:root {
  --navy: #102a43;
  --navy-deep: #081b2d;
  --blue: #1d6fa5;
  --blue-bright: #2f8dcc;
  --ink: #183047;
  --muted: #607589;
  --paper: #f7f9fb;
  --surface: #ffffff;
  --surface-soft: #edf3f8;
  --line: #d9e3eb;
  --line-strong: #b9cbd8;
  --accent-soft: #dceefa;
  --warm: #e5b75d;
  --danger: #c85c55;
  --shadow: 0 12px 35px rgba(16, 42, 67, .08);
  --shadow-small: 0 4px 14px rgba(16, 42, 67, .07);
  --font-display: 'Libre Baskerville', serif;
  --font-body: 'Nunito Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --shell: min(88vw, 1420px);
  --gutter: clamp(1rem, 2.2vw, 2rem);
  --radius: 5px;
}

html[data-theme="dark"], html.dark {
  --navy: #9ed4f4;
  --navy-deep: #061521;
  --blue: #70b9e9;
  --blue-bright: #99d5fa;
  --ink: #e7f0f6;
  --muted: #abc0cf;
  --paper: #0c202f;
  --surface: #112b3d;
  --surface-soft: #18384e;
  --line: #2c4c61;
  --line-strong: #45697f;
  --accent-soft: #173c55;
  --warm: #f0c978;
  --danger: #f08c80;
  --shadow: 0 14px 36px rgba(0, 0, 0, .22);
  --shadow-small: 0 5px 16px rgba(0, 0, 0, .2);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(47, 141, 204, .09), transparent 27rem),
    linear-gradient(180deg, var(--paper) 0%, var(--paper) 78%, var(--surface-soft) 100%);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  overflow-x: hidden;
}
a { color: var(--blue); text-decoration-thickness: .08em; text-underline-offset: .15em; }
a:hover { color: var(--blue-bright); }
button, input { font: inherit; }
button { cursor: pointer; }
img { max-width: 100%; }

.site-frame { width: var(--shell); margin: 0 auto; }
.utility-strip {
  min-height: 2.35rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .45rem .9rem;
  color: #e8f4fb;
  background: var(--navy-deep);
  font-size: .76rem;
  letter-spacing: .055em;
  text-transform: uppercase;
}
.utility-strip a { color: #d5ebf8; text-decoration: none; }
.utility-strip a:hover { color: #fff; }
.utility-mark { font-weight: 800; letter-spacing: .09em; }
.utility-links { display: flex; align-items: center; gap: 1rem; }
.utility-links a::before { content: '/'; margin-right: .45rem; color: var(--warm); }

.main-header {
  position: relative;
  z-index: 5;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 5px 18px rgba(16, 42, 67, .04);
}
.header-row {
  min-height: 5.5rem;
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2.6rem);
  padding: .75rem 1rem;
}
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  color: var(--navy);
  text-decoration: none;
  white-space: nowrap;
}
.brand-mark {
  width: 2.75rem;
  height: 2.75rem;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--blue);
  border-radius: 4px 12px 4px 12px;
  box-shadow: 5px 5px 0 var(--accent-soft);
}
.brand-mark svg { width: 1.65rem; height: 1.65rem; }
.brand-name { font-family: var(--font-display); font-size: clamp(1.25rem, 2vw, 1.6rem); font-weight: 700; letter-spacing: -.035em; }
.brand-sub { display: block; margin-top: -.1rem; color: var(--muted); font-size: .7rem; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: .55rem; }
.header-search { display: flex; align-items: center; width: clamp(15rem, 24vw, 22rem); border: 1px solid var(--line-strong); border-radius: 3px; background: var(--surface); }
.header-search:focus-within { outline: 3px solid var(--accent-soft); border-color: var(--blue); }
.header-search input { width: 100%; min-width: 0; padding: .62rem .75rem; color: var(--ink); border: 0; outline: 0; background: transparent; }
.header-search button { width: 2.6rem; height: 2.6rem; flex: 0 0 2.6rem; color: var(--blue); border: 0; border-left: 1px solid var(--line); background: transparent; }
.header-search button svg { width: 1.05rem; height: 1.05rem; }
.chrome-cluster { display: flex; align-items: center; gap: .35rem; margin-left: .35rem; }
[data-theme-toggle], .menu-toggle { width: 2.55rem; height: 2.55rem; display: grid; place-items: center; border: 1px solid var(--line-strong); border-radius: 3px; color: var(--navy); background: var(--surface); }
[data-theme-toggle] { position: relative; color: var(--blue); }
[data-theme-toggle]::after { content: ''; position: absolute; width: .35rem; height: .35rem; top: .4rem; right: .42rem; border-radius: 50%; background: var(--warm); }
[data-theme-toggle] svg, .menu-toggle svg { width: 1.1rem; height: 1.1rem; }
[data-theme-toggle]:hover, .menu-toggle:hover { color: var(--blue-bright); border-color: var(--blue); background: var(--accent-soft); }
.menu-toggle { display: none; }
.primary-nav { border-top: 1px solid var(--line); }
.nav-inner { display: flex; align-items: center; gap: .2rem; padding: .35rem 1rem; }
.primary-nav a { padding: .55rem .75rem; color: var(--ink); font-size: .86rem; font-weight: 800; text-decoration: none; }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { color: var(--blue); background: var(--accent-soft); }
.topic-strip { display: flex; align-items: center; gap: .45rem; padding: .55rem 1rem .7rem; overflow-x: auto; scrollbar-width: none; }
.topic-strip::-webkit-scrollbar { display: none; }
.topic-chip { flex: 0 0 auto; padding: .22rem .6rem; color: var(--muted); border: 1px solid var(--line); border-radius: 99px; font-size: .73rem; font-weight: 700; text-decoration: none; }
.topic-chip:hover { color: var(--blue); border-color: var(--blue); background: var(--accent-soft); }

main { padding: 2.2rem 0 4rem; }
.page-shell { width: var(--shell); margin: 0 auto; }
.rail-layout { display: grid; grid-template-columns: minmax(0, 1fr) 11.5rem; gap: 1.4rem; align-items: start; }
.rail-layout:has([data-side-links][hidden]), .rail-layout:has([data-side-links]:empty) { grid-template-columns: minmax(0, 1fr); }
[data-side-links][hidden], [data-side-links]:empty { display: none; }
.side-links { position: sticky; top: 1rem; padding: 1rem; color: var(--ink); border-top: 3px solid var(--blue); background: var(--surface); box-shadow: var(--shadow-small); }
.side-links h2 { margin: 0 0 .7rem; color: var(--navy); font-family: var(--font-display); font-size: .98rem; }
.side-links ol { margin: 0; padding-left: 1.2rem; }
.side-links li { margin: .55rem 0; padding-left: .1rem; font-size: .8rem; }
.side-links a { color: var(--ink); }

.eyebrow { display: flex; align-items: center; gap: .65rem; margin: 0 0 .55rem; color: var(--blue); font-size: .72rem; font-weight: 900; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow::before { content: ''; width: 1.8rem; height: 2px; background: var(--warm); }
h1, h2, h3, h4 { margin: 0; color: var(--navy); line-height: 1.14; }
h1, h2 { font-family: var(--font-display); letter-spacing: -.035em; }
h1 { font-size: clamp(2rem, 4vw, 3.8rem); }
h2 { font-size: clamp(1.45rem, 2.6vw, 2.15rem); }
h3 { font-size: 1.08rem; }
p { margin: 0; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; padding-bottom: .65rem; border-bottom: 2px solid var(--navy); }
.section-heading h2 { font-size: clamp(1.25rem, 2vw, 1.7rem); }
.section-heading a { flex: 0 0 auto; font-size: .78rem; font-weight: 800; }

.home-intro { display: flex; align-items: end; justify-content: space-between; gap: 2rem; margin-bottom: 1.45rem; }
.home-intro-copy { max-width: 48rem; }
.home-intro h1 { max-width: 18ch; }
.home-intro .dek { max-width: 43rem; margin-top: .75rem; color: var(--muted); font-size: 1.06rem; }
.issue-note { flex: 0 0 11rem; padding: .7rem .85rem; border-left: 3px solid var(--warm); color: var(--muted); font-size: .75rem; }
.issue-note strong { display: block; margin-bottom: .2rem; color: var(--ink); font-family: var(--font-mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; }

.desk-fold { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(15rem, .85fr) minmax(12rem, .62fr); gap: 1.15rem; align-items: stretch; }
.desk-column { min-width: 0; display: flex; flex-direction: column; min-height: 100%; }
.zone-label { display: flex; align-items: center; justify-content: space-between; min-height: 2.2rem; margin-bottom: .65rem; padding-bottom: .45rem; border-bottom: 1px solid var(--line-strong); color: var(--muted); font-family: var(--font-mono); font-size: .67rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase; }
.zone-label span:last-child { color: var(--blue); }
.desk-column [data-feed] { min-height: 0; }

.news-grid { min-width: 0; display: grid; gap: 1rem; }
.fold-lead { flex: 0 0 auto; }
.fold-lead.news-grid { grid-template-columns: minmax(0, 1fr); }
.fold-lead .story-card { display: flex; flex-direction: column; padding: 0 0 1rem; border-bottom: 1px solid var(--line-strong); }
.fold-lead .story-image { order: -1; display: block; position: relative; aspect-ratio: 16 / 9; overflow: hidden; margin-bottom: .8rem; background: var(--surface-soft); }
.fold-lead .story-image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.fold-lead .story-card h3 { font-size: clamp(1.45rem, 2.3vw, 2.1rem); }
.story-meta { display: flex; flex-wrap: wrap; align-items: center; gap: .3rem .65rem; margin-bottom: .4rem; color: var(--muted); font-family: var(--font-mono); font-size: .66rem; line-height: 1.3; text-transform: uppercase; }
.category-label { color: var(--blue); font-weight: 800; }
.story-card h3 { font-family: var(--font-display); }
.story-card h3 a { color: var(--navy); text-decoration: none; }
.story-card h3 a:hover { color: var(--blue); }
.story-card p { margin-top: .45rem; color: var(--muted); font-size: .88rem; line-height: 1.45; }
.empty-state { padding: 1rem; color: var(--muted); border: 1px dashed var(--line-strong); background: var(--surface); font-size: .84rem; }

.support-feed { flex: 1 1 auto; display: grid; grid-template-columns: 1fr; gap: 0; border-top: 1px solid var(--line); overflow: hidden; }
.support-feed .story-card { display: grid; grid-template-columns: minmax(0, 1fr); gap: .25rem; align-content: start; padding: .78rem 0; border-bottom: 1px solid var(--line); }
.support-feed .story-image { display: block; position: relative; aspect-ratio: 3 / 1; overflow: hidden; margin-bottom: .3rem; background: var(--surface-soft); }
.support-feed .story-image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.support-feed .story-card h3 { font-size: 1.05rem; }
.support-feed .story-card p { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }
.utility-feed { flex: 1 1 auto; display: flex; flex-direction: column; border-top: 3px solid var(--blue); background: var(--surface); overflow: hidden; }
.utility-feed .story-card { display: block; padding: .62rem .8rem; border-bottom: 1px solid var(--line); }
.utility-feed .story-card .story-image { display: none; }
.utility-feed .story-card h3 { font-family: var(--font-body); font-size: .88rem; font-weight: 800; line-height: 1.3; }
.utility-feed .story-card p { display: none; }
.utility-feed .story-meta { margin-bottom: .22rem; font-size: .6rem; }
.utility-feed .empty-state { border: 0; }

.path-band, .learning-band, .mosaic-band, .archive-band, .practical-band { margin-top: 2.8rem; }
.path-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .8rem; }
.path-card { min-height: 10rem; display: flex; flex-direction: column; justify-content: space-between; padding: 1rem; border: 1px solid var(--line); border-top: 3px solid var(--blue); background: var(--surface); box-shadow: var(--shadow-small); }
.path-card:nth-child(2) { border-top-color: var(--warm); }
.path-card:nth-child(3) { border-top-color: #6a84bd; }
.path-card:nth-child(4) { border-top-color: var(--danger); }
.path-index { color: var(--muted); font-family: var(--font-mono); font-size: .68rem; font-weight: 700; }
.path-card h3 { margin-top: .65rem; font-size: 1.04rem; }
.path-card p { margin-top: .4rem; color: var(--muted); font-size: .83rem; line-height: 1.4; }
.path-card a { margin-top: .75rem; font-size: .76rem; font-weight: 800; }

.learning-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 1.15rem; align-items: stretch; }
.feature-pair { display: grid; grid-template-columns: minmax(0, 1fr); gap: .85rem; }
.feature-pair .story-card { display: grid; grid-template-columns: minmax(8rem, .75fr) minmax(0, 1fr); gap: 1rem; align-items: center; padding: .85rem; border: 1px solid var(--line); background: var(--surface); box-shadow: var(--shadow-small); }
.feature-pair .story-image { display: block; position: relative; grid-column: 1; grid-row: 1 / span 4; aspect-ratio: 4 / 3; overflow: hidden; background: var(--surface-soft); }
.feature-pair .story-image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.feature-pair .story-card .story-body { grid-column: 2; }
.feature-pair .story-card h3 { font-size: 1.17rem; }
.feature-pair .story-card p { font-size: .82rem; }
.task-stack { display: flex; flex-direction: column; height: 100%; padding: 0 .85rem; border-left: 3px solid var(--accent-soft); background: var(--surface); }
.task-stack .story-card { display: grid; grid-template-columns: 2.3rem minmax(0, 1fr); gap: .7rem; align-items: start; padding: .65rem 0; border-bottom: 1px solid var(--line); }
.task-stack .story-card::before { content: '→'; display: grid; place-items: center; width: 1.9rem; height: 1.9rem; color: var(--blue); border: 1px solid var(--line-strong); font-family: var(--font-mono); font-size: .8rem; }
.task-stack .story-image { display: none; }
.task-stack .story-meta { grid-column: 2; grid-row: 1; margin: 0; font-size: .59rem; }
.task-stack .story-card h3 { grid-column: 2; grid-row: 2; font-family: var(--font-body); font-size: .92rem; }
.task-stack .story-card p { grid-column: 2; grid-row: 3; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 1; overflow: hidden; margin-top: .15rem; font-size: .75rem; }

.mosaic-grid { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); grid-auto-rows: minmax(9.5rem, auto); gap: .85rem; }
.mosaic-grid .story-card { min-width: 0; display: flex; flex-direction: column; padding: 1rem; border: 1px solid var(--line); background: var(--surface); }
.mosaic-grid .story-card:nth-child(1), .mosaic-grid .story-card:nth-child(2) { grid-column: span 3; }
.mosaic-grid .story-card:nth-child(n+3) { grid-column: span 2; }
.mosaic-grid .story-image { display: block; position: relative; aspect-ratio: 5 / 2; overflow: hidden; order: -1; margin: -1rem -1rem .8rem; background: var(--surface-soft); }
.mosaic-grid .story-image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.mosaic-grid .story-card h3 { margin-top: auto; font-size: 1.05rem; }
.mosaic-grid .story-card p { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }

.archive-grid { display: grid; grid-template-columns: repeat(2, minmax(min(100%, 16rem), 1fr)); gap: .85rem; align-items: stretch; }
.archive-grid .story-card { min-width: 0; display: flex; flex-direction: column; height: 100%; padding: .8rem; border: 1px solid var(--line); background: var(--surface); }
.archive-grid .story-image { display: block; position: relative; aspect-ratio: 5 / 2; overflow: hidden; order: -1; margin: -.8rem -.8rem .7rem; background: var(--surface-soft); }
.archive-grid .story-image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.archive-grid .story-card h3 { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 3; overflow: hidden; font-size: 1.02rem; }
.archive-grid .story-card p { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; margin-top: auto; padding-top: .45rem; font-size: .8rem; }
.answer-rail { display: flex; flex-direction: column; border-top: 3px solid var(--warm); background: var(--surface); }
.answer-rail .story-card { padding: .77rem .9rem; border-bottom: 1px solid var(--line); }
.answer-rail .story-image { display: none; }
.answer-rail .story-card h3 { font-family: var(--font-body); font-size: .9rem; }
.answer-rail .story-card p { display: none; }

.practical-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.practical-column { min-width: 0; padding: .85rem; border: 1px solid var(--line); background: color-mix(in srgb, var(--surface) 82%, var(--accent-soft)); }
.practical-column:nth-child(2) { background: color-mix(in srgb, var(--surface) 88%, var(--warm)); }
.practical-column:nth-child(3) { background: color-mix(in srgb, var(--surface) 88%, var(--blue)); }
.practical-column h3 { padding-bottom: .6rem; border-bottom: 2px solid var(--navy); font-size: 1rem; }
.practical-column [data-feed] { margin-top: .35rem; }
.practical-column .story-card { display: grid; grid-template-columns: 2rem minmax(0, 1fr); gap: .55rem; padding: .6rem 0; border-bottom: 1px solid var(--line); }
.practical-column .story-card::before { content: '•'; color: var(--blue); font-size: 1.3rem; line-height: 1; }
.practical-column .story-image { display: none; }
.practical-column .story-meta { grid-column: 2; margin: 0; font-size: .58rem; }
.practical-column .story-card h3 { grid-column: 2; font-family: var(--font-body); font-size: .87rem; }
.practical-column .story-card p { display: none; }

.page-intro { display: grid; grid-template-columns: minmax(0, 1fr) minmax(15rem, .5fr); gap: 2rem; align-items: end; margin-bottom: 2rem; padding-bottom: 1.3rem; border-bottom: 1px solid var(--line-strong); }
.page-intro p { max-width: 42rem; margin-top: .7rem; color: var(--muted); font-size: 1.02rem; }
.page-aside-note { padding: .8rem 1rem; border-left: 3px solid var(--warm); color: var(--muted); font-size: .8rem; }
.archive-controls { display: flex; flex-wrap: wrap; gap: .8rem; align-items: center; margin-bottom: 1.4rem; padding: .75rem; background: var(--surface); border: 1px solid var(--line); }
.archive-form { display: flex; flex: 1 1 20rem; min-width: 0; }
.archive-form input { min-width: 0; width: 100%; padding: .68rem .8rem; color: var(--ink); border: 1px solid var(--line-strong); background: var(--surface); }
.archive-form button { padding: .68rem 1rem; color: #fff; border: 0; background: var(--blue); font-weight: 800; }
.filter-list { display: flex; flex-wrap: wrap; gap: .4rem; }
.filter-list a { padding: .35rem .6rem; color: var(--muted); border: 1px solid var(--line); font-size: .75rem; text-decoration: none; }
.filter-list a:hover, .filter-list a[aria-current="true"] { color: #fff; border-color: var(--blue); background: var(--blue); }

.guide-layout, .tool-layout { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(14rem, .65fr); gap: 1.3rem; align-items: start; }
.content-panel { padding: clamp(1.2rem, 3vw, 2.2rem); border: 1px solid var(--line); background: var(--surface); box-shadow: var(--shadow-small); }
.content-panel + .content-panel { margin-top: 1rem; }
.content-panel h2 { margin-bottom: .8rem; font-size: 1.5rem; }
.content-panel h3 { margin: 1.25rem 0 .4rem; font-size: 1.08rem; }
.content-panel p + p { margin-top: .85rem; }
.content-panel p, .content-panel li { color: var(--muted); }
.content-panel ul, .content-panel ol { margin: .7rem 0 0; padding-left: 1.3rem; }
.content-panel li + li { margin-top: .45rem; }
.guide-steps { counter-reset: guide; display: grid; gap: .75rem; }
.guide-step { counter-increment: guide; display: grid; grid-template-columns: 2.5rem minmax(0, 1fr); gap: .85rem; padding: .85rem; border: 1px solid var(--line); background: var(--surface-soft); }
.guide-step::before { content: counter(guide, decimal-leading-zero); color: var(--blue); font-family: var(--font-mono); font-weight: 700; }
.guide-step h3 { margin: 0; }
.guide-step p { margin-top: .3rem; font-size: .9rem; }
.reference-rail { position: sticky; top: 1rem; }
.reference-rail .content-panel { background: var(--navy-deep); border: 0; }
.reference-rail .content-panel h2, .reference-rail .content-panel h3 { color: #edf8ff; }
.reference-rail .content-panel p, .reference-rail .content-panel li { color: #b9d0df; }
.reference-rail a { color: #a9ddfa; }
.code-note { margin-top: 1rem; padding: 1rem; color: #dff3ff; background: #0b2334; font-family: var(--font-mono); font-size: .76rem; overflow-x: auto; }

.tool-grid { display: grid; gap: 1rem; }
.tool-card { padding: 1rem; border: 1px solid var(--line); background: var(--surface); }
.tool-card h2 { font-size: 1.35rem; }
.tool-card p { margin-top: .5rem; color: var(--muted); font-size: .9rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; margin-top: 1rem; }
.form-field label { display: block; margin-bottom: .3rem; color: var(--muted); font-size: .75rem; font-weight: 800; }
.form-field input, .form-field select { width: 100%; padding: .65rem; color: var(--ink); border: 1px solid var(--line-strong); background: var(--surface); }
.tool-action { width: 100%; margin-top: 1rem; padding: .75rem 1rem; color: #fff; border: 0; background: var(--blue); font-weight: 800; }
.tool-result { min-height: 4rem; display: flex; align-items: center; margin-top: 1rem; padding: .8rem 1rem; color: var(--navy); border-left: 3px solid var(--warm); background: var(--accent-soft); font-weight: 800; }
.callout { padding: 1rem; border-left: 3px solid var(--blue); background: var(--surface-soft); }
.callout strong { color: var(--navy); }

.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 11.5rem; gap: 1.4rem; align-items: start; }
.article-layout:has([data-side-links][hidden]), .article-layout:has([data-side-links]:empty) { grid-template-columns: minmax(0, 1fr); }
#article-content { min-width: 0; }
.article-header { max-width: 60rem; margin: 0 auto 1.3rem; }
.article-header h1 { max-width: 18ch; }
.article-deck { max-width: 47rem; margin-top: .75rem; color: var(--muted); font-size: 1.08rem; }
.article-cover { position: relative; aspect-ratio: 16 / 7; overflow: hidden; margin: 1rem 0 1.7rem; background: var(--surface-soft); }
.article-cover img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.prose { max-width: 60rem; margin: 0 auto; }
.prose p, .prose li { color: var(--ink); font-size: 1.05rem; line-height: 1.78; }
.prose p + p { margin-top: 1.15rem; }
.prose h2 { margin: 2.2rem 0 .7rem; font-size: 1.75rem; }
.prose h3 { margin: 1.6rem 0 .55rem; font-size: 1.25rem; }
.prose ul, .prose ol { margin: .8rem 0 1rem; padding-left: 1.4rem; }
.prose li + li { margin-top: .5rem; }
.prose a { color: var(--blue); font-weight: 700; }
.prose code { padding: .15rem .3rem; color: var(--navy); background: var(--accent-soft); font-family: var(--font-mono); font-size: .88em; }
.byline { display: flex; align-items: center; gap: .75rem; max-width: 60rem; margin: 0 auto 1.2rem; padding: .75rem 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.byline img { width: 2.7rem; height: 2.7rem; border-radius: 50%; object-fit: cover; background: var(--surface-soft); }
.byline strong { color: var(--navy); }
.byline p { color: var(--muted); font-size: .8rem; }
.category-results { margin-top: 1.4rem; }
.category-results.news-grid { grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr)); align-items: stretch; }

.site-footer { padding: 1.6rem 0 2.2rem; color: #c7d9e5; background: var(--navy-deep); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; width: var(--shell); margin: 0 auto; }
.footer-brand { color: #fff; font-family: var(--font-display); font-size: 1.1rem; }
.footer-inner p { color: #9fb7c7; font-size: .78rem; }
.footer-nav { display: flex; flex-wrap: wrap; gap: .9rem; }
.footer-nav a { color: #c7e5f5; font-size: .78rem; text-decoration: none; }

.not-found { min-height: 55vh; display: grid; place-items: center; text-align: center; }
.not-found-inner { max-width: 36rem; padding: 2.5rem 1rem; }
.not-found-code { color: var(--warm); font-family: var(--font-mono); font-size: 1rem; font-weight: 800; letter-spacing: .16em; }
.not-found h1 { margin-top: .5rem; }
.not-found p { margin: 1rem auto 1.4rem; color: var(--muted); }
.button-link { display: inline-block; padding: .72rem 1rem; color: #fff; background: var(--blue); font-weight: 800; text-decoration: none; }

@media (max-width: 1050px) {
  :root { --shell: min(92vw, 1420px); }
  .desk-fold { grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr); }
  .desk-column.utility-column { grid-column: 1 / -1; }
  .utility-feed { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .utility-feed .story-card { border-right: 1px solid var(--line); }
}
@media (max-width: 800px) {
  :root { --shell: min(94vw, 680px); }
  .header-row { flex-wrap: wrap; gap: .7rem; }
  .brand-lockup { flex: 1 1 auto; }
  .header-actions { order: 3; width: 100%; margin-left: 0; }
  .header-search { flex: 1 1 auto; width: auto; }
  .chrome-cluster { margin-left: 0; }
  .menu-toggle { display: grid; }
  .primary-nav { display: none; }
  .primary-nav.is-open { display: block; }
  .nav-inner { display: grid; grid-template-columns: repeat(2, 1fr); padding: .55rem 1rem; }
  .nav-inner a { border-bottom: 1px solid var(--line); }
  .home-intro, .page-intro { display: block; }
  .issue-note, .page-aside-note { margin-top: 1rem; }
  .desk-fold, .learning-grid, .guide-layout, .tool-layout, .article-layout { grid-template-columns: 1fr; }
  .desk-column.utility-column { grid-column: auto; }
  .utility-feed { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .utility-feed .story-card:nth-child(2n) { border-right: 0; }
  .path-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mosaic-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .mosaic-grid .story-card:nth-child(1), .mosaic-grid .story-card:nth-child(2), .mosaic-grid .story-card:nth-child(n+3) { grid-column: span 1; }
  .mosaic-grid .story-card:nth-child(1) { grid-column: span 2; }
  .practical-grid { grid-template-columns: 1fr; }
  .reference-rail, .side-links { position: static; }
  .article-layout:has([data-side-links][hidden]), .article-layout:has([data-side-links]:empty) { grid-template-columns: 1fr; }
  .footer-inner { display: block; }
  .footer-nav { margin-top: .8rem; }
}
@media (max-width: 480px) {
  h1 { font-size: 2.05rem; }
  .path-grid, .archive-grid { grid-template-columns: 1fr; }
  .feature-pair .story-card { grid-template-columns: 1fr; }
  .feature-pair .story-image, .feature-pair .story-card .story-body { grid-column: 1; grid-row: auto; }
  .feature-pair .story-image { aspect-ratio: 16 / 8; }
  .utility-feed { grid-template-columns: 1fr; }
  .utility-feed .story-card { border-right: 0; }
  .mosaic-grid { grid-template-columns: 1fr; }
  .mosaic-grid .story-card:nth-child(1) { grid-column: span 1; }
  .form-row { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
::view-transition-old(root), ::view-transition-new(root) { animation-duration: .18s; }