body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #d1d1d1, #7a7a7a);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: flex-start;
            min-height: 100vh;
            margin: 0;
            padding: 20px;
        }

        .header-container {
            margin: 20px 0;
            text-align: center;
        }

        @keyframes shine {
            0%, 100% {
                text-shadow:
                    1px 1px 0 #4a4a4a,
                    2px 2px 0 #3b3b3b,
                    3px 3px 0 #2c2c2c,
                    4px 4px 8px rgba(0, 0, 0, 0.6);
            }
            50% {
                text-shadow:
                    1px 1px 0 #6f6f6f,
                    2px 2px 0 #5a5a5a,
                    3px 3px 0 #474747,
                    4px 4px 12px rgba(0, 0, 0, 0.8);
            }
        }

        header {
            font-family: 'Poppins', sans-serif;
            font-weight: 600;
            font-size: 2.5rem;
            color: #e0e0e0;
            user-select: none;
            text-shadow:
                1px 1px 0 #4a4a4a,
                2px 2px 0 #3b3b3b,
                3px 3px 0 #2c2c2c,
                4px 4px 8px rgba(0, 0, 0, 0.6);
            animation: shine 3s ease-in-out infinite;
            transition: transform 0.3s ease, text-shadow 0.3s ease;
            cursor: default;
        }

        header:hover {
            transform: scale(1.05);
            text-shadow:
                2px 2px 2px #7a7a7a,
                4px 4px 8px #9e9e9e,
                6px 6px 15px rgba(0, 0, 0, 0.9);
        }

        .container {
            background: white;
            padding: 30px 20px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
            text-align: center;
            width: 100%;
            max-width: 400px;
        }

        h2 {
            margin-bottom: 20px;
            color: #333;
        }

        input[type="file"] {
            display: none;
        }

        .custom-file-upload {
            display: inline-block;
            padding: 12px 20px;
            cursor: pointer;
            border-radius: 8px;
            background-color: #007bff;
            color: white;
            font-weight: 600;
            font-size: 16px;
            transition: background-color 0.3s ease;
            box-shadow: 0 4px 8px rgba(0, 123, 255, 0.3);
            user-select: none;
        }

        .custom-file-upload:hover {
            background-color: #0056b3;
            box-shadow: 0 6px 12px rgba(0, 86, 179, 0.4);
        }

        #file-name {
            margin-top: 15px;
            font-style: italic;
            color: #555;
            min-height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            flex-wrap: wrap;
            text-align: center;
        }

        .check-icon {
            width: 40px;
            height: 40px;
            fill: #28a745;
        }

        input[type="submit"] {
            background-color: #4CAF50;
            color: white;
            border: none;
            padding: 10px 20px;
            margin-top: 25px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 18px;
            font-weight: bold;
            transition: background-color 0.3s ease;
            width: 100%;
        }

        input[type="submit"]:hover {
            background-color: #45a049;
        }

        label {
            font-weight: bold;
            display: block;
            margin-bottom: 10px;
        }

        footer {
            margin-top: 40px;
            text-align: center;
        }

        footer img {
            width: 120px;
            height: auto;
            margin-bottom: 10px;
        }

        .footer-text {
            font-family: 'Poppins', sans-serif;
            font-weight: 600;
            font-size: 1.3rem;
            color: #fcf9f9;
            text-shadow:
                1px 1px 0 #4a4a4a,
                2px 2px 0 #3b3b3b,
                3px 3px 0 #2c2c2c,
                4px 4px 8px rgba(0, 0, 0, 0.6);
        }

        @media (max-width: 600px) {
            header {
                font-size: 1.8rem;
            }

            .custom-file-upload {
                font-size: 14px;
                padding: 10px 15px;
            }

            .container {
                padding: 20px 15px;
            }

            input[type="submit"] {
                font-size: 14px;
            }
        }