/* SILICA project page.  Colour tokens follow a validated categorical palette:
   ANSWER = slot 1 (blue), ABSTAIN = slot 2 (orange), exact oracle = slot 3 (aqua),
   emphasis = violet; everything else is neutral ink on a warm paper surface. */

:root {
  color-scheme: light;
  --page: #f7f6f2;
  --surface: #fcfcfb;
  --surface-2: #f1f0eb;
  --ink: #141413;
  --ink-2: #52514e;
  --muted: #6c6a65;
  --axis: #c3c2b7;
  --line: #e1e0d9;
  --ring: rgba(11, 11, 11, 0.1);
  --cell-alive: #3d3c39;
  --cell-dead: #e7e6df;
  --answer: #2a78d6;
  --abstain: #eb6834;
  --oracle: #1baf7a;
  --emphasis: #6250d6;
  --answer-wash: rgba(42, 120, 214, 0.12);
  --abstain-wash: rgba(235, 104, 52, 0.16);
  --emphasis-wash: rgba(98, 80, 214, 0.1);
  --on-accent: #ffffff;
  --shadow: 0 1px 2px rgba(20, 20, 19, 0.06), 0 8px 24px rgba(20, 20, 19, 0.08);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --radius: 14px;
  --gutter: 16px;
  --motion: 420ms;
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --page: #0d0d0d;
    --surface: #1a1a19;
    --surface-2: #222220;
    --ink: #f0efec;
    --ink-2: #c3c2b7;
    --muted: #a3a197;
    --axis: #4a4a46;
    --line: #2c2c2a;
    --ring: rgba(255, 255, 255, 0.1);
    --cell-alive: #d6d5ce;
    --cell-dead: #2a2a28;
    --answer: #3987e5;
    --abstain: #d95926;
    --oracle: #199e70;
    --emphasis: #9085e9;
    --answer-wash: rgba(57, 135, 229, 0.2);
    --abstain-wash: rgba(217, 89, 38, 0.24);
    --emphasis-wash: rgba(144, 133, 233, 0.16);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.4);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #0d0d0d;
  --surface: #1a1a19;
  --surface-2: #222220;
  --ink: #f0efec;
  --ink-2: #c3c2b7;
  --muted: #a3a197;
  --axis: #4a4a46;
  --line: #2c2c2a;
  --ring: rgba(255, 255, 255, 0.1);
  --cell-alive: #d6d5ce;
  --cell-dead: #2a2a28;
  --answer: #3987e5;
  --abstain: #d95926;
  --oracle: #199e70;
  --emphasis: #9085e9;
  --answer-wash: rgba(57, 135, 229, 0.2);
  --abstain-wash: rgba(217, 89, 38, 0.24);
  --emphasis-wash: rgba(144, 133, 233, 0.16);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.4);
}

@media (prefers-reduced-motion: reduce) {
  :root { --motion: 0ms; }
  *, *::before, *::after {
    animation-duration: 0s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0s !important;
    scroll-behavior: auto !important;
  }
}

/* --- base ---------------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font: 400 17px/1.62 var(--sans);
  overflow-wrap: break-word;
}
a { color: inherit; text-decoration-color: var(--axis); text-underline-offset: 3px; }
a:hover { text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--emphasis); outline-offset: 2px; border-radius: 4px; }
code, pre { font-family: var(--mono); font-size: 0.86em; }
code { background: var(--surface-2); padding: 0.08em 0.36em; border-radius: 5px; overflow-wrap: anywhere; }
pre code { background: none; padding: 0; }
p { margin: 0 0 1em; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.15; margin: 0; }
h2 { font-size: clamp(1.7rem, 1.2rem + 1.8vw, 2.45rem); letter-spacing: -0.01em; max-width: 26ch; margin-bottom: 0.7em; }
h3.sub { font-size: 1.4rem; margin: 2.4em 0 0.7em; }
svg { overflow: visible; }
button { font: inherit; color: inherit; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -9999px; top: 8px; background: var(--ink); color: var(--page); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.skip:focus { left: 8px; }

main > section {
  max-width: 1120px;
  margin: 0 auto;
  padding: 88px 32px 8px;
}
.prose { max-width: 68ch; }
.kicker {
  font: 600 0.78rem/1.2 var(--sans);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0 0 0.8em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.kicker::before { content: ""; width: 22px; height: 2px; background: linear-gradient(90deg, var(--answer) 50%, var(--abstain) 50%); border-radius: 2px; }

/* --- top bar ------------------------------------------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.topnav { max-width: 1120px; margin: 0 auto; padding: 0 32px; display: flex; align-items: center; gap: 24px; height: 52px; }
.brand { font: 700 1rem/1 var(--serif); letter-spacing: 0.06em; text-decoration: none; }
.topnav ul { list-style: none; display: flex; gap: 4px; margin: 0; padding: 0; overflow-x: auto; scrollbar-width: none; }
.topnav ul::-webkit-scrollbar { display: none; }
.topnav li a { display: block; padding: 6px 10px; border-radius: 8px; font-size: 0.9rem; color: var(--ink-2); text-decoration: none; white-space: nowrap; }
.topnav li a:hover { background: var(--surface-2); color: var(--ink); }

/* --- hero ---------------------------------------------------------------------- */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 56px;
  align-items: center;
  padding-top: 72px !important;
}
.hero h1 { display: flex; flex-direction: column; gap: 14px; margin-bottom: 26px; }
.wordmark {
  font-size: clamp(3.2rem, 2rem + 5vw, 5.4rem);
  letter-spacing: 0.04em;
  line-height: 0.95;
  background: linear-gradient(transparent 86%, var(--answer-wash) 86%, var(--answer-wash) 100%);
  width: max-content;
  max-width: 100%;
}
.subtitle { font-size: clamp(1.25rem, 1rem + 1vw, 1.7rem); font-weight: 500; line-height: 1.25; color: var(--ink); max-width: 30ch; }
.authors { list-style: none; display: flex; flex-wrap: wrap; gap: 6px 28px; padding: 0; margin: 0 0 26px; }
.authors .name { font-weight: 600; }
.authors .aff { color: var(--ink-2); display: block; font-size: 0.92rem; }
.buttons { list-style: none; display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 0 0 28px; }
.button {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px 9px 13px; border-radius: 999px;
  border: 1px solid var(--axis); background: var(--surface);
  font-weight: 600; font-size: 0.95rem; text-decoration: none;
  transition: background var(--motion), border-color var(--motion);
}
.button:hover { border-color: var(--ink); }
.button.primary { background: var(--ink); color: var(--page); border-color: var(--ink); }
.button svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.tldr { font-size: 1.04rem; color: var(--ink-2); max-width: 60ch; border-left: 3px solid var(--line); padding-left: 16px; margin: 0; }
.tldr strong { color: var(--ink); margin-right: 6px; letter-spacing: 0.04em; }

.hero-figure { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 22px; box-shadow: var(--shadow); }
.mini-frame { position: relative; }
.mini-count { display: flex; align-items: baseline; gap: 10px; margin-top: 14px; }
.mini-number { font: 600 2.6rem/1.15 var(--sans); letter-spacing: -0.02em; }
.mini-label { color: var(--ink-2); font-size: 0.95rem; }
.hero-figure figcaption { display: flex; align-items: flex-start; justify-content: space-between; gap: 14px; margin-top: 12px; font-size: 0.9rem; color: var(--ink-2); }

.chip {
  flex: none; display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--axis); background: var(--surface); border-radius: 999px;
  padding: 5px 12px; font-size: 0.85rem; font-weight: 600; cursor: pointer;
}
.chip-icon { width: 10px; height: 10px; display: inline-block; border-left: 3px solid currentColor; border-right: 3px solid currentColor; }
.chip[data-paused="true"] .chip-icon { border: none; width: 0; height: 0; border-left: 9px solid currentColor; border-top: 5px solid transparent; border-bottom: 5px solid transparent; }

/* --- version-space grid ----------------------------------------------------------- */

.vs-grid { display: block; width: 100%; height: auto; }
.vs-grid .cell { transition: fill var(--motion) ease, stroke var(--motion) ease, opacity var(--motion) ease; }
.vs-grid .cell.alive { fill: var(--cell-alive); stroke: none; }
.vs-grid .cell.dead { fill: var(--cell-dead); stroke: none; }
.vs-grid .cell.answer { fill: var(--answer); }
.vs-grid .cell.subject { fill: var(--abstain); }
.vs-grid .cell.verb { fill: var(--abstain-wash); stroke: var(--abstain); stroke-width: 1.5; }
.vs-grid .glyph { font: 700 10px/1 var(--sans); text-anchor: middle; dominant-baseline: central; pointer-events: none; transition: opacity var(--motion); }
.vs-grid .glyph.on-fill { fill: var(--on-accent); }
.vs-grid .glyph.on-wash { fill: var(--ink); }
.vs-grid .cursor { fill: none; stroke: var(--emphasis); stroke-width: 2; pointer-events: none; }
.vs-grid .witness-ring { fill: none; stroke: var(--ink); stroke-width: 2; }
.vs-grid .witness-label { font: 600 11px/1 var(--mono); fill: var(--ink); }
.vs-grid .witness-leader { stroke: var(--ink); stroke-width: 1; }
.vs-grid .axis-label { font: 500 10.5px/1 var(--sans); fill: var(--ink-2); }
.vs-grid.mini .cell { transition-duration: 300ms; }

/* --- stepper ------------------------------------------------------------------------ */

.stepper, .constant-figure, .route-figure, .ladder-figure, .gates-figure, .scatter-figure, .ladder-chart,
.controls-figure, .ablation-figure, .ops-figure, .probe-figure { margin: 28px 0 0; }

.stepper { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 22px; box-shadow: var(--shadow); }
.stepper-controls { display: flex; align-items: center; gap: 8px; }
.icon-button {
  width: 40px; height: 40px; flex: none; display: grid; place-items: center;
  border-radius: 50%; border: 1px solid var(--axis); background: var(--surface); cursor: pointer;
}
.icon-button:hover { border-color: var(--ink); }
.icon-button svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.icon-button.play { background: var(--ink); color: var(--page); border-color: var(--ink); }
.icon-button.play .icon-play { fill: currentColor; }
.icon-button.play .icon-pause { display: none; }
.icon-button.play[data-playing="true"] .icon-play { display: none; }
.icon-button.play[data-playing="true"] .icon-pause { display: block; stroke-width: 2.4; }
.icon-button:disabled { opacity: 0.4; cursor: default; }
.scrub { flex: 1; display: flex; align-items: center; min-width: 0; margin-left: 8px; }
input[type="range"] { width: 100%; accent-color: var(--ink); height: 28px; cursor: pointer; }

.step-track { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 16px 0 20px; }
.step-track button {
  border: 1px solid var(--line); background: var(--surface-2); color: var(--ink-2);
  border-radius: 999px; padding: 4px 11px; font-size: 0.82rem; cursor: pointer;
  transition: background var(--motion), color var(--motion), border-color var(--motion);
}
.step-track button[aria-current="step"] { background: var(--ink); border-color: var(--ink); color: var(--page); }
.step-track button.done { color: var(--ink); border-color: var(--axis); }

.stepper-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; align-items: start; }
.grid-panel { min-width: 0; }
.grid-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 4px 16px; margin-bottom: 10px; }
.grid-count { margin: 0; display: flex; align-items: baseline; gap: 8px; }
.count-number { font: 600 2.2rem/1.15 var(--sans); letter-spacing: -0.02em; }
.count-unit { color: var(--ink-2); font-size: 0.92rem; }
.grid-wrap { position: relative; max-width: 470px; }
.grid-wrap .vs-grid { outline-offset: 4px; }

.panel-label { display: flex; align-items: center; flex-wrap: wrap; gap: 6px 8px; font: 600 0.82rem/1.3 var(--sans); letter-spacing: 0.06em; text-transform: uppercase; margin: 0; }
.panel-label svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.panel-label .note { text-transform: none; letter-spacing: 0; font-weight: 400; color: var(--ink-2); font-size: 0.85rem; }

.legend { list-style: none; display: flex; flex-wrap: wrap; gap: 6px 16px; padding: 0; margin: 12px 0 0; font-size: 0.85rem; color: var(--ink-2); }
.legend li { display: inline-flex; align-items: center; gap: 7px; }
.swatch { width: 15px; height: 15px; border-radius: 3px; display: inline-grid; place-items: center; font: 700 9px/1 var(--sans); }
.swatch.alive { background: var(--cell-alive); }
.swatch.dead { background: var(--cell-dead); }
.swatch.answer { background: var(--answer); color: var(--on-accent); }
.swatch.abstain-s { background: var(--abstain); color: var(--on-accent); }
.swatch.abstain-v { background: var(--abstain-wash); box-shadow: inset 0 0 0 1.5px var(--abstain); color: var(--ink); }
.dot { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.dot.solid { background: var(--ink); }
.dot.hollow { box-shadow: inset 0 0 0 2px var(--ink); }
.dot.oracle { background: var(--oracle); transform: rotate(45deg); border-radius: 2px; }
.line-key { width: 18px; height: 2px; background: var(--ink-2); border-radius: 1px; display: inline-block; }
.area-key { width: 15px; height: 11px; background: var(--answer-wash); display: inline-block; border-radius: 2px; }

.caption { margin: 14px 0 0; font-size: 0.98rem; min-height: 3.2em; color: var(--ink); }
.side-panels { display: grid; gap: 16px; min-width: 0; }
.card { background: var(--page); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; min-width: 0; }
.card h3.panel-label { margin-bottom: 12px; font-family: var(--sans); }
.visible-card .panel-label.visible { color: var(--ink); }
.field { border-left: 3px solid transparent; padding: 6px 0 6px 12px; margin: 0 0 6px -15px; border-radius: 0 8px 8px 0; transition: background var(--motion), border-color var(--motion); }
.field.active { border-left-color: var(--ink); background: var(--surface); }
.field-name { font-size: 0.82rem; color: var(--ink-2); margin: 0 0 4px; }
.field-name code { font-size: 0.78rem; }
.field-note { font-size: 0.8rem; color: var(--ink-2); margin: 6px 0 0; }
.program { font: 0.82rem/1.55 var(--mono); }
.program div { padding: 2px 0; overflow-wrap: anywhere; }
.program .constraint-name { color: var(--ink-2); margin-right: 6px; }
.raw summary { cursor: pointer; font-size: 0.82rem; color: var(--ink-2); margin-top: 6px; }
.raw pre { max-height: 260px; overflow: auto; background: var(--surface-2); padding: 10px 12px; border-radius: 8px; font-size: 0.74rem; line-height: 1.45; margin: 8px 0 0; }
.facts, .queries { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; }
.facts li, .queries li { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 8px; padding: 3px 8px; border-radius: 8px; font-size: 0.92rem; transition: background var(--motion); }
.facts li.active, .queries li.active { background: var(--surface-2); }
.facts .form, .queries .form { font: 600 0.92rem/1.3 var(--mono); }
.facts .pin { color: var(--ink-2); font-size: 0.82rem; }
.rule { font-size: 0.88rem; margin: 0; }
.rule p { margin: 0 0 5px; }

.tag { display: inline-block; font: 700 0.7rem/1 var(--sans); letter-spacing: 0.05em; padding: 4px 7px 3px; border-radius: 5px; color: var(--on-accent); vertical-align: 0.1em; white-space: nowrap; }
.tag.answer { background: var(--answer); }
.tag.answer::before { content: "\2713\00a0"; }
.tag.abstain { background: var(--abstain); }
.tag.abstain::before { content: "\2205\00a0"; }

.readouts { display: grid; gap: 12px; }
.readout { border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; background: var(--surface); transition: opacity var(--motion), border-color var(--motion); }
.readout.pending { opacity: 0.45; }
.readout.active { border-color: var(--ink); }
.readout-head { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; margin-bottom: 8px; font-size: 0.9rem; }
.strip { display: block; width: 100%; height: auto; max-width: 360px; margin: 2px 0 8px; }
.readout .support { font-size: 0.86rem; color: var(--ink-2); margin: 0 0 6px; }
.readout pre { margin: 0; font-size: 0.78rem; background: var(--surface-2); padding: 7px 10px; border-radius: 7px; overflow-x: auto; }
.readout .pending-note { font-size: 0.86rem; color: var(--ink-2); margin: 0; }
.evaluator-card { background: var(--surface-2); }

.table-view { margin-top: 18px; }
.table-view > summary { cursor: pointer; font-size: 0.9rem; font-weight: 600; color: var(--ink-2); }
.table-scroll { overflow-x: auto; margin-top: 10px; }
.bits-table, .data-table { border-collapse: collapse; font-size: 0.84rem; font-variant-numeric: tabular-nums; }
.bits-table th, .bits-table td, .data-table th, .data-table td { padding: 5px 9px; border-bottom: 1px solid var(--line); text-align: right; white-space: nowrap; }
.bits-table th:first-child, .bits-table td:first-child, .data-table th:first-child, .data-table td:first-child { text-align: left; }
.bits-table th, .data-table th { font-weight: 600; color: var(--ink-2); }
.bits-table td.pinned { background: var(--surface-2); }
.bits-table td.queried-a { box-shadow: inset 0 0 0 2px var(--answer); }
.bits-table td.queried-b { box-shadow: inset 0 0 0 2px var(--abstain); }
.data-table td.label { font-weight: 600; }
.data-table tr.reference td { color: var(--ink-2); }

.tooltip {
  position: absolute; z-index: 4; pointer-events: none;
  background: var(--surface); color: var(--ink); border: 1px solid var(--line); box-shadow: var(--shadow);
  border-radius: 10px; padding: 9px 12px; font-size: 0.82rem; line-height: 1.45; width: max-content; max-width: 260px;
}
.tooltip strong { font-size: 0.95rem; }
.tooltip .row { display: flex; justify-content: space-between; gap: 16px; font-variant-numeric: tabular-nums; }
.tooltip .row span:first-child { color: var(--ink-2); }

.quote { margin: 36px 0 0; max-width: 68ch; padding: 4px 0 4px 20px; border-left: 3px solid var(--line); font-family: var(--serif); font-size: 1.12rem; line-height: 1.55; }
.quote p { margin: 0 0 6px; }
.quote footer { font: 0.85rem var(--sans); color: var(--ink-2); }
.quote.inline { margin: 18px 0; font-size: 1.05rem; }

/* --- constant policy ---------------------------------------------------------------- */

.constant-figure { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 22px; box-shadow: var(--shadow); }
.constant-controls { max-width: 560px; }
.slider-label { display: flex; justify-content: space-between; align-items: baseline; font-weight: 600; gap: 12px; }
.alpha-value { font: 600 1.1rem var(--sans); font-variant-numeric: tabular-nums; }
.slider-ends { display: flex; justify-content: space-between; font-size: 0.8rem; color: var(--ink-2); }
.constant-body { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 32px; margin-top: 22px; align-items: start; }
.plane-wrap { position: relative; max-width: 440px; }
.plane { display: block; width: 100%; height: auto; }
.plane .grid-line { stroke: var(--line); stroke-width: 1; }
.plane .axis { stroke: var(--axis); stroke-width: 1; }
.plane .tick { font: 11px var(--sans); fill: var(--muted); font-variant-numeric: tabular-nums; }
.plane .axis-title { font: 600 11.5px var(--sans); fill: var(--ink-2); }
.plane .diagonal { stroke: var(--ink-2); stroke-width: 2; stroke-linecap: round; }
.plane .diagonal-label { font: 11.5px var(--sans); fill: var(--ink-2); }
.plane .region { fill: var(--answer-wash); }
.plane .region-label { font: italic 11.5px var(--serif); fill: var(--ink-2); }
.plane .oracle { fill: var(--oracle); stroke: var(--surface); stroke-width: 2; }
.plane .oracle-label { font: 600 11.5px var(--sans); fill: var(--ink); }
.plane .policy { fill: var(--ink); stroke: var(--surface); stroke-width: 2; transition: cx 160ms, cy 160ms; }
.plane .policy-label { font: 600 12px var(--sans); fill: var(--ink); font-variant-numeric: tabular-nums; }
.plane .point { fill: var(--ink); stroke: var(--surface); stroke-width: 2; }
.plane .point.hollow { fill: var(--surface); stroke: var(--ink); stroke-width: 2; }
.plane .point.emphasis { fill: var(--emphasis); }
.plane .leader { stroke: var(--axis); stroke-width: 1; fill: none; }
.plane .label { font: 12px var(--sans); fill: var(--ink); }
.plane .label.sub { fill: var(--ink-2); }
.plane .hit { fill: transparent; cursor: pointer; }
.plane .hit:focus { outline: none; }
.plane g.target:focus-visible .focus-ring, .plane g.target.hover .focus-ring { stroke: var(--emphasis); stroke-width: 2; fill: none; }
.plane .focus-ring { stroke: none; fill: none; }
.plane g.target.hover .label, .plane g.target:focus-visible .label { font-weight: 700; }

.tiles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 0; }
.tiles div { background: var(--page); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.tiles dt { font-size: 0.82rem; color: var(--ink-2); font-weight: 600; }
.tiles dd { margin: 4px 0 0; font: 600 1.9rem/1.2 var(--sans); letter-spacing: -0.01em; }
.tiles dd small { display: block; font: 400 0.78rem/1.3 var(--sans); color: var(--ink-2); letter-spacing: 0; margin-top: 4px; }
.formulas { margin: 16px 0; font: 0.88rem/1.7 var(--mono); color: var(--ink); }
.formulas div { padding: 2px 0; }
.meter-title { font-size: 0.86rem; font-weight: 600; color: var(--ink-2); margin: 0 0 6px; }
.bja-meter { display: block; width: 100%; height: auto; }
.bja-meter .track { fill: var(--surface-2); }
.bja-meter .fill { fill: var(--ink); transition: width 160ms; }
.bja-meter .ref { stroke: var(--ink-2); stroke-width: 1.5; }
.bja-meter .ref.oracle { stroke: var(--oracle); stroke-width: 3; }
.bja-meter .ref-label { font: 11px var(--sans); fill: var(--ink-2); }
.bja-meter .value-label { font: 600 12px var(--sans); fill: var(--ink); }

.defs { display: grid; gap: 6px; margin: 30px 0 18px; }
.defs div { display: grid; grid-template-columns: 7.5em minmax(0, 1fr); gap: 12px; }
.defs dt { font: 600 0.9rem var(--mono); }
.defs dd { margin: 0; color: var(--ink-2); }

/* --- construction --------------------------------------------------------------------- */

.route-scroll { overflow-x: auto; padding-bottom: 4px; }
.route-grid { display: grid; grid-template-columns: minmax(118px, 0.8fr) repeat(4, minmax(118px, 1fr)); gap: 8px; min-width: 620px; }
.route-grid .head { font-size: 0.78rem; color: var(--ink-2); padding: 4px 6px; }
.route-grid .head.state { font-family: var(--mono); font-size: 0.74rem; line-height: 1.4; }
.route-grid .head.state b { font-family: var(--sans); font-size: 0.78rem; color: var(--ink); display: block; margin-bottom: 2px; }
.route-grid .role { font-size: 0.85rem; padding: 10px 6px; display: flex; flex-direction: column; gap: 3px; justify-content: center; }
.route-grid .role code { font-size: 0.8rem; width: max-content; max-width: 100%; }
.route-grid .role .unit, .route-grid .cell .unit { font-size: 0.75rem; color: var(--ink-2); }
.route-grid .cell .tag { align-self: flex-start; }
.route-grid .cell { border-radius: 10px; padding: 10px; display: flex; flex-direction: column; gap: 4px; justify-content: center; min-height: 64px; border: 1px solid var(--line); background: var(--surface); }
.route-grid .cell.answer { background: var(--answer-wash); border-color: var(--answer); }
.route-grid .cell.abstain { background: var(--abstain-wash); border-color: var(--abstain); }
.route-grid .cell.example { box-shadow: 0 0 0 2px var(--ink); }
.route-grid .cell .payload { font: 0.82rem var(--mono); }
.route-figure figcaption { font-size: 0.86rem; color: var(--ink-2); margin-top: 10px; max-width: 72ch; }

.ladder { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; border-top: 1px solid var(--line); }
.ladder li { display: grid; grid-template-columns: 8.2rem minmax(0, 1.1fr) minmax(0, 1.4fr); gap: 4px 24px; align-items: baseline; padding: 14px 0; border-bottom: 1px solid var(--line); }
.ladder .count { font: 600 1.7rem/1.15 var(--sans); letter-spacing: -0.01em; }
.ladder .level { font-weight: 600; }
.ladder .level small { display: block; font-weight: 400; color: var(--ink-2); font-size: 0.86rem; }
.ladder .role { color: var(--ink-2); font-size: 0.92rem; }
.ladder li.primary .count { color: var(--ink); }
.ladder li.primary .level::after { content: "primary resampling unit"; display: inline-block; margin-left: 8px; font: 600 0.68rem/1 var(--sans); letter-spacing: 0.05em; text-transform: uppercase; padding: 4px 6px; border-radius: 4px; background: var(--emphasis-wash); color: var(--ink); vertical-align: 0.15em; }
.ladder li.unscored { opacity: 0.75; }
.ladder-figure figcaption, .gates-figure figcaption, .ops-figure figcaption, .probe-figure figcaption, .ablation-figure figcaption, .controls-figure figcaption { font-size: 0.86rem; color: var(--ink-2); margin-top: 12px; max-width: 76ch; }

.gates { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; }
.gates li { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) 14rem; gap: 6px 20px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--line); }
.gates li.group { display: block; border-bottom: none; padding: 18px 0 4px; font: 600 0.78rem/1.2 var(--sans); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-2); }
.gates .gate-name { font-size: 0.95rem; }
.gates .gate-name small { display: block; color: var(--ink-2); font-size: 0.82rem; }
.gates .bar { position: relative; height: 10px; background: var(--surface-2); border-radius: 999px; overflow: visible; }
.gates .bar .fill { position: absolute; inset: 0 auto 0 0; background: var(--ink-2); border-radius: 999px; }
.gates .bar .mark { position: absolute; top: -5px; bottom: -5px; width: 2px; background: var(--ink); border-radius: 1px; }
.gates .bar .mark-label { position: absolute; top: 12px; transform: translateX(-50%); font-size: 0.7rem; color: var(--ink-2); white-space: nowrap; }
.gates li.chance .bar { margin-bottom: 14px; }
.gates .figure { font: 600 0.98rem var(--sans); font-variant-numeric: tabular-nums; text-align: right; display: flex; align-items: center; justify-content: flex-end; gap: 7px; }
.gates .figure svg { width: 15px; height: 15px; flex: none; fill: none; stroke: var(--ink); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* --- results -------------------------------------------------------------------------- */

.results-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; align-items: start; margin-top: 28px; }
.results-grid.second { grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); }
.results-grid .prose { max-width: none; }
.figure-title { font-weight: 600; font-size: 0.95rem; margin-bottom: 10px; max-width: 46ch; }
.scatter-figure, .ladder-chart { margin: 0; }
.scatter-figure .plane-wrap { max-width: 520px; }
.bja-ladder { display: block; width: 100%; height: auto; }
.bja-ladder .row-label { font: 12px var(--sans); fill: var(--ink); }
.bja-ladder .row-value { font: 600 12px var(--sans); fill: var(--ink); font-variant-numeric: tabular-nums; }
.bja-ladder .ci { stroke: var(--ink-2); stroke-width: 2; stroke-linecap: round; }
.bja-ladder .ref { stroke: var(--ink-2); stroke-width: 1.5; }
.bja-ladder .ref.oracle { stroke: var(--oracle); stroke-width: 2.5; }
.bja-ladder .ref-label { font: 11px var(--sans); fill: var(--ink-2); }
.bja-ladder .grid-line { stroke: var(--line); }
.bja-ladder .tick { font: 11px var(--sans); fill: var(--muted); font-variant-numeric: tabular-nums; }

.stat-tile { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 22px 24px; box-shadow: var(--shadow); }
.stat-label { font-size: 0.86rem; font-weight: 600; color: var(--ink-2); margin: 0 0 14px; }
.stat-value { font: 600 3.6rem/1.1 var(--sans); letter-spacing: -0.03em; margin: 0 0 14px; }
.stat-note { font-size: 0.9rem; color: var(--ink-2); margin: 0; }
.scope-note { display: flex; gap: 10px; align-items: flex-start; margin-top: 28px; padding: 14px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; font-size: 0.95rem; max-width: 80ch; }
.scope-note svg { width: 18px; height: 18px; flex: none; margin-top: 3px; fill: none; stroke: var(--ink-2); stroke-width: 1.5; stroke-linecap: round; }

/* --- controls ------------------------------------------------------------------------- */

.segmented { display: inline-flex; flex-wrap: wrap; gap: 4px; padding: 4px; background: var(--surface-2); border: 1px solid var(--line); border-radius: 14px; max-width: 100%; }
.segmented button { border: none; background: transparent; border-radius: 10px; padding: 8px 14px; font-weight: 600; font-size: 0.92rem; color: var(--ink-2); cursor: pointer; display: inline-flex; align-items: center; gap: 8px; text-align: left; }
.segmented button[aria-pressed="true"] { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.controls-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 18px; }
.control-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; transition: border-color var(--motion), background var(--motion); }
.control-card.moved { border-color: var(--emphasis); background: color-mix(in srgb, var(--surface) 92%, var(--emphasis)); }
.control-card h3 { font: 600 1.05rem/1.2 var(--sans); margin: 0; }
.control-card .condition { font-size: 0.85rem; color: var(--ink-2); margin: 3px 0 12px; min-height: 1.3em; }
.metric { display: grid; grid-template-columns: 5.6rem minmax(0, 1fr) 4.4rem; gap: 10px; align-items: center; padding: 5px 0; }
.metric .name { font-size: 0.82rem; color: var(--ink-2); font-weight: 600; }
.metric .value { font: 600 0.95rem var(--sans); font-variant-numeric: tabular-nums; text-align: right; }
.metric .bar { position: relative; height: 12px; background: var(--surface-2); border-radius: 3px; }
.metric .bar .fill { position: absolute; top: 0; bottom: 0; background: var(--ink-2); border-radius: 3px; transition: left var(--motion) ease, width var(--motion) ease, background var(--motion); }
.control-card.moved .metric .bar .fill { background: var(--emphasis); }
.metric .bar .zero, .metric .bar .ref { position: absolute; top: -3px; bottom: -3px; width: 1.5px; background: var(--ink); opacity: 0.55; }
.metric.tokens .bar { background: none; }

/* --- ablations and ops ---------------------------------------------------------------- */

.ablation-planes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.ablation-plane h3 { font: 600 1.05rem/1.2 var(--sans); margin: 0 0 4px; }
.ablation-plane .summary { font-size: 0.88rem; color: var(--ink-2); margin: 0 0 10px; }
.ablation-plane .summary b { color: var(--ink); font-variant-numeric: tabular-nums; }
.ops { display: grid; gap: 20px; }
.ops-row { display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: 8px 24px; align-items: center; }
.ops-row .ops-label { font-size: 0.92rem; }
.ops-row .ops-label b { display: block; font: 600 1.6rem/1.1 var(--sans); letter-spacing: -0.01em; }
.ops-row svg { display: block; width: 100%; height: auto; max-width: 768px; }
.ops-row .ops-cells { fill: var(--ink-2); }
.ops-row .ops-cells.min { fill: var(--emphasis); }
.ops-row .ops-outline { fill: none; stroke: var(--emphasis); stroke-width: 1.5; }

/* --- use ------------------------------------------------------------------------------- */

.commands { display: grid; grid-template-columns: minmax(0, 1fr); gap: 18px; margin-top: 20px; }
.command { min-width: 0; }
.command-title { font-weight: 600; margin: 0 0 8px; font-size: 0.95rem; }
.code-block { position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }
.code-block pre { margin: 0; padding: 16px 92px 16px 18px; overflow-x: auto; font-size: 0.84rem; line-height: 1.6; }
.copy { position: absolute; top: 10px; right: 10px; border: 1px solid var(--axis); background: var(--surface); border-radius: 8px; padding: 4px 10px; font-size: 0.8rem; font-weight: 600; cursor: pointer; }
.copy:hover { border-color: var(--ink); }
.copied { min-height: 1.4em; font-size: 0.85rem; color: var(--ink-2); margin-top: 8px; }

.viewer { margin-top: 18px; }
.viewer-panes { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 14px; }
.pane { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; min-width: 0; }
.pane .panel-label { margin-bottom: 10px; }
.json-tree { font: 0.78rem/1.55 var(--mono); max-height: 460px; overflow: auto; }
.json-tree details { margin-left: 14px; }
.json-tree > details { margin-left: 0; }
.json-tree summary { cursor: pointer; list-style-position: outside; }
.json-tree .key { color: var(--ink); font-weight: 600; }
.json-tree .str { color: var(--ink-2); overflow-wrap: anywhere; }
.json-tree .lit { color: var(--ink); }
.json-tree .leaf { margin-left: 14px; overflow-wrap: anywhere; }
.json-tree .meta { color: var(--muted); }
.prompt-raw { margin-top: 14px; }
.prompt-raw .message { margin-top: 10px; }
.prompt-raw .message p { font-size: 0.82rem; font-weight: 600; margin: 0 0 4px; }
.prompt-raw pre { white-space: pre-wrap; overflow-wrap: anywhere; max-height: 320px; }
.responses { margin-top: 20px; }
.responses-note { font-size: 0.9rem; color: var(--ink-2); }
.data-table td.text, .data-table th.text { text-align: left; white-space: normal; min-width: 14rem; }
.data-table td.text code { white-space: pre-wrap; }

#cite .code-block pre { white-space: pre-wrap; overflow-wrap: anywhere; }

.limits { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; max-width: 76ch; }
.limits li { padding: 14px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; }

.site-footer { max-width: 1120px; margin: 96px auto 0; padding: 28px 32px 48px; border-top: 1px solid var(--line); font-size: 0.88rem; color: var(--ink-2); }
.footer-links { display: flex; gap: 20px; font-weight: 600; color: var(--ink); }
.provenance .hash { font-size: 0.78rem; }
.noscript { max-width: 1120px; margin: 0 auto; padding: 16px 32px; }

/* --- responsive ------------------------------------------------------------------------ */

@media (max-width: 980px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 36px; }
  .hero-figure { max-width: 520px; }
  .stepper-body, .constant-body, .results-grid, .results-grid.second { grid-template-columns: minmax(0, 1fr); }
  .controls-cards { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  main > section { padding: 64px var(--gutter) 4px; }
  .topnav { padding: 0 var(--gutter); gap: 14px; }
  .site-footer { padding: 24px var(--gutter) 40px; }
  .hero { padding-top: 44px !important; }
  .stepper, .constant-figure, .hero-figure { padding: 16px; border-radius: 16px; }
  .ladder li { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .gates li { grid-template-columns: minmax(0, 1fr) auto; }
  .gates .bar { grid-column: 1 / -1; grid-row: 2; }
  .gates .figure { grid-column: 2; grid-row: 1; }
  .ablation-planes, .viewer-panes { grid-template-columns: minmax(0, 1fr); }
  .ops-row { grid-template-columns: minmax(0, 1fr); }
  .defs div { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .tiles dd { font-size: 1.6rem; }
  .stat-value { font-size: 2.9rem; }
  .code-block pre { padding-right: 18px; padding-top: 44px; }
  .metric { grid-template-columns: 4.8rem minmax(0, 1fr) 4rem; }
}

@media (forced-colors: active) {
  .vs-grid .cell.alive, .vs-grid .cell.answer, .vs-grid .cell.subject { fill: CanvasText; }
  .vs-grid .cell.verb { fill: Canvas; stroke: CanvasText; }
  .tag { border: 1px solid CanvasText; }
}

/* --- plain-language layer ------------------------------------------------------------- */

.plain-lead { font-size: 1.12rem; line-height: 1.6; max-width: 60ch; margin: 0 0 16px; padding: 14px 16px; background: var(--answer-wash); border-radius: 12px; }
.plain-lead strong, .in-short strong { display: block; font: 700 0.74rem/1.2 var(--sans); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-2); margin-bottom: 6px; }
.tldr strong { display: block; margin-bottom: 4px; font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; }
.tech-title { font: italic 1.02rem/1.4 var(--serif); color: var(--ink-2); margin: -0.4em 0 1.1em; max-width: 60ch; }
.in-short { max-width: 68ch; margin: 0 0 22px; padding: 14px 18px; border-left: 4px solid var(--answer); background: var(--surface); border-radius: 0 12px 12px 0; box-shadow: var(--shadow); }
.in-short p { margin: 0; font-size: 1.04rem; }

.step-cards { list-style: none; padding: 0; margin: 28px 0 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.step-card { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 18px; display: flex; flex-direction: column; gap: 10px; box-shadow: var(--shadow); min-width: 0; }
.step-card h3 { font-size: 1.18rem; }
.card-step { font: 700 0.72rem/1 var(--sans); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-2); margin: 0; }
.card-visual { min-height: 120px; display: flex; flex-direction: column; justify-content: center; gap: 8px; }
.card-visual .vs-grid.mini { max-width: 150px; }
.card-text { font-size: 0.95rem; line-height: 1.55; margin: 0; flex: 1; }
.card-expr { font: 600 0.92rem/1.5 var(--mono); margin: 0; padding: 8px 10px; background: var(--surface-2); border-radius: 8px; overflow-wrap: anywhere; }
.card-expr .tag { font-size: 0.62rem; }
.switches { display: block; width: 100%; height: auto; max-width: 280px; }
.switches .switch-track { fill: var(--cell-dead); stroke: var(--axis); stroke-width: 1; }
.switches .switch-track.on { fill: var(--ink-2); stroke: var(--ink-2); }
.switches .switch-knob { fill: var(--surface); stroke: var(--ink-2); stroke-width: 1.5; }
.switches .switch-label { font: 600 10.5px var(--mono); fill: var(--ink-2); }
.switches .switch-group { font: 600 10.5px var(--sans); fill: var(--ink-2); letter-spacing: 0.06em; text-transform: uppercase; }
.bubbles { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.bubbles li { background: var(--surface-2); border-radius: 14px 14px 14px 4px; padding: 8px 12px; font-size: 0.92rem; width: fit-content; max-width: 100%; }
.card-strip { display: flex; flex-direction: column; gap: 4px; }
.card-strip .tag { align-self: flex-start; }
.card-strip .strip { max-width: 100%; }

.callouts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 20px; }
.callout { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 16px 18px; }
.callout h3 { font-size: 1.1rem; margin-bottom: 8px; }
.callout p { margin: 0; font-size: 0.98rem; }

.glossary { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 24px; margin: 0; max-width: 980px; }
.glossary div { display: grid; grid-template-columns: 8.5rem minmax(0, 1fr); gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.glossary dt { font: 700 0.86rem/1.5 var(--mono); }
.glossary dd { margin: 0; font-size: 0.94rem; color: var(--ink-2); }
.term { border-bottom: 2px dotted var(--answer); cursor: help; border-radius: 2px; }
.term:focus-visible { outline-offset: 1px; }
.term-tip { position: absolute; z-index: 8; max-width: min(320px, calc(100vw - 32px)); background: var(--surface); color: var(--ink); border: 1px solid var(--line); box-shadow: var(--shadow); border-radius: 10px; padding: 10px 12px; font-size: 0.88rem; line-height: 1.45; }
.term-tip strong { margin-right: 4px; }

.quiz { margin: 26px 0 0; }
.quiz-lead { max-width: 68ch; }
.quiz-cards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.quiz-card { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 16px 18px; transition: border-color var(--motion); }
.quiz-card[data-verdict="right"] { border-color: var(--oracle); }
.quiz-card[data-verdict="wrong"] { border-color: var(--abstain); }
.quiz-question { margin: 0 0 10px; font-size: 1rem; }
.quiz-options { display: flex; flex-wrap: wrap; gap: 8px; }
.quiz-option { border: 1px solid var(--axis); background: var(--page); border-radius: 999px; padding: 7px 14px; font-weight: 600; font-size: 0.92rem; cursor: pointer; }
.quiz-option:hover { border-color: var(--ink); }
.quiz-option[aria-pressed="true"] { background: var(--ink); color: var(--page); border-color: var(--ink); }
.quiz-feedback { min-height: 1.5em; margin: 10px 0 0; font-size: 0.95rem; }
.quiz-card[data-verdict="right"] .quiz-feedback::before { content: "\2713\00a0"; font-weight: 700; }
.quiz-card[data-verdict="wrong"] .quiz-feedback::before { content: "\2715\00a0"; font-weight: 700; }

.walk { margin: 32px 0 0; background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 22px; box-shadow: var(--shadow); }
.walk h3.sub { margin-top: 0; }
.walk-lead { max-width: 70ch; }
.walk-controls { display: flex; align-items: center; gap: 8px; margin: 6px 0 18px; }
.walk-track { margin: 0; flex: 1; }
.walk-body { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: 24px; align-items: start; }
.walk-board { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.walk-tile { display: grid; grid-template-columns: 2.6rem 4.2rem minmax(0, 1fr); gap: 10px; align-items: center; padding: 8px 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--page); transition: background var(--motion), border-color var(--motion); }
.walk-tile .tile-bit { font: 700 0.9rem var(--mono); }
.walk-tile .tile-value { font: 700 1.05rem var(--mono); text-align: center; border-radius: 6px; padding: 2px 0; background: var(--surface-2); }
.walk-tile .tile-name { font-size: 0.84rem; color: var(--ink-2); }
.walk-tile[data-state="fact"] { border-color: var(--axis); }
.walk-tile[data-state="forced"] { border-color: var(--answer); background: var(--answer-wash); }
.walk-tile[data-state="open"] { border-color: var(--abstain); background: var(--abstain-wash); }
.walk-text { font-size: 1rem; min-height: 9em; }
.walk-text p { margin: 0 0 10px; }
.walk-text ul { margin: 0 0 10px; padding-left: 1.2em; }
.walk-text li { margin-bottom: 6px; }
.walk-text q { font-style: italic; }

.read-note { list-style: none; padding: 10px 12px; margin: 10px 0 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px 14px; font-size: 0.84rem; color: var(--ink-2); background: var(--surface-2); border-radius: 10px; max-width: 520px; }
.read-note b { color: var(--ink); margin-right: 4px; }

@media (max-width: 1100px) {
  .step-cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  .step-cards, .callouts, .glossary, .quiz-cards, .walk-body, .read-note { grid-template-columns: minmax(0, 1fr); }
  .glossary div { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .walk { padding: 16px; border-radius: 16px; }
  .walk-controls { flex-wrap: wrap; }
}