* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
     
      
        
        .background-section {
            position: relative;
            width: 100%;
            height: 900px;
            transition: background-image 0.5s ease;
            background-size: cover;
            background-position: center;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        
        .content-wrapper {
            position: relative;
            width: 80%;
            height: 80%;
            display: flex;
            z-index: 10;
        }
        
        /* 左侧方块导航 */
        .nav-container {
            flex: 1;
            display: grid;
            grid-template-rows: repeat(3, 1fr);
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            height: 100%;
        }
        
        .nav-item {
            background-color: transparent;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            color: white;
            text-decoration: none;
            font-size: 1.4rem;
            transition: all 0.3s ease;
            border: 2px solid rgba(255, 255, 255, 0.8);
            text-align: center;
            padding: 20px;
            border-radius: 4px;
            backdrop-filter: blur(5px);
            background-color: rgba(0, 0, 0, 0.2);
        }
        
        .nav-item i {
            font-size: 2.5rem;
            margin-bottom: 15px;
            color: #fff;
        }
        
        .nav-item:hover {
            background-color: rgba(200, 0, 0, 0.8);
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(255, 0, 0, 0.3);
            border-color: rgba(255, 255, 255, 1);
            color: #fff;
            text-decoration: none;
        }
        
        .item-1 {
            grid-column: 1;
            grid-row: 1;
        }
        
        .item-2 {
            grid-column: 1;
            grid-row: 2;
        }
        
        .item-3 {
            grid-column: 2;
            grid-row: 2;
        }
        
        .item-4 {
            grid-column: 2;
            grid-row: 3;
        }
        
        /* 右侧内容区域 */
        .content-section {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            padding-left: 60px;
            color: white;
        }
        
        .solution-title {
            font-size: 3.5rem;
            margin-bottom: 25px;
            text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.7);
            font-weight: 700;
        }
        
        .solution-desc {
            font-size: 1.2rem;
            line-height: 1.6;
            margin-bottom: 40px;
            max-width: 500px;
            text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.7);
        }
        
        .view-more-btn {
            display: inline-block;
            padding: 18px 45px;
            background: transparent;
            color: white;
            border: 2px solid white;
            text-decoration: none;
            font-size: 1.2rem;
            font-weight: 600;
            transition: all 0.3s ease;
            text-align: center;
            width: fit-content;
            border-radius: 4px;
            letter-spacing: 1px;
        }
        
        .view-more-btn:hover {
            background-color: #ff0000;
             color: #fff;
            text-decoration: none;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(255, 255, 255, 0.3);
        }
        
        .view-more-btn i {
            margin-left: 10px;
            transition: transform 0.3s ease;
        }
        
        .view-more-btn:hover i {
            transform: translateX(5px);
        }
        
        /* 响应式设计 */
        @media (max-width: 1200px) {
            .content-wrapper {
                width: 90%;
            }
            
            .solution-title {
                font-size: 3rem;
            }
        }
        
        @media (max-width: 992px) {
            .content-wrapper {
                flex-direction: column;
                height: auto;
            }
            
            .nav-container {
                grid-template-rows: repeat(2, 1fr);
                grid-template-columns: repeat(2, 1fr);
                margin-bottom: 40px;
                height: 500px;
            }
            
            .content-section {
                padding-left: 0;
                align-items: center;
                text-align: center;
            }
            
            .solution-title {
                font-size: 2.5rem;
            }
            
            .solution-desc {
                max-width: 100%;
            }
        }
        
        @media (max-width: 576px) {
            .background-section {
                height: auto;
                min-height: 900px;
            }
            
            .content-wrapper {
                margin: 20px 0;
            }
            
            .nav-container {
                gap: 15px;
                height: 400px;
            }
            
            .nav-item {
                font-size: 1.1rem;
                padding: 15px;
            }
            
            .nav-item i {
                font-size: 2rem;
                margin-bottom: 10px;
            }
            
            .solution-title {
                font-size: 2rem;
            }
            
            .solution-desc {
                font-size: 1rem;
            }
            
            .view-more-btn {
                padding: 15px 35px;
                font-size: 1rem;
            }
        }
        
        .bg-controls {
            position: absolute;
            bottom: 20px;
            right: 20px;
            z-index: 20;
            display: flex;
            gap: 10px;
        }
        
        .bg-btn {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.5);
            cursor: pointer;
            transition: all 0.3s ease;
        }
        
        .bg-btn.active {
            background: #ff6b6b;
            transform: scale(1.3);
           
        }