/* Night site: black, caps, small type, one mark. */
:root {
  color-scheme: dark;
  --paper: #000;
  --ink: #f2f2f2;
  --muted: #8a8a8a;
  --line: #262626;
  --signal: #d0b34a;
  --font-body: "Inter", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Fragment Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --gutter: clamp(1.5rem, 5vw, 4rem);
}

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

html { background: #000; }

body.night {
  min-height: 100svh;
  margin: 0;
  background: #000;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.9;
  letter-spacing: 0.075em;
  text-transform: uppercase;
  -webkit-font-smoothing: antialiased;
}

body.night a { color: inherit; text-decoration: none; }

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

.skip-link { position: absolute; left: -999px; }
.skip-link:focus { left: 1rem; top: 1rem; z-index: 10; background: #000; padding: 0.5rem; }

a:focus-visible { outline: 1px solid var(--signal); outline-offset: 4px; }

.mark-link {
  position: absolute;
  top: 1.5rem;
  left: 50%;
  display: block;
  width: 44px;
  transform: translateX(-50%);
}

.mark-link img { width: 100%; height: auto; opacity: 0.9; }

.night-nav,
.night-top {
  position: fixed;
  left: 50%;
  z-index: 5;
  display: flex;
  justify-content: space-between;
  width: min(calc(100% - 2 * var(--gutter)), 30rem);
  transform: translateX(-50%);
}

.night-nav {
  bottom: 3.75rem;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  color: var(--muted);
}

.night-nav a:first-child { justify-self: start; }
.night-nav a:last-child { justify-self: end; }

.night-top {
  top: 2rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-weight: 400;
  font-variant-numeric: tabular-nums;
  pointer-events: none;
}

.night-nav a {
  position: relative;
  padding: 0.25rem 0;
  transition: color 240ms ease;
}

.night-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 420ms cubic-bezier(0.2, 0.7, 0.1, 1);
}

.night-nav a:hover,
.night-nav a:focus-visible,
.night-nav a[aria-current="page"] { color: var(--ink); }

.night-nav a:hover::after,
.night-nav a:focus-visible::after,
.night-nav a[aria-current="page"]::after { transform: scaleX(1); }

/* Home */
.night-home {
  display: grid;
  place-items: center;
  min-height: 100svh;
}

.hero-particle-mark {
  --particle-halo: 2rem;
  position: relative;
  aspect-ratio: 1194 / 950;
  width: clamp(140px, 18vw, 200px);
  color: var(--ink);
}

.hero-particle-fallback {
  position: absolute; inset: 0; display: block;
  width: 100%; height: 100%; overflow: visible;
}

.hero-particle-canvas {
  position: absolute;
  top: calc(-1 * var(--particle-halo));
  left: calc(-1 * var(--particle-halo));
  display: block;
  width: calc(100% + (2 * var(--particle-halo)));
  height: calc(100% + (2 * var(--particle-halo)));
  opacity: 0;
  pointer-events: none;
}

.hero-particle-mark.is-ready .hero-particle-canvas { opacity: 1; }
.hero-particle-mark.is-ready .hero-particle-fallback { visibility: hidden; }

/* Interior */
.night-page {
  width: min(100%, 36rem);
  margin-inline: auto;
  padding: 8rem var(--gutter) 9rem;
}

.night-page h1 {
  margin: 0 0 2.5rem;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--muted);
}

.night-list { margin: 0; padding: 0; list-style: none; }

.night-list li {
  position: relative;
  padding: 1.1rem 0;
  border-top: 1px solid var(--line);
}

.night-list li:last-child { border-bottom: 1px solid var(--line); }

.night-list b { display: block; font-weight: 400; color: var(--ink); }
.night-list span { display: block; color: var(--muted); }

.night-list a { display: block; }
.night-list a:hover b, .night-list a:focus-visible b { color: var(--signal); }

.night-list li::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: 100%; height: 1px;
  background: var(--ink);
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left center;
}

.has-js .night-list li.is-inview::before {
  animation: hairline-draw 1500ms cubic-bezier(0.2, 0.7, 0.1, 1) both;
  animation-delay: calc(var(--row, 0) * 120ms);
}

@keyframes hairline-draw {
  0% { opacity: 1; transform: scaleX(0); }
  55% { opacity: 1; transform: scaleX(1); }
  100% { opacity: 0; transform: scaleX(1); }
}

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

/* Rack drawing */
.rack-figure {
  margin: 0 0 clamp(3rem, 6vw, 5rem);
  padding: clamp(2rem, 4vw, 3.5rem) 0;
  border-top: 1px solid var(--line);
  display: grid;
  justify-items: center;
  gap: 1.5rem;
}

.rack-stage {
  width: min(100%, 34rem);
}

.rack-drawing {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
  color: var(--ink);
}

.rack-drawing text {
  stroke: none;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  fill: var(--muted);
}

.rack-drawing .leader,
.rack-drawing .dash {
  stroke: var(--muted);
}

.rack-drawing .dash {
  stroke-dasharray: 2 3;
}

.rack-drawing .frame {
  stroke: var(--muted);
}

.rack-drawing .cable {
  stroke: var(--signal);
  stroke-dasharray: 3 5;
}

.rack-drawing .rack-scan {
  opacity: 0;
  stroke: var(--signal);
}

.rack-figure figcaption {
  margin: 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-align: center;
}

.has-js .rack-lines > *,
.has-js .rack-labels .leader {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
}

.has-js .rack-labels text,
.has-js .rack-cables {
  opacity: 0;
}

.has-js .rack-figure.is-inview .rack-lines > *,
.has-js .rack-figure.is-inview .rack-labels .leader {
  animation: rack-draw 1400ms cubic-bezier(0.3, 0.6, 0.1, 1) both;
  animation-delay: calc(var(--i, 0) * 16ms);
}

.has-js .rack-figure.is-inview .rack-labels .leader {
  animation-delay: 1500ms;
}

.has-js .rack-figure.is-inview .rack-labels text,
.has-js .rack-figure.is-inview .rack-cables {
  animation: rack-fade 700ms ease 1900ms both;
}

.rack-figure.is-inview .rack-cables .cable {
  animation: rack-flow 2400ms linear 2000ms infinite;
}

.rack-figure.is-inview .rack-scan {
  animation: rack-scan 9s cubic-bezier(0.4, 0, 0.2, 1) 3s infinite;
}

.rack-figure.is-inview .port {
  animation: rack-port 3.2s ease-in-out infinite;
  animation-delay: calc(var(--i, 0) * -210ms);
}

.rack-lines .port {
  fill: currentColor;
  fill-opacity: 0;
}

@keyframes rack-draw {
  from { stroke-dashoffset: 1; }
  to { stroke-dashoffset: 0; }
}

@keyframes rack-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes rack-flow {
  to { stroke-dashoffset: -16; }
}

@keyframes rack-scan {
  0% { opacity: 0; transform: translateY(0); }
  8% { opacity: 0.9; }
  50% { opacity: 0.9; transform: translateY(300px); }
  58%, 100% { opacity: 0; transform: translateY(300px); }
}

@keyframes rack-port {
  0%, 70%, 100% { fill-opacity: 0; }
  80% { fill-opacity: 0.75; }
}

@media (prefers-reduced-motion: reduce) {
  .rack-figure.is-inview .rack-cables .cable,
  .rack-figure.is-inview .rack-scan,
  .rack-figure.is-inview .port {
    animation: none !important;
  }
}

/* 3D rack: the line drawing stays as the fallback when WebGL is unavailable */
.rack-3d {
  display: none;
  width: 100%;
  aspect-ratio: 5 / 6;
}

.rack-figure.has-3d .rack-3d {
  display: block;
}

.rack-figure.has-3d .rack-drawing {
  display: none;
}

.rack-figure.has-3d .rack-stage {
  width: min(100%, 38rem);
}


/* Systems is only the rack */
.night-systems {
  display: grid;
  justify-items: center;
  width: 100%;
  min-height: 100svh;
  padding: 5.5rem var(--gutter) 9rem;
}

.night-systems .rack-figure {
  width: min(100%, 60rem);
  margin: 0;
  padding: 0;
  border: 0;
}

.night-systems .rack-stage { width: 100%; }

.night-systems .rack-3d {
  width: 100%;
  height: calc(100svh - 19rem);
  min-height: 22rem;
  aspect-ratio: auto;
}

.night-systems .rack-figure.has-3d .rack-3d { display: block; }

.rack-status {
  margin-top: 0.5rem;
  color: var(--muted);
  transition: color 240ms ease;
}

.rack-status:hover,
.rack-status:focus-visible { color: var(--ink); }

.rack-figure figcaption { min-height: 1.9em; }

/* About is only links */
.night-links { margin-top: 18svh; }
.night-links li { padding: 1.4rem 0; }
.night-links a { display: block; }