/* Blog: the tech report as one long read. Same Swiss Grid look as the other pages (hard rules, heavy type, Klein
   blue), a narrower column for prose and wider figures; each figure is drawn and animated by blog.js. */

.blog {
  --maxw: 1240px;
  --area-perception: #0e8c7f; --area-reasoning: #6c4ab6; --area-action: #002fa7;
  --area-reconstruction: #d98e04; --area-creation: #d1495b; --area-infra: #5e6472;
  --closed: #002fa7; --open: #d98e04; --muted: #5e6472; --grid: #e3e6ec; --paper: #fbfbf9;
  --col: 720px;
}

/* reading progress: a thin accent rule under the nav */
.read-progress { position: absolute; left: 0; bottom: -1.5px; height: 3px; width: 100%; background: var(--accent-1);
                 transform-origin: 0 50%; transform: scaleX(var(--p, 0)); pointer-events: none; }

/* the article and, on wide screens, a contents list that stays beside it */
.post-layout { width: min(1240px, calc(100% - 32px)); margin: 0 auto; display: grid;
               grid-template-columns: 196px minmax(0, 1fr); gap: 52px; }
.post { min-width: 0; }
.toc { position: sticky; top: 96px; align-self: start; margin-top: 136px; max-height: calc(100vh - 116px); overflow-y: auto; }
.toc-head { padding-bottom: 8px; border-bottom: 1.5px solid var(--ink); font: 500 11px var(--mono); letter-spacing: 0.08em;
            text-transform: uppercase; color: var(--ink); }
.toc-list { list-style: none; margin: 8px 0 0; padding: 0; }
.toc-list a { display: flex; gap: 8px; padding: 5px 0 5px 10px; border-left: 2px solid transparent; font-size: 13.5px;
              line-height: 1.35; color: var(--ink-3); transition: color 0.2s var(--ease), border-color 0.2s var(--ease); }
.toc-list a i { font: 500 11px/1.6 var(--mono); font-style: normal; color: var(--ink-3); }
.toc-list a:hover { color: var(--ink); }
.toc-list a.active { color: var(--ink); font-weight: 600; border-left-color: var(--accent-1); }
.toc-list a.active i { color: var(--accent-1); }
.toc-group { margin: 12px 0 2px; font: 500 10.5px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
@media (max-width: 1100px) {
  .post-layout { display: block; width: min(var(--maxw), calc(100% - 32px)); }
  .toc { display: none; }
}

/* ---------- hero ---------- */
.post-hero { padding-top: 128px; }
.post-kicker { display: flex; flex-wrap: wrap; gap: 0; font: 500 12px var(--mono); letter-spacing: 0.06em; text-transform: uppercase; }
.post-kicker span { padding: 4px 10px; border: 1.5px solid var(--ink); margin-right: -1.5px; }
.post-kicker span:first-child { background: var(--ink); color: var(--bg); }
.post-title { margin-top: 20px; max-width: 18ch; font-weight: 800; letter-spacing: -0.035em; line-height: 1.04;
              font-size: clamp(36px, 5.2vw, 62px); }
.post-title em { font-style: normal; color: var(--accent-1); }
.post-lede { margin-top: 20px; max-width: 64ch; font-size: clamp(17px, 1.4vw, 19px); line-height: 1.6; color: var(--ink-2); }
.post-links { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }

/* ---------- sections ---------- */
.post-sec { padding-top: 76px; scroll-margin-top: 84px; }
.sec-head { margin-bottom: 18px; padding-top: 14px; border-top: 1.5px solid var(--ink); }
#tldr .sec-head { border-top: 0; }
.sec-head .kicker { font: 500 12px var(--mono); letter-spacing: 0.06em; text-transform: uppercase; }
.sec-head .kicker::before { content: "■ "; color: var(--accent-1); }
.sec-head h2 { margin-top: 8px; font-weight: 750; letter-spacing: -0.022em; line-height: 1.2;
               font-size: clamp(24px, 2.5vw, 31px); max-width: 30ch; }
.prose { max-width: var(--col); }
.prose p { font-size: 17px; line-height: 1.75; color: var(--ink-2); }
.prose p + p { margin-top: 14px; }
.prose b { color: var(--ink); font-weight: 650; }
.prose em { font-style: italic; color: var(--ink); }
.prose a, figcaption a { color: var(--accent-1); border-bottom: 1.5px solid currentColor; }

/* ---------- tl;dr ---------- */
.tldr { border: 1.5px solid var(--ink); }
.tldr-head { padding: 10px 16px; border-bottom: 1.5px solid var(--ink); background: var(--ink); color: var(--bg);
             font: 500 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.tldr-lead { padding: 16px 20px; border-bottom: 1.5px solid var(--ink); font-size: 17px; line-height: 1.6; color: var(--ink-2); }
.tldr-lead b { color: var(--ink); font-weight: 700; }
.tldr-list { list-style: none; margin: 0; padding: 0; }
.tldr-list li + li { border-top: 1px solid var(--grid); }
.tldr-list a { display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 6px; padding: 14px 20px 15px; font-size: 15.5px;
               line-height: 1.6; color: var(--ink-2); transition: background 0.25s var(--ease); }
.tldr-list b { color: var(--ink); font-weight: 700; }
.tl-n { font: 800 20px/1.25 var(--sans); color: var(--accent-1); }
.tldr-list a:hover { background: rgba(0, 47, 167, 0.05); }

/* ---------- key result, lists, sub-headings ---------- */
.takeaway { max-width: var(--col); margin: 0 0 20px; padding: 12px 16px 13px 18px; border-left: 4px solid var(--accent-1);
            background: rgba(0, 47, 167, 0.05); font-size: 17px; line-height: 1.6; color: var(--ink); }
.takeaway::before { content: "Key result"; display: block; margin-bottom: 4px; font: 600 11px var(--mono); letter-spacing: 0.08em;
                    text-transform: uppercase; color: var(--accent-1); }
.takeaway b { font-weight: 700; }
.prose ul.facts, .prose ol.steps { margin: 12px 0 14px; padding-left: 22px; }
.prose ul.facts li, .prose ol.steps li { font-size: 17px; line-height: 1.7; color: var(--ink-2); }
.prose ul.facts li + li, .prose ol.steps li + li { margin-top: 8px; }
.prose ul.facts li::marker { color: var(--accent-1); }
.prose ol.steps li::marker { color: var(--accent-1); font-weight: 700; }
.prose ul + p, .prose ol + p { margin-top: 14px; }
.welcome { max-width: var(--col); margin-top: 24px; padding: 16px 20px; border: 1.5px solid var(--accent-1); background: rgba(0, 47, 167, 0.05); }
.welcome p { font-size: 17px; line-height: 1.65; color: var(--ink-2); }
.welcome b { display: block; margin-bottom: 4px; font-size: 19px; font-weight: 750; color: var(--accent-1); }
.welcome a { color: var(--accent-1); border-bottom: 1.5px solid currentColor; }
.sub { max-width: var(--col); margin: 40px 0 12px; font-size: 20px; font-weight: 700; letter-spacing: -0.01em; line-height: 1.3; }
@media (max-width: 820px) {
  .takeaway, .prose ul.facts li, .prose ol.steps li { font-size: 16px; }
  .tldr-lead, .tldr-list a { padding-left: 16px; padding-right: 16px; }
}

/* ---------- figures ---------- */
.fig { margin: 30px 0 0; border: 1.5px solid var(--ink); background: var(--paper); }
.fig-wide { margin-top: 44px; }
.fig-stage { position: relative; width: 100%; }
.fig-stage svg { display: block; width: 100%; height: auto; overflow: visible; }
.fig figcaption { padding: 12px 16px 14px; border-top: 1.5px solid var(--ink); font-size: 14px; line-height: 1.55; color: var(--ink-2); }
.fig figcaption b { color: var(--ink); }
.fig-split { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); }
.fig-split .fig-stage { border-right: 1.5px solid var(--ink); display: flex; align-items: center; }
.fig-side { padding: 20px 20px 18px; display: flex; flex-direction: column; gap: 10px; font-size: 14.5px; line-height: 1.55; color: var(--ink-2); }
.side-kicker { font: 500 11.5px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink); }
.key { display: flex; align-items: center; gap: 8px; font-size: 13.5px; }
.k-dot { display: inline-block; width: 11px; height: 11px; border-radius: 50%; }
.k-build { background: var(--accent-1); }
.k-answer { background: #a3a8b3; }
.muted-note { font-size: 13px; color: var(--ink-3); }
.replay { align-self: flex-start; margin-top: auto; padding: 5px 12px; border: 1.5px solid var(--ink); background: transparent;
          font: 500 11px var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink); cursor: pointer;
          transition: background 0.25s var(--ease), color 0.25s var(--ease); }
.replay:hover { background: var(--ink); color: var(--bg); }
@media (max-width: 820px) {
  .fig-split { grid-template-columns: 1fr; }
  .fig-split .fig-stage { border-right: 0; border-bottom: 1.5px solid var(--ink); }
}

/* group-by toolbar of the task grid */
.fig-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 0; padding: 12px 16px; border-bottom: 1.5px solid var(--ink); }
.tb-label { margin-right: 12px; font: 500 11px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-3); }
.fig-toolbar button { padding: 6px 12px; margin-right: -1.5px; border: 1.5px solid var(--ink); background: transparent; cursor: pointer;
                      font: 600 12px var(--sans); letter-spacing: 0.02em; text-transform: uppercase; color: var(--ink);
                      transition: background 0.25s var(--ease), color 0.25s var(--ease); }
.fig-toolbar button[aria-selected="true"] { background: var(--accent-1); border-color: var(--accent-1); color: #fff; position: relative; }
.fig-toolbar button:hover:not([aria-selected="true"]) { background: var(--ink); color: var(--bg); }

/* the task grid is HTML so that its tiles can move between groups */
.tasks-stage { padding: 18px 16px 20px; }
.tg-groups { position: relative; display: grid; gap: 16px; }
.tg-group { position: relative; padding-top: 26px; }
.tg-title { position: absolute; top: 0; left: 0; display: flex; gap: 8px; align-items: baseline;
            font: 700 12px var(--sans); letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink); }
.tg-title i { font: 500 11px var(--mono); font-style: normal; color: var(--ink-3); }
.tg-tiles { display: flex; flex-wrap: wrap; gap: 6px; min-height: 34px; }
.tile { position: relative; display: inline-flex; align-items: center; gap: 7px; padding: 6px 10px 6px 8px;
        border: 1.5px solid var(--c); background: #fff; font: 600 12.5px var(--sans); color: var(--ink); white-space: nowrap;
        will-change: transform; }
.tile::before { content: ""; width: 8px; height: 8px; background: var(--c); }
.tile .tg-badge { font: 500 10px var(--mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.04em; }

/* stat rows */
.fig + .prose, .stat-row + .prose, .fig + .fig, .prose + .stat-row { margin-top: 26px; }
.stat-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 26px; border: 1.5px solid var(--ink); }
.stat { padding: 14px 16px 14px; border-right: 1.5px solid var(--ink); display: flex; flex-direction: column; gap: 6px; }
.stat:last-child { border-right: 0; }
.stat b { font: 800 clamp(24px, 2.4vw, 34px)/1 var(--sans); letter-spacing: -0.035em; color: var(--accent-1); font-variant-numeric: tabular-nums; }
.stat span { font: 500 11px/1.45 var(--mono); letter-spacing: 0.05em; text-transform: uppercase; color: var(--ink-2); }
@media (max-width: 720px) {
  .stat-row { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n + 2) { border-bottom: 1.5px solid var(--ink); }
}

/* physics mini bars */
.mini-bars { display: grid; gap: 7px; margin: 4px 0 2px; }
.mb-row { display: grid; grid-template-columns: 128px minmax(0, 1fr) 44px; align-items: center; gap: 8px; font-size: 12.5px; color: var(--ink); }
.mb-track { height: 12px; background: var(--grid); position: relative; }
.mb-fill { position: absolute; inset: 0 auto 0 0; width: 0; background: var(--c); transition: width 1.1s var(--ease); }
.mb-val { font: 600 12px var(--mono); text-align: right; font-variant-numeric: tabular-nums; }

/* before / after media */
.ba-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 26px; }
.ba { margin: 0; border: 1.5px solid var(--ink); background: var(--paper); }
.ba-pair { display: grid; grid-template-columns: 1fr 1fr; }
.ba-cell { position: relative; aspect-ratio: 1 / 1; overflow: hidden; background: #e9eaec; }
.ba-cell + .ba-cell { border-left: 1.5px solid var(--ink); }
.ba-cell video { display: block; width: 100%; height: 100%; object-fit: cover; }
.ba-tag { position: absolute; left: 8px; top: 8px; padding: 2px 7px; font: 600 10.5px var(--mono); letter-spacing: 0.05em;
          text-transform: uppercase; color: #fff; background: var(--ink); }
.ba-tag.ok { background: var(--accent-1); }
.ba-tag.fail { background: #6b6f7c; }
.ba figcaption { padding: 10px 14px 12px; border-top: 1.5px solid var(--ink); font-size: 13.5px; line-height: 1.5; color: var(--ink-2); }
.ba figcaption b { color: var(--ink); }
@media (max-width: 820px) { .ba-grid { grid-template-columns: 1fr; } }

.post #citation { padding-bottom: 40px; }
.post .cite { position: relative; }

/* svg text */
/* fills set on an element win: the defaults below only apply where none is given */
.fig-stage svg { fill: var(--ink); }
.fig-stage text { font-family: var(--sans); }
.fig-stage .mono { font-family: var(--mono); }
.fig-stage .sm { font-size: 11.5px; }
.fig-stage .sm:not([fill]) { fill: var(--muted); }
.fig-stage .tick { font-size: 11px; font-family: var(--mono); }
.fig-stage .tick:not([fill]) { fill: var(--muted); }
.fig-stage .gridl { stroke: var(--grid); stroke-width: 1; }
.fig-stage .axis { stroke: var(--muted); stroke-width: 1; }

@media (max-width: 820px) {
  .post-hero { padding-top: 136px; }
  .post-sec { padding-top: 60px; }
  .prose p { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .mb-fill { transition: none; }
}