:root {
            --primary-color: #1a56db;
            --secondary-color: #0e2a52;
            --accent-color: #00a8ff;
            --light-color: #f8f9fa;
            --dark-color: #212529;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 500;
            padding: 0.5rem 1rem !important;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--accent-color) !important;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--secondary-color) 0%, var(--primary-color) 100%);
            color: white;
            padding: 6rem 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 L100,100 Z" fill="rgba(255,255,255,0.05)"/></svg>');
            background-size: cover;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 2.5rem;
            font-weight: 700;
        }
        .section-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 60px;
            height: 3px;
            background: var(--accent-color);
        }
        .text-center .section-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .card {
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .service-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .bg-light {
            background-color: #f8fafc !important;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.6rem 1.8rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #0c4cb3;
            border-color: #0c4cb3;
            transform: translateY(-2px);
        }
        .btn-outline-light:hover {
            color: var(--primary-color);
        }
        .stats-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--primary-color);
            display: block;
            line-height: 1;
        }
        .client-logo {
            filter: grayscale(100%);
            opacity: 0.6;
            transition: var(--transition);
        }
        .client-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .footer {
            background-color: var(--secondary-color);
            color: white;
        }
        .footer a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .flink {
            display: inline-block;
            padding: 0.3rem 0.8rem;
            margin: 0.2rem;
            background: rgba(255,255,255,0.1);
            border-radius: 4px;
            transition: var(--transition);
        }
        .flink:hover {
            background: rgba(255,255,255,0.2);
            transform: translateY(-3px);
        }
        .project-img {
            height: 220px;
            object-fit: cover;
            width: 100%;
        }
        .news-item {
            border-left: 3px solid var(--accent-color);
            padding-left: 1rem;
            margin-bottom: 1.5rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            opacity: 0;
            transition: var(--transition);
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--accent-color);
            color: white;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 4rem 0;
            }
            .display-4 {
                font-size: 2.2rem;
            }
            .stats-number {
                font-size: 2rem;
            }
        }