/* =====================================================================
   Rubikn · article family restyle (rubikn-legacy-articles.css)
   ---------------------------------------------------------------------
   Loaded only by the 33 articles (every /post/<slug>/ page) and the two article listings
   (/blog/, /blog/page/2/), on the line after the rk-frame:family-css hook,
   so it comes after styles.css, article.css / blog-listing.css,
   rubikn-frame.css and rubikn-legacy.css.

   It moves the old "intelligence dossier" article template onto the new
   pages' look (How it works, Home, About Abdullah, How I use your details):
   Geist 18 px body, H1 in Geist 500 up to 66 px, Instrument Serif italic
   only as the accent inside headings, one left-aligned reading column at a
   46ch measure, 8-point spacing, paper / ink / cobalt, 16 px minimum text,
   44 px targets, quiet sentence-case labels.

   CSS only: no text, link or markup changes. The only things hidden are
   aria-hidden drawings (the hero line-art) and the old reading-progress bar,
   which the new header's progress line replaces.

   Scoped to html[data-rk-frame] like the frame and legacy layers.
   ===================================================================== */

html[data-rk-frame] {
  --art-col: 46ch;                                   /* the reading line: 46ch of 18 px Geist, about 550 px */
  --art-block: min(880px, var(--container));         /* the article's own frame, centred; everything starts on its left edge */
  --art-top: clamp(136px, 12vw, 176px);              /* first line below the floating header */
}

/* ---------- 0. the old reading-progress bar: the header's progress line does this now ---------- */
html[data-rk-frame] .art-progress { display: none; }

/* =====================================================================
   1. ARTICLE HERO
   ===================================================================== */
html[data-rk-frame] .art-hero { padding-top: var(--art-top); padding-bottom: 48px; isolation: auto; }
html[data-rk-frame] .art-hero__bg { display: none; }                 /* aria-hidden line-art */
html[data-rk-frame] .art-hero > .container { max-width: none; width: var(--art-block); }

/* breadcrumbs keep the legacy look; every crumb link is at least 44 px square */
html[data-rk-frame] :is(.art-hero, .blog-hero) .breadcrumbs { flex-wrap: wrap; row-gap: 0; }
html[data-rk-frame] :is(.art-hero, .blog-hero) .breadcrumbs a { min-width: 44px; }

/* the "Essay / Sales Ops" kicker: the legacy layer already makes it the quiet dotted kicker */
html[data-rk-frame] .art-badge { margin-top: 24px; margin-bottom: 24px; }
html[data-rk-frame] .art-badge__sep { color: var(--ink3); opacity: .6; }

/* title = the new H1 */
html[data-rk-frame] .art-hero__title {
  font-family: var(--sans); font-weight: 500;
  font-size: clamp(40px, 4.45vw, 66px); line-height: 1.02; letter-spacing: -.043em;
  color: var(--ink); max-width: 20ch; text-wrap: balance;
}
html[data-rk-frame] .art-hero__title em {
  font-family: var(--serif); font-style: italic; font-weight: 400; font-size: 1.08em; letter-spacing: -.015em;
  padding-right: .04em;
  background-image: linear-gradient(var(--acc), var(--acc)); background-repeat: no-repeat; background-position: 0 94%; background-size: 100% 1.5px;
  -webkit-box-decoration-break: clone; box-decoration-break: clone;
}

/* lead = the new .rk-lead */
html[data-rk-frame] .art-lead {
  margin-top: 32px; padding-bottom: 0; border-bottom: 0;
  font-size: clamp(19px, 1.45vw, 23px); line-height: 1.5; letter-spacing: -.01em; color: var(--ink2);
  max-width: 44ch;
}

/* date · read time · author: plain 16 px sentence-case line */
html[data-rk-frame] .art-meta {
  margin-top: 24px; gap: 8px 12px;
  font-family: var(--sans); font-size: 16px; line-height: 1.5; letter-spacing: -.005em; text-transform: none;
  color: var(--ink3);
}
html[data-rk-frame] .art-meta__sep { width: 4px; height: 4px; border-radius: 99px; background: var(--ink3); opacity: .5; }

/* the article drawings were made as navy "data art"; the new pages draw on paper. A filter turns the same
   drawing into ink-and-cobalt on a pale ground (inverted, then hue-rotated so blues stay blue). Same image, same alt. */
html[data-rk-frame] :is(.art-figure img, .blog-card__img, .blog-featured__img) { filter: invert(1) hue-rotate(180deg); }

/* featured image: the same drawing, framed like the new pages' illustrations */
/* (frame and shadow sit on the wrapper, not the filtered image, so the filter does not invert them) */
html[data-rk-frame] .art-figure {
  width: var(--art-block); max-width: none; margin: 0 auto; padding: 0; overflow: hidden;
  border: 1px solid var(--line); border-radius: 2px; box-shadow: 0 30px 60px -44px rgba(10, 15, 31, .35);
}
html[data-rk-frame] .art-figure::after { content: none; display: none; }
html[data-rk-frame] .art-figure img { width: 100%; border: 0; border-radius: 0; box-shadow: none; }

/* =====================================================================
   2. ONE READING COLUMN — contents list above the text
   ===================================================================== */
html[data-rk-frame] .art-body {
  display: block; width: var(--art-block); max-width: none; margin: 0 auto;
  padding: 64px 0 0; container-type: inline-size;
}
html[data-rk-frame] .art-toc-col,
html[data-rk-frame] .art-content { max-width: var(--art-col); font-size: 18px; }

/* the contents: a quiet list (the new pages' index), never pinned to the side */
html[data-rk-frame] .art-toc,
html[data-rk-frame] .art-toc.is-stuck,
html[data-rk-frame] .art-toc.is-bottomed {
  display: block; position: static; top: auto; bottom: auto; left: auto; width: auto;
  margin: 0 0 64px; padding: 0; border: 0;
}
html[data-rk-frame] .art-toc__label {
  display: block; margin: 0 0 16px;
  font-family: var(--sans); font-size: 18px; font-weight: 600; line-height: 1.4; letter-spacing: -.01em; text-transform: none;
  color: var(--ink);
}
html[data-rk-frame] .art-toc__label::before { content: none; display: none; }
html[data-rk-frame] .art-toc__list { display: flex; flex-direction: column; flex-wrap: nowrap; gap: 0; border-left: 1px solid var(--line2); }
html[data-rk-frame] .art-toc__item a {
  position: relative; display: flex; align-items: center; min-height: 44px; margin: 0;
  padding: 8px 0 8px 20px; border: 0; background: none;
  font-size: 16px; font-weight: 500; line-height: 1.35; letter-spacing: -.01em; color: var(--ink2);
  text-decoration: none; transition: color .3s var(--out);
}
html[data-rk-frame] .art-toc__item a::before {
  content: ""; position: absolute; left: -1px; top: 10px; bottom: 10px; width: 2px; background: var(--acc);
  transform: scaleY(0); transform-origin: 50% 0; transition: transform .45s var(--out);
}
html[data-rk-frame] .art-toc__item a:hover { color: var(--ink); }
html[data-rk-frame] .art-toc__item.is-active a { color: var(--ink); background: none; border: 0; }
html[data-rk-frame] .art-toc__item.is-active a::before { transform: scaleY(1); }

/* =====================================================================
   3. PROSE
   ===================================================================== */
html[data-rk-frame] .art-prose { max-width: var(--art-col); font-size: 18px; line-height: 1.6; color: var(--ink2); }
html[data-rk-frame] .art-prose > * + * { margin-top: 24px; }
html[data-rk-frame] .art-prose :where(p, li) { color: var(--ink2); max-width: none; }
html[data-rk-frame] .art-prose strong { color: var(--ink); font-weight: 600; }

/* no drop cap */
html[data-rk-frame] .art-prose > p:first-of-type::first-letter {
  float: none; font: inherit; font-size: inherit; line-height: inherit; padding: 0; color: inherit; background: none;
}

/* headings */
html[data-rk-frame] .art-prose h2 {
  margin-top: 88px; margin-bottom: 0;
  font-family: var(--sans); font-weight: 500;
  font-size: clamp(30px, 2.5vw, 38px); line-height: 1.1; letter-spacing: -.035em; color: var(--ink);
}
html[data-rk-frame] .art-prose h2 + * { margin-top: 24px; }
html[data-rk-frame] .art-prose h3 {
  margin-top: 56px;
  font-family: var(--sans); font-weight: 500;
  font-size: clamp(22px, 1.7vw, 26px); line-height: 1.22; letter-spacing: -.022em; color: var(--ink);
}
html[data-rk-frame] .art-prose h3 + * { margin-top: 16px; }
/* the "No. 01" number: a quiet cobalt index above the heading (the new pages' 01 ——) */
html[data-rk-frame] .art-section-num {
  display: flex; align-items: center; gap: 12px; width: max-content;
  margin: 0 0 16px; padding: 0; background: none; border-radius: 0;
  font-family: var(--sans); font-size: 16px; font-weight: 500; line-height: 1.4; letter-spacing: -.005em; text-transform: none;
  color: var(--acc);
}
html[data-rk-frame] .art-section-num::after { content: ""; width: 40px; height: 1px; background: currentColor; opacity: .6; }

/* running-text links: ink with a cobalt underline; vertical padding widens the tap area to 44 px without moving the line */
html[data-rk-frame] :is(.art-lead, .art-prose, .art-author__bio, .art-closing p, .blog-hero .lede, .blog-section-aside) a:not([class]) {
  color: var(--ink); text-decoration: underline; text-decoration-thickness: 1.5px; text-underline-offset: 4px;
  text-decoration-color: var(--acc); padding-block: 12px; transition: color .2s var(--out);
}
html[data-rk-frame] :is(.art-lead, .art-prose, .art-author__bio, .art-closing p, .blog-hero .lede, .blog-section-aside) a:not([class]):hover { color: var(--acc2); }

/* lists */
html[data-rk-frame] .art-prose :is(ul, ol) { padding-left: 1.3em; }
html[data-rk-frame] .art-prose li + li { margin-top: 12px; }
html[data-rk-frame] .art-prose li::marker { color: var(--ink3); }

/* quote: Geist, a cobalt rule, no decorative marks (the new .rp-base) */
html[data-rk-frame] .art-prose blockquote {
  margin: 40px 0; padding: 4px 0 4px 24px; border-left: 2px solid var(--acc);
  font-family: var(--sans); font-style: normal; font-weight: 500;
  font-size: clamp(20px, 1.5vw, 22px); line-height: 1.45; letter-spacing: -.015em; color: var(--ink);
}
html[data-rk-frame] .art-prose blockquote::before { content: none; display: none; }

html[data-rk-frame] .art-prose hr { height: 0; border: 0; border-top: 1px solid var(--line); background: none; margin: 64px 0; }
html[data-rk-frame] .art-prose code { font-size: .9em; background: var(--paper2); border: 0; }

/* "Key takeaways": the new short-version card */
html[data-rk-frame] .art-tldr {
  margin-block: 40px; padding: 32px;
  background: #fff; border: 1px solid var(--line); border-radius: 2px;
  box-shadow: 0 30px 60px -44px rgba(10, 15, 31, .35);
}
html[data-rk-frame] .art-tldr__label {
  margin: 0 0 16px;
  font-family: var(--sans); font-size: 18px; font-weight: 600; line-height: 1.4; letter-spacing: -.01em; text-transform: none;
  color: var(--ink);
}
html[data-rk-frame] .art-tldr ul { margin: 0; padding: 0; gap: 16px; }
html[data-rk-frame] .art-tldr ul li { margin: 0; padding-left: 28px; font-size: 18px; line-height: 1.55; color: var(--ink); }
html[data-rk-frame] .art-tldr ul li::before {
  content: ""; left: 2px; top: .62em; width: 8px; height: 8px; border-radius: 1px; background: var(--acc);
}

/* callouts: paper-2 cards with ink text (were dark panels with lime labels) */
html[data-rk-frame] .art-counter {
  margin: 40px 0; padding: 32px;
  background: var(--paper2); border: 1px solid var(--line); border-radius: 2px; box-shadow: none; overflow: visible;
}
html[data-rk-frame] .art-counter::before,
html[data-rk-frame] .art-counter::after { content: none; display: none; }
html[data-rk-frame] .art-counter__label {
  margin: 0 0 12px;
  font-family: var(--sans); font-size: 18px; font-weight: 600; line-height: 1.4; letter-spacing: -.01em; text-transform: none;
  color: var(--ink);
}
html[data-rk-frame] .art-counter :is(p, li) { font-size: 18px; line-height: 1.6; color: var(--ink); }
html[data-rk-frame] .art-counter p + :is(p, ul, ol) { margin-top: 12px; }
html[data-rk-frame] .art-counter li + li { margin-top: 8px; }
html[data-rk-frame] .art-counter strong { color: var(--ink); }
html[data-rk-frame] .art-counter a:not([class]) { color: var(--ink); text-decoration-color: var(--acc); }
html[data-rk-frame] .art-counter a:not([class]):hover { color: var(--acc2); text-decoration-color: var(--acc); }

/* cross-reference line ("In this article we also define: …") */
html[data-rk-frame] .art-prose .art-eyebrow {
  margin-top: 16px; margin-bottom: 0; padding-top: 16px; border-top: 1px solid var(--line);
  font-family: var(--sans); font-size: 16px; font-weight: 400; line-height: 1.7; letter-spacing: -.005em; text-transform: none;
  color: var(--ink3);
}
html[data-rk-frame] .art-prose .art-eyebrow a { color: var(--ink2); text-decoration-color: var(--acc); }
html[data-rk-frame] .art-prose .art-eyebrow a:hover { color: var(--ink); }

/* tables */
/* tables are data, not running text: they may use the article's full width (the .art-body container) */
html[data-rk-frame] .art-table-wrap {
  width: 100%; width: 100cqw; max-width: none; margin: 40px 0;
  background: #fff; border: 1px solid var(--line); border-radius: 2px;
}
html[data-rk-frame] .art-table { font-family: var(--sans); font-size: 16px; line-height: 1.5; color: var(--ink2); }
html[data-rk-frame] .art-table caption {
  padding: 16px 20px; background: var(--paper2); border-bottom: 1px solid var(--line);
  font-family: var(--sans); font-size: 16px; font-weight: 600; line-height: 1.4; letter-spacing: -.005em; text-transform: none;
  color: var(--ink);
}
html[data-rk-frame] .art-table thead th {
  padding: 16px 20px; background: #fff; border-bottom: 1px solid var(--line2); white-space: normal;
  font-family: var(--sans); font-size: 16px; font-weight: 600; line-height: 1.4; letter-spacing: -.005em; text-transform: none;
  color: var(--ink);
}
html[data-rk-frame] .art-table thead th:first-child { color: var(--ink); }
html[data-rk-frame] .art-table tbody th { width: auto; padding: 16px 20px; background: none; border-right: 0; border-top: 1px solid var(--line); font-weight: 600; color: var(--ink); vertical-align: top; }
html[data-rk-frame] .art-table tbody td { padding: 16px 20px; border-top: 1px solid var(--line); }
html[data-rk-frame] .art-table tbody tr:first-child :is(td, th) { border-top: 0; }
html[data-rk-frame] .art-table tbody tr:hover { background: none; }

/* sources */
html[data-rk-frame] .art-sources { margin-top: 64px; padding: 32px 0 0; border-top: 1px solid var(--line); }
html[data-rk-frame] .art-prose .art-sources__label {
  margin: 0 0 16px;
  font-family: var(--sans); font-size: 20px; font-weight: 600; line-height: 1.3; letter-spacing: -.015em; text-transform: none;
  color: var(--ink);
}
html[data-rk-frame] .art-sources__list { padding-left: 1.5em; font-family: var(--sans); font-size: 16px; line-height: 1.6; color: var(--ink2); }
html[data-rk-frame] .art-sources__list li { margin: 0; padding-left: 4px; }
html[data-rk-frame] .art-sources__list li + li { margin-top: 12px; }
html[data-rk-frame] .art-sources__list li::marker { font-family: var(--sans); font-size: 16px; font-weight: 500; color: var(--ink3); }
html[data-rk-frame] .art-sources__list a { color: var(--ink); text-decoration-thickness: 1.5px; text-underline-offset: 4px; text-decoration-color: var(--acc); }

/* visible FAQ */
html[data-rk-frame] .art-faq { margin: 40px 0; border-top: 1px solid var(--line); }
html[data-rk-frame] .art-faq details { border-bottom: 1px solid var(--line); }
html[data-rk-frame] .art-faq summary {
  display: flex; align-items: center; min-height: 44px; padding: 16px 40px 16px 0;
  font-family: var(--sans); font-size: 20px; font-weight: 500; line-height: 1.35; letter-spacing: -.015em; color: var(--ink);
}
html[data-rk-frame] .art-faq summary:hover { color: var(--ink); }
html[data-rk-frame] .art-faq summary::after { font-family: var(--sans); font-size: 24px; font-weight: 400; color: var(--acc); right: 4px; }
html[data-rk-frame] .art-faq details > p { margin: 0 0 24px; font-size: 18px; line-height: 1.6; color: var(--ink2); }

/* sign-off: "Filed …" line and topic links */
html[data-rk-frame] .art-footer { max-width: none; margin-top: 64px; padding-top: 32px; border-top: 1px solid var(--line); }
html[data-rk-frame] .art-filed {
  font-family: var(--sans); font-size: 16px; line-height: 1.5; letter-spacing: -.005em; text-transform: none; color: var(--ink3);
}
html[data-rk-frame] .art-filed::before { content: none; display: none; }
html[data-rk-frame] .art-tags { gap: 8px; margin-top: 16px; }
html[data-rk-frame] .art-tag {
  min-height: 44px; padding: 0 16px; border: 1px solid var(--line2); border-radius: 2px; background: #fff;
  font-family: var(--sans); font-size: 16px; font-weight: 500; line-height: 1.2; letter-spacing: -.01em; text-transform: none;
  color: var(--ink2); text-decoration: none; transition: border-color .3s var(--out), color .3s var(--out);
}
html[data-rk-frame] .art-tag:hover { border-color: var(--ink); color: var(--ink); background: #fff; }

/* =====================================================================
   4. AFTER THE ARTICLE: related, author, next step
   ===================================================================== */
/* section labels ("No. 07 / Related ←" etc.): quiet 16 px sentence-case lines */
html[data-rk-frame] :is(.art-related__label, .art-author__label, .art-closing__label) {
  display: block; margin-bottom: 16px;
  font-family: var(--sans); font-size: 16px; font-weight: 500; line-height: 1.4; letter-spacing: -.005em; text-transform: none;
  color: var(--ink3);
}
html[data-rk-frame] :is(.art-related__label, .art-author__label, .art-closing__label)::before { content: none; display: none; }

/* related */
html[data-rk-frame] :is(.art-related, .art-author, .art-closing) > .container { max-width: none; width: var(--art-block); }
html[data-rk-frame] .art-related { margin-top: 128px; padding-block: 96px; border-top: 1px solid var(--line); background: none; }
html[data-rk-frame] .art-related h2 {
  margin-bottom: 0; font-family: var(--sans); font-weight: 500;
  font-size: clamp(34px, 3.1vw, 46px); line-height: 1.06; letter-spacing: -.035em; color: var(--ink);
}
html[data-rk-frame] :is(.art-related, .art-closing) h2 em {
  font-family: var(--serif); font-style: italic; font-weight: 400; font-size: 1.08em; letter-spacing: -.015em;
}

/* related (styles.css .idx-card) → a list of rows: topic on the left, title, summary and link on the right */
html[data-rk-frame] .art-related .index-grid { display: block; border-top: 1px solid var(--line); }
html[data-rk-frame] .art-related .idx-card {
  display: grid; grid-template-columns: 200px minmax(0, 1fr); column-gap: 40px; row-gap: 8px; align-content: start;
  padding: 32px 0; background: none; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; box-shadow: none; transform: none;
  transition: background .4s var(--out);
}
html[data-rk-frame] .art-related .idx-card > * { grid-column: 2; margin: 0; }
html[data-rk-frame] .art-related .idx-card > .meta { grid-column: 1; grid-row: 1 / span 3; align-self: start; padding-top: 4px; }
html[data-rk-frame] .art-related .idx-card:hover { border-color: var(--line); transform: none; box-shadow: none; }
html[data-rk-frame] .art-related .idx-card:hover h3 { color: var(--acc2); }
html[data-rk-frame] .art-related .idx-card::before { content: none; display: none; }
html[data-rk-frame] .art-related .idx-card .meta {
  gap: 6px; flex-wrap: wrap;
  font-family: var(--sans); font-size: 16px; line-height: 1.4; letter-spacing: -.005em; text-transform: none; color: var(--ink3);
}
html[data-rk-frame] .art-related .idx-card h3 { font-size: clamp(22px, 1.7vw, 26px); line-height: 1.2; letter-spacing: -.022em; font-weight: 500; color: var(--ink); transition: color .3s var(--out); }
html[data-rk-frame] .art-related .idx-card h3::after { content: none; display: none; }
html[data-rk-frame] .art-related .idx-card p { max-width: 46ch; font-size: 18px; line-height: 1.55; color: var(--ink2); }
html[data-rk-frame] .art-related .idx-card .read {
  display: inline-flex; align-items: center; min-height: 44px; margin-top: auto; width: max-content;
  font-family: var(--sans); font-size: 16px; font-weight: 500; letter-spacing: -.01em; color: var(--ink);
  background-image: linear-gradient(currentColor, currentColor); background-size: 100% 1px; background-position: 0 calc(50% + 13px); background-repeat: no-repeat;
  transition: color .3s var(--out), background-size .5s var(--out);
}
html[data-rk-frame] .art-related .idx-card:hover .read { letter-spacing: -.01em; color: var(--acc); }

/* author */
html[data-rk-frame] .art-author { padding-block: 96px; border-top: 1px solid var(--line); background: none; }
html[data-rk-frame] .art-author__grid { grid-template-columns: 200px minmax(0, 1fr); gap: 48px; max-width: 920px; }
html[data-rk-frame] .art-author__portrait img { border-radius: 2px; border: 1px solid var(--line); filter: none; box-shadow: 0 30px 60px -40px rgba(10, 15, 31, .45); }
html[data-rk-frame] .art-author__name {
  margin: 0; font-family: var(--sans); font-style: normal; font-weight: 500;
  font-size: clamp(28px, 2.4vw, 36px); line-height: 1.1; letter-spacing: -.03em; color: var(--ink);
}
html[data-rk-frame] .art-author__role {
  margin: 8px 0 24px;
  font-family: var(--sans); font-size: 16px; font-weight: 500; line-height: 1.4; letter-spacing: -.005em; text-transform: none; color: var(--ink3);
}
html[data-rk-frame] .art-author__bio p { max-width: var(--art-col); margin: 0 0 16px; font-size: 18px; line-height: 1.6; color: var(--ink2); }
html[data-rk-frame] .art-author__bio p em { font-family: var(--sans); font-style: italic; color: var(--ink); }
html[data-rk-frame] .art-author__links { gap: 8px 32px; margin-top: 24px; }
html[data-rk-frame] .art-author__link {
  display: inline-flex; align-items: center; gap: 10px; min-height: 44px; min-width: 44px;
  font-family: var(--sans); font-size: 16px; font-weight: 500; letter-spacing: -.01em; text-transform: none; color: var(--ink);
  background-image: linear-gradient(currentColor, currentColor); background-size: 100% 1px; background-position: 0 calc(50% + 13px); background-repeat: no-repeat;
  transition: color .3s var(--out);
}
html[data-rk-frame] .art-author__link:hover { color: var(--acc); }
html[data-rk-frame] .art-author__link--linkedin svg { width: 16px; height: 16px; color: currentColor; }
html[data-rk-frame] .art-author__link--linkedin:hover svg { color: currentColor; }

/* next step */
html[data-rk-frame] .art-closing { padding-block: 112px 128px; border-top: 1px solid var(--line); background: none; }
html[data-rk-frame] .art-closing h2 {
  max-width: 18ch; font-family: var(--sans); font-weight: 500;
  font-size: clamp(38px, 4.3vw, 66px); line-height: 1.02; letter-spacing: -.04em; color: var(--ink);
}
html[data-rk-frame] .art-closing h2 em {
  padding-right: .04em;
  background-image: linear-gradient(var(--acc), var(--acc)); background-repeat: no-repeat; background-position: 0 94%; background-size: 100% 1.5px;
  -webkit-box-decoration-break: clone; box-decoration-break: clone;
}
html[data-rk-frame] .art-closing p { margin-top: 24px; max-width: 44ch; font-size: clamp(19px, 1.45vw, 23px); line-height: 1.5; letter-spacing: -.01em; color: var(--ink2); }
html[data-rk-frame] .art-closing-cta { margin-top: 40px; gap: 16px; }

/* =====================================================================
   5. ARTICLE LISTING (/blog/, /blog/page/2/)
   ===================================================================== */
html[data-rk-frame] .blog-hero { padding-top: var(--art-top); padding-bottom: 64px; overflow: visible; }
html[data-rk-frame] .blog-hero__bg { display: none; }                 /* aria-hidden line-art */
html[data-rk-frame] .blog-hero__stamp { margin-top: 24px; margin-bottom: 0; }
html[data-rk-frame] .blog-hero .hero-headline { margin-top: 24px; max-width: 16ch; font-size: clamp(40px, 4.45vw, 66px); line-height: 1.02; }
html[data-rk-frame] .blog-hero .lede { margin-top: 32px; max-width: 44ch; font-size: clamp(19px, 1.45vw, 23px); line-height: 1.5; color: var(--ink2); }

/* filter chips: 16 px sentence-case labels on 44 px targets */
html[data-rk-frame] .blog-filters { gap: 8px; margin-top: 40px; }
html[data-rk-frame] .blog-filter {
  min-height: 44px; padding: 0 16px; border: 1px solid var(--line2); border-radius: 2px; background: #fff;
  font-family: var(--sans); font-size: 16px; font-weight: 500; line-height: 1.2; letter-spacing: -.01em; text-transform: none;
  color: var(--ink2); transition: border-color .3s var(--out), color .3s var(--out), background .3s var(--out);
}
html[data-rk-frame] .blog-filter:hover { border-color: var(--ink); color: var(--ink); background: #fff; }
html[data-rk-frame] .blog-filter.active { border-color: var(--ink); background: var(--ink); color: #fff; }
html[data-rk-frame] .blog-counter,
html[data-rk-frame] .blog-page-counter {
  margin-top: 16px; font-family: var(--sans); font-size: 16px; line-height: 1.5; letter-spacing: -.005em; color: var(--ink3);
}

/* the sections between hero and grid: tighter, on the 8-point scale */
html[data-rk-frame] .blog-hero + section { padding-top: 0; padding-bottom: 0; }
html[data-rk-frame] .blog-hero + section + section { padding-top: 0; }

/* "No. 01 / The Archive": a quiet left label over a hairline, not a centred rule */
html[data-rk-frame] .blog-divider {
  display: block; margin-top: 96px; padding-top: 16px; border-top: 1px solid var(--line);
  font-family: var(--sans); font-size: 16px; font-weight: 500; line-height: 1.4; letter-spacing: -.005em; color: var(--ink3); text-align: left;
}
html[data-rk-frame] .blog-divider::before,
html[data-rk-frame] .blog-divider::after { content: none; display: none; }

/* section header */
html[data-rk-frame] .blog-section-header { align-items: flex-end; gap: 24px 64px; padding-top: 40px; }
html[data-rk-frame] .blog-section-header h2 { font-size: clamp(36px, 3.6vw, 56px); line-height: 1.04; letter-spacing: -.04em; }
html[data-rk-frame] .blog-section-aside { max-width: 36ch; font-size: 18px; line-height: 1.55; color: var(--ink2); }

/* cards: the new white card, image framed, 16 px quiet labels */
html[data-rk-frame] .blog-grid { gap: 24px; margin-top: 48px; }
html[data-rk-frame] :is(.blog-card, .blog-featured) {
  background: #fff; border: 1px solid var(--line); border-radius: 2px; box-shadow: none;
  transition: border-color .4s var(--out), box-shadow .5s var(--out), transform .5s var(--out);
}
html[data-rk-frame] :is(.blog-card, .blog-featured):hover { border-color: var(--line2); transform: translateY(-2px); box-shadow: 0 30px 60px -40px rgba(10, 15, 31, .4); }
html[data-rk-frame] :is(.blog-card, .blog-featured)::before { content: none; display: none; }
html[data-rk-frame] :is(.blog-card__img, .blog-featured__img) { border: 0; }
html[data-rk-frame] .blog-card__body { border-top: 1px solid var(--line); }
html[data-rk-frame] .blog-featured__body { border-left: 1px solid var(--line); }
html[data-rk-frame] .blog-card__num {
  top: 12px; left: 12px; right: auto; z-index: 3;
  padding: 2px 8px; border-radius: 2px; background: rgba(255, 255, 255, .92); border: 1px solid var(--line);
  font-family: var(--sans); font-size: 16px; font-weight: 500; line-height: 1.4; letter-spacing: -.005em; color: var(--ink2); opacity: 1;
}
html[data-rk-frame] .blog-card__body { gap: 12px; padding: 28px 32px 8px; }
html[data-rk-frame] :is(.blog-card__cat, .blog-featured__body .blog-card__cat) {
  font-family: var(--sans); font-size: 16px; font-weight: 500; line-height: 1.4; letter-spacing: -.005em; text-transform: none; color: var(--ink3);
}
html[data-rk-frame] .blog-card__body h3 { font-size: clamp(22px, 1.7vw, 26px); line-height: 1.2; letter-spacing: -.022em; font-weight: 500; color: var(--ink); }
html[data-rk-frame] .blog-card__body p { font-size: 17px; line-height: 1.55; color: var(--ink2); }
html[data-rk-frame] .blog-card__foot { padding: 8px 32px 24px; gap: 16px; }
html[data-rk-frame] :is(.blog-card__foot .read-link, .blog-featured__body .read-essay) {
  display: inline-flex; align-items: center; min-height: 44px; width: max-content;
  font-family: var(--sans); font-size: 16px; font-weight: 500; letter-spacing: -.01em; color: var(--ink);
  background-image: linear-gradient(currentColor, currentColor); background-size: 100% 1px; background-position: 0 calc(50% + 13px); background-repeat: no-repeat;
  transition: color .3s var(--out);
}
html[data-rk-frame] :is(.blog-card:hover .read-link, .blog-featured:hover .read-essay) { letter-spacing: -.01em; color: var(--acc); }
html[data-rk-frame] :is(.blog-card__foot .date-label, .blog-featured__meta) {
  font-family: var(--sans); font-size: 16px; line-height: 1.4; letter-spacing: -.005em; color: var(--ink3);
}
html[data-rk-frame] .blog-featured__meta .sep { width: 4px; height: 4px; background: var(--ink3); opacity: .5; }
html[data-rk-frame] .blog-featured__body { gap: 16px; padding: clamp(32px, 3vw, 48px); }
html[data-rk-frame] .blog-featured__body h3 { font-size: clamp(26px, 2.2vw, 34px); line-height: 1.12; letter-spacing: -.03em; font-weight: 500; color: var(--ink); }
html[data-rk-frame] .blog-featured__body p { font-size: 18px; line-height: 1.55; color: var(--ink2); max-width: 44ch; }

/* pagination: 16 px, 44 px targets */
html[data-rk-frame] .pagination {
  justify-content: flex-start; gap: 8px; margin-top: 64px; padding-bottom: 96px;
  font-family: var(--sans); font-size: 16px; letter-spacing: -.005em;
}
html[data-rk-frame] :is(.pagination__link, .pagination__prev, .pagination__next, .pagination__current) {
  min-width: 44px; height: 44px; padding: 0 16px; border-radius: 2px; text-transform: none;
  font-family: var(--sans); font-size: 16px; font-weight: 500; letter-spacing: -.01em;
}
html[data-rk-frame] :is(.pagination__link, .pagination__prev, .pagination__next) { border: 1px solid var(--line2); background: #fff; color: var(--ink2); }
html[data-rk-frame] :is(.pagination__link, .pagination__prev, .pagination__next):hover { border-color: var(--ink); color: var(--ink); }
html[data-rk-frame] .pagination__current { border: 1px solid var(--ink); background: var(--ink); color: #fff; font-weight: 500; }
html[data-rk-frame] .pagination__sep { color: var(--ink3); opacity: .6; }

/* =====================================================================
   6. BETWEEN PHONE AND DESKTOP
   ===================================================================== */
@media (max-width: 900px) {
  html[data-rk-frame] .art-related .idx-card { grid-template-columns: 160px minmax(0, 1fr); column-gap: 24px; }
}
@media (max-width: 768px) {
  html[data-rk-frame] .blog-featured__body { border-left: 0; border-top: 1px solid var(--line); }
}

/* =====================================================================
   7. PHONE (max-width: 760px) — the new pages' phone scale
   ===================================================================== */
@media (max-width: 760px) {
  html[data-rk-frame] { --art-top: 120px; }
  html[data-rk-frame] .art-hero { padding-bottom: 40px; }
  html[data-rk-frame] .art-hero__title { font-size: 38px; line-height: 1.07; letter-spacing: -.045em; }
  html[data-rk-frame] .art-lead { margin-top: 24px; font-size: 18.5px; }
  html[data-rk-frame] .art-meta { column-gap: 16px; }
  html[data-rk-frame] .art-meta__sep { display: none; }   /* the line wraps on a phone, so no dot is left hanging */
  html[data-rk-frame] .art-figure img { width: 100%; }
  html[data-rk-frame] .art-body { padding-top: 48px; padding-inline: 0; }
  html[data-rk-frame] .art-toc-col,
  html[data-rk-frame] .art-content,
  html[data-rk-frame] .art-prose { max-width: none; }
  html[data-rk-frame] .art-toc { margin-bottom: 48px; padding: 0; }
  html[data-rk-frame] .art-prose h2 { margin-top: 72px; font-size: 30px; line-height: 1.1; }
  html[data-rk-frame] .art-prose h3 { margin-top: 48px; font-size: 22px; }
  html[data-rk-frame] .art-prose blockquote { font-size: 20px; padding-left: 20px; }
  html[data-rk-frame] :is(.art-tldr, .art-counter) { padding: 24px 20px; margin-block: 32px; }
  html[data-rk-frame] :is(.art-table caption, .art-table thead th, .art-table tbody th, .art-table tbody td) { padding: 12px 16px; }
  html[data-rk-frame] .art-related { margin-top: 96px; padding-block: 72px; }
  html[data-rk-frame] .art-related h2 { font-size: 34px; }
  html[data-rk-frame] .art-related .idx-card { grid-template-columns: minmax(0, 1fr); padding: 24px 0; }
  html[data-rk-frame] .art-related .idx-card > .meta { grid-column: 1; grid-row: auto; padding-top: 0; }
  html[data-rk-frame] .art-related .idx-card > * { grid-column: 1; }
  html[data-rk-frame] .art-author { padding-block: 72px; }
  html[data-rk-frame] .art-author__grid { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  html[data-rk-frame] .art-author__portrait img { width: 120px; height: 120px; }
  html[data-rk-frame] .art-closing { padding-block: 72px 96px; }
  html[data-rk-frame] .art-closing h2 { font-size: 36px; line-height: 1.06; }
  html[data-rk-frame] .art-closing p { font-size: 18.5px; }

  html[data-rk-frame] .blog-hero { padding-bottom: 48px; }
  html[data-rk-frame] .blog-hero .hero-headline { font-size: 38px; line-height: 1.07; letter-spacing: -.045em; }
  html[data-rk-frame] .blog-hero .lede { font-size: 18.5px; }
  html[data-rk-frame] .blog-filter { padding: 0 14px; font-size: 16px; }
  html[data-rk-frame] .blog-divider { margin-top: 72px; }
  html[data-rk-frame] .blog-section-header h2 { font-size: 34px; }
  html[data-rk-frame] .blog-grid { gap: 16px; margin-top: 40px; }
  html[data-rk-frame] .blog-card__body { padding: 24px 20px 8px; }
  html[data-rk-frame] .blog-card__foot { padding: 8px 20px 20px; }
  html[data-rk-frame] .blog-featured__body { padding: 24px 20px; }
  html[data-rk-frame] .pagination { flex-wrap: wrap; margin-top: 48px; padding-bottom: 72px; }
}

/* =====================================================================
   8. DARK MODE (html.dark, set before first paint by /assets/rubikn-theme.js)
   ---------------------------------------------------------------------
   rubikn-frame.css re-points the tokens this file reads (--ink, --ink2,
   --ink3, --acc, --acc2, --paper2, --line, --line2) onto the shared dark
   palette (rubikn-brand.css --rk-d-*), so type, links, rules, the contents
   list, callouts, quotes, sources, FAQ, related rows, author and closing
   already follow. What is left is what the light rules above hard-code for
   paper: white cards and chips, ink-filled chips with white text, ink
   shadows, the drawing filter and two separators dimmed by opacity.
   Every rule sits under html[data-rk-frame].dark, so light mode is untouched.
   Spec: scripts/DARK-MODE-SPEC.md (rules 2, 4, 5, 8, 15-17).
   ===================================================================== */

/* the drawings: in light mode a filter turns the navy "data art" into ink on paper; a dark page
   takes the original navy drawing as it was made (no filter), framed by a hairline */
html[data-rk-frame].dark :is(.art-figure img, .blog-card__img, .blog-featured__img) { filter: none; }
html[data-rk-frame].dark .art-figure { border-color: var(--rk-d-line); box-shadow: 0 30px 60px -40px rgba(0, 0, 0, .85); }

/* "/" and "—" separators: --rk-d-text-3 at full strength (7.9:1; under the light .6 opacity it is 3.5:1) */
html[data-rk-frame].dark :is(.art-badge__sep, .pagination__sep) { opacity: 1; }

/* key takeaways: the white card becomes a raised panel with a hairline and a quiet dark shadow */
html[data-rk-frame].dark .art-tldr { background: var(--rk-d-raised); border-color: var(--rk-d-line); box-shadow: 0 30px 60px -44px rgba(0, 0, 0, .85); }

/* callouts (paper-2 wells in light): raised through the tokens; the hairline in the shared line colour */
html[data-rk-frame].dark .art-counter { border-color: var(--rk-d-line); }

/* tables: a raised panel; the caption one step up, as paper-2 over white in light */
html[data-rk-frame].dark .art-table-wrap { background: var(--rk-d-raised); border-color: var(--rk-d-line); }
html[data-rk-frame].dark .art-table caption { background: var(--rk-d-raised-2); border-bottom-color: var(--rk-d-line); }
html[data-rk-frame].dark .art-table thead th { background: var(--rk-d-raised); }

/* topic chips (article foot) and filter chips (listing): raised chips; hover a step up */
html[data-rk-frame].dark :is(.art-tag, .blog-filter) { background: var(--rk-d-raised); }
html[data-rk-frame].dark :is(.art-tag, .blog-filter):hover { background: var(--rk-d-raised-2); }
/* the selected filter and the current page: ink chips with white text in light; they invert like the primary button */
html[data-rk-frame].dark .blog-filter.active,
html[data-rk-frame].dark .pagination__current { background: #f8f8fa; border-color: #f8f8fa; color: #0a0f1f; }

/* author portrait: a photo, unchanged; only its shadow goes dark */
html[data-rk-frame].dark .art-author__portrait img { box-shadow: 0 30px 60px -40px rgba(0, 0, 0, .85); }

/* article cards on the listing: raised panels (the navy drawing sits on top, unfiltered) */
html[data-rk-frame].dark :is(.blog-card, .blog-featured) { background: var(--rk-d-raised); }
html[data-rk-frame].dark :is(.blog-card, .blog-featured):hover { box-shadow: 0 30px 60px -40px rgba(0, 0, 0, .9); }
/* the card number over the drawing: a raised chip instead of a white one */
html[data-rk-frame].dark .blog-card__num { background: rgba(17, 22, 32, .94); border-color: rgba(255, 255, 255, .14); color: var(--rk-d-text-2); }

/* pagination: raised buttons with the token hairline */
html[data-rk-frame].dark :is(.pagination__link, .pagination__prev, .pagination__next) { background: var(--rk-d-raised); }

/* ---------- reduced motion: nothing moves ---------- */
@media (prefers-reduced-motion: reduce) {
  html[data-rk-frame] :is(.art-toc__item a, .art-toc__item a::before, .art-tag, .art-related .idx-card, .art-related .idx-card .read,
    .art-author__link, .blog-filter, .blog-card, .blog-featured, .blog-card__foot .read-link, .blog-featured__body .read-essay) { transition: none; }
  html[data-rk-frame] :is(.art-related .idx-card, .blog-card, .blog-featured):hover { transform: none; }
}