body { font-family: system-ui, sans-serif; margin: 0; background: #f6f7f9; color: #1d2433; }
main { max-width: 720px; margin: 48px auto; padding: 24px; background: #fff; border-radius: 8px; box-shadow: 0 1px 3px rgba(0, 0, 0, .1); }
textarea { width: 100%; box-sizing: border-box; font-family: ui-monospace, monospace; font-size: 12px; word-break: break-all; }
button { margin-top: 8px; padding: 8px 16px; font-size: 14px; cursor: pointer; }
#api-list { list-style: none; padding: 0; }
.hint { color: #5b6475; font-size: 14px; }
.error { color: #b42318; }