/* Gác Sách Xưa — giao diện "Cổ điển", theo themes/Main.dc.html */
:root{
  --ink:#2a1f16; --paper:#efe5cf; --paper-2:#f6eedb; --paper-3:#fffaf0;
  --wine:#6e1f1c; --wine-dark:#3a1512; --ochre:#6f5320; --muted:#5b4a36; --body-2:#3d2f20;
  --shadow:#c9b88f; --gold:#e0c98f; --cream:#e9dcc0; --photo:#d8c9a3;
  --serif-d:'Playfair Display',Georgia,serif; --serif:'Lora',Georgia,serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--serif);font-size:17px;line-height:1.6}
img{max-width:100%;height:auto}
a{color:var(--wine)}a:hover{color:var(--ink)}
input,select,textarea,button{font-family:inherit;color:inherit}
input:focus,select:focus,textarea:focus,button:focus-visible,a:focus-visible{outline:2px solid var(--wine);outline-offset:2px}
.sr-only,.hp{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-9999px;top:0;background:var(--ink);color:var(--paper);padding:8px 14px;z-index:10}
.skip:focus{left:8px;top:8px}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
.wrap.narrow{max-width:820px}
.center{text-align:center}
.muted{color:var(--muted)}

/* top strip + masthead */
.strip{background:var(--ink);color:var(--paper);font-size:13px;letter-spacing:.14em;text-transform:uppercase;text-align:center;padding:9px 24px}
.masthead-wrap{padding-top:36px}
.masthead{border-top:4px double var(--ink);border-bottom:4px double var(--ink);padding:26px 0 22px;text-align:center}
.brand{display:inline-flex;flex-direction:column;align-items:center;gap:14px;font-family:var(--serif-d);font-size:clamp(40px,8.4vw,76px);line-height:1;font-weight:900;letter-spacing:.06em;color:var(--ink);text-decoration:none}
.brand:hover{color:var(--ink)}
.brand-mark{display:flex;align-items:center;gap:18px;color:var(--wine)}
.brand-mark::before,.brand-mark::after{content:"";width:clamp(40px,10vw,90px);border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);height:3px}
.brand-mark svg{width:clamp(52px,8vw,76px);height:auto}
.brand-name{display:block;max-width:100%;overflow-wrap:anywhere}
.tagline{margin:12px 0 0;font-style:italic;font-size:clamp(16px,2.4vw,19px);color:var(--ochre)}
.nav{display:flex;flex-wrap:wrap;justify-content:center;gap:12px 48px;padding:14px 0;border-bottom:1px solid var(--ink)}
.nav a{text-decoration:none;color:var(--ink);text-align:center;line-height:1.25}
.nav .vi{display:block;font-family:var(--serif-d);font-weight:700;font-size:18px}
.nav .en{display:block;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--ochre)}
.nav a[aria-current] .vi{color:var(--wine);text-decoration:underline;text-underline-offset:5px;text-decoration-thickness:1px}
.crumbs{padding:20px 0 0;font-size:14px;color:var(--muted)}
.crumbs a{color:var(--muted)}

/* panels (double-ruled boxes) */
.panel{border:1px solid var(--ink);padding:6px}
.panel-in{border:1px solid var(--ink);padding:30px 32px;background:var(--paper-2)}
.eyebrow{font-size:13px;letter-spacing:.2em;text-transform:uppercase;color:var(--ochre)}
.eyebrow.light{color:var(--gold);letter-spacing:.24em}
.btn{display:inline-flex;align-items:center;justify-content:center;height:52px;padding:0 32px;border:1px solid var(--wine);background:var(--wine);color:var(--paper-3);font-family:var(--serif-d);font-weight:700;font-size:17px;letter-spacing:.06em;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--wine-dark);color:var(--paper-3)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink);height:48px;padding:0 24px;font-size:16px}
.btn-ghost:hover{background:var(--ink);color:var(--paper)}
.btn-sm{height:38px;padding:0 16px;font-size:15px}

/* search */
.sec-search{padding:56px 0 48px;display:flex;justify-content:center}
.sec-search.slim{padding:28px 0 32px}
.search-panel{width:100%;max-width:820px}
.search-panel .panel-in{padding:36px 40px 32px}
.search-title{margin:8px 0 22px;font-family:var(--serif-d);font-weight:700;font-size:clamp(28px,4.4vw,38px);line-height:1.2}
.sec-search.slim .search-title{font-size:28px;margin-bottom:16px}
.search-form{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.search-form input{flex:1 1 380px;min-width:0;height:52px;padding:0 18px;border:1px solid var(--ink);background:var(--paper-3);font-size:17px}
.hint{margin:16px 0 0;font-style:italic;font-size:15px;color:var(--muted)}
.filters{margin-top:18px;display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:center;font-size:15px}
.filters span{color:var(--muted)}.filters a{color:var(--ink)}

/* sections */
.sec{padding-bottom:56px}
.sec-pad{padding-top:40px;padding-bottom:64px}
.rule-title{display:flex;align-items:center;gap:20px;margin-bottom:28px}
.rule-title span{flex:1;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);height:5px}
.rule-title h2{margin:0;font-family:var(--serif-d);font-weight:700;font-size:30px;letter-spacing:.04em;text-align:center}
.sec-head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:8px;margin-bottom:24px;border-bottom:1px solid var(--ink);padding-bottom:10px}
.sec-head h2,.sec-head h1{margin:0;font-family:var(--serif-d);font-weight:700;font-size:30px}
.sec-head>a{font-style:italic}
.h-page{font-family:var(--serif-d);font-weight:700;font-size:clamp(26px,4vw,34px);line-height:1.2;margin:16px 0 12px}
.h-page.big{font-size:clamp(32px,5vw,46px)}
.h-sub{font-family:var(--serif-d);font-size:22px;margin:28px 0 6px}
.h-sub a{color:var(--ink);text-decoration:none}
.en-sub{font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--ochre)}
.page-head{max-width:760px;margin:0 auto 40px}
.lead{font-size:18px;color:var(--body-2);font-style:italic}
.empty{padding:28px;border:1px dashed var(--ink);background:var(--paper-2);text-align:center}

/* categories */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr));gap:1px;background:var(--ink);border:1px solid var(--ink)}
.cat{text-decoration:none;color:var(--ink);padding:24px 24px 28px;display:block;background:var(--paper-2)}
.cat-top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:10px}
.cat .emblem{transition:transform .25s,color .25s}
.cat:hover .emblem{transform:rotate(-6deg) scale(1.06);color:var(--wine)}
.cat:hover{background:var(--paper-3);color:var(--ink)}
.cat .num{font-family:var(--serif-d);font-size:15px;color:var(--ochre);letter-spacing:.2em}
.cat .name{font-family:var(--serif-d);font-weight:700;font-size:24px;margin:6px 0;line-height:1.25;overflow-wrap:break-word}
/* huy hiệu chuyên mục: vòng tròn kép như con dấu thư viện */
.emblem{flex:none;display:inline-flex;align-items:center;justify-content:center;border-radius:50%;color:var(--ochre);background:var(--paper-3);border:1px solid currentColor;box-shadow:0 0 0 3px var(--paper-3),0 0 0 4px var(--shadow)}
.emblem svg{width:64%;height:64%}
.emblem.has-img{overflow:hidden;background:var(--photo)}
.emblem.has-img img{width:100%;height:100%;object-fit:cover;display:block;filter:sepia(.25)}
.emblem-sm{width:44px;height:44px}.emblem-md{width:76px;height:76px}.emblem-lg{width:104px;height:104px;margin-bottom:18px;color:var(--wine)}
.col-item{display:flex;gap:16px;align-items:flex-start}.col-item .emblem{margin-top:6px}
.cat .sub{font-size:15px;color:var(--muted)}
.col-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(320px,100%),1fr));gap:8px 40px;margin-top:24px}

/* book cards */
.books-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(220px,100%),1fr));gap:32px}
.book-card .cover{display:block;aspect-ratio:3/4;border:1px solid var(--ink);box-shadow:6px 6px 0 var(--shadow);overflow:hidden;background:var(--photo)}
.book-card .cover img{display:block;width:100%;height:100%;object-fit:cover;transition:transform .3s}
.book-card .cover:hover img{transform:scale(1.03)}
.book-title{margin:16px 0 2px;font-family:var(--serif-d);font-size:20px;line-height:1.3;overflow-wrap:break-word}
.book-title a{color:var(--ink);text-decoration:none}
.book-title a:hover{color:var(--wine)}
.book-card .meta{font-size:15px;color:var(--muted)}
.book-card .source{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--ochre);margin-top:6px}
.sortbar{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;margin:-8px 0 24px;font-size:15px}
.sortbar select{height:38px;border:1px solid var(--ink);background:var(--paper-3);padding:0 10px;font-size:15px}
.pager{display:flex;justify-content:center;gap:24px;margin-top:40px;font-size:16px}
.index-list{columns:3 220px;padding-left:20px;margin:0}
.index-list li{margin-bottom:6px;break-inside:avoid}

/* ex libris */
.exlibris{background:var(--wine-dark);color:var(--paper);padding:64px 0}
.ex-head{margin-bottom:36px}
.ex-head h2{margin:6px 0 10px;font-family:var(--serif-d);font-weight:700;font-size:36px}
.ex-head p{margin:0 auto;max-width:620px;font-style:italic;color:var(--cream)}
.ex-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(300px,100%),1fr));gap:28px}
.ex-card{background:var(--paper);color:var(--ink);padding:10px}
.ex-grid.on-light .ex-card{border:1px solid var(--ink);box-shadow:6px 6px 0 var(--shadow)}
.ex-photo{aspect-ratio:4/3;background:var(--photo);border:1px solid var(--ink);display:flex;align-items:center;justify-content:center;overflow:hidden;font-size:13px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);text-align:center;text-decoration:none}
.ex-photo img{width:100%;height:100%;object-fit:cover;display:block}
.ex-body{padding:16px 12px 12px}
.ex-body h3{margin:0;font-family:var(--serif-d);font-size:22px;line-height:1.3}
.ex-body h3 a{color:var(--ink);text-decoration:none}
.ex-by{font-size:14px;letter-spacing:.08em;color:var(--ochre);margin:2px 0 8px}
.ex-body p{margin:0;font-size:15px;color:var(--body-2)}
.more-light{margin:32px 0 0;color:var(--cream)}
.more-light a{color:var(--gold)}
.more-light a:hover{color:#fff}
.gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(260px,100%),1fr));gap:16px;margin:24px 0}
.gallery figure{margin:0;border:1px solid var(--ink);background:var(--paper-2);padding:6px}
.gallery img{display:block;width:100%;height:auto}

/* forms */
.two-col{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(420px,100%),1fr));gap:40px}
.stack{display:flex;flex-direction:column;gap:16px}
.stack-sm{display:flex;flex-direction:column;gap:14px}
.stack-lg{display:flex;flex-direction:column;gap:24px}
.h-form{margin:4px 0 6px;font-family:var(--serif-d);font-weight:700;font-size:28px;line-height:1.25}
.stack .muted,.stack p{margin:0;font-size:15px}
.field label{font-size:14px;letter-spacing:.06em}
.field input,.field textarea,.inline-form input{display:block;width:100%;margin-top:4px;padding:0 14px;height:46px;border:1px solid var(--ink);background:var(--paper-3);font-size:16px}
.field textarea{height:auto;padding:10px 14px;resize:vertical}
.field input.file{height:auto;padding:10px 14px;border-style:dashed;font-size:15px}
.stack .btn{height:50px}
.inline-form{display:flex;flex-wrap:wrap;gap:12px}
.inline-form input{flex:1 1 220px;min-width:0;width:auto;height:48px;margin:0}
.badges{display:flex;flex-wrap:wrap;gap:10px;font-size:14px}
.badges span{border:1px solid var(--ink);padding:3px 12px}
.about-mini{padding:4px 4px 0}
.about-mini h2{margin:0 0 8px;font-family:var(--serif-d);font-weight:700;font-size:24px}
.about-mini p{margin:0 0 8px;font-size:16px;color:var(--body-2)}
.alert{margin:0;border:1px solid var(--wine);background:#f7e1dc;color:var(--wine-dark);padding:10px 14px}
.code-big{font-family:var(--serif-d);font-size:40px;font-weight:900;letter-spacing:.12em;margin:8px 0 0;user-select:all}
.status{display:inline-block;border:1px solid currentColor;padding:2px 12px;font-weight:600}
.st-pending{color:var(--ochre)}.st-approved{color:#2f5a2a}.st-rejected{color:var(--wine)}

/* book detail */
.book-detail{display:grid;grid-template-columns:minmax(0,320px) minmax(0,1fr);gap:48px;padding:24px 0 48px;align-items:start}
.bd-cover{border:1px solid var(--ink);box-shadow:8px 8px 0 var(--shadow);background:var(--photo)}
.bd-cover img{display:block;width:100%;height:auto}
.bd-info .h-page{margin-top:6px}
.meta-list{display:grid;grid-template-columns:max-content 1fr;gap:6px 20px;margin:20px 0;padding:16px 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);font-size:16px}
.meta-list dt{color:var(--ochre);font-size:13px;letter-spacing:.12em;text-transform:uppercase;padding-top:3px}
.meta-list dd{margin:0}
.prose p{margin:0 0 1em}
.prose h2{font-family:var(--serif-d);font-size:26px;margin:36px 0 10px}

/* reader */
.reader-sec{padding-bottom:56px;scroll-margin-top:12px}
.reader{border:1px solid var(--ink);background:var(--ink);display:flex;flex-direction:column}
.reader-bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 16px;padding:8px 10px;background:var(--ink);color:var(--paper);font-size:15px}
.reader-bar button,.reader-bar input{height:36px;border:1px solid rgba(239,229,207,.4);background:transparent;color:var(--paper);padding:0 12px;cursor:pointer;font-size:15px}
.reader-bar button:hover{background:rgba(239,229,207,.12)}
.reader-bar button[aria-selected=true]{background:var(--paper);color:var(--ink)}
.reader-bar button:disabled{opacity:.4;cursor:default}
.reader-bar input{width:64px;text-align:center;cursor:text}
.reader-tabs,.reader-nav,.reader-tools{display:flex;align-items:center;gap:6px}
.rd-total{opacity:.8}
.reader-stage{position:relative;height:min(82vh,1100px);background:#1d1610}
.reader-view{position:absolute;inset:0}
.reader-view.pdf{overflow:auto;text-align:center;padding:16px 0}
.reader-view.pdf canvas{display:block;margin:0 auto 16px;background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.4);max-width:none}
.reader-msg{position:absolute;inset:auto 16px 16px 16px;background:var(--paper);color:var(--ink);border:1px solid var(--ink);padding:12px 16px;font-size:15px}
.reader:fullscreen{width:100vw;height:100vh;border:0}
.reader:fullscreen .reader-stage{height:auto;flex:1}
.reader-credit{font-size:14px;color:var(--muted);margin-top:10px}
.reader-noscript{color:var(--paper);padding:16px}

/* footer */
.footer{background:var(--ink);color:var(--cream);padding:36px 0 20px;font-size:14px;line-height:1.7}
.footer-in{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px 48px}
.footer-in>div{flex:1 1 320px}
.footer strong{font-family:var(--serif-d);font-size:18px;color:var(--paper)}
.footer a{color:var(--gold)}
.footer-base{display:flex;align-items:center;gap:10px;margin-top:24px;padding-top:14px;border-top:1px solid rgba(233,220,192,.2);font-size:13px;opacity:.75}

@media (max-width:760px){
  .wrap{padding:0 16px}
  .masthead-wrap{padding-top:20px}
  .nav{gap:10px 22px}
  .nav .vi{font-size:16px}
  .panel-in,.search-panel .panel-in{padding:24px 18px}
  .book-detail{grid-template-columns:1fr;gap:28px}
  .bd-cover{max-width:260px}
  .books-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
  .book-title{font-size:17px}
  .reader-stage{height:75vh}
  .reader-bar{justify-content:center}
  .rule-title h2,.sec-head h2,.sec-head h1{font-size:24px}
}
.linkish{background:none;border:0;padding:0;color:var(--wine);text-decoration:underline;cursor:pointer;font:inherit}
.reader.pseudo-full{position:fixed;inset:0;z-index:100}
.reader.pseudo-full .reader-stage{height:auto;flex:1}