/* nightmare-chess.nl */

:root {
  --bg: #f6f2ea;
  --surface: #fffdf8;
  --ink: #1d1a16;
  --muted: #6b6358;
  --line: #e2dacb;
  --accent: #8c2f1e;
  --accent-ink: #ffffff;
  --sq-light: #e9dcc3;
  --sq-dark: #a57c52;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15130f;
    --surface: #1e1b16;
    --ink: #ece6da;
    --muted: #a39a8c;
    --line: #322d25;
    --accent: #e0775f;
    --accent-ink: #15130f;
    --sq-light: #4a3f30;
    --sq-dark: #2a241c;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 var(--sans);
}

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

/* Checkerboard strip along the top */
.board-strip {
  height: 10px;
  background: repeating-linear-gradient(90deg,
    var(--sq-dark) 0 10px, var(--sq-light) 10px 20px);
}

/* Header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap {
  display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: 8px 24px;
  padding-top: 14px; padding-bottom: 14px;
}
.brand {
  font: 600 1.35rem/1 var(--serif);
  color: var(--ink); text-decoration: none;
  display: inline-flex; align-items: center; gap: 8px;
}
.brand-mark { color: var(--accent); font-size: 1.6rem; }
.site-nav { display: flex; gap: 20px; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
.site-nav a:hover { color: var(--ink); }

/* Headings */
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; }

/* Home */
.hero { padding: 56px 0 24px; max-width: 680px; }
.hero h1 { font-size: clamp(2rem, 5vw, 3rem); margin: 0 0 12px; }
.hero p { color: var(--muted); font-size: 1.1rem; margin: 0; }

.group { margin: 32px 0 48px; }
.group h2 {
  font-size: 1.4rem; margin: 0 0 16px;
  padding-bottom: 8px; border-bottom: 1px solid var(--line);
}
.group h2 small { font: .85rem var(--sans); color: var(--muted); margin-left: 6px; }

.cards {
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}
.card {
  display: grid; gap: 6px; align-content: start;
  position: relative;
  padding: 20px 20px 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink); text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card-piece { font-size: 2rem; line-height: 1; color: var(--accent); }
.card-title { font: 600 1.25rem/1.3 var(--serif); }
.card-summary { color: var(--muted); font-size: .95rem; }
.version {
  font: 500 .8rem var(--mono); color: var(--muted);
  border: 1px solid var(--line); border-radius: 4px;
  padding: 1px 6px; vertical-align: middle;
}
.status {
  justify-self: start; margin-top: 6px;
  font-size: .78rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--muted);
}

/* Engine page */
.crumbs { margin: 28px 0 0; font-size: .9rem; color: var(--muted); }
.crumbs a { color: var(--muted); }

.engine-head { padding: 12px 0 28px; border-bottom: 1px solid var(--line); }
.tag {
  display: inline-block; font-size: .78rem;
  text-transform: uppercase; letter-spacing: .08em; color: var(--accent);
}
.engine-head h1 { font-size: clamp(2rem, 5vw, 2.8rem); margin: 4px 0 8px; }
.lede { font-size: 1.15rem; color: var(--muted); margin: 0 0 20px; max-width: 640px; }

.facts { display: flex; flex-wrap: wrap; gap: 12px 32px; margin: 0; }
.facts dt { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.facts dd { margin: 0; font-weight: 500; }

.engine-body {
  display: grid; gap: 40px;
  grid-template-columns: minmax(0, 1fr) 300px;
  padding: 28px 0 56px;
}
@media (max-width: 800px) {
  .engine-body { grid-template-columns: 1fr; }
  .downloads { order: -1; }
}

/* Long-form text */
.prose { max-width: 680px; }
.prose.narrow { margin: 40px 0 64px; }
.prose h2 { font-size: 1.4rem; margin: 2em 0 .5em; }
.prose h2:first-child { margin-top: 0; }
.prose ul { padding-left: 1.2em; }
.prose li { margin: .3em 0; }
.prose code { font: .9em var(--mono); background: var(--surface); padding: 1px 5px; border-radius: 4px; border: 1px solid var(--line); }
.prose pre { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 14px; overflow-x: auto; }
.prose pre code { border: 0; padding: 0; }
.prose table { border-collapse: collapse; width: 100%; font-size: .95rem; display: block; overflow-x: auto; }
.prose th, .prose td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--line); }
.prose th { font-weight: 600; }
.prose img { max-width: 100%; height: auto; border-radius: 8px; }

/* Downloads */
.downloads {
  align-self: start;
  position: sticky; top: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px;
}
.downloads h2 { font-size: 1.15rem; margin: 0 0 12px; }
.dl {
  display: grid; gap: 2px;
  padding: 12px 14px; margin-bottom: 10px;
  border-radius: 8px;
  background: var(--accent); color: var(--accent-ink);
  text-decoration: none;
}
.dl:hover { filter: brightness(1.08); }
.dl-label { font-weight: 600; }
.dl-meta { font: .78rem var(--mono); opacity: .85; overflow-wrap: anywhere; }
.dl-missing { background: transparent; color: var(--muted); border: 1px dashed var(--line); }

.muted { color: var(--muted); }
.small { font-size: .85rem; margin: 6px 0 0; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; }
.site-footer .wrap { padding-top: 20px; padding-bottom: 28px; }
.site-footer p { margin: 4px 0; }