:root{
  --brand:#B3202A; --brand-dark:#8E1820; --brand-soft:#fbeeee;
  --bg:#ffffff; --ink:#111111; --muted:#6b6b6b; --eyebrow:#8a8a8a; --line:#e5e5e5; --card:#ffffff; --soft:#f6f6f4;
  --dark:#111114; --dark-2:#1a1a1f; --dark-line:#2a2a31; --dark-ink:#f1f1f3; --dark-muted:#8d8d98;
  --font:"Helvetica Neue",Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--bg);color:var(--ink)}
body{font-family:var(--font);-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
.wrap{max-width:1040px;margin:0 auto;padding:28px 16px 40px}
.narrow{max-width:720px;margin:0 auto}

.eyebrow{font-size:12px;font-weight:500;letter-spacing:.22em;text-transform:uppercase;color:var(--eyebrow)}
.center{text-align:center}
.rule{width:72px;height:4px;background:var(--ink);margin-top:14px}
.center .rule,.rule.c{margin-left:auto;margin-right:auto}
.red{color:var(--brand)}
h1{font-weight:700;letter-spacing:-.025em;line-height:1.06;font-size:clamp(30px,4.6vw,52px)}
h2{font-weight:700;letter-spacing:-.02em;line-height:1.15;font-size:clamp(22px,3vw,30px)}
.lead{color:var(--muted);font-size:18px;line-height:1.5;margin-top:14px}
.pill{display:inline-flex;align-items:center;gap:8px;background:var(--brand-soft);color:var(--brand);font-weight:700;font-size:12px;letter-spacing:.12em;text-transform:uppercase;padding:7px 12px;border-radius:999px}
.pill i{width:8px;height:8px;border-radius:50%;background:var(--brand);display:inline-block;animation:pulse 1.6s infinite}
@keyframes pulse{50%{opacity:.35}}

/* tarjeta formulario */
.card{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:26px 28px;box-shadow:0 24px 60px -30px rgba(0,0,0,.28)}
label{display:block;font-size:14px;font-weight:700;margin:14px 0 6px}
input{width:100%;font:16px var(--font);padding:14px 16px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink)}
input:focus{outline:2px solid var(--brand);outline-offset:-1px;border-color:transparent}
.cta{display:block;width:100%;margin-top:20px;border:0;border-radius:12px;padding:18px;font:700 17px var(--font);color:#fff;cursor:pointer;text-align:center;text-decoration:none;background:var(--brand);box-shadow:0 12px 30px -12px var(--brand);letter-spacing:.01em}
.cta:hover{background:var(--brand-dark)}
.cta:disabled{opacity:.6;cursor:wait}
.small{font-size:12.5px;color:var(--muted);line-height:1.5;margin-top:12px;text-align:center}
.err{color:var(--brand);font-size:13px;margin-top:8px;display:none}

/* "pantalla" de vídeo */
.screen{position:relative;background:var(--dark);border-radius:16px;overflow:hidden;aspect-ratio:16/9;box-shadow:0 30px 70px -30px rgba(0,0,0,.5)}
.screen .play{position:absolute;inset:0;margin:auto;width:76px;height:76px;border-radius:50%;background:var(--brand);display:grid;place-items:center;box-shadow:0 0 0 12px rgba(179,32,42,.25)}
.screen .chip{position:absolute;left:14px;top:14px;background:rgba(0,0,0,.55);color:#fff;font-size:12px;font-weight:700;padding:6px 10px;border-radius:6px;letter-spacing:.04em}
.screen .cap{position:absolute;left:18px;bottom:16px;right:18px;color:#fff;font-weight:700;font-size:clamp(16px,2.2vw,22px);line-height:1.2}
.screen .bars{position:absolute;inset:auto 0 0 0;height:4px;background:rgba(255,255,255,.15)}
.screen .bars i{display:block;width:34%;height:100%;background:var(--brand)}

/* listas */
.learn{display:grid;gap:14px;margin-top:22px}
.learn li{list-style:none;display:flex;gap:16px;align-items:flex-start;padding:18px;border:1px solid var(--line);border-radius:14px;background:#fff}
.learn b{font-size:24px;color:var(--brand);font-weight:700;min-width:36px}
.learn h3{font-size:17px;margin-bottom:4px}
.learn p{color:var(--muted);font-size:15px;line-height:1.45}

/* quiz */
.bar{height:4px;background:var(--line);border-radius:4px;overflow:hidden;margin-bottom:18px}
.bar i{display:block;height:100%;width:0;background:var(--brand);transition:width .35s ease}
.qhead{margin-bottom:18px}
.q{font-weight:700;letter-spacing:-.02em;font-size:clamp(21px,3vw,28px);line-height:1.15;margin-top:8px}
.opt{display:flex;width:100%;align-items:center;justify-content:space-between;gap:12px;text-align:left;font:500 17px/1.3 var(--font);color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin-bottom:10px;cursor:pointer;transition:.15s}
.opt:hover,.opt:focus-visible{border-color:var(--brand);background:var(--brand-soft);outline:none}
.opt svg{flex:none;color:var(--muted)}
.back{background:none;border:0;color:var(--muted);font:500 14px var(--font);cursor:pointer;margin-top:4px;padding:6px 0}
.step{animation:in .3s ease}
@keyframes in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

footer{max-width:720px;margin:36px auto 0;text-align:center;font-size:12px;color:var(--muted);line-height:1.6}
footer p+p{margin-top:8px}

@media (max-width:760px){
  .wrap{padding:16px 14px 28px}
  .card{padding:18px 16px;border-radius:16px}
  .lead{font-size:16px}
  .opt{font-size:15.5px;padding:13px 14px}
  .screen .play{width:58px;height:58px}
}