:root{color-scheme:light;--bg: #f6f7f4;--panel: #ffffff;--panel-soft: #eef2ed;--text: #1c211e;--muted: #657169;--line: #d9dfd9;--accent: #2d6d63;--accent-soft: #dcefeb;--code-bg: #18211f;--code-text: #e6f2ee;font-family:Aptos,Avenir Next,Helvetica Neue,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}:root[data-theme=dark]{color-scheme:dark;--bg: #101312;--panel: #171b1a;--panel-soft: #202725;--text: #edf3ef;--muted: #9aa8a1;--line: #2c3431;--accent: #7ad2bf;--accent-soft: #203b36;--code-bg: #070908;--code-text: #dce9e5}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);text-rendering:optimizeLegibility}button,input{font:inherit}.app-shell{--sidebar-width: 340px;display:grid;grid-template-columns:var(--sidebar-width) 8px minmax(0,1fr);height:100vh;overflow:hidden}.sidebar{background:var(--panel);min-height:0;display:flex;flex-direction:column}.splitter{cursor:col-resize;background:linear-gradient(to 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0;max-width:70vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.actions{display:flex;gap:12px;align-items:center;white-space:nowrap}.actions label,.actions button{border:1px solid var(--line);background:var(--panel);color:var(--text);border-radius:6px;padding:8px 10px;display:flex;gap:8px;align-items:center}.actions button{cursor:pointer}.content-scroll{padding:26px 34px 80px}.timeline{max-width:1120px;margin:0 auto;display:grid;gap:24px}.event-row{display:grid;grid-template-columns:34px minmax(0,1fr);gap:14px;align-items:start}.event-icon{width:30px;height:30px;display:grid;place-items:center;border-radius:6px;background:var(--panel-soft);color:var(--muted);position:sticky;top:18px;text-decoration:none}.event-icon:hover{outline:2px solid var(--accent);outline-offset:2px}.event-row.focused article{outline:2px solid var(--accent);outline-offset:10px;border-radius:6px}.event-row.user .event-icon{color:#2d6d63}.event-row.assistant .event-icon{color:#6a5acd}.event-row.tool 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var(--line)}.empty-state{color:var(--muted);display:grid;place-items:center;min-height:50vh}@media(max-width:850px){.app-shell{grid-template-columns:1fr;grid-template-rows:260px minmax(0,1fr)}.sidebar{border-right:0;border-bottom:1px solid var(--line)}.splitter{display:none}.viewer-header{align-items:flex-start;flex-direction:column}.content-scroll{padding:20px 16px 60px}}