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

:root {
    --translation-display: none; /* 默认隐藏中文释义 */
}

body {
    font-family: 'Arial', sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: #2c3e50;
    color: #fff;
    padding: 20px;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.sidebar h2 {
    color: #ecf0f1;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #34495e;
    font-size: 1.5rem;
    text-align: center;
}

/* 中文释义样式 */

.nav-list {
    list-style: none;
}

.nav-item {
    margin-bottom: 10px;
}

.nav-link {
    display: block;
    padding: 10px 15px;
    color: #ecf0f1;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.nav-link:hover, .nav-link.active {
    background-color: #34495e;
    transform: translateX(5px);
}

.main-content {
    flex: 1;
    margin-left: 250px;
    padding: 20px;
    overflow: hidden;
}

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

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
    font-size: 2.5rem;
}

.modules-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
    gap: 30px;
}

.module {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    transition: transform 0.3s ease;
}

.module:hover {
    transform: translateY(-5px);
}

.module h2, .module-content h2 {
    color: #e74c3c;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 2px solid #ecf0f1;
    font-size: 1.8rem;
}

.module-content {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin: 20px auto;
    max-width: 1000px;
}

.words-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.word-item {
    display: flex;
    flex-direction: column;
    padding: 10px;
    border-radius: 5px;
    background-color: #f8f9fa;
    transition: all 0.3s ease;
    cursor: pointer;
}

.word-item:hover {
    background-color: #e3f2fd;
    transform: scale(1.05);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.word-item.playing {
    background-color: #bbdefb;
    transform: scale(1.05);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
}

.word {
    font-weight: bold;
    color: #2980b9;
    font-size: 1.2rem;
    margin-bottom: 5px;
}

.phrase {
    font-weight: bold;
    color: #2980b9;
    font-size: 1.1rem;
    margin-bottom: 5px;
    font-style: italic;
}

.translation {
    color: #7f8c8d;
    font-size: 0.9rem;
    visibility: hidden;
    transition: visibility 0.3s ease;
}

/* 确保对话框中的翻译也能正确响应切换 */
.speech .translation {
    visibility: hidden;
    transition: visibility 0.3s ease;
}

/* 鼠标悬停时显示中文释义 */
.word-item:hover .translation,
.speech-text:hover + .translation,
.speech-text:hover .translation {
    visibility: visible;
}

/* 汉堡菜单按钮 */
.menu-toggle {
    display: none;
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 1000;
    background-color: #2c3e50;
    color: #fff;
    border: none;
    border-radius: 5px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 1.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        position: fixed;
        top: 0;
        left: -100%;
        z-index: 999;
        transition: left 0.3s ease;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .main-content {
        margin-left: 0;
        width: 100%;
        padding-top: 60px;
    }
    
    .modules-container {
        grid-template-columns: 1fr;
    }
    
    .words-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .module h2 {
        font-size: 1.5rem;
    }
    
    /* 调整iframe高度以适应移动设备 */
    #module-frame {
        height: calc(100vh - 60px);
    }
}