/* Challenge archive and source reader. Shared navigation and palette live in styles.css. */
.challenge-shell-body { background: var(--bg); }
.challenge-shell-body::after { display: none; }
.challenge-shell-layout { width: min(1400px, 100%); padding: 116px 40px 64px; gap: 44px; grid-template-columns: 210px minmax(0, 1fr); }
.challenge-shell-body .sidebar { background: none; border: 0; top: 100px; max-height: calc(100dvh - 120px); }
.reader-navigation > summary { padding: 0 0 20px; font: 600 12px/1.5 var(--mono); letter-spacing: .04em; }
.reader-navigation[open] > summary { border-bottom: 1px solid var(--border); }
.sidebar-note { background: none; border: 0; padding: 20px 0 4px; font: 11px/1.65 var(--mono); color: var(--muted); }
.side-nav { display: flex; flex-direction: column; gap: 5px; padding: 12px 0 24px; }
.side-nav a { font: 12px/1.6 var(--reading, system-ui, sans-serif); letter-spacing: 0; padding: 9px 12px; border-radius: 4px; }
.side-nav a:hover { color: var(--accent); border-left-color: var(--accent); background: color-mix(in srgb, var(--accent) 5%, transparent); transform: none; }
.collection-link { display: flex; justify-content: space-between; gap: 8px; }
.side-nav a[aria-current="page"] { color: var(--accent); border-left-color: var(--accent); background: color-mix(in srgb, var(--accent) 6%, transparent); }
.collection-link span { color: var(--muted); font: 10px/1.9 var(--mono); }
.sidebar-links { padding: 20px 0; gap: 16px; }
.sidebar-links a { font: 10px/1.8 var(--mono); letter-spacing: .04em; }
.nav-folder { padding: 14px 0 0; margin: 12px 0 0; border: 0; border-top: 1px solid var(--border); background: none; }
.nav-folder summary { padding: 8px 0 12px; font-size: 10px; letter-spacing: .07em; color: var(--muted); }
.nav-folder-content { gap: 5px; padding: 0; }
.side-nav a.challenge-link { padding: 9px 8px 9px 28px; border: 0; background: none; font: 12px/1.6 var(--reading, system-ui, sans-serif); }
.side-nav a.challenge-link::before { left: 0; top: 12px; font: 10px/1.5 var(--mono); color: var(--muted); }
.side-nav a.challenge-link-current, .side-nav a.challenge-link-current::before { color: var(--accent); }
.reader-breadcrumb { margin: 0 0 32px; gap: 10px; align-items: center; font: 10px/1.8 var(--mono); color: var(--muted); }
.reader-breadcrumb a { color: var(--muted); text-decoration: none; }
.reader-breadcrumb a:hover { color: var(--accent); }
.reader-breadcrumb span:last-child { overflow-wrap: anywhere; }
.challenge-shell-body .section { background: none; border: 0; padding: 0; margin: 0 0 48px; }
.challenge-shell-body .comp-hero { padding: 0 0 40px !important; background: none; border-bottom: 1px solid var(--border); margin-bottom: 0 !important; }
.comp-hero-crop, .comp-hero-ghost, .hex-ruler, .edge-tag { display: none; }
.challenge-shell-body .comp-hero-index { color: var(--accent); font: 10px/1.7 var(--mono); letter-spacing: .12em; margin-bottom: 28px; }
.comp-hero-index::after { display: none; }
.challenge-shell-body .comp-hero-title { font: 700 clamp(36px, 4.5vw, 64px)/1.07 var(--sans); letter-spacing: -.045em; max-width: 15ch; margin-bottom: 24px; overflow-wrap: normal; }
.challenge-shell-body .archive-hero .comp-hero-title { max-width: 16ch; font-size: clamp(44px, 5.5vw, 78px); }
.challenge-shell-body .challenge-page-header > p.muted { font: 16px/1.8 var(--reading, system-ui, sans-serif); color: var(--muted); max-width: 64ch; }
.archive-metrics { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 40px; gap: 24px; max-width: 600px; }
.archive-metrics > div { display: flex; flex-direction: column-reverse; gap: 8px; padding-left: 20px; border-left: 1px solid var(--border2); }
.archive-metrics > div:first-child { padding-left: 0; border-left: 0; }
.archive-metrics dt { color: var(--muted); font: 10px/1.5 var(--mono); letter-spacing: .035em; }
.archive-metrics dd { color: var(--text); font: 600 32px/1 var(--sans); letter-spacing: -.04em; }
.challenge-shell-body .writeup-index { padding-top: 40px; }
.archive-section-heading { display: flex; gap: 20px; align-items: flex-end; justify-content: space-between; }
.reader-label { display: block; font: 10px/1.7 var(--mono) !important; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin: 0 0 10px; }
.challenge-shell-body .section h2 { font: 600 clamp(23px, 2.5vw, 32px)/1.25 var(--sans); letter-spacing: -.035em; margin: 0 0 14px; }
.archive-section-heading h2 { margin-bottom: 0 !important; }
.archive-start { font: 11px/1.7 var(--mono); text-decoration: none; color: var(--accent); white-space: nowrap; padding-bottom: 3px; }
.archive-start:hover { text-decoration: underline; }
.writeup-filters { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px 16px; padding: 28px 0 0; margin: 0; }
.writeup-filters label { font: 11px/1.5 var(--reading, system-ui, sans-serif); gap: 9px; color: var(--muted); }
.writeup-search-field { grid-column: 1/-1; }
.writeup-filters input, .writeup-filters select { border: 1px solid var(--border2); border-radius: 5px; background: var(--bg2); min-height: 48px; padding: 12px 14px; color: var(--text); font: 14px/1.5 var(--reading, system-ui, sans-serif); }
.writeup-filters input::placeholder { color: var(--muted); opacity: .85; }
.writeup-filters input:focus-visible, .writeup-filters select:focus-visible { outline-width: 2px; outline-offset: 3px; }
.filter-footer { grid-column: 1/-1; display: flex; justify-content: space-between; align-items: center; gap: 16px; padding-top: 0; }
#filter-status { font: 11px/1.6 var(--mono); color: var(--muted); }
.filter-footer .btn { background: none; border: 0; color: var(--muted); padding: 8px 0 8px 12px; font: 11px/1.6 var(--mono); text-transform: none; letter-spacing: 0; min-height: 40px; }
.filter-footer .btn:hover { color: var(--accent); }
.writeup-grid { gap: 16px; margin-top: 20px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.writeup-card { border: 1px solid var(--border2); border-radius: 7px; background: var(--bg2); padding: 26px; gap: 0; text-decoration: none; transition: transform 180ms, border-color 180ms; }
.writeup-card:hover { transform: translateY(-3px); border-color: var(--accent); text-decoration: none; }
.writeup-card-top { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-bottom: 28px; }
.writeup-card-meta { color: var(--muted); font: 9px/1.7 var(--mono); letter-spacing: .02em; }
.writeup-card-number { font: 10px/1.5 var(--mono); color: var(--muted); opacity: .8; }
.writeup-card h3 { font: 600 clamp(22px, 2vw, 27px)/1.2 var(--sans); letter-spacing: -.03em; margin: 0 0 15px; max-width: 22ch; }
.writeup-card p { font: 14px/1.75 var(--reading, system-ui, sans-serif); color: var(--muted); margin: 0 0 24px; }
.technique-tags { display: flex; flex-wrap: wrap; gap: 7px; }
.technique-tag { padding: 4px 8px; border: 1px solid var(--border2); border-radius: 3px; color: var(--muted); font: 9px/1.5 var(--mono); text-decoration: none; background: color-mix(in srgb, var(--text) 2%, transparent); }
.technique-tag:hover { border-color: var(--accent); color: var(--accent); }
.writeup-card .technique-tags { margin-top: auto; margin-bottom: 24px; }
.writeup-card .technique-tag:hover { border-color: var(--border2); color: var(--muted); }
.writeup-card-footer { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; padding-top: 18px; border-top: 1px solid var(--border); }
.difficulty-badge { display: inline-flex; align-items: center; gap: 7px; font: 10px/1.5 var(--mono); color: var(--text); }
.difficulty-badge::before { content: ''; width: 5px; height: 5px; border-radius: 50%; background: currentColor; }
.difficulty-easy { color: #b7ed69; }.difficulty-medium { color: #e3c36a; }.difficulty-hard { color: #f29f99; }
.writeup-file-count { color: var(--muted); font: 10px/1.5 var(--mono); }
.writeup-card-cta { color: var(--accent); font: 10px/1.5 var(--mono); margin-left: auto; }
.writeup-empty { grid-column: 1/-1; border: 1px dashed var(--border2); border-radius: 7px; padding: 48px 24px; text-align: center; }
.writeup-empty h3 { font: 600 22px/1.3 var(--sans); margin-bottom: 12px; }
.writeup-empty p { font: 15px/1.7 var(--reading, system-ui, sans-serif); color: var(--muted); margin-bottom: 24px; }
.inline-browser { padding-top: 24px; border-top: 1px solid var(--border); }
.inline-browser > summary { font: 600 20px/1.5 var(--sans); padding: 20px 0; letter-spacing: -.025em; }
.inline-browser > p { font: 14px/1.8 var(--reading, system-ui, sans-serif); max-width: 65ch; }
.challenge-workspace { grid-template-columns: 190px minmax(0, 1fr); gap: 20px; }
.challenge-list-pane { padding: 8px; background: none; border-radius: 5px; top: 100px; }
.challenge-inline-link { padding: 12px 8px 12px 29px; border: 0; background: none; display: flex; flex-direction: column; gap: 6px; font: 12px/1.6 var(--reading, system-ui, sans-serif); }
.challenge-inline-link::before { left: 7px; top: 15px; font: 9px/1.6 var(--mono); color: var(--muted); }
.challenge-inline-link:hover { transform: none; background: var(--bg2); }
.challenge-inline-link.challenge-link-current { background: var(--bg3); color: var(--accent); }
.challenge-inline-link .link-meta { font: 9px/1.5 var(--mono); letter-spacing: 0; }
.challenge-viewer-pane { border: 0; padding: 0; background: none; }
.challenge-inline-header { padding: 4px 0 24px; }
.challenge-inline-header h3 { font: 600 25px/1.3 var(--sans); }
.challenge-inline-header .meta { font: 10px/1.8 var(--mono); }
.challenge-inline-header .muted { font: 14px/1.75 var(--reading, system-ui, sans-serif); }
.inline-reader-link { font: 10px/1.5 var(--mono); text-decoration: none; display: inline-block; padding-block: 8px; }
.file-tabs { gap: 8px; margin-bottom: 16px; }
.file-tab { font: 10px/1.6 var(--mono); padding: 10px 12px; border-radius: 4px; min-height: 40px; background: var(--bg2); }
.file-tab.active { color: var(--bg); background: var(--accent); border-color: var(--accent); }
.reader-actions { gap: 10px; margin-top: 28px; }
.reader-actions .btn { font: 10px/1.6 var(--mono); text-transform: none; letter-spacing: .02em; min-height: 44px; padding: 12px 16px; border-radius: 4px; }
.challenge-page-header .meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 20px; font: 11px/1.8 var(--mono); color: var(--muted); }
.challenge-page-header .meta a { color: var(--muted); text-decoration: none; }
.challenge-page-header .meta a:hover { color: var(--accent); }
.meta-separator { opacity: .6; }
.reader-category { color: var(--muted); }
#challenge-techniques { min-height: 28px; }
.reader-overview { display: flex; justify-content: space-between; gap: 24px; padding: 24px 0; margin-bottom: 40px; border-bottom: 1px solid var(--border); }
.reader-overview .technique-tag { padding: 5px 9px; font-size: 10px; }
.reader-file-total { display: flex; flex-direction: column; flex-shrink: 0; }
#challenge-file-count { font: 12px/1.8 var(--reading, system-ui, sans-serif); color: var(--text); }
.challenge-shell-body #reader-files > p.muted { font: 15px/1.8 var(--reading, system-ui, sans-serif); max-width: 66ch; }
#article-contents { display: block; margin: 28px 0 20px; padding: 24px; border: 1px solid var(--border2); border-radius: 6px; background: var(--bg2); }
#article-contents > h3 { font: 600 11px/1.5 var(--mono); letter-spacing: .02em; margin-bottom: 20px; color: var(--muted); }
#article-contents > ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); list-style: none; gap: 18px 24px; padding: 0; margin: 0; counter-reset: file; }
#article-contents > ol > li { position: relative; counter-increment: file; padding-left: 26px; }
#article-contents > ol > li::before { content: counter(file, decimal-leading-zero); font: 9px/1.8 var(--mono); color: var(--muted); position: absolute; left: 0; top: 2px; }
.contents-file { min-height: 32px; display: flex; flex-direction: column; gap: 3px; text-decoration: none; }
#article-contents .contents-file { font: 11px/1.7 var(--mono); color: var(--text); }
.contents-role { font: 9px/1.6 var(--mono); color: var(--accent); }
.contents-headings { margin-top: 7px; }
.contents-headings summary { min-height: 32px; padding-block: 5px; font: 9px/1.7 var(--mono); color: var(--muted); cursor: pointer; }
#article-contents .contents-headings ul { padding-left: 14px; display: grid; gap: 6px; }
#article-contents .contents-headings a { font: 10px/1.7 var(--reading, system-ui, sans-serif); color: var(--muted); }
.reader-context { margin-bottom: 28px; padding-left: 14px; border-left: 2px solid var(--border2); font: 12px/1.8 var(--reading, system-ui, sans-serif); color: var(--muted); max-width: 80ch; }
.reader-loading { font: 13px/1.8 var(--mono); color: var(--muted); padding: 28px 0; }
.code-section { margin: 28px 0 0; background: var(--bg2); border: 1px solid var(--border2); border-radius: 6px; box-shadow: none; scroll-margin-top: 96px; }
.code-section-header { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; background: var(--bg3); padding: 18px 22px; }
.code-section-header::before { display: none; }
.file-role { color: var(--accent); font: 9px/1.6 var(--mono); text-transform: uppercase; letter-spacing: .06em; flex-basis: 100%; }
.code-section-title { font: 600 14px/1.5 var(--mono); letter-spacing: -.02em; overflow-wrap: anywhere; }
.code-section-lang { color: var(--muted); font: 9px/1.7 var(--mono); border: 1px solid var(--border2); border-radius: 3px; padding: 2px 6px; text-transform: none; letter-spacing: 0; }
.source-download { margin-left: auto; font: 10px/1.8 var(--mono); color: var(--accent); text-decoration: none; }
.source-download:hover { text-decoration: underline; }
.code-actions { padding: 10px 18px; gap: 10px; border-bottom: 1px solid var(--border); }
.source-line-count { font: 9px/1.8 var(--mono); color: var(--muted); margin-right: auto; }
.code-actions .btn { margin: 0; min-height: 36px; padding: 7px 10px; border-radius: 3px; border-color: var(--border2); font: 9px/1.8 var(--mono); letter-spacing: 0; text-transform: none; }
.code-wrap[aria-pressed="true"] { color: var(--accent); border-color: var(--accent); }
.code-actions .source-download { margin-left: 2px; font-size: 9px; }
.code-block { max-width: 100%; padding: 20px 0; font: 12px/1.85 var(--mono); background: var(--bg); overflow: auto; }
.code-block code { display: block; min-width: max-content; font: inherit; }
.code-line { display: block; position: relative; white-space: pre; padding: 0 22px 0 54px; min-height: 1.85em; }
.code-line::before { width: 39px; padding-right: 10px; color: #84908f; border-right: 1px solid var(--border); font: inherit; user-select: none; }
.lines-wrapped .code-block code { min-width: 0; }
.lines-wrapped .code-line { white-space: pre-wrap; overflow-wrap: anywhere; }
.writeup-prose { font: 16px/1.85 var(--reading, system-ui, sans-serif); padding: 28px 32px 36px; max-width: 76ch; margin-inline: auto; color: var(--muted); overflow-wrap: anywhere; }
.writeup-prose h1 { font: 600 clamp(24px, 2.7vw, 34px)/1.2 var(--sans); letter-spacing: -.035em; color: var(--text); margin: 0 0 24px; }
.writeup-prose h2 { font: 600 23px/1.3 var(--sans) !important; color: var(--text); margin: 36px 0 16px !important; letter-spacing: -.025em; }
.writeup-prose h3 { font: 600 19px/1.4 var(--sans); color: var(--text); margin: 28px 0 14px; }
.writeup-prose .prose-heading-1 { font: 600 clamp(24px, 2.7vw, 34px)/1.2 var(--sans); letter-spacing: -.035em; color: var(--text); margin: 0 0 24px; }
.writeup-prose .prose-heading-2 { font: 600 23px/1.3 var(--sans); color: var(--text); margin: 36px 0 16px; letter-spacing: -.025em; }
.writeup-prose .prose-heading-3 { font: 600 19px/1.4 var(--sans); color: var(--text); margin: 28px 0 14px; }
.writeup-prose strong { color: var(--text); font-weight: 600; }
.writeup-prose p, .writeup-prose ul, .writeup-prose ol { margin: 16px 0; }
.writeup-prose li { margin: 5px 0; }
.writeup-prose :not(pre) > code { font: .8em/1.5 var(--mono); color: var(--text); background: var(--bg3); padding: 3px 6px; border: 1px solid var(--border); border-radius: 3px; }
.writeup-prose blockquote { border-left: 2px solid var(--accent); padding: 4px 0 4px 20px; color: var(--muted); margin: 24px 0; }
.writeup-prose a { text-underline-offset: .2em; }
.writeup-prose pre { font: 11px/1.85 var(--mono); padding: 18px 0; border: 1px solid var(--border); border-radius: 4px; }
.writeup-prose .markdown-copy { font: 9px/1.7 var(--mono); min-height: 36px; padding: 8px 10px; margin-top: 12px; margin-bottom: 8px; letter-spacing: 0; text-transform: none; }
.writeup-prose table { margin: 24px 0; font-size: 14px; }
.writeup-prose th { background: var(--bg3); color: var(--text); text-align: left; }
.writeup-prose img { border-radius: 4px; height: auto; }
.writeup-prose [id] { scroll-margin-top: 96px; }
.file-error { padding: 24px; color: var(--muted); font: 14px/1.8 var(--reading, system-ui, sans-serif); }
.file-error .code-actions { border: 0; padding: 14px 0 0; }
.writeup-pagination { margin: 40px 0 0; gap: 16px; }
.writeup-pagination a { display: flex; flex-direction: column; flex: 1; padding: 22px; border: 1px solid var(--border2); border-radius: 5px; gap: 8px; background: var(--bg2); color: var(--text); }
.writeup-pagination a > span { font: 9px/1.7 var(--mono); color: var(--muted); }
.writeup-pagination strong { font: 600 16px/1.5 var(--sans); }
.writeup-pagination .pagination-next { text-align: right; }
.clipboard-fallback { position: fixed; top: 0; left: -9999px; }
.visually-hidden { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; border: 0; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

@media (max-width: 1180px) {
  .challenge-shell-layout { gap: 28px; padding-inline: 28px; grid-template-columns: 185px minmax(0, 1fr); }
  .writeup-card { padding: 22px; }
  .writeup-card-cta { flex-basis: 100%; margin-left: 0; }
  .challenge-workspace { grid-template-columns: minmax(0, 1fr); }
  .challenge-list-pane { position: static; max-height: 260px; }
  .challenge-list-pane .list-links { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .challenge-shell-layout { grid-template-columns: minmax(0, 1fr); padding: 96px 28px 48px; gap: 28px; max-width: 850px; }
  .challenge-shell-body .sidebar { position: static; max-height: none; max-width: none; border-block: 1px solid var(--border); }
  .reader-navigation > summary { padding: 13px 0; font-size: 11px; }
  .reader-navigation .sidebar-note, .reader-navigation .sidebar-links { display: none; }
  .reader-navigation .side-nav { padding-block: 16px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .reader-navigation .nav-folder { grid-column: 1/-1; }
  #sidebar-challenge-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  #sidebar-challenge-nav a.challenge-link { white-space: normal; overflow: visible; display: block; }
  #sidebar-challenge-nav a.challenge-link::before { top: 12px; transform: none; }
  .reader-breadcrumb { margin-bottom: 24px; }
  .challenge-shell-body .comp-hero-title { font-size: clamp(36px, 6.5vw, 58px); max-width: 18ch; }
  .challenge-shell-body .archive-hero .comp-hero-title { font-size: clamp(44px, 8vw, 68px); }
}
@media (max-width: 620px) {
  .challenge-shell-layout { width: 100%; padding: 88px 20px 40px; gap: 24px; }
  .reader-navigation > summary { font-size: 10px; }
  .reader-navigation .side-nav { grid-template-columns: minmax(0, 1fr); }
  #sidebar-challenge-nav { grid-template-columns: minmax(0, 1fr); }
  .reader-breadcrumb { font-size: 9px; gap: 7px; margin-bottom: 24px; }
  .reader-breadcrumb span:last-child { flex-basis: 100%; }
  .reader-breadcrumb span:last-child:empty { display: none; }
  .challenge-shell-body .comp-hero { padding: 0 0 28px !important; max-width: none; }
  .challenge-shell-body .comp-hero-index { font-size: 9px; letter-spacing: .08em; margin-bottom: 20px; }
  .challenge-shell-body .comp-hero-title { font-size: clamp(32px, 8.5vw, 46px); letter-spacing: -.04em; margin-bottom: 20px; }
  .challenge-shell-body .archive-hero .comp-hero-title { font-size: clamp(38px, 11vw, 62px); }
  .challenge-shell-body .challenge-page-header > p.muted { font-size: 15px; }
  .archive-metrics { margin-top: 28px; gap: 12px; }
  .archive-metrics > div { padding-left: 12px; }
  .archive-metrics dd { font-size: 28px; }
  .archive-metrics dt { font-size: 8px; }
  .challenge-shell-body .section { margin-bottom: 36px; max-width: none; }
  .challenge-shell-body .writeup-index { padding-top: 28px; }
  .archive-section-heading { align-items: flex-start; flex-direction: column; gap: 12px; }
  .reader-label { font-size: 9px !important; }
  .challenge-shell-body .section h2 { font-size: 25px; }
  .archive-start { font-size: 10px; padding: 4px 0; }
  .writeup-filters { gap: 18px 12px; padding-top: 22px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .writeup-filters > label:last-of-type { grid-column: 1/-1; }
  .writeup-filters input, .writeup-filters select { font-size: 16px; padding-inline: 11px; }
  .writeup-filters input { font-size: 16px; }
  .filter-footer { margin-top: -5px; }
  .writeup-grid { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .writeup-card { padding: 24px; }
  .writeup-card-top { margin-bottom: 24px; }
  .writeup-card h3 { font-size: 26px; }
  .writeup-card-cta { flex-basis: auto; margin-left: auto; }
  .writeup-card p { font-size: 14px; }
  .writeup-card-meta { font-size: 9px; }
  .writeup-card .technique-tag { font-size: 9px; }
  .challenge-page-header .meta { gap: 9px; font-size: 9px; }
  .challenge-page-header .meta .difficulty-badge { font-size: 9px; }
  .reader-actions { gap: 8px; margin-top: 24px; }
  .reader-actions .btn { font-size: 9px; padding: 11px 12px; }
  .reader-actions .btn-primary { flex-basis: 100%; justify-content: center; }
  .reader-overview { flex-direction: column; gap: 20px; padding: 22px 0; margin-bottom: 28px; }
  .reader-overview .technique-tag { font-size: 9px; }
  .reader-file-total { flex-direction: row; align-items: baseline; gap: 12px; }
  .reader-file-total .reader-label { margin: 0; }
  #challenge-file-count { font-size: 11px; }
  #article-contents { padding: 20px; margin-top: 22px; }
  #article-contents > ol { grid-template-columns: minmax(0, 1fr); gap: 15px; }
  .contents-file { flex-direction: row; justify-content: space-between; gap: 14px; align-items: baseline; }
  #article-contents .contents-file { font-size: 10px; }
  .contents-role { flex-shrink: 0; font-size: 9px; }
  #article-contents > ol > li { padding-left: 25px; }
  .reader-context { font-size: 12px; margin-bottom: 24px; }
  .code-section { border-radius: 5px; margin-top: 22px; }
  .code-section-header { padding: 16px; gap: 9px; }
  .code-section-title { font-size: 12px; }
  .code-section-lang { font-size: 8px; }
  .source-download { font-size: 9px; }
  .code-actions { padding: 10px 12px; gap: 7px; }
  .source-line-count { flex-basis: 100%; margin-bottom: 2px; }
  .code-actions .btn { padding: 6px 8px; }
  .code-actions .source-download { margin-left: auto; }
  .code-block { font-size: 12px; }
  .code-line { padding-left: 44px; padding-right: 16px; }
  .code-line::before { width: 33px; padding-right: 8px; }
  .writeup-prose { padding: 24px 20px 28px; font-size: 15px; }
  .writeup-prose h1 { font-size: 26px; }
  .writeup-prose h2 { font-size: 22px !important; }
  .writeup-prose h3 { font-size: 19px; }
  .writeup-prose .prose-heading-1 { font-size: 26px; }
  .writeup-prose .prose-heading-2 { font-size: 22px; }
  .writeup-pagination { flex-direction: column; margin-top: 28px; gap: 12px; }
  .writeup-pagination a { padding: 20px; }
  .challenge-list-pane .list-links { grid-template-columns: minmax(0, 1fr); }
  #competition-challenge-list button.challenge-link { display: flex; white-space: normal; overflow: visible; }
  #competition-challenge-list button.challenge-link .link-meta { display: inline; }
  #competition-challenge-list button.challenge-link::before { top: 15px; transform: none; }
  .inline-browser > summary { font-size: 20px; }
  .inline-browser > p { font-size: 14px; }
  .challenge-workspace, .challenge-viewer-pane, .challenge-list-pane { max-width: 100%; }
  .inline-reader-link { font-size: 10px; }
}
@media (prefers-reduced-motion: reduce) {
  .writeup-card:hover { transform: none; }
  .writeup-card { transition: none; }
}