body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
            background: #f7f7f7;
            margin: 0;
            padding: 0;
        }

        header {
            background: #222;
            color: #fff;
            padding: 24px;
            text-align: center;
        }

        main {
            max-width: 900px;
            margin: 40px auto;
            padding: 0 20px;
        }

        .card {
            background: #fff;
            border-radius: 12px;
            padding: 24px;
            margin-bottom: 24px;
            box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
        }

        .card h2 {
            margin-top: 0;
        }

        a.button {
            display: inline-block;
            margin-top: 12px;
            padding: 10px 18px;
            background: #007bff;
            color: #fff;
            text-decoration: none;
            border-radius: 8px;
        }

        footer {
            text-align: center;
            font-size: 13px;
            color: #666;
            margin: 40px 0 20px;
        }

        footer a {
            color: #666;
            text-decoration: none;
        }

        .mobile-only {
            display: none;
        }

        @media (max-width: 768px) {
            .mobile-only {
                display: block;
                margin-bottom: 24px;
                text-align: center;
            }
        }

        .coupang-notice {
            font-size: 12px;
            color: #666;
            margin-top: 8px;
            line-height: 1.4;
            text-align: center;
        }