:root {
            --primary: #1a237e;
            --secondary: #ff5722;
            --accent: #00bcd4;
            --dark: #121858;
            --light: #f8f9fa;
            --gray: #6c757d;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            line-height: 1.7;
            color: #333;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .nav-link {
            font-weight: 600;
            transition: all 0.3s;
            padding: 0.5rem 1.2rem !important;
        }
        .nav-link:hover {
            color: var(--secondary) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(18, 24, 88, 0.85), rgba(26, 35, 126, 0.9)), url('https://images.unsplash.com/photo-1556056504-5c7696c4c28d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 10rem 0;
            position: relative;
        }
        .hero-title {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.3);
        }
        @media (max-width: 768px) {
            .hero-title { font-size: 2.5rem; }
        }
        .section-title {
            position: relative;
            padding-bottom: 1rem;
            margin-bottom: 3rem;
            font-weight: 700;
            color: var(--dark);
        }
        .section-title::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 2px;
        }
        .center-title::after {
            left: 50%;
            transform: translateX(-50%);
        }
        .feature-card {
            border: none;
            border-radius: 16px;
            overflow: hidden;
            transition: transform 0.4s, box-shadow 0.4s;
            height: 100%;
            background: white;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
        }
        .feature-card:hover {
            transform: translateY(-15px);
            box-shadow: 0 20px 40px rgba(26, 35, 126, 0.15);
        }
        .feature-icon {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 2rem auto;
            color: white;
            font-size: 2rem;
        }
        .stat-number {
            font-size: 3.5rem;
            font-weight: 800;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1;
        }
        .data-visual {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 20px;
            padding: 3rem;
            color: white;
            position: relative;
            overflow: hidden;
        }
        .data-visual::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 300px;
            height: 300px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
        }
        .btn-primary-custom {
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border: none;
            padding: 0.8rem 2.5rem;
            border-radius: 50px;
            font-weight: 600;
            transition: all 0.3s;
            color: white;
        }
        .btn-primary-custom:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(26, 35, 126, 0.3);
            color: white;
        }
        .news-card {
            border-radius: 12px;
            overflow: hidden;
            transition: all 0.3s;
            height: 100%;
            border: 1px solid #eee;
        }
        .news-card:hover {
            border-color: var(--accent);
            box-shadow: 0 15px 30px rgba(0, 188, 212, 0.1);
        }
        .news-date {
            position: absolute;
            top: 15px;
            left: 15px;
            background: var(--secondary);
            color: white;
            padding: 8px 15px;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 600;
        }
        .flink {
            display: inline-block;
            padding: 10px 25px;
            margin: 8px;
            background: #f8f9fa;
            border-radius: 50px;
            color: var(--dark);
            text-decoration: none;
            font-weight: 500;
            transition: all 0.3s;
            border: 1px solid #dee2e6;
        }
        .flink:hover {
            background: var(--primary);
            color: white;
            transform: translateY(-3px);
            border-color: var(--primary);
        }
        footer {
            background: var(--dark);
            color: #ccc;
            padding-top: 4rem;
        }
        footer a {
            color: #aaa;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .contact-info i {
            width: 40px;
            height: 40px;
            background: rgba(255,255,255,0.1);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            color: var(--accent);
        }
        .sticky-nav {
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(10px);
            box-shadow: 0 5px 20px rgba(0,0,0,0.08);
            transition: all 0.4s;
        }
        .prediction-badge {
            background: linear-gradient(90deg, #ff5722, #ff9800);
            color: white;
            padding: 5px 15px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            display: inline-block;
            margin-bottom: 10px;
        }
        .accuracy-meter {
            height: 10px;
            background: #e9ecef;
            border-radius: 5px;
            overflow: hidden;
            margin: 15px 0;
        }
        .accuracy-fill {
            height: 100%;
            background: linear-gradient(90deg, #00bcd4, #4caf50);
            border-radius: 5px;
            width: 87%;
        }