:root{
  --bg:#080d1c; --bg2:#101832; --card:#141d3a; --card2:#1a2547;
  --accent:#f5a623; --accent2:#ffd479; --text:#eaeffa; --muted:#9aa7c7;
  --line:#26315a; --good:#37d39b;
  --radius:16px;
  --font-display:"Sora","Segoe UI",system-ui,sans-serif;
  --font-body:"Inter","Segoe UI",system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  background:
    radial-gradient(1100px 520px at 75% -10%,#1c2a5c 0%,transparent 60%),
    radial-gradient(900px 500px at -10% 30%,#131f45 0%,transparent 55%),
    var(--bg);
  color:var(--text);line-height:1.6;min-height:100vh;
  -webkit-font-smoothing:antialiased
}
.container{max-width:1180px;margin:0 auto;padding:0 20px}
a{color:inherit;text-decoration:none}
img{max-width:100%}
::selection{background:rgba(245,166,35,.35)}

.skip-link{position:absolute;left:-9999px;top:0;background:var(--accent);color:#1a1205;padding:10px 16px;border-radius:0 0 10px 0;font-weight:700;z-index:100}
.skip-link:focus{left:0}

:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

/* ---------- Header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(8,13,28,.8);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:18px;height:66px}
.brand{font-family:var(--font-display);font-weight:800;font-size:1.02rem;letter-spacing:.02em;background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent;white-space:nowrap}
.main-nav{display:flex;gap:24px;margin-left:auto}
.main-nav a{padding:6px 2px;color:var(--muted);font-weight:600;font-size:.95rem;border-bottom:2px solid transparent;transition:color .2s,border-color .2s}
.main-nav a:hover,.main-nav a.active{color:var(--text);border-color:var(--accent)}
.lang-switch{display:flex;gap:4px;align-items:center;margin-left:8px}
.lang-switch button{background:var(--card);border:1px solid var(--line);color:var(--muted);border-radius:9px;padding:6px 8px;cursor:pointer;font-size:.74rem;font-weight:800;letter-spacing:.04em;line-height:1;font-family:var(--font-body);transition:transform .15s,border-color .15s,color .15s}
.lang-switch button:hover{transform:translateY(-1px);border-color:var(--accent)}
.lang-switch button.active{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent);color:var(--accent2)}
.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.5rem;cursor:pointer;padding:4px 8px}

/* ---------- Hero ---------- */
.hero{padding:84px 0 48px;text-align:center;position:relative;overflow:hidden}
.hero .kicker{color:var(--accent);font-size:.78rem;font-weight:800;letter-spacing:.22em;text-transform:uppercase;margin-bottom:16px}
.hero h1{font-family:var(--font-display);font-size:clamp(2.1rem,5.5vw,3.4rem);font-weight:800;line-height:1.08;margin-bottom:18px;letter-spacing:-.01em}
.hero h1 .grad{background:linear-gradient(90deg,var(--accent),var(--accent2) 60%,#fff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{max-width:660px;margin:0 auto 30px;color:var(--muted);font-size:1.1rem}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;background:linear-gradient(90deg,var(--accent),var(--accent2));color:#1a1205;font-weight:800;padding:13px 28px;border-radius:13px;transition:transform .2s,box-shadow .2s;box-shadow:0 8px 24px rgba(245,166,35,.25);border:none;cursor:pointer;font-size:1rem;font-family:var(--font-body)}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(245,166,35,.38)}
.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--line);box-shadow:none;font-weight:700}
.btn.ghost:hover{border-color:var(--accent);color:var(--accent2);box-shadow:none}
.hero-stats{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;margin-top:44px}
.hero-stats .stat{background:rgba(20,29,58,.75);border:1px solid var(--line);border-radius:14px;padding:16px 26px;min-width:150px}
.hero-stats strong{display:block;font-family:var(--font-display);font-size:1.7rem;color:var(--accent2);line-height:1.2}
.hero-stats span{color:var(--muted);font-size:.85rem}

/* ---------- Aviso destacado (regalo / idiomas) ---------- */
#notice{padding:0 0 12px}
.notice-box{display:flex;gap:18px;align-items:flex-start;background:linear-gradient(135deg,rgba(245,166,35,.14),rgba(255,212,121,.06));border:1px solid rgba(245,166,35,.4);border-radius:var(--radius);padding:22px 26px;max-width:900px;margin:0 auto}
.notice-icon{font-size:1.8rem;line-height:1;flex-shrink:0}
.notice-box p{color:var(--text);font-size:.96rem;line-height:1.6;margin-bottom:8px}
.notice-box p:last-child{margin-bottom:0;color:var(--muted)}
@media (max-width:600px){
  .notice-box{flex-direction:column;gap:10px;padding:20px}
}

/* ---------- Secciones ---------- */
section{padding:48px 0}
.section-title{font-family:var(--font-display);font-size:1.7rem;font-weight:800;margin-bottom:8px;letter-spacing:-.01em}
.section-sub{color:var(--muted);margin-bottom:28px;max-width:640px}
.center{text-align:center;margin-top:34px}

/* ---------- Toolbar (busqueda + filtros) ---------- */
.toolbar{background:rgba(16,24,50,.55);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin-bottom:28px;display:flex;flex-direction:column;gap:14px}
#bookSearch{width:100%;max-width:420px;background:var(--bg2);border:1px solid var(--line);color:var(--text);border-radius:11px;padding:11px 16px;font-size:.98rem;font-family:var(--font-body);transition:border-color .15s}
#bookSearch::placeholder{color:var(--muted)}
#bookSearch:focus{outline:none;border-color:var(--accent)}
.filter-group{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.filter-label{color:var(--muted);font-size:.82rem;font-weight:700;white-space:nowrap;letter-spacing:.02em}
.filters{display:flex;gap:8px;flex-wrap:wrap}
.filters button{background:var(--card);border:1px solid var(--line);color:var(--muted);padding:7px 13px;border-radius:999px;cursor:pointer;font-weight:600;font-size:.85rem;font-family:var(--font-body);transition:color .15s,border-color .15s,background .15s}
.filters button:hover{color:var(--text);border-color:var(--accent)}
.filters button.active{background:linear-gradient(90deg,var(--accent),var(--accent2));color:#1a1205;border-color:transparent}
.results-count{color:var(--muted);font-size:.85rem;font-weight:600}

/* ---------- Grid de libros ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:22px}
.card{background:linear-gradient(180deg,var(--card),var(--card2));border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .25s,border-color .25s,box-shadow .25s}
.card:hover{transform:translateY(-5px);border-color:var(--accent);box-shadow:0 18px 40px rgba(0,0,0,.4)}
.cover{position:relative;aspect-ratio:3/4;background:#0b1330;display:flex;align-items:center;justify-content:center;overflow:hidden}
.cover-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center;filter:blur(16px) brightness(.5) saturate(1.1);transform:scale(1.2)}
.cover-img{position:relative;z-index:1;width:100%;height:100%;object-fit:contain;object-position:center;transition:transform .4s;filter:drop-shadow(0 6px 18px rgba(0,0,0,.55))}
.card:hover .cover-img{transform:scale(1.04)}
.cover-letter{font-family:var(--font-display);font-size:3rem;font-weight:800;color:var(--accent)}
.lang-badge{position:absolute;z-index:2;top:10px;right:10px;background:rgba(8,13,28,.85);backdrop-filter:blur(6px);border:1px solid var(--line);color:var(--text);font-size:.72rem;font-weight:800;padding:4px 9px;border-radius:999px;letter-spacing:.04em}
.card-body{padding:16px 16px 18px;display:flex;flex-direction:column;gap:11px;flex:1}
.card h3{font-family:var(--font-display);font-size:1rem;font-weight:700;line-height:1.35}
.card .description{font-size:.86rem;color:var(--muted);line-height:1.55}
.card .cat{display:flex;gap:6px;flex-wrap:wrap}
.chip{font-size:.7rem;background:var(--bg2);border:1px solid var(--line);color:var(--muted);padding:3px 9px;border-radius:999px;font-weight:600}
.stores{margin-top:auto;display:flex;flex-direction:column;gap:9px;padding-top:4px}
.btn-amazon{display:block;text-align:center;background:linear-gradient(90deg,var(--accent),var(--accent2));color:#1a1205;font-weight:800;font-size:.88rem;padding:10px 12px;border-radius:10px;transition:transform .15s,box-shadow .15s}
.btn-amazon:hover{transform:translateY(-1px);box-shadow:0 8px 20px rgba(245,166,35,.3)}
.store-alt{display:flex;align-items:center;gap:7px;flex-wrap:wrap}
.store-alt span{color:var(--muted);font-size:.74rem;font-weight:600}
.store-flag{font-size:.7rem;font-weight:800;letter-spacing:.04em;color:var(--muted);line-height:1;padding:5px 8px;border:1px solid var(--line);border-radius:8px;background:var(--bg2);transition:border-color .15s,transform .15s,color .15s}
.store-flag:hover{border-color:var(--accent);color:var(--accent2);transform:translateY(-1px)}

/* ---------- FAQ ---------- */
.faq-list{max-width:820px;display:flex;flex-direction:column;gap:12px}
.faq-item{background:linear-gradient(180deg,var(--card),var(--card2));border:1px solid var(--line);border-radius:14px;padding:6px 20px;transition:border-color .2s}
.faq-item:hover{border-color:var(--accent)}
.faq-item summary{cursor:pointer;list-style:none;padding:16px 30px 16px 0;font-weight:700;font-size:1.02rem;position:relative}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:0;top:14px;font-size:1.3rem;color:var(--accent);font-weight:800;transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{color:var(--muted);padding-bottom:18px;line-height:1.6;font-size:.95rem}

/* ---------- Sin resultados ---------- */
.empty{text-align:center;padding:60px 20px;color:var(--muted)}
.empty p{margin-bottom:18px;font-size:1.05rem}

/* ---------- Autor y contacto ---------- */
.author-layout{display:grid;grid-template-columns:290px 1fr;gap:36px;align-items:start;max-width:1080px}
.author-photo{margin:0;position:sticky;top:90px}
.author-photo img{width:100%;border-radius:var(--radius);border:1px solid var(--line);box-shadow:0 18px 40px rgba(0,0,0,.45);display:block}
.author-photo figcaption{text-align:center;color:var(--muted);font-size:.85rem;font-weight:600;margin-top:10px}
@media (max-width:760px){
  .author-layout{grid-template-columns:1fr;gap:24px}
  .author-photo{position:static;max-width:300px;margin:0 auto}
}
.prose{max-width:760px}
.prose p{color:var(--muted);margin-bottom:16px;font-size:1.06rem}
.contact-box{background:linear-gradient(180deg,var(--card),var(--card2));border:1px solid var(--line);border-radius:var(--radius);padding:28px;max-width:560px}
.contact-box a.mail{color:var(--accent);font-weight:700;font-size:1.12rem}
.contact-box a.mail:hover{color:var(--accent2)}
.disclaimer-box{border-left:3px solid var(--accent);background:var(--card);padding:16px 18px;border-radius:0 10px 10px 0;font-size:.9rem!important}

/* ---------- Volver arriba ---------- */
.back-top{position:fixed;bottom:26px;right:26px;z-index:60;width:46px;height:46px;border-radius:50%;border:1px solid var(--line);background:rgba(16,24,50,.9);backdrop-filter:blur(8px);color:var(--accent2);font-size:1.2rem;cursor:pointer;opacity:0;pointer-events:none;transform:translateY(10px);transition:opacity .25s,transform .25s,border-color .2s}
.back-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
.back-top:hover{border-color:var(--accent)}

/* ---------- Footer ---------- */
.site-footer{border-top:1px solid var(--line);padding:30px 0;margin-top:48px;color:var(--muted);font-size:.86rem;text-align:center}
.site-footer .disclaimer{font-size:.72rem;opacity:.6;margin-top:8px;max-width:760px;margin-left:auto;margin-right:auto}

/* ---------- Animaciones ---------- */
.reveal{animation:fadeUp .5s ease both}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}

/* ---------- Responsive ---------- */
@media (max-width:760px){
  .header-inner{gap:8px;padding:0 14px;height:60px}
  .brand{font-size:.88rem}
  .main-nav{position:fixed;top:60px;left:0;right:0;background:#0a1024;flex-direction:column;padding:18px 24px 22px;gap:16px;border-bottom:1px solid var(--line);box-shadow:0 18px 40px rgba(0,0,0,.5);display:none;margin-left:0}
  .main-nav.open{display:flex}
  .main-nav a{font-size:1.05rem}
  .menu-toggle{display:block;font-size:1.35rem;padding:2px 4px}
  .lang-switch{margin-left:auto;gap:3px}
  .lang-switch button{padding:5px 5px;font-size:.64rem}
  .hero{padding:56px 0 36px}
  .hero-stats .stat{min-width:120px;padding:13px 18px}
  .filter-group{flex-direction:column;gap:8px}
}