:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #666666;
  --border: #e5e5e5;
  --code: #f4f4f4;
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 Georgia, "Times New Roman", serif;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
}

header a { color: var(--text); text-decoration: none; }

main { max-width: 42rem; margin: 0 auto; padding: 32px 24px 64px; }

@media (max-width: 800px) {
  header { padding: 12px 16px; }
  main { padding: 20px 16px 48px; }
  form { flex-direction: column; align-items: stretch; }
  input, button { min-height: 44px; width: 100%; }
}

h1 { font-size: 1.6rem; font-weight: 500; margin: 0 0 16px; }

p { margin: 0 0 16px; }

ul { padding-left: 1.2rem; }

li { margin: 0 0 8px; }

a { color: var(--text); }

code, pre {
  font-family: Consolas, "Courier New", monospace;
  background: var(--code);
}

form { display: flex; gap: 12px; flex-wrap: wrap; align-items: end; }

label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; }

input, button {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--text);
  padding: 6px 8px;
}

.offscreen {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}