body {
            margin: 0;
            font-family: Arial, sans-serif;
            background: #f4f4f4;
            color: #222;
        }

        header {
            background: #111827;
            color: white;
            padding: 20px;
            text-align: center;
        }

        main {
            max-width: 600px;
            margin: 40px auto;
            padding: 0 20px;
        }

        .box {
            background: white;
            padding: 30px;
            border-radius: 10px;
        }

        label {
            display: block;
            margin-top: 15px;
            margin-bottom: 5px;
            font-weight: bold;
        }

        input {
            width: 100%;
            box-sizing: border-box;
            padding: 10px;
            font-size: 16px;
        }

        button {
            margin-top: 20px;
            padding: 12px 20px;
            background: #111827;
            color: white;
            border: none;
            border-radius: 6px;
            cursor: pointer;
            font-size: 16px;
        }

        button:hover {
            background: #374151;
        }

        .error {
            background: #fee2e2;
            padding: 12px;
            margin-bottom: 20px;
            border-radius: 6px;
        }

        a {
            color: #111827;
        }