/* Apuntes Empresariales · hoja de estilos (manual de identidad, octubre 2026) */
@font-face{font-family:"Source Serif 4";src:url("../fonts/source-serif-4-latin-wght-normal.woff2") format("woff2");font-weight:200 900;font-style:normal;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url("../fonts/source-serif-4-latin-wght-italic.woff2") format("woff2");font-weight:200 900;font-style:italic;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url("../fonts/source-sans-3-latin-wght-normal.woff2") format("woff2");font-weight:200 900;font-style:normal;font-display:swap}

:root{
  --azul:#005983;--rojo:#FB2F02;--profundo:#00384F;--crema:#FAF7F2;--tinta:#17262E;--gris:#5A6A73;--bruma:#E8F1F6;--linea:#DDE2E5;--blanco:#fff;
  --serif:"Source Serif 4",Georgia,serif;--sans:"Source Sans 3",Calibri,"Segoe UI",sans-serif;
  --h1:clamp(2.1rem,3.6vw + .8rem,3.5rem);--h2:clamp(1.75rem,2.4vw + 1rem,2.75rem);--h3:1.5rem;
  --ancho:1200px;--radio:6px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--crema);color:var(--tinta);font-family:var(--sans);font-size:18px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--azul)}
h1,h2,h3{font-family:var(--serif);font-weight:700;line-height:1.1;margin:0}
p{margin:0 0 1em}
:focus-visible{outline:3px solid var(--rojo);outline-offset:3px;border-radius:2px}
.oscuro :focus-visible{outline-color:#fff}
.salto{position:absolute;left:-999px;top:8px;background:#fff;color:var(--profundo);padding:10px 16px;z-index:100;border-radius:var(--radio)}
.salto:focus{left:8px}
.contenedor{max-width:var(--ancho);margin:0 auto;padding:0 32px}

/* Botones */
.btn{display:inline-block;font:600 19px/1 var(--sans);padding:18px 32px;border-radius:var(--radio);border:0;cursor:pointer;text-decoration:none;transition:transform .2s ease,box-shadow .2s ease,background .2s ease}
.btn-rojo{background:var(--rojo);color:#fff;box-shadow:0 0 0 6px rgba(251,47,2,.16),0 14px 30px rgba(251,47,2,.32)}
.btn-rojo:hover{transform:translateY(-2px);box-shadow:0 0 0 8px rgba(251,47,2,.2),0 18px 36px rgba(251,47,2,.4)}
.btn-azul{background:var(--azul);color:#fff}
.btn-azul:hover{background:var(--profundo)}
.enlace{font-weight:600;text-decoration:none;border-bottom:2px solid currentColor;padding-bottom:2px}
.oscuro .enlace{color:#fff;border-color:rgba(255,255,255,.6)}

/* Secciones claras y oscuras */
.oscuro{color:#fff;background:radial-gradient(60% 70% at 15% 0%,rgba(0,112,159,.7),rgba(0,56,79,0) 65%),var(--profundo)}
.oscuro h1,.oscuro h2,.oscuro h3{color:#fff}
.oscuro .suave{color:#d8eaf4}
.claro{background:var(--crema)}.blanco{background:#fff}
.seccion{padding:96px 0}
.etiqueta{margin:0 0 14px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;font-size:14px;color:var(--gris)}
.etiqueta.roja{color:var(--rojo)}
.filete{width:56px;height:4px;background:var(--rojo);margin-bottom:22px}
h2{font-size:var(--h2)}
.lectura{max-width:70ch}

/* Portada */
.portada{position:relative;overflow:hidden;color:#fff;background:var(--profundo)}
.portada .luz{position:absolute;inset:-25%;background:radial-gradient(38% 46% at 78% 22%,#00709f 0%,rgba(0,89,131,.55) 45%,rgba(0,56,79,0) 100%),radial-gradient(26% 32% at 8% 92%,rgba(251,47,2,.30),rgba(251,47,2,0) 100%);animation:deriva 26s ease-in-out infinite alternate;will-change:transform}
@keyframes deriva{from{transform:translate3d(0,0,0) scale(1)}to{transform:translate3d(-4%,3%,0) scale(1.07)}}
.portada .aro{position:absolute;border-radius:50%;border:1px solid rgba(255,255,255,.16);pointer-events:none}
.portada .aro.a{right:-180px;top:40px;width:760px;height:760px}
.portada .aro.b{right:-60px;top:160px;width:520px;height:520px;border-color:rgba(255,255,255,.09)}
.portada>*:not(.luz):not(.aro){position:relative}

/* Encabezado */
.cabecera{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;padding:26px 32px;max-width:var(--ancho);margin:0 auto}
.cabecera .marca img{height:46px;width:auto}
.menu{display:flex;flex-wrap:wrap;gap:6px 28px;font-weight:500;font-size:17px}
.menu a{color:#fff;text-decoration:none;padding:6px 0;border-bottom:2px solid transparent}
.menu a:hover,.menu a[aria-current="page"]{border-color:var(--rojo)}
.cabecera .btn-contorno{color:#fff;border:1.5px solid rgba(255,255,255,.55);border-radius:999px;padding:10px 22px;font-weight:600;text-decoration:none;font-size:17px}
.cabecera .btn-contorno:hover{background:rgba(255,255,255,.12)}
.hamburguesa{display:none;background:none;border:1.5px solid rgba(255,255,255,.55);color:#fff;border-radius:6px;padding:10px 14px;font:600 16px var(--sans);cursor:pointer}

/* Héroe */
.heroe{display:flex;flex-wrap:wrap;align-items:center;gap:56px;padding:72px 32px 120px;max-width:var(--ancho);margin:0 auto}
.heroe.interior{padding:56px 32px 88px}
.heroe .texto{flex:1 1 600px;min-width:0}
.pildora{display:inline-block;margin:0 0 22px;border:1px solid rgba(255,255,255,.3);border-radius:999px;padding:6px 16px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;font-size:13px;color:#cfe7f3}
.heroe h1{font-size:var(--h1);line-height:1.05;margin-bottom:26px;background:linear-gradient(180deg,#fff 30%,#a9d6ec 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.heroe .bajada{font-size:1.25rem;max-width:52ch;color:#e3f0f7;margin-bottom:38px}
.acciones{display:flex;flex-wrap:wrap;gap:22px;align-items:center}

/* Marco de foto */
.marco{flex:1 1 340px;min-width:0;position:relative;display:flex;justify-content:center;padding:0 24px 24px 0}
.marco::before{content:"";position:absolute;right:0;bottom:0;width:80%;height:92%;border:3px solid var(--rojo);border-radius:var(--radio)}
.marco .foto{position:relative;width:80%;border-radius:var(--radio);overflow:hidden;box-shadow:0 24px 48px rgba(0,0,0,.35)}
.marco .foto img{width:100%;aspect-ratio:4/5;object-fit:cover}
.dato-vidrio{position:absolute;left:-6px;bottom:56px;background:rgba(255,255,255,.14);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.3);border-radius:10px;padding:14px 20px;color:#fff}
.dato-vidrio b{display:block;font:700 2.6rem/1 var(--serif)}.dato-vidrio span{font-size:15px;color:#d8eaf4}

/* Cifras */
.cifras{display:flex;flex-wrap:wrap;gap:32px;justify-content:space-between;padding:40px 0}
.cifra b{display:block;font:700 3.25rem/1 var(--serif);color:var(--azul)}
.cifra span{color:var(--gris);font-size:16px}
.cifras-franja{background:#fff;border-top:1px solid var(--linea);border-bottom:1px solid var(--linea)}

/* Dos columnas */
.dos{display:flex;flex-wrap:wrap;gap:56px;align-items:center}
.dos>.a{flex:1 1 320px;min-width:0}.dos>.b{flex:2 1 520px;min-width:0}
.titulo-grande{color:var(--azul)}

/* Tarjetas de vidrio y pasos */
.pasos{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin-top:48px}
.vidrio{background:linear-gradient(160deg,rgba(255,255,255,.12),rgba(255,255,255,.03));border:1px solid rgba(255,255,255,.22);border-radius:12px;padding:32px;transition:transform .25s ease,border-color .25s ease}
.vidrio:hover{transform:translateY(-6px);border-color:rgba(251,47,2,.7)}
.vidrio .n{font:700 3rem/1 var(--serif);color:var(--rojo)}
.vidrio h3{margin:16px 0 8px;font-size:var(--h3)}
.vidrio p{margin:0;color:#d8eaf4}
.tarjeta{background:var(--bruma);border-radius:var(--radio);padding:32px;transition:transform .25s ease,box-shadow .25s ease}
.tarjeta:hover{transform:translateY(-6px);box-shadow:0 18px 36px rgba(0,56,79,.16)}
.tarjeta h3{color:var(--azul);font-size:var(--h3);margin:0 0 8px}
.rejilla-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.lista-check{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.lista-check li{position:relative;padding-left:34px}
.lista-check li::before{content:"";position:absolute;left:0;top:.5em;width:18px;height:3px;background:var(--rojo);border-radius:2px}
.linea-tiempo{list-style:none;margin:0;padding:0;counter-reset:p}
.linea-tiempo li{counter-increment:p;display:flex;gap:28px;padding:26px 0;border-top:2px solid var(--azul)}
.linea-tiempo li:last-child{border-bottom:2px solid var(--azul)}
.linea-tiempo li::before{content:"0" counter(p);font:700 3.25rem/1 var(--serif);color:var(--rojo);min-width:84px}
.linea-tiempo h3{color:var(--azul);font-size:1.6rem;margin:0 0 4px}
.linea-tiempo p{margin:0}
.nota-conf{border-left:4px solid var(--rojo);padding:8px 0 8px 28px;max-width:66ch}

/* Libros: portada con lomo de otro color */
.libros{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:40px 32px}
.libro{display:block;color:inherit;text-decoration:none;transition:transform .3s ease}
.libro:hover{transform:translateY(-10px)}
.tapa{position:relative;aspect-ratio:2/3;border-radius:3px;background:var(--azul);box-shadow:11px 13px 0 var(--rojo);margin:0 11px 13px 0;overflow:hidden}
.libro:nth-child(even) .tapa{box-shadow:11px 13px 0 var(--azul)}
.tapa img{width:100%;height:100%;object-fit:cover}
.tapa::after{content:"";position:absolute;inset:0 auto 0 0;width:7%;background:linear-gradient(90deg,rgba(0,0,0,.28),rgba(255,255,255,.12) 55%,rgba(0,0,0,0));pointer-events:none}
.tapa-generica{box-shadow:11px 13px 0 var(--rojo)!important;display:flex;flex-direction:column;justify-content:flex-end;gap:14px;padding:22px 22px 24px 28px;color:#fff;background:linear-gradient(160deg,#00709f,#00384F)}
.tapa-generica strong{font:700 1.45rem/1.12 var(--serif)}
.tapa-generica small{font-size:12px;letter-spacing:.1em;text-transform:uppercase;opacity:.85}
.libro h3{font-size:1.2rem;color:var(--azul);margin:18px 0 4px}
.libro .sub{font-size:15px;color:var(--gris);line-height:1.4;margin:0 0 10px}
.libro .ver{font-weight:600;color:var(--azul);border-bottom:2px solid var(--azul);padding-bottom:1px}
.chip{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--azul);background:var(--bruma);border-radius:999px;padding:3px 11px;margin-bottom:8px}
.chip.pendiente{color:var(--gris);background:transparent;border:1px dashed var(--gris)}

/* Formulario */
.formulario{display:grid;gap:20px;max-width:640px}
.campo label{display:block;font-weight:600;margin-bottom:6px}
.campo input,.campo textarea{width:100%;font:inherit;color:var(--tinta);background:#fff;border:1.5px solid #b9c4ca;border-radius:var(--radio);padding:13px 14px}
.campo input:focus,.campo textarea:focus{outline:3px solid rgba(0,89,131,.35);border-color:var(--azul)}
.campo textarea{min-height:160px;resize:vertical}
.check{display:flex;gap:12px;align-items:flex-start;font-size:16px}
.check input{margin-top:5px;width:20px;height:20px;flex:none;accent-color:var(--azul)}
.simplificado{font-size:15px;color:var(--gris);margin:0}
.estado{min-height:1.5em;font-weight:600}
.estado.ok{color:#0a6b3a}.estado.error{color:#b42318}
.trampa{position:absolute;left:-9999px;height:0;overflow:hidden}

/* Pie */
.pie{color:#fff;background:radial-gradient(60% 120% at 90% 0%,#00709f,rgba(0,56,79,0) 65%),var(--profundo)}
.cierre{padding:96px 0 56px;text-align:center}
.cierre h2{max-width:20ch;margin:0 auto 32px;color:#fff}
.pie-base{display:flex;flex-wrap:wrap;gap:16px 40px;justify-content:space-between;align-items:center;font-size:15px;color:#b9d3e0;padding:28px 0 32px;border-top:1px solid rgba(255,255,255,.16)}
.pie-base a{color:#fff}
.pie-base nav{display:flex;flex-wrap:wrap;gap:8px 24px}

/* Documento legal */
.documento h2{font-size:1.7rem;margin:48px 0 14px;color:var(--azul)}
.documento h3{font-size:1.2rem;margin:28px 0 8px;color:var(--tinta);font-family:var(--sans)}
.documento ul{padding-left:1.2em}.documento li{margin-bottom:.4em}

/* Aparición suave */
.js .revela{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.js .revela.visible{opacity:1;transform:none}

@media (max-width:980px){
  .libros{grid-template-columns:repeat(2,minmax(0,1fr))}
  .pasos,.rejilla-3{grid-template-columns:1fr}
  .seccion{padding:72px 0}
}
@media (max-width:760px){
  body{font-size:17px}
  .contenedor,.heroe,.cabecera{padding-left:20px;padding-right:20px}
  .hamburguesa{display:inline-block}
  .cabecera{align-items:center}
  .menu,.cabecera .btn-contorno{display:none;width:100%}
  .cabecera.abierto .menu{display:flex;flex-direction:column;gap:4px;padding:8px 0 4px}
  .cabecera.abierto .btn-contorno{display:inline-block;text-align:center;width:auto}
  .heroe{padding-top:40px;padding-bottom:80px;gap:40px}
  .portada .aro{display:none}
  .dato-vidrio{left:0}
  .btn{padding:17px 24px}
  .linea-tiempo li{gap:18px}.linea-tiempo li::before{min-width:60px;font-size:2.6rem}
}
@media (max-width:480px){.libros{grid-template-columns:1fr;max-width:300px;margin:0 auto}}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .portada .luz{animation:none}
  .js .revela{opacity:1;transform:none;transition:none}
  .libro,.tarjeta,.vidrio,.btn{transition:none}
}

/* Utilidades */
.ancho-20{max-width:20ch}.mt20{margin-top:20px}.mt48{margin-top:48px}.mb12{margin-bottom:12px}
.gris-t{color:var(--gris)}.chica{font-size:16px}.sin-margen{margin:0}.intro-libros{margin:14px 0 48px}
.dos.arriba{align-items:flex-start}.dos>.form-col{flex:3 1 520px}.dos>.lado-col{flex:1 1 280px}.oculto{display:none}