:root {
            --primary-color: #1e3a8a;
            --secondary-color: #dc2626;
            --accent-color: #f59e0b;
            --light-bg: #f8fafc;
            --dark-text: #1f2937;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            line-height: 1.8;
            overflow-x: hidden;
        }
        h1, h2, h3, h4 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar {
            background-color: rgba(255, 255, 255, 0.95);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            transition: all 0.3s ease;
        }
        .navbar-brand {
            font-weight: 800;
            color: var(--primary-color);
            font-size: 1.8rem;
        }
        .nav-link {
            font-weight: 500;
            color: var(--dark-text);
            margin: 0 8px;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--secondary-color);
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, #2563eb 100%);
            color: white;
            padding: 120px 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
        }
        .hero-section .lead {
            font-size: 1.25rem;
            opacity: 0.9;
        }
        .section-padding {
            padding: 80px 0;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 40px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 12px;
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
        }
        .card-icon {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 20px;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
            padding: 12px 30px;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: scale(1.05);
        }
        .feature-img {
            border-radius: 12px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
        }
        .testimonial-item {
            background: var(--light-bg);
            border-left: 4px solid var(--accent-color);
            padding: 25px;
            border-radius: 0 12px 12px 0;
        }
        .friendlink {
            background-color: #f1f5f9;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background: white;
            padding: 12px 24px;
            margin: 10px;
            border-radius: 8px;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.05);
            transition: all 0.3s;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: #1e293b;
            color: #cbd5e1;
        }
        footer a {
            color: #cbd5e1;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
            margin-right: 10px;
            transition: all 0.3s;
        }
        .social-icons a:hover {
            background: var(--secondary-color);
            transform: rotate(10deg);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .section-padding {
                padding: 60px 0;
            }
        }
        .content-text {
            font-size: 1.1rem;
            text-align: justify;
        }