.fab-back {
            position: fixed;
            bottom: 24px;
            left: 24px;
            width: 56px;
            height: 56px;
            border-radius: 999px;
            background: linear-gradient(135deg, #38bdf8, #22c55e);
            border: none;
            cursor: pointer;
            font-size: 26px;
            color: #020617;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 12px 25px rgba(34, 197, 94, 0.35);
            transition: transform 0.1s ease, filter 0.1s ease;
            z-index: 1000;
        }

        .fab-back:hover {
            filter: brightness(1.08);
        }

        .fab-back:active {
            transform: scale(0.94);
        }