body {
    font-family: "Times New Roman", Times, serif;
    background-color: #f5f5f5;
    display: flex;
    flex-direction: column;
}

/* Header styles */
.header {
    text-align: center;
    margin: 30px 10px 20px 10px;
}

.header h1 {
    font-size: 2rem;
    color: #2e7d32;
}

.header p {
    margin-top: 10px;
    color: #555;
    font-size: 1rem;
}

/* Materials Cards Container */
.materials-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    padding: 20px;
}

/* Single Material Card */
.material-card {
    background-color: #ffffff;
    padding: 20px;
    width: 280px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: transform 0.3s ease, background-color 0.3s ease;
    text-align: center;
}

/* Hover for Desktop */
.material-card:hover {
    transform: translateY(-8px);
    background-color: #e8f5e9;
}

/* Active State for Mobile (Touch Highlight) */
.material-card:active {
    background-color: #d0f0d5; /* slightly darker green */
    transform: scale(0.97);
}

.material-card h2 {
    color: #2e7d32;
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.material-card p {
    color: #666;
    font-size: 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .materials-container {
        flex-direction: column;
        align-items: center;
    }

    .material-card {
        width: 90%;
    }
}