body { font-family: system-ui, sans-serif; margin: 0; padding: 12px; }
main { display: grid; gap: 12px; max-width: 960px; }
form { display: grid; gap: 6px; }
.actions { display: flex; gap: 8px; }
#frame iframe { width: 100%; height: 70vh; border: 1px solid #888; }