:root {
            --primary-color: #1a56db;
            --secondary-color: #0e9f6e;
            --dark-color: #1f2937;
            --light-color: #f9fafb;
            --gray-color: #6b7280;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            font-weight: 700;
            color: var(--dark-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            padding: 15px 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 800;
            color: var(--primary-color);
            font-size: 1.8rem;
        }
        .nav-link {
            font-weight: 600;
            color: var(--dark-color);
            margin: 0 8px;
            transition: color 0.3s;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(135deg, rgba(26, 86, 219, 0.05) 0%, rgba(14, 159, 110, 0.05) 100%);
            padding: 120px 0 80px;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(26, 86, 219, 0.1) 0%, transparent 70%);
            top: -200px;
            right: -200px;
            z-index: 0;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 25px;
            line-height: 1.2;
        }
        .section-title {
            font-size: 2.5rem;
            margin-bottom: 1.5rem;
            position: relative;
            display: inline-block;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 70px;
            height: 4px;
            background: var(--primary-color);
            bottom: -10px;
            left: 0;
            border-radius: 2px;
        }
        .section-title.center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .section-padding {
            padding: 100px 0;
        }
        .card {
            border: none;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.06);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
            border-radius: 12px;
            overflow: hidden;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background: linear-gradient(135deg, var(--primary-color), #3b82f6);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 25px;
        }
        .icon-box i {
            font-size: 30px;
            color: white;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #1e40af;
            border-color: #1e40af;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(26, 86, 219, 0.2);
        }
        .btn-outline-primary {
            color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            font-weight: 600;
            border-radius: 8px;
            transition: all 0.3s;
        }
        .btn-outline-primary:hover {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .feature-bg {
            background-color: #f8fafc;
            border-radius: 20px;
            padding: 60px;
        }
        .footer {
            background-color: var(--dark-color);
            color: #d1d5db;
            padding: 80px 0 30px;
        }
        .footer a {
            color: #d1d5db;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: white;
        }
        .footer-title {
            color: white;
            font-size: 1.3rem;
            margin-bottom: 25px;
            position: relative;
            padding-bottom: 10px;
        }
        .footer-title::after {
            content: '';
            position: absolute;
            width: 40px;
            height: 3px;
            background: var(--primary-color);
            bottom: 0;
            left: 0;
        }
        .copyright {
            border-top: 1px solid #374151;
            padding-top: 25px;
            margin-top: 50px;
            text-align: center;
            font-size: 0.9rem;
            color: #9ca3af;
        }
        .friendlink {
            background-color: #f3f4f6;
            padding: 50px 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            padding: 12px 25px;
            border-radius: 8px;
            margin: 0 10px 15px 0;
            color: var(--dark-color);
            text-decoration: none;
            font-weight: 500;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
            border: 1px solid #e5e7eb;
        }
        .flink:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.08);
            color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .contact-info {
            background: linear-gradient(135deg, var(--primary-color) 0%, #3b82f6 100%);
            color: white;
            padding: 60px 40px;
            border-radius: 20px;
        }
        .contact-info i {
            font-size: 2rem;
            margin-bottom: 20px;
            color: rgba(255, 255, 255, 0.9);
        }
        .stats-box {
            text-align: center;
            padding: 30px 20px;
            background-color: white;
            border-radius: 12px;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.06);
        }
        .stats-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--primary-color);
            line-height: 1;
            margin-bottom: 10px;
        }
        @media (max-width: 768px) {
            .hero-title {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 60px 0;
            }
            .section-title {
                font-size: 2rem;
            }
            .feature-bg {
                padding: 30px;
            }
        }
        .timeline {
            position: relative;
            max-width: 1200px;
            margin: 0 auto;
        }
        .timeline::after {
            content: '';
            position: absolute;
            width: 6px;
            background-color: var(--primary-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -3px;
            border-radius: 3px;
        }
        .timeline-item {
            padding: 10px 40px;
            position: relative;
            width: 50%;
            box-sizing: border-box;
        }
        .timeline-item:nth-child(odd) {
            left: 0;
        }
        .timeline-item:nth-child(even) {
            left: 50%;
        }
        .timeline-content {
            padding: 20px 30px;
            background-color: white;
            position: relative;
            border-radius: 12px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }
        .timeline-item:nth-child(odd) .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            right: -10px;
            background-color: white;
            top: 30px;
            transform: rotate(45deg);
            box-shadow: 3px -3px 5px rgba(0, 0, 0, 0.05);
        }
        .timeline-item:nth-child(even) .timeline-content::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            left: -10px;
            background-color: white;
            top: 30px;
            transform: rotate(45deg);
            box-shadow: -3px 3px 5px rgba(0, 0, 0, 0.05);
        }
        .timeline-date {
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 10px;
        }
        @media (max-width: 768px) {
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item:nth-child(even) {
                left: 0;
            }
            .timeline-item:nth-child(odd) .timeline-content::after,
            .timeline-item:nth-child(even) .timeline-content::after {
                left: -10px;
                right: auto;
            }
        }