/* FormacionTech · Sección del libro «De los Datos Brutos a los Agentes»
   La slide resumen usa la identidad del libro (azul #1F3864 y Arial). Es HTML real:
   se escala como un lienzo 16:9 de 1280×720 con unidades de contenedor y, en pantallas
   estrechas, pasa a ficha de altura natural. Sin JavaScript. */
:root{--lb-navy:#1F3864;--lb-deep:#162A4C;--lb-steel:#3B749F;--lb-soft:#D7E4EF;--lb-mist:#F1F5F9;--lb-ink:#18233A;--lb-muted:#56667C;--lb-rule:#C8D5E2;--lb-on:#B9CCE0;--lb-font:Arial,"Helvetica Neue",Helvetica,sans-serif}

/* ---------- Indicador de nivel (tres barras, como en el libro) ---------- */
.lv{display:inline-flex;align-items:center;gap:.5em;font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:.72rem;white-space:nowrap}
.lv i{display:inline-flex;gap:2px;align-items:flex-end}
.lv i b{width:4px;border-radius:1px;background:currentColor;opacity:.28}
.lv i b:nth-child(1){height:6px}.lv i b:nth-child(2){height:9px}.lv i b:nth-child(3){height:12px}
.lv[data-n="1"] i b:nth-child(-n+1),.lv[data-n="2"] i b:nth-child(-n+2),.lv[data-n="3"] i b{opacity:1}

/* ---------- Slide resumen ---------- */
.ls{container-type:inline-size;margin:1.5rem auto 1.25rem;max-width:min(100%,960px)}
.ls-in{--u:calc(100cqw / 1280);aspect-ratio:16/9;display:grid;grid-template-columns:calc(450*var(--u)) 1fr;font-family:var(--lb-font);color:var(--lb-ink);background:#fff;border-radius:calc(12*var(--u));overflow:hidden;box-shadow:0 10px 30px rgba(22,42,76,.14);border:1px solid var(--lb-rule)}
.ls-izq{background:var(--lb-navy);color:#fff;padding:calc(52*var(--u)) calc(48*var(--u)) calc(40*var(--u));display:flex;flex-direction:column;min-width:0}
.ls-parte{margin:0;font-size:calc(15*var(--u));font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--lb-on);line-height:1.35}
.ls-num{margin:calc(46*var(--u)) 0 calc(8*var(--u));font-size:calc(24*var(--u));font-weight:700;color:var(--lb-on)}
.ls-tit{margin:0;font-family:var(--lb-font);font-size:calc(50*var(--u));line-height:1.06;font-weight:700;color:#fff;letter-spacing:-.01em;text-wrap:balance;overflow-wrap:anywhere;hyphens:auto}
.ls-lema{margin:calc(22*var(--u)) 0 0;font-size:calc(19*var(--u));line-height:1.45;color:var(--lb-soft);max-width:calc(350*var(--u))}
.ls-pie-izq{margin-top:auto;display:flex;align-items:flex-end;justify-content:space-between;gap:calc(16*var(--u))}
.ls-pie-izq .lv{font-size:calc(15*var(--u));color:#fff}
.ls-pie-izq .lv i{gap:calc(3*var(--u))}
.ls-pie-izq .lv i b{width:calc(6*var(--u))}
.ls-pie-izq .lv i b:nth-child(1){height:calc(8*var(--u))}.ls-pie-izq .lv i b:nth-child(2){height:calc(13*var(--u))}.ls-pie-izq .lv i b:nth-child(3){height:calc(18*var(--u))}
.ls-pie-izq img{width:calc(64*var(--u));height:auto;background:#fff;border-radius:50%;padding:calc(9*var(--u))}
.ls-der{padding:calc(52*var(--u)) calc(60*var(--u)) calc(34*var(--u));display:flex;flex-direction:column;min-width:0}
.ls-eti{margin:0 0 calc(22*var(--u));padding-bottom:calc(16*var(--u));border-bottom:calc(2*var(--u)) solid var(--lb-navy);font-size:calc(15*var(--u));font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--lb-steel)}
.ls-toc{list-style:none;margin:0;padding:0;display:grid;grid-auto-flow:column;grid-template-columns:1fr;gap:calc(13*var(--u)) calc(34*var(--u));align-content:start}
.ls-toc.dos{grid-template-columns:1fr 1fr;gap:calc(11*var(--u)) calc(30*var(--u))}
.ls-toc li{display:grid;grid-template-columns:calc(52*var(--u)) 1fr;align-items:baseline;font-size:calc(22*var(--u));line-height:1.3;color:var(--lb-ink)}
.ls-toc.dos li{grid-template-columns:calc(62*var(--u)) 1fr;font-size:calc(18.5*var(--u))}
.ls-n{font-weight:700;color:var(--lb-steel);font-variant-numeric:tabular-nums}
.ls-t{font-weight:600;min-width:0}
.ls-pie{margin-top:auto;padding-top:calc(16*var(--u));border-top:1px solid var(--lb-rule);display:flex;justify-content:space-between;align-items:center;gap:calc(20*var(--u))}
.ls-datos{margin:0;font-size:calc(16*var(--u));color:var(--lb-muted)}
.ls-datos b{color:var(--lb-navy)}
.ls-ruta{display:flex;flex-direction:column;align-items:flex-end;gap:calc(6*var(--u));flex:none}
.ls-rl{font-size:calc(13*var(--u));font-weight:700;color:var(--lb-muted);letter-spacing:.04em}
.ls-rt{display:flex;gap:calc(7*var(--u))}
.ls-rp{display:flex;gap:calc(3*var(--u))}
.ls-rp span{width:calc(12*var(--u));height:calc(12*var(--u));border-radius:calc(2*var(--u));background:var(--lb-rule)}
.ls-rp span.ok{background:var(--lb-soft)}
.ls-rp span.on{background:var(--lb-navy)}

/* Ficha en pantallas estrechas */
@container (max-width: 640px){
  .ls-in{--u:1px;aspect-ratio:auto;grid-template-columns:1fr;border-radius:12px}
  .ls-izq{padding:24px 20px 22px}
  .ls-num{margin:18px 0 4px;font-size:16px}
  .ls-tit{font-size:30px}
  .ls-lema{font-size:15px;max-width:none;margin-top:12px}
  .ls-pie-izq{margin-top:18px}
  .ls-pie-izq img{width:46px;padding:6px}
  .ls-der{padding:22px 20px 20px}
  .ls-eti{font-size:12px;margin-bottom:14px;padding-bottom:10px}
  .ls-toc,.ls-toc.dos{grid-template-columns:1fr;grid-auto-flow:row;grid-template-rows:none!important;gap:9px}
  .ls-toc li,.ls-toc.dos li{font-size:15.5px;grid-template-columns:44px 1fr}
  .ls-pie{margin-top:18px;flex-direction:column;align-items:flex-start;gap:10px}
  .ls-datos{font-size:13.5px}
  .ls-ruta{align-items:flex-start}
  .ls-rp span{width:10px;height:10px}
}

/* ---------- Página del capítulo ---------- */
.lb-migas ol{display:flex;flex-wrap:wrap;gap:.35rem;list-style:none;margin:0 0 1rem;padding:0;font-size:.85rem;color:var(--slate-muted)}
.lb-migas li+li::before{content:"›";margin-right:.35rem;color:var(--slate-light)}
.lb-migas a{color:var(--blue);text-decoration:none}
.lb-migas a:hover{text-decoration:underline}
.lb-obj{border:1px solid var(--border);border-radius:var(--radius);background:var(--off-white);padding:0 1.25rem;margin:0 0 1.75rem}
.lb-obj summary{cursor:pointer;font-weight:700;padding:1rem 0;color:var(--navy)}
.lb-obj summary span{color:var(--slate-muted);font-weight:500}
.lb-obj ul{margin:0 0 1.25rem 1.1rem;color:var(--slate);display:grid;gap:.45rem}
.lb-capnav{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin:0 0 2rem}
.lb-capnav a{display:block;padding:1rem 1.2rem;border:1px solid var(--border);border-radius:var(--radius);text-decoration:none;color:var(--navy);background:var(--white);transition:border-color .2s,box-shadow .2s}
.lb-capnav a:hover{border-color:var(--blue-light);box-shadow:var(--shadow-sm)}
.lb-capnav a.sig{text-align:right}
.lb-capnav small{display:block;color:var(--slate-muted);font-size:.78rem;margin-bottom:.2rem}
.lb-capnav b{font-size:.95rem}

/* ---------- Caja de compra ---------- */
.lb-compra{display:flex;justify-content:space-between;align-items:center;gap:1.25rem 2rem;flex-wrap:wrap;margin:2.5rem 0 1rem;padding:1.6rem 1.9rem;border-radius:var(--radius);background:linear-gradient(135deg,var(--lb-navy),var(--lb-deep));color:#fff}
.lb-compra.compacta{margin-top:0}
.lb-compra-t{font-family:'Fraunces',serif;font-size:1.2rem;font-weight:700;margin:0}
.lb-compra-s{margin:.3rem 0 0;color:var(--lb-soft);font-size:.92rem}
.lb-compra-acc{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.lb-precio{margin:0;font-size:1.6rem;font-weight:700;line-height:1}
.lb-precio small{display:block;font-size:.72rem;font-weight:500;color:var(--lb-on);margin-top:.25rem}

/* ---------- Portada /libro/ ---------- */
.lb-hero{display:grid;grid-template-columns:minmax(200px,260px) 1fr;gap:2.5rem;align-items:center;margin:1.75rem 0 2.5rem}
.lb-portada{aspect-ratio:2/3;border-radius:6px 14px 14px 6px;background:linear-gradient(160deg,var(--lb-navy),var(--lb-deep));color:#fff;padding:1.6rem 1.4rem;display:flex;flex-direction:column;font-family:var(--lb-font);box-shadow:inset 6px 0 0 rgba(255,255,255,.08),var(--shadow-lg)}
.lb-portada img{width:58px;height:auto;background:#fff;border-radius:50%;padding:8px}
.lb-portada-t{font-size:1.65rem;font-weight:700;line-height:1.08;margin:1.4rem 0 0}
.lb-portada-a{margin:auto 0 .3rem;font-size:.95rem;color:var(--lb-soft)}
.lb-portada-s{margin:0;font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--lb-on)}
.lb-hero-txt h2{font-family:'Fraunces',serif;font-size:1.55rem;line-height:1.25;margin-bottom:.8rem}
.lb-hero-txt p{color:var(--slate)}
.lb-niveles{list-style:none;margin:1.1rem 0 1.4rem;padding:0;display:grid;gap:.45rem;color:var(--slate);font-size:.92rem}
.lb-niveles .lv{color:var(--lb-navy);min-width:11.5rem}
.lb-hero-acc{display:flex;gap:.75rem;flex-wrap:wrap}
.lb-incluye h2,.lb-indice h2{font-family:'Fraunces',serif;font-size:1.4rem;margin-bottom:1rem}
.lb-incluye ul{list-style:none;padding:0;margin:0 0 2.75rem;display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:1rem}
.lb-incluye li{border:1px solid var(--border);border-radius:var(--radius);padding:1.1rem 1.2rem;background:var(--off-white)}
.lb-incluye b{display:block;color:var(--navy);margin-bottom:.3rem}
.lb-incluye span{color:var(--slate);font-size:.9rem}
.lb-nota{color:var(--slate);margin:-.5rem 0 1.5rem}
.lb-partes{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1rem}
.lb-parte{border:1px solid var(--border);border-top:4px solid var(--lb-navy);border-radius:var(--radius);padding:1.1rem 1.15rem .7rem;background:var(--white);display:flex;flex-direction:column}
.lb-rom{font-size:.72rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--lb-steel)}
.lb-parte h3{font-size:1.05rem;color:var(--navy);line-height:1.3;margin-top:.15rem}
.lb-lema{color:var(--slate-muted);font-size:.84rem;margin:.3rem 0 .6rem;line-height:1.45}
.lb-caps{list-style:none;padding:0;margin:0}
.lb-caps li+li{border-top:1px solid var(--border)}
.lb-cap{display:grid;grid-template-columns:2rem 1fr auto;gap:.6rem;align-items:center;padding:.65rem .35rem;margin:0 -.35rem;border-radius:10px;text-decoration:none;color:var(--navy);transition:background .2s}
.lb-cap:hover{background:var(--lb-mist)}
.lb-cap-n{width:2rem;height:2rem;border-radius:50%;background:var(--lb-navy);color:#fff;font-weight:700;font-size:.85rem;display:grid;place-items:center;font-variant-numeric:tabular-nums}
.lb-cap-c{display:flex;flex-direction:column;gap:.2rem;min-width:0}
.lb-cap-t{font-weight:700;font-size:.95rem;line-height:1.3}
.lb-cap-m{display:flex;gap:.65rem;align-items:center;flex-wrap:wrap;color:var(--slate-muted);font-size:.78rem}
.lb-cap-m .lv{color:var(--lb-navy);font-size:.66rem}
.lb-cap-v{color:var(--blue);font-weight:700}
.lb-legal{margin-top:1.75rem;font-size:.8rem;color:var(--slate-muted)}
@media (prefers-reduced-motion:reduce){.lb-cap{transition:none}}

/* ---------- Comprar y descargar ---------- */
.lb-buy{display:grid;grid-template-columns:1.2fr 1fr;gap:2rem;align-items:start;margin:1.5rem 0 2.5rem}
.lb-buy-card{border:1px solid var(--border);border-radius:var(--radius);padding:1.75rem;box-shadow:var(--shadow-md);background:var(--white)}
.lb-buy-card .lb-precio{color:var(--lb-navy);font-size:2.3rem}
.lb-buy-card .lb-precio small{color:var(--slate-muted);font-size:.85rem}
.lb-buy-card ul{margin:1.1rem 0 1.25rem 1.1rem;color:var(--slate);display:grid;gap:.4rem}
.lb-check{display:flex;gap:.65rem;align-items:flex-start;font-size:.88rem;color:var(--slate);margin:1rem 0 1.25rem}
.lb-check input{margin-top:.25rem;width:1.1rem;height:1.1rem;flex:none;accent-color:var(--lb-navy)}
.lb-buy-card .btn{width:100%;justify-content:center}
.lb-pago{font-size:.8rem;color:var(--slate-muted);margin-top:.8rem;text-align:center}
.lb-aviso{padding:1rem 1.2rem;border-radius:10px;background:#fef3c7;border:1px solid #fcd34d;color:#78350f;font-size:.92rem;margin-bottom:1rem}
.lb-ok{padding:1rem 1.2rem;border-radius:10px;background:#d1fae5;border:1px solid #6ee7b7;color:#065f46;font-size:.95rem;margin-bottom:1rem}
.lb-cond{border-top:1px solid var(--border);padding-top:1.75rem;margin-top:1rem}
.lb-cond h2{font-family:'Fraunces',serif;font-size:1.3rem;margin-bottom:.9rem}
.lb-cond h3{font-size:1rem;margin:1.2rem 0 .35rem;color:var(--navy)}
.lb-cond p,.lb-cond li{color:var(--slate);font-size:.92rem}
.lb-cond ul{margin:.3rem 0 0 1.1rem}
.lb-form{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.8rem}
.lb-form input[type=email]{flex:1 1 240px;padding:.75rem .9rem;border:1px solid var(--border);border-radius:10px;font:inherit}
@media (max-width:820px){.lb-hero,.lb-buy{grid-template-columns:1fr}.lb-portada{max-width:220px}.lb-capnav{grid-template-columns:1fr}.lb-capnav a.sig{text-align:left}}
@media (max-width:480px){.lb-compra{padding:1.3rem 1.2rem}.lb-partes{grid-template-columns:1fr}}