/* =========================================================
   THƯ VIỆN SỐ · XÃ AN NHƠN TÂY
   Token system
   Màu: --paper (giấy ấm), --ink (mực đậm), --teal (thương hiệu
        chung với bandoso), --gold (gáy sách/điểm nhấn ấm).
   Chữ: Literata (serif đọc sách) cho tiêu đề + mô tả sách,
        Be Vietnam Pro (sans) cho giao diện, Space Mono cho số liệu.
   Dấu ấn riêng: chồng sách xoè hình quạt dựng từ ảnh bìa sách thật
   — thư viện là sách, không phải con dấu hành chính.
   ========================================================= */
:root{
  --paper:#FBF7EE; --paper-2:#F1E9D8; --card:#FFFFFF;
  --ink:#20241F; --ink-soft:#5C6259; --ink-faint:#93998E;
  --line:rgba(32,36,31,.12); --line-2:rgba(32,36,31,.07);
  --teal:#116F68; --teal-deep:#0B534E; --teal-lt:#DCEEEC;
  --gold:#B9812A; --gold-deep:#8F631E; --gold-lt:#F2DFB6;
  --shadow-s:0 2px 10px -5px rgba(28,20,10,.22);
  --shadow-m:0 18px 40px -20px rgba(28,20,10,.35);
  --shadow-l:0 34px 70px -28px rgba(28,20,10,.48);
  --serif:"Literata",Georgia,serif;
  --sans:"Be Vietnam Pro",system-ui,sans-serif;
  --mono:"Space Mono",ui-monospace,monospace;
  --ease:cubic-bezier(.22,.75,.2,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--paper);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
::selection{background:var(--gold-lt);color:var(--ink)}

/* ================= TOPBAR ================= */
.topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:20px;padding:14px 26px;
  background:rgba(251,247,238,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{width:34px;height:34px;flex:none}
.brand-mark img{width:100%;height:100%;object-fit:contain}
.brand-tx{display:flex;flex-direction:column;line-height:1.15}
.brand-tx strong{font-family:var(--serif);font-size:16.5px;font-weight:700}
.brand-tx em{font-style:normal;font-size:10.5px;color:var(--teal-deep);font-weight:700;letter-spacing:.3px}
.topnav{display:flex;gap:6px;margin-left:auto}
.topnav-link{font-size:13.5px;font-weight:700;padding:8px 13px;border-radius:8px;color:var(--ink-soft)}
.topnav-link:hover{background:var(--paper-2);color:var(--ink)}
.icon-btn{display:none;width:36px;height:36px;border-radius:8px;font-size:16px}
.icon-btn:hover{background:var(--paper-2)}

/* ================= HERO ================= */
.hero{position:relative;overflow:hidden;padding:64px 0 58px}
.hero-glow{position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(46% 70% at 88% 12%,rgba(17,111,104,.14),transparent 62%),
    radial-gradient(40% 55% at 6% 96%,rgba(185,129,42,.14),transparent 60%),
    var(--paper);
}
.hero-in{position:relative;display:grid;grid-template-columns:1fr 420px;gap:40px;align-items:center}
.hero-copy{max-width:560px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:700;letter-spacing:.4px;
  color:var(--gold-deep);text-transform:uppercase;margin-bottom:16px}
.eyebrow::before{content:"";width:22px;height:1.5px;background:var(--gold)}
.hero-title{font-family:var(--serif);font-size:clamp(34px,4.6vw,52px);line-height:1.08;margin:0 0 18px;font-weight:700;letter-spacing:-.01em}
.hero-title em{font-style:italic;color:var(--teal-deep);font-weight:500}
.hero-sub{font-size:15.5px;line-height:1.65;color:var(--ink-soft);max-width:480px;margin:0 0 30px}

/* --- ô tìm kiếm --- */
.catalog-search{display:flex;align-items:stretch;gap:4px;background:var(--card);border-radius:12px;
  box-shadow:var(--shadow-m);max-width:480px;overflow:hidden;margin-bottom:32px;padding:5px 5px 5px 16px}
.catalog-search .search-ic{width:18px;height:18px;flex:none;align-self:center;color:var(--ink-faint)}
.catalog-search input{flex:1;border:0;outline:0;background:none;padding:13px 12px;font-size:14.5px;font-family:var(--sans);color:var(--ink)}
.catalog-search input::placeholder{color:var(--ink-faint)}
.catalog-search .btn{border-radius:8px}

.hero-stats{display:flex;gap:32px}
.stat b{display:block;font-family:var(--mono);font-size:23px;font-weight:700;color:var(--ink)}
.stat span{font-size:11px;color:var(--ink-faint);font-weight:600}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:12px 20px;border-radius:9px;
  font-size:13.5px;font-weight:700;border:1.5px solid transparent;color:var(--ink);background:var(--paper-2);transition:transform .15s,background .15s,color .15s,box-shadow .15s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-deep)}
.btn-gold{background:var(--gold);color:#fff}
.btn-gold:hover{background:var(--gold-deep)}
.btn-ghost{border-color:var(--line);background:transparent}
.btn-ghost:hover{border-color:var(--ink)}
.btn-lg{padding:14px 26px;font-size:14.5px}

/* --- chồng sách xoè quạt (dấu ấn riêng của trang) --- */
.hero-stack{position:relative;height:400px}
.hero-stack .hs-card{position:absolute;left:50%;top:50%;width:172px;aspect-ratio:3/4.35;object-fit:cover;
  border-radius:7px;background:var(--paper-2);box-shadow:0 20px 40px -16px rgba(28,20,10,.4),inset 0 0 0 1px rgba(0,0,0,.06);
  transition:transform .35s var(--ease),filter .35s var(--ease);cursor:pointer}
.hero-stack .hs-card:hover{filter:brightness(1.03)}
.hero-stack .hs-card:nth-child(1){transform:translate(-50%,-50%) translate(-128px,46px) rotate(-16deg);z-index:1;filter:brightness(.88)}
.hero-stack .hs-card:nth-child(2){transform:translate(-50%,-50%) translate(-70px,20px) rotate(-8deg);z-index:2;filter:brightness(.94)}
.hero-stack .hs-card:nth-child(3){transform:translate(-50%,-50%) translate(0,-10px) rotate(0deg) scale(1.06);z-index:4;box-shadow:0 30px 56px -18px rgba(28,20,10,.5),inset 0 0 0 1px rgba(0,0,0,.06)}
.hero-stack .hs-card:nth-child(4){transform:translate(-50%,-50%) translate(70px,20px) rotate(8deg);z-index:2;filter:brightness(.94)}
.hero-stack .hs-card:nth-child(5){transform:translate(-50%,-50%) translate(128px,46px) rotate(16deg);z-index:1;filter:brightness(.88)}
.hero-stack .hs-card:nth-child(1):hover{transform:translate(-50%,-50%) translate(-134px,38px) rotate(-16deg) translateY(-6px)}
.hero-stack .hs-card:nth-child(2):hover{transform:translate(-50%,-50%) translate(-74px,12px) rotate(-8deg) translateY(-6px)}
.hero-stack .hs-card:nth-child(3):hover{transform:translate(-50%,-50%) translate(0,-18px) rotate(0deg) scale(1.06)}
.hero-stack .hs-card:nth-child(4):hover{transform:translate(-50%,-50%) translate(74px,12px) rotate(8deg) translateY(-6px)}
.hero-stack .hs-card:nth-child(5):hover{transform:translate(-50%,-50%) translate(134px,38px) rotate(16deg) translateY(-6px)}

/* ================= KỆ SÁCH NỔI BẬT ================= */
.shelf-sec{padding:8px 0 44px}
.sec-head{display:flex;align-items:baseline;gap:12px;margin-bottom:16px}
.sec-title{font-family:var(--serif);font-size:22px;font-weight:700;margin:0}
.sec-sub{font-size:12.5px;color:var(--ink-faint);font-weight:600}
.shelf{display:flex;gap:18px;overflow-x:auto;padding:10px 4px 18px;scroll-snap-type:x proximity}
.shelf::-webkit-scrollbar{height:6px}
.shelf::-webkit-scrollbar-thumb{background:var(--line);border-radius:4px}
.shelf-loading{color:var(--ink-faint);font-size:13px;padding:20px 0}
.shelf-card{flex:none;width:148px;scroll-snap-align:start;cursor:pointer;transition:transform .2s var(--ease)}
.shelf-card:hover{transform:translateY(-5px)}
.shelf-cover{width:148px;height:210px;border-radius:6px;object-fit:cover;background:var(--paper-2);
  box-shadow:0 10px 22px -10px rgba(28,20,10,.4),inset 0 0 0 1px rgba(0,0,0,.06);position:relative}
.shelf-card .shelf-title{margin-top:9px;font-size:12.5px;font-weight:700;line-height:1.35;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ================= DUYỆT SÁCH ================= */
.browse-sec{padding:10px 0 60px;border-top:1px solid var(--line)}
.browse-grid{display:grid;grid-template-columns:200px 1fr;gap:36px;padding-top:36px}
.cat-rail h3{font-size:11px;text-transform:uppercase;letter-spacing:.5px;color:var(--ink-faint);margin:0 0 12px}
.cat-list{display:flex;flex-direction:column;gap:2px}
.cat-item{display:flex;justify-content:space-between;gap:8px;padding:8px 10px;border-radius:8px;font-size:13.5px;font-weight:600;color:var(--ink-soft)}
.cat-item:hover{background:var(--paper-2)}
.cat-item.active{background:var(--teal);color:#fff}
.cat-item .n{font-family:var(--mono);font-size:11px;opacity:.7}

.book-col-head{display:flex;align-items:baseline;gap:10px;margin-bottom:16px}
.book-count{font-size:12.5px;color:var(--ink-faint);font-family:var(--mono)}
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:24px 18px}
.book-card{cursor:pointer}
.book-cover-wrap{position:relative;margin-bottom:10px}
.book-cover{width:100%;aspect-ratio:3/4.35;object-fit:cover;border-radius:6px;background:var(--paper-2);
  box-shadow:0 8px 18px -10px rgba(28,20,10,.32),inset 0 0 0 1px rgba(0,0,0,.06);transition:box-shadow .2s,transform .2s}
.book-card:hover .book-cover{transform:translateY(-3px);box-shadow:0 16px 28px -12px rgba(28,20,10,.42),inset 0 0 0 1px rgba(0,0,0,.06)}
.featured-badge{position:absolute;top:8px;left:8px;font-family:var(--sans);font-size:10px;font-weight:800;
  letter-spacing:.2px;color:#fff;background:var(--gold);padding:3px 9px;border-radius:20px;box-shadow:var(--shadow-s)}
.book-title{font-size:13px;font-weight:700;line-height:1.35;margin:0 0 3px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.book-meta{font-size:11px;color:var(--ink-faint)}

.pager{display:flex;justify-content:center;gap:10px;margin-top:34px}

/* ================= TRANG CHI TIẾT SÁCH ================= */
.book-detail{padding:40px 24px 70px;display:grid;grid-template-columns:280px 1fr;gap:46px}
.back-link{grid-column:1/-1;font-size:13px;font-weight:700;color:var(--ink-soft);margin-bottom:4px;display:inline-flex;align-items:center;gap:6px}
.back-link:hover{color:var(--teal-deep)}
.detail-cover-wrap{position:sticky;top:90px;align-self:start}
.detail-cover{width:100%;aspect-ratio:3/4.35;object-fit:cover;border-radius:8px;background:var(--paper-2);
  box-shadow:0 24px 50px -22px rgba(28,20,10,.42),inset 0 0 0 1px rgba(0,0,0,.07)}
.detail-actions{display:flex;flex-direction:column;gap:10px;margin-top:18px}
.detail-body .cat-tags{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:14px}
.cat-tag{font-size:11px;font-weight:700;color:var(--teal-deep);background:var(--teal-lt);padding:4px 11px;border-radius:20px}
.detail-title{font-family:var(--serif);font-size:clamp(26px,4vw,36px);line-height:1.12;margin:0 0 10px;font-weight:700}
.detail-author{font-size:14px;color:var(--ink-soft);margin-bottom:18px}
.detail-stats{display:flex;gap:20px;font-size:12.5px;color:var(--ink-faint);margin-bottom:24px;font-family:var(--mono)}
.detail-desc{font-family:var(--serif);font-size:16px;line-height:1.75;color:var(--ink);max-width:62ch;white-space:pre-line}
.detail-source{margin-top:26px;font-size:12px;color:var(--ink-faint)}
.detail-source a{color:var(--teal-deep);font-weight:700}

/* ================= FOOTER ================= */
.site-footer{border-top:1px solid var(--line);padding:22px 0;margin-top:20px}
.footer-in{display:flex;gap:10px;justify-content:center;font-size:12.5px;color:var(--ink-faint);font-weight:600}
.footer-in .dot{opacity:.5}

.view[hidden]{display:none}

/* ================= SÁCH LẬT 3D (reader overlay) ================= */
.reader-overlay{position:fixed;inset:0;z-index:200;display:flex;flex-direction:column;
  background:radial-gradient(120% 100% at 50% 0%,#1B2622 0%,#101613 70%)}
.reader-overlay[hidden]{display:none}
.reader-top{display:flex;align-items:center;gap:14px;padding:14px 20px;color:#EDEAE0;flex:none}
.reader-icon-btn{width:38px;height:38px;border-radius:9px;display:grid;place-items:center;font-size:17px;
  background:rgba(255,255,255,.08);color:#EDEAE0;flex:none;transition:background .15s}
.reader-icon-btn:hover{background:rgba(255,255,255,.16)}
.reader-title{font-family:var(--serif);font-size:15px;font-weight:600;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.reader-page-indicator{font-family:var(--mono);font-size:12px;color:rgba(237,234,224,.6);flex:none}
.reader-stage{position:relative;flex:1;display:flex;align-items:center;justify-content:center;padding:10px 70px;min-height:0}
.flipbook-container{width:min(90vw,920px);height:min(78vh,720px)}
.reader-nav{position:absolute;top:50%;transform:translateY(-50%);width:46px;height:46px;border-radius:50%;
  display:grid;place-items:center;font-size:24px;color:#EDEAE0;background:rgba(255,255,255,.08);transition:background .15s}
.reader-nav:hover{background:rgba(255,255,255,.18)}
.reader-nav.prev{left:16px}
.reader-nav.next{right:16px}
.reader-progress{flex:none;padding:0 20px 26px;display:flex;flex-direction:column;align-items:center;gap:10px}
.reader-progress[hidden]{display:none}
.reader-progress-bar{width:min(90vw,420px);height:4px;border-radius:4px;background:rgba(255,255,255,.14);overflow:hidden}
.reader-progress-fill{height:100%;width:0%;background:var(--gold);transition:width .2s}
.reader-progress-text{font-size:12.5px;color:rgba(237,234,224,.7)}

/* ================= RESPONSIVE ================= */
@media (max-width:960px){
  .hero-in{grid-template-columns:1fr}
  .hero-stack{height:280px;order:-1}
  .hero-stack .hs-card{width:128px}
}
@media (max-width:860px){
  .browse-grid{grid-template-columns:1fr}
  .cat-rail{order:2}
  .cat-list{flex-direction:row;flex-wrap:wrap}
  .book-detail{grid-template-columns:1fr}
  .detail-cover-wrap{position:static;max-width:260px;margin:0 auto}
  .detail-actions{flex-direction:row}
  .detail-actions .btn{flex:1}
}
@media (max-width:640px){
  .topnav{display:none}
  .icon-btn{display:grid;place-items:center;margin-left:auto}
  .catalog-search{max-width:none}
  .book-detail{padding:32px 18px 60px}
  .detail-cover-wrap{max-width:220px}
  .detail-actions{flex-direction:column}
  .btn-lg{padding:12px 20px;font-size:14px}
  .reader-stage{padding:10px 50px}
  .reader-nav{width:38px;height:38px;font-size:20px}
  .reader-nav.prev{left:6px}
  .reader-nav.next{right:6px}
  .reader-title{font-size:13px}
}