:root{color:#111;background:#fff;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}body{margin:0}.shell{flex-direction:column;min-height:100vh;display:flex}.env-banner{z-index:1000;color:#000;text-align:center;letter-spacing:.02em;background:#ffd400;border-bottom:4px solid #000;padding:10px 16px;font-size:1.05rem;font-weight:700;position:sticky;top:0}.content{box-sizing:border-box;flex:1;width:100%;max-width:960px;margin:0 auto;padding:24px 16px}.footer{color:#444;border-top:1px solid #ccc;flex-wrap:wrap;gap:16px;padding:8px 16px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.8rem;display:flex}