:root {
            --primary-color: #1a365d;
            --secondary-color: #e63946;
            --accent-color: #2a9d8f;
            --light-color: #f8f9fa;
            --dark-color: #343a40;
            --text-color: #333;
            --shadow: 0 5px 15px rgba(0,0,0,0.1);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            line-height: 1.7;
            overflow-x: hidden;
        }
        h1, h2, h3, h4, h5, h6 {
            font-weight: 700;
            color: var(--primary-color);
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .nav-link {
            font-weight: 600;
            padding: 0.5rem 1.2rem !important;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(26, 54, 93, 0.9), rgba(26, 54, 93, 0.8)), url('https://images.unsplash.com/photo-1551958219-acbc608c6377?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1770&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 8rem 0;
            position: relative;
        }
        .hero-section h1 {
            color: white;
            font-size: 3.5rem;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: white;
            font-size: 2rem;
            transition: var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: var(--secondary-color);
            transform: translateY(-10px);
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--secondary-color);
        }
        .service-card {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-15px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .service-card img {
            height: 220px;
            object-fit: cover;
            transition: var(--transition);
        }
        .service-card:hover img {
            transform: scale(1.05);
        }
        .prediction-card {
            border-left: 5px solid var(--secondary-color);
            background: var(--light-color);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            border-radius: 0 10px 10px 0;
        }
        .team-logo {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            object-fit: cover;
            border: 3px solid var(--primary-color);
        }
        .flink {
            display: inline-block;
            padding: 0.8rem 1.5rem;
            background: var(--light-color);
            border-radius: 50px;
            margin: 0.5rem;
            text-decoration: none;
            color: var(--dark-color);
            font-weight: 600;
            transition: var(--transition);
            border: 2px solid transparent;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
            transform: translateY(-5px);
        }
        .footer {
            background: var(--primary-color);
            color: white;
            padding: 4rem 0 2rem;
        }
        .footer a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
            transition: var(--transition);
        }
        .footer a:hover {
            color: white;
            padding-left: 5px;
        }
        .copyright {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 1.5rem;
            margin-top: 3rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 50px;
            height: 50px;
            background: var(--secondary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition);
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--primary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section {
                padding: 5rem 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }
        .article-content {
            text-align: justify;
            font-size: 1.05rem;
        }
        .article-content h3 {
            margin-top: 2rem;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        .article-content p {
            margin-bottom: 1.5rem;
        }
        .highlight-box {
            background: linear-gradient(to right, #f8f9fa, #e9ecef);
            border-left: 4px solid var(--accent-color);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 8px 8px 0;
        }
        .contact-info-box {
            background: var(--light-color);
            padding: 2rem;
            border-radius: 10px;
            box-shadow: var(--shadow);
            height: 100%;
        }
        .contact-icon {
            width: 50px;
            height: 50px;
            background: var(--primary-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.2rem;
            margin-bottom: 1rem;
        }
        .data-counter {
            font-size: 3rem;
            font-weight: 800;
            color: var(--secondary-color);
            line-height: 1;
        }