/* ============================================================
   GenAIRR — bench-science palette v2
   No orange/amber/maple. Mono-forward. Hairline rules.
   ============================================================ */

:root {
  /* Type — IBM Plex (institutional/scientific) */
  --font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-serif: "IBM Plex Serif", Georgia, serif;

  /* Surfaces — paper white, very subtle warmth so it's not clinical */
  --bg: #fafaf7;
  --bg-soft: #f1f1ec;
  --bg-card: #ffffff;
  --rule: #e4e4dd;
  --rule-strong: #c8c8c0;

  /* Ink — near-black, true neutral (no blue cast) */
  --ink: #0e0e10;
  --ink-soft: #3a3b40;
  --ink-muted: #6f7079;

  /* Three-color system — each has a clear role */
  --accent: #1f8a4c;          /* GREEN — affirmative, ground truth, V-segment, primary CTA */
  --accent-ink: #145e34;
  --accent-soft: #e0eee5;

  --info: #1d4ed8;            /* COBALT — interactive, links, code, lesson route */
  --info-ink: #15399e;
  --info-soft: #e2e8fb;

  --archive: #6e3a8e;         /* PLUM — lesson numbers, scholarly callouts, learn track */
  --archive-ink: #4d2563;
  --archive-soft: #efe6f5;

  /* Cool data hues — used inside visualizers AND select UI accents */
  --data-blue:  #1d4ed8;   /* D segment, info accent */
  --data-plum:  #6e3a8e;   /* J segment, archive accent */
  --data-cyan:  #0d7a8a;   /* mutations / live ticks */
  --data-slate: #535560;   /* NP, neutral data */
  --data-rust:  #9a3a3a;   /* deletions / errors only */

  /* Sequence palette — V/D/J kept distinct but harmonious */
  --seg-v:   #1f8a4c;      /* V = accent green */
  --seg-d:   #1d4ed8;      /* D = cobalt */
  --seg-j:   #6e3a8e;      /* J = plum */
  --seg-np:  #6f7079;      /* NP = muted slate */
  --seg-umi: #0d7a8a;      /* UMI = cyan */
  --seg-mut: #0d7a8a;      /* mutation = cyan, bold */
  --seg-n:   #9aa3ad;
  --seg-del: #9a3a3a;

  /* No legacy aliases — old refs map to neutral */
  --teal: var(--accent);
  --teal-soft: var(--accent-soft);
  --primary: var(--ink);
  --primary-ink: #000;
  --primary-soft: var(--bg-soft);
  --sky: var(--accent);
  --sky-soft: var(--accent-soft);
  --amber: var(--accent);
  --amber-soft: var(--accent-soft);
  --amber-ink: var(--accent-ink);

  --radius-sm: 3px;
  --radius: 6px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 0 rgba(14,14,16,0.04);
  --shadow: 0 1px 0 rgba(14,14,16,0.04), 0 6px 18px -10px rgba(14,14,16,0.12);
  --shadow-lg: 0 18px 50px -22px rgba(14,14,16,0.22);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--ink); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; text-decoration-color: var(--rule-strong); }
a:hover { text-decoration-color: var(--info); color: var(--info-ink); }

code, pre, .mono { font-family: var(--font-mono); }
pre { margin: 0; }

h1, h2, h3, h4 { font-weight: 500; letter-spacing: -0.01em; color: var(--ink); }
h1 { font-size: clamp(2.4rem, 4.6vw, 4rem); line-height: 1.02; letter-spacing: -0.035em; font-weight: 400; }
h2 { font-size: 1.6rem; line-height: 1.2; font-weight: 500; }
h3 { font-size: 1.05rem; line-height: 1.3; font-weight: 600; }

.serif { font-family: var(--font-serif); font-weight: 400; }
.mute { color: var(--ink-muted); }

/* ============================================================
   Top nav — minimal, hairline rule, mono brand
   ============================================================ */

.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 250, 247, 0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 16px 28px;
  display: flex; align-items: center; gap: 32px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono);
  font-size: 14px; font-weight: 500; letter-spacing: -0.01em;
  color: var(--ink); text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 22px; height: 22px;
  border: 1.5px solid var(--ink);
  display: grid; place-items: center;
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: var(--ink);
  position: relative;
}
.brand-mark::after { content: none; }
.nav-links { display: flex; gap: 24px; flex: 1; font-size: 13px; font-family: var(--font-mono); }
.nav-links a { color: var(--ink-soft); text-decoration: none; }
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); }
.nav-links a.active::after { content: ""; display: block; height: 2px; background: var(--info); margin-top: 4px; }
.nav-cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px;
  background: var(--ink); color: #fff;
  font-family: var(--font-mono);
  font-size: 12px; font-weight: 500;
  text-decoration: none;
  border-radius: 0;
}
.nav-cta:hover { background: var(--accent-ink); color: #fff; text-decoration: none; }

/* ============================================================
   Layout
   ============================================================ */

.page { max-width: 1200px; margin: 0 auto; padding: 0 28px; }
.section { padding: 96px 0; border-top: 1px solid var(--rule); }
.section:first-of-type { border-top: 0; }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px; font-weight: 500;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--info-ink);
  background: transparent;
  padding: 0;
}
.eyebrow::before { content: "// "; color: var(--info); }

.section-head { max-width: 720px; margin: 0 0 56px; }
.section-head h2 { margin: 14px 0 14px; }
.section-head p { color: var(--ink-soft); font-size: 1.04rem; line-height: 1.65; max-width: 60ch; }

/* ============================================================
   Buttons — flat, square, mono labels
   ============================================================ */

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 18px; border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 13px; font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer; user-select: none;
  text-decoration: none;
  transition: background 0.12s ease, color 0.12s ease;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--accent-ink); color: #fff; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: #fff; }
.btn-amber { background: var(--accent); color: #fff; }
.btn-amber:hover { background: var(--accent-ink); color: #fff; }

/* ============================================================
   Sequence renderer
   ============================================================ */

.seq {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  line-height: 1.7;
  word-break: break-all;
}
.seq .b { display: inline-block; }
.seq .b-v   { color: var(--seg-v);   font-weight: 600; }
.seq .b-d   { color: var(--seg-d);   font-weight: 600; }
.seq .b-j   { color: var(--seg-j);   font-weight: 600; }
.seq .b-np  { color: var(--seg-np); }
.seq .b-umi { color: var(--seg-umi); }
.seq .b-mut { color: var(--seg-mut); font-weight: 700; text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
.seq .b-n   { color: var(--seg-n); background: rgba(154,163,173,0.14); }
.seq .b-pcr { color: var(--seg-mut); font-weight: 700; }
.seq .b-del { color: var(--seg-del); text-decoration: line-through; opacity: 0.55; }
.seq .b-ins { color: var(--seg-mut); background: var(--accent-soft); }

/* legend */
.legend { display: flex; flex-wrap: wrap; gap: 14px 18px; font-size: 12px; color: var(--ink-soft); font-family: var(--font-mono); }
.legend .chip { display: inline-flex; align-items: center; gap: 6px; }
.legend .sw { width: 10px; height: 10px; border-radius: 0; }
.sw-v   { background: var(--seg-v); }
.sw-d   { background: var(--seg-d); }
.sw-j   { background: var(--seg-j); }
.sw-np  { background: var(--seg-np); }
.sw-umi { background: var(--seg-umi); }
.sw-mut { background: var(--seg-mut); }
.sw-n   { background: var(--seg-n); }

/* ============================================================
   Card / panel
   ============================================================ */

.card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.card-pad { padding: 22px 24px; }
.card-head {
  padding: 12px 18px; border-bottom: 1px solid var(--rule);
  display: flex; align-items: center; gap: 10px;
  font-size: 12px; color: var(--ink-soft);
  font-family: var(--font-mono);
}
.card-head .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--rule-strong); }

/* ============================================================
   Code window — tighter, less chrome, paper-like dark
   ============================================================ */

.code-window {
  background: #0e0e10;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid #1c1c1f;
  box-shadow: var(--shadow);
}
.code-window-head {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 14px;
  background: #16161a;
  border-bottom: 1px solid #1c1c1f;
  color: #9a9b9f; font-size: 12px;
  font-family: var(--font-mono);
}
.code-window-head .traffic { display: flex; gap: 6px; }
.code-window-head .traffic span {
  width: 9px; height: 9px; border-radius: 50%;
  background: #2a2a2e;
}
.code-window-body {
  padding: 18px 22px;
  font-family: var(--font-mono);
  font-size: 13px; line-height: 1.75;
  color: #d6d6d2;
  overflow-x: auto;
}
.code-window-body .kw  { color: #c5a5e0; }
.code-window-body .str { color: #a3d39c; }
.code-window-body .fn  { color: #7fb6d4; }
.code-window-body .num { color: #d4a072; }
.code-window-body .at  { color: #d6c285; }
.code-window-body .cm  { color: #6c6d72; font-style: italic; }

/* ============================================================
   HOMEPAGE — hero (editorial, mono labels, single accent rule)
   ============================================================ */

.hero {
  padding: 80px 0 64px;
  position: relative;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px;
  align-items: center;
}
.hero h1 {
  margin: 22px 0 22px;
  font-weight: 400;
}
.hero h1 .accent {
  color: var(--ink);
  font-style: italic;
  font-family: var(--font-serif);
  font-weight: 400;
  border-bottom: 3px solid var(--accent);
  padding-bottom: 1px;
}
.hero-sub {
  font-size: 1.12rem;
  color: var(--ink-soft);
  line-height: 1.6;
  max-width: 52ch;
  margin: 0 0 32px;
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 40px; }
.hero-meta {
  display: flex; gap: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12px;
}
.hero-meta .stat .n { font-family: var(--font-mono); font-size: 1.5rem; font-weight: 500; color: var(--ink); display: block; letter-spacing: -0.02em; line-height: 1.1; }
.hero-meta .stat .l { color: var(--ink-muted); font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; margin-top: 4px; display: block; }

/* hero visual — sequence assembly card */
/* ============================================================
   HERO — V(D)J recombination workbench
   ============================================================ */

.bench {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.bench-head {
  padding: 12px 18px;
  border-bottom: 1px solid var(--rule);
  display: flex; align-items: center; justify-content: space-between;
  background: var(--bg);
}
.bench-title {
  font-family: var(--font-mono); color: var(--ink-soft);
  letter-spacing: 0.02em; font-size: 11px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.bench-title em { color: var(--info); font-style: normal; }
.bench-title #bench-seed { color: var(--ink); font-style: normal; transition: opacity 0.2s; }
.bench-live {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 11px; color: var(--accent-ink);
  letter-spacing: 0.06em; text-transform: uppercase;
  flex-shrink: 0; margin-left: 12px;
}
.bench-live-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent); animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.35; transform: scale(0.8); } }

.bench-stage {
  padding: 18px 20px 8px;
  background: var(--bg-card);
  background-image:
    linear-gradient(rgba(14,14,16,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,14,16,0.022) 1px, transparent 1px);
  background-size: 24px 24px;
  position: relative;
}

/* gene-library rack */
.rack {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
  margin-bottom: 16px;
}
.rack-col {
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: var(--bg);
  padding: 8px 9px 6px;
  position: relative;
  overflow: hidden;
}
.rack-label {
  font-family: var(--font-mono);
  font-size: 9.5px; color: var(--ink-muted);
  letter-spacing: 0.1em; text-transform: uppercase;
  margin-bottom: 6px;
}
.rack-list {
  display: flex; flex-direction: column;
  gap: 2px;
  height: 70px;
  overflow: hidden;
  position: relative;
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1.4;
  color: var(--ink-muted);
}
.rack-item {
  padding: 1px 4px;
  white-space: nowrap;
  border-radius: 2px;
  transition: background 0.18s, color 0.18s;
}
.rack-item.is-flicker { color: var(--ink-soft); }
.rack-item.is-picked {
  color: #fff;
  font-weight: 600;
  background: var(--seg-v);
  box-shadow: 0 0 0 1px var(--seg-v) inset;
}
.rack-col[data-rack="d"] .rack-item.is-picked { background: var(--seg-d); }
.rack-col[data-rack="j"] .rack-item.is-picked { background: var(--seg-j); }
.rack-col.is-active { border-color: var(--ink); box-shadow: 0 0 0 2px rgba(14,14,16,0.06); }
.rack-col.is-done .rack-list { opacity: 0.55; }

/* step narration line */
.bench-step {
  display: flex; align-items: baseline; gap: 12px;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
  margin-bottom: 14px;
  min-height: 38px;
}
.bench-step-num {
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  color: var(--accent); letter-spacing: 0.1em;
  background: var(--accent-soft); padding: 2px 6px; border-radius: 2px;
  flex-shrink: 0;
}
.bench-step-name {
  font-size: 13px; color: var(--ink); font-weight: 500;
  flex: 1;
}
.bench-step-fn {
  font-family: var(--font-mono); font-size: 10.5px; color: var(--ink-muted);
  flex-shrink: 0;
}

/* the molecule under construction */
.molecule {
  position: relative;
  padding: 8px 0 4px;
}
.molecule-ruler {
  height: 14px;
  font-family: var(--font-mono);
  font-size: 9px; color: var(--ink-muted);
  position: relative;
  letter-spacing: 0;
  margin-bottom: 4px;
}
.molecule-ruler .tick {
  position: absolute; top: 0;
  display: flex; flex-direction: column; align-items: center;
  font-variant-numeric: tabular-nums;
}
.molecule-ruler .tick::before {
  content: ""; width: 1px; height: 4px;
  background: var(--rule-strong);
  margin-bottom: 1px;
}
.molecule-track {
  height: 32px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
  position: relative;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
}
.molecule-track .molecule-empty {
  color: var(--ink-muted);
  font-size: 11px;
  letter-spacing: 0.06em;
  width: 100%; text-align: center;
}
.molecule-track .seg {
  position: absolute; top: 0; bottom: 0;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 600;
  white-space: nowrap; overflow: hidden;
  transition: left 0.5s cubic-bezier(.4,.1,.2,1), width 0.5s cubic-bezier(.4,.1,.2,1), opacity 0.3s;
}
.molecule-track .seg-v   { background: var(--seg-v); }
.molecule-track .seg-d   { background: var(--seg-d); }
.molecule-track .seg-j   { background: var(--seg-j); }
.molecule-track .seg-np1, .molecule-track .seg-np2 {
  background: repeating-linear-gradient(45deg, var(--seg-np), var(--seg-np) 3px, #8a8b93 3px, #8a8b93 6px);
  color: #fff;
}
.molecule-track .seg.is-trimming { animation: trimShake 0.4s ease-out; }
@keyframes trimShake {
  0% { filter: brightness(1); }
  50% { filter: brightness(1.4) saturate(0.6); }
  100% { filter: brightness(1); }
}
.molecule-track .seg-label {
  font-size: 10px; letter-spacing: 0.04em;
  text-shadow: 0 1px 0 rgba(0,0,0,0.15);
  padding: 0 4px;
  pointer-events: none;
}

/* provenance band — appears at end */
.molecule-prov {
  height: 18px;
  position: relative;
  margin-top: 6px;
  opacity: 0;
  transition: opacity 0.4s;
}
.molecule-prov.is-shown { opacity: 1; }
.molecule-prov .pv {
  position: absolute; top: 0; bottom: 0;
  border-top: 2px solid currentColor;
  display: flex; align-items: flex-end; justify-content: center;
  font-family: var(--font-mono); font-size: 8.5px;
  letter-spacing: 0.04em;
  padding-top: 2px;
  white-space: nowrap;
}
.molecule-prov .pv-v   { color: var(--seg-v); }
.molecule-prov .pv-d   { color: var(--seg-d); }
.molecule-prov .pv-j   { color: var(--seg-j); }
.molecule-prov .pv-np  { color: var(--seg-np); }

/* trim chips that float over the molecule */
.molecule-track .trim-chip {
  position: absolute;
  font-family: var(--font-mono);
  font-size: 9px; color: var(--ink);
  background: #fff;
  border: 1px solid var(--ink);
  padding: 1px 5px;
  border-radius: 2px;
  pointer-events: none;
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 0.25s, transform 0.25s;
  z-index: 3;
  white-space: nowrap;
}
.molecule-track .trim-chip.is-shown { opacity: 1; transform: translateY(0); }

/* foot — ground-truth fields */
.bench-foot {
  border-top: 1px solid var(--rule);
  padding: 14px 18px;
  background: var(--bg);
}
.bench-fields {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px 18px;
  font-family: var(--font-mono);
  font-size: 11px;
}
.bf {
  display: flex; flex-direction: column;
  gap: 1px;
  min-width: 0;
}
.bf-k {
  color: var(--ink-muted);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.bf-v {
  color: var(--ink);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.2s;
}
.bf-v.is-fresh { color: var(--accent-ink); animation: bfFlash 0.6s ease-out; }
@keyframes bfFlash {
  0% { background: var(--accent-soft); }
  100% { background: transparent; }
}

/* ============================================================
   HOMEPAGE — feature strip + DSL
   ============================================================ */

.feat-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.feat {
  background: transparent;
  padding: 32px 28px;
  border-left: 1px solid var(--rule);
}
.feat:first-child { border-left: 0; }
.feat .num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--info-ink);
  text-transform: uppercase;
}
.feat .num::before { content: "// "; color: var(--info); }
.feat h3 { margin: 12px 0 10px; font-weight: 500; font-size: 1.05rem; }
.feat p { color: var(--ink-soft); margin: 0; font-size: 0.95rem; line-height: 1.6; }

/* DSL split */
.dsl-grid {
  display: grid; grid-template-columns: 1fr 1.1fr; gap: 40px;
  align-items: center;
}
.phase-list {
  display: flex; flex-direction: column;
  border: 1px solid var(--rule); border-radius: var(--radius);
  background: var(--bg-card);
  overflow: hidden;
}
.phase {
  display: grid; grid-template-columns: 56px 1fr auto;
  gap: 16px; align-items: center;
  padding: 16px 20px;
  border-top: 1px solid var(--rule);
  cursor: pointer;
}
.phase:first-child { border-top: 0; }
.phase:hover { background: var(--bg); }
.phase .ph-num {
  font-family: var(--font-mono);
  font-size: 11px; color: var(--ink-muted);
  letter-spacing: 0.1em;
}
.phase .ph-method {
  font-family: var(--font-mono); font-weight: 500;
  font-size: 14px;
  color: var(--ink);
}
.phase .ph-desc { font-size: 13px; color: var(--ink-muted); margin-top: 3px; }
.phase .ph-bar { width: 6px; height: 6px; border-radius: 0; background: var(--rule-strong); }
.phase[data-phase="recombine"] .ph-bar { background: var(--seg-v); }
.phase[data-phase="mutate"]    .ph-bar { background: var(--seg-d); }
.phase[data-phase="prepare"]   .ph-bar { background: var(--seg-umi); }
.phase[data-phase="sequence"]  .ph-bar { background: var(--seg-j); }
.phase[data-phase="observe"]   .ph-bar { background: var(--data-rust); }

/* ============================================================
   LEARN — track index
   ============================================================ */

.track-hero { padding: 80px 0 32px; }
.track-hero h1 { font-size: clamp(2rem, 3.4vw, 2.8rem); font-weight: 400; }
.track-hero .lead { font-size: 1.08rem; color: var(--ink-soft); max-width: 60ch; margin-top: 16px; line-height: 1.6; }

.lesson-list {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: transparent;
}
.lesson {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: 24px;
  padding: 26px 0;
  border-top: 1px solid var(--rule);
  align-items: start;
  cursor: pointer;
  transition: background 0.12s ease;
  text-decoration: none;
  color: var(--ink);
}
.lesson:first-child { border-top: 0; }
.lesson:hover { text-decoration: none; }
.lesson:hover .l-title { color: var(--archive-ink); }
.lesson .l-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--archive);
  letter-spacing: 0.08em;
  padding-top: 5px;
  font-weight: 500;
}
.lesson .l-title { font-weight: 500; font-size: 1.18rem; margin: 0 0 6px; color: var(--ink); transition: color 0.12s ease; }
.lesson .l-desc { font-size: 0.95rem; color: var(--ink-soft); margin: 0; line-height: 1.55; max-width: 60ch; }
.lesson .l-meta {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted); text-align: right;
  display: flex; flex-direction: column; gap: 4px;
  align-items: flex-end;
  white-space: nowrap;
  padding-top: 5px;
}
.lesson .l-time { color: var(--ink-soft); }

/* ============================================================
   LESSON page
   ============================================================ */

.lesson-page { padding: 56px 0 96px; max-width: 760px; margin: 0 auto; }
.lesson-crumbs { font-family: var(--font-mono); font-size: 12px; color: var(--ink-muted); margin-bottom: 22px; }
.lesson-crumbs a { color: var(--ink-muted); text-decoration: none; }
.lesson-crumbs a:hover { color: var(--info-ink); }
.lesson-crumbs .sep { margin: 0 8px; }
.lesson-page h1 { font-size: clamp(2rem, 3.4vw, 2.6rem); margin: 8px 0 16px; font-weight: 400; }
.lesson-page .deck { font-size: 1.18rem; color: var(--ink-soft); line-height: 1.55; max-width: 60ch; }
.lesson-progress {
  display: flex; gap: 5px; margin: 24px 0 40px;
  align-items: center;
}
.lesson-progress .seg-bar { width: 32px; height: 2px; border-radius: 0; background: var(--rule-strong); }
.lesson-progress .seg-bar.active { background: var(--accent); height: 3px; }
.lesson-progress .seg-bar.done { background: var(--archive); }
.lesson-progress .meta { font-family: var(--font-mono); font-size: 11px; color: var(--ink-muted); margin-left: 10px; letter-spacing: 0.08em; }

.lesson-page h2 {
  margin: 64px 0 14px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  font-weight: 500;
}
.lesson-page h2:first-of-type { border-top: 0; padding-top: 0; }
.lesson-page p { font-size: 1.02rem; color: var(--ink); line-height: 1.7; max-width: 65ch; }
.lesson-page p.intuition {
  font-family: var(--font-serif);
  font-size: 1.18rem;
  color: var(--ink);
  line-height: 1.55;
  max-width: 60ch;
  padding-left: 20px;
  border-left: 3px solid var(--archive);
  margin: 24px 0;
  font-style: italic;
}
.lesson-page ul { padding-left: 22px; }
.lesson-page ul li { margin: 6px 0; line-height: 1.6; }
.lesson-page strong { font-weight: 600; }
.lesson-page code:not([class*="hljs"]):not(pre code) {
  background: var(--bg-soft);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: var(--font-mono);
}

/* try-it block — restrained, hairline rule */
.try {
  margin: 32px 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--bg-card);
  overflow: hidden;
}
.try-head {
  padding: 11px 18px;
  border-bottom: 1px solid var(--rule);
  display: flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--info-ink);
  letter-spacing: 0.1em; text-transform: uppercase;
  background: var(--info-soft);
}
.try-head::before {
  content: "▸"; color: var(--info); font-size: 12px;
}
.try-body { padding: 18px 22px; font-size: 0.97rem; line-height: 1.65; }
.try-body p { margin: 0 0 12px; }

/* exercise — dashed rule, mono tag */
.exercise {
  margin: 36px 0;
  padding: 20px 22px;
  border: 1px dashed var(--archive);
  border-radius: var(--radius);
  background: var(--archive-soft);
}
.exercise .ex-tag {
  display: inline-block;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--archive-ink);
  letter-spacing: 0.14em; text-transform: uppercase;
  margin-bottom: 8px;
}
.exercise .ex-tag::before { content: "❯ "; color: var(--archive); }
.exercise p { margin: 0; }

/* nav between lessons */
.lesson-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
  margin-top: 72px;
}
.lesson-nav a {
  display: block; padding: 20px 22px;
  border: 1px solid var(--rule); border-radius: var(--radius);
  background: var(--bg-card); color: var(--ink);
  font-size: 0.92rem; line-height: 1.4;
  text-decoration: none;
  transition: border-color 0.12s ease;
}
.lesson-nav a:hover { border-color: var(--info); text-decoration: none; }
.lesson-nav .ln-label { font-family: var(--font-mono); font-size: 11px; color: var(--ink-muted); letter-spacing: 0.08em; text-transform: uppercase; }
.lesson-nav .ln-title { font-weight: 500; margin-top: 6px; }
.lesson-nav .next { text-align: right; }

/* ============================================================
   Visualizers
   ============================================================ */

/* Pipeline scrubber */
.scrubber {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--bg-card);
  overflow: hidden;
  margin: 28px 0;
}
.scrubber-stage {
  padding: 28px 28px 16px;
  background: var(--bg-card);
  background-image:
    linear-gradient(rgba(14,14,16,0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,14,16,0.022) 1px, transparent 1px);
  background-size: 22px 22px;
}
.scrubber-seq {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 13px; line-height: 1.8;
  word-break: break-all;
  min-height: 70px;
}
.scrubber-meta {
  margin-top: 16px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px;
}
.scrubber-meta .m {
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 10px 12px;
  font-size: 12px;
}
.scrubber-meta .m .k { color: var(--ink-muted); font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.06em; text-transform: uppercase; }
.scrubber-meta .m .v { font-family: var(--font-mono); font-size: 13px; color: var(--ink); margin-top: 4px; font-weight: 500; }

.scrubber-controls {
  border-top: 1px solid var(--rule);
  padding: 18px 24px;
  background: var(--bg);
}
.scrubber-track { position: relative; height: 38px; display: flex; align-items: center; }
.scrubber-line {
  position: absolute; left: 0; right: 0; top: 50%; height: 1px;
  background: var(--rule-strong);
  transform: translateY(-50%);
}
.scrubber-stops {
  position: relative; width: 100%;
  display: flex; justify-content: space-between;
}
.scrubber-stop {
  position: relative; z-index: 1;
  background: var(--bg);
  border: 1.5px solid var(--rule-strong);
  width: 12px; height: 12px; border-radius: 50%;
  cursor: pointer;
  transition: all 0.12s ease;
}
.scrubber-stop.passed { background: var(--info); border-color: var(--info); }
.scrubber-stop.active {
  background: var(--accent); border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
  transform: scale(1.15);
}
.scrubber-labels {
  display: flex; justify-content: space-between;
  margin-top: 10px;
  font-family: var(--font-mono); font-size: 10px;
  color: var(--ink-muted);
  letter-spacing: 0.06em; text-transform: uppercase;
}
.scrubber-labels span { width: 80px; text-align: center; transform: translateX(-50%) translateX(6px); }
.scrubber-labels span:first-child { transform: translateX(-6px); text-align: left; }
.scrubber-labels span:last-child { transform: translateX(-94px); text-align: right; }
.scrubber-labels span.active { color: var(--accent-ink); font-weight: 600; }

/* SHM heatmap */
.heatmap {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 24px;
  margin: 28px 0;
}
.heatmap-row {
  display: grid;
  grid-template-columns: 92px 1fr;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
  font-family: var(--font-mono); font-size: 12px;
}
.heatmap-row .lab { color: var(--ink-muted); text-align: right; font-size: 11px; letter-spacing: 0.04em; }
.heatmap-cells { display: flex; gap: 2px; }
.heatmap-cells .cell {
  flex: 1;
  height: 22px;
  border-radius: 0;
  background: var(--bg-soft);
}
.heatmap-cells .cell[data-h="1"] { background: rgba(13,122,138,0.18); }
.heatmap-cells .cell[data-h="2"] { background: rgba(13,122,138,0.40); }
.heatmap-cells .cell[data-h="3"] { background: rgba(13,122,138,0.65); }
.heatmap-cells .cell[data-h="4"] { background: rgba(31,138,76,0.75); }
.heatmap-cells .cell[data-h="5"] { background: rgba(31,138,76,0.95); }
.heatmap-axis { display: flex; justify-content: space-between; margin-top: 8px; padding-left: 106px; font-family: var(--font-mono); font-size: 10px; color: var(--ink-muted); letter-spacing: 0.04em; }

/* Corruption visualizer */
.corruption {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--bg-card);
  margin: 28px 0;
  overflow: hidden;
}
.corruption-stage {
  padding: 22px 24px;
  background: var(--bg-card);
}
.corruption-line {
  display: grid;
  grid-template-columns: 110px 1fr;
  align-items: center;
  gap: 14px;
  margin-bottom: 8px;
  font-family: var(--font-mono); font-size: 12px;
}
.corruption-line .lab { color: var(--ink-muted); font-size: 10px; text-align: right; letter-spacing: 0.06em; text-transform: uppercase; }
.corruption-controls {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  padding: 18px 24px;
  background: var(--bg);
  border-top: 1px solid var(--rule);
}
.toggle { display: flex; flex-direction: column; gap: 6px; }
.toggle .t-name { font-family: var(--font-mono); font-size: 10px; color: var(--ink-soft); letter-spacing: 0.08em; text-transform: uppercase; }
.toggle input[type=range] {
  -webkit-appearance: none; width: 100%; height: 2px;
  background: var(--rule-strong); border-radius: 0; outline: none;
}
.toggle input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px;
  background: var(--accent); border-radius: 50%; cursor: pointer;
}
.toggle input[type=range]::-moz-range-thumb {
  width: 14px; height: 14px;
  background: var(--accent); border: 0; border-radius: 50%; cursor: pointer;
}
.toggle .t-val { font-family: var(--font-mono); font-size: 11px; color: var(--accent-ink); font-weight: 600; }

/* Side-by-side compare */
.compare {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 28px 0;
}
.compare-side { background: var(--bg-card); }
.compare-side + .compare-side { border-left: 1px solid var(--rule); }
.compare-head {
  padding: 12px 18px;
  border-bottom: 1px solid var(--rule);
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-soft);
  letter-spacing: 0.1em; text-transform: uppercase;
  background: var(--bg);
}
.compare-head .badge {
  font-family: var(--font-mono);
  font-size: 10px; padding: 2px 8px;
  border-radius: 0;
  letter-spacing: 0.12em; text-transform: uppercase;
  font-weight: 500;
}
.compare-head .badge.real { background: var(--bg-soft); color: var(--ink-muted); border: 1px solid var(--rule-strong); }
.compare-head .badge.gt { background: var(--accent); color: #fff; }

.compare-body { padding: 16px 18px; font-family: var(--font-mono); font-size: 12px; line-height: 1.85; white-space: pre; }
.compare-body .key { color: var(--ink-muted); }
.compare-body .qm { color: var(--data-rust); font-weight: 600; }
.compare-body .ok { color: var(--accent-ink); font-weight: 600; }

/* ============================================================
   FOOTER
   ============================================================ */

footer.foot {
  border-top: 1px solid var(--rule);
  padding: 36px 28px;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-muted);
}
.foot-inner { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 18px; }
.foot a { color: var(--ink-soft); text-decoration: none; }
.foot a:hover { color: var(--accent-ink); }

/* ============================================================
   Utility
   ============================================================ */
.flex { display: flex; }
.gap-2 { gap: 12px; }
.gap-3 { gap: 18px; }
.mt-2 { margin-top: 12px; }
.mt-3 { margin-top: 18px; }
.mt-4 { margin-top: 28px; }

@media (max-width: 900px) {
  .hero-grid, .dsl-grid { grid-template-columns: 1fr; gap: 32px; }
  .feat-grid { grid-template-columns: 1fr; }
  .feat { border-left: 0; border-top: 1px solid var(--rule); }
  .feat:first-child { border-top: 0; }
  .scrubber-meta { grid-template-columns: repeat(2, 1fr); }
  .corruption-controls { grid-template-columns: repeat(2, 1fr); }
  .compare { grid-template-columns: 1fr; }
  .compare-side + .compare-side { border-left: 0; border-top: 1px solid var(--rule); }
  .lesson-nav { grid-template-columns: 1fr; }
}

/* ============================================================
   Specimen opener — annotated museum-card hero
   ============================================================ */

.specimen-page {
  max-width: 1180px;
  padding: 28px 24px 88px;
  margin: 0 auto;
}

/* meta bar above the card */
.specimen-meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  padding: 0 4px 14px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 0;
}
.specimen-meta-l {
  display: flex; align-items: baseline; gap: 18px;
  flex-wrap: wrap;
}
.specimen-tag {
  font-family: var(--font-mono);
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
}
.specimen-tag span { color: var(--accent); font-weight: 600; }
.specimen-loc {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-muted);
}
.specimen-level {
  font-size: 12px;
  color: var(--archive);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.specimen-meta-r {
  display: flex; align-items: center; gap: 8px;
}
.specimen-btn {
  background: transparent;
  border: 1px solid var(--rule-strong);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  height: 26px; padding: 0 10px;
  border-radius: 3px;
  cursor: pointer;
  transition: all 120ms ease;
}
.specimen-btn:hover {
  border-color: var(--ink);
  color: var(--ink);
}
.specimen-btn-regen {
  letter-spacing: 0.04em;
}
.specimen-progress {
  display: inline-flex; align-items: center; gap: 6px;
  margin: 0 4px;
}
.sp-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: transparent;
  border: 1px solid var(--rule-strong);
  transition: all 200ms ease;
}
.sp-dot.is-active {
  background: var(--ink);
  border-color: var(--ink);
}
.sp-dot.is-passed {
  background: var(--ink-muted);
  border-color: var(--ink-muted);
}

/* the specimen card itself */
.specimen-card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  border-top: 0;
  padding: 0 36px;
  position: relative;
  overflow: visible;
  /* corner brackets — museum exhibit feel */
}
.specimen-card::before,
.specimen-card::after {
  content: '';
  position: absolute;
  width: 14px; height: 14px;
  border: 1px solid var(--ink);
  pointer-events: none;
}
.specimen-card::before {
  top: -1px; left: -1px;
  border-right: 0; border-bottom: 0;
}
.specimen-card::after {
  bottom: -1px; right: -1px;
  border-left: 0; border-top: 0;
}

/* ─── narration above the card ─── */
.specimen-narration {
  display: flex; align-items: baseline; gap: 14px;
  flex-wrap: wrap;
  padding: 0 4px 14px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 0;
}
.spec-headline {
  font-family: var(--font-serif);
  font-size: 22px; font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.01em;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 380ms ease, transform 380ms ease;
}
.spec-headline.is-shown { opacity: 1; transform: translateY(0); }
.spec-narrate {
  font-family: var(--font-serif);
  font-size: 14.5px;
  font-style: italic;
  color: var(--ink-soft);
  line-height: 1.45;
  flex: 1 1 360px;
  max-width: 720px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 380ms ease 80ms, transform 380ms ease 80ms;
}
.spec-narrate.is-shown { opacity: 1; transform: translateY(0); }

/* ─── callouts: slot layout, vertical hairline, inline bp pill ─── */
.callouts {
  position: relative;
  height: 128px;
}
.callouts-top { padding-top: 22px; }
.callouts-bot { padding-bottom: 20px; }

.callout {
  position: absolute;
  width: 168px;
  left: var(--slot-x);
  transform: translate(-50%, 4px);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  color: var(--ink);
  opacity: 0;
  transition: opacity 280ms ease, transform 280ms ease;
  text-align: left;
}
.callout.is-shown { opacity: 1; transform: translate(-50%, 0); }

.callout-k {
  display: block;
  color: var(--ink-muted);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 3px;
  font-weight: 500;
}
.callout-v {
  display: block;
  color: var(--ink);
  font-weight: 600;
  word-break: break-word;
}
.callout-v.is-truth  { color: var(--accent-ink); }
.callout-v.is-cobalt { color: var(--info-ink); }
.callout-v.is-plum   { color: var(--archive-ink); }
.callout-v.is-mut    { color: var(--data-cyan); }
.callout-v.is-warn   { color: var(--data-rust); }

/* anchor dot — sits AT the bp position on the ribbon, NOT at slot */
.callout::before {
  content: '';
  position: absolute;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--ink);
  z-index: 2;
}
/* the L-hairline: from card stem down/up to the ribbon, then across to the dot.
   We draw it with two background gradients so a single ::after suffices. */
.callout::after {
  content: '';
  position: absolute;
  pointer-events: none;
  z-index: 1;
}

/* TOP band: card on top, dot on the ribbon below.
   The hairline runs: vertical down from card center → horizontal at bend → vertical down to dot.
   Implemented as a 1px-tall horizontal track + a 1px-wide vertical pole at slot-x. */
.callouts-top .callout {
  top: 22px;
}
.callouts-top .callout::before {
  /* dot sits at the ribbon level (bottom of band) */
  bottom: -100px;
  left: calc(var(--anchor-x) - var(--slot-x) + 50%);
  transform: translate(-50%, 50%);
}
.callouts-top .callout::after {
  /* vertical line from below card to ribbon at slot-x */
  left: 50%;
  top: 60px;
  width: 1px;
  height: 36px;
  background: var(--rule-strong);
  transform: translateX(-50%);
}
/* horizontal jog from slot-x to anchor-x at the bend point.
   Drawn as a separate element via the callout itself acting as the L's corner. */
.callouts-top .callout .callout-jog,
.callouts-bot .callout .callout-jog {
  position: absolute;
  height: 1px;
  background: var(--rule-strong);
  pointer-events: none;
  z-index: 1;
}
.callouts-top .callout .callout-jog {
  top: 96px;
}
.callouts-top .callout .callout-stub {
  position: absolute;
  width: 1px;
  height: 14px;
  background: var(--rule-strong);
  top: 96px;
  left: calc(var(--anchor-x) - var(--slot-x) + 50%);
  transform: translateX(-50%);
}

/* BOT band: card at bottom, dot at top of band (= ribbon). */
.callouts-bot .callout {
  bottom: 0;
  top: auto;
}
.callouts-bot .callout::before {
  top: -86px;
  left: calc(var(--anchor-x) - var(--slot-x) + 50%);
  transform: translate(-50%, -50%);
}
.callouts-bot .callout::after {
  /* vertical line from above card up to bend at slot-x */
  left: 50%;
  bottom: 56px;
  width: 1px;
  height: 24px;
  background: var(--rule-strong);
  transform: translateX(-50%);
}
.callouts-bot .callout .callout-jog {
  bottom: 78px;
}
.callouts-bot .callout .callout-stub {
  position: absolute;
  width: 1px;
  height: 12px;
  background: var(--rule-strong);
  bottom: 78px;
  left: calc(var(--anchor-x) - var(--slot-x) + 50%);
  transform: translateX(-50%);
}

/* drift line: dashed connector between two top-band callouts to dramatize
   "truth says X, aligner says Y". Sits inside the card, above the ribbon. */
.drift-line {
  position: absolute;
  top: 96px;             /* aligned with the bend row */
  left: var(--from-x);
  width: calc(var(--to-x) - var(--from-x));
  height: 22px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 360ms ease;
  z-index: 0;
}
.drift-line.is-shown { opacity: 1; }
.drift-line::before {
  content: '';
  position: absolute;
  top: 50%; left: 0; right: 0;
  border-top: 1.5px dashed var(--data-rust);
  transform: translateY(-50%);
}
.drift-line::after {
  content: 'aligner drift';
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg-card);
  padding: 1px 8px;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--data-rust);
  font-weight: 600;
}

/* the ribbon stage — the specimen itself */
.specimen-stage {
  position: relative;
  padding: 6px 0;
}

.ribbon-ruler {
  position: relative;
  height: 18px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 8px;
}
.ribbon-ruler .tick {
  position: absolute;
  bottom: 0;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-muted);
  padding-bottom: 4px;
}
.ribbon-ruler .tick::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 1px; height: 4px;
  background: var(--rule-strong);
}

.ribbon {
  position: relative;
  height: 56px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 3px;
  overflow: hidden;
}
.ribbon-region {
  position: absolute;
  top: 0; bottom: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: #fff;
  transition: left 600ms cubic-bezier(.6,0,.2,1),
              width 600ms cubic-bezier(.6,0,.2,1),
              opacity 300ms ease,
              background 280ms ease;
}
.ribbon-region.is-v   { background: var(--seg-v); }
.ribbon-region.is-d   { background: var(--seg-d); }
.ribbon-region.is-j   { background: var(--seg-j); }
.ribbon-region.is-np1,
.ribbon-region.is-np2 { background: var(--seg-np); color: #fff; }
.ribbon-region.is-lost {
  background: repeating-linear-gradient(
    45deg, #c8c8c0 0 4px, #e4e4dd 4px 8px
  );
  color: var(--ink-muted);
  font-size: 9px;
}

/* mutation marks — small dots layered above the ribbon */
.ribbon-mut {
  position: absolute;
  top: 50%; transform: translate(-50%, -50%);
  width: 4px; height: 18px;
  background: var(--data-cyan);
  border-radius: 2px;
  z-index: 3;
  box-shadow: 0 0 0 1.5px rgba(255,255,255,0.6);
  animation: mut-pulse 1800ms ease-in-out infinite;
}
@keyframes mut-pulse {
  0%, 100% { opacity: 0.85; }
  50% { opacity: 1; transform: translate(-50%, -50%) scaleY(1.15); }
}

/* N-base marks */
.ribbon-n {
  position: absolute;
  top: 0; bottom: 0;
  width: 3px;
  background: rgba(255,255,255,0.85);
  z-index: 3;
}

/* scanning line — subtle, indicates "live" */
.ribbon-scan {
  position: absolute;
  top: 0; bottom: 0; width: 2px;
  background: linear-gradient(180deg, transparent, var(--accent) 50%, transparent);
  opacity: 0.55;
  z-index: 4;
  pointer-events: none;
  animation: scan-sweep 4400ms cubic-bezier(.65,0,.35,1) infinite;
}
@keyframes scan-sweep {
  0%   { left: -2%;  opacity: 0; }
  10%  { opacity: 0.55; }
  90%  { opacity: 0.55; }
  100% { left: 102%; opacity: 0; }
}

/* base-letter strip (dim, mono) */
.ribbon-bases {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  color: var(--ink-muted);
  margin-top: 6px;
  height: 14px;
  white-space: nowrap;
  overflow: hidden;
  position: relative;
}
.ribbon-bases .b {
  display: inline-block;
}
.ribbon-bases .b-mut { color: var(--data-cyan); font-weight: 600; }
.ribbon-bases .b-n   { color: var(--data-rust); }

/* caption / footer */
.specimen-caption {
  margin-top: 32px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: center;
  padding: 0 4px;
}
.specimen-caption p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 680px;
}
.specimen-caption code {
  font-family: var(--font-mono);
  font-size: 14px;
  background: var(--bg-soft);
  padding: 1px 5px;
  border-radius: 3px;
  color: var(--ink);
}
.specimen-caption em {
  font-style: italic;
  color: var(--ink);
  background: linear-gradient(transparent 65%, var(--accent-soft) 65%);
  padding: 0 2px;
}
.specimen-cta {
  display: flex; flex-direction: column; gap: 8px;
  flex-shrink: 0;
}

@media (max-width: 880px) {
  .specimen-page { padding: 18px 14px 60px; }
  .specimen-card { padding: 0 18px; }
  .callout { width: 140px; font-size: 10px; }
  .specimen-caption { grid-template-columns: 1fr; }
  .specimen-cta { flex-direction: row; flex-wrap: wrap; }
  .specimen-meta { flex-direction: column; align-items: flex-start; gap: 10px; }
}


/* engine strip — small inline summary below WHY cards */
.engine-strip {
  margin-top: 32px;
  display: flex; flex-wrap: wrap; align-items: center; gap: 18px;
  padding: 16px 22px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}
.engine-strip b { color: var(--ink); font-weight: 600; }
.engine-strip .engine-tag {
  font-size: 10px; letter-spacing: 0.18em;
  font-weight: 600; color: var(--accent-ink);
  padding-right: 14px; border-right: 1px solid var(--rule-strong);
}
.engine-strip .sep {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--rule-strong);
}
@media (max-width: 720px) {
  .engine-strip { font-size: 11px; gap: 10px; }
  .engine-strip .sep { display: none; }
}


/* ============================================================
   Concepts hub + chapter pages
   ============================================================ */

.concepts-hero { padding: 64px 28px 48px; max-width: 1100px; }
.concepts-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(40px, 5.4vw, 64px);
  line-height: 1.04; letter-spacing: -0.02em;
  font-weight: 500; margin: 16px 0 24px; color: var(--ink);
}
.concepts-hero .lead {
  font-family: var(--font-serif);
  font-size: 19px; line-height: 1.55; color: var(--ink-soft);
  max-width: 64ch; margin: 0 0 14px;
}
.concepts-hero .lead em { font-style: italic; color: var(--ink); }
.concepts-hero .lead-sub {
  font-size: 14.5px; color: var(--ink-muted); max-width: 60ch;
  line-height: 1.6;
}

/* breadcrumbs */
.crumbs {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 11px;
  color: var(--ink-muted); margin-bottom: 24px;
  text-transform: uppercase; letter-spacing: 0.08em;
}
.crumbs a { color: var(--ink-muted); text-decoration: none; }
.crumbs a:hover { color: var(--ink); }
.crumbs-sep { color: var(--rule-strong); }
.crumbs-cur { color: var(--ink); }

/* concept grid */
.concept-grid-wrap { padding: 0 28px 80px; max-width: 1200px; }
.concept-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule-strong);
  border-left: 1px solid var(--rule-strong);
}
.concept-card {
  position: relative;
  display: flex; flex-direction: column;
  padding: 36px 36px 32px;
  background: var(--bg-card);
  border-right: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  text-decoration: none; color: inherit;
  transition: background 200ms ease;
}
.concept-card:hover { background: var(--bg-soft); }
.concept-card:hover .concept-go {
  color: var(--accent-ink);
  transform: translateX(4px);
}

.concept-num {
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.18em;
  font-weight: 600; color: var(--archive-ink);
  margin-bottom: 6px;
}
.concept-meta {
  display: flex; gap: 14px; align-items: center;
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 18px;
}
.concept-tag {
  color: var(--info-ink);
  font-weight: 600;
}
.concept-time::before { content: "· "; color: var(--rule-strong); margin-right: 6px; }

.concept-card h2 {
  font-family: var(--font-serif);
  font-size: 26px; line-height: 1.15;
  font-weight: 500; letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 14px;
}
.concept-card p {
  font-family: var(--font-serif);
  font-size: 15px; line-height: 1.6;
  color: var(--ink-soft);
  margin: 0 0 26px;
}
.concept-card p code,
.concept-card p b {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--ink);
  font-weight: 600;
}
.concept-card p em {
  font-style: italic;
  color: var(--ink);
}

.concept-go {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  transition: color 160ms ease, transform 200ms ease;
}

/* ─── diagram: pipeline ─── */
.concept-diagram {
  margin: 0 0 28px;
  padding: 22px 8px 16px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 2px;
}

.diagram-pipeline {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0;
  padding: 26px 20px 22px;
}
.dp-track {
  position: absolute;
  left: 16%; right: 16%;
  top: 36px;
  height: 1px;
  background: var(--rule-strong);
}
.dp-node {
  position: relative;
  text-align: center;
  padding-top: 22px;
  font-family: var(--font-mono);
  font-size: 10px;
}
.dp-node::before {
  content: '';
  position: absolute;
  top: 9px; left: 50%;
  transform: translateX(-50%);
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--ink);
  z-index: 1;
}
.dp-node-1::before { border-color: var(--accent); }
.dp-node-2::before { border-color: var(--info); }
.dp-node-3::before { border-color: var(--archive); }

.dp-label {
  display: block;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}
.dp-passes {
  display: block;
  font-size: 9.5px;
  color: var(--ink-muted);
  line-height: 1.4;
  letter-spacing: 0;
  text-transform: none;
}

/* ─── diagram: IR layers ─── */
.diagram-ir { padding: 18px 22px 14px; }
.dir-stack {
  display: flex; flex-direction: column-reverse;
  gap: 0;
}
.dir-layer {
  display: flex; align-items: center;
  padding: 7px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  border-left: 2px solid var(--rule-strong);
  background: var(--bg-card);
  margin-left: 0;
  position: relative;
  border-bottom: 1px solid var(--rule);
}
.dir-layer:last-child { border-bottom: 1px solid var(--rule-strong); }
.dir-layer-1 { border-left-color: var(--accent); }
.dir-layer-2 { border-left-color: var(--info); }
.dir-layer-3 { border-left-color: var(--data-rust); }
.dir-tag {
  width: 56px; flex-shrink: 0;
  font-size: 9.5px; color: var(--ink-muted);
  letter-spacing: 0.06em;
}
.dir-payload {
  color: var(--ink); font-weight: 500;
}
.dir-arrow {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-muted);
  margin-top: 8px;
  text-align: center;
}
.dir-arrow code {
  background: var(--bg-soft); padding: 1px 5px;
  border-radius: 2px; font-size: 10px;
}

/* ─── diagram: contracts (also reused by live-call) ─── */
.diagram-contracts,
.diagram-livecall { padding: 14px 18px 14px; }
.dc-list { list-style: none; padding: 0; margin: 0; }
.dc-row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  column-gap: 14px;
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11px;
}
.dc-row:last-child { border-bottom: 0; }
.dc-name {
  grid-column: 1; grid-row: 1;
  color: var(--ink); font-weight: 600;
}
.dc-detail {
  grid-column: 1; grid-row: 2;
  color: var(--ink-muted); font-size: 9.5px;
}
.dc-mark {
  grid-column: 2; grid-row: 1 / span 2;
  align-self: center;
  font-family: var(--font-mono);
  font-size: 14px; color: var(--accent-ink);
  font-weight: 700;
}
.dc-foot {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--ink-muted);
  text-align: right;
}
.dc-foot code {
  color: var(--accent-ink); font-weight: 600;
  background: transparent;
}

/* ─── diagram: AIRR record ─── */
.diagram-record { padding: 12px 16px; }
.dr-table {
  width: 100%; border-collapse: collapse;
  font-family: var(--font-mono); font-size: 10.5px;
}
.dr-table td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--rule);
}
.dr-table tr:last-child td { border-bottom: 0; }
.dr-k { color: var(--ink); font-weight: 500; }
.dr-v { color: var(--info-ink); width: 40px; }
.dr-note { color: var(--ink-muted); font-size: 9.5px; text-align: right; }
.dr-truth .dr-k { color: var(--accent-ink); font-weight: 600; }
.dr-rest .dr-k {
  color: var(--ink-muted);
  text-align: center;
  font-style: italic;
  padding: 8px 0;
}

/* concept further */
.concept-further { padding: 64px 28px 96px; max-width: 1100px; }
.cf-rule { height: 1px; background: var(--rule-strong); margin-bottom: 48px; }
.cf-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 60px;
}
.cf-col h3 {
  font-family: var(--font-serif);
  font-size: 28px; font-weight: 500;
  margin: 12px 0 14px; line-height: 1.2;
  letter-spacing: -0.01em;
}
.cf-col p {
  font-family: var(--font-serif);
  font-size: 15px; line-height: 1.6;
  color: var(--ink-soft);
  margin: 0 0 22px; max-width: 44ch;
}

@media (max-width: 880px) {
  .concept-grid { grid-template-columns: 1fr; }
  .cf-grid { grid-template-columns: 1fr; gap: 40px; }
  .concepts-hero { padding: 40px 20px 32px; }
}


/* ============================================================
   Concept chapter pages — pipeline deep-dive
   ============================================================ */

.chapter-hero { padding: 64px 28px 36px; max-width: 1000px; }
.chapter-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(40px, 5.4vw, 64px);
  line-height: 1.04; letter-spacing: -0.02em;
  font-weight: 500; margin: 16px 0 24px;
}
.chapter-hero .lead {
  font-family: var(--font-serif);
  font-size: 19px; line-height: 1.55;
  color: var(--ink-soft);
  max-width: 64ch;
}
.chapter-hero .lead em { font-style: italic; color: var(--ink); }
.chapter-hero .lead b {
  font-family: var(--font-mono);
  font-size: 16px; font-weight: 600; color: var(--ink);
}

/* ── timeline rail ── */
.chapter-timeline {
  padding: 40px 28px 56px;
  max-width: 1100px;
  border-bottom: 1px solid var(--rule-strong);
}
.ctl-rail {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
}
.ctl-track {
  position: absolute;
  left: 14%; right: 14%;
  top: 13px;
  height: 1px;
  background: var(--ink);
}
.ctl-stop {
  position: relative;
  text-align: center;
  padding-top: 36px;
}
.ctl-dot {
  position: absolute;
  top: 4px; left: 50%;
  transform: translateX(-50%);
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--ink);
  z-index: 1;
}
.ctl-stop-1 .ctl-dot { border-color: var(--accent); }
.ctl-stop-2 .ctl-dot { border-color: var(--info); }
.ctl-stop-3 .ctl-dot { border-color: var(--archive); }

.ctl-num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  font-weight: 600;
  color: var(--ink-muted);
}
.ctl-name {
  display: block;
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 4px 0 6px;
}
.ctl-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--ink-muted);
  line-height: 1.4;
}

/* ── phase section ── */
.chapter-phase {
  max-width: 1100px;
  padding: 64px 28px 56px;
  border-bottom: 1px solid var(--rule);
  display: block;
}
.chapter-phase:last-of-type { border-bottom: 1px solid var(--rule-strong); }

.ph-head { max-width: 760px; margin-bottom: 36px; }
.ph-num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  font-weight: 600;
  color: var(--archive-ink);
}
.chapter-phase-1 .ph-num { color: var(--accent-ink); }
.chapter-phase-2 .ph-num { color: var(--info-ink); }
.chapter-phase-3 .ph-num { color: var(--data-rust); }

.ph-head h2 {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 10px 0 16px;
  color: var(--ink);
}
.ph-lead {
  font-family: var(--font-serif);
  font-size: 16px; line-height: 1.6;
  color: var(--ink-soft);
  max-width: 60ch;
}
.ph-lead em { font-style: italic; color: var(--ink); }

/* ── grid of two cards: passes + dsl call ── */
.ph-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 0;
  margin-bottom: 32px;
  border: 1px solid var(--rule-strong);
  background: var(--bg-card);
}
.ph-card { padding: 22px 24px; border-right: 1px solid var(--rule-strong); }
.ph-card:last-child { border-right: 0; }
.ph-card-head {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 600;
  margin-bottom: 14px;
}
.pass-list { list-style: none; padding: 0; margin: 0; }
.pass-list li {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.5;
}
.pass-list li:last-child { border-bottom: 0; }
.pass-name { color: var(--ink); font-weight: 600; }
.pass-note { color: var(--ink-muted); font-size: 10.5px; }

.ph-card-code .code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink);
  white-space: pre;
  overflow-x: auto;
}
.ph-card-code .c-c { color: var(--ink-muted); }
.ph-card-code .c-s { color: var(--accent-ink); }
.ph-card-code .c-n { color: var(--info-ink); }
.ph-card-code .c-k { color: var(--archive-ink); font-weight: 600; }
.ph-card-code .c-fn { color: var(--data-cyan); }
.ph-card-code .c-cl { color: var(--data-cyan); font-weight: 600; }

/* ── before / after ribbons ── */
.ph-ribbons {
  display: grid;
  grid-template-columns: 1fr 32px 1fr;
  gap: 18px;
  align-items: center;
  margin-bottom: 32px;
}
.ph-ribbon { }
.phr-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-bottom: 8px;
}
.phr-track {
  position: relative;
  display: flex;
  height: 36px;
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  overflow: hidden;
}
.phr-empty {
  align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 11px; color: var(--ink-muted);
  font-style: italic;
}
.phr-seg {
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 10px; font-weight: 600;
  color: #fff;
  letter-spacing: 0.08em;
}
.phr-seg.phr-v   { background: var(--seg-v); }
.phr-seg.phr-d   { background: var(--seg-d); }
.phr-seg.phr-j   { background: var(--seg-j); }
.phr-seg.phr-np  { background: var(--seg-np); }
.phr-seg.phr-lost {
  color: var(--ink-muted); font-size: 9px;
  background: repeating-linear-gradient(45deg,
    #c8c8c0 0 4px, #e4e4dd 4px 8px);
}
.phr-mut {
  position: absolute;
  top: 2px; bottom: 2px;
  width: 2px;
  background: var(--data-cyan);
  transform: translateX(-50%);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.7);
}
.phr-n {
  position: absolute;
  top: 0; bottom: 0;
  width: 6px;
  background: rgba(214,99,71,0.35);
  border-left: 1px solid var(--data-rust);
  border-right: 1px solid var(--data-rust);
  transform: translateX(-50%);
}
.ph-arrow {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--ink-muted);
  font-weight: 300;
}

/* ── recorded fields ── */
.ph-recorded {
  background: var(--bg-soft);
  border: 1px solid var(--rule);
  padding: 18px 22px 22px;
}
.phr-head {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-ink);
  font-weight: 600;
  margin-bottom: 14px;
}
.phr-fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 6px 22px;
}
.phr-field {
  display: flex; gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 4px 0;
  border-bottom: 1px dotted var(--rule);
}
.phr-k {
  flex: 0 0 160px;
  color: var(--ink); font-weight: 500;
}
.phr-v {
  color: var(--accent-ink);
  font-weight: 600;
  text-align: right;
  flex: 1;
}
.phr-more {
  font-style: italic;
  color: var(--ink-muted);
  font-size: 10.5px;
  border-bottom: 0;
}

/* ── invariants section ── */
.invariants { max-width: 1100px; padding: 64px 28px 56px; }
.inv-rule { height: 1px; background: var(--rule-strong); margin-bottom: 48px; }
.inv-grid {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 60px; align-items: start;
}
.inv-head h2 {
  font-family: var(--font-serif);
  font-size: 36px; font-weight: 500;
  letter-spacing: -0.015em; line-height: 1.1;
  margin: 10px 0 16px;
}
.inv-head p {
  font-family: var(--font-serif);
  font-size: 15px; line-height: 1.6;
  color: var(--ink-soft);
  max-width: 44ch;
}
.inv-head p em { font-style: italic; color: var(--ink); }
.inv-head p b, .inv-head p code {
  font-family: var(--font-mono);
  font-size: 13.5px; font-weight: 600;
  color: var(--ink);
}
.inv-list { display: grid; gap: 0; }
.inv-item {
  padding: 18px 0;
  border-top: 1px solid var(--rule-strong);
}
.inv-item:last-child { border-bottom: 1px solid var(--rule-strong); }
.inv-name {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-ink);
  margin-bottom: 6px;
}
.inv-detail {
  font-family: var(--font-serif);
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.inv-detail code {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink);
}

/* ── custom pass section ── */
.custom-pass { max-width: 1100px; padding: 64px 28px 56px; }
.cp-rule { height: 1px; background: var(--rule-strong); margin-bottom: 48px; }
.cp-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  gap: 48px;
  align-items: start;
}
.cp-text h2 {
  font-family: var(--font-serif);
  font-size: 32px; font-weight: 500;
  letter-spacing: -0.015em; line-height: 1.12;
  margin: 12px 0 16px;
}
.cp-text p {
  font-family: var(--font-serif);
  font-size: 15px; line-height: 1.6;
  color: var(--ink-soft);
  margin-bottom: 22px; max-width: 46ch;
}
.cp-text code {
  font-family: var(--font-mono);
  font-size: 13px; color: var(--ink);
  font-weight: 600;
}
.cp-code {
  background: var(--bg-card);
  border: 1px solid var(--rule-strong);
  padding: 22px 24px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.55;
}
.cp-code pre { margin: 0; white-space: pre; overflow-x: auto; }
.cp-code .c-c { color: var(--ink-muted); }
.cp-code .c-s { color: var(--accent-ink); }
.cp-code .c-n { color: var(--info-ink); }
.cp-code .c-k { color: var(--archive-ink); font-weight: 600; }
.cp-code .c-fn { color: var(--data-cyan); }
.cp-code .c-cl { color: var(--data-cyan); font-weight: 600; }

/* ── next chapter ── */
.chapter-next { max-width: 1100px; padding: 56px 28px 96px; }
.cn-rule { height: 1px; background: var(--rule-strong); margin-bottom: 48px; }
.cn-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 48px;
}
.cn-item h3 {
  font-family: var(--font-serif);
  font-size: 26px; font-weight: 500;
  letter-spacing: -0.01em; line-height: 1.15;
  margin: 12px 0 14px;
}
.cn-item p {
  font-family: var(--font-serif);
  font-size: 14.5px; line-height: 1.55;
  color: var(--ink-soft);
  margin: 0 0 20px; max-width: 42ch;
}

@media (max-width: 880px) {
  .ph-grid { grid-template-columns: 1fr; }
  .ph-card { border-right: 0; border-bottom: 1px solid var(--rule-strong); }
  .ph-card:last-child { border-bottom: 0; }
  .ph-ribbons { grid-template-columns: 1fr; }
  .ph-arrow { transform: rotate(90deg); }
  .inv-grid, .cp-grid, .cn-grid { grid-template-columns: 1fr; gap: 36px; }
  .ctl-rail { grid-template-columns: 1fr; gap: 24px; }
  .ctl-track { display: none; }
  .pass-list li { grid-template-columns: 1fr; gap: 2px; }
}


/* ============================================================
   Guides hub
   ============================================================ */

.guides-hero { padding: 64px 28px 36px; max-width: 1100px; }
.gh-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 48px; align-items: end;
  margin-top: 16px;
}
.guides-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(40px, 5.4vw, 64px);
  line-height: 1.04; letter-spacing: -0.02em;
  font-weight: 500; margin: 14px 0 22px;
}
.guides-hero .lead {
  font-family: var(--font-serif);
  font-size: 18px; line-height: 1.55;
  color: var(--ink-soft); max-width: 56ch;
}
.gh-aside {
  border-left: 1px solid var(--rule-strong);
  padding-left: 28px;
  display: grid; gap: 18px;
}
.gh-aside-row { display: grid; gap: 6px; }
.gh-aside-k {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--archive-ink); font-weight: 600;
}
.gh-aside-v {
  font-family: var(--font-serif);
  font-size: 14px; line-height: 1.5;
  color: var(--ink-soft);
}
.gh-aside-v em { font-style: italic; color: var(--ink); }

/* ── filter bar ── */
.guides-filter {
  max-width: 1100px;
  padding: 24px 28px;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  background: var(--bg-soft);
}
.gf-bar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.gf-group { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.gf-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 600;
  margin-right: 6px;
}
.gf-chip {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  padding: 6px 12px;
  background: var(--bg);
  border: 1px solid var(--rule-strong);
  color: var(--ink-soft);
  cursor: pointer;
  letter-spacing: 0.02em;
}
.gf-chip:hover { background: var(--bg-card); color: var(--ink); }
.gf-chip-on { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.gf-chip-on:hover { background: var(--ink); color: var(--bg); }
.gf-chip-n {
  display: inline-block;
  margin-left: 4px;
  font-size: 10px;
  opacity: 0.65;
}

.gf-search {
  display: flex; align-items: center; gap: 8px;
  background: var(--bg);
  border: 1px solid var(--rule-strong);
  padding: 4px 10px 4px 12px;
  min-width: 280px;
}
.gf-search-icon { color: var(--ink-muted); font-size: 14px; }
.gf-search-input {
  border: 0; outline: 0; background: transparent;
  font-family: var(--font-mono);
  font-size: 12px; color: var(--ink);
  padding: 6px 0; flex: 1; min-width: 0;
}
.gf-search-input::placeholder { color: var(--ink-muted); }
.gf-search-key {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-muted);
  border: 1px solid var(--rule-strong);
  padding: 2px 6px;
  letter-spacing: 0.04em;
}

/* ── guide group ── */
.guide-group {
  max-width: 1100px;
  padding: 56px 28px 32px;
  border-bottom: 1px solid var(--rule);
}
.guide-group:last-of-type { border-bottom: 1px solid var(--rule-strong); }

.gg-head {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 24px;
  align-items: baseline;
  margin-bottom: 28px;
}
.gg-ord {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 56px;
  font-weight: 400;
  line-height: 1;
  color: var(--archive-ink);
}
.gg-head h2 {
  font-family: var(--font-serif);
  font-size: 36px; font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.05;
  margin: 0 0 8px;
}
.gg-head p {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 60ch;
  margin: 0;
}

/* ── guide card (row form) ── */
.gg-list {
  display: grid;
  border-top: 1px solid var(--rule-strong);
}
.gc {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr) 28px;
  gap: 24px;
  align-items: start;
  padding: 22px 8px 22px 4px;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
}
.gc:last-child { border-bottom: 0; }
.gc:hover { background: var(--bg-soft); }

.gc-num {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  padding-top: 4px;
}
.gc-body { min-width: 0; }
.gc-body h3 {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 8px;
  color: var(--ink);
}
.gc-body p {
  font-family: var(--font-serif);
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-soft);
  margin: 0 0 12px;
  max-width: 64ch;
}
.gc-body p code, .gc-body p em {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-style: normal;
  color: var(--ink);
  font-weight: 600;
}
.gc-body p em { font-family: var(--font-serif); font-style: italic; font-size: 14.5px; font-weight: 400; color: var(--ink); }

.gc-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--ink-muted);
  flex-wrap: wrap;
}
.gc-dot { opacity: 0.5; }
.gc-time { font-weight: 500; }
.gc-diff { letter-spacing: 0.04em; }
.gc-tags { display: inline-flex; gap: 6px; margin-left: 6px; }
.gc-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--bg-card);
  border: 1px solid var(--rule);
  color: var(--ink-soft);
  padding: 2px 6px;
  letter-spacing: 0.04em;
}

.gc-arrow {
  align-self: center;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--ink-muted);
  text-align: right;
  transition: transform 0.2s, color 0.2s;
}
.gc:hover .gc-arrow { transform: translateX(3px); color: var(--accent-ink); }

/* ── missing ── */
.guides-missing { max-width: 1100px; padding: 64px 28px 96px; }
.gm-rule { height: 1px; background: var(--rule-strong); margin-bottom: 48px; }
.gm-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 48px; align-items: end;
}
.gm-grid h2 {
  font-family: var(--font-serif);
  font-size: 32px; font-weight: 500;
  letter-spacing: -0.015em; line-height: 1.1;
  margin: 10px 0 16px;
}
.gm-grid p {
  font-family: var(--font-serif);
  font-size: 15px; line-height: 1.6;
  color: var(--ink-soft);
  max-width: 50ch;
}
.gm-actions { display: grid; gap: 12px; justify-items: start; }

@media (max-width: 880px) {
  .gh-grid { grid-template-columns: 1fr; gap: 28px; }
  .gh-aside { border-left: 0; padding-left: 0; border-top: 1px solid var(--rule-strong); padding-top: 24px; }
  .gc { grid-template-columns: 56px minmax(0, 1fr); }
  .gc-arrow { display: none; }
  .gg-head { grid-template-columns: 1fr; gap: 8px; }
  .gg-ord { font-size: 40px; }
  .gm-grid { grid-template-columns: 1fr; }
  .gf-search { width: 100%; min-width: 0; }
}


/* ============================================================
   Footer (concepts/guides/deep-dive pages)
   ============================================================ */
.footer {
  border-top: 1px solid var(--rule-strong);
  padding: 48px 28px 64px;
  margin-top: 64px;
  background: var(--bg-soft);
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: 48px;
  align-items: start;
}
.footer .brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}
.footer-tag {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 14px;
  color: var(--ink-muted);
  margin: 10px 0 0;
  max-width: 30ch;
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.footer-cols h4 {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 600;
  margin: 0 0 12px;
}
.footer-cols a {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 4px 0;
  transition: color 0.15s;
}
.footer-cols a:hover { color: var(--accent-ink); }

@media (max-width: 720px) {
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
}


/* ============================================================
   Reference hub
   ============================================================ */

.ref-hero { padding: 64px 28px 36px; max-width: 1100px; }
.rh-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: 48px; align-items: end;
  margin-top: 16px;
}
.ref-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(40px, 5.4vw, 64px);
  line-height: 1.04; letter-spacing: -0.02em;
  font-weight: 500; margin: 14px 0 22px;
}
.ref-hero .lead {
  font-family: var(--font-serif);
  font-size: 18px; line-height: 1.55;
  color: var(--ink-soft); max-width: 56ch;
}
.rh-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--rule-strong);
  background: var(--bg-card);
}
.rh-stat {
  padding: 18px 20px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.rh-stat:nth-child(2n) { border-right: 0; }
.rh-stat:nth-child(n+3) { border-bottom: 0; }
.rh-stat-n {
  display: block;
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.rh-stat-l {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
  margin-top: 4px;
}

/* ── tabs ── */
.ref-tabs {
  max-width: 1100px;
  padding: 0 28px;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  background: var(--bg-soft);
  position: sticky;
  top: 0;
  z-index: 10;
}
.rt-bar {
  display: flex;
  align-items: stretch;
  gap: 0;
  flex-wrap: wrap;
}
.rt-tab {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 18px;
  text-decoration: none;
  color: var(--ink-soft);
  border-right: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}
.rt-tab:hover { background: var(--bg); color: var(--ink); }
.rt-tab-on { color: var(--ink); background: var(--bg); border-bottom: 2px solid var(--accent-ink); }
.rt-tab-icon { color: var(--ink-muted); font-size: 13px; }
.rt-tab-n {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-muted);
  background: var(--bg-card);
  padding: 1px 6px;
  border: 1px solid var(--rule);
}
.rt-search {
  margin-left: auto;
  display: flex; align-items: center; gap: 8px;
  padding: 4px 10px;
  background: var(--bg);
  border-left: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  min-width: 320px;
}
.rt-search-icon { color: var(--ink-muted); font-size: 13px; }
.rt-search-input {
  border: 0; outline: 0; background: transparent;
  font-family: var(--font-mono);
  font-size: 12px; color: var(--ink);
  padding: 6px 0; flex: 1; min-width: 0;
}
.rt-search-input::placeholder { color: var(--ink-muted); }
.rt-search-key {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ink-muted);
  border: 1px solid var(--rule);
  padding: 1px 6px;
}

/* ── section ── */
.ref-section {
  max-width: 1100px;
  padding: 56px 28px 32px;
  border-bottom: 1px solid var(--rule-strong);
  scroll-margin-top: 60px;
}
.rs-head {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 24px;
  align-items: baseline;
  margin-bottom: 32px;
}
.rs-ord {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--ink-muted);
  border-top: 1px solid var(--ink);
  padding-top: 8px;
}
.rs-head h2 {
  font-family: var(--font-serif);
  font-size: 36px; font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.05;
  margin: 0 0 8px;
}
.rs-head p {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 64ch;
  margin: 0;
}
.rs-head code {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

/* ── api group ── */
.rs-group {
  margin-bottom: 36px;
  border: 1px solid var(--rule-strong);
  background: var(--bg-card);
}
.rs-group-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 1px solid var(--rule-strong);
  background: var(--bg-soft);
}
.rs-mod {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-ink);
}
.rs-group-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
  border: 1px solid var(--rule);
  padding: 2px 8px;
}
.rs-rows { display: grid; }
.rsr {
  display: grid;
  grid-template-columns: 56px minmax(0, 2fr) minmax(0, 3fr);
  gap: 16px;
  align-items: baseline;
  padding: 12px 18px;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
}
.rsr:last-child { border-bottom: 0; }
.rsr:hover { background: var(--bg-soft); }
.rsr-kind {
  font-family: var(--font-mono);
  font-size: 9.5px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 600;
  padding: 2px 6px;
  border: 1px solid var(--rule);
  text-align: center;
  align-self: center;
}
.rsr-kind-cls { color: var(--data-cyan); border-color: var(--data-cyan); }
.rsr-kind-fn { color: var(--accent-ink); border-color: var(--accent-ink); }
.rsr-kind-trait { color: var(--archive-ink); border-color: var(--archive-ink); }
.rsr-kind-more { color: var(--ink-muted); border-color: var(--rule-strong); }
.rsr-sig {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink);
  line-height: 1.5;
  word-break: break-word;
}
.rsr-sig b { font-weight: 600; color: var(--ink); }
.rsr-sig i { font-style: normal; color: var(--info-ink); }
.rsr-desc {
  font-family: var(--font-serif);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--ink-soft);
}
.rsr-desc code {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink);
  font-weight: 600;
}
.rsr-more .rsr-sig b { color: var(--accent-ink); }

/* ── configs grid ── */
.rs-cfg-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: var(--rule-strong);
  border: 1px solid var(--rule-strong);
}
.rs-cfg-col {
  background: var(--bg-card);
  padding: 16px 18px;
  display: grid;
  gap: 4px;
}
.rs-cfg-fam {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 600;
  color: var(--archive-ink);
  margin-bottom: 8px;
}
.rs-cfg {
  display: grid; gap: 2px;
  padding: 6px 0;
  border-bottom: 1px dotted var(--rule);
  text-decoration: none;
}
.rs-cfg:last-child { border-bottom: 0; }
.rs-cfg b {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink);
}
.rs-cfg span {
  font-family: var(--font-serif);
  font-size: 12.5px;
  color: var(--ink-muted);
  font-style: italic;
  line-height: 1.4;
}
.rs-cfg:hover b { color: var(--accent-ink); }

/* ── airr table ── */
.rs-field-toolbar {
  display: flex; gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
}
.rs-pill {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  padding: 3px 9px;
  border: 1px solid var(--rule-strong);
  letter-spacing: 0.04em;
}
.rs-pill-truth { color: var(--accent-ink); background: rgba(196,89,32,0.08); border-color: rgba(196,89,32,0.4); }
.rs-pill-evid  { color: var(--info-ink); background: rgba(58,121,168,0.08); border-color: rgba(58,121,168,0.4); }
.rs-pill-seg   { color: var(--data-cyan); background: rgba(43,127,141,0.08); border-color: rgba(43,127,141,0.4); }
.rs-pill-corr  { color: var(--data-rust); background: rgba(192,89,53,0.08); border-color: rgba(192,89,53,0.4); }
.rs-pill-meta  { color: var(--ink-muted); background: var(--bg-card); }
.rs-field-info {
  margin-left: auto;
  font-family: var(--font-serif);
  font-size: 13px;
  font-style: italic;
  color: var(--ink-muted);
}
.rs-field-info a { color: var(--accent-ink); }

.rs-table {
  border: 1px solid var(--rule-strong);
  background: var(--bg-card);
  font-family: var(--font-mono);
  font-size: 12px;
}
.rs-thead, .rs-trow {
  display: grid;
  grid-template-columns: 200px 90px 110px 180px minmax(0, 1fr);
  gap: 16px;
  padding: 10px 16px;
  align-items: baseline;
}
.rs-thead {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 600;
  color: var(--ink-muted);
  background: var(--bg-soft);
  border-bottom: 1px solid var(--rule-strong);
}
.rs-trow {
  border-bottom: 1px solid var(--rule);
  font-size: 12px;
  color: var(--ink-soft);
}
.rs-trow:last-child { border-bottom: 0; }
.rs-trow:hover { background: var(--bg-soft); }
.rs-tname { color: var(--ink); font-weight: 600; }
.rs-tsrc { color: var(--info-ink); font-size: 11px; }
.rs-tg {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  padding: 1px 6px;
  border: 1px solid var(--rule);
  align-self: start;
}
.rs-tg-truth { color: var(--accent-ink); border-color: rgba(196,89,32,0.4); background: rgba(196,89,32,0.06); }
.rs-tg-evid  { color: var(--info-ink); border-color: rgba(58,121,168,0.4); background: rgba(58,121,168,0.06); }
.rs-tg-seg   { color: var(--data-cyan); border-color: rgba(43,127,141,0.4); background: rgba(43,127,141,0.06); }
.rs-tg-corr  { color: var(--data-rust); border-color: rgba(192,89,53,0.4); background: rgba(192,89,53,0.06); }
.rs-tg-meta  { color: var(--ink-muted); }
.rs-trow span:last-child {
  font-family: var(--font-serif);
  font-size: 13.5px;
  color: var(--ink-soft);
  line-height: 1.45;
}
.rs-trow span:last-child code {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink);
  font-weight: 600;
}

/* ── cli ── */
.rs-cli {
  border: 1px solid var(--rule-strong);
  background: var(--bg-card);
}
.rs-cli-row {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr) minmax(0, 1.4fr);
  gap: 20px;
  padding: 14px 18px;
  align-items: baseline;
  border-bottom: 1px solid var(--rule);
}
.rs-cli-row:last-child { border-bottom: 0; }
.rs-cli-cmd {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}
.rs-cli-desc {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.5;
}
.rs-cli-ex {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-muted);
  background: var(--bg-soft);
  padding: 6px 10px;
  border: 1px solid var(--rule);
  white-space: nowrap;
  overflow-x: auto;
}

@media (max-width: 960px) {
  .rh-grid, .rh-stats { grid-template-columns: 1fr; }
  .rh-stats { grid-template-columns: 1fr 1fr; }
  .rsr { grid-template-columns: 52px minmax(0, 1fr); }
  .rsr-desc { grid-column: 1 / -1; padding-left: 68px; }
  .rs-thead, .rs-trow {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .rs-thead { display: none; }
  .rs-cli-row { grid-template-columns: 1fr; gap: 8px; }
  .rt-search { min-width: 0; width: 100%; }
}

/* ============================================================
   Capabilities grid — 6-card 3×2 layout for the homepage DSL
   section. Replaces the prior 3-phase phase-list layout.
   ============================================================ */

.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 24px 0 28px;
}

.cap-card {
  background: var(--bg-card);
  border: 1px solid var(--rule);
  padding: 20px 22px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 120ms ease, transform 120ms ease;
}
.cap-card:hover { border-color: var(--rule-strong); }

.cap-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
}
.cap-num {
  color: var(--ink);
  font-weight: 600;
  font-size: 11px;
}
.cap-tag {
  font-weight: 400;
  color: var(--ink-muted);
}

.cap-card h3 {
  margin: 4px 0 2px;
  font-size: 1.2rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.cap-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.55;
}
.cap-card p code {
  background: var(--bg-soft);
  padding: 1px 4px;
  font-size: 12.5px;
  border: 1px solid var(--rule);
}

/* per-card accent on the number — uses existing palette only */
.cap-recombine .cap-num { color: var(--seg-v); }      /* green */
.cap-mutate    .cap-num { color: var(--data-cyan); }  /* cyan */
.cap-clone     .cap-num { color: var(--archive); }    /* plum */
.cap-corrupt   .cap-num { color: var(--data-rust); }  /* rust */
.cap-constrain .cap-num { color: var(--accent-ink); } /* deep green */
.cap-replay    .cap-num { color: var(--info); }       /* cobalt */

/* code-window-wide — code block spans full width below the grid */
.code-window-wide { max-width: 920px; margin: 4px auto 0; }

@media (max-width: 1024px) {
  .cap-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .cap-grid { grid-template-columns: 1fr; }
}