/* 语音模块样式 */

/* 页面标题 */
.page-header {
    background: var(--gradient-primary);
    color: white;
    padding: 120px 0;
    text-align: center;
    margin-bottom: 60px;
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,%3Csvg width="100" height="100" viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"%3E%3Cpath d="M11 18c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm48 25c3.866 0 7-3.134 7-7s-3.134-7-7-7-7 3.134-7 7 3.134 7 7 7zm-43-7c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zm63 31c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM34 90c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 3 3 3 3zm56-76c1.657 0 3-1.343 3-3s-1.343-3-3-3-3 1.343-3 3 1.343 3 3 3zM12 86c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm28-65c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm23-11c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-6 60c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm29 22c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zM32 63c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm57-13c2.76 0 5-2.24 5-5s-2.24-5-5-5-5 2.24-5 5 2.24 5 5 5zm-9-21c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM60 91c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM35 41c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2zM12 60c1.105 0 2-.895 2-2s-.895-2-2-2-2 .895-2 2 .895 2 2 2z" fill="%23ffffff" fill-opacity="0.1" fill-rule="evenodd"/%3E%3C/svg%3E');
    opacity: 0.3;
    animation: moveBackground 20s linear infinite;
}

@keyframes moveBackground {
    0% {
        transform: translateY(0);
    }
    100% {
        transform: translateY(-100px);
    }
}

/* 页面标题装饰元素 */
.page-header::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
}

.page-header h2 {
    font-size: 3.2rem;
    margin-bottom: 20px;
    color: white;
    font-weight: 800;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 1.2s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    letter-spacing: -0.02em;
    line-height: 1.2;
    position: relative;
    z-index: 1;
}

.page-header p {
    font-size: 1.3rem;
    color: rgba(255, 255, 255, 0.95);
    max-width: 800px;
    margin: 0 auto;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 1.2s cubic-bezier(0.175, 0.885, 0.32, 1.275) 0.2s both;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

/* 语音模块导航 */
.voice-nav {
    background-color: var(--bg-light);
    padding: 30px 0;
    margin-bottom: 60px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.voice-nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.voice-tabs {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    position: relative;
    z-index: 1;
}

.voice-tab {
    padding: 14px 28px;
    border: 2px solid transparent;
    border-radius: 50px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.voice-tab::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left 0.4s ease;
    z-index: -1;
    border-radius: 50px;
}

.voice-tab:hover::before {
    left: 0;
}

.voice-tab:hover {
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.voice-tab.active {
    background: var(--gradient-primary);
    color: white;
    border-color: var(--primary-color);
    box-shadow: var(--shadow-hover);
}

.voice-tab.active::before {
    left: 0;
}

/* 语音内容区域 */
.voice-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.voice-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 发音规则 */
.rule-section {
    margin-bottom: 60px;
    position: relative;
}

.rule-section h4 {
    font-size: 1.6rem;
    margin-bottom: 30px;
    color: var(--text-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 12px;
    position: relative;
    display: inline-block;
}

.rule-section h4::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.rule-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.rule-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 32px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(248, 250, 252, 0.8));
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .rule-card {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.8));
}

.rule-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.rule-card:hover::before {
    transform: scaleX(1);
}

.rule-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

[data-theme="dark"] .rule-card:hover {
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.rule-card h5 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--text-color);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
}

.rule-card h5::before {
    content: '✓';
    color: var(--primary-color);
    font-weight: bold;
}

.rule-card:hover h5 {
    color: var(--primary-color);
    transform: translateY(-2px);
}

.rule-card ul {
    list-style: none;
    padding: 0;
}

.rule-card ul li {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-light);
    transition: var(--transition);
    position: relative;
    padding-left: 20px;
}

.rule-card ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.rule-card ul li:hover {
    color: var(--primary-color);
    padding-left: 25px;
    background-color: rgba(124, 58, 237, 0.05);
    margin-left: -10px;
    margin-right: -10px;
    padding-left: 30px;
    border-radius: 5px;
}

/* 规则卡片动画 */
.rule-card {
    animation: fadeInUp 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    opacity: 0;
}

.rule-card:nth-child(1) {
    animation-delay: 0.1s;
}

.rule-card:nth-child(2) {
    animation-delay: 0.2s;
}

/* 音标学习 */
.phonetics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 45px;
    margin-bottom: 60px;
}

.phonetic-category {
    background-color: var(--bg-light);
    border-radius: 15px;
    padding: 30px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.phonetic-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.phonetic-category h4 {
    font-size: 1.6rem;
    margin-bottom: 30px;
    color: var(--text-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 12px;
    position: relative;
    display: inline-block;
}

.phonetic-category h4::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.phonetic-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
}

.phonetic-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 28px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(248, 250, 252, 0.8));
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .phonetic-card {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.8));
}

.phonetic-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.phonetic-card:hover::before {
    transform: scaleX(1);
}

.phonetic-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

[data-theme="dark"] .phonetic-card:hover {
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.phonetic-symbol {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 20px;
    transition: var(--transition);
    display: inline-block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.phonetic-card:hover .phonetic-symbol {
    transform: scale(1.1) rotate(5deg);
}

.phonetic-examples p {
    margin-bottom: 20px;
    color: var(--text-light);
    transition: var(--transition);
    font-weight: 500;
}

.phonetic-card:hover .phonetic-examples p {
    color: var(--text-color);
    transform: translateY(-2px);
}

.play-audio {
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50px;
    padding: 12px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 auto;
    box-shadow: 0 6px 25px rgba(124, 58, 237, 0.4);
    position: relative;
    overflow: hidden;
}

.play-audio::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.6s ease;
}

.play-audio:hover::before {
    left: 100%;
}

.play-audio:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 30px rgba(124, 58, 237, 0.6);
}

.play-audio i {
    transition: var(--transition);
}

.play-audio:hover i {
    transform: rotate(360deg);
}

/* 音标卡片动画 */
.phonetic-card {
    animation: fadeInUp 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    opacity: 0;
}

.phonetic-card:nth-child(1) {
    animation-delay: 0.1s;
}

.phonetic-card:nth-child(2) {
    animation-delay: 0.2s;
}

.phonetic-card:nth-child(3) {
    animation-delay: 0.3s;
}

.phonetic-card:nth-child(4) {
    animation-delay: 0.4s;
}

.phonetic-card:nth-child(5) {
    animation-delay: 0.5s;
}

.phonetic-card:nth-child(6) {
    animation-delay: 0.6s;
}

.phonetic-card:nth-child(7) {
    animation-delay: 0.7s;
}

.phonetic-card:nth-child(8) {
    animation-delay: 0.8s;
}

/* 语音辨析 */
.discrimination-exercise {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(248, 250, 252, 0.8));
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .discrimination-exercise {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.8));
}

.discrimination-exercise::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.discrimination-exercise h4 {
    font-size: 1.6rem;
    margin-bottom: 30px;
    color: var(--text-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 12px;
    position: relative;
    display: inline-block;
}

.discrimination-exercise h4::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.exercise-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 32px;
    margin-bottom: 25px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(248, 250, 252, 0.8));
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .exercise-card {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.8));
}

.exercise-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.exercise-card:hover::before {
    transform: scaleX(1);
}

.exercise-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

[data-theme="dark"] .exercise-card:hover {
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.exercise-audio {
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    width: 70px;
    height: 70px;
    font-size: 1.4rem;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 25px;
    box-shadow: 0 6px 25px rgba(124, 58, 237, 0.4);
    position: relative;
    overflow: hidden;
}

.exercise-audio::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.6s ease;
}

.exercise-audio:hover::before {
    left: 100%;
}

.exercise-audio:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 8px 30px rgba(124, 58, 237, 0.6);
}

.exercise-audio i {
    transition: var(--transition);
}

.exercise-audio:hover i {
    transform: scale(1.1);
}

.options {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.option {
    flex: 1;
    min-width: 140px;
    padding: 14px 24px;
    border: 2px solid var(--border-color);
    border-radius: 50px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.option::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left 0.4s ease;
    z-index: -1;
    border-radius: 50px;
}

.option:hover::before {
    left: 0;
}

.option:hover {
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(124, 58, 237, 0.4);
    border-color: var(--primary-color);
}

.option.correct {
    background: linear-gradient(135deg, var(--secondary-color), #27ae60);
    color: white;
    border-color: var(--secondary-color);
    box-shadow: 0 6px 25px rgba(46, 204, 113, 0.4);
}

.option.incorrect {
    background: linear-gradient(135deg, var(--accent-color), #c0392b);
    color: white;
    border-color: var(--accent-color);
    box-shadow: 0 6px 25px rgba(231, 76, 60, 0.4);
}

.feedback {
    padding: 12px 20px;
    border-radius: 10px;
    font-weight: 600;
    margin-top: 15px;
    transition: var(--transition);
    text-align: center;
    border: 1px solid transparent;
}

.feedback.correct {
    background-color: rgba(46, 204, 113, 0.1);
    color: var(--secondary-color);
    border-color: var(--secondary-color);
    box-shadow: 0 2px 10px rgba(46, 204, 113, 0.2);
}

.feedback.incorrect {
    background-color: rgba(231, 76, 60, 0.1);
    color: var(--accent-color);
    border-color: var(--accent-color);
    box-shadow: 0 2px 10px rgba(231, 76, 60, 0.2);
}

/* 练习卡片动画 */
.exercise-card {
    animation: fadeInUp 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    opacity: 0;
}

.exercise-card:nth-child(1) {
    animation-delay: 0.1s;
}

.exercise-card:nth-child(2) {
    animation-delay: 0.2s;
}

.exercise-card:nth-child(3) {
    animation-delay: 0.3s;
}

.exercise-card:nth-child(4) {
    animation-delay: 0.4s;
}

.exercise-card:nth-child(5) {
    animation-delay: 0.5s;
}

.exercise-card:nth-child(6) {
    animation-delay: 0.6s;
}

/* 发音对比 */
.comparison-pairs {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(248, 250, 252, 0.8));
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .comparison-pairs {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.8));
}

.comparison-pairs::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.comparison-pairs h4 {
    font-size: 1.6rem;
    margin-bottom: 30px;
    color: var(--text-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 12px;
    position: relative;
    display: inline-block;
}

.comparison-pairs h4::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.pair-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 32px;
    margin-bottom: 25px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 25px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(248, 250, 252, 0.8));
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .pair-card {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.8));
}

.pair-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.pair-card:hover::before {
    transform: scaleX(1);
}

.pair-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

[data-theme="dark"] .pair-card:hover {
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.sound-item {
    flex: 1;
    text-align: center;
    transition: var(--transition);
}

.sound-item:hover {
    transform: scale(1.05);
}

.sound-symbol {
    font-size: 3rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 15px;
    transition: var(--transition);
    display: inline-block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sound-item:hover .sound-symbol {
    transform: scale(1.1) rotate(5deg);
}

.sound-examples p {
    margin-bottom: 15px;
    color: var(--text-light);
    transition: var(--transition);
    font-weight: 500;
}

.sound-item:hover .sound-examples p {
    color: var(--text-color);
    transform: translateY(-2px);
}

.vs {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--primary-color);
    padding: 0 15px;
    transition: var(--transition);
    background-color: rgba(124, 58, 237, 0.1);
    padding: 10px 20px;
    border-radius: 50px;
    border: 2px solid var(--primary-color);
}

.pair-card:hover .vs {
    transform: scale(1.1) rotate(5deg);
    background-color: rgba(124, 58, 237, 0.2);
}

/* 发音对比卡片动画 */
.pair-card {
    animation: fadeInUp 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    opacity: 0;
}

.pair-card:nth-child(1) {
    animation-delay: 0.1s;
}

.pair-card:nth-child(2) {
    animation-delay: 0.2s;
}

.pair-card:nth-child(3) {
    animation-delay: 0.3s;
}

/* 语音进度 */
.voice-progress {
    margin-top: 80px;
    margin-bottom: 60px;
    position: relative;
}

.voice-progress::before {
    content: '';
    position: absolute;
    top: -20px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.voice-progress h3 {
    font-size: 1.8rem;
    margin-bottom: 35px;
    text-align: center;
    color: var(--text-color);
    position: relative;
    padding-bottom: 15px;
}

.voice-progress h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* 进度卡片样式 */
.progress-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(248, 250, 252, 0.8));
    position: relative;
    overflow: hidden;
    text-align: center;
}

[data-theme="dark"] .progress-card {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: linear-gradient(145deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.8));
}

.progress-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.progress-card:hover::before {
    transform: scaleX(1);
}

.progress-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

[data-theme="dark"] .progress-card:hover {
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.progress-card h4 {
    font-size: 1.4rem;
    margin-bottom: 25px;
    color: var(--text-color);
    transition: var(--transition);
}

.progress-card:hover h4 {
    color: var(--primary-color);
    transform: translateY(-2px);
}

.progress-bar {
    width: 100%;
    height: 15px;
    background-color: var(--bg-light);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 20px;
    position: relative;
    box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.1);
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 10px;
    transition: width 1s ease;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: progressShine 2s infinite;
}

@keyframes progressShine {
    0% {
        left: -100%;
    }
    100% {
        left: 100%;
    }
}

.progress-card p {
    color: var(--text-light);
    transition: var(--transition);
    font-weight: 500;
}

.progress-card:hover p {
    color: var(--text-color);
    transform: translateY(-2px);
}

/* 进度条数值显示 */
.progress-fill::before {
    content: attr(data-percent);
    position: absolute;
    top: 50%;
    right: 10px;
    transform: translateY(-50%);
    color: white;
    font-size: 0.8rem;
    font-weight: bold;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* 进度卡片动画 */
.progress-card {
    animation: fadeInUp 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    opacity: 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .page-header {
        padding: 80px 0;
    }
    
    .page-header h2 {
        font-size: 2.5rem;
    }
    
    .voice-tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .voice-tab {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
    
    .rule-cards,
    .phonetics-grid {
        grid-template-columns: 1fr;
    }
    
    .pair-card {
        flex-direction: column;
        gap: 15px;
    }
    
    .vs {
        transform: rotate(90deg);
    }
    
    .options {
        flex-direction: column;
    }
    
    .option {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .page-header h2 {
        font-size: 2rem;
    }
    
    .rule-card,
    .exercise-card,
    .pair-card {
        padding: 24px;
    }
    
    .phonetic-cards {
        grid-template-columns: 1fr;
    }
    
    .exercise-audio {
        width: 60px;
        height: 60px;
        font-size: 1.2rem;
    }
}