body { font-family: system-ui, Arial, sans-serif; margin: 2rem; max-width: 760px; }
header { margin-bottom: 1.5rem; }
form { display: flex; flex-direction: column; gap: 0.75rem; }
input, textarea { padding: 0.5rem; font-size: 1rem; }
button { background: #2563eb; color: #fff; border: none; padding: 0.6rem 1rem; font-size: 1rem; cursor: pointer; }
button:hover { background: #1e4fb7; }
pre { background: #f6f8fa; padding: 1rem; overflow: auto; }
footer { margin-top: 3rem; font-size: 0.85rem; color: #6b7280; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }