:root { font-family: system-ui, sans-serif; line-height: 1.4; }
main { max-width: 40rem; margin: 2rem auto; padding: 0 1rem; }
.channel { border: 1px solid #ccc; border-radius: 8px; padding: 1rem; margin: 0.75rem 0; }
.channel h3 { margin: 0 0 0.25rem; }
.btn, button { cursor: pointer; padding: 0.5rem 0.9rem; border-radius: 6px; border: 1px solid #888; background: #f4f4f4; }
.warn { color: #a00; font-weight: 600; }
dialog { max-width: 32rem; border-radius: 10px; }
code { background: #f0f0f0; padding: 0.1rem 0.3rem; border-radius: 4px; }
.qr { margin-top: 0.5rem; }