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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
            background: #fff;
            color: #000;
            line-height: 1.6;
            padding: 1.5rem;
            font-size: 16px;
        }

        .container {
            max-width: 480px;
            margin: 2rem auto;
        }

        h2 {
            font-size: 1.8rem;
            font-weight: normal;
            margin-bottom: 1.5rem;
            text-align: center;
        }

        .alert {
            background: #ffebee;
            color: #c62828;
            padding: 12px 16px;
            border-radius: 6px;
            margin-bottom: 1.5rem;
            font-size: 0.95rem;
        }

        form {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        input[type="text"],
        input[type="email"],
        input[type="password"] {
            width: 100%;
            padding: 14px;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 16px; /* 防止 iOS 缩放 */
            outline: none;
            transition: border-color 0.2s;
        }

        input:focus {
            border-color: #000;
        }

        button[type="submit"] {
            background: #000;
            color: #fff;
            border: none;
            padding: 14px;
            font-size: 16px;
            border-radius: 6px;
            cursor: pointer;
            font-weight: bold;
            transition: opacity 0.2s;
        }

        button[type="submit"]:hover,
        button[type="submit"]:active {
            opacity: 0.9;
        }

        .footer-link {
            text-align: center;
            margin-top: 1.2rem;
            font-size: 0.95rem;
            color: #666;
        }

        .footer-link a {
            color: #000;
            text-decoration: none;
        }

        .footer-link a:hover {
            text-decoration: underline;
        }

        @media (min-width: 768px) {
            body {
                padding: 2rem;
            }
        }
        
        
        
        
        
        
        
        
        
        
        
         * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
            background: #fff;
            color: #000;
            line-height: 1.6;
            padding: 1.5rem;
            font-size: 16px;
        }

        .container {
            max-width: 480px;
            margin: 2rem auto;
        }

        h2 {
            font-size: 1.8rem;
            font-weight: normal;
            margin-bottom: 1.5rem;
            text-align: center;
        }

        .alert {
            background: #ffebee;
            color: #c62828;
            padding: 12px 16px;
            border-radius: 6px;
            margin-bottom: 1.5rem;
            font-size: 0.95rem;
        }

        form {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        input[type="text"],
        input[type="password"] {
            width: 100%;
            padding: 14px;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 16px; /* 防止 iOS 自动缩放 */
            outline: none;
            transition: border-color 0.2s;
        }

        input:focus {
            border-color: #000;
        }

        button[type="submit"] {
            background: #000;
            color: #fff;
            border: none;
            padding: 14px;
            font-size: 16px;
            border-radius: 6px;
            cursor: pointer;
            font-weight: bold;
            transition: opacity 0.2s;
        }

        button[type="submit"]:hover,
        button[type="submit"]:active {
            opacity: 0.9;
        }

        .footer-link {
            text-align: center;
            margin-top: 1.2rem;
            font-size: 0.95rem;
            color: #666;
        }

        .footer-link a {
            color: #000;
            text-decoration: none;
        }

        .footer-link a:hover {
            text-decoration: underline;
        }

        @media (min-width: 768px) {
            body {
                padding: 2rem;
            }
        }