:root {
            --primary-color: #1a365d;
            --secondary-color: #d4af37;
            --accent-color: #2d3748;
            --light-color: #f8f9fa;
            --dark-color: #212529;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', sans-serif;
            color: var(--dark-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5 {
            color: var(--primary-color);
            font-weight: 700;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 600;
            color: var(--primary-color) !important;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.85), rgba(26, 54, 93, 0.9)), url('https://images.unsplash.com/photo-1581094794329-c8112a89af12?ixlib=rb-4.0.3&auto=format&fit=crop&w=2070&q=80') no-repeat center center/cover;
            color: white;
            padding: 120px 0;
            text-align: center;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 20px;
        }
        .hero-section p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 30px;
        }
        .btn-primary {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            padding: 12px 30px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: #b8941f;
            border-color: #b8941f;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        .section-title {
            text-align: center;
            margin-bottom: 60px;
            position: relative;
        }
        .section-title:after {
            content: '';
            position: absolute;
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
        }
        .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: 0 15px 30px rgba(0,0,0,0.1);
        }
        .card-img-top {
            height: 220px;
            object-fit: cover;
        }
        .icon-box {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }
        .feature-box {
            padding: 30px;
            text-align: center;
            background: var(--light-color);
            border-radius: 10px;
            height: 100%;
            transition: background 0.3s;
        }
        .feature-box:hover {
            background: #e9ecef;
        }
        .contact-info i {
            color: var(--secondary-color);
            font-size: 1.5rem;
            margin-right: 15px;
        }
        .contact-info a {
            color: var(--dark-color);
            text-decoration: none;
            transition: color 0.3s;
        }
        .contact-info a:hover {
            color: var(--secondary-color);
        }
        footer {
            background-color: var(--primary-color);
            color: white;
            padding: 60px 0 20px;
        }
        footer a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: var(--secondary-color);
        }
        .flink {
            display: inline-block;
            padding: 8px 15px;
            margin: 5px;
            background: rgba(255,255,255,0.1);
            border-radius: 5px;
            color: #ccc;
            transition: all 0.3s;
            text-decoration: none;
        }
        .flink:hover {
            background: var(--secondary-color);
            color: var(--primary-color);
            transform: scale(1.05);
        }
        .friendlinks {
            background: var(--accent-color);
            padding: 30px 0;
            text-align: center;
        }
        .friendlinks h3 {
            color: white;
            margin-bottom: 20px;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--secondary-color);
            color: var(--primary-color);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            text-decoration: none;
            z-index: 1000;
            opacity: 0;
            transition: opacity 0.3s, transform 0.3s;
        }
        .back-to-top.show {
            opacity: 1;
        }
        .back-to-top:hover {
            transform: scale(1.1);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 80px 0;
            }
            .section-title {
                margin-bottom: 40px;
            }
        }