:root { color-scheme: dark; }
* { box-sizing: border-box; }
body {
  margin: 0; padding: 1rem; background: #000; color: #fff;
  font: 1.25rem/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
main, footer { max-width: 44rem; margin: 0 auto; }
h1 { font-size: 2.25rem; margin: 0.5rem 0; }
h2 { font-size: 1.5rem; margin: 1.75rem 0 0.5rem; }
.big-button {
  display: block; width: 100%; min-height: 5rem; padding: 1rem;
  font: inherit; font-size: 1.6rem; font-weight: 700;
  color: #000; background: #ffd400; border: 4px solid #fff; border-radius: 0.75rem; cursor: pointer;
}
.big-button[data-playing="true"] { background: #fff; }
.big-button:focus-visible { outline: 4px solid #4fc3ff; outline-offset: 4px; }
.announcer { margin-top: 0.75rem; font-weight: 600; }
.alerts { padding-left: 1.5rem; }
.alerts li { margin: 0 0 1rem; padding-bottom: 1rem; border-bottom: 1px solid #888; }
.alerts .meta { display: block; font-weight: 700; }
footer { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid #888; }
.demo-button { background: #9fe0ff; }
.demo-button[data-playing="true"] { background: #fff; }
details summary { cursor: pointer; font-weight: 700; margin: 0.5rem 0; }
.said { padding-left: 1.5rem; }
.said li { margin: 0 0 0.75rem; }
h3 { font-size: 1.25rem; margin: 1.25rem 0 0.5rem; }