:root {
  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #5d6673;
  --line: #d9dde3;
  --accent: #1b365d;
  --accent-fg: #ffffff;
  --err: #a12a2a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101214;
    --fg: #ececec;
    --muted: #9aa3ae;
    --line: #2b3036;
    --accent: #cfe0f5;
    --accent-fg: #101214;
    --err: #ff9b9b;
  }
}
* {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  padding: max(24px, env(safe-area-inset-top)) max(20px, env(safe-area-inset-right))
    max(32px, env(safe-area-inset-bottom)) max(20px, env(safe-area-inset-left));
}
main {
  max-width: 28rem;
  margin: 0 auto;
}
h1 {
  font-size: 1.35rem;
  margin: 0 0 0.75rem;
}
h2 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.5rem;
}
p {
  margin: 0.5rem 0;
}
ol {
  padding-left: 1.25rem;
}
li {
  margin: 0.4rem 0;
}
.lead,
.note,
.who {
  color: var(--muted);
}
.error {
  color: var(--err);
}
.input {
  width: 100%;
  font-size: 16px; /* 16 px keeps iOS from zooming the page on focus */
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--fg);
}
.row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin: 0.75rem 0;
}
.btn {
  font: inherit;
  font-size: 16px;
  padding: 0.7rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-fg);
  min-height: 44px;
}
.btn.quiet {
  background: transparent;
  color: var(--accent);
}
.btn.big {
  display: block;
  width: 100%;
  min-height: 72px;
  font-size: 1.25rem;
  margin: 1rem 0;
}
.words {
  display: grid;
  gap: 0.25rem;
  margin: 1.25rem 0 0.5rem;
  text-align: center;
}
.word {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  word-break: break-word;
}
.fingerprint {
  font-size: 2.5rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-align: center;
}
.how {
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  padding-top: 0.75rem;
  color: var(--muted);
}
.how summary {
  cursor: pointer;
}

.preparing {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0.75rem 0 0.25rem;
}
.preparing .note {
  margin: 0;
}
.spinner {
  flex: none;
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation: none;
    border-top-color: var(--line);
  }
}
.stage {
  margin: 0.25rem 0 0.75rem;
  font-weight: 600;
}