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12px;background:var(--surface-2);cursor:pointer;max-width:420px}.content{flex:1;padding:var(--space-6);max-width:1280px;width:100%;margin:0 auto}@media(max-width:860px){.content{padding:var(--space-4);padding-bottom:90px}}.demo-banner{background:var(--accent-soft);color:var(--accent);text-align:center;font-size:var(--text-sm);font-weight:600;padding:6px 12px}.mfa-banner{background:var(--warning-soft);color:var(--warning);text-align:center;font-size:var(--text-sm);font-weight:600;padding:6px 12px;display:flex;gap:6px;align-items:center;justify-content:center}.bottom-nav{position:fixed;bottom:0;inset-inline:0;height:64px;background:var(--surface);border-top:1px solid var(--border);z-index:50;padding-bottom:env(safe-area-inset-bottom)}@media(max-width:860px){.bottom-nav{display:flex}}.bottom-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:var(--text-3);text-decoration:none!important;font-size:11px}.bottom-item svg{width:21px;height:21px}.bottom-item.active{color:var(--primary)}.tree-wrap{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:12px}.tree-fullscreen{position:fixed;top:12px;right:12px;bottom:12px;left:12px;z-index:95;overflow:auto;box-shadow:var(--shadow-lg)}.tree-toolbar{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.tree-search{position:relative;display:flex;align-items:center;gap:6px;border:1px solid var(--border-strong);border-radius:var(--radius);padding:0 8px;height:34px;background:var(--surface-2);width:180px}.tree-search input{border:0;background:transparent;outline:none;width:100%;font-size:var(--text-sm);color:var(--text)}.tree-search-results{position:absolute;top:38px;inset-inline-start:0;width:240px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg);z-index:20;max-height:240px;overflow:auto}.tree-search-results button{display:block;width:100%;text-align:start;border:0;background:transparent;padding:8px 10px;cursor:pointer;font-size:var(--text-sm)}.tree-search-results button:hover{background:var(--surface-2)}.tree-canvas{overflow:hidden;touch-action:none;cursor:grab;border-radius:var(--radius);background:var(--surface-2);margin-top:10px;height:480px;position:relative}.tree-canvas:active{cursor:grabbing}.tree-stage{position:relative;transform-origin:0 0;transition:transform .05s linear}.tree-card{position:absolute;display:flex;align-items:center;gap:8px;padding:0 10px;border-radius:12px;border:2px solid transparent;cursor:pointer;-webkit-user-select:none;user-select:none;transition:box-shadow .15s}.tree-card:hover{box-shadow:var(--shadow)}.tree-more-dot{position:absolute;bottom:-4px;inset-inline-end:-4px;width:12px;height:12px;border-radius:50%;background:var(--primary);border:2px solid var(--surface)}.tree-legend{display:flex;gap:14px;flex-wrap:wrap;margin-top:10px;font-size:var(--text-xs);color:var(--text-2)}.tree-legend span{display:inline-flex;align-items:center;gap:5px}.tree-swatch{width:12px;height:12px;border-radius:3px;border:1px solid var(--border-strong);display:inline-block}.tree-swatch-dashed{background:transparent;border-style:dashed}@media print{.tree-toolbar,.tree-legend,.shell aside,.topbar,.bottom-nav{display:none!important}.tree-canvas{height:auto;overflow:visible}.tree-stage{transform:none!important}}.chat-shell{display:grid;grid-template-columns:320px 1fr;height:calc(100vh - var(--topbar-h) - 2 * var(--space-6));border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;background:var(--surface)}@media(max-width:860px){.chat-shell{grid-template-columns:1fr;height:calc(100vh - var(--topbar-h) - 64px)}.chat-shell.has-active .chat-list{display:none}.chat-shell:not(.has-active) .chat-thread{display:none}}.chat-list{display:flex;flex-direction:column;border-inline-end:1px solid var(--border);min-height:0}.chat-list-header{display:flex;align-items:center;gap:8px;padding:10px 12px;border-bottom:1px solid var(--border)}.chat-search-input{border:0;background:var(--surface-2);border-radius:var(--radius);padding:7px 10px;font-size:var(--text-sm);flex:1;outline:none}.chat-list-items{overflow:auto;flex:1}.chat-list-item{display:flex;gap:10px;width:100%;padding:10px 12px;border:0;background:transparent;text-align:start;cursor:pointer;border-bottom:1px solid var(--border)}.chat-list-item:hover,.chat-list-item.active{background:var(--surface-2)}.chat-thread{display:flex;flex-direction:column;min-height:0}.chat-thread-header{display:flex;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid var(--border)}.chat-security-note{text-align:center;color:var(--text-3);padding:4px;background:var(--surface-2)}.chat-messages{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:2px}.chat-date-sep{text-align:center;margin:10px 0}.chat-date-sep span{font-size:var(--text-xs);background:var(--surface-2);color:var(--text-3);padding:3px 10px;border-radius:99px}.chat-system{text-align:center;font-size:var(--text-xs);color:var(--text-3);margin:8px 0}.chat-row{display:flex;gap:8px;margin:6px 0;align-items:flex-end;max-width:78%}.chat-row.mine{margin-inline-start:auto;flex-direction:row-reverse}.chat-bubble-wrap{position:relative;min-width:0}.chat-bubble{background:var(--surface-2);border-radius:14px;padding:8px 12px;font-size:var(--text-base);position:relative}.chat-bubble.mine{background:var(--primary-soft)}.chat-bubble.deleted{font-style:italic;color:var(--text-3)}.chat-meta{color:var(--text-3);margin-top:3px;display:flex;align-items:center;justify-content:flex-end}.chat-reply-ref{border-inline-start:3px solid var(--primary);padding-inline-start:8px;margin-bottom:6px;opacity:.85}.chat-reactions{display:flex;gap:4px;margin-top:4px;font-size:12px}.chat-reactions span{background:var(--surface);border:1px solid var(--border);border-radius:99px;padding:1px 6px}.chat-actions{display:none;gap:2px;position:absolute;top:-30px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:2px;box-shadow:var(--shadow);z-index:5}.chat-row.mine .chat-actions{inset-inline-end:0}.chat-bubble-wrap:hover .chat-actions,.chat-bubble-wrap:focus-within .chat-actions{display:flex}.chat-actions button{border:0;background:transparent;cursor:pointer;font-size:14px;padding:4px 6px;border-radius:6px}.chat-actions button:hover{background:var(--surface-2)}.chat-attachment-img{max-width:220px;border-radius:10px}.chat-attachment-file{display:flex;align-items:center;gap:6px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:6px 10px;font-size:var(--text-sm)}.chat-composer{border-top:1px solid var(--border);padding:10px 12px}.chat-reply-preview{display:flex;align-items:center;gap:8px;background:var(--surface-2);border-radius:var(--radius);padding:6px 10px;margin-bottom:6px}.chat-input{flex:1;border:1px solid var(--border-strong);border-radius:20px;padding:9px 14px;background:var(--surface);outline:none;font-size:var(--text-base)}