:root {
  --ink: #10110f;
  --signal: #f6f8e8;
  --line: 2px;
  --pad: clamp(1.25rem, 4vw, 4.5rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--signal);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
}
a { color: inherit; }
button { font: inherit; }
.skip-link { position: fixed; left: 1rem; top: -4rem; z-index: 100; background: var(--signal); color: var(--ink); padding: .7rem 1rem; border: var(--line) solid var(--ink); }
.skip-link:focus { top: 1rem; }

.site-header {
  min-height: 76px;
  padding: 0 var(--pad);
  background: var(--ink);
  color: var(--signal);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border-bottom: var(--line) solid var(--signal);
  position: sticky;
  top: 0;
  z-index: 20;
}
.wordmark { display: inline-flex; width: max-content; align-items: center; gap: .8rem; font-weight: 800; text-decoration: none; letter-spacing: -.03em; }
.mark { width: 1.2rem; height: 1.2rem; border: var(--line) solid currentColor; border-radius: 50%; position: relative; }
.mark::after { content: ""; position: absolute; inset: 4px; background: currentColor; transform: rotate(45deg); }
nav { display: flex; gap: 2.2rem; font-size: .82rem; text-transform: uppercase; letter-spacing: .08em; }
nav a { text-decoration: none; border-bottom: 1px solid transparent; }
nav a:hover, nav a:focus-visible { border-color: currentColor; }
.status { justify-self: end; font: .72rem/1.2 ui-monospace, monospace; letter-spacing: .06em; }
.status i { display: inline-block; width: .55rem; height: .55rem; background: currentColor; border-radius: 50%; margin-right: .45rem; animation: pulse 1.8s infinite; }

.hero { min-height: calc(100svh - 76px); display: grid; grid-template-columns: 1.05fr .95fr; position: relative; overflow: hidden; border-bottom: var(--line) solid var(--ink); }
.hero-copy { padding: clamp(4rem, 9vw, 8rem) var(--pad) 7rem; border-right: var(--line) solid var(--ink); display: flex; flex-direction: column; align-items: flex-start; justify-content: center; }
.eyebrow, .section-no, .panel-tag { margin: 0 0 2rem; font: .75rem/1.2 ui-monospace, monospace; letter-spacing: .12em; text-transform: uppercase; }
h1, h2, h3, p { text-wrap: balance; }
h1 { margin: 0; font-size: clamp(4rem, 10vw, 9.5rem); line-height: .82; letter-spacing: -.085em; text-transform: uppercase; }
h1 em { font-style: normal; color: var(--signal); -webkit-text-stroke: 2px var(--ink); paint-order: stroke fill; text-shadow: 7px 7px 0 var(--ink); }
.lead { max-width: 37rem; margin: 3rem 0 2.4rem; font-size: clamp(1.05rem, 1.6vw, 1.35rem); line-height: 1.5; }
.text-link { display: inline-flex; align-items: center; gap: 2rem; padding: .85rem 0; font-weight: 700; text-decoration: none; border-bottom: var(--line) solid currentColor; }
.text-link span { font-size: 1.4rem; transition: transform .2s; }
.text-link:hover span { transform: translate(.25rem, .25rem); }

.system-visual { position: relative; min-height: 620px; display: grid; place-items: center; background-image: linear-gradient(to right, transparent calc(50% - 1px), var(--ink) 50%, transparent calc(50% + 1px)), linear-gradient(to bottom, transparent calc(50% - 1px), var(--ink) 50%, transparent calc(50% + 1px)); }
.core { width: clamp(13rem, 24vw, 21rem); aspect-ratio: 1; border: var(--line) solid var(--ink); border-radius: 50%; background: var(--ink); color: var(--signal); display: flex; flex-direction: column; align-items: center; justify-content: center; position: relative; z-index: 4; box-shadow: 0 0 0 12px var(--signal), 0 0 0 14px var(--ink); }
.core-label { font: .67rem ui-monospace, monospace; letter-spacing: .15em; margin-bottom: .5rem; }
.core strong { font-size: clamp(2rem, 4vw, 4rem); line-height: 1; letter-spacing: -.06em; }
.core small { position: absolute; bottom: 2.5rem; font: .68rem ui-monospace, monospace; }
.orbit { position: absolute; border: var(--line) solid var(--ink); border-radius: 50%; animation: rotate 18s linear infinite; }
.orbit::after { content: ""; position: absolute; width: 1.1rem; height: 1.1rem; background: var(--ink); border-radius: 50%; top: 8%; left: 18%; }
.orbit-a { width: 62%; aspect-ratio: 1; }
.orbit-b { width: 88%; aspect-ratio: 1; animation-direction: reverse; animation-duration: 30s; }
.orbit-b::after { border-radius: 0; top: 68%; left: 91%; transform: rotate(20deg); }
.cross { position: absolute; width: 1.5rem; height: 1.5rem; }
.cross::before, .cross::after { content: ""; position: absolute; background: var(--ink); }
.cross::before { width: 100%; height: 2px; top: calc(50% - 1px); }
.cross::after { height: 100%; width: 2px; left: calc(50% - 1px); }
.cross-a { top: 12%; right: 11%; }
.cross-b { bottom: 14%; left: 12%; transform: rotate(45deg); }
.cycle-toggle { position: absolute; right: 1.2rem; bottom: 1.2rem; border: var(--line) solid var(--ink); background: transparent; color: var(--ink); padding: .65rem .85rem; font: .7rem ui-monospace, monospace; text-transform: uppercase; cursor: pointer; }
.cycle-toggle:hover, .cycle-toggle:focus-visible { background: var(--ink); color: var(--signal); }
.hero-index { position: absolute; bottom: 0; left: 0; width: 50%; display: flex; justify-content: space-between; gap: 1rem; padding: 1rem var(--pad); border-top: var(--line) solid var(--ink); font: .67rem ui-monospace, monospace; letter-spacing: .08em; }

.statement { padding: clamp(5rem, 10vw, 10rem) var(--pad); background: var(--ink); color: var(--signal); display: grid; grid-template-columns: .3fr 1fr; gap: 3rem; }
.statement h2 { margin: 0; font-size: clamp(2.4rem, 6vw, 6.4rem); line-height: .98; letter-spacing: -.06em; max-width: 16ch; }
.statement h2 span { color: var(--ink); -webkit-text-stroke: 1.5px var(--signal); }

.research, .applications, .architecture, .principles { padding: clamp(5rem, 9vw, 9rem) var(--pad); border-bottom: var(--line) solid var(--ink); }
.section-heading { display: grid; grid-template-columns: .35fr 1fr .65fr; gap: 2rem; align-items: end; margin-bottom: 5rem; }
.section-heading h2, .applications h2, .principles h2, .closing h2 { margin: 0; font-size: clamp(2.7rem, 5.8vw, 6rem); line-height: .92; letter-spacing: -.065em; }
.section-heading > p:last-child { max-width: 28rem; margin: 0; font-size: 1.05rem; }
.stack { display: grid; grid-template-columns: repeat(3, 1fr); border: var(--line) solid var(--ink); }
.stack-card { min-height: 31rem; padding: 1.6rem; display: flex; flex-direction: column; position: relative; overflow: hidden; }
.stack-card + .stack-card { border-left: var(--line) solid var(--ink); }
.stack-card.inverse { background: var(--ink); color: var(--signal); }
.card-top { display: flex; justify-content: space-between; font: .7rem ui-monospace, monospace; letter-spacing: .08em; }
.stack-card h3 { margin: auto 0 1.8rem; font-size: clamp(2rem, 3.5vw, 4rem); line-height: .92; letter-spacing: -.055em; }
.stack-card p { max-width: 28rem; margin: 0; }
.mini-geometry { position: absolute; width: 10rem; height: 10rem; top: 3.5rem; right: -1.5rem; opacity: .9; }
.mini-geometry i { position: absolute; display: block; border: 1.5px solid currentColor; }
.geo-control i:nth-child(1) { inset: 0; border-radius: 50%; }
.geo-control i:nth-child(2) { inset: 22%; transform: rotate(45deg); }
.geo-control i:nth-child(3) { width: 140%; top: 50%; left: -20%; border-width: 1.5px 0 0; }
.geo-evidence i:nth-child(1), .geo-evidence i:nth-child(2) { width: 65%; aspect-ratio: 1; border-radius: 50%; top: 18%; }
.geo-evidence i:nth-child(2) { left: 35%; }
.geo-evidence i:nth-child(3) { width: 3rem; aspect-ratio: 1; background: currentColor; border: 0; top: 36%; left: 35%; transform: rotate(45deg); }
.geo-modal i:nth-child(1) { width: 100%; top: 20%; transform: rotate(18deg); }
.geo-modal i:nth-child(2) { width: 100%; top: 48%; transform: rotate(-18deg); }
.geo-modal i:nth-child(3) { width: 3.5rem; aspect-ratio: 1; border-radius: 50%; top: 30%; left: 38%; background: var(--signal); }
.loop-strip { border: var(--line) solid var(--ink); border-top: 0; min-height: 4rem; display: flex; align-items: center; justify-content: space-around; gap: 1rem; padding: 1rem; font: .72rem ui-monospace, monospace; letter-spacing: .1em; overflow: hidden; }
.loop-strip b { font-size: 1.3rem; }

.applications { background: var(--ink); color: var(--signal); }
.applications-head { display: grid; grid-template-columns: 1fr .45fr; gap: 3rem; align-items: end; margin-bottom: 5rem; }
.applications-head > p { max-width: 28rem; margin: 0; }
.app-shell { display: grid; grid-template-columns: .37fr 1fr; border: var(--line) solid var(--signal); }
.app-tabs { display: flex; flex-direction: column; border-right: var(--line) solid var(--signal); }
.app-tabs button { min-height: 5.5rem; display: flex; justify-content: space-between; align-items: center; text-align: left; border: 0; border-bottom: 1px solid var(--signal); padding: 1rem 1.3rem; color: var(--signal); background: var(--ink); cursor: pointer; }
.app-tabs button:last-child { border-bottom: 0; }
.app-tabs button[aria-selected="true"] { color: var(--ink); background: var(--signal); }
.app-tabs button span { font: .7rem ui-monospace, monospace; }
.app-panel { min-height: 34rem; display: grid; grid-template-columns: 1fr .7fr; gap: 4rem; padding: clamp(2rem, 5vw, 5rem); position: relative; overflow: hidden; }
.panel-copy, .signal-grid { position: relative; z-index: 2; }
.panel-copy h3 { margin: 0 0 2rem; font-size: clamp(2.6rem, 5.6vw, 6rem); line-height: .9; letter-spacing: -.065em; }
.panel-copy > p:last-child { max-width: 42rem; font-size: 1.05rem; }
.signal-grid { margin: 0; align-self: center; }
.signal-grid div { padding: 1.1rem 0; border-top: 1px solid var(--signal); }
.signal-grid dt { font: .67rem ui-monospace, monospace; letter-spacing: .1em; text-transform: uppercase; opacity: .68; margin-bottom: .3rem; }
.signal-grid dd { margin: 0; }
.panel-glyph { position: absolute; right: -7rem; bottom: -9rem; width: 24rem; aspect-ratio: 1; border: 1px solid var(--signal); border-radius: 50%; opacity: .25; animation: rotate 25s linear infinite; }
.panel-glyph span { position: absolute; inset: 20%; border: 1px solid var(--signal); }
.panel-glyph span:nth-child(2) { transform: rotate(45deg); }
.panel-glyph span:nth-child(3) { inset: 40%; border-radius: 50%; background: var(--signal); }
.panel-glyph span:nth-child(4) { inset: -20% 49%; }

.architecture { padding-bottom: 0; }
.section-heading.compact { grid-template-columns: .35fr 1fr; }
.architecture-flow { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(6, 1fr); border: var(--line) solid var(--ink); border-bottom: 0; }
.architecture-flow li { min-height: 16rem; padding: 1.2rem; border-right: 1px solid var(--ink); display: flex; flex-direction: column; position: relative; }
.architecture-flow li:last-child { border: 0; }
.architecture-flow li::after { content: "→"; position: absolute; right: -.7rem; top: 50%; z-index: 2; width: 1.4rem; height: 1.4rem; background: var(--signal); display: grid; place-items: center; }
.architecture-flow li:last-child::after { content: "↺"; right: 1rem; top: 1rem; }
.architecture-flow span { font: .7rem ui-monospace, monospace; }
.architecture-flow strong { margin: auto 0 .5rem; font-size: 1.25rem; }
.architecture-flow small { font: .72rem ui-monospace, monospace; }

.principles { display: grid; grid-template-columns: .8fr 1fr; gap: clamp(3rem, 8vw, 8rem); }
.principles-title { position: sticky; top: 8rem; align-self: start; }
.principle-list article { display: grid; grid-template-columns: 3rem 1fr; padding: 1.8rem 0; border-top: var(--line) solid var(--ink); }
.principle-list span { font: .7rem ui-monospace, monospace; }
.principle-list h3 { margin: 0; font-size: clamp(1.5rem, 3vw, 2.8rem); letter-spacing: -.045em; }
.principle-list p { grid-column: 2; max-width: 35rem; }

.closing { min-height: 80vh; background: var(--signal); display: flex; flex-direction: column; justify-content: center; padding: clamp(5rem, 10vw, 10rem) var(--pad); position: relative; overflow: hidden; }
.closing h2 { position: relative; z-index: 2; max-width: 15ch; }
.closing h2 span { color: var(--signal); -webkit-text-stroke: 1.8px var(--ink); }
.closing .text-link { margin-top: 3rem; align-self: flex-start; position: relative; z-index: 2; }
.closing-shape { position: absolute; right: -8vw; width: 48vw; aspect-ratio: 1; border: var(--line) solid var(--ink); border-radius: 50%; }
.closing-shape::before, .closing-shape::after, .closing-shape i { content: ""; position: absolute; border: var(--line) solid var(--ink); }
.closing-shape::before { inset: 18%; transform: rotate(45deg); }
.closing-shape::after { inset: 35%; border-radius: 50%; background: var(--ink); }
.closing-shape i:first-child { width: 140%; left: -20%; top: 50%; border-width: var(--line) 0 0; }
.closing-shape i:last-child { height: 140%; top: -20%; left: 50%; border-width: 0 0 0 var(--line); }
footer { min-height: 6rem; background: var(--ink); color: var(--signal); padding: 1.5rem var(--pad); display: flex; justify-content: space-between; align-items: center; gap: 2rem; font: .69rem ui-monospace, monospace; letter-spacing: .08em; }

@keyframes rotate { to { transform: rotate(360deg); } }
@keyframes pulse { 50% { opacity: .25; } }

@media (max-width: 900px) {
  .site-header { grid-template-columns: 1fr auto; }
  nav { display: none; }
  .hero { grid-template-columns: 1fr; }
  .hero-copy { border-right: 0; border-bottom: var(--line) solid var(--ink); min-height: 70svh; }
  .system-visual { min-height: 80vw; }
  .hero-index { display: none; }
  .statement, .section-heading, .section-heading.compact, .applications-head, .principles { grid-template-columns: 1fr; }
  .statement { gap: 1rem; }
  .stack { grid-template-columns: 1fr; }
  .stack-card { min-height: 27rem; }
  .stack-card + .stack-card { border-left: 0; border-top: var(--line) solid var(--ink); }
  .app-shell { grid-template-columns: 1fr; }
  .app-tabs { display: grid; grid-template-columns: 1fr 1fr; border: 0; border-bottom: var(--line) solid var(--signal); }
  .app-tabs button:nth-child(odd) { border-right: 1px solid var(--signal); }
  .app-panel { grid-template-columns: 1fr; }
  .architecture-flow { grid-template-columns: repeat(2, 1fr); }
  .architecture-flow li { border-bottom: 1px solid var(--ink); min-height: 11rem; }
  .principles-title { position: static; }
}

@media (max-width: 560px) {
  .site-header { min-height: 66px; }
  .status { font-size: 0; }
  .status i { margin: 0; }
  h1 { font-size: clamp(3.6rem, 19vw, 6rem); }
  h1 em { text-shadow: 4px 4px 0 var(--ink); }
  .hero-copy { padding-top: 4rem; }
  .system-visual { min-height: 100vw; }
  .orbit-a { width: 72%; }
  .orbit-b { width: 98%; }
  .loop-strip { justify-content: flex-start; overflow-x: auto; }
  .app-tabs { grid-template-columns: 1fr; }
  .app-tabs button:nth-child(odd) { border-right: 0; }
  .app-panel { padding: 2rem 1.25rem 4rem; gap: 2rem; }
  .architecture-flow { grid-template-columns: 1fr; }
  .architecture-flow li { min-height: 9rem; }
  .architecture-flow li::after { content: "↓"; right: 1rem; top: auto; bottom: -.7rem; }
  footer { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}