:root {
            --primary-color: #1e3a8a;
            --secondary-color: #dc2626;
            --accent-color: #fbbf24;
            --light-color: #f8fafc;
            --dark-color: #0f172a;
            --text-color: #334155;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: var(--text-color);
            background-color: #ffffff;
            line-height: 1.6;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-color);
        }
        .navbar-nav .nav-link {
            font-weight: 500;
            color: var(--dark-color);
            transition: color 0.3s ease;
        }
        .navbar-nav .nav-link:hover {
            color: var(--secondary-color);
        }
        .hero-section {
            background: linear-gradient(135deg, var(--primary-color) 0%, #2563eb 100%);
            color: white;
            padding: 5rem 0;
            text-align: center;
        }
        .hero-section h1 {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 1rem;
        }
        .hero-section .lead {
            font-size: 1.25rem;
            max-width: 800px;
            margin: 0 auto 2rem;
        }
        .section-title {
            font-size: 2.25rem;
            font-weight: 700;
            color: var(--primary-color);
            margin-bottom: 2rem;
            text-align: center;
            position: relative;
        }
        .section-title::after {
            content: '';
            display: block;
            width: 80px;
            height: 4px;
            background-color: var(--accent-color);
            margin: 0.5rem auto;
            border-radius: 2px;
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 25px rgba(0, 0, 0, 0.12);
        }
        .card-img-top {
            height: 200px;
            object-fit: cover;
        }
        .card-title {
            font-weight: 700;
            color: var(--dark-color);
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 0.75rem 2rem;
            font-weight: 600;
            border-radius: 8px;
            transition: background-color 0.3s ease;
        }
        .btn-primary:hover {
            background-color: var(--secondary-color);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
        }
        .stat-card {
            background: var(--light-color);
            padding: 2rem;
            border-radius: 12px;
            text-align: center;
            border-left: 5px solid var(--accent-color);
        }
        .stat-card i {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        .stat-card h3 {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--secondary-color);
        }
        .analysis-content {
            background: var(--light-color);
            padding: 3rem;
            border-radius: 12px;
            margin-bottom: 3rem;
        }
        .analysis-content h3 {
            color: var(--primary-color);
            margin-top: 2rem;
        }
        .friendlink {
            background: linear-gradient(to right, #f8fafc, #e2e8f0);
            padding: 3rem 0;
        }
        .flink {
            display: inline-block;
            margin: 0.5rem 1rem;
            padding: 0.75rem 1.5rem;
            background: white;
            border-radius: 8px;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }
        .flink:hover {
            background: var(--primary-color);
            color: white;
            transform: scale(1.05);
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 3rem 0 1.5rem;
        }
        footer a {
            color: var(--accent-color);
            text-decoration: none;
            transition: color 0.3s ease;
        }
        footer a:hover {
            color: white;
            text-decoration: underline;
        }
        .social-icons a {
            display: inline-block;
            margin: 0 0.5rem;
            font-size: 1.5rem;
            color: white;
            transition: color 0.3s ease;
        }
        .social-icons a:hover {
            color: var(--accent-color);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.25rem;
            }
            .section-title {
                font-size: 1.75rem;
            }
            .analysis-content {
                padding: 1.5rem;
            }
        }