.bienvenida {
    background-image: url('../img/fondo.png'); 
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    background-attachment: fixed;

    min-height: 500px;
    width: 100%;
    
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center; 
    text-align: center;
    padding: 20px;
    z-index: 0; /* el fondo queda detrás de los modales */

    position: relative; 
    color: #fff; 
    background-color: transparent !important;
}

.bienvenida::before {
    content: "";
    position: absolute;
    z-index: 0 !important;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.45); 
}

.bienvenida .titulo, 
.bienvenida .subtitulo, 
.bienvenida .btn-ver-mas {
    position: relative;
    z-index: 2; 
    text-shadow: 1px 1px 3px rgba(0,0,0,0.8);
}

.bienvenida .titulo {
    font-size: 3.5em; 
    margin-bottom: 10px;
    font-weight: bold;
}

.bienvenida .subtitulo {
    font-size: 1.5em;
    margin-bottom: 40px;
    max-width: 800px;
}

.btn-ver-mas {
    background-color: transparent; 
    border: 2px solid white; 
    color: white;
    padding: 12px 35px;
    text-decoration: none;
    border-radius: 30px; 
    font-size: 1.1em;
    transition: all 0.3s ease;
}

.btn-ver-mas:hover {
    background-color: rgba(255, 255, 255, 0.9); 
    color: #922b2b;
}

@media (max-width: 768px) {
    .bienvenida {
        min-height: 400px;
        background-attachment: scroll;
    }
    .bienvenida .titulo {
        font-size: 2.2em;
    }
    .bienvenida .subtitulo {
        font-size: 1.1em;
    }
    .btn-ver-mas {
        padding: 10px 30px;
    }
}