/* ArtaPattern website — token variables (mirrors ds/artapattern/tokens.json) + page layout.
   Component classes (ap-*) come from ds/artapattern/components/bundle.css. */
:root, [data-theme="light"] {
  --surface: #FFFFFF; --surface-paper: #F7F5F1; --surface-sunken: #EFEBE4; --surface-inverse: #0B1A26;
  --navy: #0B1A26; --navy-700: #1F2C39; --on-navy: #F7F5F1; --on-navy-muted: #A7B0BB;
  --gold: #A3784F; --gold-light: #E8C9A0; --gold-deep: #96693F;
  --text: #0B1A26; --text-muted: #5D6470; --text-accent: #86603A; --text-inverse: #F7F5F1; --text-inverse-muted: #A7B0BB;
  --line: #E2DDD4; --line-strong: #7E858F;
  --action: #0B1A26; --action-hover: #1F2C39; --on-action: #F7F5F1; --focus: #0B1A26;
  --danger: #9F3A2C; --success: #2E6A4C;
  --shadow-raised: 0 1px 2px rgba(11,26,38,0.06), 0 8px 24px rgba(11,26,38,0.06); --shadow-none: none;
}
[data-theme="dark"] {
  --surface: #0B1A26; --surface-paper: #102331; --surface-sunken: #07121B; --surface-inverse: #F2EEE7;
  --gold: #D2A574; --text: #F2EEE7; --text-muted: #A7B0BB; --text-accent: #DDB88C; --text-inverse: #0B1A26; --text-inverse-muted: #5D6470;
  --line: #22333F; --line-strong: #617382; --action: #E8C9A0; --action-hover: #D2A574; --on-action: #0B1A26; --focus: #F2EEE7;
  --danger: #E58B76; --success: #7CC3A0;
  --shadow-raised: 0 1px 2px rgba(0,0,0,0.4), 0 8px 24px rgba(0,0,0,0.3);
}
:root {
  --space-1: 4px; --space-2: 8px; --space-3: 12px; --space-4: 16px; --space-6: 24px; --space-8: 32px; --space-12: 48px; --space-16: 64px; --space-24: 96px; --space-32: 128px;
  --radius-none: 0px; --radius-sm: 2px; --radius-md: 4px; --radius-lg: 8px;
  --container-max: 1200px; --container-text: 720px; --gutter: 24px; --margin-desktop: 48px; --margin-mobile: 20px; --header-height: 64px;
  --font-sans: "Inter", "Helvetica Neue", Arial, system-ui, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

/* ---------- page layout ---------- */
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--surface); }
.skip { position: absolute; left: -9999px; top: 8px; z-index: 50; background: var(--action); color: var(--on-action); padding: 10px 16px; border-radius: var(--radius-md); }
.skip:focus { left: 16px; }
.wrap { width: 100%; max-width: calc(var(--container-max) + 2 * var(--margin-desktop)); margin: 0 auto; padding: 0 var(--margin-desktop); box-sizing: border-box; }
.section { padding: var(--space-24) 0; }
.section--paper { background: var(--surface-paper); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section--tight { padding: var(--space-16) 0; }
.stack-12 { display: grid; gap: var(--space-12); }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--gutter); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--gutter); }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-12); }
.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: var(--space-16); align-items: start; }
.split--rev { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.sticky-col { position: sticky; top: calc(var(--header-height) + 32px); }
.muted { color: var(--text-muted); }
.lead { font-size: 19px; line-height: 31px; color: var(--text-muted); margin: 0; max-width: 60ch; }
.h1 { margin: 0; font-size: 56px; line-height: 60px; font-weight: 600; letter-spacing: -.025em; }
.h1 .soft { color: var(--text-muted); }
.h2 { margin: 0; font-size: 32px; line-height: 40px; font-weight: 600; letter-spacing: -.015em; }
.h3 { margin: 0; font-size: 22px; line-height: 29px; font-weight: 600; letter-spacing: -.01em; }
.mono { font-family: var(--font-mono); font-size: 12px; line-height: 16px; letter-spacing: .04em; }
.list-check { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.list-check li { position: relative; padding-left: 22px; }
.list-check li::before { content: ""; position: absolute; left: 0; top: 9px; width: 8px; height: 8px; border: 1px solid var(--gold); background: linear-gradient(var(--gold), var(--gold)) center / 4px 4px no-repeat; }
.page-head { padding: var(--space-24) 0 var(--space-16); border-bottom: 1px solid var(--line); }
.page-head .h1 { max-width: 18ch; margin-top: var(--space-4); }
.page-head .lead { margin-top: var(--space-6); }

/* hero */
.hero { padding: var(--space-24) 0 var(--space-24); }
.hero__grid { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 5fr); gap: var(--space-16); align-items: center; }
.hero__copy { display: grid; gap: var(--space-6); }
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-2); }

/* hero diagram panel: domain → architecture → engineering → production */
.evo__label { font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--on-navy-muted); display: flex; justify-content: space-between; margin-bottom: 28px; }
.evo__layer { position: relative; display: grid; grid-template-columns: 112px minmax(0,1fr); gap: 20px; align-items: center; padding: 14px 0; }
.evo__layer + .evo__layer { border-top: 1px dashed rgba(232,201,160,.28); }
.evo__name { font-family: var(--font-mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--gold-light); display: flex; align-items: center; gap: 8px; }
.evo__name::before { content: ""; width: 7px; height: 7px; background: var(--gold); flex: none; }
.evo__row { display: flex; gap: 10px; flex-wrap: wrap; }
.evo__box { flex: 1 1 0; min-width: 0; border: 1px solid rgba(247,245,241,.28); border-radius: var(--radius-sm); padding: 8px 10px; font-size: 12px; line-height: 16px; color: var(--on-navy); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.evo__box small { display: block; font-family: var(--font-mono); font-size: 10px; color: var(--on-navy-muted); }
.evo__box--focus { border-color: var(--gold-light); background: rgba(232,201,160,.08); }
.evo__boundary { border: 1px dashed var(--gold); border-radius: var(--radius-md); padding: 10px; display: flex; gap: 8px; flex: 1; position: relative; }
.evo__rail { position: absolute; left: 3px; top: 92px; bottom: 54px; width: 1px; background: var(--gold); opacity: .6; }
.evo__foot { margin-top: 22px; display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 10px; color: var(--on-navy-muted); }

/* AI workflow band */
.band-navy { background: var(--navy); color: var(--on-navy); }
.band-navy .ap-eyebrow { color: var(--gold-light); }
.band-navy .h2 { color: var(--on-navy); }
.band-navy .lead, .band-navy .muted { color: var(--on-navy-muted); }
.band-navy .ap-flow h4 { color: var(--on-navy); }
.band-navy .ap-flow p { color: var(--on-navy-muted); }
.band-navy .ap-flow__n { color: var(--gold-light); }
.band-navy .ap-flow > li::before { background: var(--navy); border-color: var(--gold-light); box-shadow: inset 0 0 0 3px var(--navy), inset 0 0 0 8px var(--gold-light); }
.band-navy .ap-flow::before { background: var(--gold-light); }
.principles { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 0; border-top: 1px solid rgba(247,245,241,.18); margin-top: var(--space-12); }
.principles > div { padding: var(--space-6) var(--space-6) 0 0; }
.principles h4 { margin: 0 0 6px; font-size: 15px; font-weight: 600; color: var(--on-navy); }
.principles p { margin: 0; font-size: 14px; line-height: 21px; color: var(--on-navy-muted); }

/* services page */
.svc { display: grid; grid-template-columns: 96px minmax(0, 5fr) minmax(0, 6fr); gap: var(--space-8); padding: var(--space-12) 0; border-top: 1px solid var(--line); }
.svc__num { font-family: var(--font-mono); font-size: 13px; color: var(--text-accent); padding-top: 6px; }
.svc__intro { display: grid; gap: var(--space-4); align-content: start; }
.svc__body { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: var(--space-8); }
.svc__body h4 { margin: 0 0 var(--space-3); font-family: var(--font-mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); font-weight: 500; }
.svc__body ul { font-size: 15px; line-height: 22px; }
.svc__more { grid-column: 1 / -1; }
.deliv { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.deliv li { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border: 1px solid var(--line); border-radius: var(--radius-md); font-size: 14px; background: var(--surface); }
.deliv li::before { content: "DOC"; font-family: var(--font-mono); font-size: 9px; letter-spacing: .06em; color: var(--text-accent); border: 1px solid var(--gold); padding: 1px 4px; border-radius: var(--radius-sm); }
.toggle { display: inline-flex; align-items: center; gap: 8px; background: none; border: 0; padding: 8px 0; min-height: 44px; font: 500 15px/20px var(--font-sans); color: var(--text); cursor: pointer; text-decoration: underline; text-decoration-color: var(--gold); text-underline-offset: 5px; }
.engage { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); }
.engage > article { padding: var(--space-8); display: grid; gap: var(--space-3); align-content: start; }
.engage > article + article { border-left: 1px solid var(--line); }
.engage .scale { display: flex; gap: 4px; margin-bottom: var(--space-2); }
.engage .scale i { width: 18px; height: 6px; background: var(--line); display: block; }
.engage .scale i.on { background: var(--gold); }

/* case study */
.cs-hero { padding: var(--space-16) 0 var(--space-12); }
.cs-body { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: var(--space-16); }
.cs-section { padding: var(--space-12) 0; border-top: 1px solid var(--line); display: grid; gap: var(--space-4); }
.cs-section:first-child { border-top: 0; padding-top: 0; }
.cs-section > .mono { color: var(--text-accent); }
.cs-section p { margin: 0; max-width: 68ch; color: var(--text); font-size: 17px; line-height: 29px; }
.ph { color: var(--text-muted); font-style: italic; }
.placeholder { border: 1px dashed var(--line-strong); border-radius: var(--radius-md); padding: var(--space-4); font-size: 14px; color: var(--text-muted); background: var(--surface-paper); }
.diag-c4 { display: grid; grid-template-columns: 1fr 64px 2.4fr 64px 1fr; align-items: center; }
.wire-h { height: 1px; background: var(--gold); position: relative; }
.wire-h::after { content: ""; position: absolute; right: -1px; top: -3px; width: 7px; height: 7px; background: var(--gold); }
.wire-h--dash { background: repeating-linear-gradient(90deg, var(--gold) 0 4px, transparent 4px 8px); }
.diag-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }

/* work index */
.work-row { padding: 0; gap: 0; display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); }
.work-row__side { padding: 32px; border-right: 1px solid var(--line); display: grid; gap: 16px; align-content: start; background: var(--surface-paper); }
.work-row__main { padding: 32px; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 32px; }
@media (max-width: 899px) {
  .work-row { grid-template-columns: 1fr; }
  .work-row__side { border-right: 0; border-bottom: 1px solid var(--line); padding: 24px; }
  .work-row__main { grid-template-columns: 1fr; padding: 24px; }
  .work-row__main > div { grid-column: auto !important; }
}

/* insights */
.feature { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); border: 1px solid var(--line); border-radius: var(--radius-md); overflow: hidden; background: var(--surface); }
.feature__body { padding: var(--space-12); display: grid; gap: var(--space-4); align-content: start; }
.feature__art { background: var(--navy); display: flex; align-items: center; justify-content: center; padding: var(--space-8); min-height: 300px; }

/* about */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline::before { content: ""; position: absolute; left: 7px; top: 8px; bottom: 8px; width: 1px; background: var(--gold); }
.timeline > li { position: relative; padding: 0 0 var(--space-8) 44px; display: grid; gap: 6px; }
.timeline > li::before { content: ""; position: absolute; left: 0; top: 4px; width: 15px; height: 15px; background: var(--surface); border: 1px solid var(--gold); box-shadow: inset 0 0 0 3px var(--surface), inset 0 0 0 8px var(--gold); box-sizing: border-box; }
.timeline .mono { color: var(--text-accent); }
.timeline h3 { margin: 0; font-size: 19px; line-height: 26px; font-weight: 600; }
.timeline p { margin: 0; color: var(--text-muted); max-width: 62ch; }
.quote { font-size: 28px; line-height: 38px; font-weight: 500; letter-spacing: -.015em; margin: 0; padding: var(--space-8) 0; border-top: 1px solid var(--gold); border-bottom: 1px solid var(--gold); }
.portrait { aspect-ratio: 4 / 5; border-radius: var(--radius-lg); background: var(--surface-sunken); border: 1px dashed var(--line-strong); display: flex; align-items: center; justify-content: center; text-align: center; padding: var(--space-6); font-size: 14px; color: var(--text-muted); }

/* contact */
.contact { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: var(--space-16); padding-top: var(--space-16); padding-bottom: var(--space-24); }
.contact__opts { display: grid; gap: var(--space-4); align-content: start; }
.contact__opt { display: grid; gap: 4px; padding: var(--space-6); border: 1px solid var(--line); border-radius: var(--radius-md); text-decoration: none; color: var(--text); background: var(--surface); }
.contact__opt:hover { border-color: var(--line-strong); }
.contact__opt .v { font-size: 17px; font-weight: 600; word-break: break-all; }
.form-card { padding: var(--space-12); border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); display: grid; gap: var(--space-6); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-6); }
.integration { font-family: var(--font-mono); font-size: 12px; line-height: 18px; color: var(--text-muted); border-top: 1px dashed var(--line-strong); padding-top: var(--space-4); }

/* ---------- responsive ---------- */
@media (max-width: 1100px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .hero__grid, .split, .split--rev, .contact, .feature { grid-template-columns: 1fr; }
  .svc { grid-template-columns: 64px minmax(0, 1fr); }
  .svc__body { grid-column: 2; }
  .cs-body { grid-template-columns: minmax(0, 1fr); }
  .cs-body .ap-toc { display: none; }
  .sticky-col { position: static; }
}
@media (max-width: 767px) {
  .wrap { padding: 0 var(--margin-mobile); }
  .section { padding: var(--space-16) 0; }
  .hero { padding: var(--space-12) 0 var(--space-16); }
  .h1 { font-size: 36px; line-height: 42px; letter-spacing: -.02em; }
  .h2 { font-size: 28px; line-height: 34px; }
  .lead { font-size: 17px; line-height: 28px; }
  .grid-4, .grid-3, .grid-2, .engage, .principles, .form-row, .svc__body { grid-template-columns: 1fr; }
  .svc { grid-template-columns: 1fr; gap: var(--space-4); padding: var(--space-8) 0; }
  .svc__body { grid-column: auto; gap: var(--space-6); }
  .engage > article + article { border-left: 0; border-top: 1px solid var(--line); }
  .evo__layer { grid-template-columns: 1fr; gap: 10px; }
  .evo__rail { display: none; }
  .evo__box { font-size: 11px; padding: 6px 8px; }
  .page-head { padding: var(--space-12) 0 var(--space-12); }
  .feature__body, .form-card { padding: var(--space-6); }
  .feature__art { min-height: 200px; }
  .diag-c4 { grid-template-columns: 1fr; gap: 0; }
  .diag-c4 .wire-h { width: 1px; height: 28px; margin: 0 auto; }
  .diag-c4 .wire-h::after { right: -3px; top: auto; bottom: -1px; }
  .diag-c4 .wire-h--dash { background: repeating-linear-gradient(180deg, var(--gold) 0 4px, transparent 4px 8px); }
  .quote { font-size: 22px; line-height: 31px; }
  .contact { padding-top: var(--space-8); padding-bottom: var(--space-16); gap: var(--space-8); }
  .hero__actions .ap-btn { flex: 1 1 100%; }
}

/* ---------- production additions ---------- */
[hidden] { display: none !important; }
.ap-header { position: sticky; top: 0; }
.ap-mobile-nav { position: fixed; top: var(--header-height); left: 0; right: 0; z-index: 19; max-height: calc(100vh - var(--header-height)); overflow: auto; box-shadow: var(--shadow-raised); }
.ap-mobile-nav a[aria-current="page"] { color: var(--text-accent); }
.ap-field .ap-error { display: none; }
.ap-field.is-invalid .ap-error { display: block; }
.ap-note a { color: var(--text); font-weight: 600; }
.about-mark { display: grid; place-items: center; gap: 20px; padding: 48px 24px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface-paper); text-align: center; }
.about-mark img { width: 168px; height: auto; }
.ap-footer .ap-brand img.ap-brand__mark { height: 34px; width: auto; }
.ap-brand img.ap-brand__word { height: 15px; width: auto; }
:target { scroll-margin-top: calc(var(--header-height) + 24px); }
.svc, .cs-section { scroll-margin-top: calc(var(--header-height) + 24px); }
/* Grid children must be allowed to shrink so long code lines and diagrams never widen the page */
.cs-body > * { min-width: 0; }
.cs-body .ap-toc { align-self: start; align-content: start; }
.ap-diagram { max-width: 100%; overflow-x: auto; }
@media (max-width: 599px) { nav[aria-label="More case studies"] { grid-template-columns: 1fr !important; } nav[aria-label="More case studies"] a:last-child { text-align: left !important; } }

/* Work page: stat band and project archive */
.stat-band dd { font-size: 36px; line-height: 44px; font-weight: 600; letter-spacing: -.01em; color: var(--text); }
.stat-band dt { margin-bottom: 8px; }
.archive { list-style: none; margin: 0; padding: 0; }
.archive__item { display: grid; grid-template-columns: 148px minmax(0, 1fr); gap: var(--space-6); padding: var(--space-6) 0; border-top: 1px solid var(--line); }
.archive__item:last-child { border-bottom: 1px solid var(--line); }
.archive__meta { display: grid; gap: 4px; align-content: start; color: var(--text-accent); text-transform: uppercase; }
.archive__meta span + span { color: var(--text-muted); }
.archive__item h3 { margin: 0 0 var(--space-2); font-size: 18px; line-height: 26px; }
.archive__item p { margin: 0 0 var(--space-3); color: var(--text-muted); }
@media (max-width: 599px) {
  .archive__item { grid-template-columns: 1fr; gap: var(--space-2); }
  .archive__meta { grid-auto-flow: column; justify-content: start; gap: 12px; }
  .stat-band dd { font-size: 28px; line-height: 36px; }
}


/* Home: hero byline, engagement path, starting offers, attribution, steps, founder */
.hero__by { margin: calc(-1 * var(--space-3)) 0 0; font-size: 16px; color: var(--text-muted); }
.hero__by a { color: var(--text); font-weight: 600; }
.hero__meta { margin: 0; padding-top: var(--space-5, 20px); border-top: 1px solid var(--line); font-size: 15px; line-height: 23px; color: var(--text-muted); max-width: 52ch; }
.path { background: var(--navy); color: var(--on-navy); border-radius: var(--radius-lg); padding: 36px 32px; }
.path__label { font: 500 12px/16px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--gold-light); margin-bottom: 24px; }
.path__steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.path__steps li { display: grid; grid-template-columns: 40px minmax(0, 1fr); gap: 16px; padding: 20px 0; border-top: 1px solid rgba(247,245,241,.16); position: relative; }
.path__steps li:first-child { border-top: 0; padding-top: 0; }
.path__n { font: 500 13px/24px var(--font-mono); color: var(--gold-light); }
.path__steps h2 { margin: 0 0 4px; font-size: 22px; line-height: 28px; font-weight: 600; color: var(--on-navy); }
.path__steps p { margin: 0 0 8px; font-size: 16px; line-height: 24px; color: var(--on-navy-muted); }
.path__out { display: inline-block; font: 500 13px/18px var(--font-mono); color: var(--gold-light); }
.offers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--gutter); }
.offer { display: grid; grid-template-rows: auto auto auto 1fr auto auto; gap: var(--space-4); padding: var(--space-8); background: var(--surface); border: 1px solid var(--line); border-top: 3px solid var(--gold); border-radius: var(--radius-md); scroll-margin-top: calc(var(--header-height) + 24px); }
.offer__problem { font-size: 15px; font-weight: 500; color: var(--text-accent); }
.offer__title { margin: 0; font-size: 22px; line-height: 28px; font-weight: 600; }
.offer__title .mono { color: var(--text-muted); margin-right: 6px; }
.offer__text { margin: 0; color: var(--text-muted); }
.offer__label { display: block; margin: 0 0 var(--space-2); font: 500 11px/16px var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); }
.offer .list-check { font-size: 15px; line-height: 22px; }
.offer__ex { margin: 0; padding-top: var(--space-4); border-top: 1px solid var(--line); font-size: 14px; line-height: 21px; color: var(--text-muted); }
.offer__cta { justify-self: start; }
.attribution { margin: 0; padding: var(--space-4) var(--space-6); border-left: 2px solid var(--gold); background: var(--surface-paper); font-size: 14px; line-height: 22px; color: var(--text-muted); max-width: 80ch; }
.section--paper .attribution { background: var(--surface); }
.steps { list-style: none; margin: 0; padding: 0; }
.steps li { display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: var(--space-4); padding: var(--space-6) 0; border-top: 1px solid var(--line); }
.steps li:last-child { border-bottom: 1px solid var(--line); }
.steps .mono { color: var(--text-accent); padding-top: 4px; }
.steps h3 { margin: 0 0 4px; font-size: 18px; line-height: 26px; }
.steps p { margin: 0; color: var(--text-muted); }
.founder { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: var(--space-12); align-items: start; }
.founder__mark { width: 160px; height: auto; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface-paper); box-sizing: content-box; }
.founder__body { display: grid; gap: var(--space-4); max-width: 68ch; }
.founder__body .h2 { margin: 0; }
@media (max-width: 1023px) {
  .offers { grid-template-columns: 1fr; }
  .founder { grid-template-columns: 1fr; gap: var(--space-6); }
  .founder__mark { width: 96px; padding: 16px; }
}
@media (max-width: 599px) {
  .hero { padding: 28px 0 var(--space-16); }
  .hero .ap-eyebrow { letter-spacing: .1em; font-size: 11px; }
  .hero .h1 { font-size: 32px; line-height: 38px; }
  .hero .lead { font-size: 16px; line-height: 25px; }
  .hero__copy { gap: var(--space-4); }
  .hero__by { margin-top: 0; font-size: 15px; }
  .path { padding: 24px 20px; }
  .path__steps h2 { font-size: 19px; line-height: 26px; }
  .path__steps p { font-size: 15px; line-height: 22px; }
  .offer { padding: var(--space-6); }
}

/* Services: buying guide per service */
.svc__fit { margin-top: var(--space-2); padding: var(--space-4) var(--space-6); border-left: 2px solid var(--gold); background: var(--surface-paper); }
.svc__fit h4, .svc__ex span { display: block; margin: 0 0 6px; font: 500 11px/16px var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); }
.svc__fit p { margin: 0; font-size: 15px; line-height: 23px; color: var(--text); }
.svc__ex { grid-column: 1 / -1; margin: 0; padding-top: var(--space-4); border-top: 1px solid var(--line); font-size: 14px; line-height: 21px; color: var(--text-muted); }

/* Case study: at-a-glance summary */
.glance { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); }
.glance > div { padding: var(--space-6); }
.glance > div + div { border-left: 1px solid var(--line); }
.glance__k { margin: 0 0 var(--space-2); font: 500 11px/16px var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-accent); }
.glance p { margin: 0; font-size: 16px; line-height: 25px; color: var(--text); }
@media (max-width: 767px) { .glance { grid-template-columns: 1fr; } .glance > div + div { border-left: 0; border-top: 1px solid var(--line); } }

/* Article: decision record */
.adr { margin: var(--space-6) 0; border: 1px solid var(--line); border-radius: var(--radius-md); background: var(--surface); }
.adr__row { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: var(--space-4); padding: var(--space-4) var(--space-6); }
.adr__row + .adr__row { border-top: 1px solid var(--line); }
.adr__row span { font: 500 11px/24px var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-accent); }
.adr__row p { margin: 0 !important; font-size: 16px; line-height: 25px; }
@media (max-width: 599px) { .adr__row { grid-template-columns: 1fr; gap: 4px; padding: var(--space-4); } }

/* Services: domain experience cards */
.domain { display: grid; gap: var(--space-4); align-content: start; scroll-margin-top: calc(var(--header-height) + 24px); }
.domain .h3 { margin: 0; }
.domain .list-check { font-size: 15px; line-height: 22px; }
.svc { scroll-margin-top: calc(var(--header-height) + 24px); }

/* Home: expertise panel (replaces the process diagram) */
.hero__grid { align-items: start; }
.hero__by { margin: 0; font-size: 15px; line-height: 22px; color: var(--text-muted); }
.xp { background: var(--navy); color: var(--on-navy); border-radius: var(--radius-lg); padding: 28px; display: grid; gap: 12px; }
.xp__head { margin-bottom: 4px; }
.xp__head h2 { margin: 0 0 6px; font-size: 20px; line-height: 27px; font-weight: 600; color: var(--on-navy); }
.xp__head p { margin: 0; font-size: 14px; line-height: 21px; color: var(--on-navy-muted); }
.xp__row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.xp__card { display: grid; grid-template-columns: 32px minmax(0, 1fr); column-gap: 12px; row-gap: 2px; align-content: start; padding: 16px; border: 1px solid rgba(247,245,241,.2); border-radius: var(--radius-md); text-decoration: none; color: var(--on-navy); transition: border-color .15s ease, background-color .15s ease; }
.xp__card:hover, .xp__card:focus-visible { border-color: var(--gold-light); background: rgba(232,201,160,.06); }
.xp__card > :not(.xp__ico) { grid-column: 2; }
.xp__ico { grid-row: 1 / span 3; width: 32px; height: 32px; }
.xp__tag { font: 500 10px/14px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--gold-light); }
.xp__card h3 { margin: 2px 0 4px; font-size: 16px; line-height: 22px; font-weight: 600; color: var(--on-navy); }
.xp__card p { margin: 0; font-size: 14px; line-height: 20px; color: var(--on-navy-muted); }
.xp__card--core { border-color: var(--gold-light); background: rgba(232,201,160,.08); padding: 20px; }
.xp__card--core h3 { font-size: 19px; line-height: 26px; }
.xp__card--core p { font-size: 15px; line-height: 22px; }
.xp__card--domain { border-style: dashed; }
.xp__way { display: flex; align-items: center; gap: 12px; padding: 12px 16px; border-top: 1px solid rgba(247,245,241,.16); margin-top: 4px; color: var(--on-navy-muted); text-decoration: none; font-size: 14px; line-height: 20px; }
.xp__way .xp__ico { width: 28px; height: 28px; flex: none; }
.xp__way b { display: block; font: 500 10px/14px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--gold-light); }
.xp__way:hover { color: var(--on-navy); }
@media (max-width: 1023px) { .xp { padding: 24px; } }
@media (max-width: 599px) {
  .xp { padding: 20px 16px; }
  .xp__row { grid-template-columns: 1fr; }
}
.xp__row .xp__card { grid-template-columns: minmax(0, 1fr); row-gap: 4px; }
.xp__row .xp__card > * { grid-column: 1; }
.xp__row .xp__ico { grid-row: auto; width: 26px; height: 26px; margin-bottom: 6px; }
@media (max-width: 599px) {
  .hero { padding-top: 20px; }
  .hero .h1 { font-size: 28px; line-height: 34px; }
  .hero__by { font-size: 14px; line-height: 20px; }
}

/* Contact: honeypot field (hidden from people, visible to naive bots) and success note */
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.form-card { position: relative; }
.ap-note--ok { border-color: var(--success, #2E7D4F); }

/* Specialty pages: breadcrumbs and FAQ */
.crumbs { font-size: 14px; color: var(--text-muted); }
.crumbs a { color: var(--text-muted); }
.crumbs [aria-current] { color: var(--text); }
.faq details { border-top: 1px solid var(--line); padding: var(--space-4) 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-size: 18px; line-height: 26px; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 500 20px/26px var(--font-mono); color: var(--text-accent); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: var(--space-3) 0 0; color: var(--text-muted); max-width: 68ch; }
.faq summary:focus-visible { outline: 2px solid var(--focus); outline-offset: 4px; }

/* Article diagrams: sequence lanes, modular monolith, lifecycle loop */
.seq__grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); row-gap: 14px; position: relative; }
.seq__grid::before { content: ""; position: absolute; top: 36px; bottom: 0; left: 0; right: 0; pointer-events: none;
  background: linear-gradient(var(--line-strong), var(--line-strong)) 16.666% 0 / 1px 100% no-repeat,
              linear-gradient(var(--line-strong), var(--line-strong)) 50% 0 / 1px 100% no-repeat,
              linear-gradient(var(--line-strong), var(--line-strong)) 83.333% 0 / 1px 100% no-repeat; opacity: .6; }
.seq__actor { justify-self: center; padding: 8px 16px; border: 1px solid var(--text); border-radius: var(--radius-sm); background: var(--surface); font: 600 14px/20px var(--font-sans); position: relative; z-index: 1; }
.seq__grid > .seq__actor:nth-child(3) { box-shadow: inset 0 0 0 1px var(--gold); }
.seq__msg, .seq__self, .seq__gap { position: relative; z-index: 1; }
.seq__msg { margin: 0 25%; }
.seq__msg { padding-bottom: 6px; border-bottom: 1.5px solid var(--gold); text-align: center; font-size: 14px; line-height: 20px; }
.seq__msg::after { content: ""; position: absolute; right: -1px; bottom: -5px; border: 5px solid transparent; border-left: 8px solid var(--gold); border-right: 0; }
.seq__msg--back { border-bottom-style: dashed; border-bottom-color: var(--text-muted); color: var(--text-muted); }
.seq__msg--back::after { right: auto; left: -1px; border-left: 0; border-right: 8px solid var(--text-muted); }
.seq__self { justify-self: center; padding: 6px 10px; border: 1.5px solid var(--gold); border-radius: var(--radius-md); background: var(--surface); font-size: 13px; line-height: 18px; text-align: center; max-width: 92%; }
.seq__gap { text-align: center; font: 500 11px/16px var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); border-top: 1px dashed var(--line-strong); border-bottom: 1px dashed var(--line-strong); padding: 4px 0; background: var(--surface-sunken); }
.mono-mods { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin-top: 12px; }
.life-loop { margin: 16px 0 0 !important; padding: 10px 14px; border: 1px dashed var(--gold); border-radius: var(--radius-md); font-size: 15px !important; line-height: 22px !important; }
.life-loop span { color: var(--text-accent); font-weight: 600; margin-right: 6px; }
@media (max-width: 599px) {
  .seq__msg, .seq__self { font-size: 12px; line-height: 17px; }
  .seq__actor { padding: 6px 10px; font-size: 13px; }
  .mono-mods { grid-template-columns: 1fr; }
}

/* Home: latest engineering note teaser under the hero actions */
.latest { display: grid; gap: 6px; margin-top: var(--space-6); padding: 18px 20px 18px 22px; max-width: 560px; border: 1px solid var(--line); border-left: 3px solid var(--gold); border-radius: var(--radius-md); background: var(--surface-paper); text-decoration: none; color: var(--text); transition: border-color .15s ease, background-color .15s ease, transform .15s ease; }
.latest:hover, .latest:focus-visible { border-color: var(--line-strong); border-left-color: var(--gold-deep); background: var(--surface); transform: translateY(-1px); }
.latest__label { display: flex; align-items: center; gap: 8px; font: 500 11px/16px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--text-accent); }
.latest__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 3px rgba(163,120,79,.18); }
.latest__title { font-size: 20px; line-height: 27px; font-weight: 600; letter-spacing: -.01em; }
.latest__dek { font-size: 15px; line-height: 23px; color: var(--text-muted); }
.latest__cta { margin-top: 4px; font-size: 14px; font-weight: 500; color: var(--text); }
.latest:hover .ap-arrow { transform: translateX(3px); }
.latest .ap-arrow { display: inline-block; transition: transform .15s ease; }
@media (prefers-reduced-motion: reduce) { .latest, .latest .ap-arrow { transition: none; } .latest:hover { transform: none; } }
@media (max-width: 599px) { .latest { padding: 14px 16px; } .latest__title { font-size: 17px; line-height: 24px; } .latest__dek { display: none; } }

/* Home panel: AI row */
.xp__card--ai { border-color: var(--gold-light); background: linear-gradient(135deg, rgba(232,201,160,.18), rgba(232,201,160,.04) 75%); box-shadow: 0 0 0 1px rgba(232,201,160,.12), 0 8px 24px -12px rgba(232,201,160,.35); }
.xp__card--ai:hover, .xp__card--ai:focus-visible { border-color: var(--gold-light); background: linear-gradient(135deg, rgba(232,201,160,.24), rgba(232,201,160,.06) 75%); }
.xp__card--ai h3 { font-size: 18px; line-height: 25px; }
.xp__card--ai .xp__tag { display: inline-flex; align-items: center; gap: 7px; }
.xp__pulse { width: 6px; height: 6px; border-radius: 50%; background: var(--gold-light); box-shadow: 0 0 0 3px rgba(232,201,160,.22); animation: xp-pulse 2.4s ease-in-out infinite; }
@keyframes xp-pulse { 50% { box-shadow: 0 0 0 5px rgba(232,201,160,.06); } }
@media (prefers-reduced-motion: reduce) { .xp__pulse { animation: none; } }

/* Engineering notes: comparison tables, two-up panels, message lanes */
.cmp-wrap { margin: var(--space-8) 0; overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); }
.cmp { width: 100%; min-width: 560px; border-collapse: collapse; font-size: 15px; line-height: 22px; }
.cmp caption { caption-side: bottom; padding: 12px 16px; text-align: left; font-size: 13px; line-height: 18px; color: var(--text-muted); border-top: 1px solid var(--line); }
.cmp th, .cmp td { padding: 12px 16px; text-align: left; vertical-align: top; border-top: 1px solid var(--line); }
.cmp thead th { border-top: 0; background: var(--surface-sunken); font: 500 11px/16px var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); }
.cmp tbody th { font-weight: 600; color: var(--text); }
.cmp .is-pick { background: rgba(232,201,160,.16); }
.cmp thead .is-pick { color: var(--text-accent); }
.duo { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.duo .ap-node { padding: 14px 16px; gap: 6px; }
.duo .ap-node__meta { font: 400 13px/19px var(--font-sans); }
.lane { display: grid; gap: 10px; }
.lane + .lane { margin-top: 20px; padding-top: 20px; border-top: 1px dashed var(--line-strong); }
.lane__label { font: 500 11px/16px var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-accent); }
.lane__flow { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.lane__arrow { color: var(--gold-deep); font: 600 15px/1 var(--font-mono); }
.lane__note { margin: 0 !important; font-size: 14px !important; line-height: 21px !important; color: var(--text-muted); }
.planes { display: grid; gap: 28px; }
.planes .mono-mods { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
.ap-prose .ap-code { font-size: 14px; }
.ap-prose .list-check { margin: 0 0 var(--space-6); }
@media (max-width: 599px) { .duo { grid-template-columns: 1fr; } .cmp { font-size: 14px; } .lane__flow { gap: 6px; } }
/* Phones: comparison tables become stacked cards; labels come from the column headers (main.js) */
@media (max-width: 599px) {
  .cmp { min-width: 0; }
  .cmp thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .cmp, .cmp tbody, .cmp tr, .cmp th, .cmp td { display: block; }
  .cmp caption { display: block; }
  .cmp tr { padding: 12px 16px; border-top: 1px solid var(--line); }
  .cmp tbody tr:first-child { border-top: 0; }
  .cmp th, .cmp td { padding: 4px 0; border: 0; }
  .cmp tbody th { font-size: 16px; padding-bottom: 6px; }
  .cmp td[data-label]::before { content: attr(data-label); display: block; font: 500 10px/16px var(--font-mono); letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); }
  .cmp .is-pick { background: none; }
  .cmp td.is-pick::before { color: var(--text-accent); }
}