:root {
            --primary-color: #0B3C5D;
            --secondary-color: #D9D9D9;
            --accent-color: #FF6B35;
            --dark-bg: #1D2B36;
            --light-bg: #F5F5F5;
        }
        
        html {
            scroll-behavior: smooth;
        }
        
        body {
            font-family: 'Noto Sans SC', sans-serif;
            color: #333;
            overflow-x: hidden;
        }
        
        .text-gradient {
            background: linear-gradient(90deg, var(--primary-color), #1D7CAE);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .bg-gradient {
            background: linear-gradient(135deg, var(--primary-color), #1D7CAE);
        }
        
        .nav-link {
            position: relative;
            transition: all 0.3s ease;
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent-color);
            transition: width 0.3s ease;
        }
        
        .nav-link:hover::after {
            width: 100%;
        }
        
        .service-card {
            transition: all 0.3s ease;
        }
        
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        }
        
        /* 滚动动画类 */
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        
        .fade-in.active {
            opacity: 1;
            transform: translateY(0);
        }
        
        /* 加载动画 */
        .loader {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--dark-bg);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 9999;
            transition: opacity 0.5s ease, visibility 0.5s ease;
        }
        
        .loader.hidden {
            opacity: 0;
            visibility: hidden;
        }
        
        .loader-circle {
            width: 50px;
            height: 50px;
            border: 5px solid rgba(255, 255, 255, 0.1);
            border-top: 5px solid var(--accent-color);
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }