body {
    background-image: url('imagenes/kimetsu_inicio.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-color: #667eea;
    min-height: 100vh;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: -1;
}

img {
    width: 150px;
    height: auto;
    border-radius: 10px;
}

.contenedor-centrado {
    min-height: 100vh;
    padding: 20px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.titulo-principal {
    font-size: 48px;
    font-weight: bold;
    color: white;
    text-shadow: 3px 3px 10px rgba(0, 0, 0, 0.8);
    margin-bottom: 15px;
    margin-top: 50px;
}

.subtitulo-principal {
    font-size: 20px;
    color: white;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.8);
    margin-bottom: 50px;
}

.row {
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.tarjeta-opcion {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0px 8px 20px rgba(0, 0, 0, 0.5);
    padding: 30px;
    margin-bottom: 20px;
}

.tarjeta-opcion:hover {
    box-shadow: 0px 12px 30px rgba(0, 0, 0, 0.6);
}

.icono-version {
    font-size: 64px;
    color: #667eea;
    margin-bottom: 20px;
}

.titulo-version {
    font-size: 24px;
    font-weight: bold;
    color: #333333;
    margin-bottom: 15px;
}

.descripcion-version {
    font-size: 16px;
    color: #666666;
    margin-bottom: 20px;
    line-height: 1.5;
}

.lista-tecnologias {
    list-style-type: none;
    padding-left: 0;
    text-align: left;
    margin-bottom: 25px;
}

.lista-tecnologias li {
    padding-top: 10px;
    padding-bottom: 10px;
    color: #555555;
    border-bottom: 1px solid #eeeeee;
    font-size: 15px;
}

.lista-tecnologias li:first-child {
    border-top: 1px solid #eeeeee;
}

.boton-jugar {
    padding-top: 12px;
    padding-bottom: 12px;
    padding-left: 30px;
    padding-right: 30px;
    font-size: 18px;
    font-weight: bold;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    width: 100%;
}

.btn-success {
    background-color: #198754;
}

.btn-success:hover {
    background-color: #157347;
}

.info-card {
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 8px;
    box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.3);
    padding: 15px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    margin-top: 40px;
}

.info-card p {
    margin-bottom: 0;
    color: #666666;
}

.footer-texto {
    color: white;
    text-shadow: 2px 2px 6px rgba(0, 0, 0, 0.8);
    margin-top: 30px;
}

@media screen and (max-width: 768px) {
    .titulo-principal {
        font-size: 36px;
        margin-top: 20px;
    }

    .subtitulo-principal {
        font-size: 18px;
        margin-bottom: 30px;
    }

    .icono-version {
        font-size: 48px;
    }

    .tarjeta-opcion {
        padding: 20px;
    }
}

@media screen and (max-width: 576px) {
    .titulo-principal {
        font-size: 28px;
    }

    .subtitulo-principal {
        font-size: 16px;
    }

    .icono-version {
        font-size: 40px;
    }

    .titulo-version {
        font-size: 20px;
    }

    .boton-jugar {
        font-size: 16px;
        padding: 10px 20px;
    }
}