/* LicenciaRD — hoja de estilo de las páginas de estudio.
   Mismo sistema visual del landing: Nunito + azul #3983F8. */
*{box-sizing:border-box;margin:0;padding:0;font-family:"Nunito",sans-serif;-webkit-font-smoothing:antialiased}
:root{
  --primary:#3983F8;--primary-dark:#1E6BEB;--primary-shadow:#88B4FB;
  --navy:#0F172A;--text-dark:#101828;--text-muted:#64748B;--text-soft:#A5B2C7;
  --bg-light:#F7FAFF;--border-subtle:#ECF1F8;--tint-soft:#EFF6FF;
}
body{background:#fff;color:var(--text-dark);line-height:1.65}
a{color:inherit;text-decoration:none}

.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border-subtle)}
.brand{display:flex;align-items:center;justify-content:center;max-width:1100px;margin:0 auto;padding:11px 24px}
.brand img{display:block;height:38px;width:auto}

.bc{max-width:820px;margin:0 auto;padding:16px 24px 0;font-size:13px;font-weight:700;color:var(--text-soft)}
.bc a{color:var(--primary)}
.bc a:hover{text-decoration:underline}
.bc span{margin:0 2px}
.bc-here{color:var(--text-soft)}

.wrap{max-width:820px;margin:0 auto;padding:18px 24px 72px}

.eyebrow{font-size:13px;font-weight:800;letter-spacing:.8px;text-transform:uppercase;color:var(--primary);margin-bottom:10px}
h1{font-size:clamp(27px,4vw,40px);font-weight:900;line-height:1.18;letter-spacing:-.02em;color:var(--text-dark);margin-bottom:16px}
.lead{font-size:17px;color:var(--text-muted);line-height:1.7;margin-bottom:30px}
.lead b{font-weight:800;color:var(--text-dark)}

.toc{background:var(--bg-light);border:1.5px solid var(--border-subtle);border-radius:16px;padding:22px 24px;margin-bottom:38px}
.toc-h{font-size:12px;font-weight:900;letter-spacing:.8px;text-transform:uppercase;color:var(--text-soft);margin-bottom:12px}
.toc ol{padding-left:20px;display:grid;gap:7px}
.toc li{font-size:14.5px;font-weight:600;color:#334155}
.toc a{color:#334155}
.toc a:hover{color:var(--primary);text-decoration:underline}

.q{padding:26px 0;border-top:1px solid var(--border-subtle)}
.q-meta{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.q-num{font-size:12px;font-weight:900;letter-spacing:.7px;text-transform:uppercase;color:var(--primary)}
.q-dif{font-size:12px;font-weight:700;color:var(--text-soft)}
.q h2{font-size:21px;font-weight:900;line-height:1.32;color:var(--text-dark);margin-bottom:14px;letter-spacing:-.01em}
.opts{list-style:none;display:grid;gap:8px;margin-bottom:16px}
.opts li{display:flex;align-items:flex-start;gap:10px;font-size:15.5px;font-weight:600;color:#475569;
  background:#fff;border:1.5px solid var(--border-subtle);border-radius:12px;padding:11px 14px}
.opts li.ok{background:var(--tint-soft);border-color:var(--primary);color:var(--primary-dark);font-weight:800}
.opts li.ok b{font-weight:900;margin-left:4px;white-space:nowrap}
.let{flex:0 0 auto;width:20px;height:20px;border-radius:50%;background:#EEF2F6;color:#94A3B8;
  font-size:11px;font-weight:900;display:flex;align-items:center;justify-content:center;margin-top:2px}
.opts li.ok .let{background:var(--primary);color:#fff}
.exp{font-size:16px;color:#334155;line-height:1.7;margin-bottom:8px}
.exp b{font-weight:900;color:var(--text-dark)}
.tip{font-size:15px;font-weight:700;color:var(--primary-dark);background:var(--tint-soft);
  border-radius:12px;padding:11px 14px}

.cta-box{background:var(--bg-light);border:1.5px solid var(--border-subtle);border-radius:20px;
  padding:30px 28px;margin:38px 0;text-align:center}
.cta-box p{font-size:16.5px;font-weight:700;color:#334155;line-height:1.6;max-width:520px;margin:0 auto 20px}
.cta-btn{display:inline-flex;align-items:center;justify-content:center;height:54px;min-width:230px;padding:0 30px;
  background:var(--primary);color:#fff;font-size:17px;font-weight:900;letter-spacing:.2px;border-radius:16px;
  box-shadow:0 5px var(--primary-shadow);transition:all .12s ease-in-out}
.cta-btn:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 7px var(--primary-shadow)}
.cta-btn:active{transform:translateY(3px);box-shadow:0 2px var(--primary-shadow)}

.faq{margin-top:44px;padding-top:34px;border-top:1px solid var(--border-subtle)}
.faq-h,.rel-h{font-size:clamp(22px,2.6vw,28px);font-weight:900;color:var(--text-dark);margin-bottom:20px;letter-spacing:-.01em}
.faq-item{margin-bottom:22px}
.faq-item h3{font-size:17px;font-weight:900;color:var(--text-dark);margin-bottom:7px}
.faq-item p{font-size:15.5px;color:var(--text-muted);line-height:1.7}

.related{margin-top:44px;padding-top:34px;border-top:1px solid var(--border-subtle)}
.related ul{list-style:none;display:grid;gap:9px}
.related li{font-size:16px;font-weight:700}
.related a{color:var(--primary)}
.related a:hover{text-decoration:underline}
.rel-n{font-size:13px;font-weight:700;color:var(--text-soft);margin-left:6px}
.rel-back{margin-top:18px;font-size:15px;font-weight:800}
.rel-back a{color:var(--primary)}

.cards{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:12px;margin-bottom:8px}
.cards a{display:flex;flex-direction:column;gap:5px;height:100%;background:#fff;border:2px solid var(--border-subtle);
  border-radius:16px;padding:18px 20px;box-shadow:0 4px var(--border-subtle);transition:all .15s ease}
.cards a:hover{border-color:#D0E2FF;box-shadow:0 5px #D0E2FF;transform:translateY(-2px)}
.card-name{font-size:16.5px;font-weight:800;color:var(--text-dark);line-height:1.3}
.card-n{font-size:13px;font-weight:700;color:var(--primary)}

.site-footer{background:var(--bg-light);border-top:1px solid var(--border-subtle);padding:54px 24px 40px}
.footer-cols{max-width:900px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:28px;padding-bottom:34px}
.footer-col{display:flex;flex-direction:column}
.footer-title{font-size:14px;font-weight:900;text-transform:uppercase;letter-spacing:.6px;color:#5774A2;margin-bottom:12px}
.footer-col a{font-size:14.5px;font-weight:700;color:#849BBD;margin-bottom:9px}
.footer-col a:hover{color:var(--primary)}
.footer-legal{max-width:900px;margin:0 auto;padding-top:26px;border-top:1px solid #E2E8F0;
  font-size:13.5px;font-weight:600;color:#849BBD;line-height:1.65;text-align:center}

@media (max-width:640px){
  .wrap{padding:14px 20px 56px}
  .bc{padding:14px 20px 0}
  .brand img{height:32px}
  .q h2{font-size:19px}
  .cta-box{padding:26px 20px}
  .cta-btn{width:100%}
}