body {
    font-family: 'Georgia', serif;
    background-color: #1a1a1a;
    color: #e0e0e0;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: #0d0d0d;
    padding: 1rem;
    text-align: center;
    border-bottom: 2px solid #444;
}

h1 {
    margin: 0;
    font-size: 2.5rem;
    color: #c5b358; /* Gold foil color */
    text-shadow: 2px 2px 4px #000;
}

main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
}

#visualization-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
    width: 100%;
    max-width: 800px;
}

.metal {
    width: 100px;
    height: 100px;
    border: 2px solid #888;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: #333;
    box-shadow: 0 0 10px #000;
}

.metal:hover {
    transform: scale(1.1);
    border-color: #c5b358;
    box-shadow: 0 0 20px #c5b358;
}

.metal.paired {
    border-color: #87ceeb;
    box-shadow: 0 0 25px #87ceeb;
    transform: scale(1.1);
}

#info-box {
    background-color: #2a2a2a;
    padding: 2rem;
    border: 1px solid #444;
    border-radius: 8px;
    width: 100%;
    max-width: 800px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
}

#info-box h2 {
    margin-top: 0;
    color: #c5b358;
}

footer {
    background-color: #0d0d0d;
    padding: 1rem;
    text-align: center;
    border-top: 2px solid #444;
}

footer a {
    color: #c5b358;
    text-decoration: none;
    font-size: 1.1rem;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    #visualization-container {
        grid-template-columns: repeat(2, 1fr);
    }

    .metal {
        width: 80px;
        height: 80px;
        font-size: 1rem;
    }

    h1 {
        font-size: 2rem;
    }
}