*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --azul:#1F4E79;
  --azul-desc:#3B82C4;
  --niebla:#EBF3FB;
  --tierra:#A0714F;
  --gris:#6B7280;
  --negro:#1A1A1A;
  --blanco:#FFFFFF;
  --fondo:#FDFAF7;
  --borde:rgba(0,0,0,0.08);
  --serif:'Playfair Display',Georgia,serif;
  --sans:'Jost',Arial,sans-serif;
}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--fondo);color:var(--negro);line-height:1.7;font-weight:300}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}

/* NAV */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(253,250,247,0.96);backdrop-filter:blur(8px);border-bottom:.5px solid var(--borde);padding:0 48px;display:flex;align-items:center;justify-content:space-between;height:52px}
.nav-logo{display:flex;align-items:center}
.nav-logo-img{height:46px;width:auto;display:block}
.nav-links{display:flex;align-items:center;gap:28px;list-style:none}
.nav-links a{font-size:10px;font-weight:500;letter-spacing:.1em;text-transform:uppercase;color:var(--gris);transition:color .2s}
.nav-links a:hover{color:var(--azul)}
.nav-links a.active{color:var(--azul)}
.nav-cta{color:var(--azul) !important;border:.5px solid var(--azul);padding:5px 14px;border-radius:3px;transition:all .2s !important}
.nav-cta:hover{background:var(--azul);color:var(--blanco) !important}
.nav-burger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:4px}
.nav-burger span{display:block;width:20px;height:1px;background:var(--negro)}
.progress-bar{position:fixed;top:52px;left:0;z-index:99;height:2px;background:var(--azul-desc);width:0%;transition:width .1s linear;opacity:.8}

/* HERO */
.frag-hero{
  background:var(--azul);
  padding:120px 96px 72px;
  position:relative;overflow:hidden;
  display:grid;grid-template-columns:1fr 320px;
  gap:3rem;align-items:end;
}
.frag-hero::before{content:'';position:absolute;left:48px;top:72px;bottom:40px;width:1.5px;background:rgba(255,255,255,.08)}
.frag-back{display:inline-flex;align-items:center;gap:8px;font-size:10px;font-weight:500;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.3);margin-bottom:32px;transition:color .2s}
.frag-back:hover{color:rgba(255,255,255,.7)}
.frag-back::before{content:'←';font-size:12px}
.frag-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:4px;font-size:9px;font-weight:500;letter-spacing:.14em;text-transform:uppercase;background:rgba(160,113,79,.25);color:#c8976a;border:.5px solid rgba(160,113,79,.3);margin-bottom:16px}
.frag-badge-dot{width:4px;height:4px;border-radius:50%;background:currentColor;flex-shrink:0}
.frag-subtitle{font-size:11px;font-weight:400;color:rgba(255,255,255,.3);letter-spacing:.1em;text-transform:uppercase;margin-bottom:12px}
.frag-title{font-family:var(--serif);font-size:clamp(32px,4vw,50px);font-weight:400;color:var(--blanco);line-height:1.08;margin-bottom:12px}
.frag-title em{font-style:italic;color:rgba(255,255,255,.55)}
.frag-autor{font-size:13px;font-weight:300;color:rgba(255,255,255,.35);margin-bottom:32px}
.frag-sep{display:flex;align-items:center;width:80px;margin-bottom:20px}
.frag-sep-line{flex:1;height:.5px;background:rgba(255,255,255,.15)}
.frag-sep-dot{width:4px;height:4px;border-radius:50%;background:var(--tierra);margin:0 8px;flex-shrink:0}
.frag-desc{font-size:14px;font-weight:300;color:rgba(255,255,255,.35);max-width:520px;line-height:1.85}

/* PORTADA EN HERO */
.frag-portada{
  display:flex;justify-content:center;align-items:flex-end;
  padding-bottom:4px;
}
.frag-portada-box{
  width:180px;aspect-ratio:2/3;
  background:rgba(255,255,255,.06);
  border:.5px solid rgba(255,255,255,.12);
  border-radius:6px;
  display:flex;flex-direction:column;
  align-items:center;justify-content:center;
  padding:1.5rem;text-align:center;
  position:relative;
}
.frag-portada-box img.portada-real{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;border-radius:6px}
.frag-portada-atomo{width:48px;height:48px;margin-bottom:16px;opacity:.35}
.frag-portada-title{font-family:var(--serif);font-size:14px;color:var(--blanco);line-height:1.3;margin-bottom:6px}
.frag-portada-sep{width:20px;height:.5px;background:rgba(255,255,255,.25);margin:0 auto 6px}
.frag-portada-author{font-size:9px;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.3)}

/* FRAGMENTO LAYOUT */
.frag-layout{
  display:grid;
  grid-template-columns:1fr 280px;
  gap:4rem;
  max-width:1100px;margin:0 auto;
  padding:80px 48px;
  align-items:start;
}

/* TEXTO DEL LIBRO */
.frag-texto{max-width:640px}

/* Epígrafe */
.frag-epigrafe{
  margin-bottom:48px;
  padding:20px 24px;
  border-left:2px solid var(--tierra);
  background:rgba(160,113,79,.04);
  border-radius:0 6px 6px 0;
}
.frag-epigrafe-cita{
  font-family:var(--serif);font-size:18px;font-style:italic;
  color:var(--negro);line-height:1.55;margin-bottom:8px;
}
.frag-epigrafe-fuente{font-size:11px;color:var(--gris);letter-spacing:.06em}

/* Título del fragmento */
.frag-cap-num{font-size:10px;font-weight:500;letter-spacing:.2em;text-transform:uppercase;color:var(--azul-desc);margin-bottom:8px}
.frag-cap-title{font-family:var(--serif);font-size:30px;font-weight:400;color:var(--negro);line-height:1.15;margin-bottom:36px}
.frag-cap-title em{font-style:italic}

/* Cuerpo */
.frag-texto p{
  font-family:var(--serif);
  font-size:18px;font-weight:400;
  color:#2a2a2a;line-height:2;
  margin-bottom:28px;
}
.frag-texto p strong{font-weight:500}
.frag-texto p em{font-style:italic}

/* Separador interno */
.frag-isep{
  display:flex;align-items:center;
  margin:40px 0;width:100px;
}
.frag-isep-line{flex:1;height:.5px;background:var(--borde)}
.frag-isep-dot{width:4px;height:4px;border-radius:50%;background:var(--azul);margin:0 8px;flex-shrink:0}

/* Pullquote */
.frag-pull{
  border-left:3px solid var(--azul);
  padding:8px 0 8px 24px;
  margin:36px 0;
}
.frag-pull p{
  font-family:var(--serif);
  font-size:22px !important;font-style:italic;
  color:var(--azul) !important;
  line-height:1.5 !important;margin-bottom:0 !important;
}

/* Fin del fragmento — cortina */
.frag-cortina{
  position:relative;
  margin-top:-80px;
  padding-top:80px;
  background:linear-gradient(to bottom, rgba(253,250,247,0) 0%, rgba(253,250,247,1) 60%);
  text-align:center;
  padding-bottom:48px;
}
.frag-cortina-texto{
  font-family:var(--serif);font-size:18px;font-style:italic;
  color:var(--gris);margin-bottom:28px;line-height:1.6;
}
.frag-cortina-btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.frag-cortina-cta{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--azul);color:var(--blanco);
  padding:14px 28px;border-radius:4px;
  font-family:var(--sans);font-size:11px;font-weight:500;
  letter-spacing:.1em;text-transform:uppercase;
  transition:all .25s;margin-right:12px;
}
.frag-cortina-cta:hover{background:#163a5e;transform:translateY(-1px);box-shadow:0 6px 20px rgba(31,78,121,.25)}
.frag-cortina-cta::after{content:'→';display:inline-block;transition:transform .3s ease}
.frag-cortina-cta:hover::after{transform:translateX(5px)}
.frag-cortina-sec{
  display:inline-flex;align-items:center;gap:8px;
  background:transparent;color:var(--azul);
  padding:14px 24px;border-radius:4px;
  font-family:var(--sans);font-size:11px;font-weight:500;
  letter-spacing:.1em;text-transform:uppercase;
  border:.5px solid var(--azul);
  transition:all .25s;
}
.frag-cortina-sec:hover{background:var(--azul);color:var(--blanco);transform:translateY(-1px)}

/* SIDEBAR */
.frag-sidebar{position:sticky;top:80px}
.frag-sidebar-info{
  background:var(--blanco);
  border:.5px solid var(--borde);
  border-radius:8px;
  padding:20px 22px;
  margin-bottom:16px;
}
.frag-sidebar-label{font-size:9px;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--gris);margin-bottom:12px;padding-bottom:8px;border-bottom:.5px solid var(--borde)}
.frag-sidebar-row{display:flex;justify-content:space-between;padding:8px 0;border-bottom:.5px solid var(--borde);font-size:12px}
.frag-sidebar-row:last-child{border-bottom:none}
.frag-sidebar-row span:first-child{color:var(--gris);font-weight:300}
.frag-sidebar-row span:last-child{color:var(--negro);font-weight:500;text-align:right}

.frag-sidebar-cta{
  background:var(--negro);
  border-radius:8px;padding:22px;
  margin-bottom:16px;
}
.frag-sidebar-cta-text{font-family:var(--serif);font-size:15px;font-style:italic;color:rgba(255,255,255,.75);line-height:1.55;margin-bottom:14px}
.frag-sidebar-cta-btn{
  display:block;text-align:center;padding:10px;border-radius:4px;
  font-family:var(--sans);font-size:10px;font-weight:500;
  letter-spacing:.1em;text-transform:uppercase;
  background:var(--blanco);color:var(--negro);
  transition:all .2s;
}
.frag-sidebar-cta-btn:hover{background:var(--niebla)}

.frag-sidebar-toc{
  background:var(--blanco);
  border:.5px solid var(--borde);
  border-radius:8px;padding:20px 22px;
}
.frag-toc-item{
  display:block;font-size:12px;font-weight:300;
  color:var(--gris);padding:7px 0;
  border-bottom:.5px solid var(--borde);
  transition:color .2s;line-height:1.4;
}
.frag-toc-item:last-child{border-bottom:none}
.frag-toc-item.active{color:var(--azul);font-weight:500}
.frag-toc-item:hover{color:var(--azul)}

/* FADE */
.fade-up{opacity:0;transform:translateY(20px);transition:opacity .7s ease,transform .7s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* FOOTER */
.footer{background:var(--negro);padding:48px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:24px}
.footer-logo{display:flex;flex-direction:column;gap:6px}
.footer-logo-img{height:56px;width:auto;opacity:.9}
.footer-logo span{font-family:var(--sans);font-size:8px;letter-spacing:.18em;text-transform:uppercase;color:rgba(255,255,255,.25)}
.footer-links{display:flex;gap:24px;list-style:none;flex-wrap:wrap}
.footer-links a{font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.32);transition:color .2s}
.footer-links a:hover{color:rgba(255,255,255,.75)}
.footer-meta{font-size:9px;color:rgba(255,255,255,.18);letter-spacing:.06em}

/* RESPONSIVE */
@media(max-width:900px){
  .nav{padding:0 24px}
  .frag-hero{grid-template-columns:1fr;padding:100px 48px 56px}
  .frag-hero::before{left:24px}
  .frag-portada{display:none}
  .frag-layout{grid-template-columns:1fr;gap:2.5rem;padding:48px 32px}
  .frag-sidebar{position:static}
  .footer{padding:36px}
}
@media(max-width:640px){
  .nav{padding:0 20px}
  .nav-links{display:none}
  .nav-links.open{display:flex;flex-direction:column;position:absolute;top:52px;left:0;right:0;background:rgba(253,250,247,.98);border-bottom:.5px solid var(--borde);padding:20px 24px;gap:16px}
  .nav-burger{display:flex}
  .frag-hero{padding:88px 24px 48px;padding-left:52px}
  .frag-cortina-btns{flex-direction:column;align-items:center;gap:10px}
  .frag-cortina-cta,.frag-cortina-sec{width:100%;max-width:280px;justify-content:center;text-align:center}
  .frag-texto p{font-size:16px}
  .footer{padding:32px 24px;flex-direction:column;align-items:flex-start}
}


.frag-portada-box img.portada-real{background:transparent}
.frag-portada-box:has(img.portada-real){background:transparent;border-color:transparent}