* {
            box-sizing: border-box;
        }
        body {
            margin: 0;
            font-family: Arial, sans-serif;
            background: #ffffff;
            color: #eee;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }
        nav {
            background: #f8d300;
            padding: 15px 20px;
            color: white;
            font-weight: bold;
            font-size: 20px;
        }
        nav .nav-link {
            float: right;
            cursor: pointer;
            font-weight: normal;
            font-size: 16px;
            color: white;
        }
        nav .nav-link:hover {
            text-decoration: underline;
        }

        .container {
            flex: 1;
            max-width: 480px;
            margin: 40px auto;
            padding: 20px;
            background: #bdbdbd;
            border-radius: 6px;
            box-shadow: 0 0 12px rgba(83, 83, 83, 0.6);
        }
        h1 {
            text-align: center;
            margin-bottom: 20px;
            color: #070707;
        }
        h2 {
            margin-top: 25px;
            margin-bottom: 10px;
            color: #000000;
            border-bottom: 1px solid #4d4d4d;
            padding-bottom: 6px;
        }

        input[type="url"],
        input[type="file"],
        button {
            width: 100%;
            padding: 10px;
            margin-top: 10px;
            border: none;
            border-radius: 4px;
            font-size: 16px;
        }

        input[type="url"],
        input[type="file"] {
            background: #ffffff;
            color: #000000;
        }
        input[type="url"]:focus,
        input[type="file"]:focus {
            background: #333;
            outline: none;
        }

        button {
            background: #ec9a00;
            color: #121212;
            font-weight: bold;
            cursor: pointer;
            margin-top: 15px;
            transition: background 0.3s ease;
        }
        button:hover {
            background: #c98200;
        }

        .success, .error {
            margin-top: 25px;
            padding: 15px;
            border-radius: 6px;
            font-weight: bold;
            text-align: center;
        }
        .success {
            background-color: #1db954;
            color: #121212;
        }
        .error {
            background-color: #d9534f;
            color: white;
        }

        progress {
            width: 100%;
            height: 18px;
            border-radius: 4px;
            margin-top: 10px;
            display: none;
        }