/* ===== CUSTOM STYLES ===== */
        /* Fullscreen iframe container and body overflow handling */
        html, body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            overflow: hidden;
        }

        #iframe-container {
            width: 100%;
            height: calc(100% - 70px);
            border: none;
            margin-top: 70px;
        }

        /* Loading spinner animation */
        @keyframes spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .spinner {
            animation: spin 1s linear infinite;
        }

        /* Top navigation bar styles */
        #top-nav-bar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 70px;
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            z-index: 100;
            display: flex;
            align-items: center;
            padding: 0 1.5rem;
            gap: 1.5rem;
        }

        #back-button {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background-color: rgba(59, 130, 246, 0.2);
            border: 1px solid rgba(59, 130, 246, 0.5);
            border-radius: 0.5rem;
            color: #3b82f6;
            text-decoration: none;
            transition: all 0.3s ease;
            font-size: 1.25rem;
            line-height: 1;
        }

        #back-button:hover {
            background-color: rgba(59, 130, 246, 0.3);
            border-color: rgba(59, 130, 246, 0.8);
            transform: translateX(-2px);
        }

        #logo-link {
            display: flex;
            align-items: center;
            text-decoration: none;
            transition: opacity 0.3s ease;
        }

        #logo-link:hover {
            opacity: 0.8;
        }

        #logo-image {
            height: 50px;
            width: auto;
            object-fit: contain;
        }