osition: fixed;
        bottom: 2rem;
        right: 2rem;
        width: 60px;
        height: 60px;
        border-radius: var(--radius-full);
        background: var(--glass-bg);
        backdrop-filter: blur(20px);
        border: 1px solid var(--glass-border);
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        box-shadow: var(--shadow-medium);
        outline: none;
        opacity: 0;
        transition: var(--transition-smooth);
     