:root {
            --primary-color: #1a365d;
            --secondary-color: #c53030;
            --accent-color: #e2e8f0;
            --text-dark: #2d3748;
            --text-light: #718096;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-dark);
            line-height: 1.7;
            overflow-x: hidden;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1445205170230-053b83016050?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 180px 0 120px;
            position: relative;
        }
        .section-title {
            position: relative;
            padding-bottom: 20px;
            margin-bottom: 50px;
            text-align: center;
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
        }
        .section-title.text-white:after {
            background-color: white;
        }
        .nav-pills .nav-link {
            color: var(--text-dark);
            font-weight: 500;
            padding: 12px 24px;
            margin: 0 5px;
            border-radius: 30px;
            transition: var(--transition);
        }
        .nav-pills .nav-link:hover, .nav-pills .nav-link.active {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .card-hover {
            transition: var(--transition);
            border: none;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
            height: 100%;
        }
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 30px rgba(0,0,0,0.15);
        }
        .card-hover .card-img-top {
            height: 220px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card-hover:hover .card-img-top {
            transform: scale(1.05);
        }
        .btn-custom {
            background-color: var(--primary-color);
            color: white;
            padding: 12px 32px;
            border-radius: 30px;
            font-weight: 600;
            border: 2px solid var(--primary-color);
            transition: var(--transition);
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .btn-custom:hover {
            background-color: transparent;
            color: var(--primary-color);
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        }
        .btn-custom-secondary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
        }
        .btn-custom-secondary:hover {
            color: var(--secondary-color);
        }
        .icon-box {
            width: 80px;
            height: 80px;
            background-color: rgba(197, 48, 48, 0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 30px;
            transition: var(--transition);
        }
        .icon-box i {
            font-size: 36px;
            color: var(--secondary-color);
        }
        .feature-item:hover .icon-box {
            transform: rotateY(180deg);
            background-color: var(--secondary-color);
        }
        .feature-item:hover .icon-box i {
            color: white;
        }
        .testimonial-card {
            background-color: white;
            border-radius: 10px;
            padding: 30px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.08);
            margin-bottom: 30px;
            height: 100%;
            position: relative;
        }
        .testimonial-card:before {
            content: "\201C";
            font-size: 80px;
            color: var(--accent-color);
            position: absolute;
            top: -20px;
            left: 20px;
            font-family: Georgia, serif;
        }
        footer {
            background-color: #0f172a;
            color: #cbd5e1;
            padding-top: 80px;
        }
        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: white;
            padding-left: 8px;
        }
        .friendlink {
            background-color: rgba(255,255,255,0.05);
            padding: 20px;
            border-radius: 10px;
        }
        .flink {
            display: inline-block;
            background-color: rgba(255,255,255,0.08);
            color: #94a3b8;
            padding: 8px 20px;
            margin: 5px 10px 5px 0;
            border-radius: 30px;
            text-decoration: none;
            transition: var(--transition);
            border: 1px solid rgba(255,255,255,0.1);
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 120px 0 80px;
            }
            .display-4 {
                font-size: 2.5rem;
            }
        }