/* 01 Tokens & Reset */
:root {
  --ink: #191b24; --aubergine: #35263d; --violet: #594966; --slate: #50657a;
  --parchment: #f1ece3; --paper: #fbf8f3; --line: #d4d0c7; --muted: #68686e;
  --coral: #c46b55; --mist: #dce4e5; --white: #fff;
  --sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: Georgia, "Times New Roman", serif;
  --step--1: .78rem; --step-0: clamp(.98rem, .93rem + .18vw, 1.08rem); --step-1: clamp(1.2rem, 1.05rem + .5vw, 1.55rem);
  --step-2: clamp(1.65rem, 1.25rem + 1.4vw, 2.7rem); --step-3: clamp(2.8rem, 1.8rem + 4.2vw, 6.7rem);
  --space-1: .5rem; --space-2: 1rem; --space-3: 1.5rem; --space-4: 2.5rem; --space-5: 4rem; --space-6: clamp(5rem, 10vw, 9rem);
  --container: 86rem; --border: 1px; --radius: 2px; --shadow: 0 18px 50px rgba(25,27,36,.08); --transition: 220ms ease;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-padding-top: 6rem; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 400 var(--step-0)/1.65 var(--sans); overflow-x: hidden; }
main > *, .hero-intro > *, .section-heading > *, .crossings-grid > *, .scope-grid > *, .about-grid > *, .cta-field > * { min-width: 0; }
img, svg { display: block; max-width: 100%; }
button, input { font: inherit; }
a { color: inherit; }

/* 02 Base */
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.04; letter-spacing: -.035em; }
h1 { max-width: 15ch; margin: .45em 0 .55em; font-size: var(--step-3); font-weight: 590; }
h2 { margin-bottom: .45em; font-size: var(--step-2); font-weight: 570; }
h3 { font-size: var(--step-1); }
p { color: #414149; }
.eyebrow, .section-kicker { color: var(--coral); font-size: var(--step--1); font-weight: 750; letter-spacing: .16em; text-transform: uppercase; }
.button { display: inline-flex; min-height: 3.15rem; align-items: center; justify-content: center; padding: .75rem 1.15rem; border: 1px solid transparent; text-decoration: none; transition: background var(--transition), color var(--transition), border-color var(--transition); }
.button-primary { background: var(--aubergine); color: var(--white); }
.button-primary:hover { background: var(--violet); }
.button-text { gap: 1rem; border-bottom-color: var(--aubergine); }

/* 03 Accessibility */
.skip-link { position: fixed; z-index: 100; top: .5rem; left: .5rem; padding: .75rem 1rem; background: var(--white); transform: translateY(-160%); }
.skip-link:focus { transform: none; }
:focus-visible { outline: 3px solid var(--coral); outline-offset: 3px; }
[hidden] { display: none !important; }
.copy-fallback { position: fixed; left: -9999px; }

/* 04 Layout */
.container { width: min(calc(100% - 2.5rem), var(--container)); margin-inline: auto; }
.section { padding-block: var(--space-6); }
.section-heading { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(18rem, .8fr); gap: var(--space-5); align-items: end; margin-bottom: var(--space-5); }
.section-heading > p { max-width: 42rem; margin-bottom: .5rem; }

/* 05 Header */
.site-header { position: sticky; z-index: 20; top: 0; border-bottom: 1px solid rgba(212,208,199,.8); background: rgba(251,248,243,.94); backdrop-filter: blur(12px); }
.header-inner { display: flex; min-height: 5rem; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { width: clamp(13rem, 20vw, 18rem); }
.primary-nav { display: flex; align-items: center; gap: clamp(.8rem, 1.4vw, 1.6rem); font-size: .83rem; }
.primary-nav a { text-decoration: none; white-space: nowrap; }
.primary-nav a:not(.nav-action):hover { color: var(--coral); }
.nav-action { padding: .55rem .85rem; border: 1px solid var(--aubergine); }
.menu-toggle { display: none; width: 3rem; height: 3rem; border: 1px solid var(--line); background: transparent; }
.menu-toggle span { display: block; width: 1.25rem; height: 1px; margin: .32rem auto; background: var(--ink); transition: transform var(--transition); }

/* 06 Hero */
.hero { padding: clamp(4rem, 7vw, 7rem) 0 3rem; background: linear-gradient(90deg, var(--paper) 0 70%, var(--parchment) 70%); }
.hero-intro { display: grid; grid-template-columns: minmax(20rem, 1fr) auto; gap: 1rem 3rem; align-items: center; margin-left: clamp(0rem, 12vw, 11rem); }
.hero-intro > p { max-width: 48rem; font-size: var(--step-1); }
.hero-intro small { grid-column: 1 / -1; color: var(--muted); }
.hero-actions { display: flex; gap: .7rem; flex-wrap: wrap; }

/* 07 Passage Map */
.passage-map { margin-top: var(--space-5); border: 1px solid var(--line); background: var(--white); box-shadow: var(--shadow); }
.map-head { display: flex; justify-content: space-between; padding: .8rem 1rem; border-bottom: 1px solid var(--line); color: var(--muted); font-size: .68rem; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; }
.map-canvas { position: relative; min-height: 22rem; overflow: hidden; background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 4.5rem 4.5rem; }
.route { position: absolute; height: 2px; background: var(--aubergine); }
.route::after { content: ""; position: absolute; right: 0; width: 2px; background: inherit; }
.route-a { top: 40%; left: 8%; width: 37%; }.route-a::after { height: 4.5rem; top: 0; }
.route-b { top: calc(40% + 4.5rem); left: 45%; width: 27%; }.route-b::after { height: 3rem; bottom: 0; transform: translateY(100%); }
.route-c { top: calc(40% + 7.5rem); left: 72%; width: 20%; }
.junction { position: absolute; min-width: 8.2rem; padding: .75rem; border: 1px solid var(--aubergine); border-right: 0; background: var(--paper); }
.junction i { position: absolute; width: 9px; height: 9px; background: var(--coral); top: -.3rem; left: -.3rem; }
.junction strong, .junction small { display: block; }.junction strong { text-transform: uppercase; letter-spacing: .1em; }.junction small { margin-top: .25rem; color: var(--muted); font-size: .62rem; }
.j1 { top: 28%; left: 8%; }.j2 { top: 28%; left: 36%; }.j3 { top: 48%; left: 64%; }.j4 { top: 65%; right: 8%; }
.flow-label { position: absolute; padding: .15rem .45rem; background: var(--mist); color: var(--slate); font: 700 .62rem var(--sans); letter-spacing: .1em; text-transform: uppercase; }
.fl-1 { left: 15%; bottom: 12%; }.fl-2 { left: 34%; bottom: 8%; }.fl-3 { left: 53%; top: 12%; }.fl-4 { right: 20%; top: 17%; }.fl-5 { right: 5%; top: 36%; }

/* 08 System Snapshot */
.snapshot { padding: 2rem 0 4rem; background: var(--parchment); }
.snapshot-strip { display: grid; grid-template-columns: 1fr 1.2fr .9fr 1.1fr; border-top: 1px solid var(--aubergine); }
.snapshot-strip article { position: relative; padding: 1.6rem 1.4rem 1rem; border-right: 1px solid var(--line); }
.snapshot-strip article:nth-child(2) { padding-top: 2.8rem; }.snapshot-strip article:nth-child(4) { padding-top: 2.2rem; border-right: 0; }
.snapshot-strip article::before { content: ""; position: absolute; top: -5px; left: 1.4rem; width: 9px; height: 9px; background: var(--coral); }
.snapshot-strip span { color: var(--muted); font-size: .68rem; }.snapshot-strip h2 { margin: .7rem 0; font-size: 1.05rem; }.snapshot-strip p { margin: 0; font-size: .84rem; }

/* 09 System Domains */
.domain-grid { display: grid; grid-template-columns: .7fr 1.25fr .78fr; gap: 1.25rem; align-items: start; }
.domain { position: relative; min-height: 27rem; padding: 2rem; border: 1px solid var(--line); background: var(--white); }
.domain::after { content: ""; position: absolute; width: 28%; height: 4px; top: -2px; right: 0; background: var(--coral); }
.domain-two { min-height: 34rem; margin-top: 4rem; background: var(--aubergine); color: var(--white); }.domain-two p { color: #ded6e3; }.domain-two::after { width: 42%; left: 0; }
.domain-three { margin-top: 1.5rem; }.domain-four { grid-column: 1 / 3; min-height: auto; margin: -4.5rem 0 0 4rem; padding-right: 18%; background: var(--mist); }
.domain-meta { display: flex; justify-content: space-between; color: var(--coral); font-weight: 750; }.domain-meta small { text-transform: uppercase; letter-spacing: .12em; }
.domain h3 { margin: 4rem 0 1rem; }.domain strong { display: block; margin-bottom: .8rem; font-family: var(--serif); font-weight: 400; font-style: italic; }
.domain ul { display: flex; flex-wrap: wrap; gap: .4rem; padding: 0; list-style: none; }.domain li { padding: .25rem .5rem; border: 1px solid currentColor; font-size: .69rem; }

/* 10 Crossings */
.crossings { background: var(--ink); color: var(--white); }.crossings p { color: #c9c9cd; }
.crossings-grid { display: grid; grid-template-columns: 1fr .9fr; gap: clamp(3rem, 8vw, 8rem); align-items: center; }
.crossing-copy blockquote { margin: 2.5rem 0 0; padding: 1.5rem 0 0 2rem; border-top: 1px solid #51525a; border-left: 4px solid var(--coral); color: var(--parchment); font-family: var(--serif); font-size: 1.2rem; }
.crossing-visual { position: relative; min-height: 30rem; border: 1px solid #51525a; background: repeating-linear-gradient(90deg, transparent 0 5.9rem, rgba(255,255,255,.05) 6rem); }
.crossing-visual i, .crossing-visual b { position: absolute; display: block; }.line-h { top: 51%; left: 8%; width: 84%; height: 2px; background: var(--coral); }.line-v { top: 10%; left: 58%; width: 2px; height: 80%; background: var(--slate); }
.window { border: 1px solid var(--parchment); }.w1 { width: 35%; height: 30%; top: 15%; left: 14%; border-right: 0; }.w2 { width: 29%; height: 32%; right: 9%; bottom: 12%; border-left: 0; }
.node { width: 10px; height: 10px; background: var(--coral); }.n1 { left: 12%; top: calc(51% - 4px); }.n2 { left: calc(58% - 4px); top: 18%; }.n3 { right: 7%; top: calc(51% - 4px); }
.cv-label { position: absolute; font-size: .65rem; letter-spacing: .12em; text-transform: uppercase; }.l1 { top: 8%; left: 14%; }.l2 { top: 44%; right: 8%; }.l3 { bottom: 6%; left: 12%; }.l4 { bottom: 17%; right: 13%; }

/* 11 Channel Trace */
.trace { background: var(--parchment); }.trace-grid { position: relative; display: grid; grid-template-columns: repeat(3, 1fr); gap: 5rem 2rem; padding: 0; list-style: none; }
.trace-grid::before { content: ""; position: absolute; z-index: 0; left: 8%; right: 8%; top: 50%; height: 1px; background: var(--coral); }
.trace-grid li { position: relative; z-index: 1; min-height: 15rem; padding: 1.5rem; border: 1px solid var(--line); border-bottom: 0; background: var(--paper); }
.trace-grid li:nth-child(2), .trace-grid li:nth-child(5) { transform: translateY(2rem); }.trace-grid li::before { content: ""; position: absolute; left: -5px; top: 3rem; width: 9px; height: 9px; background: var(--coral); }
.trace-grid span { color: var(--coral); font-size: .72rem; font-weight: 800; }.trace-grid h3 { margin: 2.5rem 0 .8rem; font-size: 1.15rem; }.trace-grid p { margin: 0; font-size: .9rem; }

/* 12 Reference Matrix */
.profile-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.2rem; align-items: start; }
.contact-clarification { margin-bottom: 2rem; padding: 1.25rem 1.5rem; border-left: 4px solid var(--coral); background: var(--parchment); color: #414149; }
.profile { min-width: 0; padding: 1.6rem; border: 1px solid var(--line); background: var(--white); }.profile.offset { margin-top: 2rem; }.profile.contact { border-top: 4px solid var(--coral); }.profile.research { border-top: 4px solid var(--slate); background: #f4f6f5; }
.profile header { display: flex; gap: 1rem; align-items: center; }.avatar { display: grid; flex: 0 0 3.3rem; aspect-ratio: 1; place-items: center; border: 1px solid currentColor; color: var(--aubergine); font-weight: 750; }.research .avatar { color: var(--slate); }
.profile small { color: var(--coral); font-size: .65rem; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }.research small { color: var(--slate); }.profile h3 { margin: .25rem 0 0; font-size: 1.15rem; }.profile p { font-size: .87rem; }.institution { margin: 1.5rem 0 .7rem; padding-top: .8rem; border-top: 1px solid var(--line); font-weight: 700; }
.email-row { display: flex; flex-direction: column; gap: .6rem; padding-top: 1rem; border-top: 1px solid var(--line); }.email-row a { overflow-wrap: anywhere; font-size: .76rem; }.copy-email { width: fit-content; padding: .5rem .75rem; border: 1px solid var(--aubergine); background: transparent; cursor: pointer; }

/* 13 Scope & Independence */
.scope { background: var(--mist); }.scope-grid { display: grid; grid-template-columns: .7fr 1.3fr; gap: 7vw; }.scope-title { padding-right: 2rem; border-right: 1px solid var(--slate); }.scope-title span { color: var(--slate); font-family: var(--serif); font-style: italic; }.scope-copy p { padding-bottom: 1rem; border-bottom: 1px solid #bdcacc; }

/* 14 Interface Notes */
.notes { background: var(--paper); }.note-list { border-top: 1px solid var(--ink); }.note { border-bottom: 1px solid var(--line); }.note details { padding: 0 1rem; }.note summary { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: center; padding: 1.6rem 0; cursor: pointer; list-style: none; }.note summary::-webkit-details-marker { display: none; }.note summary span { display: grid; grid-template-columns: 12rem 1fr 1fr; gap: 2rem; align-items: baseline; }.note summary small { color: var(--coral); font-size: .66rem; letter-spacing: .09em; text-transform: uppercase; }.note summary strong { font-size: 1.05rem; }.note summary em { color: var(--muted); font-family: var(--serif); font-size: .9rem; }.note summary b { font-size: 1.5rem; font-weight: 300; transition: transform var(--transition); }.note details[open] summary b { transform: rotate(45deg); }.note-body { max-width: 52rem; margin: 0 auto; padding: 1rem 0 2rem; }.note-body ul { display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; list-style: none; }.note-body li { padding: .2rem .5rem; background: var(--mist); color: var(--slate); font-size: .68rem; }

/* 15 Search */
.search-panel { display: grid; grid-template-columns: 1fr auto; gap: .6rem 2rem; max-width: 58rem; margin-bottom: 3rem; }.search-panel label { grid-column: 1 / -1; font-weight: 700; }.search-row { display: flex; border-bottom: 2px solid var(--aubergine); }.search-row input { width: 100%; min-height: 3.5rem; padding: .8rem 0; border: 0; background: transparent; color: var(--ink); }.search-row input:focus { outline: 0; }.search-row button { border: 0; background: transparent; color: var(--coral); cursor: pointer; white-space: nowrap; }.search-panel > p { align-self: center; margin: 0; color: var(--muted); font-size: .8rem; }.no-results { padding: 2rem; border: 1px solid var(--coral); }

/* 16 About */
.about { background: var(--white); }.about-grid { display: grid; grid-template-columns: .45fr 1fr; gap: 8vw; }.about-index { display: flex; flex-direction: column; justify-content: space-between; min-height: 18rem; padding: 2rem; border: 1px solid var(--line); border-right: 0; }.about-index span { color: var(--slate); font-size: .7rem; letter-spacing: .15em; }

/* 17 System Principles */
.principles { background: var(--parchment); }.principle-list { display: grid; grid-template-columns: repeat(5, 1fr); padding: 0; border-top: 1px solid var(--aubergine); list-style: none; }.principle-list li { position: relative; padding: 2rem 1.3rem; border-right: 1px solid var(--line); }.principle-list li:last-child { border: 0; }.principle-list li::before { content: ""; position: absolute; top: -5px; width: 9px; height: 9px; background: var(--coral); }.principle-list span { color: var(--muted); font-size: .7rem; }.principle-list h3 { margin-top: 3rem; font-size: 1rem; }.principle-list p { font-size: .82rem; }

/* 18 Final CTA */
.final-cta { padding: var(--space-6) 0; background: var(--paper); }.cta-field { position: relative; display: grid; grid-template-columns: 1fr .85fr; gap: 5vw; padding: clamp(2rem, 6vw, 6rem); overflow: hidden; background: var(--aubergine); color: var(--white); }.cta-field h2 { max-width: 18ch; }.cta-route { position: absolute; left: 0; right: 18%; bottom: 22%; height: 2px; background: var(--coral); }.cta-route::after { content: ""; position: absolute; right: -5px; top: -4px; width: 10px; height: 10px; background: var(--coral); }.cta-inset { position: relative; z-index: 1; padding: 2rem; background: var(--parchment); color: var(--ink); }.cta-inset div { display: flex; gap: .6rem; flex-wrap: wrap; }.button-light { background: var(--white); border-color: var(--white); }.button-ghost { border-color: var(--aubergine); }

/* 19 Footer */
.site-footer { padding: 4rem 0 2rem; background: var(--ink); color: var(--white); }.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr auto; gap: 4rem; }.footer-brand { display: flex; gap: 1rem; }.footer-brand img { filter: brightness(0) invert(1); }.footer-brand p { margin: .25rem 0; color: #c8c8cb; }.footer-brand small { color: #98989f; }.site-footer nav { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem 2rem; }.site-footer nav a { color: #d5d5d7; font-size: .85rem; text-decoration: none; }.back-top { align-self: start; border: 0; background: transparent; color: var(--white); cursor: pointer; }.footer-bottom { display: flex; justify-content: space-between; gap: 2rem; margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid #3e3f47; }.footer-bottom p { max-width: 50rem; margin: 0; color: #92939a; font-size: .72rem; }

/* 20 Reveal */
.js-enabled .reveal { opacity: 0; transform: translateY(18px); transition: opacity 650ms ease, transform 650ms ease; }.js-enabled .reveal.is-visible { opacity: 1; transform: none; }

/* 21 Responsive */
@media (max-width: 1050px) {
  .menu-toggle { display: block; }
  .primary-nav { position: fixed; inset: 5rem 0 auto; display: grid; gap: 0; padding: 1rem 1.25rem 2rem; border-bottom: 1px solid var(--line); background: var(--paper); opacity: 0; visibility: hidden; transform: translateY(-1rem); transition: var(--transition); }
  .primary-nav a { padding: .75rem 0; }.primary-nav .nav-action { margin-top: .5rem; padding-inline: .8rem; }
  .menu-open .primary-nav { opacity: 1; visibility: visible; transform: none; }.menu-open .menu-toggle span:first-child { transform: translateY(3px) rotate(45deg); }.menu-open .menu-toggle span:last-child { transform: translateY(-3px) rotate(-45deg); }
  .profile-grid { grid-template-columns: repeat(2, 1fr); }.profile.offset { margin-top: 0; }
  .principle-list { grid-template-columns: repeat(3, 1fr); }.principle-list li { border-bottom: 1px solid var(--line); }
}
@media (max-width: 768px) {
  .container { width: min(calc(100% - 2rem), var(--container)); }.section { padding-block: 4.5rem; }
  .section-heading, .hero-intro, .crossings-grid, .scope-grid, .about-grid, .cta-field, .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .hero { background: var(--paper); }.hero-intro { margin-left: 0; }.hero-intro small { grid-column: auto; }
  .map-canvas { min-height: 29rem; background-size: 3rem 3rem; }.junction { min-width: 7rem; }.j1 { top: 15%; left: 7%; }.j2 { top: 33%; left: 38%; }.j3 { top: 51%; left: 15%; }.j4 { top: 70%; right: 6%; }.route { display: none; }.flow-label { font-size: .55rem; }.fl-1 { bottom: 7%; }.fl-2 { left: 54%; bottom: 6%; }.fl-3 { left: auto; right: 4%; top: 9%; }.fl-4 { right: 5%; top: 29%; }.fl-5 { right: auto; left: 6%; top: 44%; }
  .snapshot-strip { grid-template-columns: 1fr 1fr; }.snapshot-strip article { border-bottom: 1px solid var(--line); }
  .domain-grid { grid-template-columns: 1fr 1fr; }.domain { min-height: 0; }.domain-two, .domain-three, .domain-four { margin: 0; }.domain-four { grid-column: 1 / -1; }
  .trace-grid { grid-template-columns: 1fr 1fr; gap: 1rem; }.trace-grid::before { display: none; }.trace-grid li:nth-child(2), .trace-grid li:nth-child(5) { transform: none; }
  .note summary span { grid-template-columns: 1fr; gap: .35rem; }.profile-grid { grid-template-columns: repeat(2, 1fr); }
  .scope-title { border-right: 0; border-bottom: 1px solid var(--slate); padding: 0 0 2rem; }
  .principle-list { grid-template-columns: 1fr 1fr; }.cta-route { bottom: 10%; }.footer-bottom { flex-direction: column; }
}
@media (max-width: 520px) {
  h1 { font-size: clamp(2.55rem, 13vw, 4.2rem); }.brand { width: 12.5rem; }.header-inner { min-height: 4.5rem; }.primary-nav { top: 4.5rem; }
  .hero-actions, .cta-inset div { flex-direction: column; align-items: stretch; }.button { width: 100%; padding-inline: .75rem; white-space: normal; }.map-head { gap: 1rem; }
  .snapshot-strip, .domain-grid, .trace-grid, .profile-grid, .principle-list { grid-template-columns: 1fr; }.domain-four { grid-column: auto; }
  .snapshot-strip article:nth-child(n) { padding-top: 1.6rem; border-right: 0; }
  .trace-grid li { min-height: 0; }.profile { padding: 1.25rem; }.profile header { align-items: flex-start; }
  .search-panel { grid-template-columns: 1fr; }.search-panel > p { grid-row: 2; }.search-row { grid-row: 3; min-width: 0; }.search-row input { min-width: 0; font-size: .88rem; }
  .note details { padding: 0 .25rem; }.note summary { gap: 1rem; }.about-index { min-height: 10rem; }.site-footer nav { grid-template-columns: 1fr; }.footer-grid { gap: 2.5rem; }
}

/* 22 Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; } *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .js-enabled .reveal { opacity: 1; transform: none; }
}