:root{
  --bg:#fbf9f5; --ink:#1f2533; --muted:#5d6473; --line:#e7e2d8;
  --brand:#2f5d8a; --brand-2:#c2543f; --card:#ffffff; --radius:16px;
  --max:1080px; --shadow:0 6px 24px rgba(31,37,51,.07);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
.site-head{position:sticky;top:0;z-index:10;background:rgba(251,249,245,.92);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:800;font-size:20px;letter-spacing:-.02em;color:var(--ink)}
.logo span{color:var(--brand)}
.lang-nav a{display:inline-block;margin-left:10px;padding:8px 6px;font-size:14px;color:var(--muted);font-weight:600}
.lang-nav a.active{color:var(--brand)}

/* Hero */
.hero{padding:64px 0 32px;text-align:center}
.hero h1{font-size:clamp(28px,5vw,44px);line-height:1.15;margin:0 0 14px;letter-spacing:-.02em}
.hero p{font-size:18px;color:var(--muted);max-width:620px;margin:0 auto}

/* Language chooser (root) */
.lang-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));
  gap:18px;margin:40px 0 60px}
.lang-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;text-align:center;box-shadow:var(--shadow);transition:transform .15s}
.lang-card:hover{transform:translateY(-3px);text-decoration:none}
.lang-card .flag{font-size:34px}
.lang-card h2{margin:10px 0 4px;font-size:20px;color:var(--ink)}
.lang-card p{margin:0;color:var(--muted);font-size:14px}

/* Book grid */
.section-title{font-size:24px;margin:40px 0 6px}
.section-sub{color:var(--muted);margin:0 0 24px}
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));
  gap:24px;margin:24px 0 60px}
.book-card{background:var(--card);border:1px solid var(--line);border-radius:12px;
  overflow:hidden;box-shadow:var(--shadow);transition:transform .15s}
.book-card:hover{transform:translateY(-3px);text-decoration:none}
.book-card .cover{aspect-ratio:2/3;background:#eee;object-fit:cover;width:100%}
.book-card .meta{padding:12px 14px}
.book-card .meta h3{font-size:15px;margin:0 0 4px;color:var(--ink);line-height:1.3}
.book-card .meta span{font-size:13px;color:var(--muted)}

/* Book detail page */
.book{display:grid;grid-template-columns:300px 1fr;gap:40px;margin:40px 0 56px}
.book .cover-col img{border-radius:12px;box-shadow:var(--shadow);width:100%}
.book h1{font-size:clamp(24px,4vw,34px);margin:0 0 6px;line-height:1.2}
.book .author{color:var(--muted);font-size:17px;margin:0 0 20px}
.book .desc{font-size:17px}
.book .desc p{margin:0 0 16px}
.buy{display:inline-block;background:var(--brand-2);color:#fff;font-weight:700;
  padding:14px 26px;border-radius:10px;margin:10px 0 8px;font-size:16px}
.buy:hover{filter:brightness(.94);text-decoration:none}
.buy-note{font-size:13px;color:var(--muted);margin:4px 0 0}
.crumbs{font-size:13px;color:var(--muted);padding:18px 0 0}
.crumbs a{color:var(--muted)}
.tags{margin:18px 0}
.tag{display:inline-block;background:#eef2f7;color:var(--brand);font-size:12px;
  padding:4px 10px;border-radius:20px;margin:0 6px 6px 0;font-weight:600}

/* Footer */
.site-foot{border-top:1px solid var(--line);padding:32px 0;margin-top:40px;
  color:var(--muted);font-size:14px;text-align:center}
.site-foot a{color:var(--muted);display:inline-block;padding:4px 2px}

@media(max-width:640px){
  .book{grid-template-columns:1fr;gap:24px}
  .book .cover-col{max-width:240px;margin:0 auto}
}

/* Approfondimento + FAQ (contenuto SEO esteso) */
.approfondimento{max-width:760px;margin:8px auto 0}
.approfondimento h2{font-size:24px;margin:34px 0 10px;line-height:1.25}
.approfondimento h3{font-size:19px;margin:24px 0 6px}
.approfondimento p{margin:0 0 16px}
.faq{max-width:760px;margin:6px auto 0}
.faq h2{font-size:24px;margin:34px 0 10px}
.faq-item{border-top:1px solid var(--line)}
.faq-item summary{cursor:pointer;font-weight:700;padding:14px 0;font-size:17px;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";color:var(--brand);font-weight:700}
.faq-item[open] summary::after{content:"\2013"}
.faq-item>div{padding:0 0 16px;color:var(--ink)}
.buy-again{text-align:center;margin:38px 0 10px}

/* Pulsante secondario: torna al catalogo della lingua */
.catalog-link{text-align:center;margin:10px 0 6px}
.catalog-link a{display:inline-block;border:1px solid var(--brand);color:var(--brand);font-weight:700;
  padding:12px 24px;border-radius:10px;text-decoration:none;font-size:15px;transition:background .15s,color .15s}
.catalog-link a:hover{background:var(--brand);color:#fff}

/* Mini-link discreto sotto il pulsante Amazon */
.catalog-mini{margin:4px 0 0}
.catalog-mini a{font-size:14px;color:var(--brand);font-weight:600;text-decoration:none}
.catalog-mini a:hover{text-decoration:underline}