body{font-family:system-ui,sans-serif;background:#111;color:#fff;text-align:center;padding:2rem}
.container{max-width:720px;margin:0 auto}
.card{background:#1b1b1b;padding:1rem;border-radius:12px;margin:1rem 0}
input,button{padding:.6rem;margin:.3rem}
pre{background:#222;padding:1rem;overflow:auto;text-align:left}
.small{opacity:.75}
code{background:#222;padding:.15rem .35rem;border-radius:6px}