body {
    margin: 0;
    padding: 0;
    background-color: #f5f7fa;
    font-family: 'Segoe UI', Roboto, Arial, sans-serif;
    }

    .banner-container {
    max-width: 1000px;
    margin: 30px auto 10px auto;
    padding: 0 15px;
    }

    .card {
    max-width: 970px;
    margin: 0 auto 40px auto;
    border: none;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    }

    .card-header {
    background: linear-gradient(90deg, #1E1D3E, #2F2D60);
    padding: 25px 10px;
    border-bottom: 4px solid #ffc107;
    }

    .card-header h4 {
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin: 0;
    }

    .card-body {
    padding: 40px 40px 30px 40px;
    background-color: #fff;
    border-radius: 0 0 16px 16px;
    }

    label.form-label {
    font-weight: 600;
    color: #333;
    }

    input.form-control, select.form-select {
    border-radius: 8px;
    padding: 10px 12px;
    border: 1px solid #ccc;
    transition: all 0.2s ease-in-out;
    }

    input.form-control:focus, select.form-select:focus {
    border-color: #1E1D3E;
    box-shadow: 0 0 0 0.15rem rgba(30,29,62,0.25);
    }

    .btn-success {
    background-color: #198754;
    border: none;
    border-radius: 10px;
    padding: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    transition: all 0.25s ease-in-out;
    }

    .btn-success:hover {
    background-color: #157347;
    transform: scale(1.02);
    }

    .alert {
    border-radius: 10px;
    font-size: 0.95rem;
    }

    ol li {
    margin-bottom: 10px;
    }

    #aceptoReglamento {
    transform: scale(1.3);
    margin-right: 8px;
    }

    @media (max-width: 768px) {
    .card-body {
        padding: 25px 20px;
    }

    .card-header h4 {
        font-size: 1.1rem;
    }
    }

    /* --- Checkbox reglamento visible y centrado --- */
    .form-check {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    background: #f8f9fa;
    border: 2px solid #dee2e6;
    border-radius: 10px;
    padding: 15px;
    margin-top: 10px;
    transition: all 0.3s ease;
    }

    .form-check:hover {
    background-color: #eef7f1;
    border-color: #198754;
    }

    /* Estilo visual del checkbox */
    #aceptoReglamento {
    appearance: none;              /* Quita el estilo del sistema */
    -webkit-appearance: none;
    width: 26px;
    height: 26px;
    border: 2px solid #198754;
    border-radius: 6px;
    background-color: #fff;
    cursor: pointer;
    position: relative;
    flex-shrink: 0;
    transition: all 0.2s ease-in-out;
    }

    #aceptoReglamento:checked {
    background-color: #198754;
    border-color: #198754;
    }

    /* Ícono de check */
    #aceptoReglamento:checked::after {
    content: "✓";
    position: absolute;
    color: #fff;
    font-size: 18px;
    font-weight: bold;
    top: 0;
    left: 6px;
    }

    /* Texto del label */
    .form-check-label {
    font-size: 1rem;
    color: #212529;
    line-height: 1.5;
    margin-top: 2px;
    }

    .form-check-label b u {
    color: #1E1D3E;
    text-decoration-color: #ffc107;
    text-underline-offset: 4px;
    }

    /* --- ¿Cómo te enteraste? : tarjetas de selección --- */
    .entero {
    border: 0;
    padding: 22px 22px 18px 22px;
    margin: 0;
    min-width: 0;
    border-radius: 14px;
    background: linear-gradient(135deg, #f7f7fc 0%, #fff8ec 100%);
    border-left: 5px solid #F39519;
    }

    .entero-titulo {
    float: left;                   /* evita que el legend se monte sobre el borde */
    width: 100%;
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    letter-spacing: 0.3px;
    color: #1E1D3E;
    }

    .entero-ayuda {
    clear: both;
    margin: 2px 0 14px 0;
    font-size: 0.9rem;
    color: #6c6b80;
    }

    .entero-opciones {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 12px;
    }

    .entero-opcion {
    position: relative;
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
    padding: 14px 44px 14px 14px;
    background: #fff;
    border: 2px solid #dfe1ea;
    border-radius: 12px;
    cursor: pointer;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
    }

    .entero-opcion:hover {
    border-color: #F39519;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(30, 29, 62, 0.10);
    }

    /* El radio sigue existiendo para teclado y lectores de pantalla. */
    .entero-opcion input {
    position: absolute;
    opacity: 0;
    width: 1px;
    height: 1px;
    }

    .entero-opcion:focus-within {
    outline: 3px solid rgba(243, 149, 25, 0.45);
    outline-offset: 2px;
    }

    .entero-icono {
    flex-shrink: 0;
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 10px;
    background: #f1f1f8;
    font-size: 1.3rem;
    transition: background-color 0.2s ease;
    }

    .entero-texto {
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.3;
    color: #333;
    }

    .entero-check {
    position: absolute;
    top: 50%;
    right: 12px;
    display: grid;
    place-items: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #F39519;
    color: #fff;
    font-size: 0.85rem;
    font-weight: 700;
    opacity: 0;
    transform: translateY(-50%) scale(0.4);
    transition: opacity 0.2s ease, transform 0.2s ease;
    }

    .entero-opcion.seleccionada {
    border-color: #1E1D3E;
    background: #fffaf1;
    box-shadow: 0 6px 18px rgba(30, 29, 62, 0.14);
    }

    .entero-opcion.seleccionada .entero-icono {
    background: #ffe3b8;
    }

    .entero-opcion.seleccionada .entero-texto {
    color: #1E1D3E;
    }

    .entero-opcion.seleccionada .entero-check {
    opacity: 1;
    transform: translateY(-50%) scale(1);
    }

    .entero-otro {
    margin-top: 14px;
    animation: entero-aparece 0.25s ease;
    }

    .entero-otro[hidden] {
    display: none;
    }

    .entero-otro input {
    text-transform: uppercase;
    }

    .entero-otro input::placeholder {
    text-transform: none;
    }

    @keyframes entero-aparece {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
    }

    @media (prefers-reduced-motion: reduce) {
    .entero-opcion, .entero-check, .entero-icono { transition: none; }
    .entero-opcion:hover { transform: none; }
    .entero-otro { animation: none; }
    }