/* Global resets and Telegram-friendly defaults */
        body {
            margin: 0;
            padding: 0;
            background-color: var(--tg-theme-bg-color, #f0f3f5);;
            color: #333;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
        }

        /* Centered card-style container */
        .container {
            max-width: 400px;
            margin: 30px auto;
            padding: 24px;
            background-color: #fff;
            border-radius: 12px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        }

        /* Header with a Telegram-like icon */
        .header {
            text-align: center;
            margin-bottom: 24px;
        }
        .header svg {
            width: 48px;
            height: 48px;
            margin-bottom: 8px;
        }
        .header h1 {
            margin: 0;
            font-size: 24px;
        }

        /* Form controls */
        .form-group {
            margin-bottom: 16px;
        }
        label {
            display: block;
            margin-bottom: 6px;
            font-weight: bold;
        }
        input[type="number"],
        select,
        input[type="file"] {
            width: 100%;
            padding: 10px;
            font-size: 16px;
            border: 1px solid #ccc;
            border-radius: 8px;
            box-sizing: border-box;
        }

        /* Telegram-style buttons */
        .tg_button {
            background-color: #0088cc;
            color: #fff;
            border: none;
            border-radius: 8px;
            padding: 12px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            width: 100%;
            transition: background-color 0.3s ease;
        }
        .tg_button:hover {
            background-color: #006fa1;
        }

        /* Subheader text */
        .subheader {
            text-align: center;
            font-size: 14px;
            margin-top: 16px;
            color: #888;
        }

        /* Hidden helper */
        .hidden {
            display: none;
        }

        /* Fade-in animation for smoother transitions */
        .fade-in {
            animation: fadeIn 0.5s ease-out;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Back button in step2 */
        .back-button {
            background-color: transparent;
            border: none;
            color: #0088cc;
            font-size: 14px;
            text-decoration: underline;
            cursor: pointer;
            margin-top: 12px;
        }
        .back-button:hover {
            color: #006fa1;
        }