:root {
  --bg: #0c0c0d;
  --paper: #f5f3ee;
  --ink: #1b1a17;
  --dim: #5c5a55;
  --faint: #8d8b85;
  --rule: #d8d4cb;
  --rule-soft: #e8e4d9;
  --panel: #f9f7f1;
  --panel-2: #efece3;
  --accent: #c1432b;
  --pos: #2d7a5f;
  --neg: #b5341e;
  /* fold identities — one hue per fold, used by chips + spotlights */
  --f-orders: #6b675f;
  --f-active: #2d7a5f;
  --f-region: #b07314;
  --f-avg:    #4a6da8;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --serif: "Charter", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; background: var(--paper); color: var(--ink); -webkit-font-smoothing: antialiased; }
body { font: 17px/1.65 var(--serif); }

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid currentColor; }
a:hover { color: var(--ink); }

/* ---- layout ---- */
.essay {
  max-width: 720px;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) clamp(1.25rem, 4vw, 2rem) 4rem;
}
.essay section { margin: 3.25rem 0; }

/* ---- masthead ---- */
.masthead { margin: 1rem 0 4rem; padding-bottom: 2rem; border-bottom: 1px solid var(--rule); }
.kicker {
  display: inline-block; font: 500 0.7rem var(--mono);
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent);
  margin-bottom: 1.25rem;
}
.masthead h1 {
  font: 500 clamp(2rem, 5vw, 3rem)/1.1 var(--serif);
  letter-spacing: -0.015em; margin: 0 0 1.5rem;
}
.standfirst { font: 400 1.1rem/1.55 var(--serif); color: var(--dim); margin: 0 0 1rem; max-width: 60ch; }
.byline { font: 0.8rem var(--mono); color: var(--faint); margin: 1.25rem 0 0; }
.byline a { color: var(--faint); border-bottom-color: var(--rule); }
.byline a:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ---- section heading ---- */
.hd { display: flex; align-items: baseline; gap: 1rem; margin: 0 0 1.5rem; }
.hno {
  font: 500 0.72rem var(--mono); letter-spacing: 0.15em; text-transform: uppercase;
  color: var(--accent); flex-shrink: 0; min-width: 2.5ch;
}
.essay h2 { font: 500 1.4rem/1.25 var(--serif); letter-spacing: -0.01em; margin: 0; max-width: 30ch; }

/* ---- prose ---- */
.essay p { margin: 0 0 1rem; max-width: 64ch; }
.essay p:last-child { margin-bottom: 0; }
.essay em { font-style: italic; }
.essay q { font-style: italic; quotes: '“' '”'; }
.essay q:before { content: open-quote; }
.essay q:after  { content: close-quote; }
.essay strong { font-weight: 600; }
.essay code {
  font: 0.86em var(--mono); background: var(--panel-2);
  padding: 0.05em 0.35em; border-radius: 3px; color: var(--ink);
}
pre.code {
  font: 13px/1.55 var(--mono); background: var(--panel);
  border: 1px solid var(--rule); border-radius: 6px;
  padding: 1rem 1.25rem; margin: 1.5rem 0; overflow-x: auto; color: var(--ink);
}
pre.code code { background: none; padding: 0; font-size: inherit; border-radius: 0; }
.muted { color: var(--faint); }

/* ---- figure base ---- */
.fig {
  margin: 1.75rem 0; padding: 1.25rem; background: var(--panel);
  border: 1px solid var(--rule); border-radius: 8px;
}
/* Figures sit in the prose column (no break-out) so nothing juts past the text;
 * the pinned change-history rail lives in the fixed left margin, clear of them. */

/* a brief highlight pulse, shared by records / edge / dom-fold flashes. */
@keyframes pflash {
  0%   { background: #fde7e0; border-color: var(--accent); }
  100% { background: transparent; }
}

/* =========================================================================
 * §1 — the duality: the changes ⟷ the table, two forms of one thing
 * ========================================================================= */
.fig.duality { padding: 1.25rem; }
.dz {
  display: grid; grid-template-columns: 1fr auto 1fr; gap: 0.9rem; align-items: stretch;
}
@media (max-width: 640px) {
  .dz { grid-template-columns: 1fr; gap: 0.6rem; }
  .dz-hinge { flex-direction: row !important; gap: 0.8rem !important; padding: 0.2rem 0 !important; }
  .dz-hinge .dz-eq { transform: rotate(90deg); }
}
.dz-side { display: flex; flex-direction: column; min-width: 0; }
.dz-cap {
  font: 0.66rem var(--mono); letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--faint); margin-bottom: 0.5rem; display: flex; gap: 0.5rem; align-items: baseline;
}
.dz-cap .dz-sub { text-transform: none; letter-spacing: 0; color: var(--faint); }
.dz-cap code { background: none; padding: 0; color: var(--dim); }

/* left — the real change records, scrollable + scrubbable */
.dz-records {
  flex: 1; display: flex; flex-direction: column; gap: 3px;
  min-height: 210px; max-height: 270px; overflow-y: auto;
  background: var(--paper); border: 1px solid var(--rule-soft); border-radius: 6px;
  padding: 0.4rem; cursor: ns-resize; user-select: none; scrollbar-width: thin;
}
.dz-records:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.drec {
  flex: 0 0 auto; display: flex; align-items: baseline; gap: 0.5rem;
  font: 12px var(--mono); padding: 0.28rem 0.5rem; border-radius: 4px;
  border: 1px solid transparent; color: var(--ink);
  transition: opacity 120ms, border-color 120ms, background 120ms;
}
.drec .dr-k { font-weight: 600; flex: 0 0 auto; }
.drec[data-type="insert"] .dr-k { color: var(--pos); }
.drec[data-type="remove"] .dr-k { color: var(--neg); }
.drec[data-type="update"] .dr-k { color: var(--f-avg); }
.drec .dr-id { color: var(--faint); flex: 0 0 auto; }
.drec .dr-v { color: var(--ink); font-weight: 600; margin-left: auto; text-align: right; }
.drec.ahead { opacity: 0.3; }
.drec.behind { opacity: 1; }
.drec.head { border-color: var(--accent); background: #fdf2ee; }
.drec:hover { border-color: var(--accent); }
.drec.flash { animation: pflash 600ms ease-out; }

/* middle — the duality hinge */
.dz-hinge {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.45rem; padding: 0 0.2rem; font: 0.64rem var(--mono); color: var(--faint);
}
.dz-hinge .dz-eq { font-size: 1.15rem; color: var(--dim); line-height: 1; }
.dz-arrow { white-space: nowrap; transition: color 160ms, transform 160ms; }
.dz-arrow.lit { color: var(--accent); transform: scale(1.08); }

/* right — the table (a live render() sink; rows reuse .frow) */
.dz-rows {
  flex: 1; background: var(--paper); border: 1px solid var(--rule-soft); border-radius: 6px;
  padding: 0.45rem 0.6rem; min-height: 210px; transition: border-color 200ms, box-shadow 200ms;
}
.dz-table.lit-orders .dz-rows { border-color: var(--f-orders); box-shadow: 0 0 0 1px var(--f-orders); }

.dz-detail { font: 0.76rem var(--mono); color: var(--dim); margin: 0.8rem 0 0.6rem; min-height: 1.1rem; }
.dz-detail b { color: var(--ink); }
.dz-detail .tag { color: var(--accent); }
.dz-controls { display: flex; flex-wrap: wrap; gap: 0.45rem; align-items: center; }
.dz-meta { font: 0.72rem var(--mono); color: var(--faint); margin-left: auto; font-variant-numeric: tabular-nums; }

/* =========================================================================
 * the change history — pinned in the left margin, scrubbable
 * ========================================================================= */
.tl-pin {
  position: fixed; z-index: 40;
  top: 96px; bottom: 96px;
  left: max(0.75rem, calc(50% - 360px - 116px)); width: 104px;
  display: flex; flex-direction: column; gap: 0.45rem;
  opacity: 0; transform: translateX(-8px); pointer-events: none;
  transition: opacity 240ms ease, transform 240ms ease;
}
.tl-pin.show { opacity: 1; transform: none; pointer-events: auto; }
.tl-pin-label { font: 500 0.62rem var(--mono); letter-spacing: 0.04em; color: var(--accent); text-align: right; }
.tl-pin-meta { font: 0.62rem var(--mono); color: var(--faint); text-align: right; font-variant-numeric: tabular-nums; }
.tl-pin-strip {
  flex: 1; display: flex; flex-direction: column; gap: 3px;
  overflow-y: auto; cursor: ns-resize; user-select: none;
  padding: 2px 0 2px 8px; border-left: 1px solid var(--rule);
  scrollbar-width: thin;
}
.tl-pin-strip:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
/* a clean line per record (a mini-timeline), not a pill: a colour-tick for the
 * change type + glyph + id, the head row picked out in accent. */
.pchip {
  flex: 0 0 auto; height: 19px;
  display: flex; align-items: center; gap: 5px;
  font: 0.58rem var(--mono); color: var(--faint); cursor: pointer; padding: 0 4px;
  border-left: 2px solid var(--rule); border-radius: 0 2px 2px 0;
  transition: opacity 120ms, color 120ms, border-color 120ms, background 120ms;
}
.pchip[data-type="insert"] { border-left-color: var(--f-active); }
.pchip[data-type="remove"] { border-left-color: var(--neg); }
.pchip[data-type="update"] { border-left-color: var(--f-avg); }
.pchip[data-type="insert"] .chip-g { color: var(--pos); }
.pchip[data-type="remove"] .chip-g { color: var(--neg); }
.pchip[data-type="update"] .chip-g { color: var(--f-avg); }
.pchip .chip-g { font-size: 0.72rem; line-height: 1; }
.pchip .pchip-id { color: var(--faint); }
.pchip.ahead { opacity: 0.3; }
.pchip.head { color: var(--ink); background: #fdf2ee; border-left-color: var(--accent); }
/* only show the left rail when the page is wide enough to have a margin for it */
@media (max-width: 1180px) { .tl-pin { display: none; } }

/* =========================================================================
 * the cast — a derivation diagram (orders → active → perRegion; orders → avg)
 * ========================================================================= */
.fig.cast { margin: 1.5rem 0; }
.fig.cast pre.code { margin: 0.9rem 0 0; }
.cast svg { width: 100%; height: auto; display: block; overflow: visible; max-width: 620px; margin: 0 auto; }
.cast .c-box { fill: var(--paper); stroke-width: 1.5; }
.cast .c-name { font: 600 13px var(--mono); }
.cast .c-edge { fill: none; stroke: var(--rule); stroke-width: 1.5; }
.cast .c-op { font: 10.5px var(--mono); fill: var(--dim); }
.cast .c-arrow { fill: var(--rule); }
.cast .c-src .c-box    { stroke: var(--f-orders); } .cast .c-src .c-name    { fill: var(--f-orders); }
.cast .c-active .c-box { stroke: var(--f-active); } .cast .c-active .c-name { fill: var(--f-active); }
.cast .c-region .c-box { stroke: var(--f-region); } .cast .c-region .c-name { fill: var(--f-region); }
.cast .c-avg .c-box    { stroke: var(--f-avg); }    .cast .c-avg .c-name    { fill: var(--f-avg); }

/* =========================================================================
 * §4 selectivity — a records × views matrix (a filled dot where a change
 * moved that view). Replaces the old chip strip.
 * ========================================================================= */
.selm {
  display: flex; flex-direction: column; gap: 2px;
  background: var(--paper); border: 1px solid var(--rule-soft); border-radius: 6px;
  padding: 0.45rem; max-height: 232px; overflow-y: auto; scrollbar-width: thin; user-select: none;
}
.selm-head, .selm-row {
  display: grid; grid-template-columns: 1fr 4rem 5.4rem 4rem; align-items: center;
  gap: 0.3rem; font: 12px var(--mono); font-variant-numeric: tabular-nums;
}
.selm-head { color: var(--faint); font-size: 0.64rem; letter-spacing: 0.04em; text-transform: uppercase; padding: 0 0.35rem 0.4rem; margin-bottom: 0.15rem; border-bottom: 1px solid var(--rule-soft); }
.selm-head span:not(:first-child) { text-align: center; }
.selm-head .sh-active { color: var(--f-active); }
.selm-head .sh-region { color: var(--f-region); }
.selm-head .sh-avg { color: var(--f-avg); }
.selm-row { padding: 0.24rem 0.35rem; border-radius: 4px; border: 1px solid transparent; color: var(--ink); cursor: pointer; transition: opacity 120ms, background 120ms, border-color 120ms; }
.selm-row .sm-change { display: flex; align-items: center; gap: 0.45rem; color: var(--dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.selm-row .sm-change .g { font-size: 0.82rem; flex: 0 0 auto; }
.selm-row[data-type="insert"] .sm-change .g { color: var(--pos); }
.selm-row[data-type="remove"] .sm-change .g { color: var(--neg); }
.selm-row[data-type="update"] .sm-change .g { color: var(--f-avg); }
.sm-cell { justify-self: center; width: 9px; height: 9px; border-radius: 50%; background: transparent; box-shadow: inset 0 0 0 1px var(--rule); }
.sm-cell.on { box-shadow: none; }
.sm-cell.on[data-v="active"]    { background: var(--f-active); }
.sm-cell.on[data-v="perRegion"] { background: var(--f-region); }
.sm-cell.on[data-v="avg"]       { background: var(--f-avg); }
.selm-row.ahead { opacity: 0.38; }
.selm-row.head { border-color: var(--accent); background: #fdf2ee; }
.selm-row:hover { border-color: var(--accent); }

.tlb {
  background: var(--paper); border: 1px solid var(--rule); border-radius: 6px;
  color: var(--ink); font: 500 0.8rem var(--mono); padding: 0.5rem 0.8rem;
  cursor: pointer; transition: border-color 140ms, color 140ms, background 140ms;
}
.tlb:hover { border-color: var(--accent); color: var(--accent); }
.tlb:active { background: #fdece6; }
.tlb-ghost { color: var(--faint); }

/* ---- folds ---- */
.folds-cap { font: 0.68rem var(--mono); letter-spacing: 0.05em; text-transform: uppercase; color: var(--faint); margin: 0.2rem 0 0.7rem; }
.folds { display: grid; grid-template-columns: 1.1fr 1fr 0.7fr; gap: 0.7rem; margin: 0 0 1.6rem; }
@media (max-width: 860px) { .folds { grid-template-columns: 1fr 1fr; } }
@media (max-width: 460px) { .folds { grid-template-columns: 1fr; } }
.fold {
  background: var(--paper); border: 1px solid var(--rule-soft); border-radius: 6px;
  padding: 0.7rem 0.8rem; min-height: 168px;
  transition: border-color 200ms, box-shadow 200ms;
}
.fold-h { display: flex; flex-direction: column; gap: 0.15rem; margin-bottom: 0.6rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--rule-soft); }
.fold-t { font: 600 0.78rem var(--mono); letter-spacing: 0.02em; }
.fold-sig { font: 0.68rem var(--mono); color: var(--faint); }
.fold-sig code { background: none; padding: 0; color: var(--faint); }
.fold[data-fold="orders"] .fold-t { color: var(--f-orders); }
.fold[data-fold="active"] .fold-t { color: var(--f-active); }
.fold[data-fold="perRegion"] .fold-t { color: var(--f-region); }
.fold[data-fold="avg"] .fold-t { color: var(--f-avg); }
/* spotlight (section in view, or chip hover feeds it) */
.fold.spotlight { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.fold.lit-active { border-color: var(--f-active); box-shadow: 0 0 0 1px var(--f-active); }
.fold.lit-perRegion { border-color: var(--f-region); box-shadow: 0 0 0 1px var(--f-region); }
.fold.lit-avg { border-color: var(--f-avg); box-shadow: 0 0 0 1px var(--f-avg); }
.fold.lit-orders { border-color: var(--f-orders); box-shadow: 0 0 0 1px var(--f-orders); }

/* fold rows */
.frow {
  display: flex; align-items: center; gap: 0.5rem;
  font: 12px var(--mono); padding: 0.18rem 0; color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.frow .fr-id { color: var(--faint); }
.frow .fr-reg { color: var(--dim); flex: 1; }
.frow .fr-val { font-weight: 600; }
.frow.fresh { animation: foldFresh 600ms ease-out; }
@keyframes foldFresh {
  0% { background: var(--pos); color: var(--paper); border-radius: 3px; padding-left: 0.3rem; padding-right: 0.3rem; }
  100% { background: transparent; padding-left: 0; padding-right: 0; }
}
.flist { display: block; }
.flist:empty::before { content: "∅ empty"; font: 12px var(--mono); color: var(--faint); }
.fempty { font: 12px var(--mono); color: var(--faint); padding: 0.2rem 0; }
/* region bars */
.rbar { display: grid; grid-template-columns: 3.2rem 1fr 1.6rem; align-items: center; gap: 0.4rem; font: 12px var(--mono); padding: 0.2rem 0; }
.rbar .rb-k { color: var(--dim); text-transform: capitalize; }
.rbar .rb-track { height: 8px; background: var(--panel-2); border-radius: 3px; overflow: hidden; }
.rbar .rb-fill { height: 100%; background: var(--f-region); border-radius: 3px; transition: width 220ms ease; }
.rbar .rb-n { text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; }
/* avg scalar */
.avg-scalar { font: 600 2rem var(--mono); color: var(--f-avg); font-variant-numeric: tabular-nums; margin-top: 0.5rem; }
.avg-unit { font: 0.7rem var(--mono); color: var(--faint); }

/* =========================================================================
 * §3 cost — the touch-the-table sweep: two strips of N row-ticks. data lights
 * ONE; recompute sweeps and lights every one.
 * ========================================================================= */
.cost-stage { position: relative; }
.sweep { display: flex; flex-direction: column; gap: 0.7rem; padding: 0.5rem 0.2rem; min-height: 150px; justify-content: center; }
.sweep-row { display: grid; grid-template-columns: 8.5rem 1fr 8.5rem; align-items: center; gap: 0.7rem; }
@media (max-width: 560px) { .sweep-row { grid-template-columns: 6rem 1fr; } .sweep-n { grid-column: 2; text-align: left !important; } }
.sweep-k { font: 0.72rem var(--mono); letter-spacing: 0.03em; text-transform: uppercase; }
.sweep-row[data-which="data"] .sweep-k { color: var(--pos); }
.sweep-row[data-which="recompute"] .sweep-k { color: var(--neg); }
.sweep-field {
  display: flex; gap: 1px; height: 40px; overflow: hidden;
  background: var(--paper); border: 1px solid var(--rule-soft); border-radius: 5px; padding: 4px;
}
.sweep-bar { flex: 1 1 0; min-width: 0; background: var(--panel-2); border-radius: 1px; transition: background 200ms ease; }
/* data: one row touched */
.sweep-field.lit .sweep-bar.hit { background: var(--pos); }
/* recompute: every row swept (staggered by inline transition-delay → a sweep) */
.sweep-field.swept .sweep-bar { background: var(--neg); }
.sweep-n { font: 0.74rem var(--mono); color: var(--faint); text-align: right; font-variant-numeric: tabular-nums; }
.sweep-row[data-which="data"] .sweep-n b { color: var(--pos); }
.sweep-row[data-which="recompute"] .sweep-n b { color: var(--neg); }

.cost-controls { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; margin-top: 0.9rem; }
.cost-note { font: 0.74rem var(--mono); color: var(--faint); }
.cost-note code { background: none; padding: 0; color: var(--dim); }
.cost-note b.win { color: var(--pos); }
.cost-n { font: 0.78rem var(--mono); color: var(--faint); display: flex; align-items: center; gap: 0.5rem; }
.cost-n select { font: 0.85rem var(--mono); color: var(--ink); background: var(--paper); border: 1px solid var(--rule); border-radius: 4px; padding: 0.25rem 0.5rem; }

/* =========================================================================
 * selectivity (matrix styles live up by the cast diagram)
 * ========================================================================= */
.sel-cap { font: 0.72rem var(--mono); color: var(--faint); margin-bottom: 0.7rem; }
.sel-detail { font: 0.76rem var(--mono); color: var(--dim); margin-top: 0.6rem; min-height: 1.1rem; }
.sel-detail b { color: var(--ink); }
.sel-detail .tag { color: var(--accent); }

/* =========================================================================
 * §5 a log at every edge
 * ========================================================================= */
.fig.edge { display: flex; flex-direction: column; gap: 0.5rem; align-items: flex-start; }
.edge-step { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.edge-where { font: 0.8rem var(--mono); color: var(--dim); min-width: 16ch; }
.edge-where b { color: var(--ink); font-weight: 600; }
.edge-rec {
  font: 13px var(--mono); background: var(--paper); border: 1px solid var(--rule-soft);
  border-radius: 4px; padding: 0.3rem 0.6rem; color: var(--ink);
}
.edge-rec.flash { animation: pflash 600ms ease-out; }
.edge-arrow { font: 0.74rem var(--mono); color: var(--faint); padding-left: 1rem; }
.edge-arrow code { background: none; padding: 0; color: var(--accent); }
.fig.edge .tlb { margin-top: 0.4rem; }

/* =========================================================================
 * §7 the DOM is the last fold
 * ========================================================================= */
.domfold-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 0.9rem; }
@media (max-width: 620px) { .domfold-cols { grid-template-columns: 1fr; } }
.domfold-side { display: flex; flex-direction: column; gap: 0.5rem; }
.domfold-h { font: 0.7rem var(--mono); letter-spacing: 0.04em; text-transform: uppercase; color: var(--faint); }
.domfold-h code { background: none; padding: 0; text-transform: none; color: var(--dim); }
.domfold-rec {
  font: 13px var(--mono); background: var(--paper); border: 1px solid var(--rule-soft);
  border-radius: 4px; padding: 0.45rem 0.65rem; color: var(--ink); min-height: 2.4rem;
  display: flex; align-items: center;
}
.domfold-rec.flash { animation: pflash 600ms ease-out; }
.domfold-op { font: 0.76rem var(--mono); color: var(--accent); }
.domfold-list {
  list-style: none; margin: 0; padding: 0.5rem; min-height: 7rem;
  background: var(--paper); border: 1px solid var(--rule-soft); border-radius: 6px;
}
.domfold-list .dl-row {
  font: 13px var(--mono); padding: 0.28rem 0.45rem; color: var(--ink);
  display: flex; gap: 0.5rem; border-radius: 3px;
  font-variant-numeric: tabular-nums;
}
.domfold-list .dl-row .dl-id { color: var(--faint); }
.domfold-list .dl-row .dl-reg { color: var(--dim); flex: 1; }
.domfold-list .dl-row .dl-val { font-weight: 600; }
.domfold-list .dl-val.fresh { display: inline-block; animation: foldFresh 700ms ease-out; }
.domfold-list .dl-row.fresh { animation: foldFresh 700ms ease-out; }
.domfold-list:empty::before, .flist:empty::before { content: "∅ empty"; font: 12px var(--mono); color: var(--faint); }
.domfold-controls { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* =========================================================================
 * §6 you never touch a delta — code contrast
 * ========================================================================= */
.fig.handsoff { padding: 1.25rem; }
.ho-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 680px) { .ho-cols { grid-template-columns: 1fr; } }
.ho-col { border-radius: 6px; overflow: hidden; border: 1px solid var(--rule-soft); display: flex; flex-direction: column; }
.ho-h { font: 0.7rem var(--mono); letter-spacing: 0.03em; text-transform: uppercase; padding: 0.5rem 0.7rem; }
.ho-bad .ho-h { color: var(--neg); background: rgba(181, 52, 30, 0.06); }
.ho-good .ho-h { color: var(--pos); background: rgba(45, 122, 95, 0.08); }
.ho-col pre { margin: 0; padding: 0.7rem 0.8rem; font: 12px/1.55 var(--mono); background: var(--paper); overflow-x: auto; flex: 1; }
.ho-col code { background: none; padding: 0; }
.ho-bad pre code { color: var(--dim); }
.ho-good pre code { color: var(--ink); }

/* ---- footer ---- */
.essay-foot {
  margin-top: 4rem; padding-top: 2rem; border-top: 1px solid var(--rule);
  display: flex; justify-content: space-between; align-items: baseline;
  font: 0.85rem var(--mono); color: var(--faint);
}
.essay-foot a { color: var(--accent); border-bottom-color: var(--rule); }
.essay-foot a:hover { color: var(--ink); }

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; transition-delay: 0ms !important; }
}