:root {
            --primary-color: #1a237e;
            --secondary-color: #3949ab;
            --accent-color: #00acc1;
            --light-color: #f5f7ff;
            --dark-color: #0d1533;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            color: white;
            padding: 6rem 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" preserveAspectRatio="none"><path d="M0,0 L100,0 100,100 Z" fill="rgba(255,255,255,0.05)"/></svg>');
            background-size: cover;
        }
        .service-card {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            border-radius: 12px;
            overflow: hidden;
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .service-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
            color: var(--accent-color);
        }
        .portfolio-item {
            position: relative;
            overflow: hidden;
            border-radius: 10px;
        }
        .portfolio-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(26, 35, 126, 0.85);
            color: white;
            opacity: 0;
            transition: opacity 0.3s ease;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            padding: 20px;
            text-align: center;
        }
        .portfolio-item:hover .portfolio-overlay {
            opacity: 1;
        }
        .testimonial-card {
            background: var(--light-color);
            border-left: 5px solid var(--accent-color);
            padding: 2rem;
            border-radius: 8px;
            margin-bottom: 2rem;
        }
        .testimonial-author {
            display: flex;
            align-items: center;
            margin-top: 1.5rem;
        }
        .testimonial-author img {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            margin-right: 15px;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px 10px;
            background: #f8f9fa;
            border: 1px solid #dee2e6;
            border-radius: 50px;
            color: #495057;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: scale(1.05);
        }
        .footer {
            background: var(--dark-color);
            color: white;
            padding: 4rem 0 2rem;
        }
        .footer a {
            color: #b0b7d8;
            text-decoration: none;
            transition: color 0.3s ease;
        }
        .footer a:hover {
            color: white;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--accent-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            opacity: 0;
            transition: opacity 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.visible {
            opacity: 1;
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 4rem 0;
            }
            .display-4 {
                font-size: 2.5rem;
            }
        }
        .stats-section {
            background: var(--light-color);
            padding: 4rem 0;
        }
        .stat-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        .blog-card {
            border: none;
            border-radius: 10px;
            overflow: hidden;
            transition: transform 0.3s ease;
            height: 100%;
        }
        .blog-card:hover {
            transform: translateY(-5px);
        }
        .blog-card img {
            height: 200px;
            object-fit: cover;
        }
        .form-control:focus {
            border-color: var(--accent-color);
            box-shadow: 0 0 0 0.25rem rgba(0, 172, 193, 0.25);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border-color: var(--primary-color);
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
            border-color: var(--secondary-color);
        }
        .btn-accent {
            background-color: var(--accent-color);
            border-color: var(--accent-color);
            color: white;
        }
        .btn-accent:hover {
            background-color: #0097a7;
            border-color: #0097a7;
            color: white;
        }