.quiz-container {
    max-width: 800px;
    margin: 50px auto;
    background: var(--card-bg);
    padding: 50px;
    border-radius: 25px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.1);
    border-top: 10px solid var(--navbar-color);
}

.ascii-logo {
    background: var(--navbar-color, #1468a2); /* Uses your blue theme */
    color: white; /* Clean white text */
    padding: 30px;
    border-radius: 15px;
    font-family: 'Courier New', monospace;
    font-size: 10px;
    line-height: 1.2;
    text-align: center;
    margin-bottom: 25px;
    white-space: pre;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    border: 2px solid rgba(255,255,255,0.2);
}

.category-group {
    margin-bottom: 40px;
    border-left: 4px solid var(--navbar-color);
    padding-left: 20px;
}

.category-group h3 {
    font-size: 1.8rem;
    color: var(--navbar-color);
    margin-bottom: 5px;
}

.category-desc {
    color: #636e72;
    font-style: italic;
    margin-bottom: 15px;
}

/* INTERACTIVE LABELS */
label {
    display: flex;
    align-items: center;
    background: #f8f9fa;
    padding: 18px;
    margin-bottom: 12px;
    border-radius: 12px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: 0.3s;
}

label:hover {
    background: #eef6fc;
    border-color: var(--navbar-color);
}

/* THE MAGIC: Changes color when clicked */
label:has(input:checked) {
    background: var(--navbar-color);
    color: white !important;
    font-weight: bold;
    transform: scale(1.02);
}

input[type="checkbox"] {
    width: 22px;
    height: 22px;
    margin-right: 15px;
}

.submit-btn {
    background: linear-gradient(to right, var(--navbar-color), #0984e3);
    color: white;
    width: 100%;
    padding: 20px;
    border: none;
    border-radius: 15px;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(20, 104, 162, 0.3);
}