.fc-transition-bar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, #1d4ed8 0%, #38bdf8 50%, #1d4ed8 100%);
            transform: scaleX(0);
            transform-origin: left;
            opacity: 0;
            z-index: 60;
            pointer-events: none;
        }

        .fc-transition-bar.is-active {
            opacity: 1;
            animation: fcProgress 1.1s ease-out forwards;
        }

        .fc-activity {
            position: fixed;
            right: 1rem;
            bottom: 1rem;
            display: inline-flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.65rem 1rem 0.65rem 0.7rem;
            background: var(--surface-elevated);
            border: 1px solid var(--surface-border);
            border-radius: 999px;
            box-shadow: 0 14px 30px rgba(15, 23, 42, 0.18);
            opacity: 0;
            transform: translateY(12px);
            pointer-events: none;
            transition: opacity 0.2s ease, transform 0.2s ease;
            z-index: 60;
        }

        .fc-activity.is-visible {
            opacity: 1;
            transform: translateY(0);
        }

        .fc-logo {
            width: 38px;
            height: 38px;
            border-radius: 999px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #1d4ed8 0%, #38bdf8 100%);
            color: #ffffff;
            font-size: 0.68rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            position: relative;
            text-transform: uppercase;
            box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
        }

        .fc-logo::after {
            content: "";
            position: absolute;
            inset: -6px;
            border-radius: 999px;
            border: 1px solid rgba(59, 130, 246, 0.35);
            animation: fcPulse 1.8s ease-out infinite;
        }

        .fc-activity-text {
            display: flex;
            flex-direction: column;
            line-height: 1.1;
        }

        .fc-activity-title {
            font-size: 0.55rem;
            letter-spacing: 0.2em;
            text-transform: uppercase;
            color: var(--text-secondary);
            font-weight: 700;
        }

        .fc-activity-message {
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--text-primary);
        }

        .fc-activity[data-mode="success"] .fc-logo {
            background: linear-gradient(135deg, #16a34a 0%, #22c55e 100%);
            box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.25);
        }

        .fc-activity[data-mode="error"] .fc-logo {
            background: linear-gradient(135deg, #dc2626 0%, #f97316 100%);
            box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.25);
        }

        @keyframes fcPulse {
            0% { opacity: 0.45; transform: scale(0.9); }
            70% { opacity: 0; transform: scale(1.15); }
            100% { opacity: 0; transform: scale(1.15); }
        }

        @keyframes fcProgress {
            0% { transform: scaleX(0); }
            60% { transform: scaleX(0.65); }
            100% { transform: scaleX(1); }
        }

        @media (prefers-reduced-motion: reduce) {
            .fc-transition-bar.is-active,
            .fc-logo::after {
                animation: none !important;
            }
            .fc-activity {
                transition: none;
            }
        }