* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: "思源宋体", "微软雅黑", SimSun;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background: url("images/cloud_bg.png") repeat;
            background-color: #f7f3ef;
            background-blend-mode: multiply;
            padding-top: 70px;
            color: #333;
        }

        /* ========== 顶部导航 ========== */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            padding: 15px 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            z-index: 999;
        }

        .logo {
            color: #8B1A1A;
            font-size: 4.2rem;
            font-family: "华文行楷", "书法体", serif;
            letter-spacing: 3px;
        }

        /* 导航菜单基础样式 */
        nav {
            position: relative;
        }

        nav > ul {
            list-style: none;
            display: flex;
            gap: 35px;
        }

        nav > ul > li {
            position: relative;
        }

        nav > ul > li > a {
            color: #8B1A1A;;
            text-decoration: none;
            font-size: 1.5rem;
            transition: 0.3s;
            padding: 8px 0;
            display: block;
            font-family: "华文行楷", "书法体", serif;
        }

        nav > ul > li > a:hover {
            color: #8B1A1A;
        }

        /* 下拉菜单 */
        .dropdown {
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%);
            background: rgba(255,255,255,0.95);
            list-style: none;
            min-width: 180px;
            display: none;
            border-radius: 12px;
            padding: 15px 0;
            box-shadow: 0 4px 15px rgba(0,0,0,0.2);
        }

        .dropdown li a {
            display: block;
            padding: 12px 20px;
            color: #8B1A1A;
            font-size: 1.3rem;
            text-decoration: none;
            text-align: center;
            font-weight: bold;
            transition: 0.3s;
            font-family: "华文行楷", "书法体", serif;
        }

        .dropdown li a:hover {
            background: #a8201a;
            color: #fff;
        }

        nav > ul > li:hover .dropdown {
            display: block;
        }

        /* ========== 页面头部 ========== */
        .page-header {
            text-align: center;
            padding: 50px 20px 30px;
        }
        .page-header h1 {
            font-size: 2.8rem;
            color: #a8201a;
            font-family: "华文行楷", serif;
            margin-bottom: 15px;
        }
        .page-header p {
            max-width: 900px;
            margin: 0 auto;
            font-size: 1.1rem;
            line-height: 2;
            color: #555;
        }

        /* ========== 主体布局 ========== */
        .main-container {
            max-width: 1200px;
            margin: 0 auto 60px;
            padding: 0 20px;
            display: flex;
            gap: 30px;
        }

        /* 左侧目录 */
        .sidebar {
            width: 200px;
            flex-shrink: 0;
            background: #fff;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 3px 10px rgba(0,0,0,0.1);
        }
        .sidebar-title {
            background: #a8201a;
            color: #fff;
            padding: 15px;
            text-align: center;
            font-family: "华文行楷", serif;
            font-size: 1.2rem;
        }
        .sidebar-item {
            padding: 15px;
            text-align: center;
            cursor: pointer;
            border-bottom: 1px solid #eee;
            transition: 0.3s;
        }
        .sidebar-item:last-child {
            border-bottom: none;
        }
        .sidebar-item.active {
            background: #a8201a;
            color: #fff;
        }
        .sidebar-item:hover {
            background: #f5f5f5;
        }
        .sidebar-item.active:hover {
            background: #a8201a;
        }

        /* 右侧内容区 */
        .content-area {
            flex: 1;
            background: #fff;
            border-radius: 12px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
            padding: 40px;
        }
        .content-title {
            text-align: center;
            font-size: 2rem;
            color: #a8201a;
            font-family: "华文行楷", serif;
            margin-bottom: 25px;
            padding-bottom: 12px;
            border-bottom: 2px double #D4AF37;
        }
        .content-img {
            width: 100%;
            height: 320px;
            border: 2px dashed #D4AF37;
            border-radius: 8px;
            background: #f9f6f0;
            overflow: hidden;
            margin-bottom: 30px;
        }
        .content-img img{
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .content-text {
            font-size: 1.05rem;
            line-height: 2;
            text-indent: 2em;
            color: #444;
        }

        /* 返回按钮 */
        .back-btn {
            display: block;
            width: 160px;
            margin: 0 auto 50px;
            padding: 12px;
            background: #a8201a;
            color: #fff;
            text-align: center;
            text-decoration: none;
            border-radius: 30px;
            font-family: "华文行楷", serif;
            transition: 0.3s;
        }
        .back-btn:hover {
            background: #871714;
            transform: translateY(-3px);
        }

        footer {
            text-align: center;
            padding: 30px;
            background: #EAE2D5;
            color: #BFA07A;
            font-family: "华文行楷", serif;
            font-size: 9px;
        }

        /* 移动端适配 */
        @media (max-width: 768px) {
            .main-container {
                flex-direction: column;
            }
            .sidebar {
                width: 100%;
            }
            .content-img {
                height: 240px;
            }
            .nav-menu {
                gap: 15px;
            }
            .nav-menu li a {
                font-size: 0.9rem;
            }
            .logo-text {
                font-size: 1.2rem;
            }
            .logo-img {
                width: 36px;
                height: 36px;
            }
        }