*,*::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 */
.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}

/* PAGE HEADER */
.page-header{background:var(--negro);padding:120px 96px 72px;position:relative;overflow:hidden}
.page-header::before{content:'';position:absolute;left:48px;top:72px;bottom:40px;width:1.5px;background:rgba(255,255,255,.08)}
.page-header-label{font-size:9px;font-weight:500;color:rgba(255,255,255,.25);letter-spacing:.22em;text-transform:uppercase;margin-bottom:20px}
.page-header-title{font-family:var(--serif);font-size:clamp(36px,4vw,54px);font-weight:400;color:var(--blanco);line-height:1.08;max-width:700px;margin-bottom:16px}
.page-header-title em{font-style:italic;color:rgba(255,255,255,.45)}
.page-header-sep{display:flex;align-items:center;width:80px;margin-bottom:20px}
.page-header-sep-line{flex:1;height:.5px;background:rgba(255,255,255,.15)}
.page-header-sep-dot{width:4px;height:4px;border-radius:50%;background:var(--tierra);margin:0 8px;flex-shrink:0}
.page-header-sub{font-size:14px;font-weight:300;color:rgba(255,255,255,.3);max-width:520px;line-height:1.85}

/* DARK ICON */
.dark-icon{position:absolute;right:48px;top:50%;transform:translateY(-50%);width:220px;height:220px;pointer-events:none;z-index:10;animation:iconFloat 7s ease-in-out infinite}
.dark-icon img{width:100%;height:100%;object-fit:contain}
@keyframes iconFloat{0%,100%{transform:translateY(-50%) rotate(0deg)}33%{transform:translateY(calc(-50% - 10px)) rotate(1.5deg)}66%{transform:translateY(calc(-50% - 5px)) rotate(-1deg)}}

/* LAYOUT */
.main{max-width:1100px;margin:0 auto;padding:80px 48px}
.section{margin-bottom:72px}
.sep{display:flex;align-items:center;margin:48px 0}
.sep-line{flex:1;height:.5px;background:var(--borde);transform:scaleX(0);transform-origin:left;transition:transform .8s ease}
.sep.visible .sep-line{transform:scaleX(1)}
.sep-dot{width:5px;height:5px;border-radius:50%;background:var(--azul);margin:0 10px;flex-shrink:0;opacity:0;transition:opacity .3s ease .7s}
.sep.visible .sep-dot{opacity:1}
p{font-size:14px;font-weight:300;color:var(--gris);line-height:1.85;max-width:none;margin-bottom:16px}
p strong{color:var(--negro);font-weight:500}
.chapter-label{font-size:9px;font-weight:500;color:var(--azul-desc);letter-spacing:.2em;text-transform:uppercase;margin-bottom:8px;padding-bottom:8px;border-bottom:.5px solid var(--borde)}
.chapter-title-old{display:none}
.chapter-title em{font-style:italic}

/* PULLQUOTE */
.pullquote{border-left:2px solid var(--azul);padding:4px 0 4px 20px;margin:28px 0}
.pullquote-text{font-family:var(--serif);font-size:22px;font-style:italic;font-weight:400;color:var(--azul);line-height:1.5;margin:0}
.pullquote-source{font-size:11px;color:var(--gris);letter-spacing:.06em;margin-top:8px}

/* PREGUNTA CENTRAL — bloque azul */
.pregunta-central{
  background:var(--azul);
  border-radius:10px;
  padding:48px 52px;
  margin:32px 0;
  position:relative;overflow:hidden;
}
.pregunta-central::before{content:'';position:absolute;left:24px;top:32px;bottom:32px;width:1.5px;background:rgba(255,255,255,.1)}
.pregunta-label{font-size:9px;font-weight:500;color:rgba(255,255,255,.3);letter-spacing:.2em;text-transform:uppercase;margin-bottom:16px}
.pregunta-text{font-family:var(--serif);font-size:clamp(22px,2.5vw,30px);font-style:italic;font-weight:400;color:var(--blanco);line-height:1.4;margin-bottom:16px}
.pregunta-sub{font-size:13px;font-weight:300;color:rgba(255,255,255,.4);line-height:1.75;margin:0}

/* NÚCLEO 4 BLOQUES */
.nucleo-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;background:#3a3a3a;border:.5px solid #3a3a3a;border-radius:10px;overflow:hidden;margin-top:24px}
.nucleo-item{background:var(--negro);padding:24px 20px;border-top:4px solid transparent;transition:background .25s}
.nucleo-item:hover{background:#1e1e1e}
.nucleo-1{border-top-color:#1F4E79}
.nucleo-2{border-top-color:#3B82C4}
.nucleo-3{border-top-color:#A0714F}
.nucleo-4{border-top-color:#4E7B62}
.nucleo-num{font-family:var(--serif);font-size:28px;font-weight:400;line-height:1;margin-bottom:10px}
.nucleo-1 .nucleo-num{color:#1F4E79}
.nucleo-2 .nucleo-num{color:#3B82C4}
.nucleo-3 .nucleo-num{color:#A0714F}
.nucleo-4 .nucleo-num{color:#4E7B62}
.nucleo-name{font-size:13px;font-weight:500;color:var(--blanco);margin-bottom:4px}
.nucleo-tag{font-size:10px;font-weight:300;color:rgba(255,255,255,.3);letter-spacing:.06em;text-transform:uppercase;margin-bottom:10px}
.nucleo-desc{font-size:12.5px;font-weight:300;color:rgba(255,255,255,.45);line-height:1.65;margin:0}

/* PASOS */
.pasos{display:flex;flex-direction:column;margin-top:24px}
.paso{display:grid;grid-template-columns:64px 1fr;gap:1.5rem;padding:24px 0;border-bottom:.5px solid var(--borde);align-items:start;transition:background .2s}
.paso:first-child{border-top:.5px solid var(--borde)}
.paso:hover{background:rgba(31,78,121,.09)}
.paso-num{font-family:var(--serif);font-size:40px;font-weight:400;color:var(--tierra);line-height:1;padding-top:4px}
.paso-title{font-size:14px;font-weight:500;color:var(--negro);margin-bottom:6px}
.paso-sub{font-size:11px;font-weight:500;letter-spacing:.1em;text-transform:uppercase;color:var(--azul-desc);margin-bottom:8px}
.paso-desc{font-size:13px;font-weight:300;color:var(--gris);line-height:1.75;margin:0}

/* CHAPTER TITLE max-width for desktop icon clearance */
.chapter-title{font-family:var(--serif);font-size:clamp(28px,3vw,38px);font-weight:400;color:var(--negro);line-height:1.1;margin-bottom:12px;max-width:calc(100% - 140px)}
.chapter-title em{font-style:italic}
.contraste{display:grid;grid-template-columns:1fr 1fr;gap:2px;background:#3a3a3a;border:.5px solid #3a3a3a;border-radius:10px;overflow:hidden;margin-top:24px}
.contraste-col{background:var(--negro);padding:28px 32px}
.contraste-col.oreka{background:#0d2033}
.contraste-label{font-size:9px;font-weight:500;letter-spacing:.16em;text-transform:uppercase;color:rgba(255,255,255,.25);margin-bottom:12px}
.contraste-pregunta{font-family:var(--serif);font-size:19px;font-style:italic;color:rgba(255,255,255,.5);line-height:1.5}
.contraste-col.oreka .contraste-pregunta{color:var(--blanco);font-size:21px}

/* CIERRE */
.cierre{background:var(--negro);border-radius:10px;padding:40px 44px;position:relative;overflow:hidden;margin-top:0}
.cierre::before{content:'';position:absolute;left:20px;top:28px;bottom:28px;width:1.5px;background:rgba(255,255,255,.08)}
.cierre-text{font-family:var(--serif);font-size:21px;font-style:italic;color:rgba(255,255,255,.75);line-height:1.6;margin-bottom:16px}
.cierre-sub{font-size:13px;font-weight:300;color:rgba(255,255,255,.3);line-height:1.7;margin:0}

/* SECTION WITH ICON */
.section-with-icon{position:relative}
.section-icon-float{position:absolute;top:40px;right:0;width:110px;height:110px;pointer-events:none;z-index:0}
.section-icon-float img{width:100%;height:100%;object-fit:contain;animation:iconFloatSmall 6s ease-in-out infinite}
@keyframes iconFloatSmall{0%,100%{transform:translateY(0) rotate(0deg)}33%{transform:translateY(-8px) rotate(1.5deg)}66%{transform:translateY(-4px) rotate(-1deg)}}
[data-slot="0"] img{animation-delay:0s}
[data-slot="1"] img{animation-delay:-2s}
[data-slot="2"] img{animation-delay:-4s}
.chapter-label,.chapter-title,.pullquote,p,.pasos,.contraste,.pregunta-central{position:relative;z-index:1}
@media(min-width:641px){
  .section-with-icon > p{max-width:calc(100% - 130px)}
}

/* BTN */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;border-radius:3px;font-family:var(--sans);font-size:10px;font-weight:500;letter-spacing:.1em;text-transform:uppercase;cursor:pointer;border:none;transition:all .2s;position:relative;overflow:hidden}
.btn::after{content:'→';display:inline-block;transition:transform .3s ease}
.btn:hover::after{transform:translateX(5px)}
.btn-azul{background:var(--azul);color:var(--blanco)}
.btn-azul:hover{background:#163a5e;transform:translateY(-1px);box-shadow:0 6px 20px rgba(31,78,121,.25)}
.btn-ghost{background:transparent;color:var(--azul);border:.5px solid var(--azul)}
.btn-ghost:hover{background:var(--azul);color:var(--blanco);transform:translateY(-1px)}

/* 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}
  .page-header{padding:100px 48px 56px}
  .page-header::before{left:24px}
  .main{padding:56px 32px}
  .nucleo-grid{grid-template-columns:1fr 1fr}
  .contraste{grid-template-columns:1fr}
  .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}
  .page-header{padding:88px 24px 185px;padding-left:52px}
  .page-header .dark-icon{width:90px;height:90px;right:auto;left:0;right:0;margin:auto;top:auto;bottom:56px;transform:none}
  .main{padding:48px 20px}
  .nucleo-grid{grid-template-columns:1fr}
  .pregunta-central{padding:32px 28px}
  .paso{grid-template-columns:44px 1fr;gap:1rem}
  .paso-num{font-size:28px}
  .section-icon-float{width:60px;height:60px;top:28px}
  .footer{padding:32px 24px;flex-direction:column;align-items:flex-start}
}