/* fsgeek.ca — the notebook, not the front door.
   wamason.com is the restrained daylight site; this one is the one left
   open at 1am. Two type roles from one family (IBM Plex): mono for
   structure (paths, dates, the directory-listing device), serif for
   reading. Two accents, not decorative — copper marks the research wing,
   signal-teal marks the teaching wing, everywhere both appear. */

@font-face {
  font-family: "IBM Plex Mono";
  src: local("IBM Plex Mono");
}

:root {
  --ink: #14181f;
  --surface: #1c212b;
  --bone: #e7e2d3;
  --dim: #9aa0ac;
  --rule: #2e3542;
  --copper: #c97d4f;
  --signal: #5fa8a0;

  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Code", "SF Mono", Consolas, monospace;
  --serif: "IBM Plex Serif", "Source Serif 4", Charter, Georgia, serif;
}

* { box-sizing: border-box; }
html { color-scheme: dark; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--bone);
  font-family: var(--serif);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--copper); text-decoration-color: rgba(201, 125, 79, 0.4); }
a:hover { text-decoration-color: var(--copper); }
a.teaching-link { color: var(--signal); text-decoration-color: rgba(95, 168, 160, 0.4); }
a.teaching-link:hover { text-decoration-color: var(--signal); }

:focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--copper); color: var(--ink);
  padding: 8px 16px; z-index: 10; font-family: var(--mono); font-size: 14px;
}
.skip-link:focus { left: 0; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 24px; }
.wrap-wide { max-width: 920px; margin: 0 auto; padding: 0 24px; }

/* Header: identity + the three real sections. No hamburger performance —
   three links fit anywhere. */
header.site {
  border-bottom: 1px solid var(--rule);
  padding: 22px 0;
}
.site-row { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 10px; }
.wordmark {
  font-family: var(--mono); font-size: 16px; font-weight: 500;
  color: var(--bone); text-decoration: none; letter-spacing: -0.01em;
}
.wordmark:hover { color: var(--copper); }
.wordmark .prompt { color: var(--copper); }
nav.primary { font-family: var(--mono); font-size: 14px; }
nav.primary a { color: var(--dim); text-decoration: none; margin-left: 22px; }
nav.primary a:hover, nav.primary a[aria-current] { color: var(--bone); }

/* The hero: a literal directory listing. This IS the homepage's thesis
   and its primary navigation — not decoration standing in front of it. */
.hero { padding: 56px 0 40px; }
.hero-line {
  font-family: var(--mono); font-size: 14px; color: var(--dim);
  margin-bottom: 18px;
}
.hero-line .cwd { color: var(--bone); }
.dirlisting {
  font-family: var(--mono); font-size: 15px; line-height: 1.9;
  border: 1px solid var(--rule); border-radius: 4px;
  background: var(--surface); padding: 22px 26px;
}
.dirlisting .entry { display: flex; gap: 18px; flex-wrap: wrap; }
.dirlisting .entry + .entry { margin-top: 4px; }
.dirlisting .perm { color: #5b6472; white-space: nowrap; }
.dirlisting .name { min-width: 140px; }
.dirlisting .name a { text-decoration: none; font-weight: 600; }
.dirlisting .desc { color: var(--dim); font-family: var(--serif); font-style: italic; font-size: 14.5px; }
.dirlisting .cursor {
  display: inline-block; width: 8px; height: 15px; background: var(--copper);
  vertical-align: -2px; margin-left: 2px;
}
@media (prefers-reduced-motion: no-preference) {
  .dirlisting .cursor { animation: blink 1.1s steps(1) infinite; }
}
@keyframes blink { 50% { opacity: 0; } }

/* Log: recent posts as journal/commit lines. Real metadata, not markers
   invented for rhythm. */
.log { padding: 8px 0 48px; }
.log h2 {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--dim); font-weight: 500;
  margin: 0 0 18px;
}
.log-list { list-style: none; margin: 0; padding: 0; }
.log-line {
  display: flex; gap: 16px; align-items: baseline; flex-wrap: wrap;
  padding: 10px 0; border-bottom: 1px solid var(--rule);
  font-family: var(--mono); font-size: 14px;
}
.log-line:last-child { border-bottom: none; }
.log-date { color: var(--dim); white-space: nowrap; }
.log-tag {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.06em;
  padding: 2px 7px; border-radius: 3px; border: 1px solid var(--copper); color: var(--copper);
  white-space: nowrap;
}
.log-tag.teaching { border-color: var(--signal); color: var(--signal); }
.log-title { font-family: var(--serif); font-size: 15.5px; }
.log-title a { color: var(--bone); text-decoration: none; }
.log-title a:hover { color: var(--copper); }

/* Article / page reading template */
.breadcrumb {
  font-family: var(--mono); font-size: 13px; color: var(--dim);
  padding: 20px 0 0;
}
.breadcrumb a { color: var(--dim); text-decoration: none; }
.breadcrumb a:hover { color: var(--copper); }

article.entry { padding: 18px 0 64px; }
article.entry h1 {
  font-family: var(--serif); font-weight: 600; font-size: 32px;
  line-height: 1.25; margin: 14px 0 10px; max-width: 20ch;
}
.entry-meta {
  font-family: var(--mono); font-size: 13px; color: var(--dim);
  display: flex; gap: 14px; flex-wrap: wrap; align-items: center;
  margin-bottom: 36px; padding-bottom: 20px; border-bottom: 1px solid var(--rule);
}
.entry-body { font-size: 17px; }
.entry-body p { margin: 0 0 20px; }
.entry-body h2 { font-size: 22px; margin: 40px 0 14px; font-weight: 600; }
.entry-body h3 { font-size: 18px; margin: 32px 0 10px; font-weight: 600; }
.entry-body pre {
  background: var(--surface); border: 1px solid var(--rule); border-radius: 4px;
  padding: 16px 18px; overflow-x: auto; font-family: var(--mono); font-size: 13.5px;
}
.entry-body code { font-family: var(--mono); font-size: 0.9em; }
.entry-body img { max-width: 100%; border-radius: 4px; }
.entry-body blockquote {
  margin: 24px 0; padding-left: 20px; border-left: 3px solid var(--copper);
  color: var(--dim); font-style: italic;
}
.entry-body table {
  width: 100%; border-collapse: collapse; margin: 24px 0;
  font-family: var(--mono); font-size: 13.5px;
}
.entry-body table td, .entry-body table th {
  border: 1px solid var(--rule); padding: 8px 12px; text-align: left;
}
.entry-body table tr:first-child { color: var(--copper); font-weight: 600; }
.entry-body figure { margin: 28px 0; }
.entry-body figcaption {
  font-family: var(--mono); font-size: 12.5px; color: var(--dim); margin-top: 8px;
}

.pagelist {
  list-style: none; margin: 18px 0; padding: 0;
  font-family: var(--mono); font-size: 14.5px;
}
.pagelist li { padding: 7px 0; border-bottom: 1px solid var(--rule); }
.pagelist li:last-child { border-bottom: none; }
.pagelist a { color: var(--bone); text-decoration: none; }
.pagelist a:hover { color: var(--copper); }

footer.site {
  border-top: 1px solid var(--rule); padding: 28px 0 40px;
  font-family: var(--mono); font-size: 13px; color: var(--dim);
}
footer.site a { color: var(--dim); }
footer.site a:hover { color: var(--copper); }

@media (max-width: 640px) {
  .dirlisting .name { min-width: 0; }
  .dirlisting .entry { flex-direction: column; gap: 2px; }
  article.entry h1 { font-size: 26px; }
}