/* ═══════════════════════════════════════════════════════════════════
   ESTRATO CONDUCTOR · kahainnovations.cl
   ───────────────────────────────────────────────────────────────────
   Una idea rectora: la marca se llama Estrato y lo que vende es saber
   qué hay DEBAJO de la superficie. Todo el sistema obedece a eso —
   capas que se separan, un testigo de sondaje que descubre lo que
   está tapado, y una veta de cobre que atraviesa la página entera.

   El movimiento vive en tres capas, de más a menos frágil:
     · WebGL   — el substrato procedural (con degradado CSS de reserva)
     · CSS scroll-driven — separación de capas, veta, revelados
     · JS mínimo — sonda, cinética del titular, medición
   Nada es obligatorio: sin WebGL, sin JS o con reduced-motion, la
   página se lee completa y sigue siendo la misma página.
   ═══════════════════════════════════════════════════════════════════ */

@font-face{font-family:'Sora';src:url('fonts/sora-latin-400-normal.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Sora';src:url('fonts/sora-latin-600-normal.woff2') format('woff2');font-weight:600;font-display:swap}
@font-face{font-family:'Sora';src:url('fonts/sora-latin-700-normal.woff2') format('woff2');font-weight:700;font-display:swap}
@font-face{font-family:'Sora';src:url('fonts/sora-latin-800-normal.woff2') format('woff2');font-weight:800;font-display:swap}
@font-face{font-family:'Inter';src:url('fonts/inter-latin-400-normal.woff2') format('woff2');font-weight:400;font-display:swap}
@font-face{font-family:'Inter';src:url('fonts/inter-latin-500-normal.woff2') format('woff2');font-weight:500;font-display:swap}
@font-face{font-family:'Inter';src:url('fonts/inter-latin-600-normal.woff2') format('woff2');font-weight:600;font-display:swap}
@font-face{font-family:'Inter';src:url('fonts/inter-latin-700-normal.woff2') format('woff2');font-weight:700;font-display:swap}

/* ── Tokens ──────────────────────────────────────────────────────── */
:root{
  --obsidian:#151719; --obsidian-soft:#1D2124; --iron:#62686C;
  --limestone:#EFE8DB; --limestone-deep:#E2D8C7;
  --copper:#C66A3D; --copper-lift:#D8804F;

  --ink:var(--obsidian);
  --ink-soft:#5A6064;
  --ground:var(--limestone);
  --ground-lift:var(--limestone-deep);
  --veil:rgba(239,232,219,.72);      /* velo sobre el substrato, para leer */
  --veil-solid:rgba(239,232,219,.94);
  --line:rgba(21,23,25,.16);
  --line-soft:rgba(21,23,25,.08);
  --copper-ink:#954922;              /* el cobre de marca no llega a 4.5:1 sobre caliza */

  --shell:min(1240px, 100% - 3rem);
  --gutter:max(1.5rem, (100vw - 1240px) / 2);
  --rhythm:clamp(6rem, 13vw, 11rem);
  --ease:cubic-bezier(.16,1,.3,1);
  --ease-suave:cubic-bezier(.22,.61,.36,1);
}
@media (prefers-color-scheme:dark){
  :root{
    --ink:var(--limestone); --ink-soft:#8A9095;
    --ground:var(--obsidian); --ground-lift:var(--obsidian-soft);
    --veil:rgba(21,23,25,.66); --veil-solid:rgba(21,23,25,.92);
    --line:rgba(239,232,219,.18); --line-soft:rgba(239,232,219,.09);
    --copper-ink:var(--copper-lift);
  }
}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:4.5rem}
body{
  background:var(--ground);color:var(--ink);
  font-family:'Inter',system-ui,sans-serif;font-size:17px;line-height:1.6;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
::selection{background:var(--copper);color:var(--limestone)}
:focus-visible{outline:2px solid var(--copper-ink);outline-offset:3px;border-radius:2px}
.shell{width:var(--shell);margin-inline:auto;position:relative}
.lede{font-size:clamp(1.05rem,2vw,1.3rem);color:var(--ink-soft);max-width:46ch}

/* ── El substrato ────────────────────────────────────────────────── */
#substrato{position:fixed;inset:0;z-index:-2;width:100%;height:100%;display:block}
/* Reserva cuando no hay WebGL: mismo espíritu, cero coste. */
.sin-webgl #substrato{display:none}
.reserva{position:fixed;inset:0;z-index:-2;display:none;
  background:
    repeating-linear-gradient(to bottom, var(--line-soft) 0 1px, transparent 1px 96px),
    radial-gradient(120% 80% at 50% 0%, var(--ground-lift), var(--ground) 70%)}
.sin-webgl .reserva{display:block}

/* Velo: el texto necesita un suelo estable sobre la roca. */
.velo{position:relative;isolation:isolate}
.velo::before{content:"";position:absolute;inset:0;z-index:-1;background:var(--veil);
  backdrop-filter:blur(2px)}

/* ── Tipografía ──────────────────────────────────────────────────── */
h1,h2,h3{font-family:'Sora',sans-serif;letter-spacing:-.03em;line-height:1.02;text-wrap:balance}
h1{font-weight:800;font-size:clamp(2.5rem,min(7.4vw,10.5vh),5.6rem)}
h2{font-weight:700;font-size:clamp(2.1rem,5.2vw,3.9rem);line-height:1.04}
h3{font-weight:600;font-size:clamp(1.15rem,2vw,1.4rem);line-height:1.22;letter-spacing:-.02em}
p{text-wrap:pretty}

.eyebrow{font-size:.72rem;font-weight:600;letter-spacing:.22em;text-transform:uppercase;
  color:var(--copper-ink);display:flex;align-items:center;gap:.9rem}
.eyebrow::before{content:attr(data-index);font-variant-numeric:tabular-nums;
  color:var(--ink-soft);font-weight:500;letter-spacing:.08em}
.vein{width:96px;height:4px;background:var(--copper);border-radius:1px}

/* Cinética del titular: cada palabra emerge de su propio corte. */
.kin{display:inline-block;overflow:hidden;vertical-align:bottom;padding-bottom:.06em}
.kin__i{display:inline-block;will-change:transform}
.kin--listo .kin__i{
  transform:translate3d(0,110%,0);
  animation:emerger .95s var(--ease) forwards;
  animation-delay:calc(var(--i) * 55ms + 120ms);
}
@keyframes emerger{to{transform:none}}
@media (prefers-reduced-motion:reduce){
  .kin--listo .kin__i{transform:none;animation:none}
}

/* ── Encabezado ──────────────────────────────────────────────────── */
.masthead{position:sticky;top:0;z-index:60;
  background:color-mix(in srgb, var(--ground) 76%, transparent);
  backdrop-filter:blur(16px) saturate(1.2);border-bottom:1px solid var(--line-soft)}
.masthead .shell{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1rem 0}
.wordmark{font-family:'Sora';font-weight:700;font-size:1rem;text-decoration:none;color:var(--ink);
  display:flex;align-items:center;gap:.65rem;letter-spacing:-.02em}
.wordmark::before{content:"";width:26px;height:4px;background:var(--copper);border-radius:1px;
  transition:width .5s var(--ease)}
.wordmark:hover::before{width:44px}
.masthead nav{display:flex;gap:1.6rem;font-size:.9rem;font-weight:500}
.masthead nav a{color:var(--ink-soft);text-decoration:none;position:relative;
  transition:color .3s var(--ease-suave)}
.masthead nav a::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:1px;
  background:var(--copper);transform:scaleX(0);transform-origin:0 50%;
  transition:transform .45s var(--ease)}
.masthead nav a:hover{color:var(--ink)}
.masthead nav a:hover::after{transform:scaleX(1)}
@media (max-width:760px){
  .masthead nav{gap:1.1rem;font-size:.84rem}
  .masthead nav a[data-opt]{display:none}
}
/* A 390 px el menú se salía de la pantalla —«Contacto» quedaba cortado por el
   borde— y la marca se partía en dos líneas. En un móvil el encabezado sólo
   tiene que hacer dos cosas: decir quién eres y ofrecer el contacto. */
@media (max-width:620px){
  .wordmark{white-space:nowrap;font-size:.95rem}
  .masthead nav a:not([href="#contacto"]){display:none}
  .masthead nav a[href="#contacto"]{color:var(--copper)}
}
.progress{position:absolute;left:0;bottom:-1px;height:2px;width:100%;background:var(--copper);
  transform-origin:0 50%;transform:scaleX(0)}

/* ── PORTADA · el corte de sondaje ───────────────────────────────── */
.hero{min-height:100svh;display:grid;align-content:center;padding:6rem 0 4rem;
      position:relative}
.corte{position:relative}

/* El titular se lee siempre, entero. La portada no juega con eso: lo que
   demuestra capacidad es la instrumentación de más abajo, no esconder texto. */
.corte{display:grid}

/* ── Registro de sondaje ─────────────────────────────────────────── */
.registro-sec .registro{border-top:1px solid var(--line)}
.registro{display:grid;font-variant-numeric:tabular-nums}
.registro__f{display:grid;grid-template-columns:8rem minmax(6rem,1fr) 12rem;gap:1.4rem;
  align-items:center;font-size:.86rem;letter-spacing:.02em;color:var(--copper-ink);
  border-bottom:1px solid var(--line);padding:1.15rem 0}
.registro__p{font-weight:700;white-space:nowrap;color:var(--ink)}
.registro__v{font-weight:700;text-align:right;white-space:nowrap}

/* La escala: ticks continuos más el tramo medido. */
.registro__e{position:relative;height:16px}
.registro__e::before{content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(to right,
    color-mix(in srgb, var(--ink) 30%, transparent) 0 1px, transparent 1px 10px)}
.registro__e::after{content:"";position:absolute;left:0;top:6px;height:4px;
  width:var(--f,50%);background:var(--copper);transform-origin:0 50%}
@media (max-width:700px){
  .registro__f{grid-template-columns:5.5rem minmax(3rem,1fr) 7.5rem;gap:.8rem;font-size:.74rem}
}

.hero .lede{margin-top:2rem}
.sub{font-family:'Sora';font-weight:600;font-size:clamp(.95rem,1.5vw,1.15rem);
  letter-spacing:-.01em;line-height:1.45;max-width:34ch;margin-top:2rem}
.pista{display:flex;align-items:center;gap:.8rem;margin-top:3rem;
  font-size:.74rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-soft)}
.pista i{display:block;width:44px;height:1px;background:var(--copper);transform-origin:0 50%;
  animation:sondear 2.6s var(--ease-suave) infinite}
@keyframes sondear{0%,100%{transform:scaleX(.3);opacity:.4}50%{transform:scaleX(1);opacity:1}}
@media (prefers-reduced-motion:reduce){.pista i{animation:none;transform:scaleX(1)}}

.hero-foot{display:flex;flex-wrap:wrap;gap:1rem;align-items:center;margin-top:2.8rem}
.btn{display:inline-flex;align-items:center;gap:.7rem;padding:1rem 1.6rem;
  border:1px solid var(--ink);border-radius:2px;font-weight:600;font-size:.95rem;
  text-decoration:none;color:var(--ink);position:relative;overflow:hidden;isolation:isolate;
  transform:translate3d(var(--ix,0),var(--iy,0),0);
  transition:color .4s var(--ease),transform .5s var(--ease)}
.btn::after{content:"";position:absolute;inset:0;z-index:-1;background:var(--ink);
  transform:scaleY(0);transform-origin:50% 100%;transition:transform .5s var(--ease)}
.btn:hover{color:var(--ground)}
.btn:hover::after{transform:scaleY(1)}
.btn--copper{border-color:var(--copper-ink);color:var(--copper-ink)}
.btn--copper::after{background:var(--copper-ink)}
.btn--copper:hover{color:var(--limestone)}

/* ── Secciones ───────────────────────────────────────────────────── */
section{padding-block:var(--rhythm);position:relative}
.section-head{display:grid;gap:1.4rem;margin-bottom:4rem;max-width:64ch}
.split{display:grid;gap:clamp(2rem,5vw,5rem);grid-template-columns:1fr}
@media (min-width:920px){.split{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr)}}
.rule{height:1px;background:var(--line);transform-origin:0 50%}

/* ── EXCAVACIÓN · las capas se separan al hacer scroll ───────────── */
.excavacion{perspective:1400px;perspective-origin:50% 40%}
.pila{display:grid;gap:0;transform-style:preserve-3d}
.lamina{
  border:1px solid var(--line);border-radius:3px;
  background:var(--veil-solid);backdrop-filter:blur(6px);
  padding:clamp(1.5rem,3vw,2.2rem) clamp(1.5rem,3.5vw,2.6rem);
  display:grid;gap:.6rem;position:relative;
  transform-origin:50% 100%;
}
.pila > * + *{margin-top:-1px}
.lamina__t{font-family:'Sora';font-weight:600;font-size:clamp(1rem,1.8vw,1.2rem);letter-spacing:-.02em}
.lamina p{color:var(--ink-soft);font-size:.97rem;max-width:60ch}
.lamina__m{font-size:.72rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;
  color:var(--copper-ink)}
.lamina--superficie{background:var(--ground-lift)}
.lamina--fondo{border-color:color-mix(in srgb, var(--copper) 45%, transparent)}

/* ── MEDICIÓN · la sonda de versiones ────────────────────────────── */
.medicion{display:grid;gap:2rem}
@media (min-width:980px){.medicion{grid-template-columns:minmax(0,1fr) 22rem;align-items:start}}
#rejilla-medicion{display:grid;grid-template-columns:2.8rem repeat(12,minmax(0,1fr));
  gap:4px;align-items:center}
.anio{font-size:.68rem;font-weight:700;letter-spacing:.06em;color:var(--ink-soft);
  font-variant-numeric:tabular-nums;justify-self:end;padding-right:.4rem}
@media (max-width:700px){
  #rejilla-medicion{grid-template-columns:2.1rem repeat(12,minmax(0,1fr));gap:2px}
  .anio{font-size:.56rem;padding-right:.2rem}
}
.celda{
  aspect-ratio:1;border:1px solid var(--line);border-radius:2px;background:transparent;
  cursor:pointer;position:relative;overflow:hidden;padding:0;
  display:grid;place-items:center;
  transition:transform .35s var(--ease),border-color .35s var(--ease),background .35s var(--ease);
  animation:asentar .6s var(--ease) both;
  animation-delay:calc(var(--n) * 9ms);
}
@keyframes asentar{from{opacity:0;transform:translate3d(0,12px,0) scale(.9)}to{opacity:1;transform:none}}
.celda__v{font-size:.66rem;font-weight:700;letter-spacing:.02em;color:var(--ink-soft);
  font-variant-numeric:tabular-nums;opacity:.55;transition:opacity .3s var(--ease)}
.celda--viva{background:color-mix(in srgb, var(--copper) 24%, transparent);
  border-color:color-mix(in srgb, var(--copper) 62%, transparent)}
.celda--viva .celda__v{color:var(--ink)}   /* el tinte de cobre sube el fondo: el gris ya no basta */
.celda--viva::after{content:"";position:absolute;inset:0;
  background:radial-gradient(circle at 50% 50%, color-mix(in srgb, var(--copper) 55%, transparent), transparent 70%);
  opacity:0;transition:opacity .45s var(--ease)}
.celda:hover,.celda:focus-visible{transform:translateY(-3px) scale(1.08);border-color:var(--copper);z-index:2}
.celda:hover .celda__v,.celda:focus-visible .celda__v{opacity:1}
.celda--viva .celda__v{opacity:.9}
.celda--viva:hover::after{opacity:1}
@media (prefers-reduced-motion:reduce){.celda{animation:none}}

.lectura{border:1px solid var(--line);border-radius:3px;background:var(--veil-solid);
  backdrop-filter:blur(6px);padding:1.5rem;display:grid;gap:.7rem;min-height:11rem;align-content:start}
.lectura__v{font-family:'Sora';font-weight:800;font-size:2rem;letter-spacing:-.03em;
  font-variant-numeric:tabular-nums}
.lectura__e{font-size:.74rem;font-weight:700;letter-spacing:.16em}
.es-viva{color:var(--copper-ink)}
.es-muerta{color:var(--ink-soft)}
.lectura__d{font-size:.92rem;color:var(--ink-soft);line-height:1.5}
.lectura__pie{font-size:.8rem;color:var(--ink-soft);border-top:1px solid var(--line);
  padding-top:.8rem;margin-top:.3rem}

/* ── Servicios ───────────────────────────────────────────────────── */
.band{border-block:1px solid var(--line);
  padding-inline:calc(var(--gutter) - clamp(2rem,3.6vw,3rem))}
.services{display:grid;gap:1px;background:var(--line)}
@media (min-width:880px){.services{grid-template-columns:1fr 1fr}}
.service{background:var(--ground);padding:clamp(2rem,3.6vw,3.2rem);display:grid;gap:1rem;
  align-content:start;position:relative;overflow:hidden;
  transition:background .5s var(--ease)}
.service::before{content:"";position:absolute;left:0;top:0;width:3px;height:100%;
  background:var(--copper);transform:scaleY(0);transform-origin:50% 0;
  transition:transform .6s var(--ease)}
.service:hover{background:var(--ground-lift)}
.service:hover::before{transform:scaleY(1)}
.service .num{font-size:.72rem;font-weight:600;letter-spacing:.2em;color:var(--ink-soft);
  font-variant-numeric:tabular-nums}
.service p{color:var(--ink-soft);font-size:.98rem;max-width:48ch}
.service ul{list-style:none;display:flex;flex-wrap:wrap;gap:.45rem;margin-top:.4rem}
.service li{font-size:.78rem;font-weight:500;color:var(--ink-soft);
  border:1px solid var(--line);border-radius:2px;padding:.32rem .62rem}

/* ── Proceso ─────────────────────────────────────────────────────── */
.steps{display:grid;position:relative}
.step{display:grid;padding:2.1rem 0;border-top:1px solid var(--line);
  grid-template-columns:auto 1fr;column-gap:clamp(1.2rem,4vw,3.5rem);align-items:baseline}
.step:last-child{border-bottom:1px solid var(--line)}
.step .k{font-family:'Sora';font-weight:700;font-size:clamp(1.7rem,4vw,2.6rem);
  color:var(--copper-ink);font-variant-numeric:tabular-nums;line-height:1}
.step h3{grid-column:2}
.step p{grid-column:2;color:var(--ink-soft);max-width:58ch;font-size:.98rem;margin-top:.4rem}

/* ── Prueba ──────────────────────────────────────────────────────── */
.proof{border:1px solid var(--line);border-radius:3px;padding:clamp(2rem,4vw,3.4rem);
  background:var(--veil-solid);backdrop-filter:blur(6px);display:grid;gap:1.4rem}
.proof .facts{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);
  border-radius:2px;overflow:hidden;margin-top:.6rem}
@media (min-width:700px){.proof .facts{grid-template-columns:repeat(3,1fr)}}
.fact{background:var(--ground);padding:1.3rem 1.4rem;display:grid;gap:.35rem}
.fact dt{font-size:.72rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--ink-soft)}
.fact dd{font-family:'Sora';font-weight:700;font-size:1.05rem;letter-spacing:-.01em}

/* ── Cierre y pie ────────────────────────────────────────────────── */
.closing h2{max-width:19ch}
.contact{display:flex;flex-wrap:wrap;gap:1rem;margin-top:2.4rem}
footer{border-top:1px solid var(--line);padding:2.4rem 0 3.5rem;color:var(--ink-soft);font-size:.88rem;
  background:var(--veil-solid)}
footer .shell{display:flex;flex-wrap:wrap;gap:.8rem 2rem;justify-content:space-between}
footer a{color:inherit;text-decoration-color:var(--copper);text-underline-offset:3px}
footer a:hover{color:var(--ink)}

/* ═══ MOVIMIENTO DIRIGIDO POR SCROLL ═════════════════════════════
   Mejora progresiva pura. Sin soporte, todo queda en su estado final:
   nunca hay contenido invisible, que es el modo de falla clásico. */
@supports (animation-timeline: view()){
  @media (prefers-reduced-motion: no-preference){
    @keyframes rise{from{opacity:0;transform:translate3d(0,32px,0)}to{opacity:1;transform:none}}
    @keyframes unfurl{from{transform:scaleX(0)}to{transform:scaleX(1)}}
    @keyframes fill{to{transform:scaleX(1)}}
    /* La excavación: las láminas se separan y se inclinan al pasar. */
    @keyframes excavar{
      from{opacity:.62;transform:translate3d(0,60px,0) rotateX(14deg) scale(.965)}
      to  {opacity:1;  transform:none}
    }
    @keyframes hundir{ to{opacity:.68;transform:translate3d(0,-30px,0) rotateX(-8deg) scale(.985)} }

    .reveal{animation:rise linear both;animation-timeline:view();animation-range:entry 5% cover 26%}
    .stagger > *{animation:rise linear both;animation-timeline:view();animation-range:entry 2% cover 22%}
    .rule{animation:unfurl linear both;animation-timeline:view();animation-range:entry 20% cover 32%}
    .progress{animation:fill linear both;animation-timeline:scroll(root block)}

    @keyframes llenar{from{transform:scaleX(0)}to{transform:scaleX(1)}}
    .registro__e::after{animation:llenar linear both;animation-timeline:view();
      animation-range:entry 10% cover 30%}

    .lamina{animation:excavar linear both;animation-timeline:view();
            animation-range:entry 0% cover 30%}
    .lamina--superficie{animation:excavar linear both, hundir linear both;
            animation-timeline:view(), view();
            animation-range:entry 0% cover 30%, cover 45% cover 90%}
  }
}
/* El encabezado es fijo: sin esto, cada enlace del menú deja el título
   debajo de la barra. Latente hoy porque las secciones tienen holgura
   arriba; deja de serlo en cuanto alguien la reduzca. */
main > section[id]{scroll-margin-top:calc(var(--h-masthead, 59px) + 1.5rem)}

@view-transition{navigation:auto}
@media (prefers-reduced-motion:no-preference){
  ::view-transition-old(root){animation:vt-out .3s var(--ease-suave) both}
  ::view-transition-new(root){animation:vt-in .45s var(--ease) both}
  @keyframes vt-out{to{opacity:0;transform:translate3d(0,-14px,0)}}
  @keyframes vt-in{from{opacity:0;transform:translate3d(0,20px,0)}}
}

/* ── Páginas de texto ────────────────────────────────────────────── */
.prose{max-width:70ch}
.prose h2{font-size:clamp(1.4rem,2.6vw,1.9rem);margin:3rem 0 .9rem}
.prose h2:first-of-type{margin-top:1.5rem}
.prose p,.prose ul{margin-bottom:1rem}
.prose ul{margin-left:1.2rem}
.prose li{margin-bottom:.5rem}
.prose a{color:var(--ink);text-decoration-color:var(--copper);text-decoration-thickness:2px;
  text-underline-offset:3px}
.prose a:hover{color:var(--copper-ink)}
.prose code{font-size:.9em;background:var(--ground-lift);padding:.1em .35em;border-radius:2px}
.nota{background:var(--ground-lift);border-left:4px solid var(--copper);padding:1.1rem 1.4rem;margin:1.6rem 0}
.nota p:last-child{margin-bottom:0}