:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: #fafafa;
  color: #1a1a1a;
}
main { max-width: 34rem; margin: 0 auto; padding: 3rem 1.25rem; }
h1 { font-size: 1.6rem; margin: 0 0 .5rem; }
.lede { color: #555; margin: 0 0 1.75rem; }
form.subscribe { display: flex; flex-direction: column; gap: .75rem; }
label { font-weight: 600; font-size: .9rem; }
input[type=email] {
  padding: .7rem .8rem; font-size: 1rem; border: 1px solid #ccc;
  border-radius: 8px; background: #fff; color: inherit;
}
input[type=email]:focus { outline: 2px solid #3b82f6; border-color: transparent; }
button {
  padding: .7rem 1rem; font-size: 1rem; font-weight: 600; cursor: pointer;
  border: 0; border-radius: 8px; background: #111; color: #fff;
}
button:hover { background: #333; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.fine { color: #888; font-size: .8rem; margin-top: 1rem; }
.notice { padding: .8rem 1rem; border-radius: 8px; margin: 0 0 1.5rem; font-size: .95rem; }
.notice.ok { background: #e7f6ec; color: #14532d; }
.notice.err { background: #fdecec; color: #7f1d1d; }
@media (prefers-color-scheme: dark) {
  body { background: #111; color: #eee; }
  .lede { color: #aaa; }
  input[type=email] { background: #1c1c1c; border-color: #444; }
  button { background: #eee; color: #111; }
  button:hover { background: #ccc; }
  .notice.ok { background: #14311f; color: #bbf7d0; }
  .notice.err { background: #3a1a1a; color: #fecaca; }
}