:root{color-scheme:dark;font-family:Arial,sans-serif;background:#101827;color:#e8eef8}body{margin:0}main{max-width:900px;margin:3rem auto;padding:0 1.25rem}button,input,select{font:inherit;padding:.55rem}label{display:grid;grid-gap:.4rem;gap:.4rem}.card,label{margin:1rem 0}.card{background:#1c2738;border:1px solid #334155;border-radius:.6rem;padding:1rem}.error{color:#fecaca}.muted{color:#aab8cc}nav{display:flex;gap:1rem;flex-wrap:wrap}