/* ============================================================
   SECTIONS LAB · pages/blog.css — BDG's blog post and listing (2026-09-13)
   Loads on every page view, so every class is .blog-* (groups/blog.css is .post-*).
   Reading type, all on the house scale (decisions in labs/handoff/blog-pages.md):
     article body   18px = --fs-lead (the house body is 16px), line-height 1.65,
                    measure 62ch = --measure at 18px (≈ 66–70 German characters),
                    paragraphs about one line apart, never justified
     article h2     32px = the floor of the --fs-h2 curve; h3 = --fs-h3
     article title  the --fs-h2 curve (a 78-character title at --fs-display
                    runs seven lines on a phone)
   The tokens below are set on each section, where its band has already
   pointed --fg/--bg at one palette, so they read right on dark and on lift.
   ============================================================ */
:is(.blog-head, .blog-body, .blog-end, .blog-rel, .blog-lhead, .blog-lead, .blog-list, .blog-shelves) {
  --blog-ink: color-mix(in oklab, var(--fg) 87%, var(--bg));    /* reading text: never pure white on dark */
  --blog-rule: color-mix(in oklab, var(--fg) 18%, var(--bg));   /* a divider that survives the dark ground */
  --blog-h2: 32px;
  --blog-col: calc(var(--measure) * 1.125);                     /* 62ch at 18px, said in a 16px box */
  --blog-rail: 250px;
}

/* ---------- shared: breadcrumbs, avatar, byline ---------- */
.blog-crumbs ol { display: flex; flex-wrap: wrap; margin: 0 0 var(--sp-6); padding: 0; list-style: none; font-size: var(--fs-small); color: var(--fg-dim); }
.blog-crumbs li + li::before { content: '/'; margin-inline: 10px; }
.blog-crumbs a { color: var(--fg-muted); text-decoration: none; }
.blog-crumbs a:hover { color: var(--fg); text-decoration: underline; text-underline-offset: .22em; }

.blog-avatar {
  flex: none; display: inline-grid; place-items: center; width: 44px; height: 44px; border-radius: 50%;
  background: var(--surface); border: 1px solid var(--blog-rule); color: var(--fg);
  font: 600 var(--fs-small)/1 var(--font-head); letter-spacing: .04em;
}
.blog-avatar--lg { width: 72px; height: 72px; font-size: var(--fs-h3); }

.blog-byline { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-2) var(--sp-3); margin-top: var(--sp-6); }
.blog-byline p { max-width: none; }
.blog-byline__who { display: grid; gap: 2px; font-size: var(--fs-small); line-height: 1.4; color: var(--fg-muted); }
.blog-byline__who a, .blog-byline__name { color: var(--fg); font-size: var(--fs-body); font-weight: 600; text-decoration: none; }
.blog-byline__who a:hover { text-decoration: underline; text-underline-offset: .22em; }
.blog-byline__facts { display: flex; flex-wrap: wrap; gap: var(--sp-2); align-self: stretch; align-items: center; padding-left: var(--sp-3); border-left: 1px solid var(--blog-rule); font-size: var(--fs-small); color: var(--fg-muted); }
.blog-byline__facts > * + *::before { content: '·'; margin-right: var(--sp-2); color: var(--fg-dim); }
@media (max-width: 600px) { .blog-byline__facts { flex-basis: 100%; padding-left: 0; border-left: 0; } }

/* ---------- post header ---------- */
.blog-head { padding-block: var(--sp-9) var(--sp-7); }
.blog-head h1 { max-width: 24ch; font-size: var(--fs-h2); line-height: var(--lh-head); text-wrap: balance; }
.blog-head .lead { margin-top: var(--sp-4); max-width: 52ch; }
.blog-head__photo { margin-top: var(--sp-8); }
@media (max-width: 700px) { .blog-head__photo { aspect-ratio: var(--ratio-teaser, 16 / 9); } }
.blog-head--split .blog-head__grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: var(--sp-8); align-items: end; }
@media (max-width: 1000px) { .blog-head--split .blog-head__grid { grid-template-columns: minmax(0, 1fr); gap: var(--sp-6); } }

/* ---------- reading body ---------- */
.blog-body { padding-block: var(--sp-8) var(--sp-7); }
.blog-head + .blog-body { border-top: 0; }
.blog-body__grid { display: grid; grid-template-columns: minmax(0, var(--blog-col)); row-gap: var(--sp-6); align-items: start; }
@media (min-width: 1200px) {
  .blog-body--rail .blog-body__grid { grid-template-columns: var(--blog-rail) minmax(0, var(--blog-col)); column-gap: var(--sp-8); }
  .blog-body--rail :is(.blog-keys, .blog-prose) { grid-column: 2; }
  .blog-body--rail .blog-toc { grid-column: 1; grid-row: 1 / span 2; position: sticky; top: var(--sp-7); }
}

.blog-keys { padding: var(--sp-5); border: 1px solid var(--blog-rule); border-radius: var(--radius-card); background: var(--surface); font-size: var(--fs-lead); line-height: 1.55; color: var(--blog-ink); }
.blog-keys p { max-width: none; }
.blog-keys__h { margin-bottom: var(--sp-3); font-size: var(--fs-eyebrow); font-weight: 600; letter-spacing: var(--ls-eyebrow); text-transform: uppercase; color: var(--fg-dim); }
.blog-keys ul { display: grid; gap: var(--sp-2); margin: 0; padding-left: 1.1em; }
.blog-keys li::marker { color: var(--brand); }
@media (max-width: 600px) { .blog-keys { padding: var(--sp-4); font-size: var(--fs-body); } }   /* 18px in a padded phone box ran ~28 characters a line */

/* contents: a boxed accordion where it sits in the column, a bare list when it pins in the rail */
.blog-toc { padding: 0 var(--sp-4); border: 1px solid var(--blog-rule); border-radius: var(--radius-card); font-size: var(--fs-small); }
.blog-toc > summary {
  display: flex; align-items: center; justify-content: space-between; min-height: 48px; cursor: pointer; list-style: none;
  font-size: var(--fs-eyebrow); font-weight: 600; letter-spacing: var(--ls-eyebrow); text-transform: uppercase; color: var(--fg-dim);
}
.blog-toc > summary::-webkit-details-marker { display: none; }
.blog-toc > summary::after { content: ''; width: 7px; height: 7px; margin: -4px 4px 0 0; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg); transition: transform .3s var(--ease-out); }
.blog-toc[open] > summary::after { margin-top: 4px; transform: rotate(-135deg); }
.blog-toc > summary:focus-visible { outline: 2px solid var(--fg); outline-offset: 4px; border-radius: 2px; }
.blog-toc nav { padding-bottom: var(--sp-4); }
.blog-toc ol { margin: 0; padding: 0; list-style: none; }
.blog-toc nav > ol { border-left: 1px solid var(--blog-rule); }
.blog-toc a { display: block; margin-left: -1px; padding: 6px 0 6px 16px; border-left: 2px solid transparent; line-height: 1.4; color: var(--fg-muted); text-decoration: none; transition: color .2s, border-color .2s; }
.blog-toc nav > ol > li > a { color: var(--fg); font-weight: 500; }
.blog-toc ol ol a { padding-left: 28px; }
.blog-toc a:hover { color: var(--fg); }
.blog-toc a:is([aria-current], .is-within) { color: var(--fg); }
.blog-toc a[aria-current] { border-left-color: var(--brand); }
.blog-toc:not(.blog-toc--deep) nav > ol { counter-reset: toc; }
.blog-toc:not(.blog-toc--deep) nav > ol > li { counter-increment: toc; }
.blog-toc:not(.blog-toc--deep) nav > ol > li > a::before { content: counter(toc, decimal-leading-zero); display: inline-block; min-width: 2.2em; color: var(--fg-dim); font-variant-numeric: tabular-nums; }
@media (min-width: 1200px) {
  .blog-body--rail .blog-toc { padding: 0; border: 0; border-radius: 0; }
  .blog-body--rail .blog-toc > summary { min-height: 0; margin-bottom: var(--sp-3); cursor: default; pointer-events: none; }
  .blog-body--rail .blog-toc > summary::after { display: none; }
}

/* the article */
.blog-prose { font-size: var(--fs-lead); line-height: 1.65; color: var(--blog-ink); }
.blog-prose > * { margin-block: 0; }
.blog-prose > * + * { margin-top: 1.05em; }
.blog-prose p { max-width: none; color: inherit; }
.blog-prose :is(h2, h3) { color: var(--fg); scroll-margin-top: var(--sp-7); text-wrap: balance; }
.blog-prose h2 { margin-top: 2.3em; font-size: var(--blog-h2); line-height: 1.15; }
.blog-prose h3 { margin-top: 1.8em; font-size: var(--fs-h3); line-height: 1.3; }
.blog-prose :is(h2, h3) + * { margin-top: .6em; }
.blog-prose h2 + h3 { margin-top: 1.2em; }
.blog-prose strong { color: var(--fg); font-weight: 600; }
.blog-prose :is(ul, ol) { padding-left: 1.3em; }
.blog-prose li + li { margin-top: .4em; }
.blog-prose li::marker { color: var(--fg-dim); }
.blog-prose ol > li::marker { font-weight: 600; font-variant-numeric: tabular-nums; }
.blog-prose > :is(.blog-note, .blog-table, .blog-figure, .blog-pull, .blog-steps) { margin-top: 1.6em; }
.blog-prose > :is(.blog-note, .blog-table, .blog-figure, .blog-pull, .blog-steps) + * { margin-top: 1.6em; }
.blog-prose > :is(.blog-note, .blog-table, .blog-figure, .blog-pull, .blog-steps) + :is(h2, h3) { margin-top: 1.8em; }

.blog-note { padding: var(--sp-4) var(--sp-5); border: 1px solid var(--blog-rule); border-radius: var(--radius-card); background: var(--surface); box-shadow: inset 3px 0 0 var(--brand); font-size: var(--fs-body); line-height: 1.6; }
.blog-note b { display: block; margin-bottom: 4px; font-size: var(--fs-eyebrow); font-weight: 600; letter-spacing: var(--ls-eyebrow); text-transform: uppercase; color: var(--fg-dim); }

.blog-table { overflow-x: auto; font-size: var(--fs-body); line-height: 1.5; }
.blog-table:focus-visible { outline: 2px solid var(--fg); outline-offset: 4px; }
.blog-table table { width: 100%; min-width: 520px; border-collapse: collapse; }
.blog-table :is(th, td) { padding: var(--sp-2) var(--sp-3) var(--sp-2) 0; border-bottom: 1px solid var(--blog-rule); text-align: left; vertical-align: top; }
.blog-table thead th { font-size: var(--fs-eyebrow); font-weight: 600; letter-spacing: var(--ls-eyebrow); text-transform: uppercase; color: var(--fg-dim); }
.blog-table tbody th { width: 38%; color: var(--fg); font-weight: 600; }

.blog-prose > .blog-figure { margin-inline: 0; }

.blog-steps { display: flex; flex-wrap: wrap; gap: var(--sp-1); padding: 0 !important; list-style: none; counter-reset: step; font-size: var(--fs-body); }
.blog-steps li { display: inline-flex; align-items: center; gap: 10px; margin: 0 !important; padding: 9px 14px; border: 1px solid var(--blog-rule); border-radius: var(--radius-btn, 4px); color: var(--fg); counter-increment: step; }
.blog-steps li::before { content: counter(step); font: 600 var(--fs-small)/1 var(--font-head); color: var(--fg-dim); }
.blog-steps li:last-child { border-color: var(--brand); }

.blog-pull { padding-left: var(--sp-5); border-left: 2px solid var(--brand); }
.blog-pull p:first-child { font: 600 var(--blog-h2)/1.15 var(--font-head); letter-spacing: var(--ls-display); color: var(--fg); }
.blog-pull p + p { margin-top: var(--sp-2); font-size: var(--fs-body); color: var(--fg-muted); }

/* ---------- author & sharing ---------- */
.blog-end { padding-block: 0 var(--sp-8); border-top: 0; }
.blog-author { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--sp-4); max-width: var(--blog-col); padding-top: var(--sp-6); border-top: 1px solid var(--blog-rule); }
@media (min-width: 1200px) { :root:has(.blog-body--rail) .blog-author { margin-left: calc(var(--blog-rail) + var(--sp-8)); } }
.blog-author__body .eyebrow { margin-bottom: var(--sp-2); }
.blog-author__name { font-size: var(--fs-h3); }
.blog-author__role { margin-top: 2px; font-size: var(--fs-small); color: var(--fg-dim); }
.blog-author__bio { margin-top: var(--sp-3); }
.blog-author .link { margin-top: var(--sp-3); }
.blog-author__who { display: grid; gap: 2px; font-size: var(--fs-small); line-height: 1.4; color: var(--fg-muted); }
.blog-author__who a { color: var(--fg); font-size: var(--fs-body); font-weight: 600; text-decoration: none; }
.blog-author--line { grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; }

.blog-share { grid-column: 1 / -1; display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-2) var(--sp-3); padding-top: var(--sp-4); border-top: 1px solid var(--blog-rule); }
.blog-author--line .blog-share { grid-column: auto; padding-top: 0; border-top: 0; }
.blog-author--line .blog-share__h { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }   /* the list's aria-label says it; the name keeps its line */
.blog-share__h { font-size: var(--fs-small); color: var(--fg-dim); }
.blog-share ul { display: flex; flex-wrap: wrap; gap: var(--sp-1); margin: 0; padding: 0; list-style: none; }
.blog-share :is(a, button) {
  appearance: none; display: inline-flex; align-items: center; min-height: 44px; padding: 0 14px;   /* 44px: the tap target on a phone */
  border: 1px solid var(--blog-rule); border-radius: var(--radius-btn, 4px); background: transparent; color: var(--fg);
  font: 500 var(--fs-small)/1 var(--font-body); text-decoration: none; cursor: pointer; transition: border-color .2s;
}
.blog-share :is(a, button):hover { border-color: var(--fg-muted); }
.blog-share :is(a, button):focus-visible { outline: 2px solid var(--fg); outline-offset: 2px; }
.blog-share__ok { font-size: var(--fs-small); color: var(--fg-muted); }
.blog-share__ok:empty { display: none; }
@media (max-width: 760px) { .blog-author--line { grid-template-columns: auto minmax(0, 1fr); } .blog-author--line .blog-share { grid-column: 1 / -1; } }

/* ---------- related ---------- */
.blog-rel__head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: var(--sp-4) var(--sp-6); margin-bottom: var(--sp-7); }
.blog-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--sp-6) var(--sp-5); margin: 0; padding: 0; list-style: none; }
@media (max-width: 900px) { .blog-cards { grid-template-columns: minmax(0, 1fr); } }
.blog-card { display: block; color: inherit; text-decoration: none; }
.blog-card .photo img { transition: transform .8s var(--ease-out); }
.blog-card__meta, .blog-row__meta { display: flex; flex-wrap: wrap; gap: 0 8px; font-size: var(--fs-small); color: var(--fg-dim); }
.blog-card__meta { margin-top: var(--sp-3); }
.blog-card__meta > * + *::before { content: '·'; margin-right: 8px; }
.blog-card__t { margin-top: var(--sp-1); font-size: var(--fs-h3); line-height: 1.3; }
@media (hover: hover) {
  .blog-card:hover .photo img { transform: scale(1.03); }
  :is(.blog-card, .blog-lead__card):hover :is(.blog-card__t, .blog-lead__t), .blog-row:hover .blog-row__t { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .18em; }
}

/* ---------- rows (listing and related) ---------- */
.blog-rows { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--blog-rule); }
.blog-rows > li { border-bottom: 1px solid var(--blog-rule); }
.blog-row { display: grid; grid-template-columns: minmax(10rem, 14rem) minmax(0, 1fr) auto; gap: var(--sp-2) var(--sp-6); align-items: baseline; padding-block: var(--sp-5); color: inherit; text-decoration: none; }
.blog-row__meta { flex-direction: column; gap: 2px; }
.blog-row__meta > :first-child { color: var(--fg-muted); font-weight: 500; }
.blog-row__t { font-size: var(--fs-h3); line-height: 1.3; max-width: 44ch; }
.blog-row__s { margin-top: 6px; }
.blog-row__go { color: var(--fg-muted); transition: transform .3s var(--ease-out), color .2s; }
@media (hover: hover) { .blog-row:hover .blog-row__go { color: var(--fg); transform: translateX(4px); } }
.blog-row:focus-visible, .blog-card:focus-visible, .blog-lead__card:focus-visible, .blog-shelf__rows a:focus-visible { outline: 2px solid var(--fg); outline-offset: 4px; border-radius: 2px; }
@media (max-width: 760px) {
  .blog-row { grid-template-columns: minmax(0, 1fr) auto; }
  .blog-row__meta { grid-column: 1 / -1; flex-direction: row; }
  .blog-row__meta > * + *::before { content: '·'; margin-right: 8px; }
}
@keyframes blog-in { from { opacity: 0; transform: translateY(10px); } }
.blog-rows > li.is-in { animation: blog-in .5s var(--ease-out) both; animation-delay: calc(var(--i, 0) * 45ms); }

/* ---------- listing header ---------- */
.blog-lhead { padding-block: var(--sp-9) var(--sp-8); }
.blog-lhead__grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: var(--sp-6) var(--sp-8); align-items: end; }
.blog-lhead .lead { margin-top: var(--sp-4); }
.blog-search { display: flex; align-items: end; gap: var(--sp-2); }
.blog-search .field { flex: 1; margin: 0; }
.blog-search .btn { flex: none; }
.blog-lhead__facts { display: flex; flex-wrap: wrap; gap: var(--sp-2) var(--sp-6); margin: var(--sp-5) 0 0; padding: 0; list-style: none; font-size: var(--fs-small); color: var(--fg-muted); }
.blog-lhead__facts b { margin-right: 8px; font: 700 var(--fs-h3)/1 var(--font-head); color: var(--fg); }
@media (max-width: 1000px) { .blog-lhead__grid { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 520px) { .blog-search { flex-direction: column; align-items: stretch; } }

/* ---------- lead post ---------- */
.blog-lead { padding-block: var(--sp-8); }
.blog-lead__card { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: var(--sp-5) var(--sp-7); align-items: center; color: inherit; text-decoration: none; }
.blog-lead__t { font-size: var(--blog-h2); line-height: 1.15; text-wrap: balance; }
.blog-lead__s { margin-top: var(--sp-3); font-size: var(--fs-lead); }
.blog-lead .blog-byline { margin-top: var(--sp-5); }
.blog-lead .link { margin-top: var(--sp-5); }
.blog-lead--wide .blog-lead__card { grid-template-columns: minmax(0, 1fr); }
/* wide: title on the left; summary, author and the way in on the right, in that order */
.blog-lead--wide .blog-lead__copy { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0 var(--sp-8); align-items: start; }
.blog-lead--wide .blog-lead__copy > .eyebrow { grid-area: 1 / 1; }
.blog-lead--wide .blog-lead__t { grid-area: 2 / 1 / 5 / 2; }
.blog-lead--wide .blog-lead__s { grid-area: 2 / 2; margin-top: 0; }
.blog-lead--wide .blog-byline { grid-area: 3 / 2; }
.blog-lead--wide .link { grid-area: 4 / 2; justify-self: start; }
@media (max-width: 900px) {
  .blog-lead__card { grid-template-columns: minmax(0, 1fr); }
  .blog-lead--wide .blog-lead__copy { display: block; }
  .blog-lead--wide .blog-lead__s { margin-top: var(--sp-3); }
}
@media (max-width: 700px) { .blog-lead--wide .photo--band { aspect-ratio: var(--ratio-teaser, 16 / 9); } }

/* ---------- all posts: chips, status, pages ---------- */
.blog-list__head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: var(--sp-3) var(--sp-6); margin-bottom: var(--sp-6); }
.blog-list__status { font-size: var(--fs-small); color: var(--fg-muted); }
.blog-chips { display: flex; flex-wrap: wrap; gap: var(--sp-1); margin-bottom: var(--sp-6); }
.blog-chips button {
  appearance: none; display: inline-flex; align-items: center; gap: 8px; min-height: 40px; padding: 0 16px;
  border: 1px solid var(--blog-rule); border-radius: 999px; background: transparent; color: var(--fg-muted);
  font: 500 var(--fs-small)/1 var(--font-body); cursor: pointer; transition: background-color .2s, color .2s, border-color .2s;
}
.blog-chips b { font-weight: 500; }
.blog-chips span { color: var(--fg-dim); font-variant-numeric: tabular-nums; }
.blog-chips button:hover { color: var(--fg); border-color: var(--fg-muted); }
.blog-chips button[aria-pressed="true"] { border-color: var(--fg); background: var(--fg); color: var(--bg); }
.blog-chips button[aria-pressed="true"] span { color: color-mix(in oklab, var(--bg) 70%, var(--fg)); }
.blog-chips button:focus-visible { outline: 2px solid var(--fg); outline-offset: 2px; }
.blog-pages ol { display: flex; gap: var(--sp-1); margin: var(--sp-7) 0 0; padding: 0; list-style: none; }
.blog-pages a { display: inline-grid; place-items: center; min-width: 44px; height: 44px; border: 1px solid var(--blog-rule); border-radius: var(--radius-btn, 4px); color: var(--fg-muted); text-decoration: none; font-variant-numeric: tabular-nums; }
.blog-pages a:hover { color: var(--fg); border-color: var(--fg-muted); }
.blog-pages a[aria-current] { border-color: var(--fg); background: var(--fg); color: var(--bg); }

/* ---------- topic shelves ---------- */
.blog-shelf { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: var(--sp-4) var(--sp-8); padding-block: var(--sp-6); border-top: 1px solid var(--blog-rule); }
.blog-shelf__head p { margin-top: var(--sp-2); }
.blog-shelf__head .link { margin-top: var(--sp-3); }
.blog-shelf__rows { margin: 0; padding: 0; list-style: none; }
.blog-shelf__rows a { display: grid; grid-template-columns: 10rem minmax(0, 1fr); gap: var(--sp-3); padding-block: 14px; border-bottom: 1px solid var(--blog-rule); color: var(--fg); text-decoration: none; }
.blog-shelf__rows li:first-child a { padding-top: 4px; }
.blog-shelf__rows time { padding-top: 2px; font-size: var(--fs-small); color: var(--fg-dim); }
.blog-shelf__rows span { font-weight: 500; }
@media (hover: hover) { .blog-shelf__rows a:hover span { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .18em; } }
@media (max-width: 900px) { .blog-shelf { grid-template-columns: minmax(0, 1fr); } .blog-shelf__rows a { grid-template-columns: minmax(0, 1fr); gap: 2px; } }

@media (prefers-reduced-motion: reduce) {
  .blog-card .photo img, .blog-row__go, .blog-toc > summary::after { transition: none; }
  .blog-card:hover .photo img { transform: none; }
  .blog-rows > li.is-in { animation: none; }
}