* { box-sizing: border-box; font-family: system-ui, sans-serif; }
body { margin: 0; padding: 1rem; font-family: system-ui, sans-serif; }
header { background: #1a73e8; color: #fff; padding: 1rem; margin: -1rem -1rem 1rem; }
input, button { display: block; width: 100%; margin: 0.5rem 0; padding: 0.75rem; font-size: 1rem; }
button { background: #1a73e8; color: #fff; border: 0; border-radius: 4px; cursor: pointer; }
button:disabled { opacity: 0.5; }
#status { padding: 0.5rem; background: #e8f0fe; border-radius: 4px; margin-bottom: 0.5rem; }