:root{
  --bg:#ffffff;--bg-alt:#f4f6fa;--surface:#ffffff;--text:#14213d;--muted:#55607a;--line:#e2e6ee;
  --brand:#0f2a5c;--accent:#f5b301;--accent-ink:#1a1400;--shadow:0 10px 30px rgba(15,42,92,.08);
}
@media (prefers-color-scheme: dark){
  :root{--bg:#0c1424;--bg-alt:#111c31;--surface:#15223b;--text:#e8edf7;--muted:#a3aec4;--line:#243352;--brand:#9db8ef;--shadow:0 10px 30px rgba(0,0,0,.35);}
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;font-size:18px}
a{color:inherit}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px;margin:0 auto;padding:0 20px}
header{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{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;text-decoration:none;font-size:1.1rem}
.logo-mark{width:34px;height:34px;border-radius:9px;background:var(--accent);display:grid;place-items:center}
.menu{display:flex;gap:26px;align-items:center}
.menu a{text-decoration:none;color:var(--muted);font-weight:500;font-size:.95rem}
.menu a:hover,.menu a.activo{color:var(--text)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:10px;font-weight:700;text-decoration:none;font-size:1rem;border:2px solid transparent}
.btn-accent{background:var(--accent);color:var(--accent-ink)!important}
.btn-ghost{border-color:var(--line);background:var(--surface)}
.menu .btn{padding:9px 16px}
@media (max-width:820px){.menu a:not(.btn){display:none}}

/* listado */
.cabecera{padding:64px 0 40px;background:var(--bg-alt);border-bottom:1px solid var(--line)}
.tag{display:inline-block;font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--brand);margin-bottom:10px}
.cabecera h1{font-size:clamp(1.9rem,4.5vw,2.8rem);line-height:1.15;letter-spacing:-.02em;margin-bottom:12px}
.cabecera p{color:var(--muted);max-width:640px}
.lista{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;padding:48px 0 72px}
@media (max-width:720px){.lista{grid-template-columns:1fr}}
.tarjeta{display:block;text-decoration:none;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:26px;transition:border-color .15s}
.tarjeta:hover{border-color:var(--brand)}
.tarjeta h2{font-size:1.2rem;line-height:1.3;margin:6px 0 10px}
.tarjeta p{color:var(--muted);font-size:.97rem}
.meta{font-size:.85rem;color:var(--muted)}

/* artículo */
.migas{font-size:.88rem;color:var(--muted);padding-top:28px}
.migas a{color:var(--muted)}
article .cab{padding:18px 0 28px;border-bottom:1px solid var(--line);margin-bottom:32px}
article h1{font-size:clamp(1.8rem,4.5vw,2.6rem);line-height:1.15;letter-spacing:-.02em;margin:8px 0 14px}
.autor{display:flex;gap:12px;align-items:center;font-size:.92rem;color:var(--muted)}
.autor .ini{width:40px;height:40px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-weight:800;flex:none}
.autor b{color:var(--text)}
.cuerpo h2{font-size:1.45rem;line-height:1.25;margin:38px 0 12px;letter-spacing:-.01em}
.cuerpo h3{font-size:1.15rem;margin:26px 0 8px}
.cuerpo p{margin-bottom:16px}
.cuerpo ul{margin:0 0 18px 22px;display:grid;gap:6px}
.cuerpo a{color:var(--brand);text-underline-offset:3px}
.nota{background:var(--bg-alt);border-left:4px solid var(--accent);border-radius:10px;padding:18px 22px;margin:28px 0}
.nota p{margin:0}
.aviso{font-size:.85rem;color:var(--muted);margin-top:30px;padding-top:18px;border-top:1px solid var(--line)}
.cta{margin:44px 0;background:var(--brand);color:#fff;border-radius:16px;padding:32px}
@media (prefers-color-scheme: dark){.cta{background:#15223b;border:1px solid var(--line)}}
.cta h2{font-size:1.4rem;margin-bottom:8px;color:#fff}
.cta p{opacity:.9;margin-bottom:20px}
.cta .botones{display:flex;flex-wrap:wrap;gap:12px}
.cta .btn-ghost{background:transparent;border-color:rgba(255,255,255,.5);color:#fff}
.relacionados{padding:10px 0 70px}
.relacionados h2{font-size:1.2rem;margin-bottom:16px}
.relacionados .lista{padding:0}

footer{border-top:1px solid var(--line);padding:30px 0;color:var(--muted);font-size:.9rem}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
footer a{color:var(--muted)}
.wa{position:fixed;right:18px;bottom:18px;width:58px;height:58px;border-radius:50%;background:#25d366;display:grid;place-items:center;box-shadow:0 8px 24px rgba(0,0,0,.25);z-index:60}
.logo{white-space:nowrap}
.tarjeta h3{font-size:1.1rem;line-height:1.3;margin:6px 0 10px}
@media (max-width:480px){.menu .btn{padding:8px 12px;font-size:.85rem}.logo{font-size:1rem}}
.seccion{font-size:1.4rem;margin:44px 0 6px;letter-spacing:-.01em}
.rapidas .faq{max-width:820px}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{cursor:pointer;font-weight:600;font-size:1.05rem;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.4rem;line-height:1;color:var(--brand)}
.faq details[open] summary::after{content:"–"}
.faq details p{color:var(--muted);margin-top:10px}
.lista{padding-top:16px}

.tabs{display:none}
@media (max-width:820px){.tabs{display:flex;justify-content:space-around;border-top:1px solid var(--line);overflow-x:auto}.tabs a{flex:1;text-align:center;padding:11px 6px;font-size:.88rem;font-weight:600;color:var(--muted);text-decoration:none;white-space:nowrap;border-bottom:2px solid transparent}.tabs a.activo{color:var(--text);border-bottom-color:var(--accent)}}