/* 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: #2d5a27;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 容器布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 0;
}

.header h1 {
    font-size: 2.5rem;
    color: #1a4d1a;
    margin-bottom: 10px;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(26, 77, 26, 0.1);
}

.subtitle {
    font-size: 1.1rem;
    color: #4a7c59;
    opacity: 0.8;
}

/* 主内容区域 */
.main-content {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

/* 加载动画 */
.loading {
    text-align: center;
    padding: 60px 20px;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #e8f5e8;
    border-top: 4px solid #4caf50;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading p {
    color: #4a7c59;
    font-size: 1.1rem;
}

/* 题目容器 */
.question-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(26, 77, 26, 0.1);
    border: 2px solid rgba(76, 175, 80, 0.2);
    width: 100%;
    max-width: 800px;
    backdrop-filter: blur(10px);
}

/* 题目头部 */
.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e8f5e8;
}

.question-id {
    font-size: 1.1rem;
    color: #4caf50;
    font-weight: 600;
    background: linear-gradient(135deg, #e8f5e8, #c8e6c9);
    padding: 8px 16px;
    border-radius: 20px;
}

.refresh-btn {
    background: linear-gradient(135deg, #4caf50, #45a049);
    border: none;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.refresh-btn:hover {
    transform: rotate(180deg) scale(1.1);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.3);
}

/* 题目文本 */
.question-text h2 {
    font-size: 1.5rem;
    color: #1a4d1a;
    margin-bottom: 25px;
    text-align: center;
}

/* 代码块 */
.code-block {
    background: #f8f9fa;
    border: 2px solid #e8f5e8;
    border-radius: 12px;
    margin: 25px 0;
    overflow-x: auto;
    position: relative;
}

.code-block pre {
    margin: 0;
    padding: 25px;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    color: #2d5a27;
    white-space: pre-wrap;
    word-wrap: break-word;
    background: transparent !important;
}

.code-block code {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    background: transparent !important;
}

/* 代码高亮自定义样式 - 丰富的语法高亮 */
.code-block .hljs {
    background: transparent !important;
    color: #333333 !important;
}

/* JavaScript 关键字 - 蓝色 */
.code-block .hljs-keyword {
    color: #0066cc !important;
    font-weight: 600;
}

/* 字符串 - 绿色 */
.code-block .hljs-string {
    color: #22aa22 !important;
}

/* 数字 - 橙色 */
.code-block .hljs-number {
    color: #ff6600 !important;
}

/* 函数名 - 紫色 */
.code-block .hljs-function,
.code-block .hljs-title.function_ {
    color: #9933cc !important;
    font-weight: 600;
}

/* 变量名 - 深蓝色 */
.code-block .hljs-variable,
.code-block .hljs-name {
    color: #0066aa !important;
}

/* 注释 - 灰色 */
.code-block .hljs-comment {
    color: #888888 !important;
    font-style: italic;
}

/* 内置对象和方法 - 深紫色 */
.code-block .hljs-built_in {
    color: #663399 !important;
    font-weight: 500;
}

/* 字面量 (true, false, null) - 红色 */
.code-block .hljs-literal {
    color: #cc0000 !important;
    font-weight: 600;
}

/* 操作符 - 深灰色 */
.code-block .hljs-operator {
    color: #666666 !important;
}

/* 标点符号 - 深灰色 */
.code-block .hljs-punctuation {
    color: #666666 !important;
}

/* 属性名 - 深蓝色 */
.code-block .hljs-property,
.code-block .hljs-attr {
    color: #0066aa !important;
}

/* 类名和构造函数 - 深绿色 */
.code-block .hljs-title.class_,
.code-block .hljs-title {
    color: #228833 !important;
    font-weight: 600;
}

/* 参数 - 深蓝色 */
.code-block .hljs-params {
    color: #0066aa !important;
}

/* 正则表达式 - 深红色 */
.code-block .hljs-regexp {
    color: #aa0066 !important;
}

/* 模板字符串 - 深绿色 */
.code-block .hljs-template-variable,
.code-block .hljs-template-tag {
    color: #228833 !important;
}

/* 选项容器 */
.options-container {
    margin: 30px 0;
}

.option {
    background: rgba(255, 255, 255, 0.8);
    border: 2px solid #e8f5e8;
    border-radius: 12px;
    padding: 15px 20px;
    margin: 12px 0;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    position: relative;
    overflow: hidden;
}

.option:hover {
    border-color: #4caf50;
    background: rgba(76, 175, 80, 0.05);
    transform: translateX(5px);
}

.option.selected {
    border-color: #4caf50;
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.1), rgba(76, 175, 80, 0.05));
    color: #1a4d1a;
    font-weight: 600;
}

.option.correct {
    border-color: #4caf50;
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.2), rgba(76, 175, 80, 0.1));
    color: #1a4d1a;
}

.option.incorrect {
    border-color: #f44336;
    background: linear-gradient(135deg, rgba(244, 67, 54, 0.1), rgba(244, 67, 54, 0.05));
    color: #c62828;
}

/* 按钮样式 */
.action-buttons {
    display: flex;
    gap: 15px;
    margin: 30px 0;
    justify-content: center;
    flex-wrap: wrap;
}

.submit-btn, .show-answer-btn, .retry-btn, .export-btn {
    padding: 12px 30px;
    border: none;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.submit-btn {
    background: linear-gradient(135deg, #4caf50, #45a049);
    color: white;
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.3);
}

.submit-btn:disabled {
    background: #cccccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.show-answer-btn {
    background: linear-gradient(135deg, #2196f3, #1976d2);
    color: white;
}

.show-answer-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(33, 150, 243, 0.3);
}

.retry-btn {
    background: linear-gradient(135deg, #ff9800, #f57c00);
    color: white;
}

.retry-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 152, 0, 0.3);
}

.export-btn {
    background: linear-gradient(135deg, #9c27b0, #7b1fa2);
    color: white;
}

.export-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(156, 39, 176, 0.3);
}

.export-btn svg {
    width: 16px;
    height: 16px;
}

/* 结果容器 */
.result-container {
    margin-top: 30px;
    padding: 25px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    border: 2px solid #e8f5e8;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e8f5e8;
}

.result-status {
    font-size: 1.2rem;
    font-weight: 600;
}

.result-status.correct {
    color: #4caf50;
}

.result-status.incorrect {
    color: #f44336;
}

.correct-answer {
    font-weight: 600;
    color: #4caf50;
    background: rgba(76, 175, 80, 0.1);
    padding: 5px 12px;
    border-radius: 15px;
}

.explanation {
    color: #2d5a27;
    line-height: 1.7;
    font-size: 1rem;
}

.explanation pre {
    background: #f8f9fa;
    border: 1px solid #e8f5e8;
    border-radius: 8px;
    padding: 15px;
    margin: 15px 0;
    overflow-x: auto;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

/* 错误容器 */
.error-container {
    text-align: center;
    padding: 60px 20px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    border: 2px solid rgba(244, 67, 54, 0.2);
    max-width: 500px;
    margin: 0 auto;
}

.error-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.error-container h3 {
    color: #f44336;
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.error-container p {
    color: #666;
    margin-bottom: 25px;
    font-size: 1.1rem;
}

/* 底部 */
.footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 40px;
    color: #4a7c59;
    opacity: 0.7;
    border-top: 1px solid rgba(76, 175, 80, 0.2);
}

/* 平板端适配 (768px - 1024px) */
@media (max-width: 1024px) and (min-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .header h1 {
        font-size: 2.2rem;
    }
    
    .question-container {
        padding: 30px;
    }
    
    .action-buttons {
        flex-wrap: wrap;
    }
}

/* 手机端适配 (最大768px) */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .header {
        margin-bottom: 25px;
        padding: 20px 0;
    }
    
    .header h1 {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .question-container {
        padding: 20px;
        border-radius: 15px;
    }
    
    .question-header {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
    
    .question-text h2 {
        font-size: 1.3rem;
    }
    
    .code-block pre {
        padding: 15px;
        font-size: 0.85rem;
    }
    
    .option {
        padding: 12px 15px;
        font-size: 0.95rem;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .submit-btn, .show-answer-btn, .retry-btn {
        width: 100%;
        max-width: 200px;
    }
    
    .result-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    .explanation {
        font-size: 0.95rem;
    }
    
    .explanation pre {
        padding: 10px;
        font-size: 0.8rem;
    }
}

/* 小屏手机适配 (最大480px) */
@media (max-width: 480px) {
    .container {
        padding: 8px;
    }
    
    .header h1 {
        font-size: 1.6rem;
    }
    
    .question-container {
        padding: 15px;
    }
    
    .question-id {
        font-size: 1rem;
        padding: 6px 12px;
    }
    
    .refresh-btn {
        width: 40px;
        height: 40px;
    }
    
    .code-block pre {
        font-size: 0.8rem;
        padding: 12px;
    }
    
    .option {
        padding: 10px 12px;
        font-size: 0.9rem;
    }
    
    .submit-btn, .show-answer-btn, .retry-btn {
        padding: 10px 20px;
        font-size: 0.95rem;
    }
}