/* ==========================================================================
   INVARIANT — invariant.black
   Visual system: near-black surfaces, off-white text, muted gray,
   one cold spectral accent. Hairlines. Square corners. Sparse.
   ========================================================================== */

@import url('../fonts/fonts.css');

:root {
  /* Surfaces */
  --bg-0: #050505;
  --bg-1: #090909;
  --bg-2: #0d0d0d;
  --bg-3: #111111;

  /* Text */
  --fg-0: #e7e5e0;
  --fg-1: #9b9994;
  --fg-2: #77766f;
  --fg-3: #4a4945;

  /* Lines */
  --line: rgba(255, 255, 255, 0.08);
  --line-2: rgba(255, 255, 255, 0.14);
  --line-3: rgba(255, 255, 255, 0.24);
  --grid: rgba(255, 255, 255, 0.028);

  /* Signal */
  --accent: #8fd0e3;
  --accent-70: rgba(143, 208, 227, 0.7);
  --accent-40: rgba(143, 208, 227, 0.4);
  --accent-16: rgba(143, 208, 227, 0.16);
  --accent-08: rgba(143, 208, 227, 0.08);

  /* Type */
  --font-sans: 'Geist', 'Inter', 'Helvetica Neue', Helvetica, Arial, system-ui, sans-serif;
  --font-mono: 'Geist Mono', 'SF Mono', 'Menlo', 'Consolas', 'Liberation Mono', monospace;

  --text-xs: 0.6875rem;   /* 11px — technical labels */
  --text-sm: 0.8125rem;   /* 13px */
  --text-base: 1rem;
  --text-lg: 1.1875rem;
  --text-xl: clamp(1.375rem, 1.1rem + 1vw, 1.75rem);

  --track-label: 0.09em;

  /* Layout */
  --container: 1440px;
  --gutter: clamp(1.25rem, 4vw, 4rem);
  --section-y: clamp(5rem, 11vw, 10.5rem);
  --radius: 2px;
  --nav-h: 3.5rem;

  /* Motion */
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
  --dur: 320ms;

  color-scheme: dark;
}

/* --------------------------------------------------------------------------
   Reset / base
   -------------------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 1rem);
}

body {
  margin: 0;
  background: var(--bg-0);
  color: var(--fg-0);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'ss01' 0, 'cv11' 1;
  overflow-x: hidden;
}

h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
img, svg, canvas { display: block; max-width: 100%; }
::selection { background: var(--accent-40); color: var(--fg-0); }

:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 3px;
}

.sr-only {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: fixed; top: 0.5rem; left: 0.5rem; z-index: 100;
  padding: 0.5rem 0.75rem;
  background: var(--fg-0); color: var(--bg-0);
  font: 500 var(--text-xs) / 1 var(--font-mono);
  letter-spacing: var(--track-label); text-transform: uppercase;
  transform: translateY(-200%);
}
.skip-link:focus { transform: none; }

/* --------------------------------------------------------------------------
   Typography utilities
   -------------------------------------------------------------------------- */

.mono {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  line-height: 1.4;
  font-variant-numeric: tabular-nums;
}

.label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--fg-2);
  font-variant-numeric: tabular-nums;
}

.h-display {
  font-size: clamp(2.5rem, 1.5rem + 5.6vw, 6.25rem);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.h-section {
  font-size: clamp(1.875rem, 1.2rem + 2.6vw, 3.5rem);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -0.028em;
  text-wrap: balance;
  max-width: 22ch;
}

.h-sub {
  font-size: var(--text-xl);
  font-weight: 500;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.lede {
  font-size: clamp(1.0625rem, 0.95rem + 0.5vw, 1.3125rem);
  line-height: 1.5;
  color: var(--fg-1);
  max-width: 44ch;
  text-wrap: pretty;
}

.prose {
  color: var(--fg-1);
  max-width: 56ch;
  text-wrap: pretty;
}
.prose p + p { margin-top: 1.1em; }
.prose strong { color: var(--fg-0); font-weight: 500; }

/* --------------------------------------------------------------------------
   Layout primitives
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.sec {
  position: relative;
  padding-block: var(--section-y);
  border-top: 1px solid var(--line);
}

.sec__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: clamp(2rem, 4vw, 3.5rem);
  color: var(--fg-2);
}
.sec__head .sec__eyebrow { color: var(--fg-1); }
.sec__ref { text-align: right; }

.sec__intro {
  display: grid;
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}
@media (min-width: 900px) {
  .sec__intro { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
  .sec__intro > .prose { padding-top: 0.5rem; }
}

/* Engineering grid background */
.grid-bg { position: relative; }
.grid-bg::before {
  content: '';
  position: absolute; inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: center top;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 100%);
          mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, #000 30%, transparent 100%);
}

/* Figure frame with coordinate corner marks */
.fig {
  position: relative;
  border: 1px solid var(--line);
  background: var(--bg-1);
}
.fig::before, .fig::after,
.fig > .fig__c::before, .fig > .fig__c::after {
  content: '';
  position: absolute;
  width: 9px; height: 9px;
  pointer-events: none;
  background:
    linear-gradient(var(--line-3), var(--line-3)) center / 9px 1px no-repeat,
    linear-gradient(var(--line-3), var(--line-3)) center / 1px 9px no-repeat;
}
.fig::before { top: -5px; left: -5px; }
.fig::after  { top: -5px; right: -5px; }
.fig > .fig__c::before { bottom: -5px; left: -5px; }
.fig > .fig__c::after  { bottom: -5px; right: -5px; }

.fig__bar {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding: 0.625rem 0.875rem;
  border-bottom: 1px solid var(--line);
  color: var(--fg-2);
  min-height: 2.25rem;
}
.fig__bar .mono { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Status dot */
.dot {
  display: inline-block;
  width: 5px; height: 5px;
  background: var(--fg-2);
  vertical-align: middle;
  margin-right: 0.5em;
  position: relative; top: -1px;
}
.dot--on { background: var(--accent); animation: dot-pulse 2.4s ease-in-out infinite; }
@keyframes dot-pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.6em;
  height: 2.75rem;
  padding: 0 1.25rem;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.005em;
  color: var(--fg-0);
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.btn:hover { border-color: var(--line-3); background: rgba(255,255,255,0.03); }
.btn--primary { background: var(--fg-0); color: var(--bg-0); border-color: var(--fg-0); }
.btn--primary:hover { background: #fff; border-color: #fff; }
.btn__arrow { font-family: var(--font-mono); font-size: 0.75rem; opacity: 0.7; }

/* Tag list (mono metadata) */
.tags { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; color: var(--fg-2); }
.tags li { position: relative; padding-left: 0.9rem; }
.tags li::before {
  content: ''; position: absolute; left: 0; top: 0.55em;
  width: 4px; height: 4px; background: var(--fg-3);
}

/* Reveal (subtle, no bounce) */
.reveal { opacity: 0; transform: translateY(10px); transition: opacity 700ms var(--ease), transform 700ms var(--ease); }
.reveal.in-view { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 90ms; }
.reveal[data-delay="2"] { transition-delay: 180ms; }
.reveal[data-delay="3"] { transition-delay: 270ms; }

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */

.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  height: var(--nav-h);
}
/* Blur lives on a pseudo-element: a backdrop-filter on .nav itself would
   become the containing block for the fixed mobile panel. */
.nav::before {
  content: '';
  position: absolute; inset: 0; z-index: -1;
  background: rgba(5, 5, 5, 0.72);
  -webkit-backdrop-filter: blur(10px) saturate(120%);
          backdrop-filter: blur(10px) saturate(120%);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}
.nav.is-scrolled::before { border-bottom-color: var(--line); }
.nav__inner { position: relative; }

.nav__inner {
  height: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: 2rem;
}

.nav__brand { display: flex; align-items: baseline; gap: 1rem; min-width: 0; }
.wordmark {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  color: var(--fg-0);
}
.nav__tag { color: var(--fg-2); font-size: 0.625rem; }

.nav__links { display: flex; gap: 2rem; }
.nav__links a {
  font-size: var(--text-sm);
  color: var(--fg-1);
  transition: color var(--dur) var(--ease);
}
.nav__links a:hover, .nav__links a[aria-current="true"] { color: var(--fg-0); }

.nav__cta { height: 2.125rem; padding: 0 0.875rem; font-size: 0.75rem; }

.nav__toggle {
  display: none;
  height: 2.125rem; padding: 0 0.625rem;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  color: var(--fg-1);
}

.nav__mobile {
  position: fixed; inset: var(--nav-h) 0 0 0;
  background: var(--bg-0);
  border-top: 1px solid var(--line);
  padding: 1.5rem var(--gutter) 2rem;
  display: flex; flex-direction: column; gap: 0;
}
.nav__mobile[hidden] { display: none; }
.nav__mobile a {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 1.125rem; font-weight: 500; letter-spacing: -0.01em;
  display: flex; justify-content: space-between; align-items: center;
}
.nav__mobile a .mono { color: var(--fg-3); }
.nav__mobile .btn { margin-top: 1.5rem; align-self: flex-start; }
.nav__mobile-foot { margin-top: auto; color: var(--fg-3); display: flex; justify-content: space-between; }

@media (max-width: 899px) {
  .nav__links, .nav__cta { display: none; }
  .nav__toggle { display: inline-flex; align-items: center; }
  .nav__tag { display: none; }
  body.nav-open { overflow: hidden; }
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  padding-top: calc(var(--nav-h) + clamp(3rem, 8vw, 7rem));
  padding-bottom: clamp(3rem, 6vw, 5rem);
  min-height: 100svh;
  display: flex; align-items: center;
}
.hero.grid-bg::before {
  -webkit-mask-image: radial-gradient(ellipse 70% 80% at 65% 45%, #000 20%, transparent 100%);
          mask-image: radial-gradient(ellipse 70% 80% at 65% 45%, #000 20%, transparent 100%);
}

.hero__grid {
  position: relative;
  display: grid;
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: center;
}
@media (min-width: 1000px) {
  .hero__grid { grid-template-columns: minmax(0, 11fr) minmax(0, 10fr); }
}

.hero__eyebrow {
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem;
  color: var(--fg-2);
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}
.hero__eyebrow span:first-child { color: var(--fg-1); }

.hero__title { margin-bottom: clamp(1.5rem, 3vw, 2.25rem); }
.hero__title .dim { color: var(--fg-1); }

.hero__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: clamp(1.75rem, 3vw, 2.5rem); }

.hero__meta {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem 1.5rem;
  color: var(--fg-2);
}
@media (min-width: 560px) { .hero__meta { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.hero__meta li { display: flex; flex-direction: column; gap: 0.35rem; }
.hero__meta li > .idx { color: var(--fg-3); font-size: 0.625rem; }

/* --------------------------------------------------------------------------
   Hero instrument (canvas + DOM chrome)
   -------------------------------------------------------------------------- */

.instrument {
  --band-a: 20%;
  --band-b: 25%;
  --band-c: 34%;
  --band-d: 21%;
  position: relative;
  aspect-ratio: 5 / 5.6;
  max-height: min(720px, calc(100svh - 11rem));
  width: 100%;
  overflow: hidden;
  user-select: none;
}
@media (max-width: 999px) { .instrument { aspect-ratio: 4 / 4.4; max-height: 640px; } }
@media (max-width: 560px)  { .instrument { aspect-ratio: 4 / 5.2; } }

.instrument__canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

.instrument__bar { position: relative; z-index: 2; background: var(--bg-1); }

.instrument__stage {
  position: absolute; left: 0; right: 0; z-index: 2;
  pointer-events: none;
  border-top: 1px solid var(--line);
}
.instrument__stage[data-stage="a"] { top: 2.25rem; height: calc((100% - 2.25rem - 2.1rem) * 0.20); border-top: 0; }
.instrument__stage[data-stage="b"] { top: calc(2.25rem + (100% - 2.25rem - 2.1rem) * 0.20); height: calc((100% - 2.25rem - 2.1rem) * 0.25); }
.instrument__stage[data-stage="c"] { top: calc(2.25rem + (100% - 2.25rem - 2.1rem) * 0.45); height: calc((100% - 2.25rem - 2.1rem) * 0.34); }
.instrument__stage[data-stage="d"] { top: calc(2.25rem + (100% - 2.25rem - 2.1rem) * 0.79); height: calc((100% - 2.25rem - 2.1rem) * 0.21); }

.instrument__stage-label {
  position: absolute; top: 0.5rem; left: 0.875rem;
  color: var(--fg-2);
  display: flex; gap: 0.75rem;
}
.instrument__stage-label .n { color: var(--fg-3); }
.instrument__stage-coord {
  position: absolute; top: 0.5rem; right: 0.875rem;
  color: var(--fg-3);
}

/* INVARIANT layer */
.instrument__stage[data-stage="c"] {
  border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
  background: linear-gradient(rgba(143,208,227,0.025), rgba(143,208,227,0.0));
}
.instrument__stage[data-stage="c"] .instrument__stage-label { color: var(--fg-0); }
.instrument__sub {
  position: absolute; left: 0; right: 0;
  display: grid; grid-template-rows: repeat(4, 1fr);
  top: 1.85rem; bottom: 0;
  pointer-events: auto;
}
.instrument__sub button {
  text-align: left;
  padding-left: 0.875rem;
  border-top: 1px solid var(--line);
  color: var(--fg-2);
  display: flex; align-items: center; justify-content: space-between;
  padding-right: 0.875rem;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.instrument__sub button .k { color: var(--fg-3); }
.instrument__sub button:hover, .instrument__sub button:focus-visible, .instrument__sub button.is-hot {
  color: var(--fg-0);
  background: rgba(143,208,227,0.035);
}
.instrument__sub button:hover .k, .instrument__sub button.is-hot .k { color: var(--accent); }
.instrument__sub button:focus-visible { outline-offset: -2px; }

.instrument__status {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  height: 2.1rem;
  border-top: 1px solid var(--line);
  background: var(--bg-1);
  display: flex; align-items: center;
  padding-inline: 0.875rem;
  gap: 1.25rem;
  color: var(--fg-2);
  overflow: hidden;
  white-space: nowrap;
}
.instrument__status span { display: inline-flex; align-items: center; }
.instrument__status .v { color: var(--fg-1); margin-left: 0.5em; font-variant-numeric: tabular-nums; }
.instrument__status .v.on { color: var(--accent); }
.instrument__status .flash { transition: color 120ms; }
.instrument__status .flash.is-flash { color: var(--fg-0); }
@media (max-width: 560px) {
  .instrument__status { gap: 0.9rem; font-size: 0.625rem; }
  .instrument__status .hide-sm { display: none; }
}

/* --------------------------------------------------------------------------
   01 — Problem
   -------------------------------------------------------------------------- */

.blocks {
  display: grid;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  margin-top: clamp(3rem, 6vw, 5rem);
}
@media (min-width: 760px) { .blocks { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.block {
  padding: 1.5rem 1.5rem 1.75rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 1.25rem;
  min-height: 15rem;
}
.block__head { display: flex; justify-content: space-between; color: var(--fg-2); }
.block__title { font-size: var(--text-sm); font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; }
.block__body { color: var(--fg-1); font-size: var(--text-sm); line-height: 1.6; margin-top: auto; max-width: 30ch; }

.problem-fig { margin-top: clamp(3rem, 6vw, 5rem); }
.problem-fig svg { width: 100%; height: auto; }
.problem-fig .fig__body { padding: 1.25rem 1rem 0.75rem; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 0.5rem 1.75rem; color: var(--fg-2); padding: 0.75rem 1rem 1rem; border-top: 1px solid var(--line); }
.chart-legend .sw { display: inline-block; width: 14px; height: 1px; background: var(--fg-1); vertical-align: middle; margin-right: 0.5em; position: relative; top: -1px; }
.chart-legend .sw--accent { background: var(--accent); }
.chart-legend .sw--dash { background: repeating-linear-gradient(90deg, var(--fg-2) 0 3px, transparent 3px 6px); }

/* --------------------------------------------------------------------------
   02 — Architecture
   -------------------------------------------------------------------------- */

.arch-layout {
  display: grid;
  gap: clamp(2rem, 4vw, 4rem);
  margin-top: clamp(2.5rem, 5vw, 4rem);
  align-items: start;
}
@media (min-width: 1000px) { .arch-layout { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); } }

.arch { position: relative; }
.arch__fig { padding: clamp(1.25rem, 3vw, 2.5rem) clamp(1rem, 4vw, 3rem); }
.arch__col {
  position: relative;
  display: flex; flex-direction: column; align-items: center;
  max-width: 34rem; margin-inline: auto;
  --gap: clamp(1.75rem, 3.2vw, 2.5rem);
}
.arch__svg { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }

.arch__node {
  position: relative; z-index: 1;
  width: 100%;
  max-width: 22rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.8rem 0.9rem;
  background: var(--bg-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  color: var(--fg-1);
  text-align: left;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.arch__node .idx { color: var(--fg-3); }
.arch__node .nm { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--track-label); text-transform: uppercase; flex: 1; }
.arch__node .st { width: 5px; height: 5px; background: var(--fg-3); flex-shrink: 0; transition: background-color var(--dur) var(--ease); }
.arch__node:hover, .arch__node:focus-visible, .arch__node.is-selected {
  border-color: var(--accent-70);
  color: var(--fg-0);
  background: var(--bg-3);
}
.arch__node:hover .st, .arch__node.is-selected .st { background: var(--accent); }
.arch__node.is-hot { border-color: var(--line-3); color: var(--fg-0); }
.arch__node + .arch__node, .arch__node + .arch__box, .arch__box + .arch__node { margin-top: var(--gap); }

.arch__box {
  position: relative; z-index: 1;
  width: 100%;
  padding: 2.75rem 1.25rem 1.25rem;
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  background: rgba(143,208,227,0.02);
  display: flex; flex-direction: column; align-items: center;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.arch__box.is-selected { border-color: var(--accent-40); }
.arch__box-label {
  position: absolute; top: 0.75rem; left: 0.9rem; right: 0.9rem;
  display: flex; justify-content: space-between; gap: 1rem;
  color: var(--fg-2);
}
.arch__box-label button {
  font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--fg-0);
  display: inline-flex; align-items: center; gap: 0.6em;
}
.arch__box-label button::before { content: ''; width: 5px; height: 5px; background: var(--accent); }
.arch__box .arch__node { --gap: clamp(1.4rem, 2.6vw, 2rem); }

.arch__edge-label {
  position: absolute;
  color: var(--fg-3);
  pointer-events: none;
  white-space: nowrap;
}

/* Annotation panel */
.arch__panel {
  position: sticky; top: calc(var(--nav-h) + 1.5rem);
  display: flex; flex-direction: column;
}
.arch__panel .fig__body { padding: 1.25rem 1rem 1.25rem; min-height: 18rem; }
.arch__panel-title { font-size: var(--text-lg); font-weight: 500; letter-spacing: -0.015em; margin-bottom: 0.75rem; display: flex; align-items: baseline; gap: 0.75rem; }
.arch__panel-title .mono { color: var(--fg-3); }
.arch__panel-desc { color: var(--fg-1); font-size: var(--text-sm); line-height: 1.65; max-width: 44ch; }
.arch__spec { margin-top: 1.25rem; border-top: 1px solid var(--line); }
.arch__spec div { display: grid; grid-template-columns: 7rem 1fr; gap: 1rem; padding: 0.6rem 0; border-bottom: 1px solid var(--line); color: var(--fg-1); font-size: var(--text-sm); }
.arch__spec dt { color: var(--fg-3); }
.arch__spec dd { margin: 0; }
.arch__hint { color: var(--fg-3); padding: 0.75rem 1rem; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 1rem; }
@media (max-width: 999px) { .arch__panel { position: static; } .arch__hint .desktop-only { display: none; } }

/* --------------------------------------------------------------------------
   Core systems
   -------------------------------------------------------------------------- */

.systems { border-top: 1px solid var(--line); margin-top: clamp(2.5rem, 5vw, 4rem); }
.sys {
  display: grid;
  gap: 1.5rem 2.5rem;
  padding: clamp(2rem, 4vw, 3.25rem) 0;
  border-bottom: 1px solid var(--line);
  align-items: start;
  transition: background-color var(--dur) var(--ease);
}
@media (min-width: 900px) {
  .sys { grid-template-columns: minmax(0, 3fr) minmax(0, 4fr) minmax(0, 5fr); }
}
.sys__id { display: flex; flex-direction: column; gap: 0.75rem; }
.sys__id .mono { color: var(--fg-3); }
.sys__name { font-size: clamp(1.75rem, 1.2rem + 2vw, 2.75rem); font-weight: 500; letter-spacing: -0.03em; line-height: 1; transition: color var(--dur) var(--ease); }
.sys__name .cursor { display: inline-block; width: 0.5em; height: 0.08em; background: var(--fg-3); vertical-align: 0.35em; margin-left: 0.2em; transition: background-color var(--dur) var(--ease); }
.sys.is-active .sys__name .cursor { background: var(--accent); }
.sys__statement { font-size: var(--text-lg); font-weight: 500; letter-spacing: -0.015em; line-height: 1.35; color: var(--fg-0); max-width: 30ch; }
.sys__tags { margin-top: 1.25rem; }
.sys__vis { position: relative; }
.sys__vis .fig__body { padding: 0.75rem; }
.sys__vis svg { width: 100%; height: auto; }
.sys__vis .fig { opacity: 0.72; transition: opacity 500ms var(--ease); }
.sys.is-active .sys__vis .fig { opacity: 1; }

/* SVG visual styling (shared) */
.v-cell { fill: rgba(255,255,255,0.06); transition: fill 240ms; }
.v-cell.on { fill: rgba(255,255,255,0.42); }
.v-cell.flag { fill: var(--accent); }
.v-node { fill: rgba(255,255,255,0.14); transition: fill 240ms; }
.v-node.on { fill: var(--accent); }
.v-edge { stroke: rgba(255,255,255,0.08); stroke-width: 1; }
.v-match { stroke: var(--accent); stroke-width: 1; opacity: 0; transition: opacity 240ms; }
.v-match.on { opacity: 1; }
.v-text { font-family: var(--font-mono); font-size: 9px; letter-spacing: 0.08em; fill: var(--fg-2); text-transform: uppercase; }
.v-text--dim { fill: var(--fg-3); }
.v-text--hi { fill: var(--accent); }
.v-line { stroke: rgba(255,255,255,0.12); stroke-width: 1; fill: none; }
.v-line--hi { stroke: var(--accent); }
.v-line--fg { stroke: var(--fg-1); }
.v-hair { stroke: rgba(255,255,255,0.07); stroke-width: 1; }
.v-hair--dash { stroke-dasharray: 2 4; }
.v-cursor { stroke: var(--fg-1); stroke-width: 1; }
.chart .v-text { font-size: 10.5px; }
.v-frame { font-family: var(--font-mono); font-size: 8px; fill: var(--accent); letter-spacing: 0.05em; }

/* Verify panel */
.bench { display: grid; grid-template-columns: 1fr auto auto; gap: 0 1rem; font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--track-label); text-transform: uppercase; }
.bench > div { padding: 0.55rem 0; border-bottom: 1px solid var(--line); color: var(--fg-2); display: flex; align-items: center; }
.bench > div:nth-child(3n+2) { color: var(--fg-1); justify-content: flex-end; }
.bench > div:nth-child(3n) { color: var(--fg-3); justify-content: flex-end; }
.bench > div.bench__spark { grid-column: 1 / -1; padding: 0.75rem 0 0.25rem; border-bottom: 0; display: block; }
.bench__spark svg { width: 100%; height: 44px; }
.bench > div.bench__foot { grid-column: 1 / -1; border-bottom: 0; color: var(--fg-3); padding-top: 0.75rem; justify-content: space-between; }

/* --------------------------------------------------------------------------
   Telemetry console
   -------------------------------------------------------------------------- */

.console-sec { padding-block: clamp(3rem, 6vw, 5rem); }
.console { background: var(--bg-1); }
.console__grid {
  display: grid;
  grid-template-columns: 1fr;
}
@media (min-width: 900px) { .console__grid { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); } }
.console__cell { padding: 1.125rem 1rem 1.25rem; min-width: 0; }
.console__cell + .console__cell { border-top: 1px solid var(--line); }
@media (min-width: 900px) { .console__cell + .console__cell { border-top: 0; border-left: 1px solid var(--line); } }
.console__cell-head { display: flex; justify-content: space-between; color: var(--fg-3); margin-bottom: 0.9rem; }

.metrics { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--track-label); text-transform: uppercase; }
.metrics div { display: flex; justify-content: space-between; gap: 1rem; padding: 0.55rem 0; border-bottom: 1px solid var(--line); }
.metrics dt { color: var(--fg-2); }
.metrics dd { margin: 0; color: var(--fg-1); font-variant-numeric: tabular-nums; }
.metrics dd.on { color: var(--accent); }
.metrics dd.dim { color: var(--fg-3); }

.stream {
  font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.04em;
  color: var(--fg-2);
  line-height: 1.75;
  height: calc(1.75em * 14);
  overflow: hidden;
  -webkit-mask-image: linear-gradient(#000 70%, transparent);
          mask-image: linear-gradient(#000 70%, transparent);
  white-space: pre;
}
.stream li { display: flex; gap: 1.5ch; }
.stream li .r { color: var(--fg-3); }
.stream li .h { color: var(--fg-1); }
.stream li .b { letter-spacing: 0.12em; }
.stream li .b .one { color: var(--fg-0); }
.stream li .s { color: var(--fg-3); }
.stream li .s.on { color: var(--accent); }
.stream li:first-child .h { color: var(--fg-0); }
@media (max-width: 560px) { .stream li .b { display: none; } }

.console__bottom {
  display: grid;
  border-top: 1px solid var(--line);
}
@media (min-width: 760px) { .console__bottom { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
.console__bottom .console__cell + .console__cell { border-top: 1px solid var(--line); border-left: 0; }
@media (min-width: 760px) { .console__bottom .console__cell + .console__cell { border-top: 0; border-left: 1px solid var(--line); } }

.trace svg { width: 100%; height: 88px; }
.trace__foot { display: flex; justify-content: space-between; color: var(--fg-3); margin-top: 0.5rem; }

.log { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.04em; color: var(--fg-2); line-height: 1.75; height: calc(1.75em * 6); overflow: hidden; white-space: pre; }
.log li { display: flex; gap: 1.5ch; }
.log li .t { color: var(--fg-3); }
.log li .c { color: var(--fg-1); min-width: 9ch; }
.log li .m.on { color: var(--accent); }

.state { display: grid; gap: 0.5rem; }
.state div { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--fg-2); padding: 0.45rem 0; border-bottom: 1px solid var(--line); }
.state dd { margin: 0; color: var(--fg-1); }
.state dd.on { color: var(--accent); }

.console__foot { padding: 0.7rem 1rem; border-top: 1px solid var(--line); color: var(--fg-3); display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

/* --------------------------------------------------------------------------
   03 — Abstraction
   -------------------------------------------------------------------------- */

.abstraction {
  margin-top: clamp(3rem, 6vw, 5rem);
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
@media (min-width: 900px) { .abstraction { grid-template-columns: minmax(0, 5fr) minmax(0, 2fr) minmax(0, 5fr); } }

.layer { padding: clamp(1.75rem, 3.5vw, 3rem) 0; display: flex; flex-direction: column; gap: 1.5rem; }
@media (min-width: 900px) { .layer--right { padding-left: clamp(1.5rem, 3vw, 3rem); } .layer--left { padding-right: clamp(1.5rem, 3vw, 3rem); } }
.layer__head { display: flex; justify-content: space-between; color: var(--fg-2); }
.layer__list { display: flex; flex-direction: column; }
.layer__list li {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--line);
  font-size: clamp(1.25rem, 1rem + 1.2vw, 1.875rem);
  font-weight: 400; letter-spacing: -0.02em;
  color: var(--fg-1);
}
.layer__list li .mono { color: var(--fg-3); text-transform: none; }
.layer--right .layer__list li { color: var(--fg-0); }
.layer__list li.hz { color: var(--fg-2); }
.layer__list li.hz .mono { color: var(--fg-3); }
.layer__list li.ok { color: var(--fg-0); }
.layer__list li.ok .mono { color: var(--accent); }

.layer__gap { height: 0.75rem; }

.abstraction__center {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1rem;
  padding: 2rem 0;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
@media (min-width: 900px) { .abstraction__center { border-top: 0; border-bottom: 0; border-left: 1px solid var(--line); border-right: 1px solid var(--line); } }
.abstraction__mark { font-size: 0.8125rem; font-weight: 500; letter-spacing: 0.24em; color: var(--fg-0); }
.abstraction__line { width: 1px; height: 4rem; background: linear-gradient(var(--line-3), var(--accent), var(--line-3)); position: relative; overflow: hidden; }
.abstraction__line::after { content: ''; position: absolute; left: 0; width: 1px; height: 1rem; background: var(--fg-0); animation: line-drop 3.2s linear infinite; }
@keyframes line-drop { from { top: -1rem; } to { top: 100%; } }
@media (min-width: 900px) { .abstraction__line { height: 6rem; } }

.abstraction__statements { margin-top: clamp(3rem, 6vw, 5rem); display: grid; gap: 1.5rem; }
@media (min-width: 900px) { .abstraction__statements { grid-template-columns: 1fr 1fr; gap: 3rem; } }
.abstraction__statements p { font-size: var(--text-xl); font-weight: 500; letter-spacing: -0.02em; line-height: 1.3; max-width: 28ch; }
.abstraction__statements p.dim { color: var(--fg-1); }

/* --------------------------------------------------------------------------
   04 — Teams
   -------------------------------------------------------------------------- */

.teams {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  display: grid;
  border-top: 1px solid var(--line); border-left: 1px solid var(--line);
}
@media (min-width: 760px) { .teams { grid-template-columns: 1fr 1fr; } }
.team {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border-right: 1px solid var(--line); border-bottom: 1px solid var(--line);
  display: grid; gap: 1.25rem;
  min-height: 18rem;
}
.team__head { display: flex; justify-content: space-between; color: var(--fg-3); }
.team__title { font-size: var(--text-xl); font-weight: 500; letter-spacing: -0.02em; line-height: 1.2; }
.team__desc { color: var(--fg-1); font-size: var(--text-sm); max-width: 40ch; }
.team__uses { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.5rem 1rem; padding-top: 1rem; border-top: 1px solid var(--line); margin-top: auto; }
.team__uses li { color: var(--fg-2); padding-left: 0.9rem; position: relative; }
.team__uses li::before { content: ''; position: absolute; left: 0; top: 0.55em; width: 4px; height: 1px; background: var(--fg-3); }

/* --------------------------------------------------------------------------
   05 — Validation pipeline
   -------------------------------------------------------------------------- */

.pipeline { margin-top: clamp(2.5rem, 5vw, 4rem); }
.pipeline__stages {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
  position: relative;
}
@media (min-width: 900px) { .pipeline__stages { grid-template-columns: repeat(6, minmax(0, 1fr)); } }
.stage {
  position: relative;
  padding: 1.25rem 0 1.5rem;
  border-bottom: 1px solid var(--line);
  display: grid; gap: 0.8rem;
  align-content: start;
}
@media (min-width: 900px) {
  .stage { padding: 1.5rem 1.25rem 1.75rem 0; border-bottom: 0; min-height: 13rem; }
  .stage + .stage { padding-left: 1.25rem; border-left: 1px solid var(--line); }
}
.stage__n { color: var(--fg-3); display: flex; justify-content: space-between; }
.stage__name { font-size: var(--text-sm); font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; }
.stage__desc { color: var(--fg-2); font-size: var(--text-sm); line-height: 1.55; }
.stage__req { margin-top: auto; color: var(--fg-3); display: flex; align-items: center; gap: 0.5em; }
.stage__req .dot { margin-right: 0; }
.stage--qpu .stage__req { color: var(--fg-1); }
.stage--qpu .stage__req .dot { background: var(--accent); }
.stage__bar { position: absolute; left: 0; right: 0; top: -1px; height: 1px; background: var(--accent-40); transform-origin: left; transform: scaleX(0); transition: transform 1200ms var(--ease); }
.pipeline__stages.in-view .stage__bar { transform: scaleX(1); }
.pipeline__stages.in-view .stage:nth-child(2) .stage__bar { transition-delay: 200ms; }
.pipeline__stages.in-view .stage:nth-child(3) .stage__bar { transition-delay: 400ms; }
.pipeline__stages.in-view .stage:nth-child(4) .stage__bar { transition-delay: 600ms; }
.pipeline__stages.in-view .stage:nth-child(5) .stage__bar { transition-delay: 800ms; }
.pipeline__stages.in-view .stage:nth-child(6) .stage__bar { transition-delay: 1000ms; }
.stage--qpu .stage__bar { background: var(--accent); }
.pipeline__foot { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem 2rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--fg-3); }
.pipeline__foot .mono b { color: var(--fg-1); font-weight: 400; }

/* --------------------------------------------------------------------------
   06 — Engineering stack
   -------------------------------------------------------------------------- */

.stack-layout { display: grid; gap: clamp(2rem, 4vw, 4rem); margin-top: clamp(2.5rem, 5vw, 4rem); align-items: start; }
@media (min-width: 900px) { .stack-layout { grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); } }

.stack { border-top: 1px solid var(--line); }
.stack__row {
  display: grid;
  grid-template-columns: 3.5rem 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--fg-1);
  position: relative;
  transition: color var(--dur) var(--ease);
}
.stack__row:hover { color: var(--fg-0); }
.stack__row .addr { color: var(--fg-3); }
.stack__row .name { font-family: var(--font-mono); font-size: var(--text-sm); letter-spacing: 0.08em; text-transform: uppercase; display: flex; align-items: center; gap: 1rem; }
.stack__row .name .sub { color: var(--fg-3); font-size: var(--text-xs); letter-spacing: var(--track-label); }
.stack__row .lang { color: var(--fg-3); border: 1px solid var(--line-2); padding: 0.2rem 0.45rem; border-radius: var(--radius); }
.stack__row .lang.c { color: var(--accent); border-color: var(--accent-40); }
.stack__row--core { background: linear-gradient(90deg, var(--accent-08), transparent 60%); }
.stack__row--core .name { color: var(--fg-0); }
.stack__row .conn { position: absolute; left: 1.25rem; bottom: -0.6rem; width: 1px; height: 1.2rem; background: var(--line-2); z-index: 1; }
.stack__row:last-child .conn { display: none; }
.stack__note { margin-top: 1rem; color: var(--fg-3); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem 1.5rem; }

.stack-copy { display: grid; gap: 1.5rem; }
.stack-copy .h-sub { max-width: 26ch; }
.stack-copy dl { border-top: 1px solid var(--line); }
.stack-copy dl div { display: grid; grid-template-columns: 6rem 1fr; gap: 1rem; padding: 0.75rem 0; border-bottom: 1px solid var(--line); font-size: var(--text-sm); color: var(--fg-1); }
.stack-copy dt { color: var(--fg-3); font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--track-label); text-transform: uppercase; padding-top: 0.2em; }
.stack-copy dd { margin: 0; max-width: 40ch; }

/* --------------------------------------------------------------------------
   Principles
   -------------------------------------------------------------------------- */

.principles {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  display: grid;
  gap: 2.5rem 2rem;
  border-top: 1px solid var(--line);
  padding-top: 2rem;
}
@media (min-width: 700px) { .principles { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1100px) { .principles { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.principle { display: grid; gap: 0.9rem; align-content: start; }
.principle .mono { color: var(--fg-3); }
.principle h3 { font-size: var(--text-sm); font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; }
.principle p { color: var(--fg-1); font-size: var(--text-sm); max-width: 28ch; line-height: 1.6; }

/* --------------------------------------------------------------------------
   07 — Research
   -------------------------------------------------------------------------- */

.docs { margin-top: clamp(2.5rem, 5vw, 4rem); border-top: 1px solid var(--line); }
.doc {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 0.5rem 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--fg-1);
  align-items: baseline;
}
@media (min-width: 760px) { .doc { grid-template-columns: 3.5rem minmax(0, 1fr) 10rem 6rem 8rem; gap: 1rem; } .doc .meta { display: contents; } }
.doc .n { color: var(--fg-3); }
.doc .t { font-size: var(--text-lg); font-weight: 500; letter-spacing: -0.015em; color: var(--fg-0); }
.doc .k, .doc .r, .doc .s { color: var(--fg-3); }
.doc .s { display: flex; align-items: center; gap: 0.5em; }
.doc .s .dot { margin-right: 0; }
@media (max-width: 759px) {
  .doc .k, .doc .r, .doc .s { grid-column: 2; }
  .doc .meta { grid-column: 2; display: flex; gap: 1.25rem; flex-wrap: wrap; }
}
.docs__note { padding: 1rem 0; color: var(--fg-3); display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }

/* --------------------------------------------------------------------------
   Final statement + contact
   -------------------------------------------------------------------------- */

.final { padding-block: clamp(7rem, 16vw, 14rem) clamp(5rem, 10vw, 8rem); }
.final__grid { position: relative; display: grid; gap: clamp(2.5rem, 5vw, 5rem); }
.final__statement h2 { font-size: clamp(2.25rem, 1.2rem + 4.6vw, 5rem); font-weight: 500; letter-spacing: -0.035em; line-height: 1.02; max-width: 20ch; text-wrap: balance; }
.final__statement h2 + h2 { margin-top: 0.35em; }
.final__statement h2.dim { color: var(--fg-2); }
.final__support { margin-top: clamp(2rem, 4vw, 3rem); font-size: var(--text-lg); font-weight: 500; letter-spacing: -0.015em; max-width: 36ch; color: var(--fg-1); }
.final__actions { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; align-items: center; }
.final__actions .mono { color: var(--fg-2); }
.final__actions .mono a { color: var(--fg-1); border-bottom: 1px solid var(--line-2); padding-bottom: 1px; }

/* Contact panel */
.contact { max-width: 34rem; }
.contact .fig__body { padding: 1.25rem 1rem; }
.contact__form { display: grid; gap: 1rem; }
.field { display: grid; gap: 0.4rem; }
.field label { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: var(--track-label); text-transform: uppercase; color: var(--fg-2); display: flex; justify-content: space-between; }
.field label .opt { color: var(--fg-3); }
.field input, .field select, .field textarea {
  width: 100%;
  background: var(--bg-0);
  border: 1px solid var(--line-2);
  border-radius: var(--radius);
  color: var(--fg-0);
  font: 400 var(--text-sm) / 1.4 var(--font-sans);
  padding: 0.7rem 0.75rem;
  transition: border-color var(--dur) var(--ease);
  -webkit-appearance: none; appearance: none;
}
.field select { background-image: linear-gradient(45deg, transparent 50%, var(--fg-2) 50%), linear-gradient(135deg, var(--fg-2) 50%, transparent 50%); background-position: calc(100% - 16px) 50%, calc(100% - 11px) 50%; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 2rem; }
.field textarea { min-height: 7rem; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--accent-70); }
.field input::placeholder, .field textarea::placeholder { color: var(--fg-3); }
.field-row { display: grid; gap: 1rem; }
@media (min-width: 560px) { .field-row { grid-template-columns: 1fr 1fr; } }
.contact__actions { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-top: 0.5rem; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.contact__status { color: var(--fg-2); min-height: 1.4em; }
.contact__status.is-ok { color: var(--accent); }
.contact__status.is-err { color: var(--fg-0); }
.contact__foot { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; color: var(--fg-3); padding: 0.7rem 1rem; border-top: 1px solid var(--line); }

@media (min-width: 1000px) {
  .final__grid { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); align-items: end; }
  .contact { justify-self: end; width: 100%; }
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.footer { border-top: 1px solid var(--line); padding-block: 2.5rem 2rem; color: var(--fg-2); }
.footer__top { display: grid; gap: 2rem; }
@media (min-width: 760px) { .footer__top { grid-template-columns: minmax(0, 1fr) auto; align-items: start; } }
.footer__brand { display: grid; gap: 0.75rem; }
.footer__links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.6rem 3rem; }
@media (min-width: 760px) { .footer__links { grid-template-columns: repeat(3, auto); gap: 0.6rem 3rem; } }
.footer__links a { font-size: var(--text-sm); color: var(--fg-1); }
.footer__links a:hover { color: var(--fg-0); }
.footer__bottom { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem 2rem; color: var(--fg-3); }

/* --------------------------------------------------------------------------
   Motion preferences
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
  .reveal { opacity: 1; transform: none; }
  .stage__bar { transform: scaleX(1); }
}

/* --------------------------------------------------------------------------
   Architecture connectors (generated by architecture.js)
   -------------------------------------------------------------------------- */

.arch__col > .arch__node, .arch__col > .arch__box { width: calc(100% - 3.25rem); }
.arch__col > .arch__box { max-width: 26rem; }

.arch-edge__base { fill: none; stroke: var(--line-3); stroke-width: 1; transition: stroke var(--dur) var(--ease); }
.arch-edge__flow {
  fill: none; stroke: var(--fg-1); stroke-width: 1;
  stroke-dasharray: 1 9; stroke-linecap: round;
  opacity: 0.35;
  animation: arch-flow 1.4s linear infinite;
  transition: opacity var(--dur) var(--ease), stroke var(--dur) var(--ease);
}
.arch-edge__flow--up { animation-direction: reverse; }
@keyframes arch-flow { to { stroke-dashoffset: -10; } }
.arch-edge.is-hot .arch-edge__base { stroke: var(--accent-40); }
.arch-edge.is-hot .arch-edge__flow { stroke: var(--accent); opacity: 1; animation-duration: 0.9s; }
.arch-edge.is-hot .arch-edge__base { marker-end: url(#arch-arrow-hot); }
.arch-arrow { fill: var(--line-3); }
.arch-arrow--hot { fill: var(--accent); }

.arch__edge-label {
  writing-mode: vertical-rl;
  transform: translateY(-50%) rotate(180deg);
  transition: color var(--dur) var(--ease);
}
.arch__edge-label.is-hot { color: var(--accent); }

/* Verify scan line */
.v-scan { stroke: var(--accent-40); stroke-width: 1; opacity: 0; }
.sys.is-active .v-scan { opacity: 1; animation: v-scan 4s linear infinite; }
@keyframes v-scan { from { transform: translateX(0); } to { transform: translateX(400px); } }

/* Fig. 01 draw-in */
.chart-draw { transition: stroke-dashoffset 1600ms var(--ease); }
.v-line--hi.chart-draw { transition-delay: 500ms; }
.chart-corr { opacity: 0; transition: opacity 600ms var(--ease) 1500ms; }
.is-drawn .chart-corr { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  .arch-edge__flow { animation: none; stroke-dasharray: none; opacity: 0; }
  .v-scan { animation: none; }
  .chart-corr { opacity: 1; }
}

/* --------------------------------------------------------------------------
   Overflow guards: grid/flex children must be allowed to shrink so nowrap
   technical labels truncate instead of widening the page.
   -------------------------------------------------------------------------- */
.fig__bar > * { min-width: 0; }
.sec__intro > *, .arch-layout > *, .sys > *, .stack-layout > *, .final__grid > *, .hero__grid > *, .console__grid > *, .console__bottom > * { min-width: 0; }
.arch, .arch__fig, .arch__col { min-width: 0; max-width: 100%; }
.sec__head .sec__ref { min-width: 0; }
@media (max-width: 560px) {
  .sec__head { align-items: flex-start; }
  .sec__head .sec__ref { max-width: 50%; }
  .sys__tags { gap: 0.5rem 1.25rem; }
}

/* Narrow-screen refinements */
@media (max-width: 640px) {
  .stack__row { grid-template-columns: 2.25rem 1fr auto; }
  .stack__row .name { flex-direction: column; align-items: flex-start; gap: 0.25rem; }
  .stack__row .conn { left: 0.6rem; }
  .arch__box-label > .mono { display: none; }
  .sys__vis .v-text { font-size: 11px; }
  .sys__vis .v-frame { font-size: 10px; }
}