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var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.tree-toolbar{height:36px;flex-shrink:0;display:flex;align-items:center;justify-content:space-between;padding:0 12px;gap:6px;background:var(--bg-panel);border-bottom:1px solid var(--border)}.tree-toolbar-left,.tree-toolbar-right{display:flex;align-items:center;gap:6px}.tree-toolbar button{background:var(--bg-secondary);color:var(--text-secondary);border:1px solid var(--border);border-radius:var(--radius-sm);padding:5px 12px;font-size:12px;font-weight:500;cursor:pointer;font-family:inherit;transition:background var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast)}.tree-toolbar button:hover{background:var(--bg-hover);border-color:var(--accent);color:var(--accent)}.tree-toolbar button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.toolbar-status{font-size:11px;color:var(--color-trail);font-weight:500;animation:pulse 1s ease-in-out infinite}.node-count-chip{font-size:11px;font-weight:600;color:var(--text-muted);background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);padding:2px 10px;transition:color var(--transition-fast),border-color var(--transition-fast)}.node-count-chip.chip-amber{color:var(--color-trail);border-color:var(--color-trail-dim)}.node-count-chip.chip-orange{color:var(--color-leaf);border-color:var(--color-leaf-dim)}@media (max-width: 1279px){:root{--sidebar-width: 200px;--panel-width: 340px}}@media (min-width: 1280px) and (max-width: 1599px){:root{--sidebar-width: 220px;--panel-width: 380px}}@media (min-width: 1600px){:root{--sidebar-width: 240px;--panel-width: 420px}}@media (max-width: 959px){.app-shell:after{content:"Please use a larger screen (960px+) for the best experience.";position:fixed;top:0;right:0;bottom:0;left:0;z-index:9999;background:var(--bg-primary);color:var(--text-secondary);display:flex;align-items:center;justify-content:center;padding:40px;text-align:center;font-size:16px}}[data-theme=light] .app-header{box-shadow:0 1px 4px #00000014}[data-theme=light] .sidebar{background:#f4f7fb}[data-theme=light] .standards-panel{box-shadow:-4px 0 20px #0000001a}[data-theme=light] .tree-toolbar{background:#f8fafc;box-shadow:0 1px 3px #0000000d}[data-theme=light] .tree-toolbar button{background:#fff}[data-theme=light] .tree-toolbar button:hover{background:#eef1f5;border-color:var(--accent)}[data-theme=light] .node-count-chip{background:#fff}@keyframes pulse{0%,to{opacity:1}50%{opacity:.45}}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}