:root {
            --primary-color: #1a73e8;
            --secondary-color: #34a853;
            --accent-color: #fbbc04;
            --dark-color: #202124;
            --light-color: #f8f9fa;
            --gray-color: #5f6368;
        }
        body {
            font-family: 'Microsoft YaHei', 'PingFang SC', sans-serif;
            color: var(--dark-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand i {
            color: var(--secondary-color);
            margin-right: 8px;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, #6c8ef5 100%);
            color: white;
            padding: 120px 0 100px;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            width: 300px;
            height: 300px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            top: -150px;
            right: -100px;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            width: 200px;
            height: 200px;
            background: rgba(255,255,255,0.05);
            border-radius: 50%;
            bottom: -100px;
            left: -50px;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 800;
            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 {
            font-weight: 700;
            color: var(--dark-color);
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 4px;
            background: var(--primary-color);
            border-radius: 2px;
        }
        .section-title.text-center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 5px 20px rgba(0,0,0,0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            background: rgba(26, 115, 232, 0.1);
            color: var(--primary-color);
            font-size: 1.8rem;
        }
        .stats-section {
            background-color: var(--light-color);
            padding: 80px 0;
        }
        .stat-item h3 {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        .service-card {
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: all 0.3s ease;
            border: 1px solid #eee;
        }
        .service-card:hover {
            border-color: var(--primary-color);
            box-shadow: 0 10px 25px rgba(26, 115, 232, 0.15);
        }
        .service-card img {
            height: 200px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .service-card:hover img {
            transform: scale(1.05);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s ease;
        }
        .btn-primary:hover {
            background-color: #0d62d9;
            border-color: #0d62d9;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(26, 115, 232, 0.3);
        }
        footer {
            background-color: var(--dark-color);
            color: #e8eaed;
        }
        footer a {
            color: #e8eaed;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        footer a:hover {
            color: var(--primary-color);
        }
        .flink {
            display: inline-block;
            padding: 8px 16px;
            margin: 5px;
            background: rgba(255,255,255,0.1);
            border-radius: 6px;
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: rgba(255,255,255,0.2);
            transform: translateY(-3px);
        }
        .contact-info i {
            width: 40px;
            color: var(--primary-color);
        }
        .timeline {
            position: relative;
            padding-left: 30px;
        }
        .timeline::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 2px;
            background: var(--primary-color);
        }
        .timeline-item {
            position: relative;
            margin-bottom: 2rem;
        }
        .timeline-item::before {
            content: '';
            position: absolute;
            left: -34px;
            top: 5px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--primary-color);
            border: 3px solid white;
            box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.3);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 1000;
            box-shadow: 0 3px 10px rgba(0,0,0,0.2);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: #0d62d9;
            transform: translateY(-3px);
        }
        .partner-logo {
            filter: grayscale(100%);
            opacity: 0.7;
            transition: all 0.3s ease;
        }
        .partner-logo:hover {
            filter: grayscale(0);
            opacity: 1;
        }
        .navbar {
            padding-top: 1rem;
            padding-bottom: 1rem;
            transition: all 0.3s ease;
            box-shadow: 0 2px 15px rgba(0,0,0,0.1);
        }
        .navbar.scrolled {
            padding-top: 0.5rem;
            padding-bottom: 0.5rem;
            background-color: rgba(255, 255, 255, 0.98) !important;
        }