:root {
            --primary-color: #1a56db;
            --secondary-color: #046c4e;
            --accent-color: #f3f4f6;
            --text-dark: #1f2937;
            --text-light: #6b7280;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            font-weight: 700;
            margin-bottom: 1rem;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow);
            padding: 1rem 0;
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--text-dark);
            margin: 0 0.5rem;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--primary-color);
        }
        .hero {
            background: linear-gradient(135deg, #1a56db 0%, #3b82f6 100%);
            color: white;
            padding: 6rem 0;
            position: relative;
            overflow: hidden;
        }
        .hero h1 {
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
        }
        .hero p {
            font-size: 1.2rem;
            margin-bottom: 2rem;
        }
        .section {
            padding: 5rem 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
        }
        .section-title::after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--primary-color);
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 12px;
            box-shadow: var(--shadow);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 20px rgba(0, 0, 0, 0.15);
        }
        .card-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            transition: background-color 0.3s, transform 0.3s;
        }
        .btn-primary:hover {
            background-color: #1e40af;
            transform: scale(1.05);
        }
        .btn-outline-primary {
            color: var(--primary-color);
            border-color: var(--primary-color);
            border-radius: 50px;
            padding: 0.8rem 2rem;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-outline-primary:hover {
            background-color: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        .flink {
            display: inline-block;
            padding: 0.5rem 1rem;
            margin: 0.5rem;
            background-color: var(--accent-color);
            border-radius: 8px;
            color: var(--text-dark);
            text-decoration: none;
            transition: all 0.3s;
            font-weight: 500;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: #111827;
            color: #d1d5db;
            padding: 4rem 0 2rem;
        }
        footer a {
            color: #9ca3af;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
        }
        .social-icons a {
            display: inline-block;
            width: 40px;
            height: 40px;
            background-color: #374151;
            border-radius: 50%;
            text-align: center;
            line-height: 40px;
            margin-right: 10px;
            transition: background-color 0.3s;
        }
        .social-icons a:hover {
            background-color: var(--primary-color);
        }
        .img-hover {
            transition: transform 0.5s;
            border-radius: 12px;
            overflow: hidden;
        }
        .img-hover:hover {
            transform: scale(1.03);
        }
        @media (max-width: 768px) {
            .hero h1 {
                font-size: 2.5rem;
            }
            .section {
                padding: 3rem 0;
            }
        }