:root {
  --bg: #f7f5f0;
  --panel: #ffffff;
  --ink: #1c1b18;
  --muted: #6b675d;
  --line: #e2ded4;
  --accent: #1f6f5c;
  --accent-ink: #ffffff;
  --warn-bg: #fff6e0;
  --warn-line: #e9c56a;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15140f;
    --panel: #1f1e18;
    --ink: #ecebe6;
    --muted: #a39f94;
    --line: #35332b;
    --accent: #59b89d;
    --accent-ink: #0f1a16;
    --warn-bg: #2b2412;
    --warn-line: #8a6d1f;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 640px; margin: 0 auto; padding: 32px 16px 64px; }
header { margin-bottom: 28px; }
h1 { font-size: 2rem; line-height: 1.15; margin: 0 0 8px; letter-spacing: -0.01em; }
.tagline { font-size: 1.15rem; color: var(--muted); margin: 0; }
h2 { font-size: 1.2rem; margin: 32px 0 8px; }
p { margin: 0 0 12px; }
a { color: var(--accent); }
nav { font-size: .95rem; margin-bottom: 20px; }
nav a + a { margin-left: 16px; }

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 20px;
  margin: 16px 0;
}
.qr-wrap { display: flex; justify-content: center; padding: 8px 0 16px; }
.qr-wrap svg { width: min(100%, 280px); height: auto; background: #fff; padding: 12px; border-radius: 8px; }
.secret {
  font-family: var(--mono);
  font-size: 1.05rem;
  letter-spacing: .08em;
  word-break: break-all;
  padding: 12px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  text-align: center;
  user-select: all;
}
.code-row {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 16px;
  margin-top: 8px;
}
.code {
  font-family: var(--mono);
  font-size: 2.6rem;
  letter-spacing: .12em;
  font-variant-numeric: tabular-nums;
}
.countdown { color: var(--muted); font-variant-numeric: tabular-nums; }
.row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
button {
  font: inherit;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  cursor: pointer;
}
button.primary, .button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.button {
  display: block;
  text-align: center;
  text-decoration: none;
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--line);
  margin-top: 12px;
}
.mobile-only { display: none; }
@media (pointer: coarse), (max-width: 600px) {
  .mobile-only { display: block; }
}
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
label { display: block; font-size: .9rem; color: var(--muted); margin-bottom: 4px; }
input[type=text] {
  font: inherit;
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
}
.warn {
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: .95rem;
}
ol, ul { padding-left: 22px; }
li { margin-bottom: 6px; }
.small { font-size: .88rem; color: var(--muted); }
.steps li strong { display: block; }
footer { margin-top: 48px; font-size: .85rem; color: var(--muted); border-top: 1px solid var(--line); padding-top: 16px; }
.hidden { display: none; }