;font-weight:700;
  background:var(--seal-bg);color:var(--seal-ink);border-radius:4px;padding:2px 7px;letter-spacing:.08em}
.shelf-head h2{font-family:Georgia,"Times New Roman","Noto Serif SC","Source Han Serif SC",serif;
  font-size:22px;margin:0;letter-spacing:.03em}
.shelf-head .note{font-size:12.5px;color:var(--faint)}

/* ── 卡片 ── */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(248px,1fr));gap:14px;margin-top:16px}
.card{position:relative;display:flex;flex-direction:column;gap:4px;background:var(--card);
  border:1px solid var(--line);border-radius:10px;padding:14px 15px 12px;text-decoration:none;
  transition:transform .15s,border-color .15s,box-shadow .15s;overflow:visible}
.card::before{content:"";position:absolute;top:0;left:14px;right:14px;height:3px;border-radius:0 0 3px 3px;
  background:var(--accent);opacity:0;transition:opacity .15s}
.card:hover{transform:translateY(-2px);border-color:var(--accent);box-shadow:0 4px 14px rgba(0,0,0,.07)}
.card:hover::before{opacity:1}
.card[hidden]{display:none}
.name-row{display:flex;align-items:flex-start;justify-content:space-between;gap:8px}
.name-row h3{margin:0;font-size:16.5px;font-weight:650;letter-spacing:.02em}
.star{background:none;border:0;cursor:pointer;font-size:15px;line-height:1;color:var(--faint);padding:2px}
.star.on{color:#D9A521}
.alias{font-size:12px;color:var(--faint);letter-spacing:.02em}
.desc{margin:2px 0 4px;font-size:13px;color:var(--faint);display:-webkit-box;-webkit-line-clamp:2;
  -webkit-box-orient:vertical;overflow:hidden}
.foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:8px}
.tags{display:flex;gap:5px;flex-wrap:wrap}
.tag{font-size:11px;color:var(--faint);border:1px solid var(--line);border-radius:4px;padding:1px 6px}

/* ── 列表模式 ── */
body.list-mode .grid{display:flex;flex-direction:column;gap:8px}
body.list-mode .card{flex-direction:row;align-items:baseline;gap:10px;padding:9px 14px;border-radius:8px}
body.list-mode .card::before{display:none}
body.list-mode .name-row{flex:0 0 auto;min-width:190px;align-items:baseline}
body.list-mode .name-row h3{font-size:14.5px}
body.list-mode .alias{display:none}
body.list-mode .desc{flex:1;margin:0;-webkit-line-clamp:1;white-space:nowrap;text-overflow:ellipsis}
body.list-mode .foot{margin:0;flex-shrink:0}
body.list-mode .tags{display:none}
body.list-mode .star{font-size:14px}

/* ── 译本菜单 ── */
.vm{position:relative;flex-shrink:0}
.vm-btn{font-size:12px;color:var(--accent);background:var(--paper);border:1px solid var(--line);
  border-radius:6px;padding:2px 8px;cursor:pointer}
.vm-btn:hover,.vm-btn[aria-expanded="true"]{border-color:var(--accent)}
.vm-list{position:absolute;right:0;bottom:calc(100% + 6px);z-index:30;min-width:110px;
  background:var(--card);border:1px solid var(--line);border-radius:8px;padding:4px;
  box-shadow:0 6px 18px rgba(0,0,0,.12);display:flex;flex-direction:column}
.vm-it{all:unset;cursor:pointer;font-size:13px;padding:6px 10px;border-radius:5px;color:var(--ink)}
.vm-it:hover{background:var(--paper);color:var(--accent)}
.vm-it.cur{color:var(--accent);font-weight:600}
.vm-it.cur::after{content:" ✓"}

/* ── 返回顶部 / 关于 / 页脚 ── */
#backtop{position:fixed;right:22px;bottom:22px;z-index:40;width:42px;height:42px;border-radius:50%;
  background:var(--card);border:1px solid var(--line);color:var(--ink);font-size:17px;cursor:pointer;
  box-shadow:0 4px 14px rgba(0,0,0,.10);opacity:0;pointer-events:none;transition:opacity .2s,transform .2s}
#backtop.show{opacity:1;pointer-events:auto}
#backtop:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-2px)}
.overlay{position:fixed;inset:0;z-index:50;background:rgba(15,22,26,.45);display:flex;
  align-items:center;justify-content:center;padding:20px}
.dialog{background:var(--card);border:1px solid var(--line);border-radius:14px;max-width:520px;
  padding:26px 28px;box-shadow:0 18px 50px rgba(0,0,0,.22)}
.dialog h2{font-family:Georgia,"Times New Roman","Noto Serif SC",serif;margin:0 0 12px;font-size:20px}
.dialog p{font-size:13.5px;color:var(--ink);margin:8px 0}
#none{margin-top:60px;text-align:center;color:var(--faint);font-size:14px}
footer{border-top:1px solid var(--line);margin-top:40px}
footer .inner{max-width:1120px;margin:0 auto;padding:18px 20px;display:flex;justify-content:space-between;
  gap:10px;flex-wrap:wrap;font-size:12.5px;color:var(--faint)}

/* ── 响应式 ── */
@media (max-width:640px){
  header.masthead{padding-top:26px}
  .brand{font-size:30px}
  .grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px}
  .card{padding:12px}
  .name-row h3{font-size:15px}
  .desc{font-size:12px}
  .shelf-head .note{display:none}
  .statline{display:none}
  body.list-mode .name-row{min-width:120px}
  .searchrow{flex-direction:column;align-items:stretch;gap:8px}
  .search{min-width:0}
  .search input{min-width:0;font-size:14px}
  .search kbd{display:none}
  .result-note{align-self:flex-end}
}