:root{--ink:#24313b;--muted:#64727d;--brand:#236b83;--brand2:#e9f3f5;--paper:#fff;--line:#dce5e8;--accent:#d5a64b}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fbfcfc;color:var(--ink);font-family:Arial,Helvetica,sans-serif;line-height:1.65}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.wrap{width:min(1120px,92%);margin:auto}
header{background:#fff;border-bottom:1px solid var(--line)}.top{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:22px 0;flex-wrap:wrap}
.brand{font-weight:800;letter-spacing:.12em;font-size:1.55rem;color:var(--brand)}.brand small{display:block;font-size:.67rem;letter-spacing:.28em;color:var(--muted);font-weight:600;text-align:center}
nav{display:flex;gap:18px;flex-wrap:wrap;font-size:.94rem}.languages{display:flex;gap:8px;flex-wrap:wrap;padding:0 0 14px}.languages a{font-size:.78rem;border:1px solid var(--line);padding:3px 8px;border-radius:20px}
.hero{padding:64px 0 56px;background:linear-gradient(135deg,#edf6f7,#fff 65%);text-align:center}.eyebrow{text-transform:uppercase;letter-spacing:.18em;color:var(--brand);font-size:.78rem;font-weight:700}
h1{font-size:clamp(2rem,5vw,3.5rem);line-height:1.12;margin:12px 0;color:#1d3945}h2{font-size:1.65rem;margin:0 0 12px}h3{margin:.25rem 0}.hero p{max-width:760px;margin:18px auto;color:var(--muted);font-size:1.12rem}
.btn{display:inline-block;background:var(--brand);color:#fff;padding:11px 19px;border-radius:5px;font-weight:700;margin:8px 4px}.btn.secondary{background:#fff;color:var(--brand);border:1px solid var(--brand)}
section{padding:42px 0}.section-intro{color:var(--muted);max-width:760px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:9px;overflow:hidden}.cover{aspect-ratio:3/4;background:linear-gradient(145deg,#f0f5f5,#e2edef);display:flex;align-items:center;justify-content:center;text-align:center;padding:18px;color:#71818a;font-size:.9rem;border-bottom:1px solid var(--line)}
.cover img{width:100%;height:100%;object-fit:contain}.cardbody{padding:16px}.cardbody p{color:var(--muted);font-size:.92rem}.number{font-size:.75rem;color:var(--brand);font-weight:700;letter-spacing:.08em}
.notice{background:var(--brand2);border-left:4px solid var(--brand);padding:16px 18px;border-radius:4px}.lang-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:10px}.lang-grid a{background:#fff;border:1px solid var(--line);padding:12px;border-radius:6px}
.book-layout{display:grid;grid-template-columns:minmax(220px,340px) 1fr;gap:34px;align-items:start}.book-cover{min-height:400px}.book-cover .cover{min-height:400px;border:1px solid var(--line);border-radius:8px}
footer{background:#1e3038;color:#dce6e9;padding:32px 0;margin-top:30px}footer a{color:#fff}.footlinks{display:flex;gap:18px;flex-wrap:wrap;font-size:.9rem}
.small{font-size:.85rem;color:var(--muted)}.breadcrumbs{font-size:.85rem;color:var(--muted);padding-top:22px}
@media(max-width:650px){.book-layout{grid-template-columns:1fr}.top{align-items:flex-start}.hero{padding:44px 0}}

/* Book detail: front and back cover previews */
.book-cover .back-cover{margin-top:14px;min-height:260px;aspect-ratio:3/4}
.book-cover .back-cover img{width:100%;height:100%;object-fit:contain}

/* Interior preview gallery */
.interior-preview {
  margin: 2.5rem 0 1rem;
  padding: 1.5rem;
  background: #f6f8f8;
  border: 1px solid #dce4e6;
  border-radius: 14px;
}
.interior-preview h2 {
  margin: 0 0 .5rem;
}
.interior-preview p {
  margin: 0 0 1rem;
  color: #52636a;
}
.interior-preview img {
  display: block;
  width: 100%;
  max-width: 760px;
  height: auto;
  margin: 0 auto;
  border: 1px solid #d7dfe1;
  background: #fff;
  box-shadow: 0 4px 18px rgba(20,40,50,.08);
}