:root {
    --primary-color: #0066cc;
    --secondary-color: #f2f2f2;
    --correct-color: #4caf50;
    --incorrect-color: #f44336;
    --text-color: #333;
    --light-text: #666;
    --border-color: #ddd;
    --hover-color: #e6f2ff;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Noto Sans TC', 'Microsoft JhengHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f9f9f9;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background-color: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
    padding: 30px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

header p {
    color: var(--light-text);
}

.question-card {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.question-card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.question-title {
    font-weight: bold;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.option-label {
    display: flex;
    align-items: center;
    padding: 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
}

.option-label:hover {
    background-color: var(--hover-color);
}

.option-label input {
    margin-right: 10px;
}

.button-container {
    text-align: center;
    margin-top: 30px;
}

#submit-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#submit-btn:hover {
    background-color: #0055aa;
}

.hidden {
    display: none;
}

.score-box {
    background-color: white;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
    text-align: center;
}

#score-display {
    font-size: 24px;
    font-weight: bold;
    margin: 15px 0;
    color: var(--primary-color);
}

#score-analysis {
    text-align: left;
    margin-top: 15px;
}

.feedback {
    margin-top: 15px;
    padding: 10px;
    border-radius: 4px;
}

.correct {
    background-color: rgba(76, 175, 80, 0.1);
    border-left: 4px solid var(--correct-color);
}

.incorrect {
    background-color: rgba(244, 67, 54, 0.1);
    border-left: 4px solid var(--incorrect-color);
}

.explanation {
    margin-top: 10px;
    padding: 10px;
    background-color: var(--secondary-color);
    border-radius: 4px;
}

.category-analysis {
    margin-top: 20px;
    padding: 15px;
    background-color: var(--secondary-color);
    border-radius: 4px;
}

.category-title {
    font-weight: bold;
    margin-bottom: 5px;
}

.category-bar-container {
    height: 20px;
    background-color: #e0e0e0;
    border-radius: 10px;
    margin-top: 5px;
}

.category-bar {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 10px;
    text-align: right;
    color: white;
    padding-right: 10px;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .question-card {
        padding: 15px;
    }

    #submit-btn {
        width: 100%;
    }
}