/* ===== 古籍阅读 · 屿斋 ===== */
:root{
  --h: 54px;
  --accent:#6fa67c; --accent-strong:#4f8862; --accent-soft:#d8e8d2;
  --ink:#2c3531; --muted:#8a8678; --line:#ece3d0;
  --font-kai:'Kaiti SC','STKaiti','KaiTi','楷体',serif;
  --font-ming:'Songti SC','SimSun','宋体','NSimSun',serif;
  --font-hei:'PingFang SC','Microsoft YaHei','黑体',sans-serif;
}
/* paper —— 默认纸面 */
html[data-theme="paper"]{ --bg:#f7f3e9; --paper:#fffdf6; --ink:#2c3531; --muted:#8a8678; --line:#ece3d0; --hdr:#fffdf6ee; }
/* sepia —— 米黄古籍 */
html[data-theme="sepia"]{ --bg:#efe3cc; --paper:#f7ecd6; --ink:#4a3b24; --muted:#8f7a58; --line:#e0cfae; --hdr:#f7ecd6e8; }
/* dark —— 夜间 */
html[data-theme="dark"]{ --bg:#15171c; --paper:#1d2027; --ink:#e6e8ee; --muted:#8a90a0; --line:#31363f; --hdr:#1d2027e8; --accent:#82bf90; --accent-strong:#6ba87c; }

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);
  font-family:var(--font-hei);
  font-size:15px;line-height:1.6;
  -webkit-font-smoothing:antialiased;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
.hidden{display:none!important}

/* 顶部细条 */
.top,.foot{background:transparent;border-bottom:1px solid var(--line)}
.top{position:sticky;top:0;z-index:40;backdrop-filter:blur(6px);background:color-mix(in srgb,var(--bg) 78%, transparent)}
.top-in{max-width:1080px;margin:0 auto;display:flex;align-items:center;gap:12px;padding:10px 18px;font-size:14px}
.home-link{display:flex;align-items:center;gap:8px;text-decoration:none;color:var(--ink);font-weight:600}
.home-link .dot{width:9px;height:9px;border-radius:50%;background:var(--accent)}
.crumb{color:var(--muted)}
.foot{border-top:1px solid var(--line);color:var(--muted);text-align:center;font-size:12px;padding:14px}
.foot.thin{margin-top:8px}

/* ===== 屏幕切换 ===== */
.screen{display:none}
.screen.show{display:block}

/* ===== 书库 ===== */
#shelf{max-width:1080px;margin:0 auto;padding:26px 18px 40px}
.shelf-head h1{font-size:26px;margin:6px 0 6px;letter-spacing:.5px}
.shelf-head h1::before{content:"";display:inline-block;width:10px;height:10px;background:var(--accent);margin-right:10px;border-radius:2px}
.sub{color:var(--muted);margin:0 0 22px;font-size:14px}
#shelfGrid{display:block}
.cat-bar{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 4px}
.cat-chip{padding:6px 14px;border-radius:99px;border:1px solid var(--line);background:var(--paper);color:var(--ink);font-size:13px;transition:background .12s,color .12s}
.cat-chip.on{background:var(--accent);border-color:var(--accent);color:#fff}
.cat-chip:not(.on):hover{background:var(--accent-soft);color:var(--accent-strong)}
.cat-group{margin-bottom:26px}
.cat-group h2{font-size:16px;margin:0 0 12px;color:var(--accent-strong);display:flex;align-items:center;gap:10px;font-weight:700}
.cat-group h2::after{content:"";flex:1;height:1px;background:var(--line)}
.cat-group h2 .cnt{color:var(--muted);font-weight:400;font-size:12.5px}
.cat-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(235px,1fr));gap:16px}
.book{border:1px solid var(--line);border-radius:12px;background:var(--paper);
  padding:16px 16px 13px;cursor:pointer;position:relative;overflow:hidden;
  transition:transform .12s,box-shadow .12s;text-align:left}
.book:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(82,64,38,.12)}
.book .spine{position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--accent);opacity:.75}
.book .bt{font-size:17px;font-weight:700;margin:2px 0 6px;font-family:var(--font-kai)}
.book .bm{color:var(--muted);font-size:12.5px;margin:0;min-height:19px}
.book .chars{color:var(--muted);font-size:12px;margin-top:10px}
.book .continue{display:inline-block;margin-top:8px;font-size:12px;color:var(--accent-strong);font-weight:600}
.book .tags{display:flex;flex-wrap:wrap;gap:5px;margin-top:9px}
.book .tag{font-size:11px;color:var(--muted);border:1px solid var(--line);border-radius:99px;padding:1px 8px}
.book .tag.cat{color:var(--accent-strong);border-color:color-mix(in srgb,var(--accent) 45%, transparent)}
.book .pbar{height:4px;background:var(--line);border-radius:99px;margin-top:9px;overflow:hidden}
.book .pfill{height:100%;background:var(--accent);width:0}
.book.empty .spine{background:var(--line)}
.loading{color:var(--muted);font-size:14px;text-align:center;padding:30px 0}

/* ===== 阅读器 ===== */
#reader{position:fixed;inset:0;display:none;flex-direction:column;background:var(--paper);z-index:60}
#reader.show{display:flex}
#topbar{height:var(--h);flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;
  padding:0 8px 0 6px;background:var(--hdr);backdrop-filter:blur(6px);border-bottom:1px solid var(--line);z-index:30}
.tb-left{display:flex;align-items:center;gap:4px;min-width:0}
.tb-title{display:flex;flex-direction:column;line-height:1.15;min-width:0;padding-left:6px}
.tb-title #bookTitle{font-weight:700;font-size:15px;font-family:var(--font-kai);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tb-title #bookSub{color:var(--muted);font-size:11px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tb-right{display:flex;align-items:center;gap:2px}
.icon{width:34px;height:34px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;
  font-size:16px;line-height:1;transition:background .12s}
.icon:hover{background:var(--accent-soft);color:var(--accent-strong)}
#btnSettings{font-weight:600;font-size:13px;letter-spacing:.5px}
.seg{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;margin-left:6px}
.seg button{padding:6px 10px;font-size:12.5px;color:var(--muted)}
.seg button.on{background:var(--accent);color:#fff}
.seg button:not(.on):hover{background:var(--accent-soft);color:var(--accent-strong)}

#progress{height:3px;flex:0 0 auto;background:var(--line)}
#progfill{height:100%;width:0;background:var(--accent);transition:width .1s}

/* 阅读区 */
#region{flex:1 1 auto;position:relative;min-height:0}
.view{position:absolute;inset:0;display:none}
.view.active{display:block}
#scrollView{overflow-y:auto;overscroll-behavior:contain;background:var(--paper)}
#pagesView{overflow:hidden;margin:0 auto;background:var(--paper);padding-top:26px}

/* 滚动模式正文 */
.scroll-body{max-width:820px;margin:0 auto;padding:34px 22px 120px}
.scroll-body .meta{color:var(--muted);font-size:13px;margin-bottom:8px}
.scroll-body .doc-title{font-family:var(--font-kai);font-size:30px;font-weight:700;margin:6px 0 2px;text-align:center}
.scroll-body .doc-sub{color:var(--muted);text-align:center;font-size:14px;margin:0 0 26px}

/* 通用块 */
.block-h1,.block-h2,.block-p,.block-title{animation:none}
.block-title{font-family:var(--font-kai);font-size:2em;font-weight:700;text-align:center;
  margin:0 0 .3em;padding-bottom:14px;letter-spacing:2px;border-bottom:1px solid var(--line)}
.scroll-body .block-title,.scroll-body .block-h1,.scroll-body .block-h2,.scroll-body .block-p{break-inside:avoid;break-after:auto}
.block-h1{font-family:var(--font-kai);font-size:1.55em;font-weight:700;margin:1.7em 0 .5em;
  padding-left:.55em;position:relative;break-after:avoid}
.block-h1::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:4px;background:var(--accent);border-radius:2px}
.block-h1:first-of-type{margin-top:.2em}
.block-h2{font-family:var(--font-kai);font-size:1.22em;font-weight:700;margin:1.35em 0 .35em;color:var(--ink)}
.block-p{margin:0 0 .85em;text-align:justify;text-justify:inter-ideograph}

/* 阅读排版变量由 JS 设置到 #reader */
#reader .scroll-body,#reader #pagesView{font-family:var(--rf,var(--font-kai));font-size:var(--rs,18px);line-height:var(--rl,1.95)}
#pagesView{padding:40px 0;column-width:auto}
#pagesView.cols{column-fill:auto;column-gap:0;overflow:hidden}

/* 段落中的 mark */
mark{background:#ffdf80;color:inherit;border-radius:2px;padding:0 1px}

/* ===== 目录侧栏 ===== */
.panel{position:fixed;top:0;bottom:0;background:var(--paper);z-index:50;box-shadow:0 0 40px rgba(0,0,0,.18);
  display:flex;flex-direction:column;transition:transform .18s ease}
.panel.toc{left:0;width:min(320px,86vw);transform:translateX(-102%)}
.panel.toc.show{transform:translateX(0)}
.panel.search{right:0;width:min(360px,94vw);transform:translateX(102%)}
.panel.search.show{transform:translateX(0)}
.panel-head{height:var(--h);flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;
  padding:0 8px 0 16px;border-bottom:1px solid var(--line);font-weight:700;font-size:15px}
.panel-head .icon{width:30px;height:30px;font-size:18px}

.toc-list{overflow-y:auto;padding:10px 6px 40px;flex:1}
.toc-g{color:var(--muted);font-size:11.5px;letter-spacing:1px;padding:12px 10px 4px;font-weight:700}
.toc-i{display:block;width:100%;text-align:left;padding:6px 10px;border-radius:7px;color:var(--ink);
  font-size:14.5px;line-height:1.5;font-family:var(--font-kai)}
.toc-i:hover{background:var(--accent-soft);color:var(--accent-strong)}
.toc-i.l2{padding-left:22px;font-size:13.5px;color:var(--ink)}
.toc-i.cur{background:var(--accent-soft);color:var(--accent-strong)}

/* ===== 搜索 ===== */
.panel.search .search-form{display:flex;gap:6px;padding:12px;border-bottom:1px solid var(--line)}
#searchInput{flex:1;border:1px solid var(--line);border-radius:8px;background:var(--bg);
  padding:9px 12px;color:var(--ink);font-size:14px;outline:none}
#searchInput:focus{border-color:var(--accent)}
#searchMeta{color:var(--muted);font-size:12.5px;padding:8px 14px}
.search-results{list-style:none;margin:0;padding:0 8px 40px;overflow-y:auto;flex:1}
.search-results li{font-size:13.5px;padding:9px 10px;border-bottom:1px dashed var(--line);cursor:pointer;line-height:1.6}
.search-results li:hover{background:var(--accent-soft)}
.search-results .sc{color:var(--muted);font-size:12px}
.search-results b{color:var(--accent-strong)}

/* ===== 设置弹层 ===== */
.panel.settings{position:absolute;top:calc(var(--h) + 4px);right:10px;width:min(320px,90vw);
  box-shadow:0 12px 34px rgba(0,0,0,.18);border:1px solid var(--line);border-radius:14px;height:auto;padding:14px 16px;gap:12px}
.row{display:flex;align-items:center;justify-content:space-between;gap:10px}
.row label,.row .lbl{font-size:13px;color:var(--muted)}
.swatches{display:flex;gap:8px}
.sw{width:24px;height:24px;border-radius:50%;border:2px solid transparent;cursor:pointer}
.sw.on{border-color:var(--ink)}
.sw[data-theme="paper"]{background:#fffdf6;border-color:#e6dcc2}
.sw[data-theme="sepia"]{background:#f0ddb9}
.sw[data-theme="dark"]{background:#2b313c}
select{font:inherit;padding:5px 8px;border:1px solid var(--line);border-radius:7px;background:var(--bg);color:var(--ink)}
.fsize{display:flex;align-items:center;gap:8px}
.fsize span{min-width:34px;text-align:center;font-weight:600;font-size:14px}
.note{color:var(--muted);font-size:12px}

/* 翻页条（含上一页/下一页） */
.pageind{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:40;
  display:flex;align-items:center;gap:2px;
  background:color-mix(in srgb,var(--ink) 82%,transparent);color:#fff;
  border-radius:99px;padding:3px 4px;font-size:12.5px;pointer-events:auto;
  box-shadow:0 4px 14px rgba(0,0,0,.25)}
.pageind .pgi{color:#fff;background:none;border:0;font-size:18px;line-height:1;
  width:30px;height:30px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}
.pageind .pgi:hover{background:rgba(255,255,255,.22)}
#pgInfo{min-width:62px;text-align:center;user-select:none;font-variant-numeric:tabular-nums}

/* 掩膜 */
.scrim{position:fixed;inset:0;background:rgba(20,20,20,.28);z-index:45;opacity:0;pointer-events:none;transition:opacity .18s}
.scrim.show{opacity:1;pointer-events:auto}

/* ===== 响应式 ===== */
@media (max-width:640px){
  .scroll-body{padding:22px 16px 120px}
  .scroll-body .doc-title{font-size:24px}
  .tb-title #bookSub{display:none}
  #shelf{padding-top:16px}
}
@media (max-width:380px){
  .seg button{padding:6px 7px;font-size:11.5px}
  #btnSettings{width:32px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}
@keyframes rdrIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
#reader.show{animation:rdrIn .16s ease-out}
#shelf.show{animation:fadeIn .2s ease}