:root{
  --bg:#0B1120; --panel:rgba(30,41,59,.45); --line:rgba(148,163,184,.14);
  --text:#CBD5E1; --bright:#F8FAFC; --muted:#94A3B8;
  --blue:#1E3A8A; --accent:#0EA5E9; --cyan:#22D3EE;
  --grad:linear-gradient(135deg,#0EA5E9,#1E3A8A);
  --gradtext:linear-gradient(135deg,#22D3EE,#0EA5E9); /* para texto sobre fondo oscuro; --grad termina muy oscuro */
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:Inter,system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.65;
  background-image:radial-gradient(60rem 30rem at 70% -10%,rgba(14,165,233,.12),transparent 60%),
                   radial-gradient(40rem 24rem at 10% 20%,rgba(30,58,138,.25),transparent 60%)}
h1,h2,h3{font-family:"Space Grotesk",Inter,sans-serif;color:var(--bright);line-height:1.15;font-weight:700}
code,.mono{font-family:"JetBrains Mono",monospace}
a{color:var(--accent)}
.wrap{max-width:1080px;margin:0 auto;padding:0 1.5rem}

/* header sticky */
header{position:sticky;top:0;z-index:10;background:rgba(11,17,32,.82);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:.85rem 0}
/* Marca: sistema radial "6IA" (vigente desde sep-2026). Reemplaza el wordmark
   tipografico con la "E" en gradiente, que respondia al hexagono v2.0. */
.brand{display:flex;align-items:center;text-decoration:none;line-height:0}
.brand-lockup{height:52px;width:auto;display:block}
@media (max-width:520px){.brand-lockup{height:42px}}
.nav-right{display:flex;align-items:center;gap:1.25rem}
.nav-right>a{text-decoration:none;font-size:.92rem;white-space:nowrap}
.cta-mini{background:var(--grad);color:#fff !important;padding:.5rem 1rem;border-radius:8px;font-weight:600;transition:filter .2s}
.cta-mini:hover{filter:brightness(1.15)}

/* hero */
.hero{padding:6rem 0 4rem;text-align:left}
.hero h1{font-size:clamp(2rem,5vw,3.4rem);max-width:900px;margin-bottom:1.25rem}
.hero h1 .k{display:inline-block;opacity:0;transform:translateY(26px);animation:kin .7s cubic-bezier(.2,.7,.2,1) forwards}
.hero h1 .k:nth-child(2){animation-delay:.18s}
.hero h1 .k:nth-child(3){animation-delay:.36s}
.hero .sub{font-size:1.2rem;color:var(--muted);max-width:640px;margin-bottom:2.25rem;opacity:0;animation:kin .7s .55s forwards}
.hero .ctas{display:flex;gap:1rem;flex-wrap:wrap;opacity:0;animation:kin .7s .7s forwards}
@keyframes kin{to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){
  .hero .k,.hero .sub,.hero .ctas{animation:none;opacity:1;transform:none}
}
.btn{display:inline-block;background:var(--grad);color:#fff;padding:.9rem 1.7rem;border-radius:9px;text-decoration:none;font-weight:600;transition:filter .2s,transform .2s}
.btn:hover{filter:brightness(1.15);transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--cyan);border:1px solid rgba(34,211,238,.4)}
.btn.ghost:hover{border-color:var(--cyan);filter:none}

section{padding:4rem 0}
section h2{font-size:1.9rem;margin-bottom:.5rem}
.lead{color:var(--muted);max-width:640px;margin-bottom:2rem}

/* tarjeta glass base */
.card{background:var(--panel);backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:14px;padding:1.4rem;transition:border-color .25s,transform .25s}
.card:hover{border-color:rgba(14,165,233,.45);transform:translateY(-2px)}
.card h3{font-size:1.05rem;margin-bottom:.45rem}
.card p,.card li{font-size:.95rem;color:var(--text)}

/* timeline 5 días */
.timeline{display:grid;grid-template-columns:1fr;gap:1rem;list-style:none}
@media (min-width:640px){.timeline{grid-template-columns:repeat(2,1fr)}}
@media (min-width:900px){.timeline{grid-template-columns:repeat(3,1fr)}}
.timeline .day{font-family:"JetBrains Mono";font-size:.78rem;color:var(--cyan);display:inline-block;border:1px solid rgba(34,211,238,.35);border-radius:99px;padding:.1rem .6rem;margin-bottom:.7rem}
.timeline .poc{border-color:rgba(34,211,238,.6);box-shadow:0 0 24px rgba(34,211,238,.12)}
.timeline .poc .day{background:rgba(34,211,238,.12)}
.timeline .poc h3{color:var(--cyan)}

/* bento verticales */
.bento{display:grid;grid-template-columns:repeat(3,1fr);grid-auto-rows:minmax(150px,auto);gap:1rem}
.b-pro{grid-column:1/3;grid-row:1/3}
.tag{font-family:"JetBrains Mono";font-size:.72rem;color:var(--cyan);letter-spacing:1px;text-transform:uppercase}
.ico{width:26px;height:26px;stroke:var(--cyan);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;display:block;margin-bottom:.7rem}
.bento ul{list-style:none;margin-top:.8rem;display:grid;gap:.55rem}
.bento li{padding-left:1.1rem;position:relative}
.bento li::before{content:"▸";position:absolute;left:0;color:var(--accent)}
@media (max-width:760px){.bento{grid-template-columns:1fr}.b-pro{grid-column:auto;grid-row:auto}}

/* core técnico */
.core{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1rem}
.core .path{font-family:"JetBrains Mono";font-size:.78rem;color:var(--muted);display:block;margin-bottom:.6rem}
.core .path::before{content:"$ ";color:var(--accent)}

/* compromisos */
.pledges{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}
.pledges .big{font-family:"Space Grotesk";font-size:1.5rem;color:var(--bright);display:block;margin-bottom:.3rem}
.pledges .big em{font-style:normal;background:var(--gradtext);-webkit-background-clip:text;background-clip:text;color:transparent}

/* footer + formulario */
footer{border-top:1px solid var(--line);padding:4rem 0 3rem}
footer h2{font-size:1.6rem;margin-bottom:.4rem}
form{display:grid;gap:.9rem;max-width:560px;margin-top:1.6rem}
.field{display:grid;gap:.35rem}
.field label{font-size:.85rem;color:var(--muted)}
input,textarea{background:rgba(15,23,42,.7);border:1px solid var(--line);border-radius:9px;padding:.8rem 1rem;color:var(--bright);font:inherit}
input:focus,textarea:focus{outline:none;border-color:var(--accent)}
::placeholder{color:#64748B}
form .btn{border:none;cursor:pointer;justify-self:start;font:inherit;font-weight:600}
.fineprint{margin-top:2.5rem;color:var(--muted);font-size:.88rem}

/* mobile */
@media (max-width:620px){
  .nav{flex-wrap:wrap;justify-content:center;gap:.4rem .9rem;padding:.7rem 0}
  /* El CTA lleva white-space:nowrap y no encogía: con el nav en una sola fila
     el header se desbordaba horizontalmente (bug previo al cambio de marca).
     Se permite que el grupo derecho haga wrap y que el CTA parta línea. */
  .nav-right{flex-wrap:wrap;justify-content:center;gap:.5rem .9rem;max-width:100%}
  .nav-right>a{white-space:normal;text-align:center}
  .cta-mini{padding:.45rem .8rem;font-size:.88rem}
  .hero{padding:3.5rem 0 2.5rem}
  section{padding:2.75rem 0}
}