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pageFade{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.back-to-top{bottom:var(--space-6);right:var(--space-6);background:var(--color-bg-surface);border:1px solid var(--color-border);width:44px;height:44px;z-index:var(--z-overlay);transition:border-color var(--duration-fast) var(--ease-standard), transform var(--duration-fast) var(--ease-standard);border-radius:50%;place-items:center;display:grid;position:fixed}.back-to-top:hover{border-color:var(--color-accent);color:var(--color-accent);transform:translateY(-3px)}