:root{
  --bg:#ffffff;--soft:#f6f2fd;--surface:#ffffff;--ink:#1d1430;--muted:#625a75;--line:#e7e0f3;
  --p900:#2a0f55;--p700:#4b1fa0;--p600:#6a2fd6;--p500:#8b55f0;--p200:#dccbfb;--p100:#efe7fe;
  --ok:#1f9d5c;--no:#d0435b;--radius:18px;--shadow:0 12px 34px rgba(75,31,160,.10);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#120b1f;--soft:#1a1129;--surface:#1f1531;--ink:#f3eefc;--muted:#b6abcb;--line:#33264a;
    --p100:#2a1c44;--p200:#3d2a63;--shadow:0 12px 34px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"]{
  --bg:#120b1f;--soft:#1a1129;--surface:#1f1531;--ink:#f3eefc;--muted:#b6abcb;--line:#33264a;
  --p100:#2a1c44;--p200:#3d2a63;--shadow:0 12px 34px rgba(0,0,0,.4);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;line-height:1.65;font-size:17px}
img{max-width:100%;display:block}
a{color:var(--p600)}
h1,h2,h3{line-height:1.2;letter-spacing:-.015em}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.notice{background:var(--p900);color:#fff;font-size:14px;font-weight:600;text-align:center;padding:8px 16px}

header.nav{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:66px;gap:12px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;text-decoration:none;color:var(--ink)}
.logo-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--p500),var(--p700));display:grid;place-items:center;color:#fff}
.menu{display:flex;gap:2px;align-items:center}
.menu a{color:var(--ink);text-decoration:none;font-size:15px;padding:8px 12px;border-radius:999px}
.menu a:hover{background:var(--p100)}
.icon-btn{background:var(--surface);border:1px solid var(--line);color:var(--ink);border-radius:999px;width:40px;height:40px;cursor:pointer;font-size:17px}
.burger{display:none}
@media (max-width:900px){
  .burger{display:inline-block}
  .menu{position:absolute;top:66px;left:0;right:0;flex-direction:column;align-items:stretch;background:var(--bg);border-bottom:1px solid var(--line);padding:10px 16px;display:none}
  .menu.open{display:flex}
}

/* Hero */
.hero{background:radial-gradient(1200px 500px at 85% 10%,#7c3aed55,transparent),linear-gradient(135deg,var(--p900),var(--p700) 60%,var(--p600));color:#fff;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;padding-top:70px;padding-bottom:70px}
.chip{display:inline-block;background:#ffffff22;border:1px solid #ffffff44;font-weight:700;font-size:13px;padding:5px 14px;border-radius:999px;margin-bottom:18px}
.hero h1{font-size:clamp(36px,5.6vw,64px);margin:0 0 18px}
.hero h1 span{background:linear-gradient(90deg,#fff,#d9c6ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{font-size:clamp(17px,2vw,20px);opacity:.9;margin:0 0 28px;max-width:600px}
.hero-img{position:relative}
.hero-img img{border-radius:24px;box-shadow:0 30px 70px rgba(0,0,0,.45);aspect-ratio:4/5;object-fit:cover;width:100%;transform:rotate(2deg);transition:transform .6s}
.hero-img:hover img{transform:rotate(0)}
.float{position:absolute;background:#fff;color:var(--p900);border-radius:14px;padding:10px 14px;font-weight:700;font-size:14px;box-shadow:0 14px 30px rgba(0,0,0,.25);animation:bob 4s ease-in-out infinite}
.float.f1{left:-24px;top:16%}.float.f2{right:-14px;bottom:14%;animation-delay:-2s}
@keyframes bob{50%{transform:translateY(-8px)}}
@media (max-width:860px){.hero .wrap{grid-template-columns:1fr}.hero-img{max-width:420px;margin:0 auto}.float.f1{left:0}.float.f2{right:0}}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--p600);color:#fff;font-weight:700;text-decoration:none;padding:13px 22px;border-radius:999px;border:0;cursor:pointer;font-size:16px}
.hero .btn{background:#fff;color:var(--p700)}
.btn.ghost{background:transparent;color:inherit;border:1.5px solid currentColor}
.hero .btn.ghost{background:transparent;color:#fff}
.btn-row{display:flex;gap:12px;flex-wrap:wrap}

section{padding:84px 0}
.soft{background:var(--soft);border-block:1px solid var(--line)}
.eyebrow{color:var(--p600);font-weight:800;text-transform:uppercase;font-size:13px;letter-spacing:.12em}
.section-title{font-size:clamp(28px,4vw,42px);margin:8px 0 14px}
.lead{color:var(--muted);max-width:720px;font-size:18px}
.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}
@media (max-width:900px){.g3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.g3,.g2{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.card h3{margin:12px 0 8px;font-size:20px}
.card p{margin:0;color:var(--muted)}
.ico{width:48px;height:48px;border-radius:14px;background:var(--p100);display:grid;place-items:center;font-size:24px}
.card:hover .ico{background:var(--p200)}

.independent{display:grid;grid-template-columns:auto 1fr;gap:22px;background:linear-gradient(135deg,var(--p100),var(--surface));border:1px solid var(--p200);border-radius:var(--radius);padding:30px}
.independent .big{font-size:40px}
@media (max-width:600px){.independent{grid-template-columns:1fr}}

/* Generaciones */
.gen-tabs{display:flex;gap:10px;flex-wrap:wrap;margin:26px 0 20px}
.gen-tabs button{border:2px solid var(--line);background:var(--surface);color:var(--ink);font-weight:800;font-size:18px;padding:12px 22px;border-radius:14px;cursor:pointer;transition:.15s}
.gen-tabs button:hover{border-color:var(--p500)}
.gen-tabs button.on{background:var(--p600);border-color:var(--p600);color:#fff;transform:translateY(-2px)}
.gen-panel{display:grid;grid-template-columns:1fr 1fr;gap:26px;align-items:center}
@media (max-width:860px){.gen-panel{grid-template-columns:1fr}}
.gen-info h3{font-size:28px;margin:0 0 6px}
.gen-info .year{color:var(--p600);font-weight:800}
.gen-info ul{color:var(--muted);padding-left:20px}
.meter{margin-top:14px}
.meter label{font-size:14px;font-weight:700;color:var(--muted)}
.meter .track{height:12px;border-radius:12px;background:var(--p100);overflow:hidden;margin:6px 0 12px}
.meter .fill{height:100%;background:linear-gradient(90deg,var(--p500),var(--p700));width:0;transition:width .6s ease}
.photo{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);margin:0;background:var(--surface)}
.photo img{width:100%;object-fit:cover;transition:transform .8s}
.photo:hover img{transform:scale(1.04)}
.photo figcaption{padding:12px 18px;font-size:14px;color:var(--muted)}

/* Llamada paso a paso */
.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:30px}
@media (max-width:860px){.flow{grid-template-columns:1fr}}
.step{background:var(--surface);border:2px solid var(--line);border-radius:16px;padding:18px;text-align:center;transition:.3s;cursor:pointer}
.step .n{font-size:34px}
.step h4{margin:8px 0 4px}
.step p{margin:0;font-size:14px;color:var(--muted)}
.step.on{border-color:var(--p600);background:var(--p100);transform:translateY(-4px);box-shadow:var(--shadow)}
.flow-ctrl{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap;align-items:center}
.flow-text{margin-top:16px;padding:18px 20px;border-left:4px solid var(--p600);background:var(--soft);border-radius:0 12px 12px 0;min-height:60px}

/* Simulador de señal */
.sig{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media (max-width:860px){.sig{grid-template-columns:1fr}}
.ctrl{margin-bottom:22px}
.ctrl label{display:flex;justify-content:space-between;font-weight:700;font-size:15px}
.ctrl label span{color:var(--p600)}
input[type=range]{width:100%;accent-color:var(--p600);margin-top:8px}
.toggles{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.toggles button{border:1.5px solid var(--line);background:var(--bg);color:var(--ink);padding:8px 14px;border-radius:999px;cursor:pointer;font-size:14px}
.toggles button.on{background:var(--p600);color:#fff;border-color:var(--p600)}
.phone{width:200px;margin:0 auto;border:10px solid var(--p900);border-radius:34px;aspect-ratio:9/18;background:linear-gradient(160deg,var(--p100),var(--surface));position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:16px}
.phone::before{content:"";position:absolute;top:8px;width:60px;height:8px;border-radius:8px;background:var(--p900)}
.bars{display:flex;align-items:flex-end;gap:6px;height:70px}
.bars i{width:16px;border-radius:4px;background:var(--line);transition:background .3s}
.bars i:nth-child(1){height:20%}.bars i:nth-child(2){height:40%}.bars i:nth-child(3){height:60%}.bars i:nth-child(4){height:80%}.bars i:nth-child(5){height:100%}
.bars i.on{background:var(--p600)}
.sig-label{font-weight:800;font-size:20px;text-align:center}
.sig-tip{font-size:13px;color:var(--muted);text-align:center}
.disclaimer{font-size:13px;color:var(--muted);margin-top:12px}

/* Glosario */
.search{width:100%;padding:14px 18px;border-radius:14px;border:2px solid var(--line);background:var(--surface);color:var(--ink);font-size:16px;margin:20px 0}
.search:focus{outline:none;border-color:var(--p500)}
.gloss{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.term{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px}
.term b{color:var(--p700);font-size:17px}
:root[data-theme="dark"] .term b{color:var(--p200)}
.term p{margin:6px 0 0;font-size:15px;color:var(--muted)}
.empty{color:var(--muted);display:none}

/* Checklist */
.split{display:grid;grid-template-columns:1fr 1fr;gap:30px;align-items:center}
@media (max-width:860px){.split{grid-template-columns:1fr}}
.check{display:flex;gap:12px;align-items:flex-start;padding:13px 0;border-bottom:1px solid var(--line);cursor:pointer}
.check input{width:20px;height:20px;margin-top:3px;accent-color:var(--p600)}
.check.done span{color:var(--muted);text-decoration:line-through}
.ring{display:flex;align-items:center;gap:14px;margin-top:16px;font-weight:700}
.ring svg{width:64px;height:64px;transform:rotate(-90deg)}

/* Quiz */
.q-progress{height:6px;background:var(--line);border-radius:6px;overflow:hidden;margin-bottom:20px}
.q-progress span{display:block;height:100%;background:var(--p600);width:0;transition:width .3s}
.q-opts{display:grid;gap:10px;margin-top:16px}
.q-opts button{text-align:left;border:1.5px solid var(--line);background:var(--bg);color:var(--ink);padding:14px 16px;border-radius:12px;cursor:pointer;font-size:16px}
.q-opts button:hover:not(:disabled){border-color:var(--p500)}
.q-opts button.right{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 14%,var(--bg))}
.q-opts button.wrong{border-color:var(--no);background:color-mix(in srgb,var(--no) 12%,var(--bg))}
.q-exp{margin-top:14px;color:var(--muted);display:none}
.q-foot{display:flex;justify-content:space-between;align-items:center;margin-top:18px;gap:12px;flex-wrap:wrap}

details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:4px 20px;margin-bottom:10px}
summary{cursor:pointer;font-weight:700;padding:14px 0;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::after{content:"+";font-size:22px;line-height:1;color:var(--p600);transition:.2s}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--muted);margin:0 0 16px}

footer{background:var(--p900);color:#dcd2f0;padding:56px 0 28px;font-size:15px}
footer a{color:#fff}
footer h4{color:#fff;margin:0 0 12px}
.foot-grid{display:grid;grid-template-columns:2fr 1.3fr 1fr;gap:30px}
@media (max-width:760px){.foot-grid{grid-template-columns:1fr}}
footer ul{list-style:none;padding:0;margin:0}
footer li{margin-bottom:6px}
.foot-bottom{border-top:1px solid #ffffff22;margin-top:36px;padding-top:20px;font-size:13px;color:#b9abd8}

.legal{max-width:820px;margin:0 auto;padding:56px 20px 80px}
.legal h1{font-size:clamp(30px,5vw,44px);margin-bottom:6px}
.legal h2{font-size:22px;margin-top:36px;color:var(--p700)}
:root[data-theme="dark"] .legal h2{color:var(--p200)}
.legal .updated{color:var(--muted);font-size:14px}
.legal .box{background:var(--soft);border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;margin:24px 0}
.toc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 24px}
.toc ol{margin:6px 0 0;padding-left:20px}

.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}.float{animation:none}}
.to-top{position:fixed;right:18px;bottom:18px;width:46px;height:46px;border-radius:50%;border:0;background:var(--p600);color:#fff;font-size:20px;cursor:pointer;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:.25s;z-index:60}
.to-top.show{opacity:1;pointer-events:auto}
.progress{position:fixed;top:0;left:0;height:3px;background:var(--p500);width:0;z-index:100}