/* CSS Reset & 全局设置 */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        }

        body {
            background-color: #f3f4f6;
            color: #333;
            line-height: 1.6;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }

        /* 主容器：限制最大宽度，保证桌面端阅读体验 */
        .container {
            width: 100%;
            max-width: 800px;
            background: #ffffff;
            border-radius: 16px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            overflow: hidden;
        }

        /* 头部视觉区 */
        .header {
            background: linear-gradient(135deg, #2563eb, #1e40af);
            color: white;
            text-align: center;
            padding: 50px 20px;
        }

        .domain-name {
            font-size: 2.5rem;
            font-weight: 700;
            letter-spacing: 1px;
            margin-bottom: 10px;
            word-break: break-all;
        }

        .title-cn {
            font-size: 1.25rem;
            font-weight: 500;
            margin-bottom: 5px;
            color: #dbeafe;
        }

        .title-en {
            font-size: 1rem;
            font-weight: 300;
            color: #93c5fd;
            text-transform: uppercase;
            letter-spacing: 2px;
        }

        /* 内容区 */
        .main-content {
            padding: 40px 30px;
        }

        /* Whois 卡片 */
        .info-card {
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: 8px;
            padding: 20px;
            margin-bottom: 30px;
        }

        .info-card h3 {
            font-size: 1.1rem;
            color: #1e293b;
            margin-bottom: 15px;
            border-bottom: 2px solid #e2e8f0;
            padding-bottom: 8px;
            display: inline-block;
        }

        .whois-list {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr; /* 桌面端双列布局 */
            gap: 10px 20px;
        }

        .whois-list li {
            font-size: 0.95rem;
            color: #475569;
        }

        .whois-list strong {
            color: #1e293b;
        }

        /* 交易与联系区：使用 Flexbox 实现灵活布局 */
        .action-area {
            display: flex;
            gap: 30px;
            align-items: center;
            justify-content: space-between;
        }

        .buy-section {
            flex: 1;
        }

        .buy-section h3 {
            font-size: 1.5rem;
            color: #0f172a;
            margin-bottom: 10px;
        }

        .buy-section p {
            color: #64748b;
            margin-bottom: 20px;
            font-size: 0.95rem;
        }

        .btn-buy {
            display: inline-block;
            background-color: #f59e0b; /* 醒目的橙色购买按钮 */
            color: white;
            text-decoration: none;
            padding: 12px 30px;
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 600;
            transition: all 0.3s ease;
            box-shadow: 0 4px 6px rgba(245, 158, 11, 0.2);
            text-align: center;
        }

        .btn-buy:hover {
            background-color: #d97706;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(245, 158, 11, 0.3);
        }

        /* 微信二维码区 */
        .contact-section {
            display: flex;
            flex-direction: column;
            align-items: center;
            background: #fff;
            padding: 15px;
            border: 1px solid #e2e8f0;
            border-radius: 12px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.02);
        }

        .qr-placeholder {
            width: 120px;
            height: 120px;
            background-color: #f1f5f9;
            border: 2px dashed #cbd5e1;
            border-radius: 8px;
            display: flex;
            justify-content: center;
            align-items: center;
            text-align: center;
            color: #94a3b8;
            font-size: 0.8rem;
            margin-bottom: 10px;
            overflow: hidden;
        }

        /* 替换实际二维码图片的样式 */
        .qr-placeholder img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .contact-section p {
            font-size: 0.85rem;
            color: #64748b;
            font-weight: 500;
        }

        /* 底部版权 */
        .footer {
            text-align: center;
            padding: 20px;
            background: #f8fafc;
            color: #94a3b8;
            font-size: 0.85rem;
            border-top: 1px solid #e2e8f0;
        }

        /* ------------------ 移动端适配 (核心) ------------------ */
        @media (max-width: 640px) {
            .header {
                padding: 40px 15px;
            }
            .domain-name {
                font-size: 2rem;
            }
            .main-content {
                padding: 25px 20px;
            }
            .whois-list {
                grid-template-columns: 1fr; /* 手机端改为单列展示信息 */
            }
            .action-area {
                flex-direction: column; /* 手机端上下堆叠 */
                text-align: center;
            }
            .btn-buy {
                width: 100%; /* 按钮在手机端占满全宽，方便点击 */
            }
            .contact-section {
                width: 100%;
                margin-top: 10px;
            }
        }