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:root{--bg:#f7f8fa;--surface:#fff;--border:#e6e8ec;--text:#1a1d24;--muted:#6b7280;--primary:#2563eb;--primary-hover:#1d4ed8;--primary-soft:#eff4ff;--user-bubble:#2563eb;--danger:#dc2626;--radius:12px;--shadow:0 1px 3px #1018280f, 0 1px 2px #1018280a}*{box-sizing:border-box}html,body{height:100%;margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:var(--font-geist-sans), system-ui, -apple-system, sans-serif;font-size:15px;line-height:1.55}button{cursor:pointer;border:none;border-radius:8px;font-family:inherit;font-weight:600;transition:background .15s,opacity .15s}button:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff;padding:10px 18px}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-ghost{color:var(--muted);border:1px solid var(--border);background:0 0;padding:8px 12px}.btn-ghost:hover{background:var(--bg);color:var(--text)}input{border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:8px;outline:none;width:100%;padding:11px 13px;font-family:inherit;font-size:15px;transition:border-color .15s,box-shadow .15s}input:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-soft)}.auth-wrap{place-items:center;min-height:100vh;padding:24px;display:grid}.auth-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);width:100%;max-width:380px;box-shadow:var(--shadow);padding:32px}.brand{align-items:center;gap:10px;margin-bottom:4px;font-size:18px;font-weight:700;display:flex}.brand-dot{background:var(--primary);width:12px;height:12px;box-shadow:0 0 0 4px var(--primary-soft);border-radius:50%}.auth-sub{color:var(--muted);margin:0 0 22px;font-size:14px}.field{margin-bottom:12px}.error{color:var(--danger);margin:4px 0 12px;font-size:13px}.link{color:var(--primary);text-align:center;cursor:pointer;margin-top:16px;font-size:14px}.shell{flex-direction:column;height:100vh;display:flex}.topbar{background:var(--surface);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:14px 20px;display:flex}.layout{flex:1;grid-template-columns:300px 1fr;min-height:0;display:grid}.sidebar{background:var(--surface);border-right:1px solid var(--border);padding:18px;overflow-y:auto}.sidebar h2{text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin:4px 0 12px;font-size:13px}.source-row{gap:8px;margin-bottom:10px;display:flex}.upload-label{text-align:center;border:1px dashed var(--border);color:var(--muted);cursor:pointer;border-radius:8px;margin-bottom:14px;padding:14px;font-size:14px;transition:border-color .15s,color .15s;display:block}.upload-label:hover{border-color:var(--primary);color:var(--primary)}.hint{color:var(--muted);min-height:18px;margin:6px 0 14px;font-size:13px}.doc-item{border:1px solid var(--border);border-radius:8px;justify-content:space-between;align-items:center;gap:8px;margin-bottom:8px;padding:9px 11px;font-size:13px;display:flex}.doc-name{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.tag{background:var(--primary-soft);color:var(--primary);border-radius:999px;flex-shrink:0;padding:2px 7px;font-size:11px;font-weight:600}.tag.web{color:#059669;background:#ecfdf5}.tag.chat{color:#d92d20;background:#fef3f2}.del{color:var(--muted);background:0 0;border:none;padding:0 4px;font-size:16px;line-height:1}.del:hover{color:var(--danger)}.chat{background:var(--bg);flex-direction:column;min-height:0;display:flex}.messages{flex-direction:column;flex:1;gap:16px;padding:24px;display:flex;overflow-y:auto}.empty{text-align:center;color:var(--muted);margin:auto}.empty .big{color:var(--text);margin-bottom:6px;font-size:17px;font-weight:600}.row{display:flex}.row.user{justify-content:flex-end}.bubble{white-space:pre-wrap;word-wrap:break-word;border-radius:14px;max-width:76%;padding:12px 15px}.row.user .bubble{background:var(--user-bubble);color:#fff;border-bottom-right-radius:4px}.row.assistant .bubble{background:var(--surface);border:1px solid var(--border);border-bottom-left-radius:4px}.citations{flex-wrap:wrap;gap:6px;margin-top:8px;display:flex}.chip{background:var(--primary-soft);color:var(--primary);border-radius:999px;padding:3px 9px;font-size:12px}.typing{color:var(--muted);font-style:italic}.composer{border-top:1px solid var(--border);background:var(--surface);gap:10px;padding:16px 24px;display:flex}@media (max-width:760px){.layout{grid-template-columns:1fr}.sidebar{display:none}}