body{margin:0;font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.topbar{display:flex;gap:16px;align-items:center;padding:12px 20px;background:#b0111f;color:#fff}.topbar nav{display:flex;gap:8px}.topbar nav button{border:1px solid #ffb3ba;background:transparent;color:#ffd9dc;padding:4px 12px;border-radius:4px;cursor:pointer}.topbar nav button.active{background:#fff;color:#b0111f;font-weight:600}.topbar .send{margin-left:auto;cursor:pointer;padding:4px 12px;border-radius:4px;border:none}.viewport{padding:20px}