body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #f4f7fa;
            margin: 0;
            padding: 0;
        }

        .container {
            max-width: 700px;
            margin: 50px auto;
            background: #fff;
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
        }

        h2, h3 {
            text-align: center;
            color: #2c3e50;
            margin-bottom: 10px;
        }

        p {
            text-align: center;
            color: #7f8c8d;
        }

        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            font-weight: 600;
            color: #34495e;
            margin-bottom: 8px;
        }

        input[type="text"],
        textarea {
            width: 100%;
            padding: 12px;
            border-radius: 8px;
            border: 1px solid #ccc;
            font-size: 16px;
            transition: border-color 0.3s ease;
        }

        input[readonly], textarea[readonly] {
            background-color: #f0f0f0;
            color: #555;
        }

        input:focus, textarea:focus {
            border-color: #2980b9;
            outline: none;
        }

        .text-center {
            text-align: center;
        }

        .btn {
            display: inline-block;
            padding: 12px 25px;
            font-size: 16px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.3s ease;
            text-decoration: none;
            margin: 5px;
        }

        .btn-primary {
            background-color: #3498db;
            color: #fff;
        }

        .btn-primary:hover {
            background-color: #2980b9;
        }

        .btn-secondary {
            background-color: #bdc3c7;
            color: #2c3e50;
        }

        .btn-secondary:hover {
            background-color: #95a5a6;
        }

        .image-preview-container {
            text-align: center;
            margin-top: 15px;
        }

        .image-preview-container img {
            max-width: 100%;
            border-radius: 8px;
            border: 1px solid #ccc;
        }

        .mt-4 { margin-top: 1.5rem; }
        .mt-5 { margin-top: 3rem; }
        .mb-3 { margin-bottom: 1rem; }