body { font-family: system-ui, sans-serif; max-width: 720px; margin: 0 auto; padding: 1rem; }
header { border-bottom: 1px solid #ccc; padding-bottom: .5rem; margin-bottom: 1rem; }
label { display: block; margin: .6rem 0; }
button, .boton { padding: .5rem 1rem; cursor: pointer; }
.error { color: #b00020; }
.resultado { border: 1px solid #ddd; padding: 1rem; margin-top: 1rem; }
table { border-collapse: collapse; width: 100%; }
td, th { border: 1px solid #ddd; padding: .35rem .5rem; text-align: left; }