* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: sans-serif;
}

body {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: rgb(9, 74, 136);
}


.card {
    position: relative;
    width: 300px;
    height: 350px;
    margin: 20px;
}

.card .face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 10px;
    overflow: hidden;
    transition: .5s;
}

.card .front {
    transform: perspective(600px) rotateY(0deg);
    box-shadow: 0 5px 10px #000;
}

.card .front img {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.card .front h3 {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 45px;
    line-height: 45px;
    color: #fff;
    background: rgba(0,0,0,.4);
    text-align: center;
}

.card .back {
    transform: perspective(600px) rotateY(180deg);
    background: rgb(3, 35, 54);
    padding: 15px;
    color: #f3f3f3;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    text-align: center;
    box-shadow: 0 5px 10px #000;
}

.card .back .link {
    border-top: solid 1px #f3f3f3;
    height: 50px;
    line-height: 50px;
}

.card .back .link a {
    color: #f3f3f3;
}

.card .back h3 {
    font-size: 30px;
    margin-top: 20px;
    letter-spacing: 2px;
}

.card .back p {
    letter-spacing: 1px;
} 

.card:hover .front {
    transform: perspective(600px) rotateY(180deg);
}

.card:hover .back {
    transform: perspective(600px) rotateY(360deg);
}




/* === ESTILOS PARA LOS BOTONES DE DESCARGA === */
.download-btn {
    display: inline-block;
    padding: 12px 25px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 8px;
    text-decoration: none;
    color: white;
    transition: 0.3s ease-in-out;
    margin: 8px;
    box-shadow: 0px 4px 8px rgba(0,0,0,0.2);
}

/* Botón ROJO */
.download-btn.red {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
}
.download-btn.red:hover {
    background: linear-gradient(135deg, #ff6b6b, #e74c3c);
    transform: scale(1.05);
}

/* Botón VERDE */
.download-btn.green {
    background: linear-gradient(135deg, #27ae60, #1e8449);
}
.download-btn.green:hover {
    background: linear-gradient(135deg, #2ecc71, #27ae60);
    transform: scale(1.05);
}

/* Texto debajo de los botones */
.download-text {
    font-size: 14px;
    font-weight: bold;
    display: block;
    margin-top: 6px;
    color: #333;
}