body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background: linear-gradient(135deg, #2da8d8fb, #2142d6e5);
    color: #ffffff;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

header {
    text-align: center;
    padding: 2rem;
}

header h1 {
    font-size: 2.5rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 2rem auto;
    background: rgba(0, 0, 0, 0.2);
    padding: 1.5rem;
    border-radius: 10px;
}

.card-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    padding: 20px;
}

.card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 15px;
    padding: 20px;
    width: 250px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    backdrop-filter: blur(10px);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.card h3 {
    margin-top: 0;
}

/* Estilos de la ventana modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: linear-gradient(135deg, #ec4808, #15c1d8);
    margin: 15% auto;
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    width: 80%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 5px 15px rgba(255, 0, 0, 0.945);
    animation: fadeIn 0.5s;
}

@keyframes fadeIn {
    from {opacity: 0; transform: scale(0.9);}
    to {opacity: 1; transform: scale(1);}
}

.close-btn {
    color: #e00a0a;
    position: absolute;
    top: 10px;
    right: 25px;
    font-size: 35px;
    font-weight: bold;
    background: none;
    border: none;
    cursor: pointer;
}

.close-btn:hover {
    color: #d3d60d;
}