/* SINGULARITY site — white on black, after the AI terminal.
   Colors follow DLSP: ^^X128 white, ^^X-128 black, ^^WR warm red accent. */
:root {
  --bg: #000000;
  --fg: #ffffff;
  --dim: #8a8a8a;
  --rule: #2a2a2a;
  --accent: #E8350A;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Iosevka", "Iosevka Term", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-weight: 300;
  font-variant-ligatures: none;
  font-size: 18px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

main, header.site, footer.site {
  max-width: 78rem;
  margin: 0 auto;
  padding: 0 2rem;
}

header.site { padding-top: 2rem; padding-bottom: 1rem; }
header.site nav { display: flex; gap: 1.5rem; flex-wrap: wrap; }
header.site a.home { margin-right: auto; }

main { padding-top: 3rem; padding-bottom: 5rem; }

footer.site { padding-top: 1.5rem; padding-bottom: 3rem; color: var(--dim); border-top: 1px solid var(--rule); font-size: 0.85rem; }

h1, h2, h3 { font-weight: 300; line-height: 1.3; }
h1 { font-size: 2rem; margin: 0 0 1.5rem; }
h2 { font-size: 1.25rem; margin: 3.5rem 0 1rem; }
h3 { font-size: 1rem; margin: 2rem 0 0.5rem; color: var(--dim); }

p { margin: 0 0 1.25rem; max-width: 62rem; }
ul, ol { max-width: 62rem; }
em { font-style: italic; }
strong { font-weight: 500; }

a { color: var(--fg); text-decoration: underline; text-decoration-color: var(--rule); text-underline-offset: 0.25em; }
a:hover, a:focus-visible { color: var(--accent); text-decoration-color: var(--accent); }

.dim { color: var(--dim); }
.lede { color: var(--dim); }

hr { border: 0; border-top: 1px solid var(--rule); margin: 3rem 0; }

ul.index { list-style: none; padding: 0; margin: 0; }
ul.index li { padding: 1rem 0; border-top: 1px solid var(--rule); }
ul.index li:last-child { border-bottom: 1px solid var(--rule); }
ul.index a { text-decoration: none; }
ul.index .desc { display: block; color: var(--dim); font-size: 0.9rem; }

table { border-collapse: collapse; width: 100%; margin: 0 0 1.5rem; font-size: 0.9rem; }
th, td { text-align: left; padding: 0.5rem 0.75rem 0.5rem 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-weight: 500; color: var(--dim); }

code { font-family: inherit; color: var(--accent); }

blockquote { margin: 0 0 1.25rem; padding-left: 1.25rem; border-left: 1px solid var(--accent); color: var(--dim); }

::selection { background: var(--accent); color: var(--bg); }

/* two-up layouts on wide screens */
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 0 4rem; }
ul.index.grid { display: grid; grid-template-columns: 1fr 1fr; column-gap: 4rem; }
ul.index.grid li:nth-last-child(2):nth-child(odd) { border-bottom: 1px solid var(--rule); }

@media (min-width: 1500px) { body { font-size: 20px; } }

@media (max-width: 900px) {
  .cols, ul.index.grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  main, header.site, footer.site { padding: 0 1.25rem; }
  header.site nav { font-size: 0.8rem; gap: 1rem; }
  body { font-size: 16px; }
  h1 { font-size: 1.6rem; }
}