@font-face {
  font-family: "Inter";
  src: url("assets/fonts/InterVariable.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("assets/fonts/IBMPlexMonoVariable.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 700;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --graphite: #0d0f12;
  --surface: #14181c;
  --surface-raised: #191e23;
  --ivory: #f4f1e9;
  --muted: #aab0b4;
  --ice: #91c4d6;
  --ice-strong: #b9dce8;
  --line: #2a3036;
  --line-soft: #20262c;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --sans: "Inter", Arial, sans-serif;
  background: var(--graphite);
  color: var(--ivory);
  font-family: var(--sans);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { background: var(--graphite); scroll-behavior: auto; }
body { margin: 0; background: var(--graphite); font-size: 17px; font-weight: 450; line-height: 1.6; text-rendering: optimizeLegibility; }
a { color: inherit; text-underline-offset: .24em; text-decoration-thickness: 1px; }
a:hover { color: var(--ice); }
a:focus-visible { outline: 2px solid var(--ice); outline-offset: 5px; }
p, h1, h2, h3 { margin: 0; }
h1, h2, h3 { font-weight: 590; letter-spacing: -.025em; line-height: 1.08; text-wrap: balance; }
p { text-wrap: pretty; }
img { display: block; max-width: 100%; }
.wrap { width: min(1200px, calc(100% - 96px)); margin-inline: auto; }
.skip-link { position: fixed; left: 16px; top: 12px; z-index: 10; padding: 10px 16px; color: var(--graphite); background: var(--ice); transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.eyebrow, .index { color: var(--ice); font: 500 11px/1.45 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.lede { color: var(--ivory); font-size: clamp(20px, 2.1vw, 28px); font-weight: 450; line-height: 1.45; letter-spacing: normal; }

.site-header { min-height: 96px; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 20px; font-weight: 650; letter-spacing: .09em; text-decoration: none; white-space: nowrap; }
.brand small { margin-left: 3px; color: var(--muted); font: 500 10px var(--mono); letter-spacing: .05em; }
.site-header nav { display: flex; align-items: center; gap: clamp(18px, 3vw, 38px); }
.site-header nav a { position: relative; padding-block: 13px; color: var(--muted); font-size: 14px; font-weight: 500; text-decoration: none; }
.site-header nav a:hover, .site-header nav a[aria-current="page"] { color: var(--ivory); }
.site-header nav a[aria-current="page"]::after { content: ""; position: absolute; right: 0; bottom: 5px; left: 0; height: 1px; background: var(--ice); }

.home-hero { min-height: 660px; padding-block: clamp(90px, 12vw, 150px) 82px; display: flex; flex-direction: column; justify-content: space-between; border-bottom: 1px solid var(--line); }
h1 { margin-top: 25px; font-size: clamp(58px, 8.2vw, 110px); letter-spacing: -.04em; }
.hero-accent { color: var(--ice); font-weight: 620; }
.hero-bottom { margin-top: 110px; display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: end; }
.hero-bottom .lede { max-width: 630px; }
.actions { display: flex; justify-content: flex-end; align-items: center; gap: 28px; flex-wrap: wrap; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: space-between; gap: 35px; padding: 12px 18px; color: var(--graphite); background: var(--ice); border: 1px solid var(--ice); font-size: 13px; font-weight: 650; text-decoration: none; }
.button:hover { color: var(--graphite); background: var(--ice-strong); border-color: var(--ice-strong); }
.quiet-link, .section-link { font-size: 13px; }

.section { padding-block: clamp(78px, 9vw, 118px); border-bottom: 1px solid var(--line); }
.section-intro { display: grid; grid-template-columns: 180px minmax(260px, 1.1fr) minmax(260px, .9fr); align-items: start; gap: 34px; margin-bottom: 65px; }
.section-intro h2 { font-size: clamp(34px, 4vw, 54px); }
.section-intro > p:last-child { max-width: 450px; color: var(--muted); font-size: 16px; }
.section-intro.compact { grid-template-columns: 180px 1fr; }
.core-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 42px; }
.core-grid article { min-height: 260px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; flex-direction: column; }
.core-grid h3 { margin-block: 42px 22px; font-size: clamp(38px, 4.5vw, 60px); }
.core-grid article > p:last-child { margin-top: auto; max-width: 310px; color: var(--muted); font-size: 16px; }
.section-link { display: inline-flex; gap: 18px; margin-top: 44px; padding-block: 8px; }

.evidence-list, .artifact-list { border-top: 1px solid var(--line); }
.evidence-list > a { display: grid; grid-template-columns: 1fr 1.15fr auto; align-items: center; gap: 36px; min-height: 112px; border-bottom: 1px solid var(--line); text-decoration: none; }
.evidence-list strong, .artifact-list strong { display: block; font-weight: 580; font-size: 18px; }
.evidence-list small { display: block; margin-top: 6px; color: var(--ice); font: 500 10px var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.evidence-list > a > span:nth-child(2) { color: var(--muted); font-size: 15px; }
.evidence-list b, .artifact-list b { font-weight: 400; }

.principle { padding-block: clamp(95px, 12vw, 160px); display: grid; grid-template-columns: 180px 1.25fr .75fr; gap: 34px; border-bottom: 1px solid var(--line); }
.principle h2 { font-size: clamp(42px, 5.4vw, 72px); }
.principle > p:nth-of-type(2) { align-self: end; color: var(--muted); font-size: 16px; }
.principle .section-link { grid-column: 2; margin-top: 8px; }
.home-contact { padding-block: clamp(80px, 10vw, 130px); display: grid; grid-template-columns: 1fr 1fr; gap: 80px; }
.home-contact h2 { margin-top: 24px; font-size: clamp(40px, 5vw, 66px); }
.home-contact > div:last-child { align-self: end; }
.home-contact > div:last-child p { max-width: 430px; color: var(--muted); font-size: 17px; }
.home-contact .button { margin-top: 32px; }

.page-hero { min-height: 540px; padding-block: clamp(85px, 11vw, 140px) 75px; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 180px 1fr; grid-template-rows: auto 1fr; gap: 22px 34px; }
.page-hero .eyebrow { padding-top: 15px; }
.page-hero h1 { margin: 0; font-size: clamp(56px, 7.5vw, 96px); }
.page-hero .lede { grid-column: 2; max-width: 760px; margin-top: 35px; align-self: end; }

.architecture { padding-top: clamp(78px, 9vw, 118px); }
.architecture-flow { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.architecture-flow > li { position: relative; display: grid; grid-template-columns: 180px .8fr 1.2fr; gap: 34px; padding-block: 46px; border-bottom: 1px solid var(--line); }
.architecture-flow > li:not(:last-child)::after { content: "↓"; position: absolute; left: 7px; bottom: -14px; z-index: 1; width: 27px; color: var(--ice); background: var(--graphite); text-align: center; }
.arch-meta { display: flex; flex-direction: column; gap: 10px; color: var(--muted); font: 500 10px/1.4 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.arch-meta span:first-child { color: var(--ice); }
.arch-name h3 { font-size: clamp(38px, 4.2vw, 58px); }
.arch-name p { margin-top: 8px; color: var(--muted); font-size: 14px; }
.arch-copy p { max-width: 550px; color: #d0d1cd; }
.arch-copy a { display: inline-block; margin-top: 24px; font-size: 14px; }
.relationship-note { margin-left: 180px; padding: 28px 0 70px 34px; display: grid; grid-template-columns: .8fr 1.2fr; gap: 34px; border-left: 1px solid var(--ice); }
.relationship-note p { max-width: 550px; color: var(--muted); font-size: 15px; }
.system-rows { border-top: 1px solid var(--line); }
.system-rows article { min-height: 155px; display: grid; grid-template-columns: .8fr 1.25fr auto; align-items: center; gap: 42px; border-bottom: 1px solid var(--line); }
.system-rows h3 { margin-top: 8px; font-size: 29px; }
.system-rows article > p { max-width: 520px; color: var(--muted); font-size: 15px; }
.system-rows a { font-size: 13px; }

.evidence-boundary { padding-block: 48px; display: grid; grid-template-columns: 180px 1fr; gap: 34px; border-bottom: 1px solid var(--line); }
.evidence-boundary h2 { max-width: 820px; font-size: clamp(27px, 3.4vw, 43px); }
.evidence-boundary div p { max-width: 690px; margin-top: 22px; color: var(--muted); font-size: 15px; }
.agenda, .principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 42px; }
.agenda article, .principles article { min-height: 310px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; flex-direction: column; }
.agenda h3, .principles h3 { margin-block: 35px 20px; font-size: 24px; line-height: 1.2; }
.agenda p, .principles p { color: var(--muted); font-size: 15px; }
.agenda a { margin-top: auto; padding-top: 25px; font-size: 13px; }
.artifact-list > a { min-height: 105px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 35px; border-bottom: 1px solid var(--line); text-decoration: none; }
.artifact-list small { display: block; max-width: 700px; margin-top: 7px; color: var(--muted); font-size: 14px; }
.principles { grid-template-columns: repeat(2, 1fr); gap: 55px 42px; }
.principles article { min-height: 245px; }
.validation-flow { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 42px; }
.validation-flow li { padding-top: 24px; border-top: 1px solid var(--line); }
.validation-flow li > span { color: var(--ice); font: 500 11px var(--mono); }
.validation-flow h3 { margin-block: 38px 18px; font-size: 23px; }
.validation-flow p { color: var(--muted); font-size: 15px; }

.stack { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 65px 42px; }
.stack-group { min-width: 0; }
.stack-group > h3 { margin-bottom: 18px; color: var(--ice); font: 500 10px var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.stack-group ul { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.stack-group li { min-height: 70px; border-bottom: 1px solid var(--line-soft); }
.technology { display: flex; align-items: center; gap: 17px; }
.technology img { width: 74px; height: 30px; object-fit: contain; object-position: left center; }
.technology.icon-only img { width: 29px; height: 29px; }
.technology.mono-mark img { filter: invert(1); }
.technology span, .text-technology { color: #d4d3ce; font: 450 14px var(--sans); }
.text-technology { display: flex; align-items: center; }
.trademark-note { max-width: 760px; margin-top: 55px; color: #899095; font-size: 12px; }

.contact-page { min-height: calc(100vh - 168px); padding-block: clamp(80px, 11vw, 145px); display: grid; grid-template-columns: 1fr 1fr; gap: 70px 90px; }
.contact-statement h1 { margin-block: 27px 40px; font-size: clamp(54px, 7vw, 92px); }
.contact-statement .lede { max-width: 650px; }
.contact-details { align-self: center; font-style: normal; border-top: 1px solid var(--line); }
.contact-details a { min-height: 108px; display: grid; grid-template-columns: 90px 1fr auto; align-items: center; gap: 20px; border-bottom: 1px solid var(--line); text-decoration: none; }
.contact-details span { color: var(--muted); font: 500 10px var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.contact-details strong { font-size: clamp(17px, 1.7vw, 23px); font-weight: 450; overflow-wrap: anywhere; }
.contact-details b { font-weight: 400; }
.contact-note { grid-column: 2; max-width: 570px; color: var(--muted); font-size: 14px; }

.next-page { padding-block: 58px 70px; }
.next-page > a { margin-top: 20px; display: flex; justify-content: space-between; align-items: center; gap: 30px; font-size: clamp(27px, 3.2vw, 42px); font-weight: 580; letter-spacing: -.025em; text-decoration: none; }
.next-page b { font-weight: 400; }
.site-footer { min-height: 72px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; gap: 25px; color: #899095; font-size: 12px; }
.site-footer a { padding-block: 10px; }

@media (max-width: 900px) {
  .wrap { width: calc(100% - 64px); }
  .hero-bottom, .home-contact { gap: 45px; }
  .section-intro { grid-template-columns: 140px 1fr; }
  .section-intro > p:last-child { grid-column: 2; }
  .section-intro.compact { grid-template-columns: 140px 1fr; }
  .principle { grid-template-columns: 140px 1fr; }
  .principle > p:nth-of-type(2) { grid-column: 2; }
  .principle .section-link { grid-column: 2; }
  .page-hero { grid-template-columns: 140px 1fr; }
  .architecture-flow > li { grid-template-columns: 140px .75fr 1.25fr; }
  .relationship-note { margin-left: 140px; }
  .agenda { grid-template-columns: 1fr; gap: 32px; }
  .agenda article { min-height: 230px; }
  .stack { grid-template-columns: repeat(2, 1fr); }
  .contact-page { grid-template-columns: 1fr; }
  .contact-note { grid-column: 1; }
}

@media (max-width: 640px) {
  .wrap { width: calc(100% - 40px); }
  .site-header { padding-block: 20px 12px; flex-wrap: wrap; gap: 8px; }
  .brand { font-size: 18px; }
  .site-header nav { width: 100%; justify-content: space-between; gap: 10px; overflow-x: auto; }
  .site-header nav a { font-size: 12px; }
  .home-hero { min-height: auto; padding-block: 70px 55px; }
  h1 { font-size: clamp(48px, 15vw, 72px); }
  .hero-bottom { margin-top: 80px; grid-template-columns: 1fr; gap: 35px; }
  .actions { justify-content: flex-start; }
  .section-intro, .section-intro.compact { grid-template-columns: 1fr; gap: 20px; margin-bottom: 45px; }
  .section-intro > p:last-child { grid-column: 1; }
  .core-grid { grid-template-columns: 1fr; gap: 38px; }
  .core-grid article { min-height: 210px; }
  .evidence-list > a { grid-template-columns: 1fr auto; gap: 12px 20px; padding-block: 25px; }
  .evidence-list > a > span:nth-child(2) { grid-column: 1; grid-row: 2; }
  .evidence-list b { grid-column: 2; grid-row: 1 / span 2; }
  .principle { grid-template-columns: 1fr; gap: 27px; }
  .principle > p:nth-of-type(2), .principle .section-link { grid-column: 1; }
  .home-contact { grid-template-columns: 1fr; }
  .page-hero { min-height: 500px; padding-block: 70px 55px; grid-template-columns: 1fr; }
  .page-hero .eyebrow { padding-top: 0; }
  .page-hero .lede { grid-column: 1; }
  .architecture-flow > li { grid-template-columns: 1fr; gap: 24px; padding-block: 38px; }
  .arch-meta { flex-direction: row; justify-content: space-between; }
  .relationship-note { margin-left: 0; padding: 28px 0 55px 20px; grid-template-columns: 1fr; }
  .system-rows article { padding-block: 28px; grid-template-columns: 1fr auto; gap: 22px; }
  .system-rows article > p { grid-column: 1 / -1; grid-row: 2; }
  .system-rows article > a { grid-column: 2; grid-row: 1; }
  .evidence-boundary { grid-template-columns: 1fr; }
  .principles, .validation-flow, .stack { grid-template-columns: 1fr; }
  .principles article { min-height: 220px; }
  .artifact-list > a { padding-block: 25px; }
  .contact-page { min-height: auto; }
  .contact-details a { grid-template-columns: 70px 1fr auto; }
  .site-footer { flex-wrap: wrap; padding-block: 20px; }
  .site-footer p:nth-child(2) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}