:root{
  --bg:#0b1020; --bg2:#121a33; --card:#151e3b; --line:rgba(255,255,255,.1);
  --text:#eef2ff; --muted:#a8b3d6; --naranja:#ff8a1f; --amarillo:#ffc53d; --verde:#22c55e;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color-scheme:dark;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--sans);background:var(--bg);color:var(--text);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1080px;margin:0 auto;padding-inline:20px}
:focus-visible{outline:3px solid var(--amarillo);outline-offset:3px}
header{position:sticky;top:0;z-index:20;background:rgba(11,16,32,.9);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;gap:12px;height:62px}
.logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:1.15rem;text-decoration:none}
.logo img{width:34px;height:34px;border-radius:9px}
.logo b{background:linear-gradient(90deg,var(--naranja),var(--amarillo));-webkit-background-clip:text;background-clip:text;color:transparent}
.bar nav{display:flex;gap:18px;font-weight:700;color:var(--muted);font-size:.95rem}
.bar nav a{text-decoration:none}
.bar nav a:hover,.bar nav a[aria-current]{color:var(--text)}
h1,h2,h3{line-height:1.1;text-wrap:balance}
.eyebrow{font-size:.8rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--c,var(--amarillo))}
/* ficha del libro */
.hero{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:48px;align-items:center;padding-block:48px 40px}
.portada{position:relative;max-width:380px;justify-self:center;width:100%}
.portada img{border-radius:10px;box-shadow:0 30px 60px rgba(0,0,0,.55),0 0 0 1px var(--line);transform:rotate(-2deg)}
.info{display:grid;gap:16px;min-width:0}
.info h1{font-size:clamp(2rem,5vw,3.1rem);font-weight:900;letter-spacing:-.02em}
.info .corto{font-size:1.15rem;color:var(--muted);max-width:52ch}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips span{font-size:.88rem;font-weight:700;padding:6px 12px;border-radius:30px;background:var(--bg2);border:1px solid var(--line)}
.compra{display:grid;gap:10px;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:18px 20px;margin-top:6px}
.precio{font-size:1.9rem;font-weight:900;font-variant-numeric:tabular-nums}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:15px 26px;border-radius:14px;font-weight:900;font-size:1.1rem;text-decoration:none;border:0;background:var(--amarillo);color:#1b1300;transition:transform .15s,filter .15s}
.btn:hover{transform:translateY(-2px);filter:brightness(1.06)}
.btn[aria-disabled=true]{background:var(--bg2);color:var(--muted);border:2px dashed var(--line);cursor:default;transform:none}
.nota{font-size:.88rem;color:var(--muted)}
section.bloque{padding-block:34px;border-top:1px solid var(--line)}
section.bloque h2{font-size:1.6rem;font-weight:900;margin-bottom:16px}
.dos{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:40px}
.lista{list-style:none;display:grid;gap:10px}
.lista li{display:grid;grid-template-columns:22px 1fr;gap:10px}
.lista li::before{content:"";width:12px;height:12px;border-radius:50%;background:var(--c,var(--amarillo));margin-top:7px}
.para{color:var(--muted);font-size:1.05rem}
.muestras{display:flex;gap:14px;overflow-x:auto;padding-bottom:8px;scroll-snap-type:x mandatory}
.muestras img{flex:none;width:min(340px,78vw);border-radius:14px;scroll-snap-align:start}
details{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 18px}
details+details{margin-top:8px}
summary{font-weight:800;cursor:pointer}
details p{margin-top:8px;color:var(--muted)}
/* tarjetas de libros */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:18px}
.tarjeta{display:grid;grid-template-rows:auto 1fr;background:var(--card);border:1px solid var(--line);border-radius:18px;overflow:hidden;text-decoration:none;transition:transform .15s}
.tarjeta:hover{transform:translateY(-3px)}
.tarjeta .t-img{background:var(--bg2);padding:22px 30px 0;display:flex;justify-content:center;height:250px;overflow:hidden}
.tarjeta .t-img img{width:72%;border-radius:6px 6px 0 0;box-shadow:0 10px 30px rgba(0,0,0,.5);align-self:flex-start}
.tarjeta .t-tx{padding:16px 18px 18px;display:grid;gap:6px;align-content:start}
.tarjeta h3{font-size:1.15rem;font-weight:800}
.tarjeta p{font-size:.93rem;color:var(--muted)}
.tarjeta .ver{font-weight:800;color:var(--amarillo);margin-top:4px}
.intro{padding-block:56px 30px;display:grid;gap:14px}
.intro h1{font-size:clamp(2.2rem,6vw,3.6rem);font-weight:900;letter-spacing:-.02em}
.intro p{color:var(--muted);font-size:1.15rem;max-width:58ch}
footer{border-top:1px solid var(--line);padding-block:28px 40px;color:var(--muted);font-size:.9rem;text-align:center}
@media(max-width:760px){.hero,.dos{grid-template-columns:1fr;gap:28px}.portada{max-width:320px;margin:0 auto}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}