:root {
  --paper: #F7F6F2;
  --paper-dim: #EFEEE8;
  --ink: #1A1A18;
  --ink-soft: #4A4944;
  --ink-faint: #8A8880;
  --accent: #2D5F5A;
  --accent-soft: #C9DAD7;
  --line: #D8D6CE;
  --max-w: 700px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.mono {
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
}

/* -------- Skip link / focus -------- */
a { color: var(--accent); }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 16px;
  z-index: 100;
}
.skip-link:focus { left: 16px; top: 16px; }

/* -------- Header -------- */
header.site-header {
  border-bottom: 1px solid var(--line);
  padding: 20px 24px;
}
.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 24px;
}
.wordmark {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink);
}
.wordmark .dot { color: var(--accent); }
nav.site-nav {
  display: flex;
  gap: 20px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
}
nav.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
}
nav.site-nav a:hover, nav.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

/* -------- Layout -------- */
main { display: block; }
.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* -------- Log stamp (signature element) -------- */
.log-stamp {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--ink-faint);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 4px 10px;
  background: var(--paper-dim);
}
.log-stamp .k { color: var(--accent); }

/* -------- Hero -------- */
.hero {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--line);
}
.hero .eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 18px;
}
.hero h1 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
}
.hero p.lede {
  font-size: 20px;
  color: var(--ink-soft);
  max-width: 58ch;
  margin: 0 0 28px;
}
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* -------- Sections -------- */
section { padding: 56px 0; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: none; }
section h2 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 8px;
}
section .section-sub {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--ink-faint);
  margin: 0 0 28px;
}

/* -------- Timeline (origin proof) -------- */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--accent-soft);
}
.timeline li {
  position: relative;
  padding: 0 0 28px 28px;
}
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--accent);
}
.timeline .t-date {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--accent);
  display: block;
  margin-bottom: 4px;
}
.timeline .t-body { color: var(--ink-soft); margin: 0; }
.timeline .t-body strong { color: var(--ink); }

/* -------- Principles grid -------- */
.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
@media (max-width: 640px) {
  .principles { grid-template-columns: 1fr; }
}
.principle {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 22px;
  background: var(--paper-dim);
}
.principle .p-mark {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--accent);
  margin: 0 0 10px;
}
.principle h3 {
  font-size: 17px;
  margin: 0 0 8px;
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 600;
}
.principle p {
  font-size: 15px;
  color: var(--ink-soft);
  margin: 0;
}

/* -------- Post list -------- */
.post-list { list-style: none; margin: 0; padding: 0; }
.post-item {
  display: block;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
}
.post-item:last-child { border-bottom: none; }
.post-item .p-date {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--ink-faint);
  display: block;
  margin-bottom: 6px;
}
.post-item .p-title {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px;
}
.post-item .p-excerpt {
  color: var(--ink-soft);
  font-size: 16px;
  margin: 0;
}
.post-item:hover .p-title { color: var(--accent); }
.post-item .p-status {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* -------- Article body -------- */
article.post-body {
  padding: 48px 0 72px;
}
article.post-body h1 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: clamp(26px, 4.5vw, 36px);
  line-height: 1.3;
  margin: 0 0 16px;
}
article.post-body .byline {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--ink-faint);
  margin: 0 0 32px;
}
article.post-body h2 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 21px;
  font-weight: 600;
  margin: 40px 0 16px;
}
article.post-body p { margin: 0 0 20px; }
article.post-body ul, article.post-body ol { margin: 0 0 20px; padding-left: 24px; }
article.post-body li { margin-bottom: 8px; }
article.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 28px;
  font-size: 15px;
}
article.post-body th, article.post-body td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
}
article.post-body th {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}
article.post-body pre {
  background: var(--paper-dim);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 18px;
  overflow-x: auto;
  font-size: 14px;
  margin: 0 0 24px;
}
article.post-body code {
  font-family: 'IBM Plex Mono', monospace;
}
article.post-body blockquote {
  margin: 0 0 24px;
  padding-left: 20px;
  border-left: 3px solid var(--accent-soft);
  color: var(--ink-soft);
  font-style: italic;
}
.series-nav {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 14px;
}
.series-nav a { text-decoration: none; }

/* -------- About page -------- */
.about-block { max-width: 62ch; }
.about-block p { color: var(--ink-soft); }
.credential-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 10px;
  font-size: 15px;
}
.credential-list li {
  padding-left: 18px;
  position: relative;
  color: var(--ink-soft);
}
.credential-list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* -------- Footer -------- */
footer.site-footer {
  padding: 32px 24px 48px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--ink-faint);
}
footer .footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* -------- Reduced motion -------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}