/* Tủ sách Lê Văn Cương — dùng chung cho site/sach/*.html (sinh bởi _tools/sach_gen.py) */
:root{
  --ink:#0b0e16; --ink-2:#111624; --ink-3:#06080f;
  --paper:#f2f3f6; --paper-2:#e9ebf0; --line:rgba(18,22,34,.12);
  --brown:#1a1e28; --dim:#5b6070; --ivory:#f0f2f7; --ivory-dim:#a8adbc;
  --gold:#c9a15c; --gold-b:#e2bd7c; --gold-d:#8f6d33;
  --display:'Space Grotesk','Segoe UI',sans-serif; --body:'Jost',-apple-system,'Segoe UI',sans-serif; --mono:'Space Mono','Courier New',monospace;
  --ease:cubic-bezier(.19,1,.22,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--brown);font-family:var(--body);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit}
.wrap{width:min(1180px,100%);margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--display);line-height:1.15;margin:0}
em{font-style:normal;color:var(--gold-b)}
.eyebrow{font-family:var(--mono);font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;color:var(--gold);margin:0 0 14px}

.topbar{position:sticky;top:0;z-index:20;background:rgba(6,8,15,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(226,189,124,.18)}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px}
.brand{text-decoration:none;display:flex;flex-direction:column;line-height:1.15}
.brand .name{font-family:var(--display);font-weight:700;color:var(--ivory);font-size:1.02rem}
.brand .name b{color:var(--gold-b)}
.brand .sub{font-family:var(--mono);font-size:.6rem;letter-spacing:.16em;text-transform:uppercase;color:var(--ivory-dim)}
.topbar nav{display:flex;align-items:center;gap:22px}
.topbar nav a{text-decoration:none;color:var(--ivory-dim);font-size:.92rem}
.topbar nav a:hover{color:var(--ivory)}
.btn-gold,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;text-align:center;gap:8px;text-decoration:none;font-weight:700;font-size:.92rem;padding:12px 20px;border-radius:3px;line-height:1.3;transition:transform .25s var(--ease),box-shadow .25s var(--ease)}
.btn-gold{background:linear-gradient(180deg,var(--gold-b),var(--gold));color:var(--ink-3)!important}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 14px 30px -14px rgba(226,189,124,.7)}
.btn-gold.big{padding:16px 26px;font-size:1rem}
.btn-ghost{border:1px solid rgba(226,189,124,.5);color:var(--gold-b)}
.btn-ghost:hover{background:rgba(226,189,124,.08)}
.btn-ghost.dark{color:var(--gold-d);border-color:rgba(143,109,51,.5);margin-top:28px}
.topbar nav .btn-gold{padding:9px 14px;font-size:.84rem}
@media (max-width:760px){.topbar nav a:not(.btn-gold){display:none}.topbar nav .btn-gold{font-size:.74rem;padding:8px 10px}}

/* thư viện */
.lib-hero{background:radial-gradient(90% 120% at 80% 0%,rgba(226,189,124,.14),transparent 60%),linear-gradient(180deg,var(--ink-3),var(--ink));color:var(--ivory);padding:clamp(56px,8vw,96px) 0 48px}
.lib-hero h1{font-size:clamp(2rem,4.6vw,3.3rem);max-width:20ch}
.lede{color:var(--ivory-dim);max-width:62ch;font-size:1.05rem;margin:18px 0 0}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.chips a{text-decoration:none;font-size:.86rem;padding:8px 14px;border-radius:20px;border:1px solid rgba(226,189,124,.35);color:var(--gold-b)}
.chips a:hover{background:rgba(226,189,124,.1)}
.lib-group{padding:18px 0 10px}
.lib-group:first-of-type{padding-top:40px}
.shelf-label{display:flex;align-items:center;gap:14px;margin:34px 0 22px;font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--gold-d)}
.shelf-label::after{content:'';flex:1;height:1px;background:linear-gradient(90deg,rgba(143,109,51,.45),transparent)}
.shelf-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:28px 22px}
@media (max-width:1100px){.shelf-grid{grid-template-columns:repeat(4,1fr)}}
@media (max-width:820px){.shelf-grid{grid-template-columns:repeat(3,1fr)}}
@media (max-width:560px){.shelf-grid{grid-template-columns:repeat(2,1fr);gap:24px 14px}}
.bk{display:flex;flex-direction:column;gap:9px;text-decoration:none;color:inherit}
.bk-cover{position:relative;aspect-ratio:48/70;border-radius:2px 6px 6px 2px;overflow:hidden;background:#07090f;box-shadow:0 18px 40px -18px rgba(0,0,0,.6),inset 6px 0 10px -6px rgba(0,0,0,.6);transition:transform .35s var(--ease),box-shadow .35s var(--ease)}
.bk-cover::before{content:'';position:absolute;left:0;top:0;bottom:0;width:7px;background:linear-gradient(90deg,rgba(0,0,0,.45),rgba(255,255,255,.1),rgba(0,0,0,0));z-index:3}
.bk:hover .bk-cover{transform:translateY(-6px) rotate(-1deg);box-shadow:0 28px 50px -18px rgba(0,0,0,.7)}
.bk-cover img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.bk-cover .ov{position:absolute;inset:0;z-index:2;display:flex;flex-direction:column;justify-content:space-between;padding:16px 14px 14px;background:linear-gradient(180deg,rgba(5,7,12,.82) 0%,rgba(5,7,12,.15) 38%,rgba(5,7,12,.2) 62%,rgba(5,7,12,.88) 100%);border:1px solid rgba(226,189,124,.28);border-radius:inherit}
.bk-cover .kicker{font-family:var(--mono);font-size:.52rem;letter-spacing:.16em;text-transform:uppercase;color:var(--gold-b)}
.bk-cover .ttl{font-family:var(--display);font-weight:700;font-size:clamp(.95rem,1.35vw,1.2rem);line-height:1.15;color:#f6e3bd;text-transform:uppercase;margin-top:6px}
.bk-cover .au{font-family:var(--mono);font-size:.55rem;letter-spacing:.2em;text-transform:uppercase;color:var(--gold)}
.bk-tag{align-self:flex-start;font-family:var(--mono);font-size:.62rem;letter-spacing:.05em;padding:4px 10px;border-radius:20px;background:linear-gradient(180deg,var(--gold-b),var(--gold));color:var(--ink-3);font-weight:700}
.bk h3{font-size:.98rem;line-height:1.3}
.bk p{margin:0;font-size:.84rem;color:var(--dim);line-height:1.45}
.bk .go{font-size:.82rem;font-weight:600;color:var(--gold-d)}

/* trang đọc */
.book-head{background:radial-gradient(80% 120% at 85% 0%,rgba(226,189,124,.16),transparent 60%),linear-gradient(180deg,var(--ink-3),var(--ink));color:var(--ivory);padding:clamp(36px,6vw,64px) 0}
.book-head .wrap{display:grid;grid-template-columns:220px 1fr;gap:clamp(24px,4vw,52px);align-items:center}
.bh-cover .bk-cover{box-shadow:0 30px 60px -20px rgba(0,0,0,.85)}
.book-head h1{font-size:clamp(1.8rem,4vw,2.8rem)}
.bh-sub{color:var(--gold-b);font-size:1.08rem;margin:10px 0 0}
.bh-desc{color:var(--ivory-dim);margin:14px 0 0;max-width:60ch}
.bh-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.share{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:22px;font-size:.86rem;color:var(--ivory-dim)}
.share button,.share a{font:inherit;font-size:.84rem;cursor:pointer;background:rgba(255,255,255,.06);border:1px solid rgba(226,189,124,.3);color:var(--ivory);padding:7px 12px;border-radius:20px;text-decoration:none}
.share button:hover,.share a:hover{border-color:var(--gold-b)}
.share-note{width:100%;font-size:.78rem}
@media (max-width:640px){.book-head .wrap{grid-template-columns:1fr}.bh-cover{max-width:180px}}
.reader{background:var(--ink-2);padding:28px 0 22px}
.frame{position:relative;width:100%;height:min(86vh,900px);min-height:520px;border:1px solid rgba(226,189,124,.25);border-radius:4px;overflow:hidden;background:#000}
.frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.hint{color:var(--ivory-dim);font-size:.84rem;margin:12px 0 0;text-align:center}
.next{background:linear-gradient(135deg,rgba(226,189,124,.14),rgba(201,161,92,.04)),var(--ink);color:var(--ivory);padding:clamp(40px,6vw,64px) 0;border-top:1px solid rgba(226,189,124,.2)}
.next .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px}
.next h2{font-size:clamp(1.4rem,3vw,2rem);max-width:24ch}
.next p{color:var(--ivory-dim);max-width:56ch;margin:12px 0 0}
.next-cta{display:flex;flex-direction:column;gap:12px}
.more{padding:20px 0 64px}
.foot{background:var(--ink-3);color:var(--ivory-dim);font-size:.84rem;padding:26px 0}
.foot .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}
.foot a{color:var(--gold-b);text-decoration:none}