:root {
    --primary-color: #4a6fa5;
    --secondary-color: #6b8cbe;
    --accent-color: #e76f51;
    --text-color: #333;
    --background-color: #f5f7fa;
    --card-background: #fff;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme='dark'] {
    --primary-color: #6b8cbe;
    --secondary-color: #4a6fa5;
    --accent-color: #f4a261;
    --text-color: #e0e0e0;
    --background-color: #1a1a2e;
    --card-background: #212134;
    --border-color: #3a3a55;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 5px var(--shadow-color);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1, h2, h3 {
    margin-bottom: 1rem;
}

.controls button {
    background: transparent;
    border: none;
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
}

.controls button:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

nav {
    background-color: var(--card-background);
    border-bottom: 1px solid var(--border-color);
}

nav ul {
    display: flex;
    list-style: none;
    overflow-x: auto;
    padding: 0.5rem 0;
}

nav li {
    margin-right: 0.5rem;
    white-space: nowrap;
}

nav a {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--text-color);
    border-radius: 20px;
    transition: all 0.3s ease;
}

nav a:hover, nav a.active {
    background-color: var(--primary-color);
    color: white;
}

nav a i {
    margin-right: 0.5rem;
}

main {
    padding: 2rem 0;
    min-height: calc(100vh - 180px);
}

section {
    background-color: var(--card-background);
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 3px 10px var(--shadow-color);
}

.category-filter {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

select, button {
    padding: 0.5rem 1rem;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    background-color: var(--card-background);
    color: var(--text-color);
    cursor: pointer;
    font-size: 1rem;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

button i {
    margin-right: 0.5rem;
}

button:hover {
    background-color: var(--secondary-color);
}

#word-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}

.word-card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.word-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px var(--shadow-color);
}

.flashcard-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.flashcard {
    width: 100%;
    max-width: 500px;
    height: 300px;
    perspective: 1000px;
    margin-bottom: 2rem;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    box-shadow: 0 4px 8px var(--shadow-color);
    border-radius: 10px;
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
    border-radius: 10px;
}

.flashcard-back {
    transform: rotateY(180deg);
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    border-radius: 10px;
    background-color: var(--card-background);
}

.flashcard-back {
    transform: rotateY(180deg);
}

.word {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.pronunciation {
    color: var(--accent-color);
    font-style: italic;
    margin-bottom: 1rem;
}

.translation {
    font-size: 1.8rem;
    margin-bottom: 1rem;
}

.example {
    font-style: italic;
    color: #666;
    text-align: center;
}

.flashcard-controls {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.7rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
}

footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    .flashcard {
        height: 250px;
    }
    .word {
        font-size: 2rem;
    }
    .translation {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }
    .flashcard {
        height: 200px;
    }
    .word {
        font-size: 1.5rem;
    }
    .translation {
        font-size: 1.2rem;
    }
    .flashcard-controls {
        flex-direction: column;
        width: 100%;
    }
    .btn {
        width: 100%;
    }
}

/* 选择题测试模块优化 */
.quiz-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2.5rem;
    background: linear-gradient(145deg, var(--card-background), #f8f9fa);
    box-shadow: 0 5px 15px var(--shadow-color);
    border-radius: 12px;
}

.question {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background-color: var(--background-color);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

#quiz-word {
    color: var(--primary-color);
    background-color: rgba(74, 111, 165, 0.1);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    margin-bottom: 2rem;
}

.option {
    padding: 1rem 1rem 1rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background-color: var(--card-background);
    position: relative;
}

.option:hover {
    background-color: var(--background-color);
    border-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 6px 12px var(--shadow-color);
}

.option.selected {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: scale(1.02);
}

.option.correct {
    background-color: rgba(76, 175, 80, 0.2);
    border-color: #4CAF50;
    color: #2E7D32;
}

.option.incorrect {
    background-color: rgba(244, 67, 54, 0.2);
    border-color: #F44336;
    color: #C62828;
}

.option.correct::before {
    content: '✓';
    position: absolute;
    left: 0.8rem;
    color: #4CAF50;
    font-weight: bold;
}

.option.incorrect::before {
    content: '✗';
    position: absolute;
    left: 0.8rem;
    color: #F44336;
    font-weight: bold;
}

.quiz-feedback {
    margin: 1rem 0;
    padding: 1rem;
    border-radius: 8px;
    display: none;
    font-weight: bold;
    font-size: 1.1rem;
    border-left: 4px solid;
    transition: all 0.5s ease;
    opacity: 0;
    transform: translateY(10px);
}

.quiz-feedback.correct {
    background-color: rgba(76, 175, 80, 0.1);
    color: #2E7D32;
    display: block;
    border-color: #4CAF50;
    opacity: 1;
    transform: translateY(0);
}

.quiz-feedback.incorrect {
    background-color: rgba(244, 67, 54, 0.1);
    color: #C62828;
    display: block;
    border-color: #F44336;
    opacity: 1;
    transform: translateY(0);
}

.quiz-controls {
    display: flex;
    justify-content: space-between;
    margin-top: 1.5rem;
}

.quiz-stats {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    padding: 1rem;
    background-color: rgba(0,0,0,0.02);
    border-radius: 8px;
    font-size: 0.9rem;
}

.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 2rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(74, 111, 165, 0.3);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    padding: 1.5rem;
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
    
    .question {
        border-left: 4px solid var(--primary-color);
        font-size: 1.3rem;
    }

    .option {
        position: relative;
        padding-left: 2.5rem;
    }

    .option.correct::before {
        content: '✓';
        position: absolute;
        left: 0.8rem;
        color: #4CAF50;
        font-weight: bold;
    }

    .option.incorrect::before {
        content: '✗';
        position: absolute;
        left: 0.8rem;
        color: #F44336;
        font-weight: bold;
    }

    .quiz-feedback {
        font-size: 1.1rem;
        border-left: 4px solid;
    }

    .quiz-feedback.correct {
        border-color: #4CAF50;
    }

    .quiz-feedback.incorrect {
        border-color: #F44336;
    }

    .btn {
        font-size: 1rem;
        padding: 0.8rem 2rem;
    }

    @media (max-width: 768px) {
        .quiz-stats {
            flex-direction: column;
            gap: 0.5rem;
        }
        
        .quiz-stats p {
            text-align: center;
        }
    }
}
.quiz-feedback.correct {
    border-color: #4CAF50;
}

.quiz-feedback.incorrect {
    border-color: #F44336;
}

.quiz-feedback.correct,
.quiz-feedback.incorrect {
    opacity: 1;
    transform: translateY(0);
}

.btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    text-shadow: 0 1px 2px rgba(0,0,0,0.1);
    font-size: 1rem;
    padding: 0.8rem 2rem;
}

.btn:hover {
    box-shadow: 0 6px 15px rgba(74, 111, 165, 0.3);
}

.quiz-stats {
    background-color: rgba(0,0,0,0.02);
    border-radius: 8px;
    padding: 1rem;
}

/* 移除错误嵌套的样式 */

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz-container {
        padding: 1.5rem;
    }
    
    .question {
        font-size: 1.1rem;
    }
    
    .option {
        padding: 1rem 0.8rem 1rem 2.5rem;
    }
    
    .quiz-stats {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .quiz-stats p {
        text-align: center;
    }
}
.quiz-stats p {
    background-color: var(--background-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
}

#correct-rate {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    padding: 0.8rem 1.6rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

.btn:active {
    transform: translateY(0);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .quiz