* {
            box-sizing: border-box;
        }
        body {
            font-family: 'Microsoft YaHei', SimHei, sans-serif;
            color: #333;
            overflow-x: hidden;
        }
        .hero-gradient {
            background: linear-gradient(135deg, rgba(13, 71, 161, 0.85) 0%, rgba(33, 150, 243, 0.8) 100%);
        }
        .nav-shadow {
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }
        .section-padding {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        .card-hover {
            transition: all 0.3s ease-in-out;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .img-zoom {
            transition: transform 0.5s ease;
        }
        .img-zoom:hover {
            transform: scale(1.05);
        }
        .flink {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            margin: 5px;
            background-color: #f8f9fa;
            border-radius: 50px;
            color: #555;
            text-decoration: none;
            border: 1px solid #dee2e6;
            transition: all 0.3s;
        }
        .flink:hover {
            background-color: #e9ecef;
            color: #0d47a1;
            border-color: #0d47a1;
            transform: translateY(-2px);
        }
        .btn-primary-custom {
            background-color: #0d47a1;
            border-color: #0d47a1;
            padding: 12px 28px;
            font-weight: 600;
            border-radius: 50px;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background-color: #08367d;
            border-color: #08367d;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(13, 71, 161, 0.2);
        }
        .sticky-nav {
            position: sticky;
            top: 0;
            z-index: 1020;
            backdrop-filter: blur(10px);
            background-color: rgba(255, 255, 255, 0.95);
        }
        @media (max-width: 768px) {
            .section-padding {
                padding-top: 3rem;
                padding-bottom: 3rem;
            }
            .display-4 {
                font-size: 2.5rem;
            }
        }