* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: '微软雅黑', sans-serif;
        }

        /* 导航栏样式 */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 4.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 5%;
            background-color: #00489e;
            box-shadow: 0 0.125rem 0.625rem rgba(0, 0, 0, 0.1);
            z-index: 1000;
            transition: all 0.3s ease;
        }

        .logo-section {
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .logo {
            height: 3.125rem;
            width: auto;
            cursor: pointer;
        }

        .company-name {
            color: #fff;
            font-size: 1.5rem;
            font-weight: bold;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 2.5rem;
        }

        .nav-item {
            color: #fff;
            text-decoration: none;
            font-size: 1.1rem;
            cursor: pointer;
            transition: color 0.3s ease;
        }

        .nav-item:hover {
            color: #00b4ff;
        }

        .dropdown {
            position: relative;
        }

        .dropdown-content {
            display: none;
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%);
            background-color: white;
            min-width: 12.5rem;
            box-shadow: 0 0.125rem 0.625rem rgba(0, 0, 0, 0.1);
            border-radius: 0.25rem;
            padding: 0.5rem 0;
            margin-top: 0.5rem;
        }

        .dropdown-content::before {
            content: '';
            position: absolute;
            top: -1.25rem;
            left: 0;
            right: 0;
            height: 1.25rem;
            background: transparent;
        }

        .dropdown-content a {
            display: block;
            padding: 0.8rem 1.5rem;
            color: #333;
            text-decoration: none;
            transition: all 0.3s ease;
            text-align: center;
        }

        .dropdown-content a:hover {
            background-color: #f8f9fa;
            color: #00b4ff;
        }

        /* 同时支持悬停和点击显示下拉菜单 */
        .dropdown:hover .dropdown-content {
            display: block;
        }

        /* 移动端菜单按钮 */
        .menu-toggle {
            display: none;
            flex-direction: column;
            justify-content: space-between;
            width: 1.875rem;
            height: 1.25rem;
            cursor: pointer;
        }

        .menu-toggle span {
            display: block;
            height: 0.125rem;
            width: 100%;
            background-color: #fff;
            transition: all 0.3s ease;
        }

        /* 响应式布局 */
        @media (max-width: 1024px) {
            .navbar {
                padding: 0 3%;
            }

            .menu-toggle {
                display: flex;
            }

            .nav-links {
                display: none;
                position: absolute;
                top: 5rem;
                left: 0;
                width: 100%;
                background-color: #00489e;
                padding: 1rem 0;
                flex-direction: column;
                gap: 1rem;
            }

            .nav-links.active {
                display: flex;
            }

            .dropdown-content {
                position: static;
                transform: none;
                box-shadow: none;
                background-color: #003b82;
                margin-top: 0.5rem;
                width: 100%;
            }

            .dropdown-content a {
                color: #fff;
                padding: 0.8rem 2rem;
                text-align: left;
            }

            .dropdown-content a:hover {
                background-color: #002d64;
            }
        }

        @media (max-width: 768px) {
            .navbar {
                height: 3.75rem;
                padding: 0 2%;
            }

            .logo {
                height: 2.5rem;
            }

            .company-name {
                font-size: 1.2rem;
            }

            .nav-links {
                top: 3.75rem;
            }

            .nav-item {
                font-size: 1rem;
            }
        }

        /* 手机端 */
        @media (max-width: 576px) {
          .box { width: 100%; }
        }

        /* 平板 */
        @media (min-width: 577px) and (max-width: 992px) {
          .box { width: 50%; }
        }

        /* 桌面端 */
        @media (min-width: 993px) {
          .box { width: 25%; }
        }

        /* 滚动效果 */
        .navbar.scrolled {
            background-color: rgba(0, 72, 158, 0.95);
            backdrop-filter: blur(0.625rem);
        }