/* Calibro: scientific paper / data essay. Paper white, black ink, one deep-blue accent. */
:root {
  --paper: #fbfaf7;
  --paper-2: #f4f2ec;
  --paper-3: #ecE9e1;
  --ink: #141413;
  --ink-2: #3b3a37;
  --ink-3: #6e6b64;
  --rule: #d8d4ca;
  --rule-2: #e7e3da;
  --blue: #23395b;
  --blue-2: #3d5a85;
  --blue-wash: rgba(35, 57, 91, .07);
  --warn: #7a3b2e;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Source Sans 3", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --ease: cubic-bezier(.2, .7, .1, 1);
  --w: 1180px;
}
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--serif); font-size: 18px; line-height: 1.62; font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; overflow-x: hidden;
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }
code, .mono { font-family: var(--mono); font-size: .82em; }
.wrap { word-break: break-all; overflow-wrap: anywhere; }
.muted { color: var(--ink-3); }
.small { font-size: .86rem; }
.sc { font-variant: small-caps; letter-spacing: .04em; font-feature-settings: "smcp"; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 1px; }

/* ---------------- masthead ---------------- */
.mast { position: sticky; top: 0; z-index: 50; background: rgba(251, 250, 247, .92); backdrop-filter: saturate(1.2) blur(8px); -webkit-backdrop-filter: saturate(1.2) blur(8px); border-bottom: 1px solid var(--rule); }
.mast__in { max-width: 1440px; margin: 0 auto; padding: 0 28px; height: 62px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); flex: none; }
.brand__mark { width: 26px; height: 26px; }
.bm-frame { fill: none; stroke: var(--ink); stroke-width: 1.4; }
.bm-diag { stroke: var(--ink-3); stroke-width: 1; stroke-dasharray: 2 2; }
.bm-curve { fill: none; stroke: var(--blue); stroke-width: 1.8; }
.bm-dot { fill: var(--blue); }
.brand__name { font-family: var(--serif); font-weight: 600; font-size: 21px; letter-spacing: .01em; }
.mast__nav { display: flex; gap: 22px; margin-left: auto; font-family: var(--sans); font-size: 14.5px; }
.mast__nav a { color: var(--ink-2); text-decoration: none; position: relative; padding: 4px 0; white-space: nowrap; }
.mast__nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 1px; background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease); }
.mast__nav a:hover::after, .mast__nav a.is-cur::after { transform: scaleX(1); }
.mast__nav a.is-cur { color: var(--ink); }
.mast__right { display: flex; align-items: center; gap: 10px; flex: none; }
.mast__x { display: inline-flex; width: 34px; height: 34px; align-items: center; justify-content: center; color: var(--ink); border: 1px solid var(--rule); border-radius: 2px; }
.mast__x svg { width: 15px; height: 15px; fill: currentColor; }
.mast__menu { display: none; width: 38px; height: 36px; border: 1px solid var(--rule); background: transparent; border-radius: 2px; cursor: pointer; position: relative; }
.mm-line { position: absolute; left: 10px; right: 10px; height: 1.5px; background: var(--ink); transition: transform .3s var(--ease); }
.mm-line:nth-child(1) { top: 13px; } .mm-line:nth-child(2) { top: 21px; }
.mast__menu[aria-expanded="true"] .mm-line:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.mast__menu[aria-expanded="true"] .mm-line:nth-child(2) { transform: translateY(-4px) rotate(-45deg); }
.mast__progress { height: 2px; background: transparent; overflow: hidden; }
.mast__progress span { display: block; height: 100%; background: var(--blue); transform-origin: left; transform: scaleX(0); }

/* wallet (shared wallet.js markup) */
.wallet-slot { flex: none; }
.wb { position: relative; font-family: var(--sans); }
.wb-btn { font: 600 14px/1 var(--sans); color: var(--paper); background: var(--ink); border: 1px solid var(--ink); padding: 10px 14px; border-radius: 2px; cursor: pointer; white-space: nowrap; transition: transform .15s var(--ease), background .2s; }
.wb-btn:hover { background: var(--blue); border-color: var(--blue); }
.wb-btn:active { transform: translateY(1px) scale(.98); }
.wb-btn.is-on { background: var(--paper); color: var(--ink); border-color: var(--ink); font-family: var(--mono); font-weight: 500; font-size: 13px; }
.wb-btn.is-on::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--blue); margin-right: 8px; vertical-align: 1px; }
.wb-menu { position: absolute; right: 0; top: calc(100% + 8px); z-index: 200; width: 270px; max-width: calc(100vw - 24px); background: var(--paper); border: 1px solid var(--ink); box-shadow: 0 18px 40px -18px rgba(20, 20, 19, .35); padding: 8px; animation: menuIn .22s var(--ease); }
@keyframes menuIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }
.wb-item { display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; background: none; border: 0; border-top: 1px solid var(--rule-2); padding: 10px 8px; font: 500 14.5px var(--sans); color: var(--ink); text-decoration: none; cursor: pointer; }
.wb-item:hover { background: var(--blue-wash); color: var(--ink); }
.wb-item img { width: 18px; height: 18px; border-radius: 3px; }
.wb-addr { font-family: var(--mono); font-size: 12px; word-break: break-all; padding: 6px 8px; color: var(--ink-2); }
.wb-bal { font: 600 15px var(--sans); padding: 2px 8px 10px; color: var(--blue); }
.wb-note { font: 13px/1.45 var(--sans); color: var(--ink-3); padding: 8px; }

/* ---------------- layout primitives ---------------- */
.paper { max-width: var(--w); margin: 0 auto; padding: 0 28px; }
.paper--cols { display: grid; grid-template-columns: 70px minmax(0, 680px) minmax(0, 1fr); gap: 0 40px; }
.paper--cols > * { min-width: 0; }
.sec { padding: 104px 0; border-top: 1px solid var(--rule); position: relative; }
.sec__num { font-family: var(--serif); font-weight: 400; font-size: 54px; line-height: 1; color: var(--blue); font-feature-settings: "lnum"; padding-top: 4px; }
.sec__head { display: grid; grid-template-columns: 70px minmax(0, 1fr); gap: 0 40px; margin-bottom: 40px; }
.sec__h { font-family: var(--serif); font-weight: 500; font-size: clamp(28px, 3.4vw, 40px); line-height: 1.15; letter-spacing: -.012em; margin: 0 0 22px; max-width: 26ch; text-wrap: balance; }
.sub { font-family: var(--serif); font-weight: 600; font-size: 22px; margin: 44px 0 10px; }
.measure { max-width: 68ch; }
.lede { font-size: 21px; line-height: 1.55; color: var(--ink); }
.drop::first-letter { float: left; font-size: 4.1em; line-height: .82; padding: 8px 10px 0 0; color: var(--blue); font-weight: 500; }
p { margin: 0 0 1em; }
.margin { font-family: var(--sans); font-size: 14.5px; line-height: 1.5; color: var(--ink-2); padding-top: 70px; }
.note { border-left: 1px solid var(--rule); padding-left: 14px; margin-bottom: 26px; }
.note__n, .ref { font-family: var(--sans); font-size: 11px; font-weight: 700; color: var(--blue); vertical-align: super; margin-right: 4px; }
.ref { margin-left: 2px; }
.inl { font-style: italic; white-space: nowrap; }

/* ---------------- title page ---------------- */
.title-page { padding: 46px 0 70px; position: relative; }
.title-page::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(var(--rule-2) 1px, transparent 1px); background-size: 100% 34px; opacity: .35; pointer-events: none; mask-image: linear-gradient(180deg, #000, transparent 70%); -webkit-mask-image: linear-gradient(180deg, #000, transparent 70%); }
.journal { position: relative; display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; font-family: var(--sans); font-size: 12.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); border-top: 2px solid var(--ink); border-bottom: 1px solid var(--ink); padding: 9px 0; margin-bottom: 44px; }
.dotsep { width: 4px; height: 4px; background: var(--ink-3); border-radius: 50%; }
.title-grid { position: relative; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 56px; align-items: start; }
.title-grid > * { min-width: 0; }
.ptitle { font-family: var(--serif); font-weight: 500; font-size: clamp(42px, 6vw, 78px); line-height: 1.02; letter-spacing: -.025em; margin: 0 0 22px; text-wrap: balance; }
.psub { font-size: 21px; line-height: 1.5; color: var(--ink-2); max-width: 36ch; font-style: italic; }
.authors { font-family: var(--sans); font-size: 15px; margin: 18px 0 26px; }
.authors sup { color: var(--blue); font-weight: 700; }
.abstract { border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule); padding: 18px 0 8px; margin-bottom: 28px; font-size: 16.5px; line-height: 1.6; color: var(--ink-2); }
.abstract__h { font-family: var(--sans); font-size: 12.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink); margin: 0 0 8px; font-weight: 700; }
.kw { font-family: var(--sans); font-size: 14px; color: var(--ink-3); }
.kw .sc { color: var(--ink); margin-right: 8px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }
.coin-chip { display: inline-flex; align-items: center; gap: 10px; border: 1px solid var(--rule); padding: 6px 6px 6px 12px; margin-bottom: 24px; max-width: 100%; font-family: var(--sans); background: var(--paper); }
.coin-chip__k { font-size: 11px; font-weight: 700; letter-spacing: .12em; color: var(--blue); }
.coin-chip__v { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: 600 15px/1 var(--sans); padding: 14px 20px; border-radius: 2px; cursor: pointer; text-decoration: none; border: 1px solid var(--ink); transition: transform .15s var(--ease), background .25s, color .25s, border-color .25s; position: relative; overflow: hidden; }
.btn:active { transform: translateY(1px) scale(.985); }
.btn--ink { background: var(--ink); color: var(--paper); }
.btn--ink:hover { background: var(--blue); border-color: var(--blue); color: var(--paper); }
.btn--line { background: transparent; color: var(--ink); }
.btn--line:hover { background: var(--ink); color: var(--paper); }
.btn--sm { padding: 10px 14px; font-size: 14px; }
.btn[disabled], .btn.is-busy { opacity: .55; cursor: progress; }
.linkbtn { background: none; border: 0; padding: 0; font: inherit; color: inherit; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.copy-btn { position: relative; font: 600 12px var(--sans); border: 1px solid var(--ink); background: var(--ink); color: var(--paper); padding: 6px 10px; cursor: pointer; border-radius: 2px; min-width: 66px; overflow: hidden; }
.copy-btn__a, .copy-btn__b { display: block; transition: transform .35s var(--ease), opacity .35s; }
.copy-btn__b { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; transform: translateY(100%); opacity: 0; }
.copy-btn.is-done .copy-btn__a { transform: translateY(-100%); opacity: 0; }
.copy-btn.is-done .copy-btn__b { transform: none; opacity: 1; }

/* figures */
.fig { margin: 0; min-width: 0; }
.fig__plate { position: relative; background: #fff; border: 1px solid var(--rule); padding: 14px; box-shadow: 0 1px 0 var(--rule-2), 0 24px 50px -36px rgba(20, 20, 19, .35); }
.fig--hero .fig__plate { padding: 18px 18px 12px; }
.fig figcaption { font-family: var(--sans); font-size: 14px; line-height: 1.5; color: var(--ink-2); margin-top: 12px; max-width: 64ch; }
.fig figcaption b { color: var(--ink); font-weight: 700; }
.fig__live { position: absolute; top: 14px; right: 16px; display: flex; align-items: center; gap: 8px; font: 600 12px var(--sans); color: var(--ink-2); background: rgba(255,255,255,.9); padding: 4px 8px; border: 1px solid var(--rule-2); }
.pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--blue); position: relative; }
.pulse::after { content: ""; position: absolute; inset: -4px; border-radius: 50%; border: 1px solid var(--blue); animation: pulse 2.2s var(--ease) infinite; }
@keyframes pulse { from { transform: scale(.5); opacity: 1; } to { transform: scale(1.7); opacity: 0; } }
.chart { display: block; width: 100%; height: auto; overflow: visible; font-family: var(--sans); }
.chart .ax line, .chart .ax path { stroke: var(--ink); stroke-width: 1; fill: none; }
.chart .grid line { stroke: var(--rule-2); stroke-width: 1; }
.chart text { fill: var(--ink-2); font-size: 12px; }
.chart .ax-t { font-size: 12.5px; fill: var(--ink); font-weight: 600; }
.chart .diag { stroke: var(--ink-3); stroke-dasharray: 4 4; stroke-width: 1; }
.chart .band { fill: var(--blue-wash); }
.chart .curve { fill: none; stroke: var(--blue); stroke-width: 2.2; stroke-linejoin: round; stroke-linecap: round; }
.chart .pt { fill: #fff; stroke: var(--blue); stroke-width: 2; }
.chart .pt-in { fill: var(--blue); }
.chart .eb { stroke: var(--blue); stroke-width: 1.2; }
.chart .hist { fill: var(--ink); opacity: .14; }
.chart .lbl-blue { fill: var(--blue); font-weight: 600; }
.draw { stroke-dasharray: var(--len, 2000); stroke-dashoffset: var(--len, 2000); }
.is-drawn .draw, .draw.is-drawn { stroke-dashoffset: 0; transition: stroke-dashoffset 1.6s var(--ease); }
.pop { opacity: 0; transform: scale(.4); transform-box: fill-box; transform-origin: center; }
.is-drawn .pop { opacity: 1; transform: none; transition: opacity .5s var(--ease), transform .6s var(--ease); }
.grow { transform: scaleY(0); transform-box: fill-box; transform-origin: bottom; }
.is-drawn .grow { transform: none; transition: transform .8s var(--ease); }

/* facts */
.facts { position: relative; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 60px; border-top: 1px solid var(--ink); }
.fact { padding: 18px 20px 4px 0; border-right: 1px solid var(--rule); min-width: 0; }
.fact + .fact { padding-left: 20px; }
.fact:last-child { border-right: 0; }
.fact__n { display: block; font-family: var(--serif); font-size: 36px; line-height: 1.1; font-feature-settings: "lnum", "tnum"; color: var(--ink); transition: color .6s; }
.fact__n.flash { color: var(--blue); }
.fact__k { display: block; font-family: var(--sans); font-size: 13.5px; color: var(--ink-3); margin-top: 4px; }

/* equation */
.eq { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin: 30px 0; padding: 22px 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); font-family: var(--serif); font-size: 25px; font-style: italic; overflow-x: auto; }
.eq__body { display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; }
.eq__op { font-style: normal; margin: 0 2px; }
.eq__no { font-style: normal; font-size: 17px; color: var(--ink-3); }
.frac { display: inline-flex; flex-direction: column; align-items: center; font-size: .78em; line-height: 1.15; vertical-align: middle; }
.frac > span:first-child { border-bottom: 1px solid var(--ink); padding: 0 4px 2px; }
.frac > span:last-child { padding-top: 2px; }
.big { font-size: 1.6em; font-style: normal; line-height: 1; }
.lim { font-size: .5em; font-style: normal; margin-left: -6px; align-self: flex-end; }
.paren { font-style: normal; font-size: 1.2em; }
.scale { margin: 30px 0 0; padding-bottom: 30px; }
.scale__bar { position: relative; height: 10px; background: linear-gradient(90deg, var(--blue) 0%, var(--paper-3) 25%, var(--paper-3) 100%); border: 1px solid var(--rule); }
.scale__fill { position: absolute; left: 0; top: -1px; bottom: -1px; width: 100%; background: var(--paper); transform-origin: right; transition: transform 1.6s var(--ease); }
.is-in .scale__fill { transform: scaleX(0); }
.scale__tick { position: absolute; top: 16px; font: 12.5px var(--sans); color: var(--ink-2); white-space: nowrap; }
.scale__tick[data-v="0"] { left: 0; }
.scale__tick[data-v="0.25"] { left: 25%; transform: translateX(-50%); }
.scale__tick[data-v="1"] { right: 0; }
.scale__tick::before { content: ""; position: absolute; top: -9px; left: 50%; width: 1px; height: 7px; background: var(--ink); }
.scale__tick[data-v="0"]::before { left: 0; } .scale__tick[data-v="1"]::before { left: auto; right: 0; }

/* tools */
.tool { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0; border: 1px solid var(--ink); background: #fff; margin-top: 26px; }
.tool > * { min-width: 0; }
.tool__in { padding: 22px; border-right: 1px solid var(--rule); }
.tool__out { padding: 22px; background: var(--paper); }
.tool__row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 14px; }
.tool__msg { font: 14px var(--sans); color: var(--ink-3); margin: 8px 0 0; }
.tool__msg.is-err { color: var(--warn); }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; min-width: 0; }
.field label { font: 600 13px var(--sans); letter-spacing: .02em; color: var(--ink); display: flex; justify-content: space-between; gap: 10px; }
.field output { font-family: var(--mono); font-weight: 500; color: var(--blue); }
.field--inline { flex-direction: row; align-items: center; gap: 8px; margin: 0; }
input[type="text"], input[type="date"], textarea, select { font: 15px var(--sans); color: var(--ink); background: #fff; border: 1px solid var(--rule); border-radius: 2px; padding: 10px 12px; width: 100%; transition: border-color .2s, box-shadow .2s; min-width: 0; }
textarea { font-family: var(--mono); font-size: 13.5px; line-height: 1.55; resize: vertical; }
select { width: auto; padding-right: 30px; appearance: none; -webkit-appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--ink) 50%), linear-gradient(135deg, var(--ink) 50%, transparent 50%); background-position: calc(100% - 15px) 52%, calc(100% - 10px) 52%; background-size: 5px 5px; background-repeat: no-repeat; cursor: pointer; }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-wash); }
input[type="range"] { width: 100%; accent-color: var(--blue); }
.samples { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.samples__k { font: 600 12px var(--sans); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin-right: 4px; }
.chip { font: 500 13.5px var(--sans); border: 1px solid var(--rule); background: var(--paper); color: var(--ink); padding: 6px 10px; border-radius: 2px; cursor: pointer; transition: border-color .2s, background .2s, transform .12s; }
.chip:hover { border-color: var(--ink); }
.chip:active { transform: scale(.97); }
.chip.is-on { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.chip[disabled] { opacity: .45; cursor: not-allowed; }

/* tables */
.tbl { width: 100%; border-collapse: collapse; font-family: var(--sans); font-size: 15px; font-feature-settings: "tnum", "lnum"; }
.tbl caption { text-align: left; font-size: 13.5px; color: var(--ink-2); padding-bottom: 10px; caption-side: top; }
.tbl th, .tbl td { text-align: left; padding: 9px 10px 9px 0; border-bottom: 1px solid var(--rule-2); vertical-align: top; }
.tbl thead th { font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); border-bottom: 1px solid var(--ink); font-weight: 600; }
.tbl tbody tr:last-child th, .tbl tbody tr:last-child td { border-bottom: 1px solid var(--ink); }
.tbl tbody th { font-weight: 600; }
.tbl--score td:nth-child(2) { font-family: var(--serif); font-size: 18px; color: var(--blue); white-space: nowrap; }
.tbl--score td.muted { font-size: 13px; }
.decomp { font: 14px var(--mono); color: var(--ink-2); margin: 14px 0 0; overflow-wrap: anywhere; }
.tbl tr.flash td { animation: rowflash 1.2s var(--ease); }
@keyframes rowflash { from { background: var(--blue-wash); } to { background: transparent; } }
.shim td { padding: 12px 0; }
.shimmer { display: block; height: 14px; border-radius: 2px; background: linear-gradient(90deg, var(--paper-2) 0%, var(--paper-3) 40%, var(--paper-2) 80%); background-size: 300% 100%; animation: shim 1.4s linear infinite; }
@keyframes shim { from { background-position: 100% 0; } to { background-position: -50% 0; } }
.tag { display: inline-block; font: 700 11px var(--sans); letter-spacing: .1em; text-transform: uppercase; border: 1px solid var(--ink-3); color: var(--ink-2); padding: 2px 6px; }
.tag--live { border-color: var(--blue); color: var(--blue); }
.tag--calc { border-style: dashed; }

/* reliability */
.relgrid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 40px; align-items: start; }
.relgrid > * { min-width: 0; }
.relside { padding-top: 4px; }
.seg { position: relative; display: inline-grid; grid-auto-flow: column; grid-auto-columns: 1fr; border: 1px solid var(--ink); margin-bottom: 22px; }
.seg__b { position: relative; z-index: 1; background: none; border: 0; font: 600 13.5px var(--sans); padding: 9px 14px; cursor: pointer; color: var(--ink); transition: color .3s; }
.seg__b.is-on { color: var(--paper); }
.seg__ind { position: absolute; top: 0; bottom: 0; left: 0; background: var(--ink); width: 50%; transition: transform .4s var(--ease); z-index: 0; }
.seg[data-i="1"] .seg__ind { transform: translateX(100%); }
.tbl--bins { font-size: 14px; }
.tbl--bins td:last-child { font-family: var(--mono); font-size: 12.5px; }
.gap-pos { color: var(--blue); } .gap-neg { color: var(--warn); }
.verdict { font-family: var(--serif); font-style: italic; font-size: 18px; border-left: 2px solid var(--blue); padding-left: 14px; margin-top: 20px; color: var(--ink); }

/* lab */
.sec--lab { background: var(--paper-2); }
.labbar { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 20px; padding: 16px 0; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--rule); margin-bottom: 30px; font-family: var(--sans); }
.labbar select { background-color: #fff; }
.labbar__src { font-size: 13px; color: var(--ink-3); margin-left: auto; }
.labgrid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 40px; align-items: start; }
.labgrid > * { min-width: 0; }
.tbl--lab td, .tbl--lab th { padding-right: 8px; }
.tbl--lab td { white-space: nowrap; }
.tbl--lab td:first-child { white-space: normal; }
.sw { display: inline-block; width: 10px; height: 10px; margin-right: 8px; vertical-align: 0; border-radius: 1px; }
.rank1 td:first-child { font-weight: 700; }
.mini { display: inline-block; width: 64px; height: 22px; vertical-align: middle; }
.mini line { stroke: var(--rule); } .mini polyline { fill: none; stroke-width: 1.6; }
.nowp { font-family: var(--mono); font-size: 13px; }
.nowbar { display: inline-block; width: 46px; height: 5px; background: var(--rule-2); margin-left: 6px; vertical-align: 2px; position: relative; overflow: hidden; }
.nowbar i { position: absolute; left: 0; top: 0; bottom: 0; background: var(--blue); width: 100%; transform-origin: left; transition: transform .8s var(--ease); }
.err { font: 14px var(--sans); color: var(--warn); margin-top: 12px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.nowcard { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 20px; align-items: center; margin-top: 34px; padding: 18px 22px; background: #fff; border: 1px solid var(--rule); border-left: 3px solid var(--blue); font-family: var(--sans); }
.nowcard__k { font-size: 12px; letter-spacing: .12em; text-transform: uppercase; font-weight: 700; color: var(--blue); }
.nowcard__q { font-family: var(--serif); font-size: 19px; min-width: 0; }
.nowcard__t { font-size: 13px; color: var(--ink-3); white-space: nowrap; }
.nowcard__t b { font-family: var(--mono); font-size: 16px; color: var(--ink); font-weight: 500; margin-left: 6px; }
.defs { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 0; margin: 36px 0 0; border-top: 1px solid var(--rule); }
.defs > div { padding: 14px 16px 0 0; min-width: 0; }
.defs dt { font: 700 14px var(--sans); margin-bottom: 4px; }
.defs dd { margin: 0; font: 14px/1.45 var(--sans); color: var(--ink-2); }

/* pinned anatomy */
.pin { border-top: 1px solid var(--rule); background: var(--paper); }
.pin__track { height: 360vh; position: relative; }
.pin__stage { position: sticky; top: 64px; height: calc(100vh - 64px); display: flex; align-items: center; overflow: hidden; }
.pin__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 50px; align-items: center; width: 100%; }
.pin__grid > * { min-width: 0; }
.pin__steps { list-style: none; padding: 0; margin: 26px 0 0; counter-reset: s; }
.pin__step { position: relative; padding: 14px 0 14px 46px; border-top: 1px solid var(--rule-2); color: var(--ink-3); transition: color .4s; font-size: 17px; }
.pin__step::before { counter-increment: s; content: counter(s, lower-roman) "."; position: absolute; left: 0; top: 14px; font-style: italic; color: var(--ink-3); }
.pin__step::after { content: ""; position: absolute; left: 0; top: -1px; height: 1px; width: 100%; background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform .6s var(--ease); }
.pin__step.is-on { color: var(--ink); }
.pin__step.is-on::before { color: var(--blue); }
.pin__step.is-on::after { transform: scaleX(1); }
.pin__hint { font: 13px var(--sans); margin-top: 14px; }
.pin__fig { margin: 0; background: #fff; border: 1px solid var(--rule); padding: 14px; }
.pin__fig svg { width: 100%; height: auto; display: block; font-family: var(--sans); }
.pa-axis line { stroke: var(--ink); } .pa-axis text { font-size: 12px; fill: var(--ink-3); }
.pa-track { fill: var(--paper-2); stroke: var(--rule); }
.pa-fill { fill: var(--blue); transform-box: fill-box; transform-origin: bottom; transition: transform .9s var(--ease); }
.pa-big { font: 600 26px var(--serif); fill: var(--ink); }
.pa-big2 { font: 600 30px var(--serif); fill: var(--paper); }
.pa-mono { font: 12.5px var(--mono); fill: var(--ink-2); }
.pa-hash { fill: var(--blue); font-size: 15px; }
.pa-seal rect { fill: var(--paper); stroke: var(--ink); }
.pa-seal, .pa-out, .pa-sq, .pa-run { opacity: 0; transform: translateY(14px); transition: opacity .6s var(--ease), transform .7s var(--ease); }
.pa-hit { stroke: var(--warn); stroke-width: 4; }
.pa-sqr { fill: var(--blue); opacity: .85; transform-box: fill-box; transform-origin: bottom left; transform: scale(.2); transition: transform .9s var(--ease); }
.pa-run polyline { fill: none; stroke: var(--ink); stroke-width: 1.6; }
.pin[data-step="1"] .pa-seal, .pin[data-step="2"] .pa-seal, .pin[data-step="3"] .pa-seal { opacity: 1; transform: none; }
.pin[data-step="2"] .pa-out, .pin[data-step="3"] .pa-out { opacity: 1; transform: none; }
.pin[data-step="3"] .pa-sq, .pin[data-step="3"] .pa-run { opacity: 1; transform: none; }
.pin[data-step="3"] .pa-sqr { transform: none; }
.pin[data-step="3"] .pa-seal { opacity: .25; }

/* ensemble */
.ensgrid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 40px; align-items: start; }
.ensgrid > * { min-width: 0; }
.ensside .tbl td { font-family: var(--serif); font-size: 18px; text-align: right; color: var(--ink); }
.ensside .tbl tr.win td { color: var(--blue); font-weight: 600; }
.legend { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 18px; font: 13.5px var(--sans); color: var(--ink-2); }
.chart .area { opacity: .9; transition: d .6s; }

/* commit */
.sec--commit { background: linear-gradient(180deg, var(--paper) 0%, var(--paper-2) 100%); }
.cgrid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 26px; }
.cgrid > * { min-width: 0; }
.card { background: #fff; border: 1px solid var(--rule); padding: 24px; position: relative; }
.card::before { content: ""; position: absolute; left: -1px; top: -1px; width: 40px; height: 3px; background: var(--blue); }
.card--wide { grid-column: 1 / -1; }
.card__h { font: 700 13px var(--sans); letter-spacing: .12em; text-transform: uppercase; margin: 0 0 18px; color: var(--ink); }
.card__top { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.card__top .card__h { margin: 0; }
.frow { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
.hashbox { border-top: 1px solid var(--rule-2); padding: 10px 0; display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 12px; align-items: baseline; }
.hashbox__k { font: 600 12px var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); }
.hashbox code { color: var(--ink); }
#cHash { color: var(--blue); }
.addr-row { display: flex; gap: 8px; flex: 1 1 420px; min-width: 0; max-width: 620px; }
.addr-row input { font-family: var(--mono); font-size: 13px; }
.txres { margin-top: 14px; border: 1px solid var(--rule); background: var(--paper); padding: 12px 14px; font: 14px var(--sans); }
.txres a { word-break: break-all; }
.vout { margin-top: 14px; font: 14.5px var(--sans); }
.vrow { display: grid; grid-template-columns: 130px minmax(0, 1fr); gap: 10px; padding: 7px 0; border-bottom: 1px solid var(--rule-2); }
.vrow > span:first-child { color: var(--ink-3); font-size: 13px; }
.vrow > span:last-child { min-width: 0; overflow-wrap: anywhere; }
.ok { color: var(--blue); font-weight: 700; } .bad { color: var(--warn); font-weight: 700; }
.ledger { margin-top: 12px; }
.lrow { display: grid; grid-template-columns: 150px minmax(0, 1fr) auto; gap: 16px; align-items: center; padding: 12px 0; border-top: 1px solid var(--rule-2); font: 14px var(--sans); animation: rowin .5s var(--ease) both; }
@keyframes rowin { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.lrow__t { color: var(--ink-3); font-size: 13px; }
.lrow__m { min-width: 0; }
.lrow__m code { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--blue); }
.lrow__claim { display: block; color: var(--ink); margin-top: 2px; }
.lrow__act { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.lempty { padding: 16px 0; border-top: 1px solid var(--rule-2); color: var(--ink-3); font: 14.5px var(--sans); }
.myscore { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; border-top: 1px solid var(--ink); margin-top: 14px; padding-top: 14px; font-family: var(--sans); }
.myscore__k { font-size: 12px; letter-spacing: .12em; text-transform: uppercase; font-weight: 700; }
.myscore__v { font: 500 28px var(--serif); color: var(--blue); }

/* methods etc */
.tbl--clocks td:first-child { font-family: var(--mono); color: var(--blue); }
.rules { padding-left: 22px; margin: 30px 0 0; }
.rules li { margin-bottom: 12px; padding-left: 6px; }
.rules li::marker { font-family: var(--sans); font-weight: 700; color: var(--blue); }
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--ink); }
.step { padding: 22px 24px 0 0; border-right: 1px solid var(--rule); min-width: 0; }
.step + .step { padding-left: 24px; }
.step:last-child { border-right: 0; }
.step__n { font-family: var(--serif); font-style: italic; font-size: 30px; color: var(--blue); }
.step h3 { font: 600 20px var(--serif); margin: 6px 0 8px; }
.step p { font-size: 16px; color: var(--ink-2); }
.honest { font-size: 16px; border: 1px solid var(--rule); background: var(--paper-2); padding: 18px 20px; margin-top: 26px; }
.faq details { border-top: 1px solid var(--rule); }
.faq details:last-child { border-bottom: 1px solid var(--rule); }
.faq summary { cursor: pointer; list-style: none; padding: 18px 40px 18px 0; position: relative; font-weight: 500; font-size: 19px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; position: absolute; right: 6px; top: 50%; width: 12px; height: 12px; margin-top: -8px; border-right: 1.5px solid var(--ink); border-bottom: 1.5px solid var(--ink); transform: rotate(45deg); transition: transform .35s var(--ease); }
.faq details[open] summary::after { transform: translateY(5px) rotate(-135deg); }
.faq details p { color: var(--ink-2); font-size: 16.5px; padding-right: 30px; animation: rowin .4s var(--ease); }
.refs { font-size: 15.5px; color: var(--ink-2); padding-left: 22px; }
.refs li { margin-bottom: 8px; }
.sec--refs { padding-bottom: 80px; }

/* footer */
.foot { border-top: 2px solid var(--ink); padding: 34px 0 44px; background: var(--paper); }
.foot__in { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 16px 40px; align-items: center; }
.foot__brand { display: flex; flex-direction: column; gap: 4px; font-family: var(--sans); font-size: 14px; }
.foot__links { display: flex; flex-wrap: wrap; gap: 8px 22px; font: 14.5px var(--sans); }
.foot__links a, .foot__links button { color: var(--ink-2); text-decoration: none; }
.foot__links a:hover, .foot__links button:hover { color: var(--blue); }
.foot__note { grid-column: 1 / -1; margin: 0; border-top: 1px solid var(--rule); padding-top: 14px; }

/* review sheet */
.sheet { position: fixed; inset: 0; z-index: 300; background: rgba(20, 20, 19, .42); display: flex; align-items: center; justify-content: center; padding: 16px; animation: fade .25s var(--ease); }
@keyframes fade { from { opacity: 0; } }
.sheet__card { background: var(--paper); border: 1px solid var(--ink); max-width: 520px; width: 100%; padding: 26px; max-height: calc(100vh - 32px); overflow: auto; animation: rise .35s var(--ease); }
@keyframes rise { from { transform: translateY(16px); opacity: 0; } }
.sheet__card h3 { font: 600 24px var(--serif); margin: 0 0 16px; }
.sheet__dl { margin: 0; font-family: var(--sans); font-size: 14.5px; }
.sheet__dl > div { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 12px; padding: 9px 0; border-top: 1px solid var(--rule-2); }
.sheet__dl dt { color: var(--ink-3); }
.sheet__dl dd { margin: 0; min-width: 0; }

/* ---------------- motion: load + reveal ---------------- */
.split .w { display: inline-block; overflow: hidden; vertical-align: bottom; padding-bottom: .06em; margin-bottom: -.06em; }
.split .wi { display: inline-block; transform: translateY(105%); transition: transform .9s var(--ease); transition-delay: calc(var(--i) * 70ms + 120ms); }
.is-ready .split .wi { transform: none; }
.reveal-load { opacity: 0; transform: translateY(14px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal-load[data-d="1"] { transition-delay: .55s; } .reveal-load[data-d="2"] { transition-delay: .75s; }
.reveal-load[data-d="3"] { transition-delay: .95s; } .reveal-load[data-d="4"] { transition-delay: 1.15s; }
.is-ready .reveal-load { opacity: 1; transform: none; }
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .split .wi, .reveal-load, .reveal { transform: none !important; opacity: 1 !important; transition: none !important; }
  .draw { stroke-dashoffset: 0 !important; transition: none !important; }
  .pop, .grow { opacity: 1 !important; transform: none !important; transition: none !important; }
  .scale__fill { transform: scaleX(0) !important; transition: none !important; }
  .pulse::after, .shimmer { animation: none; }
  .pin__track { height: auto; } .pin__stage { position: relative; top: 0; height: auto; padding: 90px 0; }
}

/* ---------------- responsive ---------------- */
@media (max-width: 1100px) {
  .mast__nav { gap: 16px; font-size: 14px; }
  .mast__nav a:nth-child(n+6) { display: none; }
  .paper--cols { grid-template-columns: 60px minmax(0, 1fr); }
  .paper--cols .margin { grid-column: 2; padding-top: 10px; display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; }
  .defs { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  body { font-size: 17px; }
  .mast__in { padding: 0 16px; gap: 12px; }
  .mast__menu { display: block; }
  .mast__nav { position: fixed; top: 64px; left: 0; right: 0; flex-direction: column; gap: 0; background: var(--paper); border-bottom: 1px solid var(--ink); padding: 8px 16px 18px; transform: translateY(-8px); opacity: 0; pointer-events: none; transition: opacity .25s var(--ease), transform .3s var(--ease); margin: 0; }
  .mast__nav.is-open { opacity: 1; transform: none; pointer-events: auto; }
  .mast__nav a, .mast__nav a:nth-child(n+6) { display: block; padding: 13px 0; border-bottom: 1px solid var(--rule-2); font-size: 16px; }
  .mast__right { margin-left: auto; }
  .paper { padding: 0 16px; }
  .title-grid, .relgrid, .labgrid, .ensgrid, .cgrid, .pin__grid { grid-template-columns: minmax(0, 1fr); gap: 34px; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fact:nth-child(2) { border-right: 0; }
  .fact:nth-child(3) { padding-left: 0; }
  .fact:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .tool { grid-template-columns: minmax(0, 1fr); }
  .tool__in { border-right: 0; border-bottom: 1px solid var(--rule); }
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step:nth-child(2) { border-right: 0; }
  .step:nth-child(3) { padding-left: 0; }
  .pin__stage { top: 62px; height: calc(100vh - 62px); }
  .pin__grid { gap: 18px; }
  .pin__fig { max-width: 440px; }
  .pin__step { font-size: 15.5px; padding: 9px 0 9px 36px; }
  .pin__step::before { top: 9px; }
  .pin .sec__h { font-size: 26px; margin-bottom: 8px; }
  .pin__hint { display: none; }
  .sec { padding: 72px 0; }
}
@media (max-width: 640px) {
  .paper--cols, .sec__head { grid-template-columns: minmax(0, 1fr); }
  .paper--cols .margin { grid-column: 1; grid-template-columns: 1fr; }
  .sec__num { font-size: 40px; margin-bottom: 12px; }
  .ptitle { font-size: 42px; }
  .psub, .lede { font-size: 18px; }
  .journal { font-size: 11px; letter-spacing: .08em; margin-bottom: 28px; }
  .eq { font-size: 19px; }
  .fact__n { font-size: 28px; }
  .fact, .fact + .fact { padding: 14px 10px 4px 0; }
  .fact:nth-child(even) { padding-left: 12px; }
  .defs { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .frow { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .hashbox { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .lrow { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .lrow__act { justify-content: flex-start; }
  .nowcard { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .labbar__src { margin-left: 0; width: 100%; }
  .steps { grid-template-columns: minmax(0, 1fr); }
  .step, .step + .step { padding: 18px 0 8px; border-right: 0; border-bottom: 1px solid var(--rule); }
  .tbl--lab th:nth-child(5), .tbl--lab td:nth-child(5), .tbl--lab th:nth-child(3), .tbl--lab td:nth-child(3) { display: none; }
  .vrow { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .sheet__dl > div { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .foot__in { grid-template-columns: minmax(0, 1fr); }
  .wb-btn { padding: 9px 11px; font-size: 13px; }
  .brand__name { font-size: 19px; }
  .addr-row { flex-basis: 100%; }
  .card { padding: 18px; }
}

/* §2 wide tool + notes row, hero tape */
.sec--tool .tool { margin-top: 0; }
.notes-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0 40px; margin-top: 28px; font-family: var(--sans); font-size: 14.5px; line-height: 1.5; color: var(--ink-2); }
.sec--tool .tool { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); }
.tape { display: flex; align-items: baseline; gap: 12px; margin-top: 10px; padding: 9px 12px; border: 1px solid var(--rule); border-top: 0; background: var(--paper-2); font-family: var(--sans); font-size: 13.5px; min-height: 40px; overflow: hidden; }
.tape__k { flex: none; font-size: 11px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--blue); }
.tape__v { position: relative; flex: 1; min-width: 0; color: var(--ink-2); font-feature-settings: "tnum"; }
.tape__v .shimmer { width: 70%; }
.tape__item { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; animation: tapeIn .6s var(--ease) both; }
.tape__item b { color: var(--ink); font-weight: 600; }
.tape__up { color: var(--blue); } .tape__dn { color: var(--warn); }
@keyframes tapeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.fig--hero .fig__plate { border-bottom-width: 1px; }
@media (max-width: 900px) { .notes-row { grid-template-columns: minmax(0, 1fr); } .sec--tool .tool { grid-template-columns: minmax(0, 1fr); } .tape__k { display: none; } }
@media (prefers-reduced-motion: reduce) { .tape__item { animation: none; } }
.eq__body { display: inline-block; white-space: nowrap; line-height: 1.2; }
.eq__body sub, .eq__body sup { font-size: .6em; font-style: italic; }
.big { vertical-align: middle; display: inline-block; }
.lim { margin-left: 0; }
@media (max-width: 900px) {
  .title-col { display: contents; }
  .title-grid { gap: 0; }
  .title-grid .ptitle { order: 1; } .title-grid .psub { order: 2; } .title-grid .fig--hero { order: 3; margin: 18px 0 8px; }
  .title-grid .authors { order: 4; } .title-grid .coin-chip { order: 5; } .title-grid .abstract { order: 6; } .title-grid .cta { order: 7; }
}
@media (max-width: 640px) { .scale__tick[data-v="0.25"] { top: 32px; } .scale { padding-bottom: 46px; } }