:root{--bg:#0e1116;--panel:#161b22;--border:#2a313c;--text:#e6edf3;--muted:#8b949e;--accent:#6e8efb;--accent-2:#a777e3;--user-bubble:#1f6feb22}*{box-sizing:border-box}body,html{margin:0;padding:0;height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.app{max-width:820px;margin:0 auto;display:flex;flex-direction:column;height:100vh;padding:0 16px}header.brand{padding:24px 4px 12px}header.brand h1{margin:0;font-size:22px;background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}header.brand p{margin:4px 0 0;color:var(--muted);font-size:13px}.messages{flex:1 1;overflow-y:auto;gap:18px;padding:16px 0}.messages,.msg{display:flex;flex-direction:column}.msg{gap:8px}.msg .role{font-size:12px;color:var(--muted)}.bubble{padding:12px 14px;border-radius:12px;line-height:1.55;white-space:pre-wrap;word-wrap:break-word}.msg.user .bubble{background:var(--user-bubble);border:1px solid var(--border);align-self:flex-end;max-width:80%}.msg.assistant .bubble{background:var(--panel);border:1px solid var(--border)}.sources{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}.sources a,.sources span{font-size:12px;color:var(--muted);border:1px solid var(--border);border-radius:999px;padding:3px 10px;text-decoration:none}.sources a:hover{color:var(--text);border-color:var(--accent)}.composer{display:flex;gap:8px;padding:12px 0 24px}.composer textarea{flex:1 1;resize:none;background:var(--panel);border:1px solid var(--border);border-radius:10px;color:var(--text);padding:12px 14px;font-size:15px;font-family:inherit;min-height:48px;max-height:160px}.composer textarea:focus{outline:none;border-color:var(--accent)}.composer button{background:linear-gradient(90deg,var(--accent),var(--accent-2));border:none;border-radius:10px;color:white;font-weight:600;padding:0 20px;cursor:pointer}.composer button:disabled{opacity:.5;cursor:default}.empty{color:var(--muted);text-align:center;margin-top:15vh}.empty .examples{display:flex;flex-direction:column;gap:8px;margin-top:16px;align-items:center}.empty .examples button{background:var(--panel);border:1px solid var(--border);color:var(--text);border-radius:999px;padding:8px 16px;cursor:pointer;font-size:14px}.empty .examples button:hover{border-color:var(--accent)}.cursor{display:inline-block;width:8px;background:var(--accent);animation:blink 1s steps(2) infinite}@keyframes blink{0%,50%{opacity:1}50.01%,to{opacity:0}}