/* Universal Field Validator — documentation site.
   Light-first tokens; the dark set only redefines the tokens. */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --bg-code: #f2f4f7;
  --fg: #14171c;
  --fg-muted: #565f6b;
  --border: #dfe3e9;
  --accent: #0a5c9e;
  --accent-soft: #e8f1fa;
  --ok: #15703c;
  --warn: #8a5200;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --measure: 74ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --bg-soft: #161b21;
    --bg-code: #1a2028;
    --fg: #e6e9ee;
    --fg-muted: #9aa4b1;
    --border: #29313a;
    --accent: #6cb6f5;
    --accent-soft: #16222e;
    --ok: #57c98a;
    --warn: #e0ac5b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 var(--sans);
  -webkit-text-size-adjust: 100%;
}

.wrap { width: 100%; max-width: 960px; margin: 0 auto; padding: 0 1.25rem; }

.skip {
  position: absolute; left: -9999px;
  background: var(--accent); color: #fff; padding: .6rem 1rem; z-index: 10;
}
.skip:focus { left: 1rem; top: 1rem; }

/* --- header / nav --- */

header.site {
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
  position: sticky; top: 0; z-index: 5;
}
header.site .wrap {
  display: flex; flex-wrap: wrap; gap: .5rem 1.25rem;
  align-items: center; padding-block: .75rem;
}
.brand { font-weight: 650; color: var(--fg); text-decoration: none; letter-spacing: -.01em; }
header nav { display: flex; flex-wrap: wrap; gap: .25rem .9rem; font-size: .875rem; }
header nav a { color: var(--fg-muted); text-decoration: none; font-family: var(--mono); }
header nav a:hover { color: var(--accent); }
header nav a.here { color: var(--accent); font-weight: 600; }

/* --- content --- */

main { padding-block: 2.5rem 4rem; }
main > * { max-width: var(--measure); }

h1 {
  font-size: clamp(1.8rem, 1.3rem + 2vw, 2.6rem);
  line-height: 1.15; letter-spacing: -.02em; margin: 0 0 .5rem;
  font-family: var(--mono); font-weight: 650;
}
h2 {
  font-size: 1.3rem; line-height: 1.3; letter-spacing: -.01em;
  margin: 2.75rem 0 .75rem; padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}
h3 { font-size: 1.05rem; margin: 1.75rem 0 .5rem; }

.lede {
  font-size: 1.1rem; color: var(--fg-muted);
  margin: 0 0 2rem; padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

p, ul, ol { margin: 0 0 1rem; }
li { margin-bottom: .4rem; }
a { color: var(--accent); text-underline-offset: 2px; }

code {
  font-family: var(--mono); font-size: .875em;
  background: var(--bg-code); padding: .12em .38em; border-radius: 4px;
  overflow-wrap: break-word;
}

pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: .9rem 1rem;
  overflow-x: auto;
  font-size: .875rem; line-height: 1.55;
  max-width: var(--measure);
}
pre code { background: none; padding: 0; font-size: inherit; }

blockquote {
  margin: 1.25rem 0; padding: .1rem 0 .1rem 1rem;
  border-left: 3px solid var(--border); color: var(--fg-muted);
}

/* wide content scrolls in its own box, never the page */
.scroll { overflow-x: auto; max-width: var(--measure); margin-bottom: 1.25rem; }
table { border-collapse: collapse; font-size: .9rem; min-width: 32rem; }
th, td { text-align: left; padding: .5rem .8rem; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-weight: 600; }

.note {
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-radius: 8px; padding: .9rem 1.1rem; margin: 1.5rem 0;
  max-width: var(--measure);
}
.note p:last-child { margin-bottom: 0; }
.note strong { color: var(--fg); }

/* --- related cards --- */

.related h2 { margin-top: 3rem; }
.cards { display: grid; gap: .75rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); max-width: var(--measure); }
.card {
  display: block; text-decoration: none; color: inherit;
  border: 1px solid var(--border); border-radius: 8px; padding: .8rem 1rem;
  background: var(--bg-soft);
}
.card:hover { border-color: var(--accent); }
.card strong { display: block; font-family: var(--mono); color: var(--accent); font-size: .95rem; }
.card span { display: block; margin-top: .3rem; font-size: .85rem; color: var(--fg-muted); line-height: 1.45; }

/* --- footer --- */

footer.site {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding-block: 2rem 3rem;
  font-size: .875rem; color: var(--fg-muted);
}
footer.site p { max-width: var(--measure); }
footer.site .fine { font-size: .8rem; opacity: .85; margin-bottom: 0; }