/* Systems page. Tokens match the live SPA shell in assets/index-*.css. */

@font-face { font-family: "Instrument Sans"; font-style: normal; font-display: swap; font-weight: 400; src: url(/assets/instrument-sans-latin-400-normal-DRC__1Mx.woff2) format("woff2"), url(/assets/instrument-sans-latin-400-normal-D1W7dsQl.woff) format("woff"); }
@font-face { font-family: "Instrument Sans"; font-style: normal; font-display: swap; font-weight: 500; src: url(/assets/instrument-sans-latin-500-normal-Dk9ku72i.woff2) format("woff2"), url(/assets/instrument-sans-latin-500-normal-Z6ESRlEs.woff) format("woff"); }
@font-face { font-family: "Instrument Sans"; font-style: normal; font-display: swap; font-weight: 600; src: url(/assets/instrument-sans-latin-600-normal-B7fBEWYG.woff2) format("woff2"), url(/assets/instrument-sans-latin-600-normal-B9e8oLYv.woff) format("woff"); }
@font-face { font-family: "Instrument Sans"; font-style: normal; font-display: swap; font-weight: 700; src: url(/assets/instrument-sans-latin-700-normal-CYfAanHo.woff2) format("woff2"), url(/assets/instrument-sans-latin-700-normal-DfAjL1vF.woff) format("woff"); }
@font-face { font-family: "Space Mono"; font-style: normal; font-display: swap; font-weight: 400; src: url(/assets/space-mono-latin-400-normal-Rg4St2Dn.woff2) format("woff2"), url(/assets/space-mono-latin-400-normal-_3DlpgIW.woff) format("woff"); }
@font-face { font-family: "Space Mono"; font-style: normal; font-display: swap; font-weight: 700; src: url(/assets/space-mono-latin-700-normal-mWgeinG7.woff2) format("woff2"), url(/assets/space-mono-latin-700-normal-D7A851RN.woff) format("woff"); }

:root {
  --phosphor-500: oklch(.88 .26 153);
  --phosphor-700: oklch(.65 .21 153);
  --ink-950: oklch(.13 .015 155);
  --ink-900: oklch(.17 .017 155);
  --ink-800: oklch(.23 .018 155);
  --paper-100: oklch(.94 .015 145);
  --paper-200: oklch(.88 .018 145);
  --paper-500: oklch(.58 .02 145);
  --signal: var(--phosphor-500);
  --paper: var(--paper-100);
  --line-dark: oklch(.31 .025 155);
  --muted-dark: oklch(.7 .02 155);
  --muted-light: oklch(.4 .02 145);
  --font-sans: "Instrument Sans", sans-serif;
  --font-mono: "Space Mono", monospace;
  --page-x: clamp(20px, 4.5vw, 76px);
  --section-y: clamp(72px, 9vw, 120px);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100dvh;
  background: var(--ink-950);
  color: var(--paper-100);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--signal); }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; }
[hidden] { display: none !important; }
h1, h2, h3 { font-weight: 600; letter-spacing: -0.045em; line-height: 1.02; }
p { margin: 0; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  transform: translateY(-150%);
  background: var(--signal);
  color: var(--ink-950);
  padding: 10px 16px;
  font-weight: 700;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  min-height: 74px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 var(--page-x);
  border-bottom: 1px solid var(--line-dark);
  background: color-mix(in oklch, var(--ink-950) 94%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  width: max-content;
  min-height: 44px;
  color: var(--signal);
  text-decoration: none;
}
.brand-mark { width: 32px; height: 32px; flex: none; }
.brand > span {
  display: flex;
  flex-direction: column;
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.08em;
}
.brand small {
  margin-top: 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--muted-dark);
}
.desktop-nav { display: flex; align-items: center; gap: clamp(16px, 1.6vw, 28px); }
.desktop-nav a {
  position: relative;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted-dark);
  text-decoration: none;
}
.desktop-nav a:hover,
.desktop-nav a[aria-current="page"] { color: var(--signal); }
.desktop-nav a:after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 8px;
  height: 1px;
  background: var(--signal);
  transition: right 0.2s ease;
}
.desktop-nav a:hover:after,
.desktop-nav a[aria-current="page"]:after { right: 0; }
.header-cta {
  justify-self: end;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-bottom: 1px solid var(--signal);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--signal);
  text-decoration: none;
}
.header-cta:hover { color: var(--paper-100); border-color: var(--paper-100); }
.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  justify-self: end;
  border: 1px solid var(--phosphor-700);
  background: transparent;
  color: var(--paper-100);
  cursor: pointer;
}
.menu-toggle svg { width: 22px; height: 22px; }
.mobile-nav { display: none; }

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 18px;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
}
.button-primary { background: var(--signal); color: var(--ink-950); }
.button-primary:hover { background: var(--paper-100); color: var(--ink-950); }
.button-outline { border-color: var(--phosphor-700); background: transparent; color: var(--signal); }
.button-outline:hover { border-color: var(--signal); color: var(--paper-100); }

.mono-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.45;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--phosphor-700);
}
.section-pad { padding: var(--section-y) var(--page-x); }
.section-heading { max-width: 820px; margin-bottom: clamp(28px, 4vw, 48px); }
.section-heading h2 { margin: 12px 0 0; font-size: clamp(2.2rem, 4.6vw, 4.4rem); }
.lede { max-width: 42rem; color: var(--paper-200); font-size: 1.125rem; }

.letter {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: center;
  padding: clamp(56px, 8vw, 104px) var(--page-x);
  border-bottom: 1px solid var(--line-dark);
  overflow: hidden;
}
.letter-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(oklch(0.88 0.26 153 / 0.28) 1px, transparent 1px),
    linear-gradient(90deg, oklch(0.88 0.26 153 / 0.28) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(90deg, transparent, #000 28%, #000 72%, transparent);
  pointer-events: none;
}
.letter-copy, .thesis-board { position: relative; z-index: 1; }
.letter h1 {
  max-width: 14ch;
  margin: 16px 0 20px;
  font-size: clamp(2.7rem, 6vw, 5.6rem);
}
.byline {
  margin: 0 0 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
}
.letter-copy p + p { margin-top: 16px; }
.terminal-note {
  margin-top: 28px;
  padding: 18px 20px;
  border: 1px solid var(--phosphor-700);
  background: var(--ink-950);
  color: var(--signal);
  font-size: 1.05rem;
}

.thesis-board {
  display: grid;
  gap: 0;
  border: 1px solid var(--phosphor-700);
  background: color-mix(in oklch, var(--ink-950) 88%, transparent);
}
.thesis-node {
  min-height: 148px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 8px;
  padding: 22px;
}
.thesis-node strong { font-size: clamp(2rem, 3vw, 3rem); letter-spacing: -0.04em; line-height: 1; }
.thesis-node.node-outline { border-bottom: 1px solid var(--phosphor-700); }
.thesis-node.node-fill { background: var(--signal); color: var(--ink-950); }
.thesis-node.node-fill .mono-label { color: var(--ink-800); }
.thesis-caption {
  margin: 0;
  padding: 14px 22px 18px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--phosphor-700);
}

.scene {
  position: relative;
  height: 520px;
  margin-bottom: 12px;
  border: 1px solid var(--phosphor-700);
  overflow: hidden;
  background: var(--ink-950);
}
.scene-grid {
  position: absolute;
  inset: -30% 0 0;
  background-image:
    linear-gradient(oklch(0.88 0.26 153 / 0.45) 1px, transparent 1px),
    linear-gradient(90deg, oklch(0.88 0.26 153 / 0.45) 1px, transparent 1px);
  background-size: 42px 42px;
  transform: rotateX(58deg) scale(1.45);
  transform-origin: center 30%;
}
.scene-network { position: relative; height: 100%; }
.scene-core {
  position: absolute;
  left: 50%;
  top: 46%;
  width: 168px;
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: translate(-50%, -50%);
  border: 1px solid var(--phosphor-700);
  border-radius: 50%;
  background: var(--ink-950);
}
.scene-core span { font-family: var(--font-mono); font-size: 15px; color: var(--signal); letter-spacing: 0.14em; }
.scene-core small { margin-top: 6px; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; color: var(--phosphor-700); }
.scene-node {
  position: absolute;
  z-index: 2;
  width: 108px;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--phosphor-700);
  background: var(--ink-950);
  transform: rotate(45deg);
}
.scene-node span {
  transform: rotate(-45deg);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--signal);
  text-align: center;
  width: 9ch;
}
.scene-node.node-0 { left: 12%; top: 18%; background: var(--signal); }
.scene-node.node-0 span { color: var(--ink-950); }
.scene-node.node-1 { right: 12%; top: 16%; }
.scene-node.node-2 { left: 16%; bottom: 12%; }
.scene-node.node-3 { right: 14%; bottom: 14%; }
.scene-link {
  position: absolute;
  z-index: 1;
  left: 28%;
  top: 48%;
  width: 44%;
  height: 1px;
  background: var(--phosphor-700);
}
.scene-link.link-0 { transform: rotate(24deg); }
.scene-link.link-1 { transform: rotate(-22deg); }
.scene-link.link-2 { transform: rotate(160deg); }

.layer-list { display: grid; gap: 0; border-top: 1px solid var(--line-dark); }
.layer {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 28px;
  padding: 32px 0;
  border-bottom: 1px solid var(--line-dark);
}
.layer h3 { margin: 8px 0 12px; font-size: clamp(1.6rem, 2.4vw, 2.3rem); }
.layer p { max-width: 46rem; color: var(--paper-200); }
.layer-proof {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
}
.node-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.node-row li {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid var(--phosphor-700);
  background: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--signal);
  list-style: none;
}
.node-row { margin-left: 0; padding: 0; }

.name-grid, .phase-row { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.name-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.name-grid li, .phase-row li {
  min-height: 112px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--phosphor-700);
  background:
    linear-gradient(oklch(0.88 0.26 153 / 0.16) 1px, transparent 1px),
    linear-gradient(90deg, oklch(0.88 0.26 153 / 0.16) 1px, transparent 1px),
    var(--ink-950);
  background-size: 22px 22px, 22px 22px, auto;
}
.name-grid strong, .phase-row strong { font-size: 1.2rem; letter-spacing: -0.03em; line-height: 1.2; }
.phase-row { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.phase-row li { min-height: 140px; background-color: var(--ink-900); }
.phase-row span {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
}

.split-note {
  max-width: 46rem;
  margin-top: 22px;
  color: var(--paper-200);
}

.governance {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(28px, 5vw, 72px);
  background: var(--signal);
  color: var(--ink-950);
}
.governance .mono-label { color: var(--ink-800); }
.governance h2 { margin: 12px 0; font-size: clamp(2.2rem, 4.4vw, 4.2rem); }
.governance p { max-width: 36rem; font-size: 1.125rem; }
.governance ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--ink-950); }
.governance li {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 12px;
  align-items: center;
  min-height: 64px;
  padding: 12px 0;
  border-bottom: 1px solid color-mix(in oklch, var(--ink-950) 35%, transparent);
  font-size: 1.125rem;
}
.governance li span { font-family: var(--font-mono); font-size: 13px; }

.systems-cta {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  background: var(--paper);
  color: var(--ink-950);
}
.systems-cta h2 { margin: 12px 0; font-size: clamp(2.2rem, 4.4vw, 4.2rem); max-width: 16ch; }
.systems-cta p { max-width: 36rem; color: var(--muted-light); }
.cta-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.systems-cta .button-outline { border-color: var(--ink-950); color: var(--ink-950); }
.systems-cta .button-outline:hover { background: var(--ink-950); color: var(--paper-100); }

.site-footer {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  padding: 42px var(--page-x) calc(28px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line-dark);
}
.footer-directory, .footer-social { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.footer-directory { justify-content: center; }
.footer-social { justify-content: flex-end; }
.footer-directory a, .footer-social a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted-dark);
  text-decoration: none;
}
.footer-directory a:hover, .footer-social a:hover { color: var(--signal); }
.site-footer > small {
  grid-column: 1 / -1;
  padding-top: 18px;
  border-top: 1px solid var(--line-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted-dark);
}
.site-footer > small a { color: var(--signal); }

@media (max-width: 1100px) {
  .name-grid { grid-template-columns: 1fr 1fr; }
  .governance { gap: 36px; }
}

@media (max-width: 900px) {
  .site-header { grid-template-columns: 1fr auto; }
  .desktop-nav, .header-cta { display: none; }
  .menu-toggle { display: flex; }
  .mobile-nav.is-open {
    position: absolute;
    top: 74px;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    padding: 8px var(--page-x) 22px;
    border-bottom: 1px solid var(--line-dark);
    background: var(--ink-950);
  }
  .mobile-nav.is-open a {
    min-height: 48px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--line-dark);
    font-size: 1.15rem;
    text-decoration: none;
  }
  .mobile-nav.is-open a:last-child {
    margin-top: 12px;
    justify-content: center;
    border: 0;
    background: var(--signal);
    color: var(--ink-950);
    font-family: var(--font-mono);
    font-size: 13px;
  }
  .scene { height: 380px; }
  .letter, .layer, .governance, .site-footer { grid-template-columns: 1fr; }
  .systems-cta { flex-direction: column; align-items: stretch; }
  .cta-actions { width: 100%; }
  .phase-row { grid-template-columns: 1fr 1fr; }
  .footer-directory, .footer-social { justify-content: flex-start; }
  .systems-cta { align-items: flex-start; }
}

@media (max-width: 640px) {
  .letter { padding-top: 40px; }
  .letter h1 { font-size: clamp(2.4rem, 12vw, 3.4rem); }
  .name-grid, .phase-row { grid-template-columns: 1fr; }
  .cta-actions { flex-direction: column; }
  .cta-actions .button { width: 100%; }
  .layer { grid-template-columns: 1fr; gap: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Walkthrough, boundary examples, related links. Uses the same tokens as above. */
.walk-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 24px;
  border: 1px solid var(--phosphor-700);
  background: var(--phosphor-700);
}
.walk-step {
  min-height: 56px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 4px;
  padding: 10px 14px;
  border: 0;
  background: var(--ink-950);
  color: var(--paper-200);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
}
.walk-step span { font-family: var(--font-mono); font-size: 12px; font-weight: 400; color: var(--phosphor-700); }
.walk-step:hover { color: var(--paper-100); }
.walk-step[aria-current="step"] { background: var(--signal); color: var(--ink-950); }
.walk-step[aria-current="step"] span { color: var(--ink-800); }

.walk-list {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--phosphor-700);
}
.walk-panel {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 28px;
  padding: 28px;
}
.walk-panel h3 { margin: 8px 0 12px; font-size: clamp(1.5rem, 2.4vw, 2.1rem); }
.walk-panel p { max-width: 46rem; color: var(--paper-200); }
.walk-output {
  display: block;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
}

.phase-purpose { margin: 0; font-size: 1rem; line-height: 1.35; color: var(--paper-200); }
.phase-row li { min-height: 168px; }

.governance li div { display: grid; gap: 6px; }
.governance li strong { font-weight: 600; letter-spacing: -0.02em; }
.boundary-example { font-size: 1rem; line-height: 1.5; color: var(--ink-950); max-width: 34rem; }

.related-row {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.related-row li { display: flex; }
.related-row a {
  width: 100%;
  min-height: 148px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  border: 1px solid var(--phosphor-700);
  background: var(--ink-900);
  color: var(--paper-100);
  text-decoration: none;
}
.related-row a:hover { border-color: var(--signal); color: var(--paper-100); }
.related-row strong { font-size: 1.15rem; letter-spacing: -0.03em; line-height: 1.2; color: var(--signal); }
.related-row span { font-size: 1rem; line-height: 1.45; color: var(--paper-200); }

@media (max-width: 1100px) {
  .related-row { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .related-row { grid-template-columns: 1fr 1fr; }
  .walk-panel { grid-template-columns: 96px minmax(0, 1fr); gap: 20px; }
}

@media (max-width: 640px) {
  .walk-steps { grid-template-columns: 1fr 1fr; }
  .walk-step { min-height: 52px; }
  .walk-panel { grid-template-columns: 1fr; gap: 10px; padding: 22px; }
  .phase-row li { min-height: 0; }
  .related-row { grid-template-columns: 1fr; }
  .related-row a { min-height: 0; }
}