:root {
  --background: #f4efe3;
  --surface: #fffdf8;
  --primary: #123d2f;
  --accent: #e0b65a;
  --text: #1c1f1d;
  --muted: #55605a;
  --border: #e2dac8;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family:
    system-ui,
    -apple-system,
    'Segoe UI',
    Arial,
    sans-serif;
  line-height: 1.6;
}
header {
  background: var(--primary);
  color: var(--background);
  padding: 16px;
}
header a {
  color: var(--background);
  text-decoration: none;
  font-weight: 700;
}
header nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  max-width: 760px;
  margin: 0 auto;
}
header nav .lang {
  margin-inline-start: auto;
  font-weight: 400;
}
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}
h1 {
  line-height: 1.25;
}
h2 {
  margin-top: 32px;
}
a {
  color: var(--primary);
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 20px;
  margin: 16px 0;
}
.muted {
  color: var(--muted);
}
.code {
  direction: ltr;
  font-family: ui-monospace, Menlo, Consolas, monospace;
  font-size: 2rem;
  letter-spacing: 0.2em;
  text-align: center;
  margin: 8px 0 16px;
}
.button {
  display: block;
  text-align: center;
  background: var(--primary);
  color: var(--background);
  padding: 14px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 700;
}
footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
  padding: 24px 16px;
}