:root {
            --primary-color: #1e3a8a;
            --secondary-color: #0ea5e9;
            --accent-color: #10b981;
            --dark-color: #0f172a;
            --light-color: #f8fafc;
            --text-color: #334155;
            --border-radius: 8px;
            --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Microsoft YaHei', 'Segoe UI', Arial, sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--dark-color);
            margin-bottom: 1rem;
        }
        .section-header {
            text-align: center;
            margin-bottom: 3.5rem;
        }
        .section-header h2 {
            font-size: 2.5rem;
            position: relative;
            display: inline-block;
            padding-bottom: 15px;
        }
        .section-header h2::after {
            content: '';
            position: absolute;
            width: 70px;
            height: 4px;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            border-radius: 2px;
        }
        .section-header p {
            font-size: 1.1rem;
            color: #64748b;
            max-width: 700px;
            margin: 0 auto;
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
            padding: 0.8rem 0;
            transition: var(--transition);
        }
        .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;
            margin: 0 8px;
            color: var(--dark-color) !important;
            transition: var(--transition);
            position: relative;
        }
        .nav-link:hover, .nav-link.active {
            color: var(--secondary-color) !important;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            background: var(--secondary-color);
            bottom: 0;
            left: 0;
            transition: width 0.3s ease;
        }
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, #2563eb 100%);
            color: white;
            padding: 7rem 0 5rem;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            background: url('https://images.unsplash.com/photo-1575361204480-aadea25e6e68?ixlib=rb-4.0.3&auto=format&fit=crop&w=1200&q=80') center/cover no-repeat;
            opacity: 0.1;
            top: 0;
            left: 0;
        }
        .hero-content h1 {
            font-size: 3.2rem;
            color: white;
            margin-bottom: 1.5rem;
            line-height: 1.2;
        }
        .hero-content p {
            font-size: 1.3rem;
            margin-bottom: 2rem;
            opacity: 0.9;
        }
        .btn-primary-custom {
            background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
            color: white;
            border: none;
            padding: 12px 32px;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3);
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(14, 165, 233, 0.4);
            color: white;
        }
        .feature-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 2.5rem 2rem;
            height: 100%;
            transition: var(--transition);
            border: 1px solid #e2e8f0;
            text-align: center;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--box-shadow);
            border-color: var(--secondary-color);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
        }
        .comparison-table {
            background: white;
            border-radius: var(--border-radius);
            overflow: hidden;
            box-shadow: var(--box-shadow);
        }
        .comparison-table thead th {
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            color: white;
            font-weight: 600;
            padding: 1.2rem;
            text-align: center;
            border: none;
        }
        .comparison-table tbody tr:nth-child(even) {
            background-color: #f8fafc;
        }
        .comparison-table tbody td {
            padding: 1.2rem;
            vertical-align: middle;
            border-color: #e2e8f0;
        }
        .rating-stars {
            color: #fbbf24;
        }
        .badge-success-custom {
            background-color: rgba(16, 185, 129, 0.15);
            color: var(--accent-color);
            font-weight: 600;
            padding: 6px 12px;
            border-radius: 20px;
        }
        .article-card {
            border-radius: var(--border-radius);
            overflow: hidden;
            background: white;
            box-shadow: var(--box-shadow);
            height: 100%;
            transition: var(--transition);
        }
        .article-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 25px rgba(0, 0, 0, 0.12);
        }
        .article-img {
            height: 220px;
            overflow: hidden;
        }
        .article-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .article-card:hover .article-img img {
            transform: scale(1.05);
        }
        .article-content {
            padding: 1.8rem;
        }
        .article-meta {
            display: flex;
            justify-content: space-between;
            margin-bottom: 1rem;
            font-size: 0.9rem;
            color: #64748b;
        }
        .friendlink {
            background-color: #f8fafc;
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 25px;
            margin: 8px;
            border-radius: var(--border-radius);
            color: var(--text-color);
            text-decoration: none;
            font-weight: 500;
            border: 1px solid #e2e8f0;
            transition: var(--transition);
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-3px);
        }
        .footer {
            background: var(--dark-color);
            color: #cbd5e1;
            padding: 4rem 0 2rem;
        }
        .footer h5 {
            color: white;
            margin-bottom: 1.5rem;
            font-size: 1.2rem;
        }
        .footer-links a {
            color: #94a3b8;
            text-decoration: none;
            display: block;
            margin-bottom: 10px;
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary-color);
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid #334155;
            padding-top: 1.5rem;
            margin-top: 3rem;
            text-align: center;
            color: #94a3b8;
            font-size: 0.9rem;
        }
        .contact-info i {
            color: var(--secondary-color);
            width: 24px;
            margin-right: 10px;
        }
        @media (max-width: 992px) {
            .hero-content h1 {
                font-size: 2.5rem;
            }
            .section-header h2 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 5rem 0 3rem;
            }
            .hero-content h1 {
                font-size: 2rem;
            }
            .section-header h2 {
                font-size: 1.8rem;
            }
            .comparison-table {
                font-size: 0.9rem;
            }
        }
        .fade-in {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-in.visible {
            opacity: 1;
            transform: translateY(0);
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            cursor: pointer;
            z-index: 999;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }
        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-3px);
        }