body {
    font-family: Arial, sans-serif;
    background: #f5f7fa;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 700px;
    margin: auto;
    background: #fff;
    padding: 20px;
    border-radius: 10px;
}

.home-btn {
    background: #2563eb;
    color: white;
    padding: 8px 14px;
    border-radius: 6px;
    text-decoration: none;
    display: inline-block;
    margin-bottom: 15px;
}

.question {
    margin-bottom: 25px;
}

.question h3 {
    margin-bottom: 10px;
}

.option {
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 6px;
    margin-bottom: 8px;
    cursor: pointer;
}

.option:hover {
    background: #f1f5f9;
}

.option.correct {
    background: #dcfce7;
    border-color: #22c55e;
}

.option.wrong {
    background: #fee2e2;
    border-color: #ef4444;
}

.option.disabled {
    pointer-events: none;
    opacity: 0.8;
}

#scoreBox {
    font-size: 18px;
    font-weight: bold;
    margin-top: 20px;
    text-align: center;
    display: none;
}

.explanation {
    display: none;
    margin-top: 10px;
    padding: 10px;
    background: #f8fafc;
    border-left: 4px solid #2563eb;
    border-radius: 6px;
    font-size: 14px;
}

.image-option {
    padding: 10px;
    cursor: pointer;
    border: 2px solid transparent;
    border-radius: 8px;
    margin-bottom: 10px;
    text-align: center;
}

.image-option img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
}

.image-option:hover {
    border-color: #ccc;
}

.image-option.selected {
    border-color: #007bff;
    background-color: #f0f6ff;
}

.image-option.correct {
    border-color: #28a745;
}

.image-option.wrong {
    border-color: #dc3545;
}