:root{--bg:#fbfaf7;--ink:#1d1f24;--muted:#5b6070;--line:#e4e1d9;--accent:#0f6b5c}
@media (prefers-color-scheme:dark){:root{--bg:#14161a;--ink:#ecebe6;--muted:#a3a7b3;--line:#2b2f37;--accent:#4fc2a8}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 system-ui,-apple-system,"Segoe UI",sans-serif}
header,main,footer{max-width:760px;margin:0 auto;padding:0 20px}
header{display:flex;justify-content:space-between;align-items:center;padding-top:28px;padding-bottom:28px}
.marca{font-weight:800;font-size:22px;letter-spacing:-.02em;color:var(--ink);text-decoration:none}
nav a{color:var(--muted);text-decoration:none;margin-left:18px;font-size:15px}nav a:hover{color:var(--accent)}
h1{font-size:clamp(30px,6vw,46px);line-height:1.1;letter-spacing:-.03em;margin:24px 0 16px}
h2{font-size:21px;margin:36px 0 8px}p,li{color:var(--ink)}.sub{color:var(--muted);font-size:19px}
a{color:var(--accent)}ul{padding-left:20px}
.tarjetas{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;margin:32px 0}
.tarjeta{border:1px solid var(--line);border-radius:12px;padding:18px}.tarjeta b{display:block;margin-bottom:6px}
.tarjeta span{color:var(--muted);font-size:15px}
footer{border-top:1px solid var(--line);margin-top:56px;padding-top:20px;padding-bottom:40px;color:var(--muted);font-size:14px}