:root{--bg: #f8fafc;--panel: #ffffff;--border: #e2e8f0;--brand: #2563eb;--brand-ink: #1e3a8a;--text: #0f172a;--muted: #64748b;--user-bubble: #2563eb;--assistant-bubble: #f1f5f9}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:system-ui,-apple-system,Segoe UI,sans-serif;color:var(--text);background:var(--bg)}.app{display:flex;flex-direction:column;height:100vh}.topbar{display:flex;align-items:center;gap:12px;padding:0 16px;height:56px;background:var(--panel);border-bottom:1px solid var(--border);flex:0 0 auto}.brand{display:flex;align-items:baseline;gap:8px;min-width:0}.brand-mark{font-weight:700;font-size:20px;color:var(--brand-ink)}.brand-tagline{color:var(--muted);font-size:13px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user{margin-left:auto;display:flex;align-items:center;gap:10px}.user-name{color:var(--muted);font-size:13px;max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.logout{background:none;border:1px solid var(--border);border-radius:8px;padding:6px 12px;cursor:pointer;font-size:13px;color:var(--text)}.logout:hover{background:var(--bg)}.hamburger{display:none;background:none;border:none;font-size:20px;cursor:pointer;padding:4px 8px}.body{display:flex;flex:1 1 auto;min-height:0}.sidebar{flex:0 0 260px;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column;min-height:0}.new-session{margin:12px;padding:10px 12px;border:1px solid var(--brand);background:var(--brand);color:#fff;border-radius:8px;cursor:pointer;font-size:14px;font-weight:600}.new-session:hover{background:#1d4ed8}.thread-list{overflow-y:auto;padding:0 8px 12px;display:flex;flex-direction:column;gap:4px}.thread-item{display:flex;flex-direction:column;gap:2px;text-align:left;background:none;border:none;border-radius:8px;padding:8px 10px;cursor:pointer;color:var(--text)}.thread-item:hover{background:var(--bg)}.thread-item.active{background:#eff6ff}.thread-title{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.thread-date{font-size:11px;color:var(--muted)}.main{flex:1 1 auto;min-width:0;display:flex}.chat{display:flex;flex-direction:column;flex:1 1 auto;min-height:0;max-width:820px;width:100%;margin:0 auto}.messages{flex:1 1 auto;overflow-y:auto;padding:20px 16px;display:flex;flex-direction:column;gap:12px}.muted{color:var(--muted);font-size:14px}.bubble{padding:10px 14px;border-radius:14px;max-width:85%;line-height:1.5}.bubble.user{align-self:flex-end;background:var(--user-bubble);color:#fff;white-space:pre-wrap}.bubble.assistant{align-self:flex-start;background:var(--assistant-bubble);color:var(--text)}.md>:first-child{margin-top:0}.md>:last-child{margin-bottom:0}.md p{margin:8px 0}.md ul,.md ol{margin:8px 0;padding-left:20px}.md li{margin:2px 0}.md code{background:#e2e8f0;padding:1px 5px;border-radius:4px;font-size:.9em}.md pre{background:#0f172a;color:#e2e8f0;padding:12px;border-radius:8px;overflow-x:auto}.md pre code{background:none;padding:0}.md table{border-collapse:collapse;margin:8px 0}.md th,.md td{border:1px solid var(--border);padding:4px 8px}.md a{color:var(--brand)}.error-banner{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0 16px;padding:10px 14px;background:#fef2f2;color:#b91c1c;border:1px solid #fecaca;border-radius:8px;font-size:14px}.error-banner button{background:none;border:none;color:#b91c1c;cursor:pointer;font-weight:600}.composer{display:flex;gap:8px;padding:12px 16px;border-top:1px solid var(--border);background:var(--panel)}.composer input{flex:1;padding:11px 14px;border-radius:10px;border:1px solid var(--border);font-size:15px}.composer input:disabled{background:var(--bg)}.composer button{padding:11px 18px;border-radius:10px;border:none;color:#fff;cursor:pointer;font-size:15px;font-weight:600;background:var(--brand)}.composer button:disabled{opacity:.5;cursor:default}.composer button.stop{background:#64748b}@media(max-width:720px){.hamburger{display:block}.brand-tagline{display:none}.sidebar{position:absolute;top:56px;bottom:0;left:0;z-index:20;transform:translate(-100%);transition:transform .2s ease;box-shadow:2px 0 8px #0000001a}.body.sidebar-open .sidebar{transform:translate(0)}}