:root {
  --bg: #ffffff;
  --text: #1c1c1e;
  --muted: #6c6c70;
  --panel: #f2f2f7;
  --accent: #c76b4a;
  --accent-text: #ffffff;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --text: #f2f2f7;
    --muted: #a1a1a6;
    --panel: #1c1c1e;
    --accent: #e08a68;
    --accent-text: #000000;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 19px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 34rem;
  margin: 0 auto;
  padding: 40px 16px 64px;
}

h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 12px; }
h2 { font-size: 1.25rem; margin: 32px 0 8px; }
.lead { font-size: 1.15rem; color: var(--muted); }
.label { margin: 24px 0 4px; color: var(--muted); }
.note { color: var(--muted); }
ol { padding-left: 1.25rem; }
li { margin-bottom: 10px; }
a { color: var(--accent); }

.code {
  margin: 0;
  padding: 16px;
  border-radius: 12px;
  background: var(--panel);
  font: 600 2.5rem/1.2 ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0.08em;
  text-align: center;
  user-select: all;
}

.button {
  display: block;
  padding: 16px;
  border-radius: 14px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  font-size: 1.15rem;
  text-align: center;
  text-decoration: none;
}