* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
            line-height: 1.7;
            color: #333;
            background: #f5f7fa;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
        }

        header {
            background: linear-gradient(135deg, #0B2447 0%, #0099cc 100%);
            color: white;
            padding: 50px 20px;
            text-align: center;
        }

        header h1 {
            font-size: 2.5rem;
            margin-bottom: 15px;
            font-weight: 600;
        }

        header p {
            font-size: 1.1rem;
            opacity: 0.95;
            max-width: 700px;
            margin: 0 auto;
        }

        .nav-bar {
            background: #fff;
            box-shadow: 0 2px 10px rgba(0,0,0,0.08);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .nav-bar ul {
            list-style: none;
            display: flex;
            justify-content: center;
            gap: 40px;
            padding: 15px 0;
        }

        .nav-bar a {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            transition: color 0.3s;
        }

        .nav-bar a:hover {
            color: #0066cc;
        }

        .card {
            background: white;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.06);
            margin-bottom: 30px;
            overflow: hidden;
        }

        .card-header {
            background: linear-gradient(135deg, #f8fafc 0%, #e8f4fc 100%);
            padding: 25px 30px;
            border-bottom: 1px solid #eee;
        }

        .card-header h2 {
            font-size: 1.6rem;
            color: #1a365d;
            font-weight: 600;
        }

        .card-body {
            padding: 30px;
        }

        .card-body p {
            color: #555;
            margin-bottom: 18px;
            text-align: justify;
        }

        .card-body h3 {
            font-size: 1.25rem;
            color: #2c3e50;
            margin: 25px 0 15px;
            padding-left: 12px;
            border-left: 3px solid #0066cc;
        }

        .card-body ul {
            list-style: none;
            padding-left: 15px;
        }

        .card-body li {
            position: relative;
            padding: 10px 0 10px 28px;
            color: #555;
            border-bottom: 1px dashed #eee;
        }

        .card-body li:last-child {
            border-bottom: none;
        }

        .card-body li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 10px;
            height: 10px;
            background: #0099cc;
            border-radius: 50%;
        }

        .stats-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }

        .stat-item {
            background: white;
            padding: 25px;
            border-radius: 10px;
            text-align: center;
            box-shadow: 0 2px 15px rgba(0,0,0,0.05);
        }

        .stat-item .number {
            font-size: 2.2rem;
            font-weight: bold;
            color: #0066cc;
            margin-bottom: 8px;
        }

        .stat-item .label {
            color: #666;
            font-size: 0.95rem;
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            margin-top: 25px;
        }

        .feature-box {
            background: #f8fafc;
            padding: 22px;
            border-radius: 8px;
            border-left: 4px solid #0099cc;
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .feature-box:hover {
            transform: translateY(-3px);
            box-shadow: 0 4px 15px rgba(0,102,204,0.15);
        }

        .feature-box h4 {
            color: #1a365d;
            margin-bottom: 10px;
            font-size: 1.1rem;
        }

        .feature-box p {
            color: #666;
            font-size: 0.9rem;
            margin: 0;
            line-height: 1.7;
        }

        .case-section {
            margin-top: 25px;
        }

        .case-card {
            background: white;
            border-radius: 10px;
            padding: 25px;
            margin-bottom: 20px;
            box-shadow: 0 2px 15px rgba(0,0,0,0.05);
            border-top: 3px solid #0066cc;
        }

        .case-card h3 {
            color: #1a365d;
            margin-bottom: 15px;
            font-size: 1.3rem;
        }

        .case-card .case-meta {
            color: #888;
            font-size: 0.9rem;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 1px solid #eee;
        }

        .case-card .case-content {
            color: #555;
            line-height: 1.8;
        }

        .case-card .case-highlight {
            background: #e8f4fc;
            padding: 15px;
            border-radius: 6px;
            margin-top: 15px;
            font-size: 0.95rem;
            color: #333;
        }

        .case-card .case-highlight strong {
            color: #0066cc;
        }

        .btn {
            display: inline-block;
            padding: 12px 30px;
            background: linear-gradient(135deg, #0066cc 0%, #0099cc 100%);
            color: white;
            text-decoration: none;
            border-radius: 6px;
            font-weight: 500;
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(0,102,204,0.3);
        }

        .footer {
            background: #1a365d;
            color: white;
            text-align: center;
            padding: 40px 20px;
            margin-top: 40px;
        }

        .footer p {
            opacity: 0.9;
            line-height: 1.8;
        }

        .footer .copyright {
            margin-top: 15px;
            font-size: 0.9rem;
            opacity: 0.7;
        }

        @media (max-width: 768px) {
            header h1 {
                font-size: 1.8rem;
            }

            header p {
                font-size: 1rem;
            }

            .nav-bar ul {
                gap: 20px;
            }

            .card-body {
                padding: 20px;
            }
        }