* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; font-family: Arial, Helvetica, sans-serif; background: #fff; }
a { color: inherit; }
.encabezado, .encabezado picture { display: block; width: 100%; }
.cintillo { display: block; width: 100%; height: auto; }
.promociones { display: flex; justify-content: center; align-items: flex-start; gap: 25px; max-width: 1100px; margin: 36px auto; padding: 0 18px; }
.promocion { display: block; width: min(100%, 342px); border-radius: 17px; overflow: hidden; flex: 0 1 342px; transition: transform .2s ease; }
.promocion:hover, .promocion:focus-visible { transform: translateY(-4px); }
.promocion:focus-visible { outline: 3px solid #1464be; outline-offset: 4px; }
.promocion img { display: block; width: 100%; height: auto; }
.error { text-align: center; padding: 60px 20px; }
@media (max-width: 620px) { .promociones { flex-direction: column; align-items: center; gap: 22px; margin: 24px auto; } .promocion { width: min(100%, 342px); flex: auto; } }