:root{--fondo:#E6F7FB;--sup:#fff;--tinta:#0C2E3B;--sub:#4E6B76;--azul:#0AA5D8;--pato:#FFC229}
@media (prefers-color-scheme:dark){:root{--fondo:#0B0F14;--sup:#151B22;--tinta:#F2F5F7;--sub:#9AAAB5;--azul:#2BB8E8}}
*{box-sizing:border-box}body{margin:0;background:var(--fondo);color:var(--tinta);font:17px/1.6 ui-rounded,-apple-system,"SF Pro Rounded",system-ui,sans-serif}
main{max-width:720px;margin:0 auto;padding:32px 20px 64px}
header{display:flex;align-items:center;gap:12px;margin-bottom:24px}header img{width:56px;height:56px}header a{color:inherit;text-decoration:none;font-weight:800;font-size:22px}
h1{font-size:32px;line-height:1.2;margin:8px 0 4px}h2{font-size:21px;margin:32px 0 8px}
.tarjeta{background:var(--sup);border:2.5px solid var(--tinta);border-radius:20px;box-shadow:4px 4px 0 var(--tinta);padding:20px 22px;margin:20px 0}
@media (prefers-color-scheme:dark){.tarjeta{border-width:1px;box-shadow:none}}
.sub{color:var(--sub)}a{color:var(--azul)}ul{padding-left:22px}
.boton{display:inline-block;background:var(--pato);color:#0C2E3B;font-weight:800;padding:12px 18px;border:2.5px solid #0C2E3B;border-radius:16px;text-decoration:none;box-shadow:3px 3px 0 #0C2E3B}
footer{margin-top:48px;font-size:14px;color:var(--sub)}