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

/* 基础样式设置 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    padding: 20px;
}

/* 容器样式 */
.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* 页头样式 */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    font-weight: 600;
}

header p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* 主体内容样式 */
main {
    padding: 30px;
}

/* 输入区域样式 */
.input-section {
    margin-bottom: 25px;
}

#inputText {
    width: 100%;
    min-height: 150px;
    padding: 15px;
    border: 2px solid #e1e1e1;
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    resize: vertical;
    transition: border-color 0.3s ease;
}

#inputText:focus {
    outline: none;
    border-color: #667eea;
}

#inputText::placeholder {
    color: #999;
}

/* 选项区域样式 */
.options-section {
    margin-bottom: 25px;
}

.option-group {
    margin-bottom: 15px;
}

.option-group label {
    display: inline-block;
    margin-right: 10px;
    font-weight: 500;
    font-size: 1rem;
}

#conversionType {
    padding: 8px 12px;
    border: 2px solid #e1e1e1;
    border-radius: 6px;
    font-size: 1rem;
    background-color: #fff;
    cursor: pointer;
    transition: border-color 0.3s ease;
}

#conversionType:focus {
    outline: none;
    border-color: #667eea;
}

/* 按钮样式 */
.buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

#convertBtn {
    background-color: #667eea;
    color: white;
}

#convertBtn:hover {
    background-color: #5a67d8;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

#clearBtn {
    background-color: #e2e8f0;
    color: #4a5568;
}

#clearBtn:hover {
    background-color: #cbd5e0;
}

#copyBtn {
    background-color: #38a169;
    color: white;
}

#copyBtn:hover {
    background-color: #2f855a;
}

/* 结果区域样式 */
.result-section h3 {
    margin-bottom: 10px;
    color: #4a5568;
    font-size: 1.2rem;
}

.result-box {
    min-height: 100px;
    padding: 15px;
    border: 2px solid #e1e1e1;
    border-radius: 8px;
    background-color: #f9fafb;
    white-space: pre-wrap;
    word-break: break-word;
}

/* 页脚样式 */
footer {
    text-align: center;
    padding: 20px;
    background-color: #f7fafc;
    border-top: 1px solid #e2e8f0;
    font-size: 0.9rem;
    color: #718096;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    header {
        padding: 20px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    main {
        padding: 20px;
    }
    
    .buttons {
        flex-direction: column;
    }
    
    button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    #inputText {
        font-size: 0.9rem;
    }
}