/* tacit.software institutional page — system fonts only, no external resources. */
:root {
  --bg: #fbfaf7;
  --fg: #1d1d1b;
  --muted: #5c5a55;
  --rule: #dcd8cf;
  --accent: #1f4e46;
  --panel: #f2efe8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161714;
    --fg: #ecebe6;
    --muted: #a8a59c;
    --rule: #34352f;
    --accent: #8cc7b9;
    --panel: #1f201c;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.wrap { max-width: 46rem; margin: 0 auto; padding: 0 16px; }
.top { border-bottom: 1px solid var(--rule); }
.top .wrap { display: flex; justify-content: space-between; align-items: baseline; padding-top: 14px; padding-bottom: 14px; }
.mark { font-weight: 700; letter-spacing: .02em; font-size: 1.15rem; }
.host { color: var(--muted); font-size: .9rem; }
h1 { font-size: 1.9rem; line-height: 1.2; margin: 2.2rem 0 1rem; }
h2 { font-size: 1.25rem; margin: 2.4rem 0 .6rem; padding-top: 1.2rem; border-top: 1px solid var(--rule); }
p, ul, dl { margin: 0 0 1rem; }
ul { padding-left: 1.2rem; }
li { margin-bottom: .35rem; }
a { color: var(--accent); text-underline-offset: 2px; }
code { font: .92em/1.4 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; overflow-wrap: anywhere; }
.nl { background: var(--panel); border-left: 3px solid var(--accent); padding: .8rem 1rem; }
.note { color: var(--muted); font-size: .95rem; }
dt { font-weight: 650; }
dd { margin: .2rem 0 0; }
.cols { display: grid; gap: 1rem; }
.cols > div, .rows > div { background: var(--panel); padding: .9rem 1rem; }
.rows { display: grid; gap: .8rem; }
.plain { list-style: none; padding: 0; margin: .5rem 0 0; }
@media (min-width: 720px) {
  .cols { grid-template-columns: repeat(3, 1fr); }
}
.foot { margin-top: 3rem; padding-top: 1rem; padding-bottom: 2rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: .9rem; }

/* contact form (S356) */
.contact { display: grid; gap: .2rem; background: var(--panel); padding: 1.1rem 1rem; }
.contact p { margin: 0 0 .8rem; }
.contact label { display: block; font-weight: 600; font-size: .95rem; margin-bottom: .3rem; }
.contact input, .contact select, .contact textarea {
  box-sizing: border-box; width: 100%; min-height: 48px; padding: .6rem .75rem; font: inherit;
  color: var(--fg); background: var(--bg); border: 1px solid var(--rule); border-radius: 4px; }
.contact textarea { min-height: 9rem; resize: vertical; }
.contact input:focus, .contact select:focus, .contact textarea:focus, .contact button:focus {
  outline: 2px solid var(--accent); outline-offset: 2px; }
.contact button { min-height: 48px; padding: 0 1.4rem; font: inherit; font-weight: 600; color: var(--bg);
  background: var(--accent); border: 0; border-radius: 4px; cursor: pointer; }
.contact .pair { display: grid; gap: 0 1rem; }
.contact .trap { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
@media (min-width: 720px) { .contact .pair { grid-template-columns: 1fr 1fr; } }
.foot .notes { margin: 0 0 1rem; padding-left: 1.2rem; font-size: .85rem; line-height: 1.5; }
.foot .notes li { margin-bottom: .3rem; }