:root {
  color-scheme: dark;
  --bg: #05070a;
  --panel: rgba(255,255,255,.075);
  --panel-strong: rgba(255,255,255,.12);
  --text: #f7fbff;
  --muted: #a9b6c7;
  --line: rgba(255,255,255,.16);
  --cyan: #41e7ff;
  --green: #78ff9f;
  --red: #ff5f7a;
  --blue: #7b8dff;
  --yellow: #ffd66b;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 0%, rgba(65,231,255,.18), transparent 32rem),
    radial-gradient(circle at 88% 12%, rgba(123,141,255,.22), transparent 36rem),
    linear-gradient(145deg, rgba(120,255,159,.08), transparent 45%),
    var(--bg);
}

a { color: inherit; text-decoration: none; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  backdrop-filter: blur(22px);
  background: rgba(5, 7, 10, .72);
  border-bottom: 1px solid var(--line);
}
.brand, nav { display: flex; align-items: center; gap: .8rem; }
.brand { font-weight: 750; letter-spacing: .01em; }
.brand-mark {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
  background: conic-gradient(from 90deg, var(--cyan), var(--blue), var(--green), var(--cyan));
  box-shadow: 0 0 28px rgba(65,231,255,.55);
}
nav a {
  color: var(--muted);
  font-size: .92rem;
  padding: .45rem .2rem;
}
nav a:hover, nav a:focus-visible { color: var(--text); }

.hero {
  position: relative;
  min-height: 88vh;
  display: grid;
  grid-template-columns: minmax(0, .92fr) minmax(22rem, .62fr);
  align-items: center;
  gap: clamp(1.4rem, 4vw, 4rem);
  padding: clamp(5rem, 10vh, 8rem) clamp(1rem, 4vw, 3rem) 3rem;
  overflow: hidden;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: .28;
}
.hero-media video, .hero-media canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-media:after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(5,7,10,.92), rgba(5,7,10,.72) 54%, rgba(5,7,10,.88)),
    linear-gradient(180deg, rgba(5,7,10,.1), rgba(5,7,10,.88));
}
.hero-copy { max-width: 58rem; }
.eyebrow {
  margin: 0 0 .9rem;
  color: var(--cyan);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  max-width: 12ch;
  margin-bottom: 1.25rem;
  font-size: clamp(3.4rem, 7.2vw, 7.4rem);
  line-height: .86;
  letter-spacing: 0;
}
h2 {
  font-size: clamp(2rem, 4.8vw, 4.6rem);
  line-height: .93;
  letter-spacing: 0;
}
h3 { font-size: 1.15rem; }
.lede {
  max-width: 42rem;
  color: #d9e5f5;
  font-size: clamp(1.1rem, 2vw, 1.45rem);
  line-height: 1.45;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem; }
.button {
  display: inline-flex;
  align-items: center;
  min-height: 3rem;
  padding: .85rem 1.05rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-weight: 760;
}
.button.primary {
  color: #031014;
  background: linear-gradient(135deg, var(--cyan), var(--green));
  border-color: transparent;
}
.button.secondary { background: rgba(255,255,255,.08); }
.hero-stack {
  display: grid;
  gap: 1rem;
  align-self: end;
}
.hero-watch {
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 1.2rem;
  background: rgba(255,255,255,.08);
  box-shadow: 0 34px 95px rgba(0,0,0,.44);
}
.hero-watch video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #05070a;
}
.hero-watch span {
  display: block;
  padding: .75rem .9rem;
  color: #d9e5f5;
  border-top: 1px solid var(--line);
  font-weight: 780;
}
.signal-card {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  background: rgba(5,7,10,.62);
  backdrop-filter: blur(18px);
}
.signal-row {
  display: flex;
  justify-content: space-between;
  gap: 1.2rem;
  padding: .85rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}
.signal-row:last-child { border-bottom: 0; }
.signal-row strong { color: var(--text); text-align: right; }

section { padding: clamp(4rem, 8vw, 8rem) clamp(1rem, 4vw, 3rem); }
.section-heading {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.3fr);
  gap: 2rem;
  align-items: end;
  margin-bottom: 2rem;
}
.lab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 24rem);
  gap: 1rem;
}
.video-section { padding-top: clamp(3rem, 6vw, 5rem); }
.video-card {
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 1.4rem;
  background: rgba(255,255,255,.08);
  box-shadow: 0 36px 120px rgba(0,0,0,.36);
}
.video-card video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #05070a;
}
.video-caption {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  border-top: 1px solid var(--line);
  background: var(--line);
}
.video-caption span {
  padding: .9rem;
  color: #d9e5f5;
  background: rgba(5,7,10,.88);
  font-weight: 780;
  text-align: center;
}
.lab-stage, .lab-controls, .path-grid article, .signals-section, .start-section {
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  background: linear-gradient(150deg, rgba(255,255,255,.105), rgba(255,255,255,.052));
}
.lab-stage {
  min-height: 30rem;
  overflow: hidden;
  display: grid;
  grid-template-rows: minmax(19rem, 1fr) auto;
}
.cell-diagram {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: .75rem;
  align-items: center;
  padding: clamp(1rem, 3vw, 2rem);
  background:
    radial-gradient(circle at 22% 18%, rgba(65,231,255,.14), transparent 16rem),
    radial-gradient(circle at 82% 30%, rgba(120,255,159,.12), transparent 18rem);
}
.station {
  position: relative;
  min-height: 9rem;
  display: grid;
  align-content: center;
  gap: .45rem;
  padding: 1rem;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 1.1rem;
  background: rgba(5,7,10,.6);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.08);
}
.station strong { font-size: clamp(.92rem, 1.5vw, 1.1rem); }
.station small { color: var(--muted); line-height: 1.35; }
.station-light {
  width: .8rem;
  height: .8rem;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 22px rgba(120,255,159,.7);
}
.station.warn .station-light {
  background: var(--yellow);
  box-shadow: 0 0 22px rgba(255,214,107,.7);
}
.station.stop .station-light {
  background: var(--red);
  box-shadow: 0 0 22px rgba(255,95,122,.7);
}
.conveyor-track {
  position: absolute;
  left: clamp(1rem, 3vw, 2rem);
  right: clamp(1rem, 3vw, 2rem);
  bottom: 2rem;
  height: .45rem;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(65,231,255,.28), rgba(123,141,255,.24), rgba(120,255,159,.28));
}
#part-marker {
  position: absolute;
  top: 50%;
  left: 7%;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: .3rem;
  transform: translate(-50%, -50%) rotate(45deg);
  background: var(--cyan);
  box-shadow: 0 0 24px rgba(65,231,255,.75);
  transition: left .35s ease, background .25s ease;
}
.logic-panel {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}
.logic-step {
  min-height: 4.6rem;
  padding: .9rem;
  color: #d9e5f5;
  background: rgba(5,7,10,.88);
  line-height: 1.35;
}
.logic-step span {
  display: block;
  margin-bottom: .35rem;
  color: var(--cyan);
  font-size: .72rem;
  font-weight: 900;
  letter-spacing: .14em;
}
.logic-step.warn span { color: var(--yellow); }
.logic-step.stop span { color: var(--red); }
.lab-controls { padding: 1rem; }
.lab-controls label {
  display: grid;
  gap: .65rem;
  margin-bottom: 1rem;
  color: #d9e5f5;
  font-weight: 720;
}
input[type="range"] { accent-color: var(--cyan); width: 100%; }
fieldset { border: 0; padding: 0; margin: .4rem 0 1rem; display: flex; flex-wrap: wrap; gap: .5rem; }
legend { width: 100%; margin-bottom: .6rem; color: var(--muted); }
.chip {
  border: 1px solid var(--line);
  color: var(--text);
  background: rgba(255,255,255,.08);
  border-radius: 999px;
  padding: .65rem .85rem;
  cursor: pointer;
}
.chip.active { background: rgba(65,231,255,.18); border-color: rgba(65,231,255,.7); }
.lab-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .55rem;
  margin: 1rem 0;
}
.lab-metrics div {
  min-height: 4.2rem;
  display: grid;
  align-content: center;
  gap: .25rem;
  padding: .75rem;
  border: 1px solid var(--line);
  border-radius: .85rem;
  background: rgba(255,255,255,.055);
}
.lab-metrics span {
  color: var(--muted);
  font-size: .78rem;
}
.lab-metrics strong { font-size: .98rem; }
.lab-advice { color: #d9e5f5; line-height: 1.5; margin: 0; }
.path-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}
.path-grid article { padding: 1.1rem; min-height: 14rem; }
.path-icon {
  display: inline-grid;
  place-items: center;
  width: 2.3rem;
  height: 2.3rem;
  margin-bottom: 3rem;
  border-radius: 50%;
  color: #031014;
  background: var(--green);
  font-weight: 900;
}
.path-grid p, .signal-list { color: var(--muted); line-height: 1.55; }
.signals-section {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 2rem;
  margin: clamp(2rem, 4vw, 3rem);
}
.signal-list { margin: 0; padding-left: 1.1rem; }
.signal-list li { margin: .8rem 0; }
.start-section { margin: clamp(2rem, 4vw, 3rem); max-width: 72rem; }
.start-section p { max-width: 42rem; color: var(--muted); line-height: 1.55; }
footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem clamp(1rem, 4vw, 3rem);
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.not-found {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.error-shell {
  width: min(100%, 48rem);
  padding: clamp(1.5rem, 6vw, 4rem);
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  background: rgba(5, 7, 10, .72);
  box-shadow: 0 28px 90px rgba(0, 0, 0, .42);
}

.error-shell .brand { margin-bottom: clamp(3rem, 10vw, 6rem); }
.error-shell h1 {
  max-width: 9ch;
  font-size: clamp(3.2rem, 10vw, 7rem);
}

@media (max-width: 820px) {
  .site-header { align-items: flex-start; }
  nav { flex-wrap: wrap; justify-content: flex-end; }
  .hero, .section-heading, .lab-grid, .signals-section {
    grid-template-columns: 1fr;
  }
  .hero { align-items: end; min-height: auto; padding-top: 7rem; }
  h1 { font-size: clamp(2.85rem, 15vw, 4.6rem); max-width: 9ch; }
  .hero-actions { margin-top: 1.2rem; }
  .hero-stack { align-self: stretch; }
  .path-grid { grid-template-columns: 1fr; }
  .video-caption { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lab-stage { min-height: 0; }
  .cell-diagram { grid-template-columns: 1fr; padding-bottom: 3rem; }
  .station { min-height: 4.8rem; }
  .conveyor-track { left: 2rem; right: 2rem; bottom: 1rem; }
  .logic-panel { grid-template-columns: 1fr; }
  .lab-metrics { grid-template-columns: 1fr; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-media video, #hero-grid { display: none; }
  .video-card video { animation: none; }
  .hero-media { background: linear-gradient(135deg, rgba(65,231,255,.22), rgba(123,141,255,.2), rgba(120,255,159,.12)); }
}