/* 全局样式 */
body {
    font-family: 'PingFang SC', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    padding: 0;
    margin: 0;
    background-color: #f5f7fa;
    font-size: 14px;
}

/* 容器样式 */
.container {
    max-width: 800px;
    margin: 20px auto;
    background-color: #fff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
}

/* 标题区域 */
.title-container {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

/* 主标题 */
.main-title {
    font-size: 24px;
    color: #2c3e50;
    margin: 0;
    text-align: center;
}

/* 标题旁链接 */
.title-link {
    margin-left: 15px;
    color: #3498db;
    text-decoration: none;
    font-size: 15px;
    background-color: #f0f7ff;
    padding: 5px 10px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.title-link:hover {
    background-color: #e1f0ff;
    text-decoration: underline;
}

h2 {
    font-size: 20px;
    margin-top: 30px;
    margin-bottom: 15px;
    color: #2c3e50;
    padding-left: 15px;
    border-left: 4px solid #3498db;
}

/* 段落样式 */
p {
    margin-bottom: 15px;
    text-align: justify;
    color: #4a4a4a;
}

/* 列表样式 */
ul, ol {
    padding-left: 20px;
}

li {
    margin-bottom: 10px;
    position: relative;
    color: #4a4a4a;
}

ul li::before {
    content: "•";
    color: #3498db;
    font-weight: bold;
    display: inline-block;
    width: 1em;
    margin-left: -1em;
}

/* 高亮文本 */
.highlight {
    color: #e74c3c;
    font-weight: bold;
}

/* 版本信息 */
.version {
    text-align: right;
    font-size: 12px;
    color: #95a5a6;
    margin-top: 30px;
}

/* 底部导航 */
.footer-nav {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.footer-nav a {
    color: #3498db;
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.footer-nav a:hover {
    background-color: #f0f7ff;
    text-decoration: underline;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #3498db;
    color: white;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    text-align: center;
    line-height: 40px;
    cursor: pointer;
    opacity: 0.7;
    transition: all 0.3s ease;
    display: none;
}

.back-to-top:hover {
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        margin: 10px;
        padding: 20px;
    }
    
    .main-title {
        font-size: 22px;
    }
    
    h2 {
        font-size: 18px;
    }
    
    .title-container {
        flex-direction: column;
    }
    
    .title-link {
        margin-left: 0;
        margin-top: 10px;
    }
}