/* =========================================================
   Universal Books · Tienda
   Paleta tomada del logo UB: tinta del lomo, azul de las letras,
   hielo de la página abierta.
   ========================================================= */
:root{
  --tinta:#16224A;      /* fondo profundo (base del libro del logo) */
  --marino:#2B3A78;     /* tapa del libro */
  --ub:#377FA0;         /* letras UB */
  --ub-osc:#25617D;
  --cielo:#CFEAFB;      /* página clara */
  --bruma:#E7F2FA;
  --papel:#F5F9FC;      /* fondo general, papel frío */
  --texto:#18213A;
  --suave:#56627E;
  --linea:#D6E2EC;
  --ok:#1E8E62;
  --alerta:#B4462F;
  --serif:"Young Serif", Georgia, "Times New Roman", serif;
  --sans:"Instrument Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --wrap:1240px;
  --r-s:6px; --r-m:12px; --r-l:22px;
  --sombra-libro: 0 1px 1px rgba(22,34,74,.12), 0 10px 24px -8px rgba(22,34,74,.35);
  --ease: cubic-bezier(.2,.8,.2,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);font-size:1rem;line-height:1.55;color:var(--texto);background:var(--papel);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:3px solid var(--ub);outline-offset:2px;border-radius:4px}
.sr,.hp{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:0;background:var(--tinta);color:#fff;padding:.6rem 1rem;z-index:100}
.skip:focus{left:1rem}
.wrap{width:min(100% - 2.5rem, var(--wrap));margin-inline:auto}
[hidden]{display:none!important}

/* ---------- Botones ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;min-height:48px;padding:.75rem 1.4rem;border-radius:999px;border:1.5px solid transparent;font-weight:600;text-decoration:none;cursor:pointer;transition:background .2s,color .2s,transform .15s,border-color .2s;white-space:nowrap}
.btn:active{transform:scale(.97)}
.btn--solid{background:var(--ub);color:#fff}
.btn--solid:hover{background:var(--ub-osc)}
.btn--ghost{border-color:var(--linea);background:#fff;color:var(--marino)}
.btn--ghost:hover{border-color:var(--ub);color:var(--ub-osc)}
.btn--light{background:var(--cielo);color:var(--tinta)}
.btn--light:hover{background:#fff}
.btn--block{width:100%}
.btn--grow{flex:1}
.icon-btn{display:inline-grid;place-items:center;min-width:44px;height:44px;padding:0 .7rem;border-radius:999px;border:1.5px solid var(--linea);background:#fff;cursor:pointer;font-size:.95rem;color:var(--marino)}
.icon-btn:hover{border-color:var(--ub)}
.link{color:var(--ub-osc);font-weight:600;text-underline-offset:3px;background:none;border:0;padding:0;cursor:pointer}
.link--danger{color:var(--alerta)}

/* ---------- Barra de aviso + header ---------- */
.notice-bar{background:var(--tinta);color:var(--cielo);text-align:center;font-size:.85rem;padding:.45rem 1rem}
.site-header{position:sticky;top:0;z-index:40;background:rgba(245,249,252,.86);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid transparent;transition:border-color .3s}
.site-header.is-scrolled{border-bottom-color:var(--linea)}
.site-header__in{display:flex;align-items:center;gap:2rem;height:76px}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none}
.brand img{width:44px;height:44px;object-fit:contain}
.brand__name{font-family:var(--serif);font-size:1.02rem;line-height:1.02;color:var(--tinta)}
.main-nav{display:flex;gap:1.6rem;margin-right:auto}
.main-nav a{text-decoration:none;font-weight:500;color:var(--suave);padding:.4rem 0;position:relative}
.main-nav a:hover,.main-nav a[aria-current]{color:var(--tinta)}
.main-nav a[aria-current]::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--ub)}
.site-header__tools{display:flex;align-items:center;gap:.6rem}
.search-trigger{display:flex;align-items:center;gap:.6rem;height:44px;padding:0 .6rem 0 1rem;border:1.5px solid var(--linea);border-radius:999px;background:#fff;color:var(--suave);cursor:pointer;min-width:280px}
.search-trigger:hover{border-color:var(--ub)}
.search-trigger svg,.cart-trigger svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.search-trigger span{flex:1;text-align:left;font-size:.92rem}
kbd{font-family:var(--sans);font-size:.75rem;border:1px solid var(--linea);border-radius:5px;padding:.05rem .45rem;color:var(--suave)}
.cart-trigger{position:relative;display:grid;place-items:center;width:46px;height:46px;border-radius:50%;border:0;background:var(--tinta);color:#fff;cursor:pointer}
.cart-trigger.is-bump{animation:bump .5s var(--ease)}
@keyframes bump{30%{transform:scale(1.18)}60%{transform:scale(.94)}}
.cart-count{position:absolute;top:-4px;right:-4px;min-width:22px;height:22px;padding:0 6px;border-radius:999px;background:var(--cielo);color:var(--tinta);font-size:.75rem;font-weight:700;display:grid;place-items:center;border:2px solid var(--papel)}
.menu-trigger{display:none;width:46px;height:46px;border:0;background:none;cursor:pointer;position:relative}
.menu-trigger span{position:absolute;left:12px;right:12px;height:2px;background:var(--tinta);transition:transform .3s var(--ease)}
.menu-trigger span:first-child{top:18px}.menu-trigger span:last-child{top:26px}
.menu-trigger[aria-expanded="true"] span:first-child{transform:translateY(4px) rotate(45deg)}
.menu-trigger[aria-expanded="true"] span:last-child{transform:translateY(-4px) rotate(-45deg)}
.mobile-nav{display:grid;padding:.5rem 1.25rem 1.25rem;border-top:1px solid var(--linea);background:var(--papel)}
.mobile-nav a{padding:.85rem 0;border-bottom:1px solid var(--linea);text-decoration:none;font-family:var(--serif);font-size:1.15rem;display:flex;justify-content:space-between}
.mobile-nav small{font-family:var(--sans);color:var(--suave)}

/* =========================================================
   HERO: la estantería
   ========================================================= */
.hero{background:var(--tinta);color:#fff;overflow:hidden;position:relative;isolation:isolate}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(60% 80% at 85% 0%, rgba(55,127,160,.45), transparent 60%),
    radial-gradient(40% 60% at 0% 100%, rgba(43,58,120,.9), transparent 70%)}
.hero__copy{display:grid;grid-template-columns:1.25fr 1fr;gap:3rem;align-items:end;padding-block:clamp(3rem,7vw,6rem) clamp(2rem,4vw,3.5rem)}
.hero__title{font-family:var(--serif);font-weight:400;font-size:clamp(2.9rem,7.4vw,6.4rem);line-height:.98;letter-spacing:-.02em;margin:0;color:var(--cielo)}
.hero__title .line{display:block;overflow:hidden;padding-bottom:.08em}
.hero__title .line span{display:block;animation:rise 1s var(--ease) both}
.hero__title .line:nth-child(2) span{animation-delay:.12s;color:#fff}
@keyframes rise{from{transform:translateY(105%)}to{transform:none}}
.hero__lead{color:#C4D3E6;font-size:1.08rem;max-width:44ch;margin:0 0 1.4rem}
.hero__search{display:flex;gap:.4rem;padding:.35rem;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid rgba(207,234,251,.22)}
.hero__search input{flex:1;min-width:0;background:none;border:0;color:#fff;padding:0 1rem;font-size:1rem}
.hero__search input::placeholder{color:#9FB3CC}
.hero__search input:focus{outline:none}
.hero__search:focus-within{border-color:var(--cielo)}
.hero__count{margin:1rem 0 0;font-size:.93rem}
.hero__count a{color:var(--cielo);text-underline-offset:4px}

/* Estantería: dos filas de lomos que se mueven en sentidos opuestos */
.shelf{position:relative;padding-top:.5rem;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 6%,#000 94%,transparent);
          mask-image:linear-gradient(90deg,transparent,#000 6%,#000 94%,transparent)}
.shelf__row{height:clamp(170px,22vw,230px);overflow:hidden;display:flex;align-items:flex-end}
.shelf__track{display:flex;align-items:flex-end;gap:5px;height:100%;width:max-content;padding-inline:3px;animation:slide 110s linear infinite}
.shelf__row--r .shelf__track{animation-direction:reverse;animation-duration:130s}
.shelf:hover .shelf__track,.shelf:focus-within .shelf__track{animation-play-state:paused}
@keyframes slide{to{transform:translateX(-50%)}}
.shelf__plank{height:14px;background:linear-gradient(#3A4C8F,#22306A);box-shadow:0 10px 18px -6px rgba(0,0,0,.6);border-radius:2px;margin-bottom:1.6rem}
.shelf__plank:last-child{margin-bottom:0}

.spine{
  position:relative;flex:none;width:var(--w);height:var(--h);
  background:var(--bg,var(--marino));color:var(--fg,var(--cielo));text-decoration:none;
  border-radius:3px 3px 1px 1px;
  display:flex;flex-direction:column;align-items:center;justify-content:space-between;
  padding:.7rem 0 .55rem;
  box-shadow: inset 3px 0 0 rgba(255,255,255,.12), inset -4px 0 0 rgba(0,0,0,.18);
  transform-origin:bottom center;
  transition:transform .35s var(--ease), filter .35s;
}
.spine::before,.spine::after{content:"";position:absolute;left:0;right:0;height:2px;background:currentColor;opacity:.35}
.spine::before{top:12%}.spine::after{bottom:16%}
.spine__t{writing-mode:vertical-rl;transform:rotate(180deg);font-family:var(--serif);font-size:.86rem;line-height:1.05;max-height:70%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.spine__a{writing-mode:vertical-rl;transform:rotate(180deg);font-size:.62rem;letter-spacing:.04em;opacity:.75;max-height:24%;overflow:hidden;white-space:nowrap}
.spine:hover,.spine:focus-visible{transform:translateY(-22px) rotate(-2deg);filter:brightness(1.12);z-index:3}
.spine__tip{position:absolute;bottom:calc(100% + 30px);left:50%;transform:translate(-50%,6px);width:max-content;max-width:240px;
  background:#fff;color:var(--tinta);padding:.55rem .8rem;border-radius:var(--r-s);font-size:.82rem;line-height:1.3;
  box-shadow:0 12px 30px -8px rgba(0,0,0,.45);opacity:0;pointer-events:none;transition:opacity .2s,transform .25s var(--ease)}
.spine__tip b{display:block;font-family:var(--serif);font-weight:400;font-size:.95rem}
.spine:hover .spine__tip,.spine:focus-visible .spine__tip{opacity:1;transform:translate(-50%,0)}
.shelf__row{overflow:visible;clip-path:inset(-60px -100vw 0 -100vw)}

/* Paletas compartidas por lomos y portadas generadas */
.p0{--bg:#2B3A78;--fg:#CFEAFB;--acc:#377FA0}
.p1{--bg:#377FA0;--fg:#F5F9FC;--acc:#16224A}
.p2{--bg:#CFEAFB;--fg:#16224A;--acc:#377FA0}
.p3{--bg:#0F1838;--fg:#8FC9E8;--acc:#2B3A78}
.p4{--bg:#E9F0F6;--fg:#2B3A78;--acc:#CFEAFB}
.p5{--bg:#1F5F7C;--fg:#E6F4FC;--acc:#8FC9E8}

/* ---------- Franja de promesa ---------- */
.promise{border-bottom:1px solid var(--linea);background:#fff}
.promise__in{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem;padding-block:1.6rem}
.promise p{margin:0;color:var(--suave);font-size:.95rem}
.promise strong{display:block;color:var(--tinta);font-family:var(--serif);font-weight:400;font-size:1.12rem}

/* ---------- Secciones ---------- */
.section{padding-block:clamp(3rem,6vw,5rem)}
.section--tint{background:var(--bruma)}
.section__head{display:flex;align-items:end;justify-content:space-between;gap:1rem;margin-bottom:1.8rem}
.section__title{font-family:var(--serif);font-weight:400;font-size:clamp(1.8rem,3.4vw,2.6rem);line-height:1.1;margin:0 0 1.6rem;color:var(--tinta);letter-spacing:-.01em}
.section__head .section__title{margin:0}
.rail-ctrl{display:flex;gap:.5rem}

/* Carrusel horizontal */
.rail{display:grid;grid-auto-flow:column;grid-auto-columns:clamp(160px,18vw,210px);gap:1.4rem;overflow-x:auto;scroll-snap-type:x mandatory;
  padding:0 max(1.25rem,calc((100vw - var(--wrap))/2)) 1rem;scroll-padding-inline:max(1.25rem,calc((100vw - var(--wrap))/2));scrollbar-width:thin}
.rail>*{scroll-snap-align:start}
.rail:focus-visible{outline-offset:-3px}

/* ---------- Tarjeta de libro ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:2.2rem 1.6rem}
.book{display:flex;flex-direction:column;min-width:0}
.book__cover{position:relative;display:block;aspect-ratio:2/3;perspective:900px;margin-bottom:.9rem}
.book__cover .cover{transition:transform .45s var(--ease), box-shadow .45s var(--ease);transform-origin:left center}
.book:hover .book__cover .cover{transform:rotateY(-14deg) translateX(4px);box-shadow:14px 18px 30px -12px rgba(22,34,74,.45)}
.book.is-out .cover{filter:grayscale(.75);opacity:.7}
.book__title{font-family:var(--serif);font-weight:400;font-size:1.05rem;line-height:1.25;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.book__title a{text-decoration:none}
.book__title a:hover{color:var(--ub-osc)}
.book__author{margin:.15rem 0 .6rem;color:var(--suave);font-size:.88rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.book__buy{display:flex;align-items:center;justify-content:space-between;margin-top:auto}
.price{font-weight:700;color:var(--tinta);font-size:1.02rem}
.price s{display:block;font-weight:400;font-size:.8rem;color:var(--suave)}
.add{width:42px;height:42px;border-radius:50%;border:1.5px solid var(--linea);background:#fff;color:var(--marino);display:grid;place-items:center;cursor:pointer;transition:background .2s,color .2s,border-color .2s,transform .2s}
.add svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.add:hover{background:var(--ub);border-color:var(--ub);color:#fff}
.add.is-done{background:var(--ok);border-color:var(--ok);color:#fff}
.tag{position:absolute;top:-.55rem;right:.5rem;z-index:2;background:#fff;color:var(--tinta);font-size:.74rem;font-weight:600;padding:.2rem .55rem;border-radius:999px;box-shadow:0 2px 8px rgba(22,34,74,.18)}
.tag--sale{background:var(--ub);color:#fff}
.tag--out{background:var(--tinta);color:#fff}

/* ---------- Portadas ---------- */
.cover{width:100%;height:100%;border-radius:3px 6px 6px 3px;box-shadow:var(--sombra-libro)}
.cover--img{object-fit:cover;background:var(--bruma)}
.cover--gen{
  position:relative;overflow:hidden;background:var(--bg,var(--marino));color:var(--fg,var(--cielo));
  display:flex;flex-direction:column;padding:12% 11% 10% 16%;container-type:inline-size}
/* bisagra del lomo */
.cover--gen::before{content:"";position:absolute;inset:0 auto 0 0;width:7%;background:linear-gradient(90deg,rgba(0,0,0,.22),rgba(255,255,255,.08) 70%,transparent)}
/* motivo geométrico: arcos concéntricos como páginas abiertas, posición según el libro */
.cover--gen::after{content:"";position:absolute;width:120%;aspect-ratio:1;right:calc(-70% + var(--seed) * 40%);bottom:calc(-75% + var(--seed) * 20%);
  border-radius:50%;background:repeating-radial-gradient(circle, transparent 0 9px, color-mix(in srgb, var(--fg) 22%, transparent) 9px 10px);opacity:.9}
.cover__ed{font-size:6.5cqi;opacity:.75;position:relative;z-index:1}
.cover__title{font-family:var(--serif);line-height:1.04;margin-top:auto;position:relative;z-index:1;font-size:12cqi;overflow-wrap:anywhere;hyphens:auto}
.fit-l .cover__title{font-size:15cqi}.fit-s .cover__title{font-size:10cqi}.fit-xs .cover__title{font-size:8cqi}
.cover__author{position:relative;z-index:1;font-size:7cqi;margin-top:6%;padding-top:5%;border-top:1px solid color-mix(in srgb, var(--fg) 40%, transparent)}
.cover__mark{position:absolute;top:9%;right:9%;font-family:var(--serif);font-size:7cqi;opacity:.55;z-index:1}

/* ---------- Autor ---------- */
.author{background:var(--marino);color:#fff;overflow:hidden}
.author__in{display:grid;grid-template-columns:1fr 1.15fr;gap:3rem;align-items:center;padding-block:clamp(3.5rem,7vw,6rem)}
.author__kicker{margin:0 0 .6rem;color:var(--cielo);font-size:.95rem}
.author__name{font-family:var(--serif);font-weight:400;font-size:clamp(2.6rem,6vw,5rem);line-height:.95;margin:0 0 1rem;letter-spacing:-.02em}
.author__count{color:#C4D3E6;margin:0 0 1.8rem}
.fan{position:relative;height:clamp(300px,36vw,420px)}
.fan__book{--spread:calc((var(--i) - (var(--n) - 1) / 2));
  position:absolute;left:50%;bottom:0;width:clamp(140px,17vw,200px);aspect-ratio:2/3;
  transform-origin:50% 140%;transform:translateX(-50%) rotate(calc(var(--spread) * 9deg));
  transition:transform .5s var(--ease);text-decoration:none;z-index:calc(10 - var(--i))}
.fan[data-fan] .fan__book{transform:translateX(-50%) rotate(0deg)}
.fan.is-open .fan__book{transform:translateX(-50%) rotate(calc(var(--spread) * 9deg))}
.fan__book:hover,.fan__book:focus-visible{transform:translateX(-50%) rotate(calc(var(--spread) * 9deg)) translateY(-26px)!important;z-index:20}
.fan__label{position:absolute;left:0;right:0;top:calc(100% + .6rem);text-align:center;font-size:.82rem;color:var(--cielo);opacity:0;transition:opacity .25s}
.fan__book:hover .fan__label,.fan__book:focus-visible .fan__label{opacity:1}

/* ---------- Categorías ---------- */
.cats{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--linea)}
.cats li{border-bottom:1px solid var(--linea)}
.cats li:not(:nth-child(4n)){border-right:1px solid var(--linea)}
.cats a{display:flex;flex-direction:column;justify-content:space-between;gap:2rem;min-height:150px;padding:1.3rem 1.2rem;text-decoration:none;position:relative;overflow:hidden;transition:color .3s}
.cats a::before{content:"";position:absolute;inset:0;background:var(--tinta);transform:translateY(101%);transition:transform .45s var(--ease);z-index:-1}
.cats a{isolation:isolate}
.cats a:hover{color:#fff}.cats a:hover::before{transform:none}
.cats span{font-family:var(--serif);font-size:1.45rem;line-height:1.1}
.cats small{color:var(--suave);transition:color .3s}
.cats a:hover small{color:var(--cielo)}

/* ---------- Editoriales ---------- */
.eds{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.3rem 2.2rem}
.eds a{font-family:var(--serif);font-size:clamp(1.4rem,3vw,2.3rem);text-decoration:none;color:var(--marino);line-height:1.3;transition:color .2s}
.eds a:hover{color:var(--ub)}
.eds sup{font-family:var(--sans);font-size:.8rem;color:var(--suave);margin-left:.25rem}

/* ---------- CTA WhatsApp ---------- */
.cta-wa{background:var(--cielo)}
.cta-wa__in{display:grid;grid-template-columns:1fr 1.2fr auto;gap:2rem;align-items:center;padding-block:3rem}
.cta-wa h2{font-family:var(--serif);font-weight:400;font-size:clamp(1.7rem,3vw,2.3rem);margin:0;color:var(--tinta);line-height:1.1}
.cta-wa p{margin:0;color:var(--marino)}

/* ---------- Footer ---------- */
.site-footer{background:var(--tinta);color:#B9C7DB;padding-top:3.5rem}
.site-footer__grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:2rem}
.site-footer__brand img{width:64px;height:64px;object-fit:contain;margin-bottom:1rem;background:#fff;border-radius:14px;padding:6px}
.site-footer__brand p{max-width:36ch;margin:0}
.site-footer h2{font-family:var(--serif);font-weight:400;font-size:1.1rem;color:#fff;margin:0 0 .8rem}
.site-footer a,.site-footer span{display:block;text-decoration:none;padding:.22rem 0;font-size:.93rem}
.site-footer a:hover{color:var(--cielo)}
.site-footer__legal{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;border-top:1px solid rgba(207,234,251,.15);margin-top:3rem;padding-block:1.4rem 2rem;font-size:.82rem}
.site-footer__legal span{padding:0}

.wa-float{position:fixed;right:1.2rem;bottom:1.2rem;z-index:30;width:58px;height:58px;border-radius:50%;background:#25D366;display:grid;place-items:center;box-shadow:0 10px 24px -6px rgba(0,0,0,.35);transition:transform .2s}
.wa-float:hover{transform:scale(1.07)}
.wa-float svg{width:30px;height:30px;fill:#fff}

/* ---------- Drawer del carrito ---------- */
.drawer{position:fixed;inset:0;z-index:60;pointer-events:none}
.drawer__veil{position:absolute;inset:0;background:rgba(15,24,56,.5);opacity:0;transition:opacity .3s}
.drawer__panel{position:absolute;top:0;right:0;bottom:0;width:min(440px,100%);background:var(--papel);display:flex;flex-direction:column;transform:translateX(100%);transition:transform .45s var(--ease);box-shadow:-20px 0 40px -20px rgba(0,0,0,.4)}
.drawer.is-open{pointer-events:auto}
.drawer.is-open .drawer__veil{opacity:1}
.drawer.is-open .drawer__panel{transform:none}
.drawer__head{display:flex;justify-content:space-between;align-items:center;padding:1.2rem 1.4rem;border-bottom:1px solid var(--linea)}
.drawer__head h2{font-family:var(--serif);font-weight:400;margin:0;font-size:1.5rem}
.drawer__free{margin:1rem 1.4rem 0;font-size:.88rem;color:var(--marino)}
.drawer__free:empty{display:none}
.meter{height:6px;border-radius:9px;background:var(--linea);margin-top:.45rem;overflow:hidden}
.meter i{display:block;height:100%;background:var(--ub);border-radius:inherit;transition:width .6s var(--ease)}
.drawer__body{flex:1;overflow-y:auto;padding:.6rem 1.4rem}
.drawer__foot{padding:1.2rem 1.4rem 1.4rem;border-top:1px solid var(--linea);display:grid;gap:.6rem;background:#fff}
.drawer__total{display:flex;justify-content:space-between;align-items:baseline;font-size:1.05rem;margin-bottom:.3rem}
.drawer__total strong{font-size:1.35rem}
.mini{display:grid;grid-template-columns:58px 1fr auto;gap:.9rem;align-items:center;padding:.9rem 0;border-bottom:1px solid var(--linea)}
.mini__cover{aspect-ratio:2/3;display:block}
.mini__title{font-family:var(--serif);line-height:1.2;text-decoration:none;display:block}
.mini__meta{font-size:.84rem;color:var(--suave)}
.mini__ctrl{display:flex;flex-direction:column;align-items:flex-end;gap:.4rem}
.drawer__empty{text-align:center;padding:3rem 1rem;color:var(--suave)}
.drawer__empty strong{display:block;font-family:var(--serif);font-weight:400;font-size:1.3rem;color:var(--tinta);margin-bottom:.4rem}

/* Cantidad */
.qty{display:inline-flex;align-items:center;border:1.5px solid var(--linea);border-radius:999px;background:#fff;height:48px}
.qty button{width:44px;height:100%;border:0;background:none;cursor:pointer;font-size:1.2rem;color:var(--marino)}
.qty input{width:44px;text-align:center;border:0;background:none;-moz-appearance:textfield;font-weight:600}
.qty input::-webkit-inner-spin-button{-webkit-appearance:none}
.qty--sm{height:38px}.qty--sm button{width:34px}.qty--sm input{width:34px}

/* ---------- Buscador ---------- */
.search-overlay{position:fixed;inset:0;z-index:70;background:rgba(15,24,56,.55);display:flex;justify-content:center;align-items:flex-start;padding:10vh 1rem 1rem;opacity:0;pointer-events:none;transition:opacity .25s}
.search-overlay.is-open{opacity:1;pointer-events:auto}
.search-overlay__box{width:min(680px,100%);background:#fff;border-radius:var(--r-l);overflow:hidden;box-shadow:0 30px 60px -20px rgba(0,0,0,.5);transform:translateY(-12px) scale(.98);transition:transform .3s var(--ease)}
.search-overlay.is-open .search-overlay__box{transform:none}
.search-overlay__form{display:flex;align-items:center;gap:.8rem;padding:1rem 1.2rem;border-bottom:1px solid var(--linea)}
.search-overlay__form svg{width:22px;height:22px;fill:none;stroke:var(--suave);stroke-width:1.8;flex:none}
.search-overlay__form input{flex:1;border:0;font-size:1.15rem;padding:.4rem 0;min-width:0}
.search-overlay__form input:focus{outline:none}
.search-overlay__results{max-height:60vh;overflow-y:auto}
.sr-item{display:grid;grid-template-columns:44px 1fr auto;gap:1rem;align-items:center;padding:.75rem 1.2rem;text-decoration:none}
.sr-item:hover,.sr-item.is-active{background:var(--bruma)}
.sr-item .cover{font-size:0}
.sr-item__t{font-family:var(--serif);display:block;line-height:1.2}
.sr-item__m{font-size:.84rem;color:var(--suave)}
.sr-group{padding:.8rem 1.2rem .3rem;font-size:.82rem;color:var(--suave);font-weight:600}
.sr-authors{display:flex;flex-wrap:wrap;gap:.5rem;padding:.2rem 1.2rem .8rem}
.sr-authors a{border:1px solid var(--linea);border-radius:999px;padding:.3rem .8rem;text-decoration:none;font-size:.9rem}
.sr-authors a:hover{border-color:var(--ub)}
.sr-all{display:block;padding:1rem 1.2rem;border-top:1px solid var(--linea);font-weight:600;color:var(--ub-osc);text-decoration:none}
.sr-empty{padding:1.6rem 1.2rem;color:var(--suave)}

/* Toast */
.toast{position:fixed;left:50%;bottom:1.5rem;z-index:80;transform:translate(-50%,calc(100% + 3rem));visibility:hidden;background:var(--tinta);color:#fff;padding:.85rem 1.3rem;border-radius:999px;font-size:.93rem;max-width:calc(100% - 2rem);transition:transform .4s var(--ease),visibility .4s;box-shadow:0 14px 30px -10px rgba(0,0,0,.5)}
.toast.is-on{transform:translate(-50%,0);visibility:visible}
.toast.is-error{background:var(--alerta)}

/* Libro volando al carrito */
.flying{position:fixed;z-index:90;pointer-events:none;border-radius:4px;overflow:hidden;box-shadow:var(--sombra-libro)}
.flying .cover{border-radius:0}

/* =========================================================
   Catálogo con filtros dinámicos
   ========================================================= */
.crumbs{display:flex;gap:.5rem;flex-wrap:wrap;font-size:.86rem;color:var(--suave);padding-top:1.4rem}
.crumbs a{text-decoration:none}.crumbs a:hover{color:var(--ub-osc);text-decoration:underline}
.catalog-head{background:var(--bruma);padding-bottom:2.2rem;margin-bottom:2.2rem}
.catalog-head__title{font-family:var(--serif);font-weight:400;font-size:clamp(2.2rem,5vw,3.8rem);line-height:1.02;margin:1rem 0 .4rem;color:var(--tinta);letter-spacing:-.015em}
.catalog-head__sub{margin:0;color:var(--suave);font-variant-numeric:tabular-nums}
.catalog{display:grid;grid-template-columns:260px 1fr;gap:3rem;padding-bottom:5rem;align-items:start}
.filters form{position:sticky;top:96px;display:grid;gap:1.6rem;max-height:calc(100vh - 110px);overflow-y:auto;padding:0 .5rem 1rem 0;scrollbar-width:thin}
.filters__head,.filters__foot{display:none}
.facet{border:0;padding:0;margin:0;min-width:0}
.facet legend{font-family:var(--serif);font-size:1.15rem;color:var(--tinta);margin-bottom:.55rem;padding:0}
.facet__list{display:grid;gap:.05rem}
.opt{position:relative;display:flex;align-items:center;gap:.65rem;padding:.4rem .5rem;margin:0 -.5rem;border-radius:8px;cursor:pointer;font-size:.95rem;transition:background .15s,opacity .25s}
.opt:hover{background:var(--bruma)}
.opt input{position:absolute;opacity:0;pointer-events:none}
.opt__box{width:18px;height:18px;border:1.5px solid #B5C4D4;border-radius:5px;flex:none;display:grid;place-items:center;background:#fff;transition:background .15s,border-color .15s}
.opt input:checked+.opt__box{background:var(--ub);border-color:var(--ub)}
.opt input:checked+.opt__box::after{content:"";width:9px;height:5px;border:2px solid #fff;border-top:0;border-right:0;transform:rotate(-45deg) translate(1px,-1px)}
.opt input:focus-visible+.opt__box{outline:3px solid var(--ub);outline-offset:2px}
.opt__label{flex:1;line-height:1.3}
.opt small{color:var(--suave);font-variant-numeric:tabular-nums;min-width:1.6em;text-align:right}
.opt.is-zero{opacity:.38;cursor:default}
.opt.is-zero:hover{background:none}
.opt.is-extra{display:none}
.facet.is-open .opt.is-extra{display:flex}
.facet__more{margin-top:.5rem;font-size:.9rem}

.price__vals{display:flex;justify-content:space-between;font-weight:600;color:var(--tinta);margin-bottom:.7rem;font-variant-numeric:tabular-nums}
.price__track{position:relative;height:26px}
.price__track::before{content:"";position:absolute;left:0;right:0;top:50%;height:4px;margin-top:-2px;border-radius:4px;background:var(--linea)}
.price__fill{position:absolute;top:50%;height:4px;margin-top:-2px;border-radius:4px;background:var(--ub);left:var(--a,0%);right:var(--b,0%)}
.price input[type=range]{position:absolute;inset:0;width:100%;height:100%;margin:0;background:none;pointer-events:none;-webkit-appearance:none;appearance:none}
.price input[type=range]::-webkit-slider-runnable-track{background:none}
.price input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;pointer-events:auto;width:22px;height:22px;border-radius:50%;background:#fff;border:2px solid var(--ub);box-shadow:0 2px 6px rgba(22,34,74,.25);cursor:grab}
.price input[type=range]::-moz-range-thumb{pointer-events:auto;width:18px;height:18px;border-radius:50%;background:#fff;border:2px solid var(--ub);cursor:grab}
.price input[type=range]::-moz-range-track{background:none}
.price input[type=range]:focus-visible::-webkit-slider-thumb{outline:3px solid var(--ub);outline-offset:2px}

.switch-row{position:relative;display:flex;align-items:center;gap:.8rem;cursor:pointer;font-size:.95rem}
.switch-row>span:first-child{flex:1}
.switch-row input{position:absolute;opacity:0;pointer-events:none}
.switch{width:44px;height:26px;border-radius:99px;background:#C9D3DF;position:relative;flex:none;transition:background .2s}
.switch::after{content:"";position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.25);transition:transform .25s var(--ease)}
.switch-row input:checked~.switch{background:var(--ub)}
.switch-row input:checked~.switch::after{transform:translateX(18px)}
.switch-row input:focus-visible~.switch{outline:3px solid var(--ub);outline-offset:2px}

.toolbar{display:flex;align-items:center;gap:.8rem;margin-bottom:1rem;flex-wrap:wrap}
.toolbar__search{flex:1;min-width:220px;display:flex;align-items:center;gap:.6rem;height:46px;padding:0 1rem;border:1.5px solid var(--linea);border-radius:999px;background:#fff;transition:border-color .2s}
.toolbar__search:focus-within{border-color:var(--ub)}
.toolbar__search svg{width:19px;height:19px;fill:none;stroke:var(--suave);stroke-width:1.8;flex:none}
.toolbar__search input{border:0;flex:1;min-width:0;background:none;height:100%}
.toolbar__search input:focus{outline:none}
.toolbar__sort{display:flex;align-items:center;gap:.6rem;font-size:.92rem;color:var(--suave)}
.toolbar select{height:46px;border:1.5px solid var(--linea);border-radius:999px;padding:0 2.4rem 0 1rem;background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%2356627E' stroke-width='1.6'/%3E%3C/svg%3E") no-repeat right 1rem center/11px;appearance:none;color:var(--texto)}
.toolbar__filters{display:none}
.badge{background:var(--ub);color:#fff;border-radius:99px;font-size:.75rem;min-width:20px;height:20px;display:inline-grid;place-items:center;padding:0 6px}
.chips{display:flex;flex-wrap:wrap;gap:.45rem;margin-bottom:1.6rem}
.chips:empty{margin:0}
.chip{display:inline-flex;align-items:center;gap:.5rem;height:34px;padding:0 .85rem;border-radius:99px;border:1.5px solid var(--cielo);background:var(--bruma);color:var(--tinta);font-size:.88rem;cursor:pointer;animation:chipIn .3s var(--ease)}
.chip span{font-size:.7rem;color:var(--suave)}
.chip:hover{border-color:var(--ub)}
.chip--clear{background:none;border-color:transparent;color:var(--ub-osc);font-weight:600;text-decoration:underline;text-underline-offset:3px}
@keyframes chipIn{from{opacity:0;transform:scale(.9)}}

.grid--catalog{grid-template-columns:repeat(auto-fill,minmax(170px,1fr));transition:opacity .25s}
.grid[aria-busy="true"]{opacity:.4;pointer-events:none}
.book.is-new{animation:cardIn .5s var(--ease) both;animation-delay:calc(var(--k,0) * 35ms)}
@keyframes cardIn{from{opacity:0;transform:translateY(14px)}}
.more{display:grid;justify-items:center;gap:.8rem;margin-top:3rem;color:var(--suave);font-size:.92rem}
.more p{margin:0}
.more__bar{width:220px;height:4px;border-radius:4px;background:var(--linea);overflow:hidden}
.more__bar i{display:block;height:100%;background:var(--ub);border-radius:inherit;transition:width .5s var(--ease)}
.empty{text-align:center;padding:4rem 1rem;max-width:560px;margin:0 auto}
.empty--grid{grid-column:1/-1}
.empty h1,.empty h2{font-family:var(--serif);font-weight:400;font-size:clamp(1.6rem,3vw,2.3rem);line-height:1.15;margin:0 0 .8rem;color:var(--tinta)}
.empty p{color:var(--suave);margin:0 0 1.6rem}
.empty__actions{display:flex;gap:.6rem;justify-content:center;flex-wrap:wrap}
.empty--page{padding-block:7rem}
@media (max-width:860px){
  .catalog{grid-template-columns:1fr;gap:0}
  .filters{position:fixed;inset:0;z-index:65;background:var(--papel);transform:translateX(-100%);visibility:hidden;transition:transform .4s var(--ease),visibility .4s}
  .filters.is-open{transform:none;visibility:visible}
  .filters form{position:static;max-height:none;height:100%;overflow-y:auto;padding:0 1.25rem 7rem}
  .filters__head{display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:2;background:var(--papel);padding:1rem 0;border-bottom:1px solid var(--linea)}
  .filters__head h2{font-family:var(--serif);font-weight:400;margin:0;font-size:1.5rem}
  .filters__foot{display:grid;grid-template-columns:1fr 1.5fr;gap:.6rem;position:fixed;left:0;right:0;bottom:0;padding:.8rem 1.25rem calc(.8rem + env(safe-area-inset-bottom));background:#fff;border-top:1px solid var(--linea)}
  .toolbar__filters{display:inline-flex}
  .toolbar__search{order:-1;flex-basis:100%}
  .toolbar__sort{margin-left:auto}
  .toolbar__sort span{display:none}
}

/* =========================================================
   Ficha de libro
   ========================================================= */
.product{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(2rem,6vw,5rem);padding-block:2rem 4rem;align-items:start}
.product__visual{position:sticky;top:100px}
.product__stage{background:radial-gradient(70% 60% at 50% 40%, var(--cielo), var(--bruma) 70%);border-radius:var(--r-l);aspect-ratio:1/1.05;display:grid;place-items:center;perspective:1200px;overflow:hidden}
.product__book{width:min(58%,330px);aspect-ratio:2/3;transform-style:preserve-3d;transform:rotateY(var(--ry,-16deg)) rotateX(var(--rx,4deg));transition:transform .5s var(--ease);position:relative;animation:enter 1.1s var(--ease) both}
@keyframes enter{from{transform:rotateY(-60deg) translateX(-30px);opacity:0}}
.product__book::after{content:"";position:absolute;top:2%;bottom:2%;right:-14px;width:14px;transform:rotateY(90deg);transform-origin:left;background:repeating-linear-gradient(#fff 0 2px,#E5ECF3 2px 3px)}
.product__book .cover{box-shadow:24px 30px 50px -18px rgba(22,34,74,.55)}
.thumbs{display:flex;gap:.6rem;margin-top:1rem;justify-content:center}
.thumbs__btn{width:64px;aspect-ratio:2/3;padding:0;border:2px solid transparent;border-radius:6px;overflow:hidden;cursor:pointer;background:none}
.thumbs__btn[aria-pressed="true"]{border-color:var(--ub)}
.thumbs__btn img{width:100%;height:100%;object-fit:cover}
.product__ed{display:inline-block;color:var(--ub-osc);font-weight:600;text-decoration:none;margin-top:.4rem}
.product__title{font-family:var(--serif);font-weight:400;font-size:clamp(2.1rem,4.4vw,3.5rem);line-height:1.03;letter-spacing:-.015em;margin:.5rem 0 .6rem;color:var(--tinta)}
.product__author{font-size:1.12rem;color:var(--suave);margin:0 0 1.8rem}
.product__author a{color:var(--marino);font-weight:600;text-underline-offset:3px}
.product__price{display:flex;align-items:baseline;gap:.8rem}
.product__price strong{font-size:2.1rem;color:var(--tinta)}
.product__price s{color:var(--suave)}
.stock{display:flex;align-items:center;gap:.5rem;margin:.4rem 0 1.6rem;color:var(--ok);font-weight:500}
.stock::before{content:"";width:8px;height:8px;border-radius:50%;background:currentColor}
.stock--low{color:#B26A00}.stock--out{color:var(--alerta)}
.buy{display:flex;gap:.7rem;margin-bottom:.7rem}
.product__desc{margin-top:2rem;line-height:1.7;max-width:62ch}
.specs{margin:2.2rem 0 0;display:grid;grid-template-columns:repeat(2,1fr);border-top:1px solid var(--linea)}
.specs div{padding:.85rem 0;border-bottom:1px solid var(--linea)}
.specs dt{font-size:.8rem;color:var(--suave)}
.specs dd{margin:0;font-weight:500}
.sticky-buy{position:fixed;left:0;right:0;bottom:0;z-index:35;background:#fff;border-top:1px solid var(--linea);display:none;align-items:center;gap:1rem;padding:.7rem 1.25rem calc(.7rem + env(safe-area-inset-bottom));transform:translateY(100%);transition:transform .35s var(--ease)}
.sticky-buy.is-on{transform:none}
.sticky-buy__info{flex:1;min-width:0;display:grid}
.sticky-buy__info strong{font-family:var(--serif);font-weight:400;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* Ficha: extras */
[data-zoom]{cursor:zoom-in}
.zoom-hint{text-align:center;font-size:.82rem;color:var(--suave);margin:.7rem 0 0}
.product__desc h2{font-family:var(--serif);font-weight:400;font-size:1.4rem;margin:0 0 .6rem;color:var(--tinta)}
.ship-est{margin-top:1.6rem;padding:1.1rem 1.2rem;border:1px solid var(--linea);border-radius:var(--r-m);background:#fff;display:grid;gap:.6rem}
.ship-est label{display:flex;align-items:center;gap:.55rem;font-weight:600;color:var(--tinta)}
.ship-est svg{width:22px;height:22px;fill:none;stroke:var(--ub);stroke-width:1.7;stroke-linejoin:round}
.ship-est select{border:1.5px solid var(--linea);border-radius:var(--r-s);padding:.65rem .8rem;background:#fff;min-height:46px}
.ship-est__out{margin:0;font-size:.93rem;color:var(--suave)}
.ship-est__out strong{color:var(--tinta)}
.ship-est__out span{display:block;margin-top:.2rem}
.share{display:flex;align-items:center;gap:.5rem;margin-top:1.2rem;flex-wrap:wrap;font-size:.9rem;color:var(--suave)}
.share span{margin-right:.2rem}
.share__btn{border:1.5px solid var(--linea);background:#fff;border-radius:99px;padding:.4rem .9rem;text-decoration:none;color:var(--marino);font-weight:600;cursor:pointer;font-size:.88rem}
.share__btn:hover{border-color:var(--ub)}
.trust{list-style:none;margin:2rem 0 0;padding:0;display:grid;gap:.55rem;font-size:.93rem;color:var(--suave)}
.trust li{padding-left:1.6rem;position:relative}
.trust li::before{content:"";position:absolute;left:0;top:.35rem;width:14px;height:8px;border:2px solid var(--ok);border-top:0;border-right:0;transform:rotate(-45deg)}
.trust strong{color:var(--tinta);font-weight:600}
.rail--small{grid-auto-columns:clamp(130px,13vw,160px)}
.section--recent{padding-top:0}
.lightbox{border:0;padding:0;max-width:none;max-height:none;width:100vw;height:100vh;background:rgba(10,16,38,.95);color:#fff;display:none;place-items:center}
.lightbox[open]{display:grid}
.lightbox::backdrop{background:transparent}
.lightbox img{max-width:min(92vw,900px);max-height:84vh;object-fit:contain;border-radius:4px;box-shadow:0 30px 60px rgba(0,0,0,.5);animation:lbIn .35s var(--ease)}
@keyframes lbIn{from{opacity:0;transform:scale(.96)}}
.lightbox__close,.lightbox__nav{position:fixed;border:0;background:rgba(255,255,255,.12);color:#fff;width:52px;height:52px;border-radius:50%;cursor:pointer;font-size:1.2rem}
.lightbox__close:hover,.lightbox__nav:hover{background:rgba(255,255,255,.25)}
.lightbox__close{top:1.2rem;right:1.2rem}
.lightbox__nav--prev{left:1.2rem;top:50%;transform:translateY(-50%)}
.lightbox__nav--next{right:1.2rem;top:50%;transform:translateY(-50%)}
.lightbox__count{position:fixed;bottom:1.2rem;left:0;right:0;text-align:center;margin:0;color:#C4D3E6;font-size:.9rem}

/* Páginas informativas */
.info{display:grid;grid-template-columns:240px 1fr;gap:4rem;padding-bottom:5rem}
.info__nav{position:sticky;top:100px;align-self:start;display:grid;gap:.15rem;padding-top:4.4rem}
.info__nav h2{font-family:var(--serif);font-weight:400;font-size:1.2rem;margin:0 0 .5rem;color:var(--tinta)}
.info__nav a{text-decoration:none;padding:.5rem .8rem;margin-left:-.8rem;border-radius:8px;color:var(--suave)}
.info__nav a:hover{background:var(--bruma);color:var(--tinta)}
.info__nav a[aria-current]{background:var(--bruma);color:var(--tinta);font-weight:600}
.prose{max-width:68ch;line-height:1.75;font-size:1.03rem}
.prose h2{font-family:var(--serif);font-weight:400;font-size:1.6rem;color:var(--tinta);margin:2.4rem 0 .6rem;line-height:1.2}
.prose h3{font-size:1.1rem;margin:1.6rem 0 .4rem;color:var(--tinta)}
.prose p,.prose ul,.prose ol{margin:0 0 1rem}
.prose li{margin-bottom:.35rem}
.prose a{color:var(--ub-osc);text-underline-offset:3px}
.info__date{color:var(--suave);font-size:.85rem;margin-top:2rem}
.info__help{margin-top:2rem;padding:1.4rem;border-radius:var(--r-m);background:var(--cielo);display:flex;gap:1rem;align-items:center;justify-content:space-between;flex-wrap:wrap;max-width:68ch}
.info__help p{margin:0;color:var(--tinta)}

/* Seguimiento */
.track{max-width:760px;padding-bottom:5rem}
.track__lead{color:var(--suave);max-width:56ch}
.track__form{display:grid;grid-template-columns:1fr 1fr auto;gap:1rem;align-items:end;margin-top:1.4rem}
.track__status{background:var(--tinta);color:#fff;border-radius:var(--r-l);padding:1.8rem 2rem}
.track__status.is-cancel{background:#5C2A20}
.track__status h2{font-family:var(--serif);font-weight:400;font-size:2rem;margin:.3rem 0;color:var(--cielo)}
.track__status p{margin:0;color:#C4D3E6}
.track__code strong{color:#fff}
.track__guide{margin-top:.8rem!important;color:#fff!important}
.steps{list-style:none;margin:2.4rem 0;padding:0;display:grid;grid-template-columns:repeat(5,1fr);position:relative}
.steps::before{content:"";position:absolute;top:9px;left:10%;right:10%;height:3px;background:var(--linea)}
.steps::after{content:"";position:absolute;top:9px;left:10%;height:3px;background:var(--ok);width:calc(var(--done) * 20%);transition:width 1s var(--ease)}
.steps li{display:grid;justify-items:center;text-align:center;gap:.3rem;position:relative;z-index:1;font-size:.88rem;padding:0 .3rem}
.steps__dot{width:21px;height:21px;border-radius:50%;background:#fff;border:3px solid var(--linea)}
.steps .is-done .steps__dot{background:var(--ok);border-color:var(--ok)}
.steps .is-current .steps__dot{border-color:var(--ok);box-shadow:0 0 0 5px rgba(30,142,98,.18);animation:pulse 2s infinite}
@keyframes pulse{50%{box-shadow:0 0 0 9px rgba(30,142,98,.05)}}
.steps strong{color:var(--tinta);font-weight:600;line-height:1.25}
.steps li:not(.is-done):not(.is-current) strong{color:var(--suave);font-weight:500}
.steps small{color:var(--suave);font-size:.78rem}
.consent{display:flex;gap:.7rem;align-items:flex-start;font-size:.86rem;line-height:1.45;color:var(--suave);cursor:pointer}
.consent input{accent-color:var(--ub);width:18px;height:18px;margin-top:.1rem;flex:none}
.consent a{color:var(--ub-osc)}
.consent.is-error{color:var(--alerta)}
@media (max-width:860px){
  .info{grid-template-columns:1fr;gap:0}
  .info__nav{position:static;order:2;padding-top:2rem;border-top:1px solid var(--linea);margin-top:2rem}
  .track__form{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr;gap:1rem;padding-left:.3rem}
  .steps::before{top:0;bottom:0;left:13px;right:auto;width:3px;height:auto}
  .steps::after{top:0;left:13px;width:3px;height:calc(var(--done) * 25%)}
  .steps li{grid-template-columns:auto 1fr;justify-items:start;text-align:left;column-gap:.8rem}
  .steps li small{grid-column:2}
  .steps__dot{grid-row:span 2}
}

/* =========================================================
   Carrito y checkout
   ========================================================= */
.page-title{font-family:var(--serif);font-weight:400;font-size:clamp(2rem,4.5vw,3.2rem);line-height:1.05;color:var(--tinta);margin:2rem 0 1.6rem;letter-spacing:-.015em}
.cart-page{padding-bottom:5rem}
.cart-page__grid,.checkout__grid{display:grid;grid-template-columns:1fr 380px;gap:3rem;align-items:start}
.cart-lines{list-style:none;margin:0;padding:0;border-top:1px solid var(--linea)}
.cart-line{display:grid;grid-template-columns:80px 1fr auto auto auto;gap:1.2rem;align-items:center;padding:1.2rem 0;border-bottom:1px solid var(--linea)}
.cart-line__cover{aspect-ratio:2/3;display:block}
.cart-line__title{font-family:var(--serif);font-size:1.12rem;text-decoration:none;display:block;line-height:1.2}
.cart-line__author,.cart-line__unit{display:block;font-size:.88rem;color:var(--suave)}
.cart-line__sub{min-width:90px;text-align:right}
.summary{background:#fff;border:1px solid var(--linea);border-radius:var(--r-m);padding:1.5rem;display:grid;gap:.8rem}
.summary--sticky{position:sticky;top:100px}
.summary h2{font-family:var(--serif);font-weight:400;margin:0 0 .4rem;font-size:1.4rem}
.summary__row{display:flex;justify-content:space-between;gap:1rem}
.summary__row--total{border-top:1px solid var(--linea);padding-top:.9rem;font-size:1.2rem}
.summary__items{list-style:none;margin:0;padding:0;display:grid;gap:.8rem;max-height:320px;overflow-y:auto}
.summary__items li{display:grid;grid-template-columns:40px 1fr auto;gap:.8rem;align-items:center;font-size:.92rem;line-height:1.25}
.summary__items small{display:block;color:var(--suave)}
.summary__cover{aspect-ratio:2/3;display:block}
.summary__cover .cover--gen{padding:0}.summary__cover .cover--gen>*{display:none}
.summary__note{font-size:.84rem;color:var(--suave);margin:0}
.checkout{padding-bottom:5rem}
.checkout fieldset{border:0;padding:0;margin:0 0 2.2rem;display:grid;grid-template-columns:1fr 1fr;gap:1rem 1.2rem}
.checkout legend{font-family:var(--serif);font-size:1.4rem;color:var(--tinta);margin-bottom:1rem;padding:0}
.field{display:grid;gap:.35rem}
.field--full{grid-column:1/-1}
.field label{font-weight:500;font-size:.93rem}
.field label small{color:var(--suave);font-weight:400}
.field input,.field select,.field textarea{border:1.5px solid var(--linea);border-radius:var(--r-s);padding:.75rem .85rem;background:#fff;min-height:48px;width:100%}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--ub);box-shadow:0 0 0 3px rgba(55,127,160,.18)}
.field [aria-invalid="true"]{border-color:var(--alerta)}
.field__err{color:var(--alerta);font-size:.85rem;grid-column:1/-1}
.pay{grid-column:1/-1;display:grid;gap:.6rem}
.pay__opt{display:flex;gap:.9rem;align-items:flex-start;border:1.5px solid var(--linea);border-radius:var(--r-m);padding:1rem 1.1rem;cursor:pointer;background:#fff;transition:border-color .2s,background .2s}
.pay__opt:has(input:checked){border-color:var(--ub);background:var(--bruma)}
.pay__opt input{accent-color:var(--ub);margin-top:.25rem;width:18px;height:18px}
.pay__opt small{display:block;color:var(--suave)}
.pay__opt.is-disabled{opacity:.45;pointer-events:none}
.alert{padding:.9rem 1.1rem;border-radius:var(--r-s);margin:0 0 1.2rem}
.alert--error{background:#FBEDE9;color:#8C2F1C}
.alert--warn{background:#FFF4DE;color:#7A4B00}

/* Confirmación */
.done{max-width:640px;text-align:center;padding:3rem 0 5rem;display:grid;gap:1rem;justify-items:center}
.done .page-title{margin:0}
.done__mark svg{width:84px;height:84px;fill:none;stroke:var(--ok);stroke-width:2.5;stroke-linecap:round;stroke-linejoin:round}
.done__mark circle{stroke-dasharray:151;stroke-dashoffset:151;animation:draw .8s var(--ease) forwards}
.done__mark path{stroke-dasharray:40;stroke-dashoffset:40;animation:draw .5s .6s var(--ease) forwards}
@keyframes draw{to{stroke-dashoffset:0}}
.done__code{font-size:1.2rem;margin:0}
.done__code strong{font-family:var(--serif);font-weight:400;font-size:1.5rem;color:var(--tinta);letter-spacing:.03em}
.done__box{background:#fff;border:1px solid var(--linea);border-radius:var(--r-m);padding:1.4rem;text-align:left;width:100%}
.done__box h2{font-family:var(--serif);font-weight:400;margin:0 0 .4rem}
.done__total{margin-bottom:0}
.done__table{width:100%;border-collapse:collapse;text-align:left;margin-top:1rem}
.done__table th,.done__table td{padding:.65rem .4rem;border-bottom:1px solid var(--linea)}
.done__table td:last-child,.done__table th:last-child{text-align:right}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width:1080px){
  .main-nav{display:none}
  .menu-trigger{display:block}
  .search-trigger{min-width:0}
  .search-trigger span,.search-trigger kbd{display:none}
  .search-trigger{width:46px;padding:0;justify-content:center;border-radius:50%}
  .site-header__in{justify-content:space-between}
  .cats{grid-template-columns:repeat(2,1fr)}
  .cats li:not(:nth-child(4n)){border-right:0}
  .cats li:nth-child(odd){border-right:1px solid var(--linea)}
}
@media (max-width:860px){
  .hero__copy{grid-template-columns:1fr;gap:1.6rem}
  .promise__in{grid-template-columns:1fr;gap:1rem}
  .author__in{grid-template-columns:1fr}
  .fan{height:340px}
  .cta-wa__in{grid-template-columns:1fr;text-align:left}
  .site-footer__grid{grid-template-columns:1fr 1fr}
  .site-footer__brand{grid-column:1/-1}
  .product{grid-template-columns:1fr}
  .product__visual{position:static}
  .sticky-buy{display:flex}
  .cart-page__grid,.checkout__grid{grid-template-columns:1fr}
  .summary--sticky{position:static}
  .cart-line{grid-template-columns:64px 1fr auto;grid-template-areas:"c i i" "c q s" "c r r"}
  .cart-line__cover{grid-area:c}.cart-line__info{grid-area:i}.cart-line .qty{grid-area:q}.cart-line__sub{grid-area:s}.cart-line .link{grid-area:r;justify-self:start}
}
@media (max-width:560px){
  .wrap{width:calc(100% - 2rem)}
  .brand__name{display:none}
  .grid,.grid--catalog{grid-template-columns:repeat(2,1fr);gap:1.8rem 1rem}
  .toolbar__search{min-width:0}
  .checkout fieldset{grid-template-columns:1fr}
  .specs{grid-template-columns:1fr}
  .site-footer__grid{grid-template-columns:1fr}
  .hero__search .btn{padding-inline:1rem}
  .wa-float{bottom:5.2rem}
  .page-book .wa-float{bottom:6rem}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
  .shelf__row{overflow-x:auto;clip-path:none}
  .shelf__track{animation:none}
  .shelf__track > [aria-hidden="true"]{display:none}
}
@media (max-width:560px){
  .toolbar{gap:.6rem}
  .toolbar__sort{flex:1;margin-left:0}
  .toolbar select{width:100%;padding-right:2rem}
  .info__help{flex-direction:column;align-items:flex-start}
}
.track .empty__actions{margin-top:2rem}

/* Pago en línea */
.pay__opt--main{border-color:var(--ub)}
.pay__brands{display:flex;flex-wrap:wrap;gap:.3rem;margin-top:.5rem}
.pay__brands i{font-style:normal;font-size:.7rem;font-weight:700;letter-spacing:.02em;border:1px solid var(--linea);border-radius:5px;padding:.1rem .4rem;color:var(--marino);background:#fff}
.done__mark--wait svg{stroke:#B26A00}
.done__mark--x svg{stroke:var(--alerta)}
.done__box--pay{display:grid;gap:.8rem;border-color:var(--ub);box-shadow:0 18px 40px -24px rgba(22,34,74,.45)}
.done__box--pay h2{font-size:1.5rem}
.done__box--pay p{margin:0}
.pay-note{display:flex;gap:.5rem;align-items:center;font-size:.84rem;color:var(--suave)}
.pay-note svg{width:18px;height:18px;flex:none;fill:none;stroke:var(--ok);stroke-width:1.8}
.pay-test{font-size:.82rem;color:#7A4B00;background:#FFF4DE;border-radius:6px;padding:.4rem .7rem}
.pay-msg{color:var(--alerta);font-size:.9rem}
.pay-msg:empty{display:none}
.track__pay{margin-top:1rem}

/* Color por categoría */
.cover--gen.is-cat{background:var(--bg);color:var(--fg)}
.spine:not([class*=" p"]){background:var(--bg,var(--marino));color:var(--fg,var(--cielo))}
.opt__dot{width:10px;height:10px;border-radius:50%;flex:none;box-shadow:inset 0 0 0 1px rgba(0,0,0,.12)}
.cats a.has-color::after{content:"";position:absolute;left:0;top:0;bottom:0;width:6px;background:var(--bg);transition:width .45s var(--ease)}
.cats a.has-color::before{background:var(--bg)}
.cats a.has-color:hover{color:var(--fg)}
.cats a.has-color:hover small{color:var(--fg);opacity:.8}