.v2-editor-shell{--v2-canvas-bg:#f5f5f5;--v2-panel-bg:#ffffff;--v2-panel-bg-subtle:#fafafa;--v2-border:rgba(0,0,0,0.08);--v2-border-strong:rgba(0,0,0,0.12);--v2-text:rgba(0,0,0,0.88);--v2-text-secondary:rgba(0,0,0,0.55);--v2-text-muted:rgba(0,0,0,0.4);--v2-accent:#0d99ff;--v2-accent-hover:#0077cc;--v2-accent-soft:rgba(13,153,255,0.1);--v2-accent-border:rgba(13,153,255,0.35);--v2-shadow-sm:0 1px 2px rgba(0,0,0,0.06);--v2-shadow-md:0 4px 16px rgba(0,0,0,0.08),0 0 1px rgba(0,0,0,0.06);--v2-shadow-lg:0 8px 32px rgba(0,0,0,0.12),0 0 1px rgba(0,0,0,0.08);--v2-radius-sm:8px;--v2-radius-md:12px;--v2-radius-pill:999px;--v2-font-ui:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;--v2-font-mono:ui-monospace,SFMono-Regular,Menlo,monospace;--v2-playhead:#f24822;--v2-warning-bg:rgba(255,171,0,0.12);--v2-warning-border:rgba(255,171,0,0.35);--v2-warning-text:rgba(120,70,0,0.95)}.v2-editor-lab-back{position:absolute;top:12px;left:12px;z-index:90;display:inline-flex;align-items:center;gap:4px;padding:6px 12px;border-radius:var(--v2-radius-sm);background:var(--v2-panel-bg);border:1px solid var(--v2-border);box-shadow:var(--v2-shadow-sm);color:var(--v2-text);font-size:.8125rem;font-family:var(--v2-font-ui);font-weight:500;text-decoration:none;transition:background .12s ease,border-color .12s ease}.v2-editor-lab-back:hover{background:var(--v2-panel-bg-subtle);border-color:var(--v2-border-strong)}