:root{--azul-oscuro:#06263d;--azul:#0b4d73;--azul-claro:#dcecf4;--dorado:#c69a45;--dorado-claro:#e7c982;--pergamino:#f5efdf;--pergamino-2:#fffaf0;--texto:#1d2730;--gris:#6d7479;--borde:#d8c59a;--blanco:#fff}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#e8e1d2;color:var(--texto);font-family:Georgia,"Times New Roman",serif}a{text-decoration:none;color:inherit}
.header{min-height:175px;display:grid;grid-template-columns:180px 1.05fr 1fr;align-items:center;gap:20px;padding:14px 34px;color:#fff;background:url("assets/header-fondo-aprobado.jpg") center/cover;border-bottom:4px solid var(--dorado)}
.logo-link{display:flex;align-items:center;justify-content:center;width:100%;height:100%}.logo{width:145px;height:145px;object-fit:contain;margin:auto}.institution h2{margin:0;font-size:26px;line-height:1.05;text-transform:uppercase}.institution p{margin:7px 0 0;font-size:14px;color:#e7edf1}.book-title{text-align:right}.book-title h1{margin:0;color:var(--dorado-claro);font-size:43px;line-height:.98;text-transform:uppercase;text-shadow:2px 2px 4px #000}.book-title span{display:block;margin-top:10px;font-size:15px;color:#fff}
.top-nav{height:54px;display:flex;align-items:center;padding-left:220px;background:var(--azul-oscuro);color:#fff;border-bottom:2px solid var(--dorado)}.top-nav a{padding:16px 28px;border-right:1px solid rgba(255,255,255,.18);font-size:16px}.top-nav a:hover,.top-nav a.active{background:#0b5d88;color:var(--dorado-claro)}.search{margin-left:auto;margin-right:25px;width:245px;padding:9px 15px;border:0;border-radius:22px;outline:0}
.page{display:grid;grid-template-columns:275px minmax(0,1fr);min-height:calc(100vh - 204px)}.sidebar{background:linear-gradient(#07334e,#06283e);color:#fff;border-right:4px solid var(--dorado);position:sticky;top:0;height:calc(100vh - 204px);overflow:auto}.sidebar-title{padding:13px 18px;background:#08243a;font-weight:bold;font-size:18px}.sidebar-part{padding:12px 18px;background:linear-gradient(90deg,#d9b76b,#f1dfad);color:#17202a;font-weight:bold;border-top:1px solid #aa843e;border-bottom:1px solid #aa843e}.sidebar-part small{display:block;font-size:12px;margin-top:2px}.sidebar a{display:block;padding:9px 15px;font-size:12.5px;color:#edf3f6;border-bottom:1px solid rgba(255,255,255,.07);line-height:1.2}.sidebar a:hover,.sidebar a.active{background:#0d547a;color:var(--dorado-claro)}.sidebar a .n{color:#dcb45c;margin-right:4px}
.content{padding:24px;background:radial-gradient(circle at 20% 20%,rgba(255,255,255,.8),transparent 35%),var(--pergamino)}.breadcrumb{margin-bottom:12px;font-size:13px;color:#65717a}.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 285px;gap:22px}.article{background:var(--pergamino-2);border:1px solid var(--borde);box-shadow:0 4px 16px rgba(53,42,24,.12);padding:28px}.chapter-number{color:var(--azul);font-size:25px;font-weight:bold}.article h1{margin:2px 0;color:#0b3150;font-size:38px;line-height:1.05}.article .subtitle{color:#4c5961;font-size:20px;margin-bottom:18px}.article h2{color:#0b3150;font-size:23px;margin:28px 0 12px;padding-bottom:5px;border-bottom:1px solid #ddcfb2}.article h3{color:#174f70;font-size:19px;margin:22px 0 8px}.article p{font-size:16px;line-height:1.72;margin:0 0 13px}.article .quote{margin:20px 0;padding:16px 22px;background:#fff2cf;border-left:5px solid #d99c24;text-align:center;font-style:italic;font-size:17px;line-height:1.55}.article .key{padding:16px 20px;background:#eef6f9;border:1px solid #c5dce6;border-radius:6px;margin:20px 0}.article ul,.article ol{margin-top:6px;margin-bottom:16px;padding-left:28px}.article li{font-size:16px;line-height:1.55;margin:4px 0}.article .section-label{font-weight:bold;color:#123c59}.backnext{display:flex;justify-content:space-between;gap:12px;margin-top:30px;padding-top:18px;border-top:1px solid #d8c59a}.btn{display:inline-block;padding:10px 15px;background:#76551e;color:#fff;border-radius:4px}.btn:hover{background:#5e4318}
.right-column{display:flex;flex-direction:column;gap:15px}.info-card{background:#f8fbfc;border:1px solid #c8d8df;border-radius:7px;overflow:hidden;box-shadow:0 3px 12px rgba(0,0,0,.08)}.info-card h3{margin:0;padding:12px 15px;background:linear-gradient(90deg,#d9ebf2,#eef7fa);color:#0a3654;font-size:19px;border-bottom:1px solid #c8d8df}.info-card .body{padding:15px}.toc a{display:block;padding:6px 0;font-size:13px;color:#164c69;border-bottom:1px dotted #c7d5da}.toc a:hover{color:#8a651f}.status{font-size:13px;line-height:1.5}.status strong{color:#0b4d73}
.index-hero{padding:10px 2px 18px}.index-hero h1{font-size:42px;color:#0b3150;margin:0 0 6px}.index-hero p{font-size:20px;color:#4c5961;margin:0}.chapter-card{padding:17px 0;border-top:1px solid #d9cdb4}.chapter-card h2{margin:0 0 7px;font-size:23px;color:#0b3150}.chapter-card p{margin:0;color:#68737a}.chapter-card.disabled{opacity:.62}.chapter-card .tag{display:inline-block;font-size:11px;background:#e8dfc8;padding:4px 8px;border-radius:10px;margin-top:8px;color:#6c572d}
footer{padding:20px 30px;background:var(--azul-oscuro);color:#fff;border-top:3px solid var(--dorado);text-align:center;font-size:13px}
@media(max-width:1050px){.header{grid-template-columns:120px 1fr}.book-title{grid-column:2;text-align:left}.top-nav{padding-left:0}.content-grid{grid-template-columns:1fr}.right-column{display:grid;grid-template-columns:repeat(2,1fr)}.sidebar{height:auto;position:relative}.page{grid-template-columns:240px 1fr}}
@media(max-width:750px){.page{grid-template-columns:1fr}.top-nav{overflow-x:auto}.search{display:none}.header{grid-template-columns:80px 1fr;padding:14px}.logo{width:82px;height:82px}.institution h2{font-size:18px}.book-title h1{font-size:27px}.right-column{display:flex}.article h1{font-size:30px}}

/* ==========================================================
   MODO LECTURA DEFINITIVO: SOLO EL CONTENIDO CENTRAL SE MUEVE
   ========================================================== */
html, body{width:100%;height:100%;margin:0;overflow:hidden!important}
.header{position:fixed!important;top:0!important;left:0!important;right:0!important;width:100%!important;height:175px!important;min-height:175px!important;z-index:5000!important}
.top-nav{position:fixed!important;top:175px!important;left:0!important;right:0!important;width:100%!important;height:54px!important;min-height:54px!important;z-index:4900!important}
.page{position:fixed!important;top:229px!important;left:0!important;right:0!important;bottom:0!important;width:auto!important;height:auto!important;min-height:0!important;overflow:hidden!important;display:block!important}
.sidebar{position:fixed!important;top:229px!important;left:0!important;bottom:0!important;width:255px!important;height:auto!important;overflow-y:auto!important;overflow-x:hidden!important;z-index:4800!important}
.content{position:fixed!important;top:229px!important;left:255px!important;right:0!important;bottom:0!important;width:auto!important;height:auto!important;min-height:0!important;margin:0!important;overflow-y:auto!important;overflow-x:hidden!important;z-index:100!important;padding:24px 330px 50px 24px!important}
.content-grid{display:block!important;width:100%!important}
.article{position:relative!important;width:100%!important;min-width:0!important}
.content>.content-grid>.right-column,.right-column{position:fixed!important;top:253px!important;right:22px!important;bottom:22px!important;width:285px!important;height:auto!important;max-height:none!important;overflow-y:auto!important;overflow-x:hidden!important;z-index:4700!important}
body>footer,footer{display:none!important}

@media(max-width:1050px){
 html,body{height:auto!important;overflow:auto!important}
 .header{position:relative!important;top:auto!important;height:auto!important;min-height:175px!important}
 .top-nav{position:relative!important;top:auto!important}
 .page{position:relative!important;top:auto!important;left:auto!important;right:auto!important;bottom:auto!important;height:auto!important;overflow:visible!important}
 .sidebar{position:relative!important;top:auto!important;left:auto!important;bottom:auto!important;width:100%!important;max-height:360px!important}
 .content{position:relative!important;top:auto!important;left:auto!important;right:auto!important;bottom:auto!important;width:100%!important;height:auto!important;overflow:visible!important;padding:24px!important}
 .right-column{position:relative!important;top:auto!important;right:auto!important;bottom:auto!important;width:100%!important;max-height:none!important;overflow:visible!important}
 footer{display:block!important}
}

/* ETAPA 2 — MATERIAL VISUAL DEL LIBRO */
.book-figure{margin:28px 0 34px;background:#f8f1df;border:1px solid #d8c18b;border-left:5px solid #b88720;padding:12px;box-shadow:0 8px 20px rgba(0,0,0,.08)}
.book-figure img{display:block;width:100%;height:auto;max-height:620px;object-fit:contain;margin:0 auto;background:#eee8da}
.book-figure figcaption{font-size:14px;line-height:1.45;color:#4b5660;text-align:center;padding:10px 8px 3px;font-style:italic}
.book-figure.small img{max-width:430px}
.book-figure.medium img{max-width:680px}
.visual-label{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:#8b6516;font-weight:700;margin-bottom:7px}

/* TOC del capítulo: navegación jerárquica dentro de la ventana */
.right-column .toc a.level-h3{padding-left:26px;font-size:.92em;}
.right-column .toc a{cursor:pointer;}