* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Helvetica Neue', Arial, sans-serif;
        }

        body {
            background-color: #ffffff;
            color: #000000;
            overflow-x: hidden;
            line-height: 1.6;
            font-size: 16px;
        }

        

        /* 主内容区域 - 移动端优化 */
        #main-content {
            margin-top: 70px;
            padding: 20px;
            max-width: 100%;
            margin-left: auto;
            margin-right: auto;
        }

        .page-header {
            text-align: center;
            margin-bottom: 40px;
            padding-top: 10px;
        }

        .page-header h1 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -1px;
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
            line-height: 1.2;
        }

        .page-header h1::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 100%;
            height: 3px;
            background: #000;
        }

        .page-header p {
            font-size: 1rem;
            max-width: 100%;
            margin: 0 auto;
            color: #555;
            line-height: 1.5;
        }

        /* 说明部分 - 移动端优化 */
        .section {
            margin-bottom: 40px;
            border: 2px solid #000;
            padding: 20px;
            position: relative;
            background: #fff;
        }

        .section-header {
            display: flex;
            align-items: flex-start;
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 1px solid #000;
            flex-direction: column;
        }

        .section-number {
            font-size: 2rem;
            font-weight: 800;
            margin-right: 0;
            margin-bottom: 10px;
            color: #000;
        }

        .section-title {
            font-size: 1.5rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            line-height: 1.3;
        }

        .subsection {
            margin-bottom: 25px;
        }

        .subsection-title {
            font-size: 1.2rem;
            font-weight: 600;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            line-height: 1.3;
        }

        .subsection-title::before {
            content: '';
            display: inline-block;
            width: 8px;
            height: 8px;
            background: #000;
            margin-right: 10px;
            flex-shrink: 0;
        }

        .subsection-content {
            padding-left: 18px;
        }

        .subsection-content p {
            margin-bottom: 10px;
            line-height: 1.5;
        }

        /* 图片展示区域 - 移动端优化 */
        .image-gallery {
            display: flex;
            gap: 15px;
            margin: 15px 0;
            overflow-x: auto;
            padding: 10px 5px;
            -webkit-overflow-scrolling: touch; /* 平滑滚动 */
        }

        .image-item {
            min-width: 240px;
            height: 164px;
            background: #f0f0f0;
            border: 2px solid #000;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .image-item img{
            max-width: 240px;
            height: 160px;
        }

        .image-item::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            //background: linear-gradient(135deg, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0) 60%);
        }

        .image-caption {
            text-align: center;
            font-size: 0.85rem;
            color: #555;
            margin-top: 5px;
        }

        /* 重要提示 - 移动端优化 */
        .important-note {
            background: rgba(255, 0, 0, 0.05);
            border: 2px solid #f00;
            padding: 15px;
            margin: 25px 0;
            position: relative;
        }

        .important-note::before {
            content: '!';
            position: absolute;
            top: -12px;
            left: -12px;
            width: 24px;
            height: 24px;
            background: #f00;
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 0.9rem;
        }

        .important-note h3 {
            color: #f00;
            margin-bottom: 8px;
            font-size: 1.2rem;
        }

        .important-note p {
            margin-bottom: 8px;
            line-height: 1.5;
        }

        /* 响应式调整 - 平板和桌面 */
        @media (min-width: 768px) {
            body {
                font-size: 18px;
            }
            
            #main-content {
                margin-top: 80px;
                padding: 40px;
                max-width: 1200px;
            }
            
            .page-header {
                margin-bottom: 60px;
                padding-top: 20px;
            }
            
            .page-header h1 {
                font-size: 3rem;
                margin-bottom: 20px;
            }
            
            .page-header h1::after {
                height: 4px;
                bottom: -10px;
            }
            
            .page-header p {
                font-size: 1.2rem;
                max-width: 800px;
            }
            
            .section {
                margin-bottom: 60px;
                padding: 30px;
            }
            
            .section-header {
                flex-direction: row;
                align-items: center;
                margin-bottom: 25px;
                padding-bottom: 15px;
            }
            
            .section-number {
                font-size: 2.5rem;
                margin-right: 15px;
                margin-bottom: 0;
            }
            
            .section-title {
                font-size: 1.8rem;
            }
            
            .subsection {
                margin-bottom: 30px;
            }
            
            .subsection-title {
                font-size: 1.3rem;
            }
            
            .image-gallery {
                gap: 20px;
                margin: 20px 0;
            }
            
            .image-item {
                min-width: 300px;
                height: 204px;
            }
            
        .image-item img{
            max-width: 300px;
            height: 200px;
        }
            .important-note {
                padding: 20px;
                margin: 30px 0;
            }
            
            .important-note::before {
                top: -15px;
                left: -15px;
                width: 30px;
                height: 30px;
            }
        }

        /* 大屏幕优化 */
        @media (min-width: 1200px) {
            #main-content {
                max-width: 1400px;
            }
            
            .desktop-submenu-container {
                max-width: 1400px;
            }
        }