:root {
            --primary-color: #0d6efd;
            --secondary-color: #6c757d;
            --accent-color: #198754;
            --light-bg: #f8f9fa;
            --dark-bg: #212529;
            --text-color: #333;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: var(--text-color);
            line-height: 1.6;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            margin-bottom: 1rem;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1030;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: bold;
            color: var(--primary-color);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            padding: 0.5rem 1rem;
            border-radius: 0.25rem;
        }
        .navbar-nav .nav-link:hover, .navbar-nav .nav-link.active {
            background-color: var(--primary-color);
            color: white;
        }
        .hero {
            background: linear-gradient(rgba(13, 110, 253, 0.85), rgba(25, 135, 84, 0.85)), url('https://images.unsplash.com/photo-1551288049-bebda4e38f71?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') center/cover no-repeat;
            color: white;
            padding: 8rem 0;
            text-align: center;
        }
        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .hero p {
            font-size: 1.25rem;
            max-width: 800px;
            margin: 0 auto 2rem;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition);
        }
        .btn-primary:hover {
            background-color: #0b5ed7;
            transform: translateY(-3px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        .section {
            padding: 5rem 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 60px;
            height: 4px;
            background-color: var(--accent-color);
            margin: 1rem auto;
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            transition: var(--transition);
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 40px rgba(0,0,0,0.15);
        }
        .card-img-top {
            height: 200px;
            object-fit: cover;
        }
        .card-body {
            padding: 2rem;
        }
        .icon-box {
            font-size: 3rem;
            color: var(--primary-color);
            margin-bottom: 1.5rem;
        }
        .feature-item {
            text-align: center;
            padding: 2rem;
            background: var(--light-bg);
            border-radius: 15px;
            transition: var(--transition);
        }
        .feature-item:hover {
            background: var(--primary-color);
            color: white;
        }
        .feature-item:hover .icon-box {
            color: white;
        }
        .process-step {
            display: flex;
            align-items: center;
            margin-bottom: 2rem;
            padding: 1.5rem;
            background: white;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        .step-number {
            background-color: var(--accent-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: bold;
            margin-right: 1.5rem;
            flex-shrink: 0;
        }
        .testimonial {
            background-color: var(--light-bg);
            padding: 2rem;
            border-radius: 15px;
            margin-bottom: 2rem;
            border-left: 5px solid var(--primary-color);
        }
        .testimonial-author {
            display: flex;
            align-items: center;
            margin-top: 1.5rem;
        }
        .testimonial-author img {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            margin-right: 1rem;
        }
        .friendlink {
            background-color: #f1f3f5;
            padding: 3rem 0;
        }
        .flink {
            display: inline-block;
            margin: 0.5rem 1rem;
            padding: 0.5rem 1.5rem;
            background: white;
            border-radius: 30px;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
            transition: var(--transition);
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        footer {
            background-color: var(--dark-bg);
            color: white;
            padding: 3rem 0 1.5rem;
        }
        footer a {
            color: #adb5bd;
        }
        footer a:hover {
            color: white;
        }
        .social-icons a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background-color: rgba(255,255,255,0.1);
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin-right: 0.5rem;
        }
        .social-icons a:hover {
            background-color: var(--primary-color);
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .section {
                padding: 3rem 0;
            }
            .process-step {
                flex-direction: column;
                text-align: center;
            }
            .step-number {
                margin-right: 0;
                margin-bottom: 1rem;
            }
        }