:root{--bg: #0f1115;--panel: #171a21;--panel-2: #1f232c;--border: #2a2f3a;--text: #e6e8ec;--muted: #8b93a1;--accent: #6aa3ff;--user: #2b3550;--assistant: #1f232c}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font:15px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.app{display:grid;grid-template-columns:280px 1fr;height:100vh}.sidebar{background:var(--panel);border-right:1px solid var(--border);padding:16px;overflow-y:auto;display:flex;flex-direction:column;gap:8px}.new-chat{width:100%;padding:10px;background:var(--accent);color:#0b1020;border:none;border-radius:8px;font-weight:600;cursor:pointer}.section-title{margin-top:14px;font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}.list{list-style:none;margin:4px 0;padding:0;display:flex;flex-direction:column;gap:4px}.muted{color:var(--muted);font-size:13px}.conv{width:100%;text-align:left;padding:8px 10px;background:transparent;color:var(--text);border:1px solid transparent;border-radius:8px;cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conv:hover{background:var(--panel-2)}.conv.active{background:var(--panel-2);border-color:var(--border)}.upload{display:block;padding:10px;text-align:center;border:1px dashed var(--border);border-radius:8px;color:var(--muted);cursor:pointer;font-size:13px}.upload:hover{border-color:var(--accent);color:var(--text)}.upload.disabled{opacity:.6;cursor:default}.upload input{display:none}.doc{display:flex;justify-content:space-between;gap:8px;padding:4px 0;font-size:13px}.doc-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat{display:flex;flex-direction:column;height:100vh}.chat-header{display:flex;align-items:center;padding:10px 24px;border-bottom:1px solid var(--border);background:var(--panel)}.mode-toggle{display:inline-flex;gap:4px;background:var(--panel-2);padding:4px;border-radius:8px}.mode{padding:6px 12px;background:transparent;color:var(--muted);border:none;border-radius:6px;cursor:pointer;font:inherit}.mode.active{background:var(--accent);color:#0b1020;font-weight:600}.mode:disabled{cursor:default}.tools{display:flex;flex-direction:column;gap:4px;margin-bottom:6px;font-size:13px}.tool{background:var(--panel-2);border:1px solid var(--border);border-radius:8px;padding:6px 10px}.tool summary{cursor:pointer;color:var(--accent)}.tool-body{margin-top:6px}.tool-body .snippet{white-space:pre-wrap;color:var(--muted);font-size:12px;max-height:200px;overflow:auto}.messages{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:16px}.empty{margin:auto;color:var(--muted)}.msg{display:flex;flex-direction:column;max-width:760px}.msg.user{align-self:flex-end;align-items:flex-end}.msg.assistant{align-self:flex-start;align-items:flex-start}.bubble{padding:10px 14px;border-radius:12px;white-space:pre-wrap;word-wrap:break-word}.msg.user .bubble{background:var(--user)}.msg.assistant .bubble{background:var(--assistant);border:1px solid var(--border)}.sources{margin-top:6px;font-size:13px;color:var(--muted)}.sources summary{cursor:pointer}.sources ul{margin:6px 0 0;padding-left:16px}.sources .snippet{color:var(--muted);font-size:12px}.composer{display:flex;gap:8px;padding:16px 24px;border-top:1px solid var(--border);background:var(--panel)}.composer textarea{flex:1;resize:none;padding:10px 12px;background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:8px;font:inherit}.composer button{padding:0 20px;background:var(--accent);color:#0b1020;border:none;border-radius:8px;font-weight:600;cursor:pointer}.composer button:disabled{opacity:.5;cursor:default}