/* Common styles shared between all class pages */
body {
    font-family: 'Courier New', monospace;
    background: linear-gradient(45deg, #0a0a0a, #1a1a1a);
    margin: 0;
    padding: 20px;
    color: #d4d4d4;
    min-height: 100vh;
}

.header {
    background: linear-gradient(180deg, #000000, #1a1a1a);
    padding: 30px 20px;
    text-align: center;
    border: 2px solid #333;
    margin-bottom: 30px;
    position: relative;
    background-image: 
        linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
        url('../../texture.png');
    background-repeat: repeat;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}

.back-button {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent-red);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    z-index: 10; /* Add this */
    padding: 10px; /* Add this */
    cursor: pointer; /* Add this */
}

.header {
    /* ... existing styles ... */
    z-index: 1; /* Add this */
}