:root{font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:#0d1117;color:#f3f4f6}
*{box-sizing:border-box}body{margin:0;min-height:100vh;background:linear-gradient(180deg,#0d1117,#131a22)}
.shell{max-width:760px;margin:0 auto;padding:32px 16px}.card{background:#161d26;border:1px solid #2a3441;border-radius:18px;padding:24px;box-shadow:0 18px 50px rgba(0,0,0,.25)}
.hidden{display:none!important}.brand{font-weight:800;letter-spacing:.04em;color:#f6c744;text-transform:uppercase;font-size:.82rem}h1{margin:.35rem 0 1rem;font-size:1.65rem}
p{color:#cbd5e1;line-height:1.5}label{display:block;margin:18px 0 8px;font-weight:650}input,textarea{width:100%;background:#0e141b;color:#fff;border:1px solid #384657;border-radius:12px;padding:13px;font:inherit}
textarea{resize:vertical}button{border:0;border-radius:11px;background:#f6c744;color:#121820;font-weight:800;padding:11px 16px;cursor:pointer}button:disabled{opacity:.55;cursor:not-allowed}.ghost{background:#26313e;color:#e5e7eb}
.chatHeader,.actions{display:flex;align-items:center;justify-content:space-between;gap:12px}.notice{background:#202a35;border-left:4px solid #f6c744;padding:12px 14px;border-radius:8px;margin:16px 0;color:#dbe4ee}
.messages{height:430px;overflow:auto;padding:14px 4px;display:flex;flex-direction:column;gap:12px}.bubble{max-width:85%;padding:12px 14px;border-radius:14px;white-space:pre-wrap;line-height:1.45}.bubble.user{align-self:flex-end;background:#304154}.bubble.agent{align-self:flex-start;background:#232d38;border:1px solid #344252}.bubble small{display:block;margin-top:7px;color:#9aa8b7;font-size:.75rem}
.composer{border-top:1px solid #2a3441;padding-top:14px}.actions{margin-top:10px}.status{color:#aab7c5;font-size:.9rem}.evalLink{display:inline-block;margin-top:18px;color:#f6c744}.card form button[type=submit]{margin-top:12px}
@media(max-width:560px){.shell{padding:12px}.card{padding:16px}.messages{height:55vh}.chatHeader{align-items:flex-start}.actions{flex-wrap:wrap}}