:root {
  --fondo: #f6f4ef;
  --texto: #1f2a44;
  --suave: #55607a;
  --naranja: #f28c28;
  --tarjeta: #ffffff;
  --linea: #e3dfd5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fondo: #141b2d;
    --texto: #eef0f5;
    --suave: #a7b0c4;
    --tarjeta: #1f2a44;
    --linea: #2e3a57;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--fondo);
  color: var(--texto);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; }
header img { width: 52px; height: 52px; }
header a { color: inherit; text-decoration: none; font-weight: 700; font-size: 1.4rem; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
p, li { color: var(--texto); }
.sub { color: var(--suave); font-size: 1.1rem; margin-top: 0; }
.tarjetas { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin: 28px 0; }
.tarjeta { background: var(--tarjeta); border: 1px solid var(--linea); border-radius: 14px; padding: 16px; }
.tarjeta b { display: block; margin-bottom: 4px; }
.tarjeta span { color: var(--suave); font-size: 0.95rem; }
a { color: var(--naranja); }
.boton { display: inline-block; background: var(--naranja); color: #1f2a44; font-weight: 700; padding: 12px 20px; border-radius: 10px; text-decoration: none; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--linea); color: var(--suave); font-size: 0.9rem; }