:root {
            --primary-color: #1e3a8a;
            --secondary-color: #dc2626;
            --accent-color: #f59e0b;
            --light-bg: #f8fafc;
            --dark-bg: #0f172a;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-primary);
            line-height: 1.7;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--dark-bg) 100%);
            color: white;
            padding: 8rem 0;
            position: relative;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: rgba(245, 158, 11, 0.1);
            top: -100px;
            right: -100px;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(220, 38, 38, 0.1);
            bottom: -50px;
            left: -50px;
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
            border-radius: 2px;
        }
        .section-title.center::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-card {
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border: none;
            border-radius: 12px;
            overflow: hidden;
            height: 100%;
        }
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            font-size: 1.8rem;
        }
        .data-card {
            background: linear-gradient(145deg, #ffffff, #f1f5f9);
            border-radius: 15px;
            padding: 2rem;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
            height: 100%;
        }
        .data-card:hover {
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
            transform: translateY(-5px);
        }
        .prediction-badge {
            background: linear-gradient(90deg, var(--secondary-color), #ef4444);
            color: white;
            padding: 0.5rem 1.5rem;
            border-radius: 25px;
            font-weight: 600;
            display: inline-block;
        }
        .team-member {
            text-align: center;
            padding: 2rem 1rem;
            border-radius: 12px;
            transition: all 0.3s ease;
        }
        .team-member:hover {
            background: var(--light-bg);
            transform: scale(1.03);
        }
        .team-img {
            width: 150px;
            height: 150px;
            border-radius: 50%;
            object-fit: cover;
            border: 5px solid white;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            margin-bottom: 1.5rem;
        }
        .news-card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            transition: transform 0.3s ease;
            height: 100%;
        }
        .news-card:hover {
            transform: translateY(-8px);
        }
        .news-img {
            height: 200px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .news-card:hover .news-img {
            transform: scale(1.05);
        }
        .contact-info {
            padding: 2rem;
            border-radius: 12px;
            background: var(--light-bg);
            height: 100%;
        }
        .contact-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, var(--primary-color), #3b82f6);
            color: white;
        }
        .flink {
            display: inline-block;
            padding: 0.8rem 1.5rem;
            background: white;
            border-radius: 8px;
            margin: 0.5rem;
            text-decoration: none;
            color: var(--text-primary);
            border: 1px solid #e2e8f0;
            transition: all 0.3s ease;
            font-weight: 500;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: translateY(-3px);
            border-color: var(--primary-color);
        }
        .footer {
            background: var(--dark-bg);
            color: #cbd5e1;
            padding: 4rem 0 2rem;
        }
        .footer a {
            color: #cbd5e1;
            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;
            border-radius: 50%;
            background: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            text-decoration: none;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
            z-index: 1000;
        }
        .back-to-top.active {
            opacity: 1;
            visibility: visible;
        }
        .back-to-top:hover {
            background: var(--secondary-color);
            transform: translateY(-5px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 5rem 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
            .team-img {
                width: 120px;
                height: 120px;
            }
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .process-step {
            position: relative;
            padding-left: 3rem;
            margin-bottom: 2rem;
        }
        .process-step::before {
            content: attr(data-step);
            position: absolute;
            left: 0;
            top: 0;
            width: 2.5rem;
            height: 2.5rem;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-color), #3b82f6);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }
        .prediction-accuracy {
            font-size: 3rem;
            font-weight: 800;
            background: linear-gradient(90deg, #10b981, #34d399);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }