:root {
            --primary-color: #1e3a8a;
            --secondary-color: #dc2626;
            --accent-color: #fbbf24;
            --light-color: #f8fafc;
            --dark-color: #0f172a;
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.8;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 800;
            font-size: 1.8rem;
            color: var(--primary-color) !important;
        }
        .navbar-brand span {
            color: var(--secondary-color);
        }
        .nav-link {
            font-weight: 500;
            margin: 0 10px;
            transition: var(--transition);
        }
        .nav-link:hover {
            color: var(--secondary-color) !important;
            transform: translateY(-2px);
        }
        .hero-section {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1551958219-acbc608c6377?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
            color: white;
            padding: 150px 0;
            text-align: center;
        }
        .hero-section h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 20px;
            text-shadow: 2px 2px 5px rgba(0,0,0,0.5);
        }
        .hero-section p {
            font-size: 1.3rem;
            max-width: 800px;
            margin: 0 auto 30px;
        }
        .btn-primary-custom {
            background-color: var(--secondary-color);
            border: none;
            padding: 12px 30px;
            font-size: 1.1rem;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition);
        }
        .btn-primary-custom:hover {
            background-color: #b91c1c;
            transform: scale(1.05);
            box-shadow: 0 10px 20px rgba(220, 38, 38, 0.3);
        }
        .section-title {
            color: var(--primary-color);
            font-weight: 800;
            margin-bottom: 40px;
            position: relative;
            display: inline-block;
        }
        .section-title:after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 0;
            width: 60px;
            height: 4px;
            background-color: var(--accent-color);
        }
        .card-custom {
            border: none;
            border-radius: 15px;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            box-shadow: 0 5px 15px rgba(0,0,0,0.08);
        }
        .card-custom:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.15);
        }
        .card-custom img {
            height: 200px;
            object-fit: cover;
        }
        .icon-box {
            width: 70px;
            height: 70px;
            background-color: var(--primary-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 1.8rem;
            transition: var(--transition);
        }
        .feature-item:hover .icon-box {
            background-color: var(--secondary-color);
            transform: rotate(15deg);
        }
        .analysis-table {
            background-color: var(--light-color);
            border-radius: 10px;
            overflow: hidden;
        }
        .analysis-table th {
            background-color: var(--primary-color);
            color: white;
            font-weight: 600;
        }
        .friendlink {
            background-color: #f1f5f9;
            padding: 60px 0;
        }
        .flink {
            display: inline-block;
            background-color: white;
            color: var(--dark-color);
            padding: 12px 25px;
            margin: 10px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-5px);
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding-top: 60px;
        }
        footer a {
            color: #cbd5e1;
            text-decoration: none;
            transition: var(--transition);
        }
        footer a:hover {
            color: var(--accent-color);
        }
        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: #334155;
            color: white;
            border-radius: 50%;
            margin-right: 10px;
            transition: var(--transition);
        }
        .social-icons a:hover {
            background-color: var(--secondary-color);
            transform: scale(1.1);
        }
        @media (max-width: 768px) {
            .hero-section h1 {
                font-size: 2.5rem;
            }
            .hero-section p {
                font-size: 1.1rem;
            }
            .section-title {
                font-size: 1.8rem;
            }
        }