:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #16181d;
  --muted: #5b616e;
  --border: #d9dce3;
  --accent: #1f5eff;
  --error: #b42318;
  --danger: #b42318; /* destructive buttons, white text: 6.6:1 */
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #181b21;
    --text: #eceef2;
    --muted: #9aa1ae;
    --border: #2c313b;
    --accent: #6b93ff;
    --error: #ff8a80;
    --danger: #d92d20; /* white text: 4.8:1 */
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 48px 16px;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 24px;
}
h1 { margin: 0 0 4px; font-size: 1.6rem; }
h2 { font-size: 1.15rem; margin: 24px 0 8px; }
h3 { font-size: 1rem; margin: 22px 0 6px; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.85rem; word-break: break-all; }
.stack { display: flex; flex-direction: column; gap: 10px; }
.row { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; }
.row input { flex: 1 1 160px; }
.list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.list li { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; margin: 0; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }
input, select {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: inherit;
}
button {
  font: inherit;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
button.secondary { background: transparent; color: var(--accent); margin-top: 24px; }
button.link { background: none; border: none; color: var(--accent); padding: 4px; }
button.danger { background: var(--danger); border-color: var(--danger); }
#delete-start { display: block; margin-top: 8px; }
button.provider { width: 100%; padding: 12px; font-weight: 600; }
button.provider.apple { background: #000; border-color: #000; }
button.provider.google { background: #fff; color: #1f1f1f; border-color: #747775; }
.notice { padding: 10px 12px; border-radius: 8px; border: 1px solid var(--border); }
.notice.error { color: var(--error); border-color: var(--error); }
/* The hidden attribute must win over display rules such as .row { display: flex }. */
[hidden] { display: none !important; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.claim { border: 1px solid var(--border); border-radius: 10px; padding: 4px 14px; margin: 10px 0; }
.claim p { margin: 10px 0; }
a.button { display: inline-block; padding: 10px 14px; border-radius: 8px; background: var(--accent); color: #fff; text-decoration: none; }
a.button.danger { background: var(--danger); }