:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}body{margin:0}.shell{color:#1f2933;max-width:720px;margin:0 auto;padding:2rem 1.5rem;font-family:system-ui,sans-serif}header h1{margin-bottom:.25rem;font-size:1.75rem}.subtitle{color:#52606d}.placeholder{background:#f8fafc;border:1px dashed #9aa5b1;border-radius:8px;margin-top:2rem;padding:1.25rem}.sample code{word-break:break-all}