body{margin:0;font-family:system-ui,sans-serif}.center{place-items:center;min-height:100vh;display:grid}.topbar{border-bottom:1px solid #e5e7eb;align-items:center;gap:16px;padding:8px 24px;display:flex}.brand{color:inherit;font-weight:700;text-decoration:none}.spacer{flex:1}.content{padding:24px}