:root{--bg: #ffffff;--bg-sidebar: #f7f7f8;--bg-input: #ffffff;--bg-bubble-user: #e8f0fe;--bg-bubble-assistant: #f1f1f3;--bg-bubble-tool: #fff8e1;--text: #1f1f1f;--text-muted: #6b6b6b;--border: #e3e3e3;--accent: #2563eb;--accent-text: #ffffff;--danger: #dc2626}@media(prefers-color-scheme:dark){:root{--bg: #1a1a1e;--bg-sidebar: #111114;--bg-input: #232327;--bg-bubble-user: #26374d;--bg-bubble-assistant: #2a2a2e;--bg-bubble-tool: #33301f;--text: #ececec;--text-muted: #9a9a9a;--border: #303034;--accent: #3b82f6;--accent-text: #ffffff;--danger: #f87171}}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Pretendard,Roboto,sans-serif;background:var(--bg);color:var(--text)}.app-shell{display:flex;height:100vh;overflow:hidden}.sidebar{width:260px;min-width:200px;background:var(--bg-sidebar);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0}.sidebar-header{padding:12px;display:flex;align-items:center;gap:8px}.new-chat-btn{flex:1;min-width:0;padding:10px 12px;border-radius:8px;border:1px solid var(--border);background:transparent;color:var(--text);cursor:pointer;font-size:14px;text-align:left}.new-chat-btn:hover{background:var(--bg-bubble-assistant)}.sidebar-close-btn{display:none;flex-shrink:0}.session-list{flex:1;overflow-y:auto;padding:0 8px}.session-group-label{font-size:11px;color:var(--text-muted);padding:12px 8px 4px;text-transform:uppercase}.session-item{padding:8px 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