/* Hide only the unfinished simulator; never briefly expose the legacy layout. */
html:not([data-style-ready]) main{visibility:hidden}
#style-startup{margin:30px auto;padding:24px;max-width:720px;color:#e4f3fa;background:#193747;border-radius:12px}
html[data-style-ready] #style-startup{display:none}
#style-startup button{margin-top:12px}