:root {
  color-scheme: light dark;
  --paper: #f6f5f2; --surface: #fff; --ink: #252326; --muted: #66616b;
  --accent: #6b43c8; --line: #ded9e5; --tint: #f2edf9; --danger: #a82d3c;
  font: 100%/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--paper); color: var(--ink);
}
* { box-sizing: border-box; }
body { margin: 0; padding: 32px 20px; }
main { max-width: 620px; margin: auto; }
.eyebrow { color: var(--muted); font-size: .85rem; letter-spacing: .04em; }
h1 { font-size: clamp(2rem, 6vw, 3.3rem); line-height: 1.1; letter-spacing: -.04em; margin: 28px 0 20px; }
h2 { font-size: 1.15rem; line-height: 1.3; margin: 0 0 18px; }
h3 { font-size: 1rem; margin: 0 0 8px; }
p { margin: 0 0 16px; }
.intro { color: var(--muted); font-size: 1.1rem; }
section { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 24px; margin: 24px 0; }
ul { padding-left: 20px; margin: 0 0 24px; }
li + li { margin-top: 12px; }
.billing { padding: 18px; border-radius: 12px; background: var(--tint); }
.links { display: flex; flex-wrap: wrap; gap: 12px 24px; }
a { color: var(--accent); text-underline-offset: 3px; overflow-wrap: anywhere; }
label { display: block; margin-bottom: 6px; font-weight: 600; }
input { width: 100%; min-height: 50px; padding: 12px; margin-bottom: 18px; font: inherit;
  color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 10px; }
button { display: block; width: 100%; min-height: 50px; margin-top: 12px; padding: 12px 16px; border: 0;
  border-radius: 12px; font: inherit; font-weight: 600; color: #fff; background: var(--accent); cursor: pointer; }
button.secondary { color: var(--accent); background: var(--tint); }
button.destructive { background: var(--danger); }
button:disabled { opacity: .6; cursor: wait; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
#status { margin: 18px 0 0; overflow-wrap: anywhere; }
footer { margin: 32px 0; }
[hidden] { display: none !important; }
@media (prefers-color-scheme: dark) {
  :root { --paper: #17151d; --surface: #24212c; --ink: #f4f0fa; --muted: #c2bacd;
    --accent: #c2a5ff; --line: #4e455e; --tint: #332c40; --danger: #ae3046; }
  button:not(.secondary):not(.destructive) { color: #25163d; }
}
@media (max-width: 400px) { body { padding: 20px 14px; } section { padding: 20px 16px; } }