body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(-45deg, #c05030, #b02060, #1070a0, #10a080);
    background-size: 400% 400%;
    animation: gradientBackground 15s ease infinite;
    color: #fff;
    overflow-x: hidden;
}

@keyframes gradientBackground {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

header {
    width: 100%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 20px 0;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    margin-bottom: 40px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

h1 {
    margin: 0;
    font-size: 2.8rem;
    color: #fff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

main {
    width: 100%;
    max-width: 1200px;
    padding: 0 20px;
    box-sizing: border-box;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 30px;
    text-align: center;
    transition: transform 0.3s ease-in-out, box-shadow 0.3s ease-in-out;
    position: relative;
    overflow: hidden;
    /* Subtle inner shadow for depth */
    box-shadow: inset 0 0 10px rgba(255, 255, 255, 0.1), 0 8px 32px 0 rgba(31, 38, 135, 0.37);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0) 100%);
    pointer-events: none;
}

.card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 12px 40px 0 rgba(31, 38, 135, 0.5);
}

.card h2 {
    font-size: 1.8rem;
    color: #fff;
    margin-top: 15px;
    margin-bottom: 10px;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
}

.card p {
    color: #e0e0e0;
    line-height: 1.6;
    margin-bottom: 25px;
}

.card i {
    font-size: 3.5rem;
    color: #8aff8a; /* A vibrant green for icons */
    margin-bottom: 15px;
    text-shadow: 0 0 10px rgba(138, 255, 138, 0.6);
}

.button {
    display: inline-block;
    background: linear-gradient(45deg, #00bcd4 0%, #00e676 100%); /* Vibrant gradient button */
    color: #ffffff;
    padding: 14px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 230, 118, 0.4);
    border: none;
}

.button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 230, 118, 0.6);
    background: linear-gradient(45deg, #00e676 0%, #00bcd4 100%);
}

.placeholder .button {
    background: linear-gradient(45deg, #6c757d 0%, #495057 100%);
    cursor: not-allowed;
    box-shadow: none;
}

.placeholder .button:hover {
    transform: none;
    box-shadow: none;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    h1 {
        font-size: 2.2rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }
}