:root {
  color-scheme: light dark;
  --bg: #fafafa;
  --fg: #171717;
  --muted: #5f5f5f;
  --line: #d4d4d4;
  --accent: #171717;
  --accent-fg: #fafafa;
  --error: #b42318;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --fg: #fafafa;
    --muted: #a3a3a3;
    --line: #333;
    --accent: #fafafa;
    --accent-fg: #0a0a0a;
    --error: #f97066;
  }
}
body { margin: 0; background: var(--bg); color: var(--fg); }
/* `hidden` must win over the display rules below (form is a grid). */
[hidden] { display: none !important; }
main { max-width: 32rem; margin: 0 auto; padding: 3rem 1rem; }
h1 { font-size: 1.6rem; margin: 0 0 .5rem; }
.lead, .hint { color: var(--muted); }
.hint { font-size: .85rem; margin-top: .25rem; }
form { display: grid; gap: .5rem; margin-top: 1.5rem; }
label { font-size: .9rem; font-weight: 600; margin-top: .5rem; }
input:not([type=radio]):not([type=checkbox]), textarea {
  font: inherit; padding: .55rem .7rem; border: 1px solid var(--line); border-radius: .5rem;
  background: transparent; color: inherit;
}
fieldset { border: 1px solid var(--line); border-radius: .5rem; padding: .5rem .75rem; margin: .5rem 0 0; }
legend { font-size: .9rem; font-weight: 600; padding: 0 .25rem; }
.choice { display: flex; gap: .5rem; align-items: flex-start; font-weight: 400; }
#paid, .billing { display: grid; gap: .5rem; }
.row { display: grid; grid-template-columns: 1fr 2fr; gap: .75rem; }
.row > div { display: grid; gap: .5rem; }
.consent { margin-top: 1rem; }
a { color: inherit; }
button, .button {
  margin-top: 1rem; font: inherit; font-weight: 600; padding: .65rem 1rem; border: 0;
  border-radius: .5rem; background: var(--accent); color: var(--accent-fg); cursor: pointer;
  text-decoration: none; display: inline-block;
}
button:disabled { opacity: .5; cursor: progress; }
#status.error { color: var(--error); }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.doc h2 { font-size: 1.1rem; margin: 1.75rem 0 .5rem; }
.doc li { margin-bottom: .4rem; }
.doc p, .doc li { line-height: 1.5; }