.tab-content { display: none; }
        .tab-content.active { display: block; }
        .tab.active {
            border-bottom: 3px solid #0f172a; /* Darker blue/slate for professional look */
            color: #0f172a;
            font-weight: 700;
        }
        /* Spinner for the button, kept small and contained */
        .loading-animation {
            border: 4px solid #f3f4f6;
            border-top: 4px solid #ffffff; /* White spinner against slate background */
            border-radius: 50%;
            width: 18px;
            height: 18px;
            animation: spin 1s linear infinite;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        #raw-result {
            max-height: 400px;
            overflow-y: auto;
            white-space: pre-wrap;
            word-wrap: break-word;
        }