.back-to-top{position:fixed;bottom:var(--space-lg);right:var(--space-lg);width:2.5rem;height:2.5rem;display:flex;align-items:center;justify-content:center;line-height:0;background:var(--color-primary);color:var(--color-text-inverted);border:2px solid transparent;border-radius:var(--radius-full);cursor:pointer;transition:background var(--transition-fast) ease,color var(--transition-fast) ease,border-color var(--transition-fast) ease,transform var(--transition-fast) ease,box-shadow var(--transition-fast) ease;z-index:var(--z-index-overlay)}.back-to-top svg{display:block;fill:currentColor;stroke:none}.back-to-top:hover{background:var(--footer-bg-gradient);color:var(--color-primary);border-color:var(--color-primary);transform:scale(1.1)}