:root {
  color-scheme: light dark;
  --bg: #f4f1ea; --ink: #1d1e21; --muted: #5f5c55; --line: #d8d2c4; --link: #a8321f;
  --code-bg: #ebe6db; --code-ink: #24252a; --accent: #a8321f; --accent-ink: #fff;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a; --ink: #e7e3da; --muted: #a29e95; --line: #33353b; --link: #f08a72;
    --code-bg: #1f2125; --code-ink: #e7e3da; --accent: #f08a72; --accent-ink: #16171a;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 var(--sans); }
main { max-width: 820px; margin: 0 auto; padding: 48px 22px 64px; }
h1 { font-size: clamp(28px, 4vw, 38px); line-height: 1.15; margin: 0 0 14px; letter-spacing: -.01em; }
h2 { font-size: 19px; margin: 0 0 10px; }
p, ol { margin: 0 0 14px; }
ol { padding-left: 22px; }
a { color: var(--link); }
.lede { color: var(--muted); font-size: 17px; }
code { font: 14px var(--mono); }
:not(pre) > code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }

.machine { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin: 22px 0 6px; }
.machine label { font-weight: 600; }
.machine input {
  font: 15px var(--mono); color: var(--ink); background: var(--code-bg);
  border: 1px solid var(--line); border-radius: 6px; padding: 7px 10px; width: 14em; max-width: 100%;
}
.machine input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.machine .hint { color: var(--muted); font-size: 14px; }
.generation { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 8px 12px; align-items: center; margin: 4px 0 16px; }
.generation label { font-weight: 600; }
.generation input {
  font: 14px var(--mono); color: var(--ink); background: var(--code-bg);
  border: 1px solid var(--line); border-radius: 6px; padding: 7px 10px; width: 100%;
}
.generation input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.fields input[aria-invalid="true"] { border: 1px dashed var(--accent); }
@media (max-width: 520px) { .generation { grid-template-columns: 1fr; gap: 4px; } .generation input { margin-bottom: 6px; } }

nav { display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 18px 0 8px; }
nav a { font: 500 14px var(--mono); text-decoration: none; }
nav a:hover { text-decoration: underline; }

section { border-top: 1px solid var(--line); padding: 24px 0 8px; margin-top: 22px; scroll-margin-top: 12px; }

pre {
  position: relative; margin: 0 0 16px; padding: 14px 16px; background: var(--code-bg); color: var(--code-ink);
  border: 1px solid var(--line); border-radius: 8px;
  white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.5;
}
pre.has-copy { padding-top: 44px; }
.m { color: var(--accent); font-weight: 700; }
.copy {
  position: absolute; top: 8px; right: 8px; font: 600 12px var(--sans); color: var(--ink);
  background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 5px 10px; cursor: pointer;
}
.copy:hover, .copy:focus-visible { border-color: var(--accent); }
.copy:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.copy.done { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }