/* Base visual de Córtex IA. La comparten la página principal y las de
   cada vertical (dental, escolar). El color de acento NO se define
   aquí: cada página lo pisa en su propio <style>, así Dental AI sale
   verde y Escolar AI azul sin tocar este archivo. */

:root{
  --porcelana:#F7F8F6; --tinta:#13253A; --tinta-2:#3D4F60; --gris:#5B6B78; --linea:#DDE3E0;
  /* Acento por omision: Cortex IA. Dental AI y Escolar AI lo pisan. */
  --acento:#2E3A8C; --acento-osc:#222B6B; --acento-suave:#DDE1F3; --acento-tenue:#EEF0FA;
  --aviso:#B8741A; --aviso-bg:#FBF1E1;
  --blanco:#FFFFFF; --acento-chat:#E6E9F7;
  --r-s:8px; --r-m:14px; --r-l:28px;
  --max:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Onest",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--porcelana);color:var(--tinta);font-size:17px;line-height:1.55;-webkit-font-smoothing:antialiased}
img{max-width:100%}
a{color:inherit}
:focus-visible{outline:3px solid var(--acento);outline-offset:3px;border-radius:4px}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
h1,h2,h3{line-height:1.08;letter-spacing:-.025em;margin:0}
h1{font-size:clamp(2.4rem,5.4vw,4.3rem);font-weight:700;max-width:13ch}
h2{font-size:clamp(1.9rem,3.6vw,2.9rem);font-weight:700;max-width:20ch}
h3{font-size:1.2rem;font-weight:600;letter-spacing:-.01em}
p{margin:0}
.lead{font-size:1.2rem;color:var(--tinta-2);max-width:52ch}
section{padding:112px 0}
.sec-intro{display:grid;gap:18px;margin-bottom:56px}
.sec-intro p{color:var(--tinta-2);max-width:60ch}

/* botones */
.btn{display:inline-flex;align-items:center;gap:10px;font:600 1rem/1 "Onest",sans-serif;padding:16px 22px;border-radius:999px;text-decoration:none;border:1.5px solid transparent;cursor:pointer;transition:background .15s,border-color .15s,transform .15s}
.btn:active{transform:translateY(1px)}
.btn-primario{background:var(--acento);color:#fff}
.btn-primario:hover{background:var(--acento-osc)}
.btn-sec{background:transparent;border-color:var(--tinta);color:var(--tinta)}
.btn-sec:hover{background:var(--tinta);color:#fff}
.btn svg{width:18px;height:18px}

/* nav */
header{position:sticky;top:0;z-index:20;background:rgba(247,248,246,.88);-webkit-backdrop-filter:saturate(1.4) blur(12px);backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid transparent;transition:border-color .2s}
header.scrolled{border-bottom-color:var(--linea)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.15rem;text-decoration:none;letter-spacing:-.02em}
.logo-mark{width:30px;height:30px}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a{text-decoration:none;color:var(--tinta-2);font-size:.95rem}
.nav-links a:hover{color:var(--tinta)}
.nav-links a.btn-primario,.nav-links a.btn-primario:hover{color:#fff}
.nav .btn{padding:11px 18px;font-size:.92rem}
@media(max-width:860px){.nav-links a:not(.btn){display:none}}

/* hero */
.hero{padding:72px 0 96px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero .lead{margin:26px 0 36px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px}
.hero-note{margin-top:22px;font-size:.92rem;color:var(--gris)}
@media(max-width:920px){.hero-grid{grid-template-columns:1fr}.hero{padding-top:40px}}

/* teléfono */
.phone{width:min(360px,100%);margin-left:auto;background:var(--tinta);border-radius:44px;padding:12px;box-shadow:0 40px 80px -30px rgba(19,37,58,.45)}
@media(max-width:920px){.phone{margin:0 auto}}
.screen{background:#EFEAE2;border-radius:34px;overflow:hidden;height:560px;display:flex;flex-direction:column}
.chat-top{background:var(--acento-osc);color:#fff;padding:18px 16px 12px;display:flex;gap:10px;align-items:center}
.avatar{width:36px;height:36px;border-radius:50%;background:var(--acento-suave);color:var(--acento-osc);display:grid;place-items:center;font-weight:700;font-size:.85rem}
.chat-top small{display:block;opacity:.8;font-size:.75rem}
.chat-body{flex:1;padding:16px 12px;display:flex;flex-direction:column;justify-content:flex-end;gap:8px;overflow:hidden;font-size:.9rem}
.day{align-self:center;background:#fff;border-radius:8px;padding:3px 10px;font-size:.72rem;color:var(--gris)}
.bubble{max-width:84%;padding:8px 10px 18px;border-radius:10px;position:relative;line-height:1.4;box-shadow:0 1px 0 rgba(0,0,0,.06)}
.bubble time{position:absolute;right:8px;bottom:3px;font-size:.66rem;color:#7a8791}
.in{background:#fff;align-self:flex-start;border-top-left-radius:2px}
.out{background:#D8F7C9;align-self:flex-end;border-top-right-radius:2px}
.badge-rt{align-self:flex-end;font-size:.72rem;color:var(--acento-osc);background:var(--acento-suave);border-radius:999px;padding:3px 10px;font-weight:600}
.typing{align-self:flex-end;background:#D8F7C9;border-radius:10px;padding:10px 14px;display:flex;gap:4px}
.typing i{width:6px;height:6px;border-radius:50%;background:#6b8f77;animation:blink 1s infinite}
.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}
@keyframes blink{0%,80%,100%{opacity:.3}40%{opacity:1}}
.js .reveal{opacity:0;transform:translateY(6px)}
.reveal.on{opacity:1;transform:none;transition:opacity .35s,transform .35s}

/* problema: bandeja */
.problema{background:var(--blanco);border-top:1px solid var(--linea);border-bottom:1px solid var(--linea)}
.prob-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:64px;align-items:start}
@media(max-width:920px){.prob-grid{grid-template-columns:1fr}}
.inbox{border:1px solid var(--linea);border-radius:var(--r-m);overflow:hidden;background:var(--porcelana)}
.inbox-row{display:grid;grid-template-columns:40px 1fr auto;gap:14px;align-items:center;padding:16px 18px;border-bottom:1px solid var(--linea);background:#fff}
.inbox-row:last-child{border-bottom:0}
.inbox-row .avatar{background:#E9ECEB;color:var(--gris)}
.inbox-row strong{display:block;font-weight:600;font-size:.95rem}
.inbox-row span{color:var(--gris);font-size:.9rem;display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.inbox-row>div:nth-child(2){min-width:0}
@media(max-width:560px){.inbox-row{grid-template-columns:36px 1fr;row-gap:6px}.wait{grid-column:2;justify-self:start}}
.wait{font-size:.78rem;color:var(--aviso);background:var(--aviso-bg);padding:4px 10px;border-radius:999px;white-space:nowrap;font-weight:600}
.causes{display:grid;gap:22px;margin-top:36px}
.cause{display:grid;grid-template-columns:10px 1fr;gap:16px}
.cause::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--aviso);margin-top:8px}
.cause p{color:var(--tinta-2)}

/* cómo funciona */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:0;border-top:1px solid var(--tinta)}
.step{padding:28px 22px 0 0}
.step b{display:block;font-size:.9rem;color:var(--acento);font-weight:600;margin-bottom:28px}
.step h3{margin-bottom:10px}
.step p{color:var(--tinta-2);font-size:.96rem}
@media(max-width:920px){.steps{grid-template-columns:1fr 1fr;row-gap:36px}}
@media(max-width:560px){.steps{grid-template-columns:1fr}}

/* demo band */
.demo-band{background:var(--tinta);color:#fff;border-radius:var(--r-l);padding:64px;display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:center}
.demo-band p{color:#C5D0D9;margin-top:18px;max-width:50ch}
.demo-band .btn-primario{background:#fff;color:var(--tinta)}
.demo-band .btn-primario:hover{background:var(--acento-suave)}
.follow{display:grid;gap:12px}
.follow div{display:flex;justify-content:space-between;gap:16px;border-bottom:1px solid rgba(255,255,255,.14);padding-bottom:12px;font-size:.95rem}
.follow div span:last-child{color:#9FE0C4}
@media(max-width:920px){.demo-band{grid-template-columns:1fr;padding:40px 28px}}

/* beneficios */
.benefits{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--linea);border:1px solid var(--linea);border-radius:var(--r-m);overflow:hidden}
.benefit{background:#fff;padding:36px}
.benefit h3{font-size:1.45rem;margin-bottom:10px}
.benefit p{color:var(--tinta-2)}
@media(max-width:760px){.benefits{grid-template-columns:1fr}}

/* funciones */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:40px}
.features h3{padding-bottom:14px;border-bottom:1px solid var(--linea);margin-bottom:14px}
.features ul{list-style:none;padding:0;margin:0;display:grid;gap:10px;color:var(--tinta-2)}
.features li{display:grid;grid-template-columns:18px 1fr;gap:10px}
.features li::before{content:"";width:14px;height:8px;border-left:2px solid var(--acento);border-bottom:2px solid var(--acento);transform:rotate(-45deg);margin-top:6px}
@media(max-width:860px){.features{grid-template-columns:1fr}}

/* implementación */
.impl{background:var(--acento-tenue);border-top:1px solid var(--linea);border-bottom:1px solid var(--linea)}
.timeline{display:grid;grid-template-columns:repeat(6,1fr);position:relative}
.timeline::before{content:"";position:absolute;left:0;right:0;top:15px;height:2px;background:var(--acento);opacity:.25}
.tl{position:relative;padding-right:18px}
.tl i{display:block;width:32px;height:32px;border-radius:50%;background:#fff;border:2px solid var(--acento);margin-bottom:18px;position:relative}
.tl:last-child i{background:var(--acento)}
.tl b{display:block;color:var(--acento-osc);font-size:.9rem;margin-bottom:6px}
.tl p{font-size:.95rem;color:var(--tinta-2)}
@media(max-width:860px){.timeline{grid-template-columns:1fr;gap:22px}.timeline::before{left:15px;right:auto;top:0;bottom:0;width:2px;height:auto}.tl{display:grid;grid-template-columns:48px 1fr;padding:0}.tl i{margin:0}}

/* casos */
.cases{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.case{border:1px solid var(--linea);border-radius:var(--r-m);padding:26px;background:#fff}
.case h3{margin-bottom:10px}
.case p{font-size:.95rem;color:var(--tinta-2)}
.case q{display:block;margin-top:16px;font-size:.9rem;color:var(--tinta);background:var(--acento-chat);padding:10px 12px;border-radius:10px;quotes:none}
@media(max-width:980px){.cases{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.cases{grid-template-columns:1fr}}

/* planes */
.plans{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:stretch}
.plan{background:#fff;border:1px solid var(--linea);border-radius:var(--r-l);padding:40px;display:flex;flex-direction:column}
.plan.pro{border:2px solid var(--tinta)}
.plan h3{font-size:1.5rem}
.plan .for{color:var(--gris);margin:6px 0 26px}
.price{font-size:2.6rem;font-weight:700;letter-spacing:-.03em;line-height:1}
.price small{font-size:1rem;font-weight:500;color:var(--gris);letter-spacing:0}
.impl-fee{margin:10px 0 28px;color:var(--tinta-2)}
.plan ul{list-style:none;padding:0;margin:0 0 32px;display:grid;gap:10px;color:var(--tinta-2);flex:1}
.plan li{display:grid;grid-template-columns:18px 1fr;gap:10px}
.plan li::before{content:"";width:14px;height:8px;border-left:2px solid var(--acento);border-bottom:2px solid var(--acento);transform:rotate(-45deg);margin-top:6px}
.plans-note{margin-top:22px;color:var(--gris);font-size:.93rem;max-width:80ch}
@media(max-width:860px){.plans{grid-template-columns:1fr}.plan{padding:30px}}

/* faq */
.faq{max-width:820px}
details{border-bottom:1px solid var(--linea)}
summary{list-style:none;cursor:pointer;padding:24px 40px 24px 0;font-weight:600;font-size:1.1rem;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"";position:absolute;right:6px;top:32px;width:10px;height:10px;border-right:2px solid var(--tinta);border-bottom:2px solid var(--tinta);transform:rotate(45deg);transition:transform .2s}
details[open] summary::after{transform:rotate(-135deg);top:36px}
details p{padding:0 0 24px;color:var(--tinta-2);max-width:68ch}

/* contacto */
.contact{background:var(--tinta);color:#fff}
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:64px}
.contact h2{color:#fff}
.contact .lead{color:#C5D0D9;margin:22px 0 32px}
.contact .btn-sec{border-color:#fff;color:#fff}
.contact .btn-sec:hover{background:#fff;color:var(--tinta)}
form{background:#fff;color:var(--tinta);border-radius:var(--r-l);padding:36px;display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field{display:grid;gap:6px}
.field.full{grid-column:1/-1}
label{font-size:.9rem;font-weight:600}
input,select,textarea{font:inherit;font-size:1rem;color:var(--tinta);background:var(--porcelana);border:1.5px solid var(--linea);border-radius:var(--r-s);padding:12px 14px;width:100%}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--acento);background:#fff}
textarea{min-height:88px;resize:vertical}
.err-msg{color:#B3261E;font-size:.82rem;min-height:0}
.field.invalid input,.field.invalid select{border-color:#B3261E}
.form-foot{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between}
.form-foot small{color:var(--gris);max-width:36ch}
.form-status{grid-column:1/-1;padding:14px 16px;border-radius:var(--r-s);display:none}
.form-status.ok{display:block;background:var(--acento-suave);color:var(--acento-osc)}
.form-status.bad{display:block;background:#FBE4E2;color:#8C1D18}
.hp{position:absolute;left:-9999px}
button[disabled]{opacity:.6;cursor:wait}
@media(max-width:920px){.contact-grid{grid-template-columns:1fr}form{grid-template-columns:1fr;padding:26px}}

footer{padding:40px 0;color:var(--gris);font-size:.9rem}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
footer .legal{display:flex;gap:20px;flex-wrap:wrap}
footer a{text-decoration:none;color:var(--gris)}
footer a:hover{color:var(--acento)}

@media(max-width:560px){section{padding:80px 0}body{font-size:16px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}.js .reveal{opacity:1;transform:none}}

/* ── entrada al hacer scroll ────────────────────────────────────────────
   Solo se ocultan si hay JS (.js en <html>): sin JS la página se ve entera. */
.js .aparece{opacity:0;transform:translateY(22px)}
.aparece.visible{
  opacity:1;transform:none;
  transition:opacity .7s cubic-bezier(.22,.61,.36,1),transform .7s cubic-bezier(.22,.61,.36,1);
  transition-delay:var(--d,0ms);
}
/* Variante lateral para bloques que entran en pareja */
.js .aparece-izq{opacity:0;transform:translateX(-26px)}
.js .aparece-der{opacity:0;transform:translateX(26px)}
.aparece-izq.visible,.aparece-der.visible{
  opacity:1;transform:none;
  transition:opacity .75s cubic-bezier(.22,.61,.36,1),transform .75s cubic-bezier(.22,.61,.36,1);
  transition-delay:var(--d,0ms);
}

/* ── barra de avance de lectura ───────────────────────────────────────── */
.progreso{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:40;
  background:linear-gradient(90deg,var(--acento),#3DBA92);
  transition:width .08s linear;pointer-events:none;
}

/* ── header que se afina al bajar ─────────────────────────────────────── */
header{transition:border-color .25s,box-shadow .25s,background .25s}
header.scrolled{box-shadow:0 6px 24px -18px rgba(19,37,58,.5)}
header.scrolled .nav{height:60px}
.nav{transition:height .25s}

/* ── micro-interacciones ──────────────────────────────────────────────── */
.step,.benefit,.case,.plan{transition:transform .25s cubic-bezier(.22,.61,.36,1),box-shadow .25s}
.benefit:hover,.case:hover{transform:translateY(-3px)}
.plan:hover{transform:translateY(-4px);box-shadow:0 26px 50px -34px rgba(19,37,58,.45)}
.step:hover b{color:var(--acento-osc)}
.step b{transition:color .2s}
.btn{transition:background .18s,border-color .18s,transform .18s,box-shadow .18s}
.btn-primario:hover{box-shadow:0 12px 26px -14px rgba(20,122,92,.85)}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(1px)}
.inbox-row{transition:background .2s}
.inbox-row:hover{background:var(--acento-tenue)}

/* ── el teléfono flota apenas al hacer scroll ─────────────────────────── */
.phone{transition:transform .6s cubic-bezier(.22,.61,.36,1)}
.phone.flota{transform:translateY(var(--flota,0px))}

@media(prefers-reduced-motion:reduce){
  .js .aparece,.js .aparece-izq,.js .aparece-der{opacity:1!important;transform:none!important}
  .progreso{display:none}
  .phone.flota{transform:none!important}
}