:root {
            --primary-color: #00AFB7;
            --text-dark: #333333;
            --text-light: #666666;
            --bg-light: #f9fbfb;
        }

        .nb-contact-container {
            max-width: 1100px;
            margin: 60px auto;
            padding: 0 20px;
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            color: var(--text-dark);
        }

        .nb-header {
            text-align: center;
            margin-bottom: 50px;
        }

        .nb-header h1 {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }

        .nb-cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }

        .nb-card {
            background: #ffffff;
            border: 1px solid #e0e0e0;
            border-radius: 15px;
            padding: 40px 30px;
            text-align: center;
            transition: all 0.3s ease;
        }

        .nb-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 20px rgba(0, 175, 183, 0.1);
            border-color: var(--primary-color);
        }

        /* 专门针对通讯工具的样式 */
        .messenger-box {
            background: #f0fafa;
            border-radius: 10px;
            padding: 15px;
            margin-top: 15px;
        }

        .qr-placeholder {
            width: 120px;
            height: 120px;
            background: #eee;
            margin: 15px auto;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            color: #999;
            border: 1px dashed var(--primary-color);
        }

        .nb-btn {
            background-color: var(--primary-color);
            color: white;
            padding: 12px 30px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            display: inline-block;
            margin-top: 10px;
        }

        .nb-link {
            font-weight: 600;
            color: var(--primary-color);
            text-decoration: none;
        }

        .nb-footer-note {
            text-align: center;
            margin-top: 50px;
            padding: 20px;
            background: var(--bg-light);
            border-radius: 12px;
        }