/* PROTOTYPE — blog post detail + series hub/detail on the inner-page stage (PageShell). Tokens, nav, p-hero/p-body/
   p-outro come from landing/a-base.css + pa-ui.css + pages/page-a.css; only bp-* (post) and bs-* (series) live here. */

.bp-k { margin: 0 0 10px; display: flex; align-items: center; gap: 8px; font: 600 var(--pa-fs-xs) var(--pa-font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--pa-ink-3); }
.bp-k em { font-style: normal; color: var(--pa-link); letter-spacing: 0; }
.bp-root svg, .bp-act svg { width: 15px; height: 15px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* reading progress: a hairline under the nav */
.bp-progress { position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 30; pointer-events: none; }
.bp-progress span { display: block; height: 100%; width: 100%; transform-origin: 0 50%; transform: scaleX(var(--p, 0)); background: linear-gradient(90deg, var(--pa-accent), var(--pa-st-queue)); box-shadow: 0 0 10px var(--pa-run-glow); }

/* ── hero ── */
.bp-hero { min-height: 92vh; }
.bp-crumb { display: flex; align-items: center; gap: 8px; margin: 0 0 18px; font: var(--pa-fs-sm) var(--pa-font-mono); }
.bp-crumb a { color: var(--pa-ink-3); text-decoration: none; }
.bp-crumb a:hover { color: var(--pa-link); }
.bp-crumb i { font-style: normal; color: var(--pa-line-strong); }
.bp-chips { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; margin: 0 0 20px; font: var(--pa-fs-xs) var(--pa-font-mono); letter-spacing: .04em; color: var(--pa-ink-2); }
.bp-chips > span:not(.p-stage) { padding: 4px 9px; border-radius: var(--pa-r-pill); border: var(--pa-bw) solid var(--pa-line); background: color-mix(in srgb, var(--pa-canvas) 50%, transparent); }
.bp-chips > .p-stage + span { margin-left: -2px; }
.bp-h1 { font-size: clamp(34px, 4.2vw, 58px) !important; line-height: 1.06 !important; letter-spacing: -.035em !important; }
.bp-h1 span { display: block; margin-top: 14px; font-size: .5em; line-height: 1.25; letter-spacing: -.02em; font-weight: 600; color: var(--pa-link); }
.bp-hero .p-lead { margin-top: 20px; }
.bp-author { display: flex; align-items: center; gap: 12px; margin-top: 28px; }
.bp-author img { width: 40px; height: 40px; border-radius: 50%; box-shadow: 0 0 0 2px var(--pa-line-strong); }
.bp-author span { display: grid; gap: 2px; }
.bp-author b { color: var(--pa-ink); font-weight: 600; }
.bp-author small { font: var(--pa-fs-sm) var(--pa-font-mono); color: var(--pa-ink-3); }

/* ── body grid: series · article · outline ── */
.bp-body { padding-top: 64px; }
.bp-grid { width: min(1320px, calc(100vw - 48px)); margin: 0 auto; display: grid; grid-template-columns: 232px minmax(0, 700px) 220px; gap: 56px; justify-content: center; }
.bp-left, .bp-right { position: sticky; top: 88px; align-self: start; max-height: calc(100vh - 104px); overflow-y: auto; scrollbar-width: none; }
.bp-left::-webkit-scrollbar, .bp-right::-webkit-scrollbar { display: none; }

.bp-series { padding: 16px; border-radius: var(--pa-r-l); }
.bp-series-t { display: block; color: var(--pa-ink); font-weight: 650; font-size: 16px; line-height: 1.3; text-decoration: none; letter-spacing: -.01em; }
.bp-series-t:hover { color: var(--pa-link); }
.bp-series-n { display: flex; justify-content: space-between; margin: 14px 0 6px; font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); }
.bp-series-n b { color: var(--pa-link); }
.bp-bar { height: 4px; border-radius: var(--pa-r-pill); background: var(--pa-tint-2); overflow: hidden; }
.bp-bar span { display: block; height: 100%; border-radius: inherit; background: var(--pa-accent); }
/* series rail = the same trace rail as Docs: one node per post, the post you are on runs */
.bp-rail { list-style: none; margin: 14px 0 0; padding: 0; }
.bp-rail li { position: relative; }
.bp-rail a, .bp-rail span { position: relative; display: block; padding: 8px 0 8px 30px; font-size: var(--pa-fs); line-height: 1.4; color: var(--pa-ink-3); text-decoration: none; }
.bp-rail a:hover { color: var(--pa-ink); }
.bp-rail i { position: absolute; left: 0; top: 7px; width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font: 600 10px var(--pa-font-mono); font-style: normal; color: var(--pa-ink-3); background: var(--pa-canvas); box-shadow: inset 0 0 0 1.5px var(--pa-line-strong); z-index: 1; }
.bp-rail li + li::before { content: ""; position: absolute; left: 9.5px; top: -12px; height: 20px; width: 1px; background: var(--pa-line); }
.bp-rail li.on span { color: var(--pa-ink); font-weight: 600; }
.bp-rail li.on i { color: var(--pa-on-accent); background: var(--pa-st-running); box-shadow: none; animation: pa-sonar 1.2s var(--pa-ease) infinite; }
.bp-rail li.dim { opacity: .5; }

.bp-main { min-width: 0; }
.bp-deck { margin: 0 0 32px; padding: 0 0 28px; border-bottom: var(--pa-bw) solid var(--pa-line); font-size: 19px; line-height: 1.6; color: var(--pa-ink); text-wrap: pretty; }

.bp-toc { margin-bottom: 26px; }
.bp-toc-list { display: grid; }
.bp-toc-list a { --rail-x: 4px; position: relative; padding: 6px 0 6px 18px; font-size: var(--pa-fs-sm); line-height: 1.4; color: var(--pa-ink-3); text-decoration: none; transition: color var(--pa-dur-1); }
.bp-toc-list a:hover { color: var(--pa-ink); }
.bp-toc-list a::before { content: ""; position: absolute; left: 4px; top: 0; bottom: 0; width: 1px; background: var(--pa-line); }
.bp-toc-list a:first-child::before { top: 50%; }
.bp-toc-list a:last-child::before { bottom: 50%; }
.bp-toc-list a::after { content: ""; position: absolute; left: 1px; top: calc(50% - 3.5px); width: 7px; height: 7px; border-radius: 50%; background: var(--pa-canvas); box-shadow: inset 0 0 0 1.5px var(--pa-ink-3), 0 0 0 3px var(--pa-canvas); transition: background var(--pa-dur-2), box-shadow var(--pa-dur-2); }
.bp-toc-list a.read::after { background: var(--pa-ink-3); }
.bp-toc-list a.on { color: var(--pa-ink); }
.bp-toc-list a.on::after { background: var(--pa-st-running); box-shadow: none; animation: pa-sonar 1.2s var(--pa-ease) infinite; }
.bp-toc-list a.read::before, .bp-toc-list a.on::before { background: var(--pa-accent); }
.bp-toc-list a.on::before { bottom: 50%; }
.bp-toc-list a.on:first-child::before { display: none; }

.bp-acts { display: grid; gap: 6px; }
.bp-acts .bp-k { margin-top: 8px; margin-bottom: 4px; }
.bp-act { all: unset; box-sizing: border-box; cursor: pointer; display: flex; align-items: center; gap: 8px; height: 34px; padding: 0 12px; border-radius: var(--pa-r-s); border: var(--pa-bw) solid var(--pa-line); color: var(--pa-ink-2); font-size: var(--pa-fs); transition: border-color var(--pa-dur-1), color var(--pa-dur-1), background var(--pa-dur-1); }
.bp-act:hover { color: var(--pa-ink); border-color: var(--pa-line-strong); background: var(--pa-tint-1); }
.bp-act.copied { color: var(--pa-link); border-color: color-mix(in oklch, var(--pa-link) 50%, transparent); }
.bp-act-d { margin: 0 0 2px; font-size: var(--pa-fs-sm); line-height: 1.45; color: var(--pa-ink-3); }

.bp-toc-m { display: none; }

/* ── prose (markdown body) ── */
.bp-prose { font-size: 17px; line-height: 1.78; color: var(--pa-ink-2); overflow-wrap: break-word; }
.bp-prose > * { margin: 0 0 1.15em; }
.bp-prose strong { color: var(--pa-ink); font-weight: 650; }
.bp-prose em { color: var(--pa-ink); }
.bp-prose a { color: var(--pa-link); text-decoration: underline; text-decoration-color: color-mix(in oklch, var(--pa-link) 40%, transparent); text-underline-offset: 3px; }
.bp-prose h2 { margin: 2.2em 0 .7em; padding-top: 1.1em; border-top: var(--pa-bw) solid var(--pa-line); font-size: 30px; line-height: 1.2; letter-spacing: -.025em; font-weight: 700; color: var(--pa-ink); scroll-margin-top: 96px; text-wrap: balance; }
.bp-prose > h2:first-child { border-top: 0; padding-top: 0; }
.bp-prose h3 { margin: 1.8em 0 .55em; font-size: 21px; line-height: 1.3; letter-spacing: -.015em; font-weight: 650; color: var(--pa-ink); scroll-margin-top: 96px; }
.bp-prose h4 { margin: 1.5em 0 .5em; font-size: 17px; font-weight: 650; color: var(--pa-ink); }
.bp-prose ul, .bp-prose ol { padding-left: 1.3em; }
.bp-prose li { margin: .35em 0; }
.bp-prose li > ul, .bp-prose li > ol { margin: .3em 0; }
.bp-prose ul > li::marker { color: var(--pa-link); }
.bp-prose ol > li::marker { color: var(--pa-link); font: 600 .85em var(--pa-font-mono); }
.bp-prose blockquote { position: relative; margin: 1.6em 0; padding: 18px 22px 18px 56px; border-radius: var(--pa-r-l); background: var(--pa-accent-tint); color: var(--pa-ink); }
.bp-prose blockquote::before { content: "“"; position: absolute; left: 18px; top: 6px; font: 700 48px/1 Georgia, serif; color: var(--pa-link); }
.bp-prose blockquote p { margin: 0; }
.bp-prose blockquote p + p { margin-top: .6em; }
.bp-prose hr { border: 0; height: 1px; background: var(--pa-line); margin: 2.4em 0; }
.bp-prose img { border-radius: var(--pa-r-l); border: var(--pa-bw) solid var(--pa-line); margin: 1.6em auto; }
.bp-prose iframe { border-radius: var(--pa-r-l); }
.bp-prose > div:has(> iframe) { border-radius: var(--pa-r-l) !important; box-shadow: 0 24px 60px -24px rgba(0, 0, 0, .7), 0 0 0 1px var(--pa-line); }
.bp-prose code { font: .88em var(--pa-font-mono); padding: 2px 6px; border-radius: var(--pa-r-xs); background: var(--pa-tint-2); color: var(--pa-ink); }
.bp-prose pre { margin: 1.4em 0; padding: 16px 18px; overflow-x: auto; border-radius: var(--pa-r-m); background: #12171a !important; border: var(--pa-bw) solid var(--pa-line); font-size: 13.5px; line-height: 1.65; }
.bp-prose pre code { padding: 0; background: none; font-size: inherit; }
.bp-prose table { display: block; width: 100%; max-width: 100%; overflow-x: auto; border-collapse: collapse; font-size: 15px; line-height: 1.55; border: var(--pa-bw) solid var(--pa-line); border-radius: var(--pa-r-m); }
.bp-prose thead th { text-align: left; padding: 10px 14px; font: 600 var(--pa-fs-xs) var(--pa-font-mono); letter-spacing: .04em; color: var(--pa-ink-3); background: var(--pa-tint-1); white-space: nowrap; }
.bp-prose td { padding: 11px 14px; border-top: var(--pa-bw) solid var(--pa-line); vertical-align: top; min-width: 120px; }
.bp-prose td:first-child { color: var(--pa-ink); font-weight: 500; }

/* ── after the body ── */
.bp-take { margin: 48px 0 0; padding: 22px; border-radius: var(--pa-r-l); background: linear-gradient(160deg, color-mix(in oklch, var(--pa-accent) 14%, var(--pa-surface)), var(--pa-surface) 60%); border: var(--pa-bw) solid color-mix(in oklch, var(--pa-link) 28%, transparent); }
.bp-take .bp-k { color: var(--pa-link); }
.bp-take ol { list-style: none; margin: 0; padding: 0; counter-reset: tk; display: grid; gap: 12px; }
.bp-take li { counter-increment: tk; display: grid; grid-template-columns: 32px 1fr; gap: 12px; font-size: 16px; line-height: 1.6; color: var(--pa-ink); }
.bp-take li::before { content: counter(tk, decimal-leading-zero); font: 600 13px var(--pa-font-mono); color: var(--pa-link); padding-top: 3px; }

.bp-apply { margin-top: 32px; }
.bp-apply > p:not(.bp-k) { margin: 0 0 12px; color: var(--pa-ink-2); }
.bp-code { border-radius: var(--pa-r-m); border: var(--pa-bw) solid var(--pa-line); overflow: hidden; }
.bp-code-bar { display: flex; align-items: center; justify-content: space-between; padding: 6px 8px 6px 14px; background: var(--pa-tint-1); font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); }
.bp-code pre { margin: 0; padding: 14px; overflow-x: auto; background: #12171a; font: 13px/1.65 var(--pa-font-mono); color: var(--pa-ink); }

.bp-links { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 32px; }
.bp-links a { display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; padding: 10px 0; border-top: var(--pa-bw) solid var(--pa-line); text-decoration: none; }
.bp-links a b { color: var(--pa-ink); font-weight: 600; grid-column: 2; }
.bp-links a small { color: var(--pa-ink-3); font-size: var(--pa-fs-sm); grid-column: 2; }
.bp-links a .p-stage { grid-row: span 2; }

.bp-byline { display: flex; gap: 16px; margin-top: 48px; padding: 20px; border-radius: var(--pa-r-l); }
.bp-byline img { width: 52px; height: 52px; border-radius: 50%; flex: none; }
.bp-byline-n { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin: 2px 0 8px; }
.bp-byline-n b { color: var(--pa-ink); font-weight: 600; }
.bp-byline-n small { font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); }
.bp-byline blockquote { margin: 0; font-size: 15px; line-height: 1.65; color: var(--pa-ink-2); font-style: italic; }

.bp-rel { margin-top: 40px; }
.bp-rel > div { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }
.bp-rel a { display: grid; gap: 6px; padding: 14px 16px; border-radius: var(--pa-r-m); text-decoration: none; }
.bp-rel small { font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-link); }
.bp-rel b { color: var(--pa-ink); font-weight: 600; line-height: 1.35; }
.bp-rel i { font: normal var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); }

.bp-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 40px; }
.bp-pn a { display: grid; grid-template-columns: 96px 1fr; gap: 14px; align-items: center; padding: 10px; border-radius: var(--pa-r-l); text-decoration: none; transition: border-color var(--pa-dur-2), transform var(--pa-dur-2) var(--pa-ease); }
.bp-pn a:hover { border-color: color-mix(in oklch, var(--pa-link) 45%, transparent); transform: translateY(-2px); }
.bp-pn a.nx { grid-template-columns: 1fr 96px; text-align: right; }
.bp-pn a.nx img { order: 2; }
.bp-pn img { width: 96px; aspect-ratio: 16 / 10; object-fit: cover; border-radius: var(--pa-r-s); }
.bp-pn span { display: grid; gap: 4px; min-width: 0; }
.bp-pn small { font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); }
.bp-pn b { color: var(--pa-ink); font-weight: 600; font-size: var(--pa-fs-md); line-height: 1.35; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.bp-toast { position: fixed; left: 50%; bottom: 28px; z-index: 60; transform: translate(-50%, 16px); opacity: 0; pointer-events: none; padding: 10px 16px; border-radius: var(--pa-r-pill); background: var(--pa-surface); border: var(--pa-bw) solid color-mix(in oklch, var(--pa-link) 45%, transparent); color: var(--pa-ink); font-size: var(--pa-fs); box-shadow: var(--pa-shadow-float); transition: opacity var(--pa-dur-2), transform var(--pa-dur-2) var(--pa-ease); }
.bp-toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ── series hub + series detail ── */
.bs-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 16px; }
.bs-card { position: relative; display: grid; grid-template-rows: auto 1fr auto; gap: 14px; padding: 20px; border-radius: var(--pa-r-l); text-decoration: none; transition: border-color var(--pa-dur-2), transform var(--pa-dur-2) var(--pa-ease); }
.bs-card:hover { border-color: color-mix(in oklch, var(--pa-link) 45%, transparent); transform: translateY(-3px); }
.bs-covers { display: flex; height: 92px; }
.bs-covers img, .bs-covers span { width: 140px; height: 92px; object-fit: cover; border-radius: var(--pa-r-s); border: 2px solid var(--pa-canvas); box-shadow: 0 8px 20px -8px rgba(0, 0, 0, .6); background: var(--pa-tint-2); }
.bs-covers > * + * { margin-left: -56px; transform: rotate(4deg) translateY(4px); }
.bs-covers > * + * + * { transform: rotate(8deg) translateY(8px); }
.bs-card:hover .bs-covers > * + * { transform: rotate(6deg) translate(18px, 4px); }
.bs-covers > * { transition: transform var(--pa-dur-3) var(--pa-ease); }
.bs-card h3 { margin: 6px 0 0; font-size: 22px; line-height: 1.2; letter-spacing: -.02em; color: var(--pa-ink); }
.bs-tag { font: 600 var(--pa-fs-xs) var(--pa-font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--pa-link); }
.bs-card p { margin: 8px 0 0; font-size: var(--pa-fs-md); line-height: 1.55; color: var(--pa-ink-2); }
.bs-foot { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding-top: 14px; border-top: var(--pa-bw) solid var(--pa-line); font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); }
.bs-foot .go { margin-left: auto; color: var(--pa-link); transition: transform var(--pa-dur-2) var(--pa-ease); }
.bs-card:hover .bs-foot .go { transform: translateX(3px); }
.bs-back { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 28px; font: var(--pa-fs-sm) var(--pa-font-mono); }
.bs-back a { color: var(--pa-link); text-decoration: none; }

.bs-who { margin-top: 24px; padding: 16px 18px; border-radius: var(--pa-r-l); max-width: 600px; text-shadow: none; }
.bs-who ul { margin: 0; padding-left: 18px; display: grid; gap: 6px; font-size: var(--pa-fs-md); line-height: 1.55; color: var(--pa-ink-2); }
.bs-who li::marker { color: var(--pa-link); }
.bs-path { list-style: none; margin: 0; padding: 0; display: grid; max-width: 920px; }
.bs-step { position: relative; display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 20px; padding-bottom: 20px; }
.bs-step::before { content: ""; position: absolute; left: 21.5px; top: 46px; bottom: 0; width: 1px; background: var(--pa-line); }
.bs-step:last-child::before { display: none; }
.bs-node { width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; font: 600 15px var(--pa-font-mono); color: var(--pa-link); background: var(--pa-canvas); box-shadow: inset 0 0 0 1.5px color-mix(in oklch, var(--pa-link) 50%, transparent); }
.bs-step.next .bs-node { color: var(--pa-on-accent); background: var(--pa-st-running); box-shadow: none; animation: pa-sonar 1.2s var(--pa-ease) infinite; }
.bs-step.dim { opacity: .5; }
.bs-post { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 20px; align-items: center; padding: 12px; border-radius: var(--pa-r-l); text-decoration: none; transition: border-color var(--pa-dur-2), transform var(--pa-dur-2) var(--pa-ease); }
a.bs-post:hover { border-color: color-mix(in oklch, var(--pa-link) 45%, transparent); transform: translateY(-2px); }
.bs-post img, .bs-post .p-thumb { width: 200px; aspect-ratio: 16 / 10; object-fit: cover; border-radius: var(--pa-r-m); }
.bs-post h3 { margin: 6px 0 0; font-size: 19px; line-height: 1.3; }
.bs-post .p-desc { margin-top: 6px; }

/* ── responsive ── */
@media (max-width: 1240px) {
  .bp-grid { grid-template-columns: minmax(0, 700px) 220px; gap: 48px; }
  .bp-left { position: static; max-height: none; grid-column: 1 / -1; order: -1; }
  .bp-series { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr); gap: 0 28px; max-width: 968px; }
  .bp-series > :not(.bp-rail) { grid-column: 1; }
  .bp-series .bp-rail { grid-column: 2; grid-row: 1 / span 4; margin: 0; }
}
@media (max-width: 960px) {
  .bp-grid { display: block; width: auto; padding: 0 20px; }
  .bp-right { position: static; max-height: none; margin-top: 40px; }
  .bp-toc { display: none; }
  .bp-acts { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
  .bp-acts .bp-k, .bp-act-d { grid-column: 1 / -1; }
  .bp-left { margin-bottom: 28px; }
  .bp-toc-m { display: block; margin: 0 0 28px; border-radius: var(--pa-r-m); border: var(--pa-bw) solid var(--pa-line); background: var(--pa-tint-1); }
  .bp-toc-m summary { cursor: pointer; list-style: none; display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; font-weight: 600; color: var(--pa-ink); }
  .bp-toc-m summary::-webkit-details-marker { display: none; }
  .bp-toc-m summary small { font: var(--pa-fs-xs) var(--pa-font-mono); color: var(--pa-ink-3); }
  .bp-toc-m ol { margin: 0; padding: 0 16px 14px 34px; display: grid; gap: 8px; }
  .bp-toc-m a { color: var(--pa-ink-2); text-decoration: none; font-size: var(--pa-fs-md); line-height: 1.4; }
  .bp-toc-m li::marker { color: var(--pa-link); font-family: var(--pa-font-mono); }
}
@media (max-width: 860px) {
  .bp-hero { padding-top: 80px; }
  .bp-h1 { font-size: 32px !important; }
  .bp-h1 span { font-size: 18px; }
  .bp-body { padding-top: 32px; }
  .bp-grid { padding: 0 16px; }
  .bp-series { display: block; }
  .bp-series .bp-rail { margin-top: 14px; }
  .bp-deck { font-size: 17px; }
  .bp-prose { font-size: 16px; line-height: 1.72; }
  .bp-prose h2 { font-size: 24px; }
  .bp-prose h3 { font-size: 19px; }
  .bp-prose blockquote { padding: 16px 16px 16px 44px; }
  .bp-prose blockquote::before { left: 12px; font-size: 38px; }
  .bp-pn { grid-template-columns: minmax(0, 1fr); }
  .bp-pn a, .bp-pn a.nx { grid-template-columns: 80px 1fr; text-align: left; }
  .bp-pn a.nx img { order: 0; }
  .bp-pn img { width: 80px; }
  .bp-byline { padding: 16px; }
  .bs-grid { grid-template-columns: minmax(0, 1fr); }
  .bs-post { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .bs-post img, .bs-post .p-thumb { width: 100%; }
  .bs-step { grid-template-columns: 32px minmax(0, 1fr); gap: 12px; }
  .bs-node { width: 32px; height: 32px; font-size: 13px; }
  .bs-step::before { left: 15.5px; top: 34px; }
}
@media (prefers-reduced-motion: reduce) { .bp-rail li.on i, .bp-toc-list a.on::after, .bs-step.next .bs-node { animation: none; } }