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:#16315f;color:#fff}.topbar nav{display:flex;gap:12px}.topbar nav button{cursor:pointer;border:1px solid #9cc0ff;background:transparent;color:#9cc0ff;padding:6px 14px;border-radius:4px}.topbar nav button.active{background:#9cc0ff;color:#16315f}.topbar .broadcast{margin-left:auto;cursor:pointer;padding:6px 14px;border-radius:4px;border:none}.viewport{padding:20px}