:root {
            --primary-blue: #0066CC;
            --secondary-blue: #0088FF;
            --dark-blue: #004C99;
            --light-blue: #E6F2FF;
            --accent-orange: #FF6600;
            --dark-gray: #333333;
            --medium-gray: #666666;
            --light-gray: #F5F5F5;
            --white: #FFFFFF;
        }
        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            color: var(--dark-gray);
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-blue) !important;
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1.2rem !important;
            transition: all 0.3s ease;
        }
        .navbar-nav .nav-link:hover {
            color: var(--accent-orange) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
            color: var(--white);
            padding: 8rem 0 6rem;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600" opacity="0.1"><path d="M0,300 C300,150 600,450 1200,300 L1200,600 L0,600 Z" fill="white"/></svg>');
            background-size: cover;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 1.5rem;
            text-shadow: 0 2px 10px rgba(0,0,0,0.2);
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            font-weight: 700;
            color: var(--dark-blue);
        }
        .section-title::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 4px;
            background: var(--accent-orange);
            border-radius: 2px;
        }
        .card-hover {
            transition: all 0.3s ease;
            border: none;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: var(--light-blue);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
        }
        .icon-box i {
            font-size: 1.8rem;
            color: var(--primary-blue);
        }
        .solution-item {
            background: var(--white);
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            height: 100%;
            border-left: 4px solid var(--primary-blue);
        }
        .solution-item:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            border-left-color: var(--accent-orange);
        }
        .client-logo {
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1rem;
            background: var(--white);
            border-radius: 8px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }
        .client-logo:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.1);
        }
        .flink {
            display: inline-block;
            padding: 0.5rem 1.5rem;
            margin: 0.5rem;
            background: var(--light-gray);
            border-radius: 30px;
            color: var(--dark-gray);
            text-decoration: none;
            transition: all 0.3s ease;
            border: 1px solid #e0e0e0;
        }
        .flink:hover {
            background: var(--primary-blue);
            color: var(--white);
            transform: translateY(-3px);
        }
        .footer {
            background: #1a2b3c;
            color: var(--white);
            padding-top: 4rem;
        }
        .footer-links a {
            color: #CCCCCC;
            text-decoration: none;
            transition: color 0.3s ease;
            display: block;
            margin-bottom: 0.5rem;
        }
        .footer-links a:hover {
            color: var(--white);
            padding-left: 5px;
        }
        .copyright {
            background: #0d1824;
            padding: 1.5rem 0;
            margin-top: 3rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-blue);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.show {
            opacity: 1;
        }
        .back-to-top:hover {
            background: var(--accent-orange);
            transform: translateY(-5px);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-blue);
            line-height: 1;
        }
        .contact-info-box {
            background: var(--light-blue);
            padding: 2rem;
            border-radius: 10px;
            border-left: 4px solid var(--primary-blue);
        }
        .btn-primary-custom {
            background: var(--primary-blue);
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 30px;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        .btn-primary-custom:hover {
            background: var(--dark-blue);
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,102,204,0.3);
        }
        .timeline {
            position: relative;
            padding-left: 2rem;
        }
        .timeline::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 3px;
            background: var(--primary-blue);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2.5rem;
        }
        .timeline-item::before {
            content: "";
            position: absolute;
            left: -2.4rem;
            top: 0.3rem;
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background: var(--accent-orange);
            border: 3px solid var(--white);
            box-shadow: 0 0 0 3px var(--primary-blue);
        }
        .img-placeholder {
            background: linear-gradient(45deg, #f0f0f0, #e0e0e0);
            height: 100%;
            min-height: 200px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--medium-gray);
            border-radius: 8px;
        }