/* Local font registrations retain the reviewed faces and their licenses. */
/* ds-allow-hardcode:start Font-face registration names are not component tokens. */
@font-face { font-family: Manrope; src: url('fonts/manrope-regular.woff2') format('woff2'); font-weight: 400; font-display: swap; }
/* ds-allow-hardcode: font-face registration. */
@font-face { font-family: Manrope; src: url('fonts/manrope-semibold.woff2') format('woff2'); font-weight: 600; font-display: swap; }
/* ds-allow-hardcode: font-face registration. */
@font-face { font-family: Instrument; src: url('fonts/instrument-serif.woff2') format('woff2'); font-weight: 400; font-display: swap; }
/* ds-allow-hardcode: font-face registration. */
@font-face { font-family: Instrument; src: url('fonts/instrument-serif-italic.woff2') format('woff2'); font-weight: 400; font-style: italic; font-display: swap; }
/* ds-allow-hardcode:end */

:root {
  color-scheme: light;
  --paper: #f6f7f2;
  --sheet: #fffef9;
  --ink: #243440;
  --muted: #59666b;
  --line: #cbd1ce;
  --navy: #213a49;
  --navy-hover: #324e5d;
  --accent: #ac2f26;
  --wash: #e8ece7;
  --light-ink: #f6f7f2;
  --light-muted: #cdd7d8;
  --light-accent: #f0b09f;
  --logo-ink: #252923;
  --body: Manrope, Arial, sans-serif;
  --display: Instrument, Georgia, serif;
  --page: clamp(1.25rem, 4.5vw, 4.5rem);
  --max: 85rem;
  --section: clamp(3.5rem, 6vw, 6rem);
  --s0: .25rem;
  --s1: .5rem;
  --s2: 1rem;
  --s3: 1.5rem;
  --s4: 2rem;
  --s5: 3rem;
  --s6: 4rem;
  --fine: .75rem;
  --small: .875rem;
  --body-size: 1rem;
  --body-large: 1.125rem;
  --hero-size: clamp(4.1rem, 7.3vw, 6.6rem);
  --heading-size: clamp(3rem, 5vw, 4.75rem);
  --respect-size: clamp(1.4rem, 2vw, 1.65rem);
  --document-size: clamp(1.65rem, 2.4vw, 2rem);
  --note-size: 1.5rem;
  --control-size: 2.75rem;
  --rule: 1px;
  --focus-width: 3px;
  --focus-offset: 4px;
  --radius: 3px;
  --logo-width: 9px;
  --logo-height: 19px;
  --logo-gap: 3px;
  --press: 1px;
  --arrow-travel: 3px;
  --rise: .4rem;
  --fast: 160ms;
  --enter: 260ms;
  --stagger: 45ms;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-padding-top: var(--s4); }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 var(--body-size)/1.65 var(--body); -webkit-font-smoothing: antialiased; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2 { font-weight: 400; text-wrap: balance; }
p { max-width: 65ch; text-wrap: pretty; }
em { font-family: var(--display); font-weight: 400; }
a { color: inherit; text-decoration: none; }
input, summary { font: inherit; }
a, input, summary { touch-action: manipulation; }
a:focus-visible, summary:focus-visible, input:focus-visible { outline: var(--focus-width) solid var(--accent); outline-offset: var(--focus-offset); }
a:active, summary:active { transform: translateY(var(--press)); }
::selection { background: var(--navy); color: var(--paper); }
.wrap { max-width: var(--max); margin-inline: auto; padding-inline: var(--page); }
.skip { position: fixed; top: var(--s2); left: var(--s2); z-index: 20; padding: var(--s2); background: var(--navy); color: var(--paper); transform: translateY(-200%); }
.skip:focus { transform: none; }

.site-header { border-bottom: var(--rule) solid var(--line); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--s4); padding-block: var(--s3); }
/* Preserve the selected paired-mark logo's forms, colors, and type metrics. */
.wordmark { color: var(--logo-ink); font-size: 1.75rem; line-height: 1; letter-spacing: -.07em; display: inline-flex; align-items: center; min-height: var(--control-size); font-weight: 600; flex-shrink: 0; }
.wordmark em { font-size: 2.2rem; line-height: .8; letter-spacing: -.045em; }
.peer-mark { display: flex; align-items: center; margin-right: .55rem; gap: var(--logo-gap); }
.peer-mark span { width: var(--logo-width); height: var(--logo-height); border: var(--rule) solid var(--accent); border-radius: 50%; }
.peer-mark span:last-child { transform: rotate(25deg); }
.nav { display: flex; align-items: center; flex-wrap: wrap; column-gap: clamp(1rem, 2.5vw, 2.5rem); font-size: var(--small); }
.nav a, .footer-links a { display: inline-flex; align-items: center; min-height: var(--control-size); border-bottom: var(--rule) solid transparent; }
.nav a:hover, .footer-links a:hover { color: var(--accent); border-color: currentColor; }
.arrow { display: inline-block; transition: transform var(--fast) var(--ease); }
a:hover .arrow { transform: translateY(var(--arrow-travel)); }
.button:hover .arrow { transform: translate(var(--arrow-travel), calc(-1 * var(--arrow-travel))); }

.hero { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr); gap: clamp(2rem, 4.2vw, 4.5rem); align-items: center; padding-block: clamp(2rem, 4vw, 3.5rem); }
.hero-copy { min-width: 0; }
.audience { display: inline-flex; align-items: center; gap: var(--s2); color: var(--navy); font-size: var(--fine); margin-bottom: var(--s3); }
.audience::before { content: ''; height: var(--rule); width: var(--s4); background: var(--navy); }
.hero h1 { font: 400 var(--hero-size)/.99 var(--display); letter-spacing: -.035em; }
.hero h1 span { display: block; }
.hero h1 em { color: var(--accent); white-space: nowrap; }
.respect-line { margin-top: var(--s3); font: 400 var(--respect-size)/1.3 var(--display); }
.hero-intro { margin-top: var(--s2); font-size: var(--body-size); line-height: 1.7; max-width: 44ch; }
.hero-index { margin-top: var(--s3); border-top: var(--rule) solid var(--line); }
.hero-row { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; align-items: center; gap: var(--s2); min-height: 3.3rem; padding-block: var(--s1); border-bottom: var(--rule) solid var(--line); }
.hero-row-name { font-weight: 600; font-size: var(--small); }
.hero-row:hover { color: var(--accent); }
.hero-row:hover .hero-row-name { text-decoration: underline; text-underline-offset: .25em; }
.status { display: inline-flex; align-items: center; flex-shrink: 0; border: var(--rule) solid currentColor; border-radius: var(--radius); padding: .2em .6em; color: var(--muted); font-size: var(--fine); line-height: 1.5; }
.button { display: inline-flex; align-items: center; justify-content: space-between; gap: var(--s4); min-height: 3.125rem; padding: .8rem 1.25rem; background: var(--navy); color: var(--paper); border: var(--rule) solid var(--navy); border-radius: var(--radius); font-size: var(--small); font-weight: 600; transition: background var(--fast) var(--ease); }
.button:hover { background: var(--navy-hover); }

.workbench { position: relative; min-width: 0; border: var(--rule) solid var(--navy); background: var(--sheet); box-shadow: var(--s1) var(--s1) 0 var(--wash); }
.bench-heading { display: flex; justify-content: space-between; align-items: center; gap: var(--s2); padding: var(--s2) var(--s3); background: var(--navy); color: var(--light-ink); font-size: var(--fine); }
.bench-heading p { font-weight: 600; }
.bench-heading > span { color: var(--light-muted); text-align: right; }
.scenario-select { display: none; margin: 0; padding: 0; border: 0; min-width: 0; }
.scenario-select legend { padding: var(--s2) var(--s3) 0; color: var(--muted); font-size: var(--fine); }
.picker { display: flex; padding: var(--s1) var(--s3) var(--s2); gap: var(--s1); border-bottom: var(--rule) solid var(--line); }
.choice { position: relative; display: flex; min-width: 0; flex: 1; }
.choice input { position: absolute; inset: 0; margin: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
.choice label { display: flex; align-items: center; justify-content: center; gap: var(--s1); width: 100%; min-height: var(--control-size); padding: var(--s1); border: var(--rule) solid var(--muted); border-radius: var(--radius); font-size: var(--fine); font-weight: 600; color: var(--navy); cursor: pointer; }
.choice input:checked + label { border-color: var(--navy); background: var(--navy); color: var(--paper); }
.choice input:hover + label { text-decoration: underline; text-underline-offset: .25em; }
.choice input:active + label { transform: translateY(var(--press)); }
.choice input:focus-visible + label { outline: var(--focus-width) solid var(--accent); outline-offset: var(--focus-offset); }
.folio { font: italic 1rem/1 var(--display); color: var(--accent); }
.choice input:checked + label .folio { color: var(--light-accent); }
.scenarios { padding: var(--s3); }
.scenario { min-width: 0; }
.scenario + .scenario { margin-top: var(--s4); }
.document-label, .diagram-caption { color: var(--muted); font-size: var(--fine); }
.document-label { margin-bottom: var(--s2); }
.document-question { font: 400 var(--document-size)/1.2 var(--display); padding-bottom: var(--s2); border-bottom: var(--rule) solid var(--line); max-width: 27ch; }
.criteria { margin: 0; padding: 0; list-style: none; }
.criteria li { display: grid; grid-template-columns: 5.75rem minmax(0, 1fr); gap: var(--s2); padding-block: .65rem; border-bottom: var(--rule) solid var(--line); font-size: var(--fine); }
.criteria strong { font-weight: 600; }
.criteria span { color: var(--muted); }
.peer-note { font: italic var(--note-size)/1.3 var(--display); color: var(--accent); padding-top: var(--s3); }
.bench-caption { padding: var(--s2) var(--s3); border-top: var(--rule) solid var(--line); color: var(--muted); font-size: var(--fine); line-height: 1.6; }
.source-path { list-style: none; margin: 0; padding: var(--s2) 0 0; }
.source-path li { display: grid; grid-template-columns: var(--s2) minmax(0, 1fr); column-gap: var(--s1); padding-block: var(--s0); font-size: var(--fine); }
.source-path li::before { content: '↳'; grid-row: span 2; color: var(--accent); }
.source-path strong { font-weight: 600; }
.source-path span { grid-column: 2; color: var(--muted); }
.course-pair { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); gap: var(--s2); align-items: start; margin-top: var(--s3); }
.course { border-block: var(--rule) solid var(--line); padding-block: var(--s2); }
.course strong { display: block; font-size: var(--fine); font-weight: 600; margin-bottom: var(--s1); }
.course p { font-size: var(--fine); line-height: 1.8; color: var(--muted); }
.course-join { color: var(--accent); padding-top: var(--s2); }

/* Native radios own selection. Hidden grid layers reserve the tallest scene's
   space without entering the accessibility tree or intercepting clicks.
   Unsupported browsers show all illustrations, without a non-working picker. */
@supports selector(:has(*)) {
  .scenario-select { display: block; }
  .scenarios { display: grid; }
  .scenario { grid-area: 1 / 1; visibility: hidden; pointer-events: none; }
  .scenario + .scenario { margin-top: 0; }
  .workbench:has(#scene-assessment:checked) .scenario-assessment,
  .workbench:has(#scene-research:checked) .scenario-research,
  .workbench:has(#scene-mobility:checked) .scenario-mobility { visibility: visible; pointer-events: auto; }
  .workbench:has(#scene-assessment:checked) .scenario-assessment > *,
  .workbench:has(#scene-research:checked) .scenario-research > *,
  .workbench:has(#scene-mobility:checked) .scenario-mobility > * { animation: margin-rise var(--enter) var(--ease) backwards; animation-delay: var(--delay, 0ms); }
  .scenario > :nth-child(2) { --delay: var(--stagger); }
  .scenario > :nth-child(3) { --delay: calc(2 * var(--stagger)); }
  .scenario > :nth-child(4) { --delay: calc(3 * var(--stagger)); }
}
@keyframes margin-rise {
  from { opacity: 0; transform: translateY(var(--rise)); }
  to { opacity: 1; transform: none; }
}

.tools { padding-top: var(--s4); padding-bottom: var(--section); }
.section-heading { display: flex; justify-content: space-between; align-items: baseline; gap: var(--s3); padding-bottom: var(--s3); color: var(--muted); font-size: var(--fine); }
.section-heading > p { font: 400 clamp(1.5rem, 2.5vw, 2rem)/1.2 var(--display); color: var(--ink); }
.grade { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); column-gap: clamp(2rem, 5vw, 5rem); row-gap: var(--s4); padding: clamp(1.5rem, 3.4vw, 3rem); background: var(--sheet); border-block: var(--rule) solid var(--line); }
.product-top { display: flex; align-items: center; flex-wrap: wrap; gap: var(--s2); margin-bottom: var(--s3); }
.product-name { font-size: var(--body-large); font-weight: 600; letter-spacing: -.02em; }
.product-head { font: 400 var(--heading-size)/1.05 var(--display); letter-spacing: -.025em; }
.product-head em { color: var(--accent); }
.product-copy { margin-top: var(--s3); font-size: var(--body-size); line-height: 1.8; max-width: 47ch; color: var(--muted); }
.product-intro .button { margin-top: var(--s4); }
.workflow { list-style: none; padding: 0; margin: 0; align-self: center; }
.workflow li { display: grid; grid-template-columns: var(--s4) minmax(0, 1fr); gap: var(--s2); padding-block: var(--s3); border-bottom: var(--rule) solid var(--line); }
.workflow li:first-child { padding-top: 0; }
.step { font: 400 2rem/1.1 var(--display); color: var(--accent); }
.workflow h3 { font-size: var(--body-size); font-weight: 600; }
.workflow p { margin-top: var(--s1); font-size: var(--small); line-height: 1.7; color: var(--muted); }
.control-note { grid-column: 1 / -1; display: flex; justify-content: space-between; gap: var(--s3); padding-top: var(--s3); border-top: var(--rule) solid var(--line); font-size: var(--small); }
.control-note strong { font-weight: 600; color: var(--navy); }
.control-note span { color: var(--muted); }

.library { background: var(--navy); color: var(--light-ink); padding-block: var(--section); }
.library .product-top { justify-content: space-between; }
.library .status, .library .diagram-caption { color: var(--light-muted); }
.library-layout { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: var(--s4) clamp(2rem, 6vw, 6rem); align-items: start; }
.library .product-head em { color: var(--light-accent); }
.library .product-copy { color: var(--light-muted); margin-top: 0; }
.connections { display: flex; align-items: center; flex-wrap: wrap; gap: var(--s2); padding-top: var(--s4); margin-top: var(--s4); border-top: var(--rule) solid var(--light-muted); font-size: var(--small); }
.connections > span:not(.connect) { padding: .65rem .9rem; border: var(--rule) solid var(--light-muted); }
.connections .connect { color: var(--light-accent); }
.diagram-caption { margin-top: var(--s2); }
.library-principles { margin: var(--s3) 0 0; }
.library-principles > div { margin-top: var(--s2); }
.library-principles dt { font-size: var(--small); font-weight: 600; }
.library-principles dd { margin: var(--s0) 0 0; font-size: var(--small); color: var(--light-muted); }
.disclosure { margin-top: var(--s3); }
.disclosure summary { list-style: none; cursor: pointer; min-height: var(--control-size); display: flex; align-items: center; justify-content: space-between; gap: var(--s3); padding-block: var(--s1); border-bottom: var(--rule) solid currentColor; font-size: var(--small); width: fit-content; max-width: 100%; }
.disclosure summary::-webkit-details-marker { display: none; }
.disclosure summary::marker { content: ''; }
.disclosure .plus { flex-shrink: 0; font-size: 1.4rem; line-height: 1; transition: transform var(--fast) var(--ease); }
.disclosure[open] .plus { transform: rotate(45deg); }
.disclosure > p { margin-top: var(--s2); font-size: var(--small); line-height: 1.8; }
.disclosure summary:hover { color: var(--accent); }
.library summary:hover { color: var(--light-accent); }
.library summary:focus-visible { outline-color: var(--light-accent); }
.library .disclosure > p { color: var(--light-muted); }

.mobility { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--s4) clamp(2rem, 6vw, 6rem); align-items: center; padding-block: var(--section); }
.equivalence { padding: var(--s4); background: var(--wash); border-block: var(--rule) solid var(--line); min-width: 0; }
.equivalence > figcaption { display: flex; flex-direction: column; gap: var(--s1); font-size: var(--small); font-weight: 600; }
.equivalence .document-label { font-weight: 400; }
.equivalence-columns { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--s3); padding-block: var(--s3); border-block: var(--rule) solid var(--muted); }
.equivalence h3 { font-size: var(--small); font-weight: 600; }
.equivalence ul { list-style: none; padding: 0; margin: var(--s2) 0 0; color: var(--muted); font-size: var(--small); }
.equivalence li + li { margin-top: var(--s1); }
.equivalence-question { margin-top: var(--s3); font: 400 clamp(1.7rem, 2.6vw, 2.5rem)/1.15 var(--display); }
.equivalence-question em { color: var(--accent); }
.equivalence .diagram-caption { margin-top: var(--s3); }

.manifesto { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: var(--s4) clamp(2rem, 6vw, 6rem); align-items: center; border-top: var(--rule) solid var(--line); padding-block: var(--section); }
.manifesto h2 { font: 400 var(--heading-size)/1.05 var(--display); letter-spacing: -.025em; }
.manifesto h2 em { color: var(--accent); }
.manifesto p { color: var(--muted); font-size: var(--small); line-height: 1.8; max-width: 48ch; }
.manifesto .approach-lead { margin-bottom: var(--s3); color: var(--ink); font-size: var(--body-large); line-height: 1.5; }
.site-footer { border-top: var(--rule) solid var(--line); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--s3); padding-block: var(--s3); flex-wrap: wrap; }
.footer-meta { color: var(--muted); font-size: var(--fine); }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--s1) var(--s3); font-size: var(--fine); }

@media (max-width: 1050px) {
  :root { --hero-size: clamp(3.6rem, 7.1vw, 5.5rem); --document-size: 1.75rem; }
  .hero { gap: var(--s4); }
  .picker { padding-inline: var(--s2); }
  .choice label { padding-inline: var(--s0); }
  .folio { display: none; }
  .bench-heading { padding-inline: var(--s2); }
  .scenarios { padding: var(--s2); }
  .criteria li { grid-template-columns: 4.5rem minmax(0, 1fr); gap: var(--s1); }
  .course-pair { gap: var(--s1); }
  .hero-row { gap: var(--s1); }
  .hero-row .status { font-size: .6875rem; }
  .connections { gap: var(--s1); }
}
@media (max-width: 800px) {
  :root { --section: 3.5rem; --hero-size: clamp(3.6rem, 10.5vw, 6rem); --heading-size: clamp(3rem, 7vw, 4rem); }
  .header-inner { gap: var(--s1); flex-wrap: wrap; padding-block: var(--s2); }
  .nav { font-size: var(--fine); }
  .hero { grid-template-columns: 1fr; gap: var(--s4); }
  .hero-copy { max-width: 38rem; width: 100%; justify-self: center; }
  .hero-index { max-width: 35rem; }
  .hero-row .status { font-size: var(--fine); }
  .workbench { max-width: 38rem; width: 100%; justify-self: center; }
  .folio { display: inline; }
  .grade { grid-template-columns: 1fr; }
  .control-note { flex-direction: column; gap: var(--s1); }
  .library-layout { grid-template-columns: 1fr; }
  .library .product-copy { max-width: 60ch; }
  .library-principles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s3); }
  .mobility { grid-template-columns: 1fr; }
  .manifesto { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  :root { --hero-size: clamp(3.15rem, 14vw, 5rem); --respect-size: 1.4rem; }
  .header-inner { justify-content: center; padding-block: var(--s1); }
  .wordmark { font-size: 1.5rem; }
  .wordmark em { font-size: 1.95rem; }
  .nav { justify-content: space-between; width: 100%; column-gap: var(--s2); }
  .nav .approach-link { display: none; }
  .hero { padding-top: var(--s4); }
  .audience { margin-bottom: var(--s2); }
  .hero-intro { font-size: var(--small); }
  .hero-row { min-height: 3.15rem; }
  .hero-row .status { font-size: .6875rem; }
  .bench-heading { gap: var(--s1); }
  .bench-heading > span { max-width: 14ch; }
  .scenario-select legend { padding-inline: var(--s2); }
  .choice label { font-size: var(--fine); gap: var(--s0); }
  .folio { display: none; }
  .bench-caption { padding-inline: var(--s2); }
  .section-heading { flex-direction: column; gap: var(--s1); }
  .grade { padding: var(--s3); }
  .product-copy { font-size: var(--small); }
  .workflow li { padding-block: var(--s2); }
  .library-principles { grid-template-columns: 1fr; gap: 0; }
  .connections { justify-content: space-between; gap: var(--s0); font-size: var(--fine); }
  .connections > span:not(.connect) { padding: .6rem .45rem; }
  .equivalence { padding: var(--s3); }
  .equivalence-columns { gap: var(--s2); }
  .equivalence h3, .equivalence ul { font-size: var(--fine); }
  .footer-inner { align-items: start; flex-direction: column; gap: var(--s1); }
  .footer-links { column-gap: var(--s3); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  a:active, summary:active, .choice input:active + label, .arrow { transform: none !important; }
}
@media (forced-colors: active) {
  .choice input:checked + label { outline: var(--focus-width) solid Highlight; outline-offset: calc(-1 * var(--focus-width)); }
  .choice input:focus-visible + label { outline-offset: var(--focus-offset); }
  .workbench, .equivalence { border: var(--rule) solid CanvasText; }
}