/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #2c3e50;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部样式 */
header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    color: #27ae60;
    font-size: 2rem;
    margin-bottom: 20px;
    font-weight: 600;
}

/* 模式选择器 */
.mode-selector {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.mode-btn {
    padding: 8px 16px;
    border: 2px solid #27ae60;
    background: transparent;
    color: #27ae60;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.mode-btn:hover {
    background: #27ae60;
    color: white;
    transform: translateY(-2px);
}

.mode-btn.active {
    background: #27ae60;
    color: white;
}

/* 主要内容区域 */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* 词汇卡片 */
.vocabulary-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(39, 174, 96, 0.1);
    text-align: center;
    margin-bottom: 30px;
    width: 100%;
    max-width: 500px;
    border: 2px solid #e8f5e8;
    transition: all 0.3s ease;
}

.vocabulary-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(39, 174, 96, 0.15);
}

.word-number {
    color: #95a5a6;
    font-size: 14px;
    margin-bottom: 20px;
    font-weight: 500;
}

.word-content {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.english-word {
    font-size: 2.5rem;
    font-weight: 700;
    color: #27ae60;
    margin-bottom: 10px;
}

.phonetic {
    font-size: 1.2rem;
    color: #7f8c8d;
    font-style: italic;
}

.word-type {
    font-size: 1rem;
    color: #e67e22;
    font-weight: 600;
}

.chinese-meaning {
    font-size: 1.3rem;
    color: #2c3e50;
    font-weight: 500;
    line-height: 1.5;
}

/* 进度信息 */
.progress-info {
    color: #7f8c8d;
    font-size: 16px;
    margin-bottom: 30px;
    font-weight: 500;
}

/* 控制按钮 */
.control-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.control-btn {
    padding: 12px 24px;
    border: 2px solid #27ae60;
    background: transparent;
    color: #27ae60;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    min-width: 100px;
}

.control-btn:hover {
    background: #27ae60;
    color: white;
    transform: translateY(-2px);
}

.control-btn.primary {
    background: #27ae60;
    color: white;
}

.control-btn.primary:hover {
    background: #219a52;
    transform: translateY(-2px);
}

.control-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.control-btn:disabled:hover {
    background: transparent;
    color: #27ae60;
    transform: none;
}



/* 平板端适配 (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
    .container {
        padding: 30px;
    }
    
    header h1 {
        font-size: 2.5rem;
    }
    
    .vocabulary-card {
        padding: 50px;
    }
    
    .english-word {
        font-size: 3rem;
    }
    
    .control-buttons {
        gap: 20px;
    }
    
    .control-btn {
        padding: 15px 30px;
        font-size: 18px;
        min-width: 120px;
    }
}

/* 电脑端适配 (1024px+) */
@media (min-width: 1024px) {
    .container {
        padding: 40px;
    }
    
    header h1 {
        font-size: 3rem;
    }
    
    .vocabulary-card {
        padding: 60px;
    }
    
    .english-word {
        font-size: 3.5rem;
    }
    
    .phonetic {
        font-size: 1.4rem;
    }
    
    .chinese-meaning {
        font-size: 1.5rem;
    }
    
    .control-buttons {
        gap: 25px;
    }
    
    .control-btn {
        padding: 15px 35px;
        font-size: 18px;
        min-width: 130px;
    }
    
    .mode-btn {
        padding: 10px 20px;
        font-size: 16px;
    }
    

}

/* 手机端优化 (最大767px) */
@media (max-width: 767px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 1.8rem;
        margin-bottom: 15px;
    }
    
    .mode-selector {
        gap: 8px;
        margin-bottom: 15px;
    }
    
    .mode-btn {
        padding: 6px 12px;
        font-size: 12px;
        border-radius: 15px;
    }
    
    .vocabulary-card {
        padding: 25px 20px;
        margin-bottom: 20px;
        border-radius: 15px;
    }
    
    .english-word {
        font-size: 2rem;
        margin-bottom: 8px;
    }
    
    .phonetic {
        font-size: 1rem;
    }
    
    .word-type {
        font-size: 0.9rem;
    }
    
    .chinese-meaning {
        font-size: 1.1rem;
    }
    
    .word-content {
        gap: 10px;
    }
    
    .progress-info {
        font-size: 14px;
        margin-bottom: 20px;
    }
    
    .control-buttons {
        gap: 10px;
        width: 100%;
    }
    
    .control-btn {
        padding: 10px 16px;
        font-size: 14px;
        min-width: 80px;
        flex: 1;
    }

}

/* 超小屏幕优化 (最大480px) */
@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .vocabulary-card {
        padding: 20px 15px;
    }
    
    .english-word {
        font-size: 1.8rem;
    }
    
    .control-buttons {
        flex-direction: column;
        gap: 8px;
    }
    
    .control-btn {
        width: 100%;
        min-width: auto;
    }
    

}