/* OnChip Lab — sodium-vapor stepper bay. Desktop-first. System fonts only. */
:root {
  --void: #090b10;
  --bay: #10141c;
  --panel: #161b26;
  --line: #2a3344;
  --ink: #e8eaef;
  --mute: #8b93a3;
  --amber: #ff6900;
  --amber-hot: #e85d00;
  --danger: #fb2c36;
  --sans: "Avenir Next", "Segoe UI", ui-sans-serif, system-ui, sans-serif;
  --mono: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  --max: 1180px;
  --radius: 10px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
::selection {
  background: rgba(255, 105, 0, 0.28);
  color: var(--ink);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(900px 480px at 88% -10%, rgba(255, 105, 0, 0.14), transparent 52%),
    linear-gradient(180deg, rgba(16, 20, 28, 0.4), transparent 28%),
    var(--void);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.6;
}

.stage {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(42, 51, 68, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 51, 68, 0.35) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 50% 0%, #000 20%, transparent 75%);
}

a {
  color: var(--amber);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: color 0.2s ease, filter 0.2s ease;
}
a:hover {
  color: #ff8a3d;
}
a:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.wrap {
  width: min(var(--max), calc(100% - 5rem));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(9, 11, 16, 0.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  border-bottom-color: var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.4rem;
  padding: 0.95rem 0;
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.wordmark svg {
  width: 26px;
  height: 26px;
  display: block;
}
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 0.38rem 0.7rem;
  font: inherit;
  font-size: 0.78rem;
  cursor: pointer;
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem 1.2rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.86rem;
}
.nav-list a {
  color: var(--mute);
  text-decoration: none;
}
.nav-list a:hover,
.nav-list a[aria-current="page"] {
  color: var(--ink);
}

.btn {
  display: inline-block;
  background: var(--amber);
  color: #140a00;
  text-decoration: none;
  padding: 0.58rem 1.05rem;
  border-radius: var(--radius);
  font-size: 0.88rem;
  font-weight: 600;
  border: 1px solid var(--amber);
  cursor: pointer;
  box-shadow: 0 0 24px rgba(255, 105, 0, 0.28);
  transition: filter 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.btn:hover {
  filter: brightness(1.08);
  color: #140a00;
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
  box-shadow: none;
}
.btn-ghost:hover {
  background: var(--panel);
  color: var(--ink);
  filter: none;
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.8rem;
  align-items: center;
  padding: 4.4rem 0 3.2rem;
}
.kicker {
  margin: 0 0 0.85rem;
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--amber);
}
.hero h1 {
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 700;
}
.lede {
  margin: 1.15rem 0 1.4rem;
  color: var(--mute);
  max-width: 36rem;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-bottom: 1.4rem;
}
.install {
  margin: 0;
  background: var(--bay);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.95rem 1.05rem;
  overflow: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: #d7dde8;
  box-shadow: inset 0 0 0 1px rgba(255, 105, 0, 0.08);
}
.install .cmt {
  color: #6d7688;
}
.install .tok {
  color: var(--amber);
}
.bay-art {
  background: var(--bay);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}
.bay-art svg {
  width: 100%;
  height: auto;
  display: block;
}

.grid3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
  padding: 0 0 3.6rem;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.25rem 1.3rem;
}
.card svg {
  width: 100%;
  height: auto;
  display: block;
  margin-bottom: 0.85rem;
}
.card h3 {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
}
.card p {
  margin: 0;
  color: var(--mute);
  font-size: 0.95rem;
}

.metal {
  padding: 0 0 3.8rem;
}
.metal h2,
.sdk h2,
.two h2,
.page h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  letter-spacing: -0.03em;
}
.sub {
  color: var(--mute);
  margin: 0 0 1.6rem;
  max-width: 38rem;
}
.steps {
  display: grid;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 3.2rem 1fr;
  gap: 1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.15rem;
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  color: var(--amber);
  font-family: var(--mono);
  font-size: 0.85rem;
  padding-top: 0.15rem;
}
.steps strong {
  display: block;
  margin-bottom: 0.2rem;
}
.steps span {
  color: var(--mute);
  font-size: 0.95rem;
}

.sdk {
  padding: 0 0 3.8rem;
}
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.7rem;
}
.tab {
  background: transparent;
  color: var(--mute);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}
.tab.is-on,
.tab:hover {
  color: #140a00;
  background: var(--amber);
  border-color: var(--amber);
}
.pane {
  display: none;
  margin: 0;
  background: #0c0f16;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.1rem 1.2rem;
  overflow: auto;
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.55;
  color: #d7dde8;
}
.pane.is-on {
  display: block;
}
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 1rem;
}
.chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  font-size: 0.75rem;
  color: var(--mute);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 0 0 3.8rem;
}
.two .card h2 {
  font-size: 1.25rem;
  margin-bottom: 0.55rem;
}
.live {
  display: inline-block;
  margin-bottom: 0.55rem;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--amber);
}

.cta-band {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: center;
  padding: 2.2rem 0 4.2rem;
  border-top: 1px solid var(--line);
}
.cta-band h2 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}
.cta-band p {
  color: var(--mute);
  margin: 0 0 1.1rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.2rem 0 2.6rem;
  font-size: 0.86rem;
  color: var(--mute);
}
.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 1.4rem;
}
.site-footer a {
  color: var(--mute);
  text-decoration: none;
}
.site-footer a:hover {
  color: var(--ink);
}
.site-footer strong {
  display: block;
  color: var(--ink);
  margin-bottom: 0.45rem;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.page {
  padding: 3.4rem 0 4.4rem;
}
.page-hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: end;
  margin-bottom: 2.2rem;
}
.page-hero svg,
.note-art svg {
  width: 100%;
  height: auto;
  display: block;
  background: var(--bay);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.notes {
  display: grid;
  gap: 1rem;
}
.note {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem 1.3rem;
}
.note h2 {
  margin: 0.2rem 0 0.45rem;
  font-size: 1.2rem;
}
.doc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

form {
  display: grid;
  gap: 0.4rem;
  max-width: 28rem;
}
label {
  margin-top: 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}
input,
textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--bay);
  color: var(--ink);
  font: inherit;
}
input:focus,
textarea:focus {
  outline: 2px solid var(--amber);
  outline-offset: 1px;
}

.scan {
  animation: scan 4.8s linear infinite;
}
@keyframes scan {
  from {
    transform: translateY(-120px);
  }
  to {
    transform: translateY(280px);
  }
}
.lamp {
  animation: lamp 2.4s ease-in-out infinite alternate;
}
@keyframes lamp {
  from {
    opacity: 0.55;
  }
  to {
    opacity: 1;
  }
}
.draw {
  stroke-dasharray: 640;
  stroke-dashoffset: 640;
  animation: draw 1.7s ease forwards;
}
@keyframes draw {
  to {
    stroke-dashoffset: 0;
  }
}
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.reveal.is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .scan,
  .lamp,
  .draw,
  .reveal {
    animation: none;
    opacity: 1;
    transform: none;
    stroke-dashoffset: 0;
  }
}

@media (max-width: 800px) {
  .wrap {
    width: min(var(--max), calc(100% - 1.5rem));
  }
  .nav-toggle {
    display: inline-block;
  }
  .header-inner {
    flex-wrap: wrap;
  }
  .nav-list {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.65rem;
    padding-top: 0.4rem;
  }
  .nav-list.is-open {
    display: flex;
  }
  .hero,
  .grid3,
  .two,
  .cta-band,
  .page-hero,
  .foot-grid,
  .doc-grid {
    grid-template-columns: 1fr;
  }
  .hero {
    padding-top: 2.2rem;
  }
  .steps li {
    grid-template-columns: 2.4rem 1fr;
  }
}