:root {
            --primary-color: #1a237e;
            --secondary-color: #283593;
            --accent-color: #5c6bc0;
            --light-bg: #f5f7ff;
            --dark-text: #212529;
            --light-text: #6c757d;
            --border-color: #e0e0e0;
            --success-color: #4caf50;
            --warning-color: #ff9800;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--dark-text);
            line-height: 1.7;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.8rem;
            color: var(--primary-color);
        }
        .nav-link {
            font-weight: 500;
            transition: color 0.3s;
        }
        .nav-link:hover {
            color: var(--accent-color);
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
            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;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.05)" d="M0,96L48,112C96,128,192,160,288,160C384,160,480,128,576,122.7C672,117,768,139,864,154.7C960,171,1056,181,1152,165.3C1248,149,1344,107,1392,85.3L1440,64L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom center;
            background-size: cover;
        }
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 3rem;
            font-weight: 700;
            color: var(--primary-color);
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background: var(--accent-color);
        }
        .feature-icon {
            width: 70px;
            height: 70px;
            background: var(--light-bg);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            font-size: 1.8rem;
            color: var(--primary-color);
            transition: all 0.3s ease;
        }
        .feature-card:hover .feature-icon {
            background: var(--primary-color);
            color: white;
            transform: translateY(-5px);
        }
        .data-card {
            border-left: 4px solid var(--accent-color);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .data-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        }
        .pricing-card {
            border: 1px solid var(--border-color);
            border-radius: 10px;
            transition: all 0.3s;
            overflow: hidden;
        }
        .pricing-card.popular {
            border-color: var(--accent-color);
            box-shadow: 0 5px 15px rgba(92, 107, 192, 0.2);
            transform: scale(1.03);
        }
        .pricing-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.1);
        }
        .pricing-header {
            background: var(--light-bg);
            padding: 2rem;
            text-align: center;
        }
        .flink {
            display: inline-block;
            padding: 8px 20px;
            margin: 5px;
            background: var(--light-bg);
            border-radius: 30px;
            color: var(--dark-text);
            text-decoration: none;
            transition: all 0.3s;
            border: 1px solid transparent;
        }
        .flink:hover {
            background: white;
            border-color: var(--accent-color);
            color: var(--accent-color);
            transform: translateY(-3px);
        }
        .footer {
            background: #1a1a2e;
            color: #b0b0b0;
        }
        .footer a {
            color: #b0b0b0;
            text-decoration: none;
            transition: color 0.3s;
        }
        .footer a:hover {
            color: white;
        }
        .chart-container {
            height: 300px;
            width: 100%;
            position: relative;
        }
        .news-card {
            border-bottom: 1px solid var(--border-color);
            padding-bottom: 1.5rem;
            margin-bottom: 1.5rem;
            transition: background-color 0.3s;
        }
        .news-card:hover {
            background-color: rgba(245, 247, 255, 0.5);
        }
        .btn-primary-custom {
            background: var(--primary-color);
            border-color: var(--primary-color);
            padding: 0.75rem 2rem;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-primary-custom:hover {
            background: var(--secondary-color);
            border-color: var(--secondary-color);
            transform: translateY(-2px);
        }
        @media (max-width: 768px) {
            .hero-section {
                padding: 4rem 0;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }