/* 0x00.is — digital home
   Design system: mechanical monospace throughout (IBM Plex Mono, vendored).
   Library/archive presentation — catalogue codes, record strips, rule-line
   hierarchy. Thesis register: minimal, functional, Bauhaus geometry — flat
   planes, no radii, no ornament, one signal colour against paper and ink. */

@font-face {
  font-family: 'Plex Mono';
  src: url('fonts/plexmono-400.woff2') format('woff2');
  font-weight: 400; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Plex Mono';
  src: url('fonts/plexmono-400-italic.woff2') format('woff2');
  font-weight: 400; font-style: italic; font-display: swap;
}
@font-face {
  font-family: 'Plex Mono';
  src: url('fonts/plexmono-500.woff2') format('woff2');
  font-weight: 500; font-style: normal; font-display: swap;
}
@font-face {
  font-family: 'Plex Mono';
  src: url('fonts/plexmono-600.woff2') format('woff2');
  font-weight: 600; font-style: normal; font-display: swap;
}

:root {
  --bg: #f4f2ec;          /* archival paper */
  --ink: #141412;
  --ink-soft: #5c5952;
  --line: #d9d5c9;        /* hairline */
  --rule: #141412;        /* structural rule = ink */
  --accent: #c8361b;      /* single Bauhaus signal */
  --panel: #ece9e0;
  --max: 44rem;
  --mono: 'Plex Mono', ui-monospace, 'SF Mono', 'Cascadia Code', Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161614;
    --ink: #e6e3da;
    --ink-soft: #a19d92;
    --line: #34332e;
    --rule: #e6e3da;
    --accent: #ff6a4d;
    --panel: #1e1e1b;
  }
}

* { box-sizing: border-box; }

html { font-size: 16px; }

/* ---------- keyboard access ---------- */

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

.skip {
  position: absolute;
  left: 0; top: 0;
  transform: translateY(-200%);
  background: var(--ink);
  color: var(--bg);
  padding: 0.55rem 1.1rem;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  z-index: 10;
}

.skip:focus { transform: none; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-weight: 400;
  line-height: 1.7;
}

/* ---------- chrome ---------- */

.site-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: baseline;
  justify-content: space-between;
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.3rem 1.25rem 1rem;
  border-bottom: 2px solid var(--rule);
}

.mark {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
}

.mark .tld { color: var(--ink-soft); font-weight: 400; }

.site-head nav { display: flex; gap: 1.4rem; flex-wrap: wrap; }

.site-head nav a {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
}

.site-head nav a.here { color: var(--accent); }
.site-head nav a:hover { color: var(--ink); }

/* larger, better-spaced touch targets on small screens; the full
   small-screen navigation treatment awaits the real-device pass */
@media (max-width: 34rem) {
  .site-head nav { gap: 0.5rem 1.1rem; }
  .site-head nav a {
    font-size: 0.78rem;
    padding: 0.3rem 0;
    display: inline-block;
  }
}

.site-foot {
  max-width: var(--max);
  margin: 3.5rem auto 0;
  padding: 1rem 1.25rem 2.4rem;
  border-top: 2px solid var(--rule);
  color: var(--ink-soft);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.6rem 1.25rem 0;
}

/* ---------- shared text ---------- */

h1, h2, h3, h4 {
  font-family: var(--mono);
  font-weight: 600;
  line-height: 1.3;
  margin: 2.4rem 0 0.8rem;
}

h1 {
  font-size: 1.45rem;
  margin-top: 1.6rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--rule);
}

h2 {
  font-size: 1.05rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--line);
}

h3 { font-size: 0.95rem; }

/* long-form reading: full-size body copy in the mono face (launch decision
   2026-08-16 — option 2 of the typography review: keep the mono identity,
   raise the reading size). Paragraph separation slightly widened; the 44rem
   measure now yields ~73 mono characters per line. */
p, li { font-size: 1rem; }
p { margin: 1.15em 0; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 0.2em; }
p a, li a, td a { text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 0.2em; }
p a:hover, li a:hover, td a:hover { text-decoration-color: var(--accent); }

strong { font-weight: 600; }

blockquote {
  margin: 1.2rem 0;
  padding: 0.1rem 0 0.1rem 1.1rem;
  border-left: 2px solid var(--accent);
  color: var(--ink-soft);
}

code, pre { font-family: var(--mono); font-size: 0.88em; }

code { background: var(--panel); padding: 0.05em 0.3em; }

pre {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 0.8rem 1rem;
  overflow-x: auto;
}

pre code { background: none; padding: 0; }

table {
  border-collapse: collapse;
  margin: 1.4rem 0;
  font-size: 0.82rem;
  display: block;
  overflow-x: auto;
  border-top: 2px solid var(--rule);
}

th, td {
  border-bottom: 1px solid var(--line);
  padding: 0.45rem 0.8rem 0.45rem 0;
  text-align: left;
  vertical-align: top;
}

th {
  font-weight: 600;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

hr { border: 0; border-top: 1px solid var(--line); margin: 2.4rem 0; }

/* ---------- landing (thesis cover) ---------- */

.hero {
  padding: 3.4rem 0 1.6rem;
  border-bottom: 2px solid var(--rule);
  margin-bottom: 1.8rem;
}

.hero .cipher {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 3rem;
  letter-spacing: 0.03em;
  margin: 0 0 0.5rem;
  line-height: 1;
  border-bottom: 0;
  padding-bottom: 0;
}

.hero .cipher .tld { color: var(--ink-soft); font-weight: 400; }

.hero .strap {
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-style: normal;
  margin: 0;
}

.axiom {
  font-size: 1.25rem;
  font-weight: 500;
  font-style: italic;
  text-align: center;
  margin: 2.8rem 0;
  padding: 1.2rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.layers {
  display: grid;
  gap: 0;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  margin: 2.4rem 0;
  border: 2px solid var(--rule);
}

.layer {
  border: 1px solid var(--line);
  margin: -0.5px;
  padding: 1.1rem 1.2rem 1.3rem;
  background: var(--bg);
  text-decoration: none;
  color: var(--ink);
}

.layer:hover { background: var(--panel); text-decoration: none; }

.layer b {
  display: block;
  font-weight: 600;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.layer span { font-size: 0.82rem; line-height: 1.6; display: block; }

/* ---------- doc pages (catalogue records) ---------- */

.doc-head h1 {
  border-bottom: 0;
  padding-bottom: 0;
  margin-bottom: 0.4rem;
}

.doc-subtitle {
  font-size: 0.88rem;
  font-style: italic;
  color: var(--ink-soft);
  margin: 0 0 0.8rem;
}

.doc-head .doc-meta { margin-top: 0.9rem; }

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1.6rem;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border-top: 2px solid var(--rule);
  border-bottom: 1px solid var(--line);
  padding: 0.5rem 0;
  margin: 1.6rem 0 0.4rem;
}

.doc-meta b { color: var(--ink); font-weight: 600; margin-right: 0.35rem; }

.draft-banner {
  font-size: 0.8rem;
  border-left: 3px solid var(--accent);
  background: var(--panel);
  color: var(--ink);
  padding: 0.6rem 0.9rem;
  margin: 1.5rem 0 0;
}

.doc-footer-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin: 3rem 0 0;
  padding-top: 1rem;
  border-top: 2px solid var(--rule);
  font-size: 0.8rem;
}

.doc-footer-nav .next { margin-left: auto; text-align: right; }

/* ---------- frontier log (file cards) ---------- */

.thread-head {
  border-top: none;
  border-bottom: 2px solid var(--rule);
  padding-bottom: 0.4rem;
  margin-top: 3.2rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.9rem;
}

.entry {
  border: 1px solid var(--line);
  border-top: 2px solid var(--rule);
  padding: 1rem 1.2rem 0.5rem;
  margin: 1.4rem 0;
}

.entry h3 { margin-top: 0.2rem; }

.entry .tags {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1.3rem;
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}

.entry .tags b { color: var(--accent); font-weight: 600; }

.entry .reading { font-size: 0.88rem; }

.entry .caveat { font-size: 0.78rem; color: var(--ink-soft); font-style: italic; }

.entry .source { font-size: 0.8rem; margin: 0.5rem 0 0; }
.entry .source b { color: var(--accent); font-weight: 600; }

.series { border: 2px solid var(--rule); }

.seed-note {
  font-size: 0.75rem;
  color: var(--ink-soft);
}

/* ---------- walk page (numbered sequence) ---------- */

.walk-step {
  display: grid;
  grid-template-columns: 2.6rem 1fr;
  gap: 1rem;
  margin: 0;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--line);
}

.walk-step .n {
  font-weight: 600;
  color: var(--accent);
  font-size: 1.15rem;
  padding-top: 0.1rem;
}

.walk-step h3 { margin: 0 0 0.35rem; }

.walk-step p { margin: 0.35rem 0; font-size: 0.88rem; }

.walk-step .goto {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 0.6rem;
}
.walk-step .goto a { text-decoration: none; }
.walk-step .goto a:hover { text-decoration: underline; }

/* ---------- library index descriptions ---------- */

.lib-desc { color: var(--ink-soft); font-size: 0.82rem; }

.lib-draft {
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.05rem 0.35rem;
  margin-left: 0.55rem;
  white-space: nowrap;
}

/* ---------- walk page: three-movements flow ---------- */

.movements {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 0.6rem;
  align-items: stretch;
  margin: 1.2rem 0 0.4rem;
}

.movements .mv {
  border: 1px solid var(--line);
  border-top: 2px solid var(--rule);
  padding: 0.6rem 0.8rem 0.7rem;
}

.movements .mv b {
  display: block;
  color: var(--accent);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 0.3rem;
}

.movements .mv span { font-size: 0.78rem; line-height: 1.5; display: block; }

.movements .mv-arrow {
  align-self: center;
  color: var(--ink-soft);
  font-size: 1rem;
}

@media (max-width: 34rem) {
  .movements { grid-template-columns: 1fr; }
  .movements .mv-arrow { justify-self: center; transform: rotate(90deg); }
}

/* ---------- frontier log: goalpost timeline ---------- */

.goalposts {
  border-top: 2px solid var(--rule);
  margin: 1.6rem 0 0.4rem;
}

.goalposts .gp {
  display: grid;
  grid-template-columns: 5rem 1fr 1fr;
  gap: 0.4rem 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.82rem;
}

.goalposts .gp-when { color: var(--accent); font-weight: 600; font-size: 0.75rem; }
.goalposts .gp-then { color: var(--ink-soft); }

@media (max-width: 34rem) {
  .goalposts .gp { grid-template-columns: 5rem 1fr; }
  .goalposts .gp-then { grid-column: 2; }
}

/* ---------- landscape figure (two-axis plot) ---------- */

.axes-fig { margin: 2rem 0; }

.axes-fig .plot {
  border: 1px solid var(--line);
  border-top: 2px solid var(--rule);
  padding: 0.8rem;
  overflow-x: auto;
  background: var(--bg);
}

.axes-fig svg { display: block; width: 100%; min-width: 560px; height: auto; }

.axes-fig .ax { stroke: var(--rule); stroke-width: 2; }

.axes-fig .pt { fill: var(--ink); }
.axes-fig .pt-origin { fill: var(--accent); }

.axes-fig text { font-family: var(--mono); font-size: 11px; fill: var(--ink); }
.axes-fig .origin-lbl { font-weight: 600; }

.axes-fig .pole {
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  fill: var(--ink-soft);
}

.axes-fig .axname {
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  fill: var(--ink-soft);
}

.axes-fig figcaption { font-size: 0.75rem; color: var(--ink-soft); margin-top: 0.6rem; }

/* ---------- apparatus (TOC, citation, bibliography) ---------- */

.toc {
  border: 1px solid var(--line);
  border-top: 2px solid var(--rule);
  padding: 0.55rem 1rem;
  margin: 1.3rem 0;
  font-size: 0.82rem;
  background: var(--bg);
}

.toc summary {
  cursor: pointer;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.toc ul { margin: 0.5rem 0 0.4rem 0.4rem; padding-left: 0.8rem; list-style: none; border-left: 1px solid var(--line); }
.toc li { font-size: 0.8rem; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }

.cite-block {
  margin: 2.6rem 0 0;
  border-top: 2px solid var(--rule);
  border-bottom: 1px solid var(--line);
  padding: 0.7rem 0;
  font-size: 0.75rem;
  color: var(--ink-soft);
}

.cite-block b {
  color: var(--ink);
  display: block;
  margin-bottom: 0.3rem;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.cite-line { font-size: 0.75rem; }

ol.bib { padding-left: 0; list-style: none; border-top: 2px solid var(--rule); }
ol.bib li {
  margin: 0;
  padding: 0.5rem 0 0.5rem 5.4rem;
  text-indent: -5.4rem;
  font-size: 0.82rem;
  border-bottom: 1px solid var(--line);
}
.src-id { font-weight: 600; font-size: 0.72rem; color: var(--accent); margin-right: 0.6rem; }
.src-frame { color: var(--ink-soft); font-size: 0.75rem; }