.browse-toolbar{position:absolute;top:0;left:0;right:0;display:flex;align-items:center;justify-content:space-between;height:var(--toolbar-height);padding:0 var(--space-4);background:var(--color-bg);border-bottom:1px solid var(--border-subtle);gap:var(--space-4);z-index:var(--z-toolbar)}.browse-toolbar :where(.sidebar-toggle,.share-btn,.download-btn,.edit-btn,.reading-settings-btn,.theme-toggle){opacity:.55;transition:opacity var(--duration-normal) var(--ease-out)}.browse-toolbar:hover :where(.sidebar-toggle,.share-btn,.download-btn,.edit-btn,.reading-settings-btn,.theme-toggle),.browse-toolbar:focus-within :where(.sidebar-toggle,.share-btn,.download-btn,.edit-btn,.reading-settings-btn,.theme-toggle){opacity:1}.browse-toolbar-left{display:flex;align-items:center;gap:var(--space-1);min-width:0}.active-file-name{margin-left:var(--space-1);min-width:0;font-family:var(--font-sans);font-size:var(--text-sm);font-weight:var(--weight-semibold);color:var(--color-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;opacity:0;transition:opacity var(--duration-normal) var(--ease-out)}.active-file-name.visible{opacity:1}.browse-toolbar-right{display:flex;align-items:center;gap:var(--space-2);flex-shrink:0}.download-btn,.share-btn{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:var(--radius-md);color:var(--color-text-tertiary);cursor:pointer;transition:background-color var(--duration-fast) ease,color var(--duration-fast) ease}.download-btn:hover,.share-btn:hover{background:var(--color-surface-hover);color:var(--color-text-secondary)}.download-btn svg,.share-btn svg{width:16px;height:16px}.download-btn[hidden],.share-btn[hidden]{display:none}[data-tooltip]{position:relative}[data-tooltip]:after{content:attr(data-tooltip);position:absolute;top:calc(100% + 7px);left:50%;transform:translate(-50%) translateY(-3px) scale(.96);transform-origin:top center;z-index:var(--z-modal);padding:5px 8px;border-radius:var(--radius-sm);background:var(--color-text);color:var(--color-text-inverse);font-family:var(--font-sans);font-size:var(--text-xs);font-weight:var(--weight-medium);line-height:1;letter-spacing:.01em;white-space:pre;box-shadow:var(--shadow-overlay);opacity:0;pointer-events:none;transition:opacity var(--duration-fast) var(--ease-out),transform var(--duration-fast) var(--ease-out)}[data-tooltip]:hover:after,[data-tooltip]:focus-visible:after{opacity:1;transform:translate(-50%) translateY(0) scale(1);transition-delay:.14s}[data-tooltip][aria-expanded=true]:after{opacity:0;transition-delay:0s}@media(hover:none){[data-tooltip]:after{content:none}}@media(prefers-reduced-motion:reduce){[data-tooltip]:after{transition:opacity var(--duration-fast) ease;transform:translate(-50%)}[data-tooltip]:hover:after,[data-tooltip]:focus-visible:after{transform:translate(-50%)}}