:root {
            --primary-color: #1a56db;
            --secondary-color: #0e9f6e;
            --dark-color: #1f2937;
            --light-color: #f9fafb;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-color);
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-color);
        }
        .hero-section {
            background: linear-gradient(135deg, #1a56db 0%, #0e9f6e 100%);
            color: white;
            padding: 6rem 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
            font-weight: 700;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 4px;
            background: var(--secondary-color);
        }
        .card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 0.75rem 2rem;
            border-radius: 5px;
            transition: background-color 0.3s;
        }
        .btn-primary:hover {
            background-color: #1546b8;
        }
        .footer {
            background-color: var(--dark-color);
            color: var(--light-color);
            padding: 3rem 0 1.5rem;
        }
        .flink {
            display: inline-block;
            margin: 0.5rem 1rem;
            padding: 0.5rem 1rem;
            background: #f1f5f9;
            border-radius: 5px;
            color: var(--dark-color);
            text-decoration: none;
            transition: all 0.3s;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
        }
        .friendlink {
            background-color: #f8fafc;
            padding: 4rem 0;
        }
        .img-hover {
            transition: transform 0.5s;
        }
        .img-hover:hover {
            transform: scale(1.05);
        }
        .contact-info i {
            width: 40px;
            height: 40px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-right: 10px;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 4rem 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }