:root {
  --bg: #faf9f7; --surface: #ffffff; --text: #1c1917; --muted: #6b6560; --line: #e7e3de;
  --accent: #1c1917; --accent-text: #ffffff; --focus: #2563eb; --ok: #166534; --error: #b91c1c;
  --check: #1c1917;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161514; --surface: #1f1e1c; --text: #f2efeb; --muted: #a39e98; --line: #34312e;
    --accent: #f2efeb; --accent-text: #161514; --focus: #60a5fa; --ok: #4ade80; --error: #f87171; --check: #f2efeb;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}
main { max-width: 640px; margin: 0 auto; padding: 56px 16px 40px; }
a { color: inherit; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, input:focus-visible, label:has(input:focus-visible) {
  outline: 2px solid var(--focus); outline-offset: 2px;
}
.brand { font-size: 13px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; color: var(--muted);
  text-decoration: none; }
h1 { font-size: clamp(30px, 6vw, 40px); line-height: 1.15; letter-spacing: -.02em; margin: 18px 0 20px; }
h2 { font-size: 15px; font-weight: 600; color: var(--muted); margin: 40px 0 12px; }
p { margin: 0 0 16px; }
.note { color: var(--text); }
.sig { color: var(--muted); }
.cards { display: grid; gap: 12px; margin: 0 0 24px; padding: 0; border: 0; }
.card { display: grid; grid-template-columns: 24px 1fr; gap: 4px 14px; padding: 18px 18px 16px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px; cursor: pointer; }
.card:has(input:checked) { border-color: var(--text); }
.card input { width: 20px; height: 20px; margin: 3px 0 0; accent-color: var(--check); cursor: pointer; }
.card .name { font-weight: 650; font-size: 18px; }
.card.single { grid-template-columns: 1fr; cursor: default; }
.card.single .about, .card.single .sample { grid-column: 1; }
.card .when { color: var(--muted); font-size: 14px; }
.card .about { grid-column: 2; color: var(--muted); font-size: 15px; margin: 4px 0 0; }
.card .sample { grid-column: 2; font-size: 15px; margin-top: 6px; }
.signup { display: flex; gap: 10px; flex-wrap: wrap; }
.signup input[type=email] { flex: 1 1 240px; min-width: 0; font: inherit; padding: 12px 14px; color: var(--text);
  background: var(--surface); border: 1px solid var(--line); border-radius: 10px; }
button { font: inherit; font-weight: 600; padding: 12px 20px; border: 0; border-radius: 10px; cursor: pointer;
  background: var(--accent); color: var(--accent-text); }
button:disabled { opacity: .6; cursor: default; }
.secondary { background: transparent; color: var(--text); border: 1px solid var(--line); }
.fine { color: var(--muted); font-size: 14px; margin-top: 14px; }
.status { min-height: 1.6em; margin: 14px 0 0; }
.status:empty { min-height: 0; margin: 0; }
.status.ok { color: var(--ok); }
.status.error { color: var(--error); }
.done { padding: 22px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.done h2 { color: var(--text); font-size: 20px; margin: 0 0 8px; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
footer { max-width: 640px; margin: 0 auto; padding: 24px 16px 48px; color: var(--muted); font-size: 14px;
  border-top: 1px solid var(--line); }
footer p { margin: 0 0 6px; }
[hidden] { display: none !important; }