/* IA Sin Vueltas — estilos base (Muestra B, oscuro/tech, elegida 14/11/2026).
   Variables y bloques tomados de web/_muestras/b-oscuro.html; no cambiar la paleta sin que Cielo lo pida. */

:root{
  --bg:#08090B; --s1:#101216; --s2:#161A20; --line:#242932; --ink:#F2F4F7; --soft:#A3ABB8;
  --claude:#D97757; --gpt:#E3B341; --gem:#3CC8D6; --ser:#F0629A;
  --ok:#5FD98A; --err:#F0629A;
  --wrap:1120px; --wrap-n:720px;
}
*{box-sizing:border-box;margin:0}
[hidden]{display:none!important}
html{scroll-behavior:smooth;color-scheme:dark}
body{
  background:var(--bg);color:var(--ink);font:400 17px/1.6 "Space Grotesk",system-ui,sans-serif;-webkit-font-smoothing:antialiased;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:64px 64px;background-position:center top;min-height:100vh;
}
body.sin-grilla{background-image:none}
a{color:inherit}
img,video{max-width:100%}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.wrap-n{max-width:var(--wrap-n);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}
.skip:focus{left:12px;top:12px;background:#000;padding:8px 12px;z-index:50;border-radius:6px}
:focus-visible{outline:3px solid var(--claude);outline-offset:3px;border-radius:6px}

header{position:sticky;top:0;z-index:20;background:rgba(8,9,11,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:700;font-size:19px;letter-spacing:-.02em;white-space:nowrap}
.brand svg{width:28px;height:28px;flex:none}
nav.principal{display:flex;gap:28px;font-size:15px;color:var(--soft)}
nav.principal a{text-decoration:none;padding:8px 0;transition:color .2s}
nav.principal a:hover,nav.principal a:focus-visible{color:var(--ink)}
.cabecera-der{display:flex;align-items:center;gap:12px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:10px;
  font:600 16px/1 "Space Grotesk",sans-serif;text-decoration:none;border:1px solid var(--claude);background:var(--claude);color:#0B0B0C;
  transition:transform .15s,box-shadow .2s;cursor:pointer}
.btn:hover{transform:translateY(-1px);box-shadow:0 8px 30px -8px rgba(217,119,87,.55)}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none;box-shadow:none}
.btn.sm{min-height:44px;padding:0 18px;font-size:15px}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--soft);box-shadow:none}
.btn.bloque{width:100%}
.btn.gpt{border-color:var(--gpt);background:var(--gpt)}
.btn.gem{border-color:var(--gem);background:var(--gem)}
.btn.ser{border-color:var(--ser);background:var(--ser)}

.tag{display:inline-flex;align-items:center;gap:8px;font:500 13px/1 "JetBrains Mono",monospace;text-transform:uppercase;letter-spacing:.05em;
  color:var(--soft);border:1px solid var(--line);border-radius:99px;padding:8px 14px;background:var(--s1)}
.tag i{width:7px;height:7px;border-radius:50%;background:var(--claude);box-shadow:0 0 10px var(--claude)}
.pill{font:500 12px/1 "JetBrains Mono",monospace;text-transform:uppercase;letter-spacing:.05em;padding:7px 10px;border-radius:99px;border:1px solid var(--line);color:var(--soft)}
.pill.on{border-color:var(--claude);color:var(--claude)}

h1{font-size:clamp(34px,6vw,62px);line-height:1.04;letter-spacing:-.04em;font-weight:700;margin:0 0 20px}
h1 em{font-style:normal;color:var(--claude)}
h2{font-size:clamp(28px,4.2vw,42px);line-height:1.08;letter-spacing:-.035em;font-weight:700;max-width:18em}
h3{font-size:22px;letter-spacing:-.02em;font-weight:600}
p.lead{font-size:19px;color:var(--soft);max-width:38em}
p.sub{color:var(--soft);margin-top:12px;max-width:36em}
.small{font-size:13.5px!important}
.mono{font:500 13px/1 "JetBrains Mono",monospace;letter-spacing:.05em}

section{padding:72px 0}
section.panel{background:var(--s1);border-block:1px solid var(--line)}
.hero{padding:56px 0 48px}
.hero>.wrap,.hero>.wrap-n{animation:entrada .55s cubic-bezier(.16,1,.3,1) both}
@keyframes entrada{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}

.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:40px}
.grid3{grid-template-columns:repeat(3,1fr)}
.grid2{grid-template-columns:repeat(2,1fr)}
.card{--a:var(--claude);border:1px solid var(--line);border-top:2px solid var(--a);border-radius:14px;padding:24px;background:var(--bg);
  display:flex;flex-direction:column;gap:14px;transition:transform .2s,border-color .2s}
.card:hover{transform:translateY(-2px);border-color:var(--a)}
.card .top{display:flex;justify-content:space-between;align-items:center;gap:10px}
.card .btn{margin-top:auto}
.card.c-gpt{--a:var(--gpt)}
.card.c-gem{--a:var(--gem)}
.card.c-ser{--a:var(--ser)}
.code{font:500 13px/1 "JetBrains Mono",monospace;color:var(--a);letter-spacing:.05em}

.lista-clases{display:grid;gap:12px;margin-top:32px}
.clase{border:1px solid var(--line);border-radius:12px;padding:18px 20px;display:flex;align-items:center;gap:16px;background:var(--s1)}
.clase .num{font:600 15px/1 "JetBrains Mono",monospace;color:var(--claude);border:1px solid var(--line);border-radius:8px;
  width:38px;height:38px;display:flex;align-items:center;justify-content:center;flex:none}
.clase .info{flex:1;min-width:0}
.clase .info h3{font-size:16.5px;margin-bottom:3px}
.clase .info p{color:var(--soft);font-size:14.5px;margin:0}
.clase .dur{font:500 13px/1 "JetBrains Mono",monospace;color:var(--soft);flex:none}

.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{cursor:pointer;font-weight:600;font-size:17px;list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--claude);font-size:22px;font-weight:400;flex:none}
.faq details[open] summary::after{content:"–"}
.faq p{color:var(--soft);margin-top:12px;max-width:40em}

.caja{border:1px solid var(--line);border-radius:14px;background:var(--s1);padding:28px}
.caja.angosta{max-width:460px;margin:0 auto}

form{display:grid;gap:16px}
label{display:block;font-size:14px;color:var(--soft);margin-bottom:6px}
input[type=text],input[type=email],input[type=tel],select{
  width:100%;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:13px 14px;color:var(--ink);
  font:400 16px "Space Grotesk",sans-serif;transition:border-color .15s
}
input:focus-visible,select:focus-visible{border-color:var(--claude)}
.campo-check{display:flex;align-items:flex-start;gap:10px;font-size:14.5px;color:var(--soft)}
.campo-check input{margin-top:3px;flex:none;width:18px;height:18px;accent-color:var(--claude)}
.ayuda{font-size:13px;color:var(--soft);margin-top:4px}

.alerta{border-radius:10px;padding:14px 16px;font-size:14.5px;border:1px solid var(--line);background:var(--s2)}
.alerta.ok{border-color:var(--ok);color:var(--ok)}
.alerta.err{border-color:var(--err);color:var(--err)}
.alerta.info{border-color:var(--claude);color:var(--ink)}

.spinner{width:20px;height:20px;border-radius:50%;border:3px solid var(--line);border-top-color:var(--claude);animation:girar .8s linear infinite;flex:none}
@keyframes girar{to{transform:rotate(360deg)}}

.wa-flotante{position:fixed;bottom:22px;right:22px;z-index:30;width:56px;height:56px;border-radius:50%;background:#25D366;color:#06260F;
  display:flex;align-items:center;justify-content:center;box-shadow:0 10px 30px -8px rgba(0,0,0,.6);text-decoration:none}
.wa-flotante svg{width:28px;height:28px}

footer{border-top:1px solid var(--line);padding:36px 0 44px;font-size:14px;color:var(--soft);background:var(--bg)}
footer .wrap{display:flex;gap:32px;justify-content:space-between;flex-wrap:wrap}
footer .legal-links{display:flex;gap:18px;flex-wrap:wrap;font-size:13.5px}
footer p{max-width:50em}

@media(max-width:980px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .grid3{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:620px){
  nav.principal{display:none}
  section{padding:56px 0}
  .grid,.grid3,.grid2{grid-template-columns:1fr}
  .btn{width:100%}
  header .btn{width:auto}
  body{font-size:16px}
  .clase{flex-wrap:wrap}
  .wa-flotante{width:52px;height:52px;bottom:16px;right:16px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}