* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
            background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
            min-height: 100vh;
            padding: 20px;
            color: #2e7d32;
        }

        .divLineContainer {
            text-align: center;
            /* display: none; */
            /* margin-bottom: 30px; */
            padding: 5px 0;
        }

        .divLine {
            display: inline-block;
            font-size: 0.5rem;
            font-weight: bold;
            color: #1b5e20;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
            position: relative;
            padding-bottom: 10px;
        }

        .divLine::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, #4caf50, #66bb6a);
            border-radius: 2px;
        }
        
        #problemBase {
            /* 固定定位 —— 始终固定在视口左上角区域 */
            position: fixed;
            top: 20px;
            left: 20px;
            /* 保证按钮位于所有内容之上 */
            z-index: 9999;
            
            /* 圆形核心尺寸：宽高相等 + 圆角50% */
            width: 30px;
            height: 30px;
            border-radius: 50%;
            
            /* 绿色基调的惊艳渐变 (主色调: 鲜绿 → 深翡翠绿) */
            background: linear-gradient(145deg, #2ecc71, #239b56);
            
            /* 精致多层阴影：外部柔光，内部微沉，打造立体高级感 */
            box-shadow: 0 12px 22px -8px rgba(0, 60, 0, 0.35),
                        0 2px 4px -1px rgba(0, 0, 0, 0.1),
                        inset 0 -2px 0 rgba(0, 0, 0, 0.1),
                        inset 0 1px 2px rgba(255, 255, 255, 0.5);
            
            /* 弹性盒居中内容 (文字/图标) */
            display: flex;
            align-items: center;
            justify-content: center;
            
            /* 增加平滑过渡，任何属性改变都优雅 */
            transition: all 0.25s cubic-bezier(0.2, 0.9, 0.4, 1.1);
            
            /* 鼠标指针指示可交互 */
            cursor: pointer;
            
            /* 防止点击时出现浏览器默认外轮廓，保留焦点但优化视觉 */
            outline: none;
            
            /* 用户无法选中其中的文字 */
            user-select: none;
            
            /* 确保背景和内容圆润无溢出 */
            overflow: hidden;
            
            /* 额外：纯白软玻璃质感叠加层预备（高光, 在伪元素实现） */
            position: relative;
        }
        
        /* 漂亮高光效果: 增加一层细腻的光泽，使圆形按钮像一颗翡翠 */
       #problemBase::before {
            content: "";
            position: absolute;
            top: 5%;
            left: 8%;
            width: 38%;
            height: 32%;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.65) 0%, rgba(255, 255, 255, 0) 80%);
            border-radius: 50%;
            pointer-events: none;  /* 让高光层不干扰点击 */
            filter: blur(1px);
            transition: opacity 0.2s;
        } 
        
        /* 再增加一个柔光内圈增加质感，形成微妙的“果冻”感 */
        #problemBase::after {
            content: "";
            position: absolute;
            inset: 3px;
            border-radius: 50%;
            background: radial-gradient(circle at 30% 30%, rgba(200, 255, 200, 0.25), rgba(0, 0, 0, 0.05) 80%);
            pointer-events: none;
            transition: opacity 0.3s;
        }
        .myReview {
            max-width: 1200px;
            margin: 0 auto 30px;
            display: flex;
            gap: 20px;
        }

        .myReview a {
            flex: 1;
            display: block;
            text-decoration: none;
            background: linear-gradient(135deg, #4caf50 0%, #66bb6a 100%);
            color: white;
            padding: 18px 30px;
            border-radius: 12px;
            font-size: 1.2rem;
            font-weight: 600;
            text-align: center;
            box-shadow: 0 4px 15px rgba(76, 175, 80, 0.3);
            transition: all 0.3s ease;
        }

        .myReview a:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(76, 175, 80, 0.4);
            background: linear-gradient(135deg, #66bb6a 0%, #81c784 100%);
        }

        .menuContainer {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .subCover {
            background: white;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            border: 2px solid transparent;
        }

        .subCover:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 30px rgba(76, 175, 80, 0.25);
            border-color: #4caf50;
        }

        .coverPos {
            background: linear-gradient(135deg, #2e7d32 0%, #4caf50 100%);
            color: white;
            padding: 20px;
            font-size: 1.5rem;
            font-weight: bold;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .coverPos::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
            animation: shimmer 3s infinite;
        }

        @keyframes shimmer {
            0%, 100% {
                transform: rotate(0deg);
            }
            50% {
                transform: rotate(180deg);
            }
        }

        .subMenuCont {
            padding: 15px;
        }

        .subMenuCont a {
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
        }

        .subMenuCont a:last-child {
            margin-bottom: 0;
        }

        .subMenu {
            background: linear-gradient(135deg, #f1f8f4 0%, #e8f5e9 100%);
            color: #2e7d32;
            padding: 15px 20px;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 500;
            transition: all 0.3s ease;
            border-left: 4px solid #4caf50;
            position: relative;
            overflow: hidden;
        }

        .subMenu::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            height: 100%;
            width: 0;
            background: linear-gradient(90deg, rgba(76, 175, 80, 0.1), transparent);
            transition: width 0.3s ease;
        }

        .subMenu:hover {
            background: linear-gradient(135deg, #c8e6c9 0%, #a5d6a7 100%);
            transform: translateX(5px);
            box-shadow: 0 4px 12px rgba(76, 175, 80, 0.2);
            border-left-color: #2e7d32;
        }

        .subMenu:hover::before {
            width: 100%;
        }

        @media (max-width: 768px) {
            .divLine {
                font-size: 2rem;
            }

            .menuContainer {
                grid-template-columns: 1fr;
            }

            .myReview {
                flex-direction: column;
            }

            .myReview a {
                font-size: 1rem;
                padding: 15px 20px;
            }
        }