:root{--bg: #1a1b26;--panel: #24283b;--panel-2: #1f2335;--text: #c0caf5;--muted: #565f89;--accent: #7aa2f7;--user: #2a3a5a;--assistant: #2a4a3a;--system: #3a2a4a;--border: #2f334d}*{box-sizing:border-box}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;background:var(--bg);color:var(--text)}.app{display:grid;grid-template-columns:300px 1fr;height:100vh}.loading,.empty{padding:2rem;color:var(--muted)}.sidebar{background:var(--panel-2);border-right:1px solid var(--border);overflow-y:auto}.sidebar-header{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;border-bottom:1px solid var(--border)}.sidebar-header button{background:var(--accent);border:none;color:#1a1b26;border-radius:6px;width:26px;height:26px;cursor:pointer;font-size:16px}.thread-tree ul{list-style:none;margin:0;padding:0}.thread-row{display:flex;align-items:center;gap:4px;padding:4px 8px}.thread-row.active{background:var(--panel);border-left:3px solid var(--accent)}.twisty{background:none;border:none;color:var(--muted);cursor:pointer;width:18px}.twisty.placeholder{cursor:default}.thread-name{flex:1;text-align:left;background:none;border:none;color:var(--text);cursor:pointer;padding:2px 0;font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.link-btn{background:none;border:none;color:var(--muted);cursor:pointer}.crosslinks{font-size:11px}.crosslink{color:var(--accent);cursor:pointer;padding:2px 8px;opacity:.85}.crosslink.in{color:#9ece6a}.main{display:flex;flex-direction:column;min-width:0}.toolbar{display:flex;gap:1rem;align-items:center;padding:.6rem 1rem;border-bottom:1px solid var(--border);background:var(--panel);font-size:13px}.toolbar-title{flex:1;font-weight:600;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.zoom-hint{font-size:11px;color:var(--muted);border:1px solid var(--border);border-radius:4px;padding:2px 6px}.busy{color:var(--accent)}.message-pane{flex:1;overflow-y:auto;padding:1rem}.pane-header{display:flex;align-items:baseline;gap:.75rem;margin-bottom:.5rem;flex-wrap:wrap}.pane-header h2{margin:0;font-size:18px;flex:1}.branch-badge{font-size:11px;color:var(--muted);background:var(--panel);padding:2px 8px;border-radius:10px}.conclusion-toggle{margin-left:auto;background:none;border:1px solid var(--border);color:var(--muted);border-radius:6px;font-size:11px;padding:3px 8px;cursor:pointer;white-space:nowrap}.conclusion-toggle:hover{border-color:var(--accent);color:var(--accent)}.conclusion-toggle.active{background:var(--panel);border-color:var(--accent);color:var(--accent)}.messages{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.75rem}.msg{border-radius:10px;padding:.6rem .8rem;background:var(--panel);border:1px solid var(--border)}.msg.user{background:var(--user)}.msg.assistant{background:var(--assistant)}.msg.system{background:var(--system)}.msg-meta{display:flex;gap:.5rem;font-size:11px;color:var(--muted);text-transform:uppercase;margin-bottom:4px;align-items:center}.msg-body{white-space:pre-wrap;line-height:1.5}.msg.selected{outline:2px solid var(--accent);outline-offset:2px}.msg.collapsed{padding:.4rem .8rem;opacity:.8}.msg.collapsed .msg-body{color:var(--muted)}.conclusion-text{font-style:italic}.msg.load-bearing{border-left:3px solid #e0af68}.load-bearing-tag{color:#e0af68;text-transform:none;font-size:10px}.zoom-btn{margin-left:auto;background:none;border:none;color:var(--muted);cursor:pointer;font-size:13px;padding:0 2px;opacity:.6}.zoom-btn:hover:not(:disabled){opacity:1;color:var(--accent)}.zoom-btn:disabled{cursor:default;opacity:.3}.msg-crosslinks{list-style:none;margin:6px 0 0;padding:0}.msg-crosslink{font-size:11px;color:var(--accent);cursor:pointer;padding:1px 0}.msg-crosslink:hover{text-decoration:underline}.hidden-count{list-style:none;text-align:center;font-size:11px;color:var(--muted);padding:.5rem;background:var(--panel-2);border-radius:6px;border:1px dashed var(--border)}.ancestors{margin-bottom:.75rem}.msg.inherited{opacity:.6;border-style:dashed}.inherited-tag{color:var(--accent)}.branch-divider{list-style:none;text-align:center;font-size:11px;color:var(--muted);margin:.5rem 0;border-top:1px dashed var(--border);padding-top:.5rem}.msg-actions{margin-top:6px}.branch-here{background:none;border:1px solid var(--border);color:var(--accent);border-radius:6px;font-size:11px;padding:2px 8px;cursor:pointer}.branch-here:hover{background:var(--panel-2)}.composer{display:flex;gap:.5rem;padding:.75rem 1rem;border-top:1px solid var(--border);background:var(--panel)}.composer textarea{flex:1;resize:vertical;min-height:44px;background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:8px;font:inherit}.composer button{background:var(--accent);border:none;color:#1a1b26;border-radius:8px;padding:0 1.2rem;cursor:pointer;font-weight:600}.composer button:disabled{opacity:.4;cursor:default}.cross-refs{border-top:1px solid var(--border);padding:.6rem 1rem;background:var(--panel-2)}.cross-refs-title{font-size:11px;text-transform:uppercase;color:var(--muted);letter-spacing:.06em;margin:0 0 .4rem}.cross-refs-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.4rem}.cross-ref{font-size:12px;cursor:pointer;padding:2px 8px;border-radius:4px;border:1px solid var(--border);background:var(--panel)}.cross-ref:hover{border-color:var(--accent)}.cross-ref.out{color:var(--accent)}.cross-ref.in{color:#9ece6a}.temporal-hint{font-size:10px;color:var(--muted);margin:0;padding:4px 10px 2px;letter-spacing:.04em}.thread-group-row .group-label{color:var(--muted);font-style:italic;font-size:12px;flex:1}.graph-panel{border-top:1px solid var(--border)}.graph-panel-header{display:flex;align-items:center;justify-content:space-between;padding:4px 10px;font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}.graph-toggle-btn{background:none;border:1px solid var(--border);color:var(--muted);border-radius:4px;font-size:11px;padding:1px 7px;cursor:pointer;white-space:nowrap}.graph-toggle-btn:hover,.graph-toggle-btn.active{border-color:var(--accent);color:var(--accent)}.graph-view{display:block;width:100%;height:220px;background:var(--bg)}.graph-edge{stroke-width:1.5;pointer-events:none}.parent-edge{stroke:var(--muted)}.cross-edge{stroke:#e0af68;stroke-dasharray:5 3}.graph-node{cursor:pointer}.graph-node circle{fill:var(--panel);stroke:var(--muted);stroke-width:1.5}.graph-node:hover circle,.graph-node:focus circle{stroke:var(--accent)}.graph-node.graph-node-active circle{fill:var(--panel-2);stroke:var(--accent);stroke-width:2.5}.graph-label{fill:var(--text);font-size:10px;pointer-events:none}