:root {
  --paper: #FAFAF7;
  --paper-raised: #F3F1EA;
  --ink: #1A2333;
  --ink-soft: #3A4356;
  --accent: #7A2E2E;
  --accent-soft: #A85454;
  --slate: #5B6B6B;
  --rule: #D8D3C7;
  --rule-soft: #E7E3D8;
  --max-width: 680px;
  --max-width-wide: 900px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Source Sans 3', 'Segoe UI', system-ui, sans-serif;
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

h1, h2, h3 {
  font-family: 'Source Serif 4', Georgia, serif;
  color: var(--ink);
  line-height: 1.15;
  font-weight: 600;
  margin: 0 0 0.5em;
}

a {
  color: var(--accent);
  text-decoration-color: var(--accent-soft);
  text-underline-offset: 3px;
}

a:hover { color: var(--ink); }

a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.label {
  font-family: 'JetBrains Mono', 'Courier New', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
}

/* ---- Calibration rule: signature element ---- */
.calibration {
  display: flex;
  align-items: center;
  gap: 3px;
  width: 100%;
  height: 10px;
  margin: 0.9em 0 1.6em;
  overflow: hidden;
}
.calibration span {
  flex: 1;
  height: 1px;
  background: var(--rule);
  position: relative;
}
.calibration span::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 1px;
  height: 7px;
  background: var(--rule);
}
.calibration span:nth-child(4n+1)::before { background: var(--accent-soft); height: 9px; top: -4px; }

/* ---- Header ---- */
.site-header {
  border-bottom: 1px solid var(--rule);
  padding: 28px 24px 22px;
}
.site-header-inner {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
}
.site-header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.site-logo-icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}
.site-title {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.site-title:hover { color: var(--accent); }
.site-tagline {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate);
}
.site-nav {
  display: flex;
  gap: 20px;
  font-size: 0.92rem;
}
.site-nav a { color: var(--ink-soft); text-decoration: none; }
.site-nav a:hover { color: var(--accent); }

/* ---- Homepage hero ---- */
.hero {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 56px 24px 8px;
}
.hero h1 {
  font-size: 2.1rem;
  max-width: 16ch;
}
.hero p {
  color: var(--ink-soft);
  font-size: 1.08rem;
  max-width: 58ch;
  margin: 0.6em 0 0;
}

/* ---- Post list ---- */
.post-list {
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: 24px 24px 80px;
  display: flex;
  flex-direction: column;
}
.post-card {
  padding: 28px 0;
  border-bottom: 1px solid var(--rule-soft);
  text-decoration: none;
  color: inherit;
  display: block;
}
.post-card:first-child { padding-top: 8px; }
.post-card:hover .post-card-title { color: var(--accent); }
.post-card-meta {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 8px;
}
.pillar-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-soft);
  padding: 2px 8px;
  border-radius: 2px;
}
.post-card-title {
  font-size: 1.4rem;
  margin: 0 0 8px;
  transition: color 0.15s ease;
}
.post-card-excerpt {
  color: var(--ink-soft);
  font-size: 1rem;
  margin: 0;
  max-width: 68ch;
}

/* ---- Article page ---- */
.article-wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 52px 24px 40px;
}
.article-meta { margin-bottom: 6px; }
.article-wrap h1 {
  font-size: 2.05rem;
  margin-top: 0.3em;
}
.article-body p {
  margin: 0 0 1.3em;
}
.article-body h2 {
  font-size: 1.4rem;
  margin-top: 1.7em;
}
.article-body ul, .article-body ol {
  margin: 0 0 1.3em;
  padding-left: 1.3em;
}
.article-body li { margin-bottom: 0.5em; }
.article-body strong { color: var(--ink); }
.article-body hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2.4em 0;
}
.article-body em {
  color: var(--ink-soft);
}
blockquote.disclaimer {
  border-left: 2px solid var(--accent-soft);
  margin: 1.6em 0 0;
  padding: 0.2em 0 0.2em 1.1em;
  font-size: 0.92rem;
  color: var(--slate);
  font-family: 'JetBrains Mono', monospace;
  line-height: 1.6;
}
blockquote.disclaimer strong {
  color: var(--slate);
  font-family: 'Source Sans 3', sans-serif;
}

.back-link {
  display: inline-block;
  margin-bottom: 20px;
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--slate);
}
.back-link:hover { color: var(--accent); }

/* ---- Footer ---- */
.site-footer {
  border-top: 1px solid var(--rule);
  padding: 32px 24px;
  text-align: center;
}
.site-footer p {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  color: var(--slate);
  letter-spacing: 0.03em;
  margin: 0;
}

@media (max-width: 560px) {
  body { font-size: 17px; }
  .hero h1 { font-size: 1.7rem; }
  .article-wrap h1 { font-size: 1.6rem; }
  .site-nav { gap: 14px; font-size: 0.85rem; }
}