body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #4b79a1, #283e51);
    color: white;
}
header {
    text-align: center;
    padding: 40px 20px;
}
h1 {
    margin: 0;
    font-weight: 300;
    font-size: 2.5rem;
}
.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    padding: 30px;
    max-width: 1200px;
    margin: auto;
}
.module-btn {
    background: rgba(255,255,255,0.15);
    padding: 20px;
    text-align: center;
    border-radius: 12px;
    font-size: 1.1rem;
    cursor: pointer;
    backdrop-filter: blur(8px);
    transition: 0.25s ease;
    border: 1px solid rgba(255,255,255,0.25);
    text-decoration: none;
    color: white;
}
.module-btn:hover {
    background: rgba(255,255,255,0.30);
    transform: translateY(-4px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.2);
}
footer {
    text-align: center;
    padding: 15px;
    font-size: 0.9rem;
    opacity: 0.8;
}
h2{
    text-align: center;
}