:root{--bg:#0f1115;--bg-elev:#171a21;--bg-input:#1f242d;--border:#2a2f3a;--text:#e6e8ec;--text-muted:#8b93a3;--accent:#4f8cff;--accent-hover:#6aa0ff;--user-bubble:#2b3a5a;--assistant-bubble:#1f242d;--error:#ff6b6b;--radius:12px}*{box-sizing:border-box}html,body{background:var(--bg);height:100%;color:var(--text);margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Helvetica Neue,sans-serif;font-size:16px;line-height:1.5}button,input,textarea,select{font-family:inherit;font-size:inherit;color:inherit}.app{flex-direction:column;max-width:900px;height:100dvh;margin:0 auto;display:flex}.header{border-bottom:1px solid var(--border);background:var(--bg-elev);justify-content:space-between;align-items:center;padding:12px 16px;display:flex}.header h1{margin:0;font-size:1.1rem;font-weight:600}.header .actions{gap:8px;display:flex}.icon-btn{border:1px solid var(--border);color:var(--text);cursor:pointer;background:0 0;border-radius:8px;padding:6px 12px;transition:background .15s}.icon-btn:hover{background:var(--bg-input)}.messages{flex-direction:column;flex:1;gap:12px;padding:16px;display:flex;overflow-y:auto}.empty{color:var(--text-muted);text-align:center;margin-top:32px;font-size:.95rem}.msg{border-radius:var(--radius);white-space:pre-wrap;word-wrap:break-word;flex-direction:column;max-width:80%;padding:10px 14px;display:flex}.msg.user{background:var(--user-bubble);border-bottom-right-radius:4px;align-self:flex-end}.msg.assistant{background:var(--assistant-bubble);border:1px solid var(--border);border-bottom-left-radius:4px;align-self:flex-start}.msg .role{color:var(--text-muted);margin-bottom:4px;font-size:.75rem}.msg.error{max-width:100%;color:var(--error);background:rgba(255,107,107,.12);border:1px solid rgba(255,107,107,.35);align-self:stretch}.typing{color:var(--text-muted);font-style:italic}.composer{border-top:1px solid var(--border);background:var(--bg-elev);gap:8px;padding:12px;display:flex}.composer textarea{resize:none;background:var(--bg-input);border:1px solid var(--border);border-radius:10px;outline:none;flex:1;min-height:44px;max-height:200px;padding:10px 12px}.composer textarea:focus{border-color:var(--accent)}.composer button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:10px;padding:0 18px;font-weight:600;transition:background .15s}.composer button:hover:not(:disabled){background:var(--accent-hover)}.composer button:disabled{opacity:.5;cursor:not-allowed}.settings-overlay{z-index:10;background:rgba(0,0,0,.55);justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.settings{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);width:100%;max-width:600px;max-height:90dvh;padding:20px;overflow-y:auto}.settings h2{margin:0 0 16px;font-size:1.15rem}.field{flex-direction:column;margin-bottom:14px;display:flex}.field label{color:var(--text-muted);margin-bottom:4px;font-size:.85rem}.field input,.field textarea{background:var(--bg-input);border:1px solid var(--border);border-radius:8px;outline:none;padding:8px 10px}.field input:focus,.field textarea:focus{border-color:var(--accent)}.field textarea{resize:vertical;min-height:90px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9rem}.field-hint{color:var(--text-muted);margin-top:4px;font-size:.78rem}.settings-actions{justify-content:flex-end;gap:8px;margin-top:16px;display:flex}.settings-actions .primary{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:8px 16px;font-weight:600}.settings-actions .primary:hover{background:var(--accent-hover)}.status-banner{color:var(--accent);border-bottom:1px solid var(--border);background:rgba(79,140,255,.12);padding:8px 12px;font-size:.85rem}.status-banner.ok{color:#6fcf97;background:rgba(80,200,120,.12)}.status-banner.err{color:var(--error);background:rgba(255,107,107,.12)}@media (width<=640px){.msg{max-width:92%}.header h1{font-size:1rem}}