/* ─── INFERENCE — design tokens ─────────────────────────────────────── */
:root {
  --abyss: #0d1117;
  --slate: #161b22;
  --slate-2: #1c232c;
  --steel: #30363d;
  --steel-soft: #21262d;
  --ivory: #e6edf3;
  --ash: #8b949e;
  --ash-dim: #6e7681;
  --cobalt: #4f8cff;
  --cobalt-dim: #355fb3;
  --amber: #d4a017;
  --amber-dim: #8a6a0e;

  /* Accent is amber per theme settings; logo bracket stays cobalt (brand spec §01). */
  --bg: var(--abyss);
  --surface: var(--slate);
  --surface-2: var(--slate-2);
  --rule: var(--steel);
  --rule-soft: var(--steel-soft);
  --fg: var(--ivory);
  --fg-dim: var(--ash);
  --fg-mute: var(--ash-dim);
  --accent: var(--amber);
  --emphasis: var(--cobalt);

  --font-ui: "Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-serif: "Source Serif 4", "Source Serif Pro", "Iowan Old Style", Georgia, serif;
  --font-display: "Playfair Display", "Source Serif 4", Georgia, serif;

  --pad: 32px;
  --maxw: 1240px;
  --readw: 720px;

  /* Ghost custom font hook — required by gscan GS051 */
  --gh-font-heading: "Inter", ui-sans-serif, system-ui, sans-serif;
  --gh-font-body: "Source Serif 4", Georgia, serif;
}

/* light theme: typographically restrained, paper-like */
[data-theme="light"] {
  --bg: #f5f1e8;
  --surface: #ede7d8;
  --surface-2: #e3dcc9;
  --rule: #c8bea3;
  --rule-soft: #d6cdb5;
  --fg: #1a1714;
  --fg-dim: #5b554a;
  --fg-mute: #8a8472;
  --accent: var(--amber-dim);
  --emphasis: #1f4fbf;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "ss01", "cv11";
  min-height: 100vh;
  padding-bottom: 28px; /* reserve space for fixed statusbar */
}

::selection { background: var(--cobalt); color: #fff; }

/* ─── primitives ─────────────────────────────────────────────────────── */
.mono { font-family: var(--font-mono); font-variant-ligatures: none; }
.serif { font-family: var(--font-serif); }
.display { font-family: var(--font-display); }
.ash { color: var(--fg-dim); }
.mute { color: var(--fg-mute); }
.cobalt { color: var(--cobalt); }
.amber { color: var(--amber); }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

hr.ascii {
  border: 0;
  color: var(--rule);
  font-family: var(--font-mono);
  font-size: 13px;
  margin: 24px 0;
  overflow: hidden;
  white-space: nowrap;
  line-height: 1;
}
hr.ascii::before {
  content: "────────────────────────────────────────────────────────────────────────────────────────────────────────────";
}

/* logo — bracket is always cobalt per brand spec, never inherits --accent */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-ui);
  font-weight: 700;
  letter-spacing: 0.22em;
  font-size: 13px;
  color: var(--fg);
  text-decoration: none;
}
.logo .br { color: var(--cobalt); font-family: var(--font-mono); font-weight: 500; letter-spacing: -0.05em; }
.logo:hover { text-decoration: none; }

/* page shell */
.shell {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* ─── header ─────────────────────────────────────────────────────────── */
.topbar {
  border-bottom: 1px solid var(--rule);
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 24px;
}
.nav {
  display: flex;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: 12px;
}
.nav a {
  color: var(--fg-dim);
  padding: 6px 12px;
  border-radius: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.nav a:hover { color: var(--fg); text-decoration: none; background: var(--surface); }
.nav a.active { color: var(--fg); }
.nav a.active .prompt { color: var(--accent); }
.nav .prompt { color: var(--fg-mute); }

.tools {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
}

/* language switcher — text link/chip in header tools */
.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-dim);
  letter-spacing: 0.04em;
  text-decoration: none;
  background: transparent;
  transition: background 120ms, color 120ms;
}
.lang-switch:hover {
  color: var(--fg);
  background: var(--surface);
  border-color: var(--fg-dim);
  text-decoration: none;
}

.icon-btn {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--rule);
  color: var(--fg-dim);
}
.icon-btn:hover { color: var(--fg); border-color: var(--fg-dim); }

/* ─── status bar (fixed bottom) ──────────────────────────────────────── */
.statusbar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 40;
  border-top: 1px solid var(--rule);
  background: var(--surface);
  padding: 0 var(--pad);
  height: 28px;
  display: flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.02em;
  gap: 16px;
}
.statusbar .seg { display: inline-flex; align-items: center; gap: 6px; }
.statusbar .seg .k { color: var(--fg-mute); }
.statusbar .seg .v { color: var(--fg-dim); }
.statusbar .ok { color: #3fb950; }
.statusbar .right { margin-left: auto; }

/* blinking caret */
.caret {
  display: inline-block;
  width: 7px;
  height: 13px;
  background: var(--accent);
  vertical-align: -2px;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ─── home ───────────────────────────────────────────────────────────── */
.hero {
  padding: 80px 0 56px;
  border-bottom: 1px solid var(--rule);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--rule-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule-soft) 1px, transparent 1px);
  background-size: 80px 80px;
  background-position: center;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 80%);
  pointer-events: none;
}
.hero-inner { position: relative; }
.hero .meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.hero .meta .dot { width: 6px; height: 6px; border-radius: 50%; background: #3fb950; box-shadow: 0 0 8px #3fb95080; }
.hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(40px, 5.6vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
  color: var(--fg);
  max-width: 1000px;
}
.hero h1 em {
  font-style: italic;
  color: var(--accent);
  font-family: var(--font-display);
}
.hero .lede {
  font-family: var(--font-serif);
  font-size: 21px;
  line-height: 1.55;
  color: var(--fg-dim);
  max-width: 720px;
  margin: 0 0 28px;
}

.author-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 20px 24px;
  border: 1px solid var(--rule);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 13px;
  margin-top: 36px;
  max-width: 800px;
}
.avatar {
  width: 56px;
  height: 56px;
  border: 1px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--accent);
  background: color-mix(in oklab, var(--accent) 8%, transparent);
  letter-spacing: 0.04em;
}
.author-card .name { color: var(--fg); font-weight: 500; font-size: 14px; letter-spacing: 0.02em; }
.author-card .role { color: var(--fg-dim); font-size: 12px; margin-top: 2px; }
.author-card .stats { display: flex; gap: 18px; color: var(--fg-mute); font-size: 11px; letter-spacing: 0.04em; text-transform: uppercase; }
.author-card .stats b { color: var(--fg); display: block; font-weight: 500; font-size: 15px; letter-spacing: 0; text-transform: none; font-family: var(--font-mono); }

/* section heading */
.section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin: 56px 0 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}
.section-heading .title {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.section-heading .title::before { content: "── "; color: var(--rule); }
.section-heading .title::after { content: " ──"; color: var(--rule); }
.section-heading .extra { font-family: var(--font-mono); font-size: 12px; color: var(--fg-mute); }

/* post grid */
.post-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--rule); }
.post-grid > * { border-bottom: 1px solid var(--rule); border-right: 1px solid var(--rule); }
.post-grid > *:nth-child(2n) { border-right: 0; }

.post-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 28px;
  text-decoration: none;
  color: inherit;
  position: relative;
  transition: background 120ms;
}
.post-card:hover { background: var(--surface); text-decoration: none; }
.post-card:hover .ttl { color: var(--accent); }
.post-card .topbits {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.04em;
}
.tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  padding: 2px 8px;
  border: 1px solid color-mix(in oklab, var(--accent) 60%, var(--rule));
  background: color-mix(in oklab, var(--accent) 6%, transparent);
}
/* tag colour overrides by ghost tag slug */
.tag.t-architecture { color: #f0883e; border-color: color-mix(in oklab, #f0883e 60%, var(--rule)); background: color-mix(in oklab, #f0883e 5%, transparent); }
.tag.t-infrastructure { color: #3fb950; border-color: color-mix(in oklab, #3fb950 60%, var(--rule)); background: color-mix(in oklab, #3fb950 5%, transparent); }
.tag.t-ai-ml { color: var(--accent); }
/* also support short slugs used in data-topic attributes */
.tag.t-arch { color: #f0883e; border-color: color-mix(in oklab, #f0883e 60%, var(--rule)); background: color-mix(in oklab, #f0883e 5%, transparent); }
.tag.t-infra { color: #3fb950; border-color: color-mix(in oklab, #3fb950 60%, var(--rule)); background: color-mix(in oklab, #3fb950 5%, transparent); }
.tag.t-ai { color: var(--accent); }

.post-card .ttl {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.post-card .dek {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.5;
  color: var(--fg-dim);
}
.post-card .foot {
  display: flex;
  gap: 12px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.04em;
  margin-top: 4px;
}
.post-card .arrow { color: var(--accent); font-family: var(--font-mono); }

/* featured row */
.feature {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 0;
  border: 1px solid var(--rule);
  margin-bottom: 24px;
}
.feature .left {
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  text-decoration: none;
  color: inherit;
  border-right: 1px solid var(--rule);
  transition: background 150ms;
}
.feature .left:hover { background: var(--surface); text-decoration: none; }
.feature .left:hover .ttl { color: var(--accent); }
.feature .right {
  padding: 28px 36px;
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--fg-dim);
}
.feature .left .topbits { display: flex; align-items: center; gap: 12px; font-family: var(--font-mono); font-size: 11px; color: var(--fg-mute); letter-spacing: 0.04em; }
.feature .left .ttl {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 3.6vw, 44px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin: 4px 0 0;
}
.feature .left .dek {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.55;
  color: var(--fg-dim);
}
.feature .left .foot {
  margin-top: auto;
  display: flex;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--fg-mute);
  letter-spacing: 0.04em;
  padding-top: 16px;
}
.feature .right h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}
.feature .right .kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; }
.feature .right .kv .k { color: var(--fg-mute); }
.feature .right .kv .v { color: var(--fg); }
.feature .right pre {
  margin: 16px 0 0;
  color: var(--fg-dim);
  font-size: 11.5px;
  line-height: 1.6;
  white-space: pre;
  overflow-x: auto;
}
.feature .right pre .c { color: var(--accent); }
.feature .right pre .a { color: var(--emphasis); }

/* ─── archive ────────────────────────────────────────────────────────── */
.archive-head { padding: 64px 0 32px; border-bottom: 1px solid var(--rule); }
.archive-head h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
}
.archive-head .lede { font-family: var(--font-serif); font-size: 19px; color: var(--fg-dim); max-width: 680px; margin: 0; }

.filters {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12px;
  flex-wrap: wrap;
}
.filters .lbl { color: var(--fg-mute); margin-right: 8px; }
.pill {
  padding: 6px 12px;
  border: 1px solid var(--rule);
  color: var(--fg-dim);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  background: transparent;
  cursor: pointer;
  transition: all 120ms;
}
.pill:hover { color: var(--fg); border-color: var(--fg-dim); }
.pill.on { color: #fff; background: var(--accent); border-color: var(--accent); }
.pill.on.t-arch { background: #f0883e; border-color: #f0883e; }
.pill.on.t-infra { background: #3fb950; border-color: #3fb950; }
.pill .count { color: var(--fg-mute); margin-left: 4px; }
.pill.on .count { color: rgba(255,255,255,0.7); }

.archive-row {
  display: grid;
  grid-template-columns: 90px 90px 1fr 130px 60px;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12px;
  align-items: baseline;
  color: inherit;
  text-decoration: none;
  transition: background 120ms;
}
.archive-row:hover { background: var(--surface); text-decoration: none; padding-left: 16px; padding-right: 16px; }
.archive-row:hover .a-title { color: var(--accent); }
.archive-row .a-date { color: var(--fg-mute); letter-spacing: 0.04em; }
.archive-row .a-num { color: var(--fg-mute); letter-spacing: 0.04em; }
.archive-row .a-title { font-family: var(--font-display); font-weight: 700; font-size: 22px; line-height: 1.2; letter-spacing: -0.01em; color: var(--fg); }
.archive-row .a-title small { display: block; font-family: var(--font-serif); font-weight: 400; font-size: 14px; color: var(--fg-dim); margin-top: 4px; letter-spacing: 0; line-height: 1.5; }
.archive-row .a-tag { font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; }
.archive-row .a-tag.t-ai, .archive-row .a-tag.t-ai-ml { color: var(--accent); }
.archive-row .a-tag.t-arch, .archive-row .a-tag.t-architecture { color: #f0883e; }
.archive-row .a-tag.t-infra, .archive-row .a-tag.t-infrastructure { color: #3fb950; }
.archive-row .a-read { text-align: right; color: var(--fg-mute); letter-spacing: 0.04em; }
.archive-list { padding-top: 8px; }

/* archive hero card — interleaved every 5 entries */
.archive-hero {
  display: block;
  position: relative;
  text-decoration: none;
  color: inherit;
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
  padding: 28px 32px 30px 40px;
  transition: background 150ms;
  --hero-accent: var(--accent);
}
.archive-hero.t-ai, .archive-hero.t-ai-ml { --hero-accent: var(--accent); }
.archive-hero.t-arch, .archive-hero.t-architecture { --hero-accent: #f0883e; }
.archive-hero.t-infra, .archive-hero.t-infrastructure { --hero-accent: #3fb950; }
.archive-hero::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--hero-accent);
}
.archive-hero:hover { background: var(--surface-2); text-decoration: none; }
.archive-hero:hover .ah-title { color: var(--hero-accent); }
.archive-hero:hover .ah-cta { color: var(--hero-accent); }

.ah-stamp {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--hero-accent);
  margin-bottom: 18px;
}
.ah-stamp-bar { color: var(--hero-accent); line-height: 1; }
.ah-stamp-sep { color: var(--fg-mute); }
.ah-stamp > span:nth-child(4) { color: var(--fg-mute); letter-spacing: 0.06em; }

.ah-grid {
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 36px;
  align-items: start;
}
.ah-left { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.ah-topbits {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--fg-mute);
  letter-spacing: 0.04em;
  flex-wrap: wrap;
}
.ah-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 2.6vw, 38px);
  line-height: 1.08;
  letter-spacing: -0.018em;
  color: var(--fg);
  margin: 2px 0 0;
  text-wrap: balance;
  transition: color 120ms;
}
.ah-dek {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.55;
  color: var(--fg-dim);
  margin: 0;
  max-width: 56ch;
}
.ah-foot {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--fg-mute);
  letter-spacing: 0.04em;
  margin-top: 6px;
  flex-wrap: wrap;
}
.ah-foot .ah-sep { color: var(--rule); }
.ah-foot .ah-cta { margin-left: auto; color: var(--hero-accent); transition: color 120ms; }

.ah-right {
  border-left: 1px dashed var(--rule);
  padding-left: 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-dim);
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}
.ah-spec { display: flex; flex-direction: column; gap: 5px; }
.ah-spec-row { display: grid; grid-template-columns: 72px 1fr; gap: 14px; align-items: baseline; }
.ah-spec .k { color: var(--fg-mute); }
.ah-spec .v { color: var(--fg); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.ah-cmd {
  margin: 0;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--rule);
  color: var(--fg-dim);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.65;
  white-space: pre;
  overflow-x: auto;
}
.ah-cmd .c { color: var(--hero-accent); }
.ah-cmd .a { color: var(--emphasis); }

/* ─── post page ──────────────────────────────────────────────────────── */
.progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 0;
  background: var(--accent);
  z-index: 100;
  transition: width 50ms linear;
}

.post-header {
  padding: 72px 0 40px;
  border-bottom: 1px solid var(--rule);
}
.post-header .crumbs {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--fg-mute);
  letter-spacing: 0.04em;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.post-header .crumbs a { color: var(--fg-dim); }
.post-header .crumbs a:hover { color: var(--fg); text-decoration: none; }
.post-header .crumbs .sep { color: var(--fg-mute); }
.post-header h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(38px, 5.2vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  max-width: 900px;
  text-wrap: balance;
}
.post-header .lede {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 22px;
  line-height: 1.55;
  color: var(--fg-dim);
  max-width: var(--readw);
  margin: 0 0 32px;
}
.post-header .byline {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 0.04em;
}
.post-header .byline .name { color: var(--fg); }
.post-header .byline .sep { color: var(--fg-mute); }

.post-layout {
  display: grid;
  grid-template-columns: 1fr var(--readw) 1fr;
  gap: 0;
  padding: 56px 0 96px;
}
.post-layout > .sidebar-l { padding-right: 32px; }
.post-layout > .sidebar-r { padding-left: 32px; }
.post-body { min-width: 0; }

/* TOC (left sidebar) */
.toc {
  position: sticky;
  top: 80px;
  font-family: var(--font-mono);
  font-size: 12px;
}
.toc h5 {
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin: 0 0 14px;
  font-weight: 500;
}
.toc ol { list-style: none; padding: 0; margin: 0; counter-reset: toc; }
.toc li { counter-increment: toc; padding: 4px 0; line-height: 1.4; }
.toc li a {
  color: var(--fg-dim);
  display: flex;
  gap: 10px;
  align-items: baseline;
}
.toc li a::before {
  content: counter(toc, decimal-leading-zero);
  color: var(--fg-mute);
  flex-shrink: 0;
  font-size: 10.5px;
}
.toc li.active a { color: var(--fg); }
.toc li.active a::before { color: var(--accent); }
.toc li a:hover { color: var(--fg); text-decoration: none; }

/* right meta sidebar */
.post-meta-side {
  position: sticky;
  top: 80px;
  font-family: var(--font-mono);
  font-size: 11.5px;
}
.post-meta-side h5 {
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin: 24px 0 10px;
  font-weight: 500;
}
.post-meta-side h5:first-child { margin-top: 0; }
.post-meta-side .kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; color: var(--fg-dim); }
.post-meta-side .kv .k { color: var(--fg-mute); }
.post-meta-side .share { display: flex; flex-direction: column; gap: 6px; }
.post-meta-side .share a { color: var(--fg-dim); }
.post-meta-side .share a:hover { color: var(--accent); text-decoration: none; }

/* tags footer on post */
.post-body .tags {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
}
.post-body .tags a { color: var(--fg-mute); }
.post-body .tags a:hover { color: var(--accent); text-decoration: none; }

/* body typography */
.prose {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.65;
  color: var(--fg);
  font-feature-settings: "kern", "liga";
}
.prose p { margin: 0 0 1.1em; }
.prose h2 {
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.3;
  color: var(--accent);
  margin: 56px 0 8px;
  letter-spacing: -0.005em;
  scroll-margin-top: 80px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.prose h2 .num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-mute);
  letter-spacing: 0.04em;
  font-weight: 500;
}
.prose h2 + .h-rule { color: var(--rule); font-family: var(--font-mono); font-size: 12px; line-height: 1; margin-bottom: 24px; overflow: hidden; white-space: nowrap; }
.prose h2 + .h-rule::before { content: "────────────────────────────────────────────────────────────────────────────────"; }
.prose h3 {
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 16px;
  color: var(--fg);
  margin: 36px 0 10px;
}
.prose strong { color: var(--fg); font-weight: 600; }
.prose em { font-style: italic; }
.prose a { color: var(--accent); border-bottom: 1px solid color-mix(in oklab, var(--accent) 40%, transparent); }
.prose a:hover { text-decoration: none; border-bottom-color: var(--accent); }
.prose code {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--emphasis);
  background: var(--surface);
  padding: 1px 5px;
  border: 1px solid var(--rule-soft);
}
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.4em; }
.prose ul li { margin-bottom: 0.4em; }
.prose ul { list-style: none; padding-left: 0; }
.prose ul li::before { content: "─"; color: var(--accent); margin-right: 0.8em; font-family: var(--font-mono); }
.prose blockquote {
  margin: 36px -8px;
  padding: 20px 24px;
  border-left: 3px solid var(--emphasis);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 22px;
  line-height: 1.4;
  color: var(--fg);
  letter-spacing: -0.005em;
}
.prose table {
  margin: 32px 0;
  border: 1px solid var(--rule);
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-ui);
  font-size: 14px;
}
.prose thead { background: var(--surface); }
.prose th {
  text-align: left;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-mute);
  font-weight: 500;
  border-bottom: 1px solid var(--rule);
}
.prose th:first-child { color: var(--accent); }
.prose td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--rule-soft);
  color: var(--fg-dim);
  vertical-align: top;
}
.prose td:first-child { color: var(--fg); font-weight: 500; }
.prose tr:last-child td { border-bottom: 0; }

/* Ghost Koenig card width classes — required by gscan */
.kg-width-wide  { margin-left: calc(25% - 25vw); margin-right: calc(25% - 25vw); }
.kg-width-full  { margin-left: calc(50% - 50vw);  margin-right: calc(50% - 50vw); }

/* Koenig code card */
.kg-code-card pre {
  margin: 28px 0;
  padding: 20px 24px;
  background: var(--surface);
  border: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  overflow-x: auto;
  color: var(--fg);
}

/* Ghost members upgrade CTA */
.gh-post-upgrade-cta {
  margin: 48px 0;
  padding: 32px;
  border: 1px solid var(--rule);
  background: var(--surface);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 13px;
}
.gh-post-upgrade-cta p { color: var(--fg-dim); margin: 0 0 16px; }
.gh-post-upgrade-cta a {
  display: inline-block;
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.gh-post-upgrade-cta a:hover { text-decoration: none; opacity: 0.9; }

/* ─── about / static pages ───────────────────────────────────────────── */
.about-hero { padding: 80px 0 48px; border-bottom: 1px solid var(--rule); display: grid; grid-template-columns: 1.5fr 1fr; gap: 64px; align-items: end; }
.about-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}
.about-hero .lede { font-family: var(--font-serif); font-size: 21px; line-height: 1.55; color: var(--fg-dim); margin: 0; }
.about-hero .right {
  border: 1px solid var(--rule);
  background: var(--surface);
  padding: 20px 22px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
}
.about-hero .right .key { color: var(--fg-mute); }
.about-hero .right .val { color: var(--fg); }
.about-hero .right .row { display: grid; grid-template-columns: 110px 1fr; gap: 14px; padding: 4px 0; }

.about-body { padding: 64px 0; display: grid; grid-template-columns: 220px 1fr; gap: 64px; }
.about-body aside { position: sticky; top: 80px; align-self: start; font-family: var(--font-mono); font-size: 12px; }
.about-body aside h5 { font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--fg-mute); margin: 0 0 12px; font-weight: 500; }
.about-body aside .toc-a { list-style: none; padding: 0; margin: 0 0 32px; }
.about-body aside .toc-a li { padding: 4px 0; }
.about-body aside .toc-a a { color: var(--fg-dim); }
.about-body aside .toc-a a:hover { color: var(--fg); text-decoration: none; }

.about-section { margin-bottom: 56px; }
.about-section h2 {
  font-family: var(--font-ui);
  font-size: 20px;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 4px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.about-section h2 .num { font-family: var(--font-mono); font-size: 12px; color: var(--fg-mute); }
.about-section .h-rule { color: var(--rule); font-family: var(--font-mono); font-size: 12px; line-height: 1; margin-bottom: 20px; overflow: hidden; white-space: nowrap; }
.about-section .h-rule::before { content: "──────────────────────────────────────────────────────────────────"; }
.about-section .body { font-family: var(--font-serif); font-size: 17px; line-height: 1.65; color: var(--fg); max-width: 680px; }
.about-section .body p { margin: 0 0 1.1em; }

.topic-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0; border: 1px solid var(--rule); margin-top: 20px; }
.topic-grid > div { padding: 22px; border-right: 1px solid var(--rule); }
.topic-grid > div:last-child { border-right: 0; }
.topic-grid h4 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}
.topic-grid p { font-family: var(--font-serif); font-size: 14px; line-height: 1.55; color: var(--fg-dim); margin: 0; }

/* page footer */
.pagefoot {
  border-top: 1px solid var(--rule);
  padding: 56px 0 88px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-dim);
  line-height: 1.7;
}
.pagefoot h5 {
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-mute);
  margin: 0 0 14px;
  font-weight: 500;
}
.pagefoot a { color: var(--fg-dim); display: block; }
.pagefoot a:hover { color: var(--fg); text-decoration: none; }
.pagefoot .brand .tagline { color: var(--fg-dim); margin-top: 16px; max-width: 320px; font-family: var(--font-serif); font-style: italic; font-size: 14px; line-height: 1.5; }
.pagefoot .brand .copy { color: var(--fg-mute); margin-top: 24px; font-size: 11px; letter-spacing: 0.04em; }

/* ─── responsive ─────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .feature { grid-template-columns: 1fr; }
  .feature .left { border-right: 0; border-bottom: 1px solid var(--rule); }
  .post-layout { grid-template-columns: 1fr; }
  .post-layout > .sidebar-l, .post-layout > .sidebar-r { display: none; }
  .about-hero { grid-template-columns: 1fr; gap: 24px; }
  .about-body { grid-template-columns: 1fr; gap: 24px; }
  .about-body aside { position: static; }
  .topic-grid { grid-template-columns: 1fr; }
  .topic-grid > div { border-right: 0; border-bottom: 1px solid var(--rule); }
  .post-grid { grid-template-columns: 1fr; }
  .post-grid > * { border-right: 0; }
  .archive-row { grid-template-columns: 80px 1fr; gap: 12px; }
  .archive-row .a-num, .archive-row .a-tag, .archive-row .a-read { display: none; }
  .pagefoot { grid-template-columns: 1fr 1fr; gap: 32px; }
  .ah-grid { grid-template-columns: 1fr; gap: 20px; }
  .ah-right { border-left: 0; border-top: 1px dashed var(--rule); padding-left: 0; padding-top: 16px; }
}
@media (max-width: 600px) {
  :root { --pad: 16px; }
  .topbar-inner { height: 48px; }
  .nav a { padding: 4px 8px; }
  .pagefoot { grid-template-columns: 1fr; }
  .statusbar { gap: 8px; }
  .statusbar .seg:nth-child(n+3):not(.right) { display: none; }
}