:root {
  --ink: #05070d;
  --ink-soft: #0a0f1b;
  --ink-raised: #111724;
  --paper: #f3f5f5;
  --paper-bright: #fbfcfc;
  --text: #11151c;
  --text-soft: #5f6773;
  --line: rgba(16, 22, 31, .13);
  --line-dark: rgba(221, 244, 255, .14);
  --white: #f5fbff;
  --cyan: #50ddff;
  --blue: #5d9bff;
  --violet: #a47aff;
  --spectrum: linear-gradient(105deg, #51e3ff 0%, #83bcff 45%, #c099ff 76%, #ff9eca 100%);
  --font-sans: 'Manrope', Arial, sans-serif;
  --font-mono: 'DM Mono', Consolas, monospace;
  --shell: min(1180px, calc(100vw - 48px));
  --signal-progress: 0%;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background: var(--paper);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
}
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { color: inherit; }
.shell { width: var(--shell); margin-inline: auto; }
.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  color: var(--ink);
  background: var(--white);
  transform: translateY(-140%);
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); }

.site-nav {
  position: fixed;
  z-index: 100;
  top: 0;
  right: 0;
  left: 0;
  color: var(--white);
  border-bottom: 1px solid transparent;
  transition: background-color .35s ease, border-color .35s ease, backdrop-filter .35s ease;
}
.site-nav.scrolled {
  background: rgba(5, 7, 13, .84);
  border-color: rgba(255, 255, 255, .09);
  backdrop-filter: blur(18px);
}
.nav-inner {
  height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: .83rem;
  font-weight: 800;
  letter-spacing: .16em;
}
.brand-mark { width: 29px; height: 29px; flex: 0 0 auto; }
.brand-mark-image { width: 42px; height: 42px; object-fit: contain; filter: drop-shadow(0 0 8px rgba(80, 221, 255, .22)); }
.nav-links { display: flex; align-items: center; gap: 34px; }
.nav-links a {
  position: relative;
  color: rgba(245, 251, 255, .68);
  font-size: .84rem;
  font-weight: 600;
  transition: color .2s ease;
}
.nav-links a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  right: 0;
  bottom: -9px;
  left: 0;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--white); }
.nav-links a.active::after { transform: scaleX(1); }
.nav-cta {
  padding: 11px 17px;
  color: var(--white) !important;
  border: 1px solid rgba(255, 255, 255, .26);
  border-radius: 100px;
  transition: background-color .2s ease, border-color .2s ease !important;
}
.nav-cta:hover { background: rgba(255, 255, 255, .09); border-color: rgba(255, 255, 255, .5); }
.nav-toggle { display: none; border: 0; background: transparent; }

.hero {
  position: relative;
  min-height: 900px;
  height: 100svh;
  overflow: hidden;
  color: var(--white);
  background: var(--ink);
}
.hero-image, .hero-wash, .hero-grid { position: absolute; inset: 0; }
.hero-image {
  background: url('../images/light-based-dev-kit-hero.png') center center / cover no-repeat;
  transform: scale(1.015);
}
.hero-wash {
  background:
    linear-gradient(90deg, rgba(3, 5, 10, .97) 0%, rgba(3, 5, 10, .89) 34%, rgba(3, 5, 10, .26) 67%, rgba(3, 5, 10, .12) 100%),
    linear-gradient(0deg, rgba(3, 5, 10, .65) 0%, transparent 34%);
}
.hero-grid {
  opacity: .16;
  background-image: linear-gradient(rgba(109, 202, 255, .18) 1px, transparent 1px), linear-gradient(90deg, rgba(109, 202, 255, .14) 1px, transparent 1px);
  background-size: 74px 74px;
  mask-image: linear-gradient(90deg, #000 0%, transparent 72%);
}
.hero-inner { position: relative; height: 100%; display: flex; align-items: center; }
.hero-copy { width: min(680px, 61vw); padding-top: 66px; }
.hero h1 {
  margin: 0;
  font-size: clamp(3.55rem, 6.1vw, 6.6rem);
  line-height: .96;
  letter-spacing: -.065em;
  font-weight: 600;
}
.hero h1 span {
  padding-right: .08em;
  margin-right: -.08em;
  color: transparent;
  background: var(--spectrum);
  background-clip: text;
  -webkit-background-clip: text;
}
.hero-lede {
  max-width: 620px;
  margin: 32px 0 0;
  color: rgba(239, 249, 255, .7);
  font-size: 1.07rem;
  line-height: 1.75;
}
.hero-actions { margin-top: 38px; display: flex; align-items: center; gap: 13px; }
.button {
  min-height: 50px;
  padding: 0 21px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .02em;
  transition: transform .25s ease, background-color .25s ease, border-color .25s ease;
}
.button:hover { transform: translateY(-2px); }
.button-primary { color: #071017; background: #eefaff; box-shadow: 0 0 35px rgba(80, 221, 255, .12); }
.button-primary:hover { background: #fff; box-shadow: 0 0 38px rgba(80, 221, 255, .24); }
.button-quiet { color: var(--white); border-color: rgba(255, 255, 255, .22); background: rgba(255,255,255,.03); }
.button-quiet:hover { border-color: rgba(255, 255, 255, .46); background: rgba(255,255,255,.07); }
.hero-notes {
  margin: 44px 0 0;
  padding: 22px 0 0;
  display: flex;
  gap: 25px;
  list-style: none;
  color: rgba(239, 249, 255, .5);
  border-top: 1px solid rgba(255, 255, 255, .12);
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .07em;
  text-transform: uppercase;
}
.hero-notes li { display: flex; align-items: center; gap: 9px; }
.hero-notes li::before { content: ''; width: 3px; height: 3px; border-radius: 50%; background: var(--cyan); }
.scroll-cue {
  position: absolute;
  right: 4.2vw;
  bottom: 42px;
  display: flex;
  align-items: center;
  gap: 15px;
  color: rgba(245, 251, 255, .52);
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.scroll-cue svg { width: 22px; fill: none; stroke: currentColor; stroke-width: 1.4; }

.section { padding: 130px 0; }
.section-kicker {
  margin-bottom: 55px;
  padding-bottom: 14px;
  color: var(--text-soft);
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .11em;
  text-transform: uppercase;
}
.section-kicker p { margin: 0; }
.section-kicker-light { color: rgba(239, 249, 255, .49); border-color: var(--line-dark); }
.intro { background: var(--paper-bright); }
.intro-layout { display: grid; grid-template-columns: 1.35fr .65fr; gap: 10%; align-items: start; }
.display-copy {
  margin: 0;
  max-width: 770px;
  font-size: clamp(2.7rem, 5.1vw, 5.15rem);
  line-height: 1.04;
  letter-spacing: -.055em;
  font-weight: 500;
}
.intro-copy { padding-top: 10px; }
.intro-copy p { margin: 0 0 23px; color: var(--text-soft); font-size: .98rem; line-height: 1.78; }
.principles { margin-top: 105px; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.principle { min-height: 400px; padding: 31px; border-right: 1px solid var(--line); }
.principle:first-child { border-left: 1px solid var(--line); }
.principle-index { color: #7e8792; font-family: var(--font-mono); font-size: .61rem; letter-spacing: .09em; }
.principle-image {
  width: calc(100% + 62px);
  height: 170px;
  margin: 25px -31px 23px;
  object-fit: cover;
  border-block: 1px solid var(--line);
}
.principle h3 { margin: 0 0 13px; font-size: 1.22rem; font-weight: 600; letter-spacing: -.025em; }
.principle p { margin: 0; color: var(--text-soft); font-size: .86rem; line-height: 1.75; }

.kit-section { overflow: hidden; color: var(--white); background: var(--ink); }
.kit-heading { display: grid; grid-template-columns: 1.35fr .65fr; gap: 10%; align-items: end; }
.mono-label { margin: 0 0 20px; color: var(--cyan); font-family: var(--font-mono); font-size: .65rem; letter-spacing: .12em; }
.kit-heading h2, .signal-header h2, .component-copy h2 {
  margin: 0;
  font-size: clamp(2.75rem, 5vw, 5rem);
  line-height: 1.02;
  letter-spacing: -.055em;
  font-weight: 500;
}
.kit-summary { margin: 0; color: rgba(236, 247, 255, .58); font-size: .97rem; line-height: 1.78; }
.kit-gallery { margin-top: 72px; display: grid; grid-template-columns: minmax(0, 1fr) 122px; gap: 14px; }
.kit-stage { position: relative; aspect-ratio: 16 / 9; overflow: hidden; border: 1px solid var(--line-dark); background: #f4f3f0; }
.kit-stage::after { content: ''; position: absolute; inset: 0; box-shadow: inset 0 0 60px rgba(4, 7, 13, .08); pointer-events: none; }
.kit-stage img { width: 100%; height: 100%; object-fit: contain; transition: opacity .22s ease, transform .22s ease; }
.kit-stage.is-changing img { opacity: .25; transform: scale(.985); }
.kit-badge { position: absolute; z-index: 2; top: 26px; left: 27px; width: 72px; height: 72px; padding: 10px; display: flex; flex-direction: column; justify-content: space-between; border: 1px solid rgba(255,255,255,.23); background: rgba(5,7,13,.62); backdrop-filter: blur(10px); font-family: var(--font-mono); }
.kit-badge span { color: var(--cyan); font-size: .54rem; letter-spacing: .13em; }
.kit-badge strong { font-size: 1.35rem; font-weight: 400; }
.kit-view-label { position: absolute; z-index: 2; right: 18px; bottom: 16px; margin: 0; padding: 8px 11px; color: rgba(245,251,255,.78); background: rgba(5,7,13,.68); backdrop-filter: blur(10px); font-family: var(--font-mono); font-size: .55rem; letter-spacing: .08em; text-transform: uppercase; }
.kit-thumbnails { display: grid; gap: 12px; align-content: start; }
.kit-thumb { padding: 0; overflow: hidden; color: rgba(236,247,255,.58); border: 1px solid var(--line-dark); background: #111722; cursor: pointer; text-align: left; transition: border-color .2s ease, color .2s ease, transform .2s ease; }
.kit-thumb:hover { color: var(--white); border-color: rgba(255,255,255,.34); transform: translateX(-2px); }
.kit-thumb.active { color: var(--white); border-color: var(--cyan); box-shadow: 0 0 0 1px rgba(80,221,255,.2), 0 0 24px rgba(80,221,255,.09); }
.kit-thumb:focus-visible { outline: 2px solid var(--white); outline-offset: 3px; }
.kit-thumb img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: #f4f3f0; }
.kit-thumb span { display: block; padding: 9px 10px 10px; font-family: var(--font-mono); font-size: .52rem; letter-spacing: .06em; text-transform: uppercase; }
.kit-details { margin-top: 95px; display: grid; grid-template-columns: .7fr 1.3fr; gap: 12%; }
.spectral-line { display: block; width: 92px; height: 2px; margin-bottom: 35px; background: var(--spectrum); box-shadow: 0 0 22px rgba(80,221,255,.4); }
.kit-statement p { margin: 0; color: rgba(236,247,255,.48); font-size: clamp(1.55rem, 2.5vw, 2.25rem); line-height: 1.45; letter-spacing: -.035em; }
.kit-statement strong { color: var(--white); font-weight: 500; }
.detail-row { padding: 30px 0; border-top: 1px solid var(--line-dark); }
.detail-row:last-child { border-bottom: 1px solid var(--line-dark); }
.detail-row h3 { margin: 0 0 10px; font-size: 1.1rem; font-weight: 600; }
.detail-row p { margin: 0; color: rgba(236,247,255,.5); font-size: .86rem; line-height: 1.75; }
.kit-components { margin-top: 64px; padding: 32px 0; display: flex; align-items: center; gap: 24px; border-block: 1px solid var(--line-dark); }
.kit-components-icon { width: 42px; height: 42px; flex: 0 0 42px; color: rgba(236,247,255,.72); }
.kit-components h3 { margin: 0 0 10px; font-size: 1.1rem; font-weight: 600; }
.kit-components h3 span { display: inline-block; color: rgba(236,247,255,.65); font-size: .86rem; font-weight: 400; }
.kit-components p { margin: 0; color: rgba(236,247,255,.65); font-size: .86rem; line-height: 1.75; }
.kit-components > div { flex: 1; min-width: 0; }
.kit-waitlist { flex-shrink: 0; margin-left: auto; }
.kit-waitlist:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; }
.kit-use-cases { margin-top: 95px; }
.kit-use-cases-heading { max-width: 660px; }
.kit-use-cases h3 { margin: 0; font-size: clamp(2rem, 3.5vw, 3rem); font-weight: 500; line-height: 1.15; letter-spacing: -.045em; }
.kit-use-cases-intro { margin: 20px 0 0; color: rgba(236,247,255,.65); font-size: .94rem; line-height: 1.85; }
.kit-use-cases-grid { margin-top: 40px; padding-top: 32px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; border-top: 1px solid var(--line-dark); }
.kit-use-case { max-width: 330px; }
.kit-use-case h4 { margin: 0 0 12px; font-size: 1rem; font-weight: 600; line-height: 1.5; }
.kit-use-case p { margin: 0; color: rgba(236,247,255,.65); font-size: .86rem; line-height: 1.75; }

.signal-section { background: var(--paper-bright); }
.signal-header { display: grid; grid-template-columns: 1.15fr .55fr; gap: 18%; align-items: end; }
.signal-header p { margin: 0 0 8px; color: var(--text-soft); font-size: .92rem; line-height: 1.8; }
.signal-path { position: relative; margin-top: 105px; display: grid; grid-template-columns: repeat(4, 1fr); }
.signal-beam { position: absolute; z-index: 0; top: 6px; left: 12.5%; right: 12.5%; height: 1px; background: #c9ced3; }
.signal-beam span { display: block; width: calc(var(--signal-progress) + 1px); height: 2px; transform: translateY(-1px); background: var(--spectrum); box-shadow: 0 0 17px rgba(80,221,255,.4); transition: width .45s ease; }
.signal-node { position: relative; z-index: 1; padding: 0 10px; display: flex; flex-direction: column; align-items: center; border: 0; background: transparent; cursor: pointer; }
.node-dot { width: 13px; height: 13px; margin-bottom: 26px; border: 3px solid var(--paper-bright); border-radius: 50%; background: #8c96a2; outline: 1px solid #8c96a2; transition: box-shadow .25s ease, background-color .25s ease, transform .25s ease; }
.signal-node.active .node-dot { background: var(--cyan); outline-color: var(--cyan); box-shadow: 0 0 20px 4px rgba(80,221,255,.44); transform: scale(1.18); }
.signal-node strong { font-size: .93rem; font-weight: 600; }
.signal-node small { margin-top: 6px; color: #808994; font-family: var(--font-mono); font-size: .58rem; letter-spacing: .04em; }
.signal-readout { min-height: 164px; margin-top: 72px; padding: 35px 40px; display: grid; grid-template-columns: .75fr 1.25fr; gap: 10%; align-items: center; color: var(--white); background: var(--ink-soft); }
.readout-code { color: var(--cyan); font-family: var(--font-mono); font-size: .58rem; letter-spacing: .12em; }
.signal-readout h3 { margin: 10px 0 0; font-size: 1.45rem; font-weight: 500; }
.signal-readout p { margin: 0; color: rgba(236,247,255,.56); font-size: .87rem; line-height: 1.78; }

.component-section { position: relative; overflow: hidden; color: var(--white); background: #080c14; }
.component-glow { position: absolute; width: 650px; height: 650px; right: -180px; top: -180px; border-radius: 50%; background: radial-gradient(circle, rgba(52,133,255,.15), transparent 66%); }
.component-grid { position: relative; display: grid; grid-template-columns: .9fr 1.1fr; gap: 10%; align-items: center; }
.component-copy > p:last-child { max-width: 530px; margin: 30px 0 0; color: rgba(236,247,255,.56); font-size: .94rem; line-height: 1.85; }
.component-orbit { position: relative; height: 530px; }
.orbit-ring { position: absolute; top: 50%; left: 50%; border: 1px solid rgba(135,210,255,.18); border-radius: 50%; transform: translate(-50%, -50%); }
.ring-one { width: 350px; height: 350px; }
.ring-two { width: 490px; height: 490px; border-style: dashed; animation: orbit-spin 35s linear infinite; }
.orbit-core { position: absolute; top: 50%; left: 50%; width: 174px; height: 174px; display: flex; flex-direction: column; align-items: center; justify-content: center; border: 1px solid rgba(164, 218, 255, .35); border-radius: 50%; background: radial-gradient(circle, rgba(75,178,255,.18), rgba(10,18,31,.7) 70%); transform: translate(-50%, -50%); box-shadow: 0 0 90px rgba(45,149,255,.12); }
.orbit-core span { width: 12px; height: 12px; margin-bottom: 17px; border-radius: 50%; background: white; box-shadow: 0 0 25px 8px rgba(80,221,255,.7), 0 0 60px 16px rgba(164,122,255,.23); }
.orbit-core strong { font-size: .67rem; line-height: 1.45; letter-spacing: .18em; text-align: center; }
.orbit-label { position: absolute; padding: 8px 12px; color: rgba(236,247,255,.72); border: 1px solid rgba(255,255,255,.12); background: rgba(8,12,20,.76); font-family: var(--font-mono); font-size: .56rem; letter-spacing: .1em; }
.orbit-a { left: 3%; top: 28%; }
.orbit-b { right: 0; top: 20%; }
.orbit-c { left: 8%; bottom: 20%; }
.orbit-d { right: 3%; bottom: 27%; }
@keyframes orbit-spin { to { transform: translate(-50%, -50%) rotate(360deg); } }

.get-started { background: var(--paper-bright); }
.cta-panel { position: relative; overflow: hidden; min-height: 520px; padding: 82px; color: var(--white); background: var(--ink); }
.cta-panel > *:not(.cta-spectrum) { position: relative; z-index: 1; }
.cta-panel h2 { margin: 0; max-width: 750px; font-size: clamp(3.4rem, 7vw, 7rem); line-height: .92; letter-spacing: -.067em; font-weight: 500; }
.cta-panel > p:not(.mono-label) { max-width: 550px; margin: 28px 0 34px; color: rgba(236,247,255,.55); font-size: .92rem; line-height: 1.75; }
.cta-spectrum { position: absolute; right: -6%; bottom: -45%; width: 56%; aspect-ratio: 1; border-radius: 50%; background: conic-gradient(from 190deg, transparent, rgba(80,221,255,.7), rgba(78,119,255,.54), rgba(173,90,255,.48), transparent 62%); filter: blur(22px); opacity: .62; }
.cta-spectrum::after { content: ''; position: absolute; inset: 22%; border-radius: 50%; background: var(--ink); filter: blur(6px); }

.site-footer { padding: 48px 0 28px; color: var(--white); background: var(--ink); border-top: 1px solid var(--line-dark); }
.footer-top { padding-bottom: 45px; display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; align-items: start; }
.footer-brand > p { margin: 18px 0 24px; color: rgba(236,247,255,.6); font-size: .75rem; line-height: 1.7; }
.back-top { color: rgba(236,247,255,.65); font-size: .72rem; }
.footer-links h2 { margin: 0 0 18px; color: rgba(236,247,255,.65); font-family: var(--font-mono); font-size: .72rem; font-weight: 500; letter-spacing: .08em; text-transform: uppercase; }
.footer-links ul { margin: 0; padding: 0; list-style: none; }
.footer-links a { display: inline-block; padding: 8px 0; color: rgba(236,247,255,.65); font-size: .85rem; line-height: 1.5; transition: color .2s ease; }
.footer-links a:hover, .back-top:hover { color: var(--cyan); }
.footer-links a:focus-visible, .back-top:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; }
.footer-bottom { padding-top: 24px; display: flex; justify-content: space-between; color: rgba(236,247,255,.32); border-top: 1px solid var(--line-dark); font-family: var(--font-mono); font-size: .57rem; letter-spacing: .05em; text-transform: uppercase; }
.footer-bottom p { margin: 0; }

.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s cubic-bezier(.2,.75,.25,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.principles .reveal:nth-child(2), .detail-list .reveal:nth-child(2) { transition-delay: .08s; }
.principles .reveal:nth-child(3), .detail-list .reveal:nth-child(3) { transition-delay: .16s; }

@media (max-width: 1050px) {
  .hero-copy { width: 70vw; }
  .hero-wash { background: linear-gradient(90deg, rgba(3,5,10,.97), rgba(3,5,10,.79) 54%, rgba(3,5,10,.2)); }
  .principle { padding: 25px; }
  .kit-gallery { grid-template-columns: minmax(0, 1fr) 104px; }
  .kit-details { gap: 7%; }
  .component-grid { gap: 3%; }
  .component-orbit { transform: scale(.88); }
}

@media (max-width: 780px) {
  :root { --shell: calc(100vw - 32px); }
  .site-nav { background: rgba(5,7,13,.72); backdrop-filter: blur(14px); }
  body.menu-open .site-nav { background: var(--ink); }
  .nav-inner { height: 68px; }
  .nav-inner > .brand { position: relative; z-index: 3; }
  .nav-toggle { position: relative; z-index: 3; width: 42px; height: 42px; padding: 0; display: block; flex: 0 0 42px; }
  .nav-toggle span { position: absolute; left: 9px; width: 24px; height: 1px; background: var(--white); transition: transform .25s ease, top .25s ease; }
  .nav-toggle span:first-child { top: 16px; }
  .nav-toggle span:last-child { top: 24px; }
  .nav-toggle[aria-expanded="true"] span:first-child { top: 20px; transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:last-child { top: 20px; transform: rotate(-45deg); }
  .nav-links { position: fixed; z-index: 2; inset: 0; height: 100vh; height: 100dvh; overflow-y: auto; overscroll-behavior: contain; padding: 120px 24px 40px; display: flex; flex-direction: column; align-items: flex-start; gap: 10px; background: var(--ink); visibility: hidden; opacity: 0; transform: translateY(-12px); transition: opacity .25s ease, transform .25s ease, visibility .25s; }
  .nav-links.open { visibility: visible; opacity: 1; transform: translateY(0); }
  .nav-links a { width: 100%; flex-shrink: 0; padding: 14px 0; font-size: 1.5rem; border-bottom: 1px solid var(--line-dark); }
  .nav-cta { margin-top: 18px; width: auto !important; padding: 13px 20px !important; font-size: .85rem !important; }
  .hero { min-height: 820px; }
  .hero-image { background-position: 62% center; }
  .hero-wash { background: linear-gradient(90deg, rgba(3,5,10,.95), rgba(3,5,10,.65)), linear-gradient(0deg, rgba(3,5,10,.82), transparent 55%); }
  .hero-copy { width: 100%; padding-top: 45px; }
  .hero h1 { font-size: clamp(3.1rem, 12vw, 5.3rem); }
  .hero-lede { max-width: 540px; font-size: .95rem; }
  .scroll-cue { display: none; }
  .section { padding: 92px 0; }
  .section-kicker { margin-bottom: 40px; }
  .intro-layout, .kit-heading, .signal-header, .kit-details, .component-grid { grid-template-columns: 1fr; gap: 38px; }
  .display-copy, .kit-heading h2, .signal-header h2, .component-copy h2 { font-size: clamp(2.55rem, 9vw, 4rem); }
  .principles { margin-top: 65px; grid-template-columns: 1fr; }
  .principle, .principle:first-child { min-height: auto; padding: 30px 5px; border-right: 0; border-left: 0; border-bottom: 1px solid var(--line); }
  .principle:last-child { border-bottom: 0; }
  .principle-image { width: 100%; height: auto; margin: 25px 0 23px; border: 1px solid var(--line); }
  .kit-gallery { margin-top: 50px; grid-template-columns: 1fr; }
  .kit-thumbnails { grid-template-columns: repeat(3, 1fr); }
  .kit-thumb:hover { transform: translateY(-2px); }
  .kit-thumb img { aspect-ratio: 16 / 9; }
  .callout-one { right: 4%; top: 14%; }
  .callout-two { left: 4%; bottom: 7%; }
  .kit-details { margin-top: 64px; }
  .kit-use-cases { margin-top: 64px; }
  .kit-use-cases-grid { grid-template-columns: 1fr; gap: 28px; }
  .kit-components { flex-wrap: wrap; }
  .kit-waitlist { flex-basis: 100%; margin-left: 0; }
  .signal-path { margin-top: 70px; grid-template-columns: 1fr; gap: 0; }
  .signal-beam { top: 0; bottom: 0; left: 23px; right: auto; width: 1px; height: auto; }
  .signal-beam span { width: 2px; height: 1px; }
  .signal-node { min-height: 90px; padding: 0 0 0 58px; align-items: flex-start; justify-content: center; }
  .node-dot { position: absolute; left: 17px; top: calc(50% - 6px); margin: 0; }
  .signal-node small { margin: 0; }
  .signal-readout { margin-top: 40px; padding: 28px; grid-template-columns: 1fr; gap: 24px; }
  .component-orbit { height: 470px; transform: scale(.9); }
  .cta-panel { min-height: 500px; padding: 62px 36px; }
  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 520px) {
  .brand { font-size: .72rem; }
  .brand-mark-image { width: 38px; height: 38px; }
  .hero { min-height: 760px; }
  .hero-image { background-position: 67% center; opacity: .72; }
  .hero-wash { background: linear-gradient(90deg, rgba(3,5,10,.93), rgba(3,5,10,.52)), linear-gradient(0deg, rgba(3,5,10,.84), transparent 48%); }
  .hero h1 { font-size: clamp(2.65rem, 11.5vw, 4.1rem); }
  .hero-lede { margin-top: 24px; line-height: 1.65; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .hero-notes { margin-top: 30px; gap: 9px 17px; flex-wrap: wrap; font-size: .54rem; }
  .section { padding: 74px 0; }
  .kit-stage { aspect-ratio: 4 / 3; }
  .kit-badge { top: 16px; left: 16px; }
  .kit-view-label { right: 12px; bottom: 11px; }
  .kit-thumbnails { gap: 8px; }
  .kit-thumb span { padding: 7px 8px 8px; font-size: .47rem; }
  .component-orbit { height: 380px; transform: scale(.82); margin: -25px -50px; }
  .cta-panel { min-height: 470px; padding: 48px 24px; }
  .cta-panel h2 { font-size: clamp(3rem, 15vw, 4.4rem); }
  .footer-bottom { align-items: flex-start; flex-direction: column; gap: 12px; line-height: 1.6; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}