/* eval-harness site — editorial, dark-first, no external requests. */
:root {
  color-scheme: dark;
  --page: #0b0b0a;
  --surface: #141413;
  --surface-2: #1c1c1a;
  --ink: #f0efec;
  --ink-2: #b9b7ad;
  --muted: #7d7b74;
  --hair: #2a2a27;
  --axis: #3a3a36;
  --accent: #c8ff3d;          /* editorial highlight, never data */
  --accent-ink: #0b0b0a;
  --proprietary: #3987e5;     /* categorical slot 1, dark step */
  --local: #d95926;           /* slot 2 */
  --open: #199e70;            /* slot 3 */
  --baseline: #6f6d66;
  --band: rgba(200, 255, 61, 0.09);
  --display: "Inter Tight", "Inter", "Helvetica Neue", system-ui, -apple-system, "Segoe UI", sans-serif;
  --text: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --page: #f6f5f1; --surface: #fcfcfb; --surface-2: #efeee9;
    --ink: #0b0b0b; --ink-2: #4a4945; --muted: #7a7872; --hair: #dddbd3; --axis: #c3c2b7;
    --accent: #3d5c00; --accent-ink: #f6f5f1;
    --proprietary: #2a78d6; --local: #eb6834; --open: #1baf7a; --baseline: #9a988f;
    --band: rgba(61, 92, 0, 0.16);
  }
}
:root[data-theme="light"] {
  color-scheme: light;
  --page: #f6f5f1; --surface: #fcfcfb; --surface-2: #efeee9;
  --ink: #0b0b0b; --ink-2: #4a4945; --muted: #7a7872; --hair: #dddbd3; --axis: #c3c2b7;
  --accent: #3d5c00; --accent-ink: #f6f5f1;
  --proprietary: #2a78d6; --local: #eb6834; --open: #1baf7a; --baseline: #9a988f;
  --band: rgba(61, 92, 0, 0.16);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--page); color: var(--ink);
  font: 400 17px/1.6 var(--text); -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration-color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 640px) { .wrap { padding: 0 16px; } body { font-size: 16px; } }

/* ── top bar ───────────────────────────────────────────── */
.bar { position: sticky; top: 0; z-index: 10; backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--page) 78%, transparent); border-bottom: 1px solid var(--hair); }
.bar .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; gap: 16px; }
.brand { font: 600 14px/1 var(--mono); letter-spacing: .04em; text-decoration: none; display: flex; gap: 10px; align-items: center; }
.brand .mark { width: 28px; height: 28px; flex: none; display: block; }
.nav { display: flex; gap: 22px; font: 500 13px/1 var(--mono); letter-spacing: .03em; }
.nav a { text-decoration: none; color: var(--ink-2); }
.nav a:hover { color: var(--accent); }
.nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; text-decoration-color: var(--accent); text-decoration-thickness: 2px; text-underline-offset: 6px; }
@media (max-width: 760px) { .nav .hide-sm { display: none; } }

/* theme toggle */
.theme { background: none; border: 1px solid var(--hair); color: var(--ink-2); width: 30px; height: 30px; border-radius: 50%; cursor: pointer; font-size: 14px; line-height: 1; }
.theme:hover { color: var(--accent); border-color: var(--accent); }
.nav { align-items: center; }

/* ── hero ──────────────────────────────────────────────── */
.hero { position: relative; padding: 120px 0 72px; overflow: hidden; border-bottom: 1px solid var(--hair); }
.hero::before { content: ""; position: absolute; inset: -40% -10% auto auto; width: 70vw; height: 70vw;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%);
  pointer-events: none; }
.kicker { font: 500 12px/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-2); }
.kicker b { color: var(--accent); font-weight: 600; }
h1, h2, h3 { font-family: var(--display); letter-spacing: -0.035em; margin: 0; }
.hero h1 { font-size: clamp(48px, 9vw, 128px); line-height: .92; font-weight: 800; margin: 28px 0 32px; max-width: 13ch; }
.hero h1 em { font-style: normal; color: var(--accent); }
.dek { font-size: clamp(18px, 2vw, 22px); line-height: 1.5; color: var(--ink-2); max-width: 60ch; margin: 0; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: 72px; border-top: 1px solid var(--hair); }
.stat { padding: 22px 20px 0 0; border-right: 1px solid var(--hair); margin-right: 20px; }
.stat:last-child { border-right: 0; }
.stat .n { font: 700 clamp(36px, 5vw, 60px)/1 var(--display); letter-spacing: -0.04em; }
.stat .n small { font-size: .45em; color: var(--muted); letter-spacing: 0; }
.stat .l { margin-top: 10px; font-size: 14px; color: var(--ink-2); line-height: 1.45; }
@media (max-width: 760px) { .stats { grid-template-columns: 1fr 1fr; } .stat:nth-child(2) { border-right: 0; } .stat { padding-bottom: 20px; } }

/* ── sections ──────────────────────────────────────────── */
section.block { padding: 112px 0; border-bottom: 1px solid var(--hair); }
.eyebrow { display: flex; align-items: baseline; gap: 14px; font: 500 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.eyebrow .num { color: var(--accent); font-weight: 700; font-size: 13px; }
section.block h2 { font-size: clamp(36px, 5.6vw, 76px); line-height: .98; font-weight: 800; margin: 22px 0 28px; max-width: 16ch; }
.lede { font-size: clamp(18px, 1.8vw, 21px); color: var(--ink-2); max-width: 62ch; margin: 0 0 48px; }
.prose { max-width: 66ch; }
.prose p { margin: 0 0 18px; color: var(--ink-2); }
.prose p strong, .lede strong { color: var(--ink); font-weight: 600; }
.cols { display: grid; grid-template-columns: 1.15fr 1fr; gap: 64px; align-items: start; }
@media (max-width: 900px) { .cols { grid-template-columns: 1fr; gap: 32px; } }
.note { border-left: 2px solid var(--accent); padding: 4px 0 4px 18px; color: var(--ink-2); font-size: 15px; max-width: 66ch; }
.note b { color: var(--ink); }

/* ── charts ────────────────────────────────────────────── */
figure { margin: 0; }
.chart { background: var(--surface); border: 1px solid var(--hair); border-radius: 14px; padding: 22px 22px 14px; }
.chart svg { width: 100%; height: auto; display: block; overflow: visible; }
.chart svg text { font-family: var(--mono); fill: var(--ink-2); }
.chart svg .t-muted { fill: var(--muted); }
.chart svg .t-ink { fill: var(--ink); paint-order: stroke; stroke: var(--surface); stroke-width: 4px; stroke-linejoin: round; }
.chart svg .t-head { font-family: var(--display); font-weight: 700; fill: var(--ink); letter-spacing: -0.01em; }
.chart svg .grid { stroke: var(--hair); stroke-width: 1; }
.chart svg .axis { stroke: var(--axis); stroke-width: 1; }
.chart svg .band { fill: var(--band); }
.chart svg .accent { fill: var(--accent); }
.chart svg .k-proprietary { fill: var(--proprietary); }
.chart svg .k-open { fill: var(--open); }
.chart svg .k-local { fill: var(--local); }
.chart svg .k-baseline { fill: var(--baseline); }
.chart svg .s-proprietary { stroke: var(--proprietary); }
.chart svg .s-open { stroke: var(--open); }
.chart svg .s-local { stroke: var(--local); }
.chart svg .s-baseline { stroke: var(--baseline); }
.chart svg .dot { stroke: var(--surface); stroke-width: 2; }
.chart svg .ring { fill: none; stroke: var(--ink); stroke-width: 1.5; }
.chart svg [data-tip] { cursor: default; }
.chart svg [data-tip]:hover { opacity: .85; }
figcaption { margin-top: 14px; font-size: 13px; color: var(--muted); line-height: 1.5; max-width: 80ch; }
.legend { display: flex; flex-wrap: wrap; gap: 18px; margin: 0 0 14px; font: 500 12px/1 var(--mono); color: var(--ink-2); }
.legend span { display: inline-flex; align-items: center; gap: 7px; }
.legend i { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.legend .read { margin-left: auto; color: var(--muted); }
.legend .sw-band { width: 16px; height: 10px; border-radius: 2px; background: var(--band); outline: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); }
#tip { position: fixed; pointer-events: none; z-index: 50; background: var(--ink); color: var(--page);
  font: 500 12px/1.4 var(--mono); padding: 7px 9px; border-radius: 6px; opacity: 0; transform: translateY(4px);
  transition: opacity .12s, transform .12s; max-width: 280px; white-space: pre-line; }
#tip.on { opacity: 1; transform: none; }

/* ── tables ────────────────────────────────────────────── */
table.data { width: 100%; border-collapse: collapse; font-size: 15px; }
table.data th { text-align: left; font: 500 11px/1.3 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); padding: 0 12px 12px 0; border-bottom: 1px solid var(--hair); }
table.data td { padding: 14px 12px 14px 0; border-bottom: 1px solid var(--hair); vertical-align: top; }
table.data td.num { font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
table.data td.big { font: 700 22px/1 var(--display); letter-spacing: -0.02em; }
.scroll-x { overflow-x: auto; }

/* ── finding list ──────────────────────────────────────── */
.findings { list-style: none; padding: 0; margin: 0; counter-reset: f; display: grid; gap: 0; }
.findings li { counter-increment: f; display: grid; grid-template-columns: 56px 1fr; gap: 16px; padding: 22px 0; border-top: 1px solid var(--hair); }
.findings li::before { content: counter(f, decimal-leading-zero); font: 700 13px/1.8 var(--mono); color: var(--accent); }
.findings h3 { font-size: 22px; line-height: 1.25; margin: 0 0 6px; letter-spacing: -0.02em; }
.findings p { margin: 0; color: var(--ink-2); }

/* ── experiment cards ──────────────────────────────────── */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr)); gap: 16px; }
.card { display: flex; flex-direction: column; gap: 14px; padding: 26px; border: 1px solid var(--hair); border-radius: 14px; background: var(--surface); text-decoration: none; transition: border-color .15s, transform .15s; min-height: 280px; }
.card:hover { border-color: var(--accent); transform: translateY(-2px); color: inherit; }
.card .task { font: 500 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.card h3 { font-size: 30px; line-height: 1.02; font-weight: 800; }
.card p { margin: 0; color: var(--ink-2); font-size: 15px; flex: 1; }
.card .meta { display: flex; justify-content: space-between; font: 500 12px/1.3 var(--mono); color: var(--ink-2); border-top: 1px solid var(--hair); padding-top: 14px; }
.card .meta b { color: var(--accent); font-weight: 600; }

/* ── facts grid (experiment pages) ─────────────────────── */
.facts { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--hair); margin-top: 56px; }
.fact { padding: 20px 20px 22px 0; border-bottom: 1px solid var(--hair); }
.fact .k { font: 500 11px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.fact .v { font-size: 16px; color: var(--ink); line-height: 1.45; }
@media (max-width: 760px) { .facts { grid-template-columns: 1fr; } }
.btns { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.btn { font: 600 13px/1 var(--mono); letter-spacing: .03em; padding: 14px 18px; border-radius: 999px; border: 1px solid var(--hair); text-decoration: none; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { color: var(--accent-ink); filter: brightness(1.06); }

/* ── footer ────────────────────────────────────────────── */
footer { padding: 64px 0 80px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; }
footer a { color: var(--ink-2); }

/* ── reveal ────────────────────────────────────────────── */
.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .reveal { opacity: 1; transform: none; transition: none; } html { scroll-behavior: auto; } }

/* ── reproduce: the ladder and a terminal ───────────────── */
.ladder { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; counter-reset: lvl; }
.ladder li { display: grid; grid-template-columns: 56px 1fr auto; gap: 16px; align-items: baseline;
  padding: 18px 0; border-bottom: 1px solid var(--hair); }
.ladder li:first-child { border-top: 1px solid var(--hair); }
.ladder .lvl { font: 500 12px/1 var(--mono); letter-spacing: .12em; color: var(--accent); }
.ladder h3 { font-size: 19px; margin: 0 0 4px; }
.ladder p { margin: 0; color: var(--ink-2); font-size: 15px; }
.ladder .cost { font: 500 13px/1.3 var(--mono); color: var(--muted); text-align: right; white-space: nowrap; }
pre.term { background: var(--panel, rgba(127,127,127,.08)); border: 1px solid var(--hair); border-radius: 6px;
  padding: 18px 20px; margin: 0; overflow-x: auto; font: 13.5px/1.7 var(--mono); color: var(--ink); }
pre.term .c { color: var(--muted); }
pre.term .p { color: var(--accent); user-select: none; }
@media (max-width: 600px) { .ladder li { grid-template-columns: 40px 1fr; } .ladder .cost { grid-column: 2; text-align: left; } }

/* ── the lifecycle diagram ─────────────────────────────── */
svg.lc { width: 100%; max-width: 320px; height: auto; display: block; overflow: visible; }
.lc rect { fill: var(--surface); stroke: var(--hair); stroke-width: 1; transition: fill .25s, stroke .25s; }
.lc .lc-label { font: 700 16px var(--display); fill: var(--ink); letter-spacing: -0.01em; }
.lc .lc-sub { font: 500 10.5px var(--mono); fill: var(--muted); letter-spacing: .04em; }
.lc .lc-num { font: 600 11px var(--mono); fill: var(--muted); }
.lc .lc-edge { stroke: var(--axis); stroke-width: 1.5; fill: none; }
.lc .lc-head { stroke: var(--axis); stroke-width: 1.5; fill: none; stroke-linecap: round; }
.lc .lc-node.on rect { fill: color-mix(in srgb, var(--accent) 14%, var(--surface)); stroke: var(--accent); stroke-width: 1.5; }
.lc .lc-node.on .lc-num { fill: var(--accent); }
.lc a.lc-node { cursor: pointer; }
.lc a.lc-node:focus { outline: none; }
.lc a.lc-node:focus rect { stroke: var(--accent); stroke-width: 2; }

/* ── method page ───────────────────────────────────────── */
.toc { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 56px; border-top: 1px solid var(--hair); }
.toc a { display: flex; gap: 12px; padding: 16px 16px 16px 0; border-bottom: 1px solid var(--hair); text-decoration: none; font-size: 16px; color: var(--ink-2); }
.toc a span { font: 600 12px/1.9 var(--mono); color: var(--accent); }
.toc a:hover { color: var(--ink); }
@media (max-width: 760px) { .toc { grid-template-columns: 1fr; } }
section.method { padding-top: 64px; }
.method-grid { display: grid; grid-template-columns: 300px 1fr; gap: 72px; align-items: start; }
.method-aside .sticky { position: sticky; top: 88px; }
.aside-note { font-size: 13px; color: var(--muted); margin-top: 14px; max-width: 30ch; }
.chapter { padding: 56px 0 72px; border-top: 1px solid var(--hair); scroll-margin-top: 72px; }
.chapter:first-child { border-top: 0; padding-top: 8px; }
.chapter h2 { font-size: clamp(34px, 4.6vw, 60px); line-height: 1; font-weight: 800; margin: 18px 0 26px; max-width: 18ch; }
.habit { margin: 28px 0 22px; padding: 18px 22px; border-left: 3px solid var(--accent); background: var(--surface); font-size: 18px; line-height: 1.5; max-width: 66ch; }
.habit b { display: block; font: 600 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); margin-bottom: 10px; }
.tool { max-width: 66ch; }
.tool .k { display: block; font: 500 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.yours { margin: 22px 0 0; color: var(--ink); max-width: 66ch; }
.yours b { font: 600 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--accent); margin-right: 8px; }
.reading { list-style: none; margin: 0; padding: 0; }
.reading li { padding: 16px 0; border-top: 1px solid var(--hair); color: var(--ink-2); font-size: 15px; }
.reading li b { color: var(--ink); font-weight: 600; }
@media (max-width: 900px) {
  .method-grid { grid-template-columns: 1fr; gap: 24px; }
  .method-aside .sticky { position: static; }
  .method-aside svg.lc { max-width: 240px; }
}

/* ── use page ──────────────────────────────────────────── */
.lc-explorer { display: grid; grid-template-columns: 320px 1fr; gap: 56px; align-items: start; }
.lc-panel { padding: 22px 0; border-top: 1px solid var(--hair); }
.lc-panel p { color: var(--ink-2); margin: 12px 0; max-width: 60ch; }
.lc-where { font: 500 13px/1.5 var(--mono); color: var(--ink-2); margin-bottom: 14px; }
.lc-where span { color: var(--muted); text-transform: uppercase; letter-spacing: .12em; font-size: 11px; margin-right: 6px; }
.lc-more { display: inline-block; margin-top: 12px; font: 600 13px/1 var(--mono); text-decoration: none; color: var(--accent); }
.lc-explorer.live .lc-panel { display: none; }
.lc-explorer.live .lc-panel.on { display: block; border-top: 0; padding-top: 4px; position: sticky; top: 88px; }
.lc-explorer.live .lc-panel.on .eyebrow { font-size: 14px; }
@media (max-width: 900px) { .lc-explorer { grid-template-columns: 1fr; gap: 24px; } .lc-explorer.live .lc-panel.on { position: static; } }
.patterns { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 16px; }
.pattern { display: flex; flex-direction: column; gap: 12px; padding: 24px; border: 1px solid var(--hair); border-radius: 14px; background: var(--surface); }
.pattern .task { font: 500 11px/1.3 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
.pattern h3 { font-size: 23px; line-height: 1.1; font-weight: 800; }
.pattern p { margin: 0; color: var(--ink-2); font-size: 15px; flex: 1; }
.pattern .meta { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; font: 500 12px/1.4 var(--mono); color: var(--muted); border-top: 1px solid var(--hair); padding-top: 12px; }
.pattern .meta a { color: var(--ink-2); text-decoration: none; }
.pattern .meta a:hover { color: var(--accent); }
.steps li > div { min-width: 0; }
.steps pre.term { margin-top: 14px; }
.steps p a { color: var(--accent); text-decoration: none; font: 600 13px var(--mono); margin-left: 4px; }
.byo { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--hair); }
.byo-col { padding: 28px 28px 8px 0; }
.byo-col + .byo-col { padding-left: 28px; border-left: 1px solid var(--hair); }
.byo-col h3 { font-size: 24px; margin-bottom: 18px; }
.byo-col ul { list-style: none; margin: 0; padding: 0; }
.byo-col li { padding: 10px 0; border-top: 1px solid var(--hair); color: var(--ink-2); font-size: 15px; }
.byo-col li b { color: var(--ink); }
.byo-col.check li { padding-left: 28px; position: relative; }
.byo-col.check li::before { content: ""; position: absolute; left: 0; top: 13px; width: 14px; height: 14px; border: 1.5px solid var(--accent); border-radius: 3px; }
@media (max-width: 900px) { .byo { grid-template-columns: 1fr; } .byo-col + .byo-col { padding-left: 0; border-left: 0; border-top: 1px solid var(--hair); } }
.doors .card { min-height: 240px; }

/* ── landing teaser + experiment lesson ────────────────── */
.habits { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--hair); border-left: 1px solid var(--hair); }
.habit-card { display: flex; flex-direction: column; gap: 8px; padding: 24px 24px 28px; border-right: 1px solid var(--hair); border-bottom: 1px solid var(--hair); text-decoration: none; transition: background .15s; }
.habit-card:hover { background: var(--surface); color: inherit; }
.habit-card .n { font: 600 12px/1 var(--mono); color: var(--accent); }
.habit-card b { font: 800 22px/1.1 var(--display); letter-spacing: -0.02em; color: var(--ink); }
.habit-card span:last-child { color: var(--ink-2); font-size: 15px; }
@media (max-width: 900px) { .habits { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .habits { grid-template-columns: 1fr; } }
.lesson { max-width: 70ch; }
.lesson h2 { font-size: clamp(32px, 4.4vw, 56px) !important; }
.lesson p { font-size: 19px; color: var(--ink-2); margin: 0 0 8px; }
.nav a, .brand { white-space: nowrap; }
@media (max-width: 760px) { .nav { gap: 14px; } }
@media (max-width: 420px) { .nav { gap: 10px; font-size: 12px; } .brand { gap: 7px; font-size: 13px; } }
.method-grid > *, .lc-explorer > *, .cols > *, .byo > *, .findings li > * { min-width: 0; }

/* ── the ties table: cards on narrow screens ────────────── */
.chart figcaption b { color: var(--ink-2); font-weight: 600; }
@media (max-width: 700px) {
  .chart.scroll-x:has(table.ties) { overflow-x: visible; }
  table.data.ties thead { display: none; }
  table.data.ties, table.data.ties tbody { display: block; }
  table.data.ties tr { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 16px; padding: 18px 0;
    border-bottom: 1px solid var(--hair); }
  table.data.ties td { display: flex; flex-direction: column; gap: 4px; padding: 0; border: 0; white-space: normal; }
  table.data.ties td.exp { grid-column: 1 / -1; font-size: 17px; font-weight: 600; }
  table.data.ties td[data-label]::before { content: attr(data-label); font: 500 10.5px/1.2 var(--mono);
    letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
  table.data.ties td.big { font-size: 26px; }
}

/* charts: a phone layout of each, swapped in under 700px */
.vn { display: none; }
@media (max-width: 700px) { .vw { display: none; } .vn { display: block; } .chart { padding: 16px 14px 12px; } }

/* phones: tighter rhythm, so a screen holds a finding rather than whitespace */
@media (max-width: 640px) {
  .hero { padding: 56px 0 40px; }
  .hero h1 { margin: 18px 0 22px; }
  section.block { padding: 60px 0; }
  .findings li { grid-template-columns: 1fr; gap: 4px; padding: 18px 0; }
  .findings h3 { font-size: 20px; }
}

/* phones, round two: touch targets, the narrowest screens, density */
.chart svg .hit { fill: transparent; }
@media (max-width: 400px) { .nav { gap: 2px; font-size: 12px; letter-spacing: 0; } .nav a { padding-left: 4px; padding-right: 4px; } .theme { width: 34px; height: 34px; margin-left: 4px; } .bar .wrap { gap: 6px; } .brand { font-size: 13px; gap: 6px; } }
@media (max-width: 640px) {
  .nav a { padding: 14px 4px; }
  .theme { width: 38px; height: 38px; font-size: 17px; }
  .hero .dek { font-size: 17px; }
  .stats { margin-top: 36px; }
  .facts { grid-template-columns: 1fr 1fr; grid-auto-flow: row dense; }
  .facts .fact:nth-child(1), .facts .fact:nth-child(3), .facts .fact:nth-child(4), .facts .fact:nth-child(5) { grid-column: 1 / -1; }
  pre.term { font-size: 12.5px; padding: 14px; white-space: pre-wrap; overflow-wrap: anywhere; }
  .card { min-height: 0; padding: 20px; }
  .doors .card { min-height: 0; }
  .habit-card { padding: 16px 18px 18px; }
  .card .task, .pattern .task, .fact .k, .tool .k, .habit b, .yours b { font-size: 12px; }
  .byo-col { padding-right: 0; }
  .pattern .meta { flex-direction: column; align-items: flex-start; gap: 4px; }
  .legend { gap: 10px 14px; font-size: 11.5px; }
  .lesson .btn { margin-top: 20px; }
}
@media (max-width: 900px) { .method-aside { display: none; } }
@media (max-width: 400px) { .brand span { display: none; } }
@media (max-width: 340px) { .nav { font-size: 11px; } .nav a { padding-left: 2px; padding-right: 2px; } .theme { width: 30px; height: 30px; } }

/* homepage: why it exists -- question, what the harness gives, what it found */
.why { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.why-q { display: flex; flex-direction: column; gap: 12px; padding: 26px; border: 1px solid var(--hair); border-radius: 14px; background: var(--surface); }
.why-q .n { font: 600 12px/1 var(--mono); color: var(--accent); }
.why-q h3 { font-size: 22px; line-height: 1.2; letter-spacing: -0.02em; margin: 0; }
.why-q p { margin: 0; color: var(--ink-2); font-size: 15.5px; }
.why-q p b { display: block; font: 600 11px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
.why-q a { margin-top: auto; font: 500 13px/1 var(--mono); color: var(--accent); text-decoration: none; padding-top: 6px; }
@media (max-width: 760px) { .why { grid-template-columns: 1fr; } .why-q { padding: 20px; } .why-q h3 { font-size: 20px; } .why-q p b { font-size: 12px; } }

/* who built this: closing section on the main pages, and the footer credit */
section.author h2 { max-width: 20ch; }
footer .made { flex-basis: 100%; padding-top: 18px; border-top: 1px solid var(--hair); }
footer .made a { color: var(--ink); text-decoration-color: var(--accent); text-underline-offset: 3px; }
.kicker a.byline { color: inherit; text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: 3px; }