:root{
  --ink:#11161F;
  --ink-soft:#1B2230;
  --paper:#EEEAE0;
  --paper-line:#D9D2BF;
  --brass:#A9824F;
  --oxblood:#7A2E2E;
  --ink-text:#191D24;
  --paper-text:#F2EEE3;
  --muted-on-paper:#5B5748;
  --muted-on-ink:#A7ACB8;
  --serif:'Fraunces', Georgia, serif;
  --sans:'IBM Plex Sans', -apple-system, sans-serif;
  --max:1140px;
  --ease:cubic-bezier(.22,1,.36,1);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;scroll-padding-top:88px;}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink-text);
  background:var(--paper);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{
  font-family:var(--serif);
  font-weight:500;
  line-height:1.15;
  margin:0;
}
p{margin:0;}
a{color:inherit;}
img{max-width:100%;display:block;}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px;}
section{padding:96px 0;}
@media (max-width:640px){section{padding:64px 0;}}
:focus-visible{outline:2px solid var(--brass);outline-offset:3px;}

/* ---------- Interacción: revelación, preselección y menú ---------- */
/* La revelación se activa solo si el script corrió: sin JS, el contenido se ve igual. */
.js .reveal{
  opacity:0;transform:translateY(24px);
  transition:opacity .7s var(--ease),transform .7s var(--ease);
  transition-delay:calc(var(--i,0) * 70ms);
}
.js .reveal.is-in{opacity:1;transform:none;}
/* Las tarjetas de cargo comparten una rejilla de 1px: se revelan sin desplazarse,
   para que no se abra una franja entre ellas. */
.js .track-card.reveal{transform:none;}

/* El menú se oculta al bajar y reaparece al subir. */
.nav{transition:transform .35s var(--ease);}
.nav.is-hidden{transform:translateY(-100%);}

/* Preselección: al señalar un elemento, sus hermanos bajan de intensidad. */
@media (hover:hover){
  .tracks:hover .track-card:not(:hover),
  .pillars:hover .pillar:not(:hover),
  .source-grid:hover .source-group:not(:hover){opacity:.6;}
}
/* Lo mismo al recorrer con el teclado. Va en su propia regla: si el navegador
   no entiende :has(), solo se pierde esto y la preselección con ratón sigue. */
.tracks:has(.track-card:focus-visible) .track-card:not(:focus-visible){opacity:.6;}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  .js .reveal{opacity:1;transform:none;transition-duration:.01ms;transition-delay:0s;}
  .nav{transition:none;}
}

/* ---------- Nav ---------- */
.nav{
  position:sticky;top:0;z-index:40;
  background:rgba(17,22,31,0.96);
  backdrop-filter:blur(6px);
  border-bottom:1px solid rgba(169,130,79,0.25);
}
.nav .wrap{
  display:flex;align-items:center;justify-content:space-between;
  height:72px;gap:24px;
}
.brand{
  display:flex;align-items:center;gap:10px;
  font-family:var(--serif);color:var(--paper-text);
  font-size:1.15rem;letter-spacing:0.01em;
  text-decoration:none;flex-shrink:0;
}
.brand-mark{
  width:30px;height:30px;border-radius:50%;
  border:1.5px solid var(--brass);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--serif);color:var(--brass);font-size:0.95rem;
  flex-shrink:0;
}
.nav-links{display:flex;gap:28px;list-style:none;margin:0;padding:0;}
.nav-links a{
  color:var(--muted-on-ink);text-decoration:none;font-size:0.93rem;
  transition:color .15s ease;white-space:nowrap;
}
.nav-links a:hover,.nav-links a.active{color:var(--paper-text);}
.nav-links a.active{border-bottom:1px solid var(--brass);padding-bottom:4px;}
.nav-cta{
  display:inline-flex;align-items:center;
  border:1px solid var(--brass);color:var(--brass);
  padding:9px 16px;font-size:0.88rem;text-decoration:none;
  white-space:nowrap;transition:background .15s ease,color .15s ease;
}
.nav-cta:hover{background:var(--brass);color:var(--ink);}
.nav-toggle{display:none;background:none;border:0;color:var(--paper-text);font-size:1.6rem;cursor:pointer;}
@media (max-width:900px){
  .nav-links{
    display:none;position:absolute;top:72px;left:0;right:0;
    flex-direction:column;gap:0;background:var(--ink);
    border-bottom:1px solid rgba(169,130,79,0.25);
  }
  .nav-links.open{display:flex;}
  .nav-links a{padding:16px 24px;border-top:1px solid rgba(169,130,79,0.12);}
  .nav-links a.active{border-bottom:0;border-left:2px solid var(--brass);}
  .nav-toggle{display:block;}
}

/* ---------- Hero ---------- */
.hero{
  background:var(--ink);color:var(--paper-text);
  padding:104px 0 84px;position:relative;overflow:hidden;
}
.hero .wrap{position:relative;z-index:1;}
.hero-kicker{color:var(--brass);font-size:0.95rem;margin-bottom:20px;max-width:560px;}
.hero h1{
  font-size:clamp(2.1rem,4.6vw,3.4rem);max-width:17ch;color:var(--paper-text);
  opacity:0;animation:rise .8s ease forwards;
}
.hero-sub{
  margin-top:24px;max-width:54ch;font-size:1.06rem;color:var(--muted-on-ink);
  opacity:0;animation:rise .8s ease .12s forwards;
}
.hero-actions{
  margin-top:36px;display:flex;gap:18px;flex-wrap:wrap;align-items:center;
  opacity:0;animation:rise .8s ease .24s forwards;
}
@keyframes rise{from{opacity:0;transform:translateY(14px);}to{opacity:1;transform:translateY(0);}}
@media (prefers-reduced-motion:reduce){
  .hero h1,.hero-sub,.hero-actions{animation:none;opacity:1;}
}
.btn-primary{
  display:inline-block;background:var(--brass);color:var(--ink);
  padding:15px 26px;text-decoration:none;font-weight:600;font-size:0.97rem;
  transition:background .15s ease;
}
.btn-primary:hover{background:#BE9660;}
.btn-ghost{
  display:inline-block;color:var(--paper-text);text-decoration:none;
  font-size:0.94rem;border-bottom:1px solid rgba(242,238,227,0.4);padding-bottom:2px;
}
.hero-ring{
  position:absolute;right:-140px;top:50%;transform:translateY(-50%);
  width:420px;height:420px;border-radius:50%;
  border:1px solid rgba(169,130,79,0.35);
}
.hero-ring::before{content:"";position:absolute;inset:44px;border-radius:50%;border:1px solid rgba(169,130,79,0.2);}
@media (max-width:860px){.hero-ring{display:none;}}

/* ---------- Countdown ---------- */
.countdown{
  margin-top:40px;display:flex;gap:0;flex-wrap:wrap;
  border-top:1px solid rgba(169,130,79,0.3);padding-top:22px;
  max-width:460px;
}
.countdown-unit{
  flex:1;min-width:80px;padding-right:20px;
}
.countdown-num{
  font-family:var(--serif);font-size:2rem;color:var(--brass);
  font-variant-numeric:tabular-nums;
}
.countdown-label{font-size:0.82rem;color:var(--muted-on-ink);margin-top:4px;}
.countdown-note{margin-top:14px;font-size:0.86rem;color:var(--muted-on-ink);}

/* ---------- Intro line ---------- */
.intro{background:var(--paper);border-bottom:1px solid var(--paper-line);}
.intro .wrap{padding:40px 24px;}
.intro p{font-size:1.15rem;font-family:var(--serif);font-weight:400;max-width:62ch;color:var(--ink-text);}

/* ---------- Section heads ---------- */
.section-head{max-width:56ch;margin-bottom:56px;}
.section-head h2{font-size:clamp(1.7rem,3vw,2.3rem);}
.section-head p{margin-top:14px;color:var(--muted-on-paper);font-size:1.02rem;}

/* ---------- Tracks (selector de cargo) ---------- */
.tracks{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--paper-line);border:1px solid var(--paper-line);}
@media (max-width:720px){.tracks{grid-template-columns:1fr;}}
.track-card{
  background:var(--paper);padding:36px;text-decoration:none;color:inherit;
  display:flex;flex-direction:column;gap:14px;
  transition:background .15s ease,opacity .25s var(--ease);
}
.track-card:hover{background:#E6E1D2;}
.track-card h3{font-size:1.3rem;}
.track-scale{font-size:0.85rem;color:var(--oxblood);}
.track-card p{color:var(--muted-on-paper);font-size:0.96rem;flex-grow:1;}
.track-link{font-size:0.92rem;color:var(--brass);border-bottom:1px solid var(--brass);align-self:flex-start;padding-bottom:1px;}

/* ---------- Pillars (método completo, index) ---------- */
.pillars{display:grid;gap:0;}
.pillar{transition:opacity .25s var(--ease);display:grid;grid-template-columns:220px 1fr;gap:36px;padding:34px 0;border-top:1px solid var(--paper-line);}
.pillar:last-child{border-bottom:1px solid var(--paper-line);}
.pillar h3{font-size:1.25rem;color:var(--ink-text);}
.pillar-tag{font-size:0.85rem;color:var(--oxblood);margin-top:8px;display:block;}
.pillar ul{margin:14px 0 0;padding-left:18px;color:var(--muted-on-paper);}
.pillar li{margin-bottom:8px;font-size:0.98rem;}
.pillar li::marker{color:var(--brass);}
@media (max-width:720px){.pillar{grid-template-columns:1fr;gap:10px;}}

/* ---------- Reto + highlights (páginas de cargo) ---------- */
.challenge{background:var(--paper);}
.challenge .section-head{margin-bottom:32px;}
.highlight-list{border-top:1px solid var(--paper-line);}
.highlight{
  display:grid;grid-template-columns:200px 1fr;gap:32px;
  padding:26px 0;border-bottom:1px solid var(--paper-line);
}
.highlight h4{font-family:var(--sans);font-weight:600;font-size:0.98rem;color:var(--oxblood);}
.highlight p{color:var(--muted-on-paper);font-size:0.98rem;}
@media (max-width:720px){.highlight{grid-template-columns:1fr;gap:8px;}}
.method-link{display:inline-block;margin-top:28px;font-size:0.94rem;color:var(--oxblood);border-bottom:1px solid var(--oxblood);padding-bottom:1px;text-decoration:none;}

/* ---------- Caso ilustrativo ---------- */
.case{background:var(--ink);color:var(--paper-text);}
.case .section-head p{color:var(--muted-on-ink);}
.case .section-head h2{color:var(--paper-text);}
.case-grid{display:grid;grid-template-columns:1fr 1.3fr;gap:48px;}
@media (max-width:860px){.case-grid{grid-template-columns:1fr;}}
.case-brief{border:1px solid rgba(169,130,79,0.35);padding:28px;height:fit-content;}
.case-brief dt{font-size:0.82rem;color:var(--brass);margin-top:16px;}
.case-brief dt:first-child{margin-top:0;}
.case-brief dd{margin:4px 0 0;font-family:var(--serif);font-size:1.08rem;}
.case-notes{display:flex;flex-direction:column;gap:22px;}
.case-note{border-left:2px solid var(--brass);padding-left:20px;}
.case-note h4{font-family:var(--sans);font-size:0.85rem;color:var(--muted-on-ink);font-weight:600;margin:0 0 6px;}
.case-note p{font-size:1.02rem;color:var(--paper-text);}

/* ---------- Proceso ---------- */
.process{counter-reset:step;}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;}
@media (max-width:860px){.steps{grid-template-columns:1fr 1fr;}}
@media (max-width:520px){.steps{grid-template-columns:1fr;}}
.step{border-top:2px solid var(--oxblood);padding-top:16px;}
.step-num{counter-increment:step;font-family:var(--serif);font-size:1.3rem;color:var(--oxblood);}
.step-num::before{content:counter(step, decimal-leading-zero) ".";}
.step h3{font-size:1.05rem;margin-top:10px;}
.step p{margin-top:8px;color:var(--muted-on-paper);font-size:0.95rem;}

/* ---------- Herramientas y fuentes ---------- */
.sources{background:var(--ink);color:var(--paper-text);}
.sources .section-head h2{color:var(--paper-text);}
.sources .section-head p{color:var(--muted-on-ink);}
.source-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 56px;}
.source-group{transition:opacity .25s var(--ease);padding:28px 0;border-top:1px solid rgba(169,130,79,0.28);}
.source-group.wide{grid-column:1 / -1;}
.source-group h3{
  font-family:var(--sans);font-weight:600;font-size:0.9rem;
  letter-spacing:0.06em;text-transform:uppercase;color:var(--brass);
}
.source-group ul{margin:16px 0 0;padding-left:18px;}
.source-group.wide ul{columns:2;column-gap:56px;}
.source-group li{margin-bottom:10px;font-size:0.95rem;color:var(--muted-on-ink);break-inside:avoid;}
.source-group li::marker{color:var(--brass);}
.source-group b{color:var(--paper-text);font-weight:600;}
.source-note{
  margin-top:34px;padding-top:22px;
  border-top:1px solid rgba(169,130,79,0.28);
  font-size:0.9rem;color:var(--muted-on-ink);max-width:78ch;
}
@media (max-width:820px){
  .source-grid{grid-template-columns:1fr;}
  .source-group.wide ul{columns:1;}
}

/* ---------- Seguimiento / KPIs ---------- */
.ledger{border-top:1px solid var(--paper-line);}
.ledger-cols{display:grid;grid-template-columns:1fr 1fr;}
@media (max-width:720px){.ledger-cols{grid-template-columns:1fr;}}
.ledger-col{padding:28px 0;}
.ledger-col:first-child{border-right:1px solid var(--paper-line);padding-right:36px;}
.ledger-col:last-child{padding-left:36px;}
@media (max-width:720px){
  .ledger-col:first-child{border-right:0;border-bottom:1px solid var(--paper-line);padding-right:0;}
  .ledger-col:last-child{padding-left:0;}
}
.ledger-col h3{font-size:1.05rem;margin-bottom:16px;}
.ledger-row{display:flex;justify-content:space-between;gap:16px;padding:12px 0;border-top:1px solid var(--paper-line);font-size:0.96rem;}
.ledger-row:first-of-type{border-top:0;}
.ledger-row span:last-child{color:var(--muted-on-paper);text-align:right;}

/* ---------- CTA final ---------- */
.final-cta{background:var(--oxblood);color:var(--paper-text);text-align:left;}
.final-cta .wrap{display:flex;justify-content:space-between;align-items:center;gap:32px;flex-wrap:wrap;}
.final-cta h2{color:var(--paper-text);font-size:clamp(1.6rem,3vw,2.1rem);max-width:22ch;}
.final-cta .btn-primary{background:var(--paper-text);color:var(--oxblood);}
.final-cta .btn-primary:hover{background:#ffffff;}

/* ---------- Footer ---------- */
footer{background:var(--ink);color:var(--muted-on-ink);}
footer .wrap{padding:40px 24px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;font-size:0.88rem;}
footer .brand{font-size:1rem;}