/* 恩华书屋 Enhua Library · V1.0 */
:root{
  --ink:#0F2A3A; --ink-2:#16394f; --teal:#1F5B57; --gold:#C8A96A; --gold-d:#a9884f;
  --cream:#F3E9D6; --paper:#FAF6EF; --mist:#E6E2DB;
  --bg:var(--paper); --bg-soft:#fffdf7; --card:#fffdf7;
  --text:#35322b; --muted:#7d7668; --line:#e2dac6; --link:var(--teal);
  --font-cn:"Source Han Serif SC","Noto Serif SC","Songti SC",SimSun,serif;
  --font-en:Merriweather,"Source Serif 4",Georgia,serif;
  --shadow:0 2px 14px rgba(15,42,58,.08);
}
[data-theme="eyecare"]{
  --bg:#F3E9D6; --bg-soft:#f7efdc; --card:#faf3e1;
  --text:#3b342a; --muted:#847a63; --line:#dccfab;
}
[data-theme="night"]{
  --bg:#0F2A3A; --bg-soft:#122e40; --card:#143349;
  --text:#e7dfcb; --muted:#a79d83; --line:#2b4b60; --link:#93d3c9;
  --shadow:0 2px 14px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:var(--font-cn);font-size:17px;line-height:1.9;transition:background .3s}
img{max-width:100%}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1180px;margin:0 auto;padding:0 22px}
h1,h2,h3{font-weight:600;letter-spacing:.06em;line-height:1.5}
.en{font-family:var(--font-en)}

/* ---------- 页眉 ---------- */
.site-header{background:var(--bg-soft);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.header-in{display:flex;align-items:center;gap:26px;max-width:1180px;margin:0 auto;padding:12px 22px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand img{width:46px;height:46px}
.brand-name{font-size:22px;font-weight:700;color:var(--ink);letter-spacing:.12em;line-height:1.2}
[data-theme="night"] .brand-name{color:var(--text)}
.brand-sub{font-size:11px;color:var(--muted);letter-spacing:.18em}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:8px}
.main-nav a,.main-nav summary{padding:8px 14px;color:var(--text);font-size:16px;white-space:nowrap;cursor:pointer;list-style:none}
.main-nav a:hover,.main-nav summary:hover{color:var(--gold-d);text-decoration:none}
.main-nav a.active{color:var(--ink);border-bottom:2px solid var(--gold)}
[data-theme="night"] .main-nav a.active{color:var(--gold)}
.nav-drop{position:relative}
.nav-drop summary::-webkit-details-marker{display:none}
.nav-drop[open] summary{color:var(--gold-d)}
.drop-menu{position:absolute;top:100%;left:0;background:var(--card);border:1px solid var(--line);
  border-radius:8px;box-shadow:var(--shadow);min-width:150px;padding:6px;z-index:60}
.drop-menu a{display:block;padding:8px 14px;font-size:15px}
.search-box{margin-left:auto;display:flex}
.search-box input{border:1px solid var(--line);background:var(--bg);color:var(--text);
  border-radius:20px 0 0 20px;padding:7px 16px;font-size:14px;font-family:inherit;width:210px;outline:none}
.search-box button{border:1px solid var(--line);border-left:0;background:var(--ink);color:#f4efe2;
  border-radius:0 20px 20px 0;padding:7px 14px;cursor:pointer;font-size:14px;font-family:inherit}
.nav-toggle-btn{display:none;background:none;border:1px solid var(--line);border-radius:6px;
  padding:6px 10px;font-size:18px;cursor:pointer;color:var(--text)}

/* ---------- 金饰分隔线 ---------- */
.divider{display:flex;align-items:center;gap:14px;margin:26px 0;color:var(--gold)}
.divider::before,.divider::after{content:"";height:1px;flex:1;
  background:linear-gradient(90deg,transparent,var(--gold),transparent)}
.divider .star{font-size:15px;line-height:1}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 26px;border-radius:8px;
  font-size:16px;font-family:inherit;cursor:pointer;border:1px solid transparent;letter-spacing:.08em}
.btn-primary{background:var(--ink);color:#f6f1e3}
.btn-primary:hover{background:var(--ink-2);text-decoration:none;color:#fff}
.btn-secondary{background:transparent;border-color:var(--gold-d);color:var(--ink)}
[data-theme="night"] .btn-secondary{color:var(--text)}
.btn-secondary:hover{background:rgba(200,169,106,.12);text-decoration:none}
.btn-row{display:flex;gap:14px;flex-wrap:wrap}

/* ---------- 首页 hero ---------- */
.hero{position:relative;overflow:hidden;background:#0d2434}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.5}
.hero-veil{position:absolute;inset:0;background:linear-gradient(180deg,rgba(250,246,239,.88),rgba(250,246,239,.55) 55%,rgba(250,246,239,.92))}
.hero-in{position:relative;text-align:center;padding:84px 22px 70px;max-width:860px;margin:0 auto}
.hero-logo{width:96px;height:96px;background:var(--paper);border-radius:50%;padding:8px;
  box-shadow:var(--shadow);border:1px solid var(--gold)}
.hero h1{font-size:64px;margin:18px 0 4px;color:var(--ink);letter-spacing:.22em;font-weight:700}
.hero .hero-sub{font-size:20px;color:var(--gold-d);letter-spacing:.42em;margin:6px 0 10px}
.hero .hero-tag{font-size:17px;letter-spacing:.3em;color:var(--teal);margin:0 0 14px}
.hero .hero-intro{font-size:16px;color:#5c564a;max-width:640px;margin:0 auto 30px}
.hero-cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* ---------- 区块标题 ---------- */
.section{padding:52px 0 8px}
.section-head{display:flex;align-items:baseline;gap:14px;margin-bottom:6px}
.section-head h2{font-size:24px;margin:0;color:var(--ink)}
[data-theme="night"] .section-head h2{color:var(--text)}
.section-head .more{margin-left:auto;font-size:14px}

/* ---------- 书卡 ---------- */
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:22px;margin-top:18px}
.book-card{background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:22px;display:flex;gap:18px;box-shadow:var(--shadow)}
.book-card .meta h3{margin:0 0 6px;font-size:19px}
.book-card .meta .en-title{font-size:13px;color:var(--muted);font-family:var(--font-en)}
.book-card .meta .byline{font-size:14px;color:var(--muted);margin:8px 0}
.book-card .desc{font-size:14.5px;color:var(--text);margin:8px 0 14px;display:-webkit-box;
  -webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.mini-cover{width:86px;flex-shrink:0}
.mini-book-cover{position:relative;background:linear-gradient(165deg,#0e2839 0%,#1b4258 100%);
  border-radius:3px 6px 6px 3px;color:#f0e3c2;display:flex;align-items:center;justify-content:center;
  text-align:center;aspect-ratio:3/4.2;padding:10px 6px;overflow:hidden;box-shadow:var(--shadow)}
.mini-book-cover::before{content:"";position:absolute;inset:5px;border:1px solid rgba(200,169,106,.7);
  border-radius:2px 4px 4px 2px;pointer-events:none}
.mini-book-cover .t{font-weight:600;line-height:1.5;letter-spacing:.12em;position:relative;
  display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}

/* CSS 藏青封面 */
.book-cover{position:relative;background:linear-gradient(165deg,#0e2839 0%,#1b4258 100%);
  border-radius:4px 8px 8px 4px;color:#e9dcc0;display:flex;flex-direction:column;align-items:center;
  justify-content:center;text-align:center;padding:26px 14px;box-shadow:var(--shadow);overflow:hidden}
.book-cover::before{content:"";position:absolute;inset:9px;border:1px solid rgba(200,169,106,.85);border-radius:2px 5px 5px 2px;pointer-events:none}
.book-cover::after{content:"";position:absolute;inset:13px;border:1px solid rgba(200,169,106,.35);border-radius:2px 4px 4px 2px;pointer-events:none}
.book-cover .motif{width:44px;height:44px;margin-bottom:10px;opacity:.92}
.book-cover .cov-title{font-size:21px;letter-spacing:.28em;color:#f0e3c2;margin:2px 0;font-weight:600;text-indent:.28em}
.book-cover .cov-sub{font-size:11px;letter-spacing:.2em;color:rgba(200,169,106,.85)}
.book-cover .cov-author{font-size:12px;color:rgba(233,220,192,.75);margin-top:10px}
.book-cover .cov-year{font-size:11px;color:rgba(200,169,106,.7);font-family:var(--font-en)}
.book-cover.tall{aspect-ratio:3/4.4}

/* 印章徽章 */
.seal{display:inline-block;background:var(--teal);color:#f4efe2;font-size:13px;letter-spacing:.2em;
  padding:5px 14px 5px 16px;border-radius:4px;position:relative;text-indent:.2em}
.seal::after{content:"";position:absolute;inset:2px;border:1px solid rgba(244,239,226,.5);border-radius:2px;pointer-events:none}

/* ---------- 专题卡 ---------- */
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:18px}
.topic-card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:22px;
  box-shadow:var(--shadow);transition:transform .2s}
.topic-card:hover{transform:translateY(-3px)}
.topic-card:hover a.t{color:var(--gold-d)}
.topic-card .t-ico{font-size:30px}
.topic-card h3{margin:10px 0 6px;font-size:18px}
.topic-card h3 a{color:var(--ink)}
[data-theme="night"] .topic-card h3 a{color:var(--text)}
.topic-card p{font-size:14px;color:var(--muted);margin:0}

/* ---------- 最近更新 / 统计 ---------- */
.update-list{margin:14px 0 0;padding:0;list-style:none}
.update-list li{display:flex;gap:16px;align-items:baseline;background:var(--card);border:1px solid var(--line);
  border-radius:8px;padding:14px 20px;margin-bottom:10px}
.update-list .date{font-family:var(--font-en);font-size:14px;color:var(--muted);white-space:nowrap}
.stats{display:flex;gap:0;margin:34px 0 10px;background:var(--card);border:1px solid var(--line);
  border-radius:10px;overflow:hidden;box-shadow:var(--shadow)}
.stat{flex:1;text-align:center;padding:22px 10px;border-right:1px solid var(--line)}
.stat:last-child{border-right:0}
.stat .num{font-size:34px;color:var(--ink);font-family:var(--font-en)}
[data-theme="night"] .stat .num{color:var(--gold)}
.stat .lbl{font-size:13px;color:var(--muted);letter-spacing:.15em}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink);color:#cfc6ae;margin-top:64px}
.footer-in{max-width:1180px;margin:0 auto;padding:44px 22px 30px;display:grid;
  grid-template-columns:1fr 1fr;gap:30px}
.footer-brand{display:flex;gap:14px;align-items:center}
.footer-brand img{width:52px;height:52px}
.footer-brand .n{font-size:20px;letter-spacing:.15em;color:#f0e8d2}
.footer-brand .s{font-size:12px;color:#9d937a;letter-spacing:.1em}
.footer-quote{font-size:15px;letter-spacing:.2em;color:#e5d9b8;text-align:right}
.footer-note{grid-column:1/-1;border-top:1px solid rgba(200,169,106,.25);padding-top:18px;
  font-size:13px;color:#9d937a;line-height:1.9}

/* ---------- 面包屑 ---------- */
.crumb{font-size:14px;color:var(--muted);margin:22px 0 6px}
.crumb a{color:var(--muted)}

/* ---------- 书籍详情 ---------- */
.book-detail{display:grid;grid-template-columns:300px minmax(0,1fr) 300px;gap:34px;margin:18px 0 30px}
.book-main h1{font-size:38px;margin:6px 0 2px;color:var(--ink);letter-spacing:.1em}
[data-theme="night"] .book-main h1{color:var(--text)}
.book-main .en-title{font-family:var(--font-en);font-size:16px;color:var(--muted);margin:0 0 10px}
.book-main .byline{font-size:15px;color:var(--muted);margin:10px 0}
.copyright-line{display:flex;gap:12px;align-items:center;margin:16px 0;flex-wrap:wrap}
.copyright-line .note{font-size:13.5px;color:var(--muted)}
.book-intro{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:22px 24px;
  margin:20px 0;box-shadow:var(--shadow)}
.book-intro h2,.side-block h2{font-size:17px;color:var(--ink);letter-spacing:.25em;margin:0 0 12px}
[data-theme="night"] .book-intro h2,[data-theme="night"] .side-block h2{color:var(--gold)}
.book-intro p{font-size:15.5px;text-align:justify}
.dl-buttons{display:flex;gap:12px;flex-wrap:wrap;margin:18px 0}
.dl-btn{display:inline-flex;flex-direction:column;align-items:center;gap:2px;min-width:132px;
  border:1px solid var(--gold-d);border-radius:8px;padding:10px 16px;background:var(--card);color:var(--ink)}
[data-theme="night"] .dl-btn{color:var(--text)}
.dl-btn:hover{text-decoration:none;background:rgba(200,169,106,.12)}
.dl-btn .t{font-size:15px}
.dl-btn .s{font-size:12px;color:var(--muted)}
.dl-btn.disabled{opacity:.55;cursor:default}
.toc-list{columns:2;column-gap:30px;list-style:none;margin:12px 0 0;padding:0}
.toc-list li{break-inside:avoid;padding:7px 0;border-bottom:1px dotted var(--line);font-size:15.5px}
.toc-list li a{color:var(--text)}
.toc-list li a:hover{color:var(--gold-d)}
.toc-list .no{font-family:var(--font-en);font-size:13px;color:var(--gold-d);margin-right:10px}
.side-block{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:20px;
  margin-bottom:20px;box-shadow:var(--shadow)}
.info-table{width:100%;font-size:14px;border-collapse:collapse}
.info-table th,.info-table td{padding:8px 4px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.info-table th{color:var(--muted);font-weight:400;white-space:nowrap;width:76px}
.rights p{font-size:14px;color:var(--muted);text-align:justify}
.empty-note{font-size:14.5px;color:var(--muted);background:var(--bg);border:1px dashed var(--line);
  border-radius:8px;padding:18px;text-align:center}

/* ---------- 阅读页 ---------- */
.reader{display:grid;grid-template-columns:250px minmax(0,1fr) 230px;gap:26px;margin:20px 0 40px;align-items:start}
.read-side{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:18px;
  position:sticky;top:96px;box-shadow:var(--shadow)}
.read-side .mini-book{display:flex;gap:12px;margin-bottom:14px}
.read-side .mini-book .mini-cover{width:56px}
.read-side .mini-book h3{font-size:15px;margin:0 0 4px}
.read-side .mini-book p{font-size:12.5px;color:var(--muted);margin:0}
.side-tabs{display:flex;border-bottom:1px solid var(--line);margin-bottom:8px}
.side-tabs button{flex:1;background:none;border:0;border-bottom:2px solid transparent;padding:8px;
  font-size:15px;font-family:inherit;color:var(--muted);cursor:pointer}
.side-tabs button.on{color:var(--ink);border-bottom-color:var(--gold);font-weight:600}
[data-theme="night"] .side-tabs button.on{color:var(--gold)}
.chap-list{list-style:none;margin:0;padding:0;max-height:46vh;overflow:auto;font-size:14.5px}
.chap-list li a{display:block;padding:7px 10px;border-radius:6px;color:var(--text)}
.chap-list li a:hover{background:rgba(200,169,106,.14);text-decoration:none}
.chap-list li.cur a{background:var(--cream);color:var(--ink);font-weight:600}
[data-theme="night"] .chap-list li.cur a{background:#1d4258;color:var(--gold)}
.progress{margin-top:14px;font-size:13px;color:var(--muted)}
.progress .bar{height:6px;background:var(--mist);border-radius:3px;overflow:hidden;margin-top:6px}
.progress .bar i{display:block;height:100%;background:linear-gradient(90deg,var(--gold-d),var(--gold));width:0}
.read-main{min-width:0}
.page-nav{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.page-nav a{font-size:14.5px;border:1px solid var(--line);border-radius:20px;padding:6px 18px;
  background:var(--card);color:var(--text)}
.page-nav a:hover{border-color:var(--gold);text-decoration:none}
.page-nav a.ghost{visibility:hidden}
.volume-tag{text-align:center;font-size:14px;color:var(--muted);letter-spacing:.35em;margin:14px 0 4px}
.article-head{text-align:center;margin-bottom:8px}
.article-head h1{font-size:32px;color:var(--ink);margin:6px 0 2px;letter-spacing:.12em}
[data-theme="night"] .article-head h1{color:var(--text)}
.article-body{font-size:1.06rem;line-height:1.9;text-align:justify;overflow-wrap:break-word}
.article-body p{text-indent:2em;margin:.85em 0}
.article-body blockquote.verse{margin:1.6em auto;padding:.4em 0 .4em 1.2em;max-width:34em;
  border-left:3px solid var(--gold);color:var(--text)}
.article-body blockquote.verse p{text-indent:0;margin:.45em 0}
.article-body h2{font-size:1.25em;margin:1.6em 0 .6em;color:var(--ink)}
[data-theme="night"] .article-body h2{color:var(--gold)}
.article-body hr.scene{border:0;margin:2em 0}
.article-body hr.scene::after{content:"✦";display:block;text-align:center;color:var(--gold);font-size:14px}
figure.illus{margin:2em auto;text-align:center;max-width:640px;background:var(--card);
  border:1px solid var(--line);border-radius:8px;padding:14px;box-shadow:var(--shadow)}
figure.illus img{border-radius:3px}
figure.illus figcaption{font-size:13.5px;color:var(--muted);margin-top:10px;text-indent:0}
.fig-missing{color:var(--muted);font-size:14px;border:1px dashed var(--line);border-radius:6px;
  padding:12px;text-align:center;text-indent:0}
.table-wrap{overflow-x:auto;margin:1.4em 0}
table{border-collapse:collapse;width:100%;font-size:.92em}
th,td{border:1px solid var(--line);padding:8px 12px;text-align:left;vertical-align:top}
th{background:var(--cream);color:var(--ink);font-weight:600}
[data-theme="night"] th{background:#1d4258;color:var(--gold)}
td p{text-indent:0!important;margin:0}
.notes{margin:3em 0 1em;border-top:1px solid var(--gold);padding-top:6px}
.notes-title{text-align:center;font-size:17px;letter-spacing:.4em;color:var(--ink);margin:14px 0}
[data-theme="night"] .notes-title{color:var(--gold)}
.note{display:flex;gap:10px;margin:.7em 0;font-size:.92em;text-align:justify}
.note-num{color:var(--gold-d);font-family:var(--font-en);flex-shrink:0}
.note-body p{text-indent:0;margin:0}
.chap-progress{margin:26px 0 6px;font-size:13px;color:var(--muted)}
.chap-progress .bar{height:6px;background:var(--mist);border-radius:3px;overflow:hidden;margin-top:6px}
.chap-progress .bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--gold-d),var(--gold))}
.read-tools{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:16px;
  position:sticky;top:96px;box-shadow:var(--shadow)}
.tool-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:14px}
.tool-btn{display:flex;flex-direction:column;align-items:center;gap:4px;border:1px solid var(--line);
  background:var(--bg);border-radius:8px;padding:10px 4px;font-size:12.5px;color:var(--text);
  cursor:pointer;font-family:inherit}
.tool-btn:hover{border-color:var(--gold)}
.tool-btn svg{width:20px;height:20px;stroke:var(--teal);fill:none;stroke-width:1.8}
.tool-btn.on{border-color:var(--gold);background:rgba(200,169,106,.14)}
.tool-btn.on svg{stroke:var(--gold-d);fill:rgba(200,169,106,.35)}
.settings h3{font-size:14px;letter-spacing:.2em;color:var(--muted);margin:4px 0 10px;font-weight:400}
.set-row{display:flex;align-items:center;gap:8px;margin-bottom:10px;font-size:13.5px}
.set-row .lbl{width:38px;color:var(--muted);flex-shrink:0}
.seg{display:flex;gap:6px;flex:1}
.seg button{flex:1;border:1px solid var(--line);background:var(--bg);border-radius:6px;padding:6px 4px;
  font-size:13px;cursor:pointer;color:var(--text);font-family:inherit}
.seg button.on{border-color:var(--gold-d);background:rgba(200,169,106,.16);font-weight:600}
.theme-swatches{display:flex;gap:8px;flex:1}
.swatch{flex:1;border:2px solid var(--line);border-radius:6px;padding:8px 2px;font-size:12px;
  cursor:pointer;text-align:center;font-family:inherit}
.swatch.on{border-color:var(--gold-d)}
.swatch.sw-paper{background:#FAF6EF;color:#35322b}
.swatch.sw-eyecare{background:#F3E9D6;color:#3b342a}
.swatch.sw-night{background:#0F2A3A;color:#e7dfcb}
.cite-box{margin-top:14px;border-top:1px solid var(--line);padding-top:12px}
.cite-box h3{font-size:14px;letter-spacing:.2em;color:var(--muted);margin:0 0 8px;font-weight:400}
.cite-text{font-size:13px;color:var(--muted);background:var(--bg);border:1px solid var(--line);
  border-radius:6px;padding:10px;margin-bottom:8px;line-height:1.8}
.copy-btn{width:100%;border:1px solid var(--gold-d);background:transparent;color:var(--ink);
  border-radius:6px;padding:8px;font-size:14px;cursor:pointer;font-family:inherit}
[data-theme="night"] .copy-btn{color:var(--text)}
.copy-btn:hover{background:rgba(200,169,106,.14)}

/* ---------- 通用内容页 ---------- */
.prose{max-width:820px;margin:10px 0 50px}
.prose h1{font-size:32px;color:var(--ink);letter-spacing:.1em}
[data-theme="night"] .prose h1{color:var(--text)}
.prose h2{font-size:21px;color:var(--ink);margin-top:2em;letter-spacing:.12em}
[data-theme="night"] .prose h2{color:var(--gold)}
.prose p{text-align:justify}
.prose ul{padding-left:1.4em}
.prose li{margin:.5em 0}

/* ---------- 搜索 ---------- */
.search-page{max-width:820px;margin:20px 0 60px}
#search-input{width:100%;border:1px solid var(--gold-d);border-radius:10px;padding:13px 20px;
  font-size:17px;font-family:inherit;background:var(--card);color:var(--text);outline:none}
.search-hint{font-size:14px;color:var(--muted);margin:10px 0 20px}
.result{border-bottom:1px solid var(--line);padding:16px 4px}
.result h3{margin:0 0 4px;font-size:18px}
.result .url{font-size:12.5px;color:var(--muted);font-family:var(--font-en)}
.result .snip{font-size:14.5px;color:var(--text);margin:6px 0 0}
.result mark{background:rgba(200,169,106,.4);color:inherit}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .reader{grid-template-columns:230px minmax(0,1fr)}
  .read-tools{grid-column:1/-1;position:static}
  .tool-grid{grid-template-columns:repeat(4,1fr)}
  .book-detail{grid-template-columns:260px minmax(0,1fr)}
  .book-side-right{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:20px}
  .book-side-right .side-block{margin-bottom:0}
  .topic-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:820px){
  .main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--bg-soft);
    flex-direction:column;align-items:stretch;border-bottom:1px solid var(--line);padding:8px 18px 14px}
  .main-nav.open{display:flex}
  .nav-toggle-btn{display:block}
  .search-box{margin-left:auto}
  .search-box input{width:130px}
  .hero h1{font-size:44px}
  .book-detail{grid-template-columns:1fr}
  .book-side-right{grid-template-columns:1fr}
  .reader{grid-template-columns:1fr}
  .read-side{position:static}
  .chap-list{max-height:30vh}
  .topic-grid{grid-template-columns:1fr}
  .footer-in{grid-template-columns:1fr}
  .footer-quote{text-align:left}
  .toc-list{columns:1}
  .stats{flex-direction:column}
  .stat{border-right:0;border-bottom:1px solid var(--line)}
  .stat:last-child{border-bottom:0}
}