:root {
  --ink: #0a100f;
  --ink-2: #111a18;
  --cream: #f1eee5;
  --paper: #f8f6ef;
  --lime: #d9ff43;
  --yellow: #f7b32b;
  --rust: #bd3f28;
  --muted: #9ca49f;
  --line: rgba(10, 16, 15, .15);
  --shell: min(1240px, calc(100vw - 64px));
  --sans: "DM Sans", sans-serif;
  --display: "Manrope", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  line-height: 1.5;
  overflow-x: hidden;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { color: inherit; }
::selection { color: var(--ink); background: var(--lime); }
.skip {
  position: fixed; z-index: 1000; top: 12px; left: 12px;
  padding: 10px 16px; background: white; transform: translateY(-150%);
}
.skip:focus { transform: none; }
.shell { width: var(--shell); margin-inline: auto; }

.progress { position: fixed; z-index: 1001; top: 0; left: 0; width: 100%; height: 2px; }
.progress span { display: block; width: 0; height: 100%; background: var(--lime); }
.site-header {
  position: fixed; z-index: 100; top: 0; left: 0; right: 0;
  height: 88px; padding: 0 32px; display: flex; align-items: center;
  color: white; border-bottom: 1px solid rgba(255,255,255,.15);
  transition: background .35s, height .35s, color .35s;
}
.site-header.scrolled {
  height: 72px; color: var(--ink); background: rgba(248,246,239,.88);
  backdrop-filter: blur(18px); border-color: var(--line);
}
.brand { display: flex; align-items: center; gap: 13px; margin-right: auto; }
.brand-mark { width: 39px; height: 39px; filter: drop-shadow(0 6px 12px rgba(0,0,0,.14)); }
.brand strong {
  display: block; font-family: var(--display); font-size: 18px;
  letter-spacing: -.02em; line-height: 1;
}
.brand small {
  display: block; margin-top: 4px; color: rgba(255,255,255,.55);
  font-size: 8px; line-height: 1.25; letter-spacing: .12em; text-transform: uppercase;
}
.scrolled .brand small { color: #67706c; }
.desktop-nav { display: flex; gap: 4px; }
.desktop-nav a {
  position: relative; padding: 12px 16px; font-size: 13px; font-weight: 600;
}
.desktop-nav a::after {
  content: ""; position: absolute; bottom: 5px; left: 16px; right: 16px; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: left; transition: transform .25s;
}
.desktop-nav a:hover::after { transform: scaleX(1); }
.header-cta {
  display: flex; gap: 20px; align-items: center; margin-left: 18px; padding: 12px 16px;
  border: 1px solid currentColor; font-size: 13px; font-weight: 700;
}
.header-cta span { transition: transform .25s; }
.header-cta:hover span { transform: translate(3px,-3px); }
.menu-toggle { display: none; border: 0; background: none; width: 44px; height: 44px; }
.menu-toggle span { display: block; width: 24px; height: 1px; margin: 6px auto; background: currentColor; transition: transform .3s; }
.mobile-menu {
  position: fixed; z-index: 90; inset: 0; display: grid; place-items: center;
  visibility: hidden; opacity: 0; background: var(--paper); transition: .3s;
}
.mobile-menu.open { visibility: visible; opacity: 1; }
.mobile-menu nav { width: min(480px, calc(100vw - 48px)); }
.mobile-menu a {
  display: flex; align-items: baseline; gap: 20px; padding: 18px 0;
  border-bottom: 1px solid var(--line); font: 700 clamp(26px,8vw,42px)/1 var(--display);
}
.mobile-menu a span { color: var(--rust); font: 500 10px/1 var(--sans); letter-spacing: .15em; }

.hero {
  position: relative; min-height: 100svh; color: white; background: var(--ink);
  overflow: hidden; isolation: isolate;
}
.hero-video { position: absolute; z-index: -4; inset: 0; width: 100%; height: 100%; object-fit: cover; filter: saturate(.7) contrast(1.08); }
.hero-wash {
  position: absolute; z-index: -3; inset: 0;
  background:
    radial-gradient(circle at 73% 35%, transparent 0 20%, rgba(4,9,8,.14) 52%),
    linear-gradient(90deg, rgba(5,11,10,.9) 0%, rgba(5,11,10,.58) 49%, rgba(5,11,10,.16) 78%),
    linear-gradient(0deg, rgba(5,11,10,.75), transparent 45%);
}
.hero-grid {
  position: absolute; z-index: -2; inset: 0; opacity: .17;
  background-image: linear-gradient(rgba(255,255,255,.14) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.14) 1px, transparent 1px);
  background-size: 96px 96px;
  mask-image: linear-gradient(90deg, black, transparent 65%);
}
.hero-content {
  width: var(--shell); margin: 0 auto; padding: clamp(160px, 21vh, 230px) 0 220px;
}
.kicker, .eyebrow {
  display: flex; align-items: center; gap: 13px; margin-bottom: 24px;
  color: var(--lime); font-size: 10px; font-weight: 700; letter-spacing: .2em; text-transform: uppercase;
}
.kicker span { width: 32px; height: 1px; background: currentColor; }
.hero h1 {
  margin: 0; max-width: 900px; font: 700 clamp(56px, 8.4vw, 126px)/.86 var(--display);
  letter-spacing: -.075em;
}
.hero h1 em { color: var(--lime); font-style: normal; }
.hero-copy {
  max-width: 610px; margin: 38px 0 0; color: rgba(255,255,255,.7);
  font-size: clamp(17px, 1.6vw, 21px); line-height: 1.65;
}
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 42px; }
.button {
  display: inline-flex; align-items: center; justify-content: space-between; gap: 54px;
  min-width: 210px; padding: 17px 20px; font-size: 13px; font-weight: 700; transition: .25s;
}
.button-primary { color: var(--ink); background: var(--lime); }
.button-primary:hover { background: white; transform: translateY(-2px); }
.button span { font-size: 17px; }
.video-control {
  display: flex; align-items: center; gap: 10px; padding: 10px; color: white;
  border: 0; background: none; cursor: pointer; font-size: 12px;
}
.pause-icon { display: grid; place-items: center; width: 32px; height: 32px; border: 1px solid rgba(255,255,255,.45); border-radius: 50%; font-size: 10px; }
.hero-telemetry {
  position: absolute; bottom: 0; left: 0; right: 0; display: grid; grid-template-columns: repeat(3,1fr);
  padding-left: max(32px, calc((100vw - 1240px)/2)); padding-right: max(32px, calc((100vw - 1240px)/2));
  border-top: 1px solid rgba(255,255,255,.15); background: rgba(5,10,9,.52); backdrop-filter: blur(12px);
}
.hero-telemetry div { padding: 24px 0; border-right: 1px solid rgba(255,255,255,.15); }
.hero-telemetry div + div { padding-left: 32px; }
.hero-telemetry small { display: block; color: rgba(255,255,255,.5); font-size: 9px; letter-spacing: .15em; text-transform: uppercase; }
.hero-telemetry strong { display: block; margin-top: 4px; font: 700 27px/1 var(--display); }
.hero-status {
  position: absolute; top: 116px; right: 32px; display: flex; align-items: center; gap: 8px;
  font-size: 9px; letter-spacing: .15em; text-transform: uppercase;
}
.hero-status i { width: 7px; height: 7px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 5px rgba(217,255,67,.12); }

.statement { display: grid; grid-template-columns: 1fr 3fr; gap: 50px; padding-block: 140px; }
.section-index { padding-top: 9px; color: #6e7772; font-size: 9px; font-weight: 700; letter-spacing: .18em; }
.section-index.light { color: rgba(255,255,255,.46); }
.eyebrow { color: var(--rust); }
.eyebrow.light { color: var(--lime); }
.statement-copy { max-width: 900px; }
.statement h2, .section-heading h2, .field h2, .contact h2 {
  margin: 0; font: 700 clamp(43px, 6vw, 80px)/.98 var(--display); letter-spacing: -.06em;
}
.statement .large-copy {
  max-width: 800px; margin: 42px 0 0; color: #5f6864; font-size: clamp(18px,2vw,25px); line-height: 1.55;
}

.evidence { padding-block: 130px; color: white; background: var(--ink); }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 60px; margin-bottom: 66px; }
.section-heading > p { max-width: 440px; margin: 0; color: #9aa39f; font-size: 16px; line-height: 1.75; }
.section-heading h2 { margin-top: 18px; }
.section-heading.dark { color: var(--ink); }
.section-heading.dark > p { color: #626b67; }
.metric-grid { display: grid; grid-template-columns: repeat(3,1fr); border-top: 1px solid rgba(255,255,255,.2); }
.metric { min-height: 380px; padding: 28px 30px 32px 0; border-bottom: 1px solid rgba(255,255,255,.2); }
.metric + .metric { padding-left: 30px; border-left: 1px solid rgba(255,255,255,.2); }
.metric-top { display: flex; justify-content: space-between; color: #8d9792; font-size: 9px; letter-spacing: .13em; text-transform: uppercase; }
.metric-top i { color: var(--lime); font-style: normal; }
.metric > strong { display: block; margin-top: 70px; font: 700 clamp(70px,8vw,112px)/.8 var(--display); letter-spacing: -.08em; }
.metric > strong sup { margin-left: 5px; color: var(--lime); font-size: .3em; letter-spacing: -.02em; vertical-align: top; }
.metric > p { max-width: 290px; margin: 46px 0 0; color: #aab2ae; font-size: 14px; }
.brake-lab {
  display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; margin-top: 90px; padding: 54px;
  color: var(--ink); background: var(--cream);
}
.micro { color: var(--rust); font-size: 9px; font-weight: 700; letter-spacing: .18em; text-transform: uppercase; }
.lab-copy h3, .layer-detail h3 { margin: 14px 0 18px; font: 700 clamp(29px,3vw,42px)/1.05 var(--display); letter-spacing: -.045em; }
.lab-copy p { color: #626b67; }
.lab-copy label { display: flex; justify-content: space-between; margin-top: 38px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .12em; }
.lab-copy output { color: var(--rust); }
input[type=range] { appearance: none; width: 100%; height: 3px; margin-top: 18px; background: linear-gradient(90deg, var(--rust) var(--fill,62.5%), #c9c7be var(--fill,62.5%)); }
input[type=range]::-webkit-slider-thumb { appearance: none; width: 21px; height: 21px; border: 5px solid var(--rust); border-radius: 50%; background: white; cursor: grab; }
.brake-visual { display: flex; flex-direction: column; justify-content: center; gap: 40px; }
.road-meta { display: flex; justify-content: space-between; margin-bottom: 10px; font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.road-meta strong { color: #65706b; }
.road-row.hf .road-meta strong { color: var(--rust); }
.road-track { position: relative; height: 52px; overflow: hidden; background: #d8d7cf; }
.road-track::after { content:""; position: absolute; top: 50%; left: 0; right: 0; border-top: 1px dashed rgba(10,16,15,.25); }
.road-row.hf .road-track { background: #e2c0b7; }
.distance-line { position: absolute; z-index: 1; left: 0; top: 0; bottom: 0; width: 40%; border-right: 2px solid var(--ink); background: linear-gradient(90deg, transparent, rgba(10,16,15,.08)); transition: width .65s cubic-bezier(.2,.8,.2,1); }
.distance-line.hf-line { border-color: var(--rust); background: linear-gradient(90deg, transparent, rgba(189,63,40,.15)); }
.car { position: absolute; z-index: 2; top: 50%; left: 40%; transform: translate(-50%,-50%) rotate(45deg); color: var(--ink); transition: left .65s cubic-bezier(.2,.8,.2,1); }
.hf-car { color: var(--rust); }
.saving { padding-top: 18px; border-top: 1px solid var(--line); color: #616965; font-size: 14px; }
.saving span { color: var(--rust); font: 700 26px/1 var(--display); }

.system, .resources { padding-block: 140px; }
.layer-explorer { display: grid; grid-template-columns: 1.2fr .8fr; gap: 70px; align-items: center; }
.layers { padding: 46px 0; background: #dde0da; perspective: 800px; }
.layer {
  position: relative; display: grid; grid-template-columns: 50px 1fr; width: calc(100% - 70px); min-height: 94px;
  margin: 0 auto; padding: 20px 24px; text-align: left; border: 0; cursor: pointer; transition: transform .4s, filter .3s;
  box-shadow: 0 12px 24px rgba(10,16,15,.12);
}
.layer:hover, .layer.active { transform: translateY(-8px) scale(1.015); filter: brightness(1.05); }
.layer + .layer { margin-top: 5px; }
.layer span { grid-row: 1/3; color: rgba(255,255,255,.55); font-size: 9px; letter-spacing: .12em; }
.layer b { color: white; font-size: 16px; }
.layer small { color: rgba(255,255,255,.55); font-size: 10px; text-transform: uppercase; letter-spacing: .1em; }
.aggregate { z-index: 3; background: radial-gradient(circle at 10% 20%, #d76c4f 0 2px, transparent 3px), radial-gradient(circle at 70% 45%, #6e1c12 0 3px, transparent 4px), #a83321; background-size: 18px 16px, 22px 20px; }
.resin { z-index: 2; background: #b89029; }
.pavement { z-index: 1; min-height: 130px; background: radial-gradient(#454e4a 1px, transparent 1.5px), #202927; background-size: 12px 12px; }
.layer-detail p { color: #606965; font-size: 16px; line-height: 1.75; }
.layer-facts { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; margin-top: 32px; background: var(--line); border: 1px solid var(--line); }
.layer-facts span { padding: 17px 12px; background: var(--paper); color: #69716e; font-size: 9px; text-transform: uppercase; letter-spacing: .08em; }
.layer-facts b { display: block; color: var(--ink); font: 700 20px/1.2 var(--display); letter-spacing: -.03em; }

.field { display: grid; grid-template-columns: 1.1fr .9fr; min-height: 800px; color: white; background: var(--ink); }
.field-image { min-height: 620px; background: linear-gradient(90deg, transparent 70%, var(--ink)), url("assets/winding-road.jpg") center/cover; filter: saturate(.7); }
.field-panel { align-self: center; max-width: 620px; padding: 90px clamp(40px,6vw,100px); }
.field-panel h2 { margin: 18px 0 28px; font-size: clamp(42px,5vw,70px); }
.field-panel > p { color: #9ca5a1; line-height: 1.75; }
.case-tabs { display: flex; margin-top: 42px; border-bottom: 1px solid rgba(255,255,255,.2); }
.case-tabs button { padding: 14px 18px; border: 0; border-bottom: 2px solid transparent; color: #78827d; background: none; cursor: pointer; font-size: 11px; }
.case-tabs button.active { color: var(--lime); border-color: var(--lime); }
.case-result { min-height: 150px; padding-top: 28px; }
.case-result strong { color: var(--lime); font: 700 56px/1 var(--display); letter-spacing: -.06em; }
.case-result span { margin-left: 12px; color: #c6cbc8; font-size: 11px; text-transform: uppercase; letter-spacing: .1em; }
.case-result p { color: #8f9994; font-size: 13px; }

.resource-list { border-top: 1px solid var(--line); }
.resource { display: grid; grid-template-columns: 60px 1.1fr 1fr 40px; gap: 26px; align-items: center; padding: 30px 10px; border-bottom: 1px solid var(--line); transition: background .25s, padding .25s; }
.resource:hover { padding-inline: 22px; background: white; }
.resource-no, .resource small { color: #7a837f; font-size: 9px; letter-spacing: .14em; text-transform: uppercase; }
.resource h3 { margin: 6px 0 0; font: 700 23px/1.2 var(--display); letter-spacing: -.03em; }
.resource p { margin: 0; color: #68716d; font-size: 13px; }
.resource i { font-size: 20px; font-style: normal; }

.contact { position: relative; overflow: hidden; padding-block: 150px; color: white; background: var(--rust); }
.contact .shell { position: relative; z-index: 1; }
.contact h2 { max-width: 900px; margin-top: 26px; font-size: clamp(54px,7.5vw,106px); }
.contact p { max-width: 580px; margin: 34px 0; color: rgba(255,255,255,.68); font-size: 18px; }
.contact .button-primary { background: var(--lime); }
.contact-orbit {
  position: absolute; width: 700px; height: 700px; right: -150px; top: -200px;
  border: 1px solid rgba(255,255,255,.23); border-radius: 50%;
}
.contact-orbit::before, .contact-orbit::after { content:""; position: absolute; inset: 90px; border: 1px solid rgba(255,255,255,.18); border-radius: inherit; }
.contact-orbit::after { inset: 210px; }

footer { padding-block: 54px; color: #858f8a; background: var(--ink); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr auto; gap: 40px; align-items: start; font-size: 11px; }
.footer-brand { color: white; }
.footer-grid > p { margin: 5px 0; }
.footer-grid > div { display: flex; flex-direction: column; gap: 7px; }
.footer-grid > div a:hover { color: white; }

.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s cubic-bezier(.2,.8,.2,1), transform .8s cubic-bezier(.2,.8,.2,1); }
.reveal.visible { opacity: 1; transform: none; }

@media (max-width: 900px) {
  :root { --shell: calc(100vw - 40px); }
  .site-header { padding-inline: 20px; }
  .desktop-nav, .header-cta { display: none; }
  .menu-toggle { display: block; }
  .site-header.menu-active { color: var(--ink); }
  .site-header.menu-active .brand small { color: #67706c; }
  .site-header.menu-active .menu-toggle span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .site-header.menu-active .menu-toggle span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .hero-content { padding-top: 180px; }
  .hero h1 { font-size: clamp(54px,15vw,88px); }
  .hero-status { display: none; }
  .statement { grid-template-columns: 1fr; padding-block: 100px; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 24px; }
  .metric-grid { grid-template-columns: 1fr; }
  .metric { min-height: 300px; }
  .metric + .metric { padding-left: 0; border-left: 0; }
  .metric > strong { margin-top: 50px; }
  .brake-lab { grid-template-columns: 1fr; gap: 50px; padding: 32px; }
  .layer-explorer { grid-template-columns: 1fr; }
  .field { grid-template-columns: 1fr; }
  .field-image { min-height: 500px; background-image: linear-gradient(0deg, var(--ink), transparent 40%), url("assets/winding-road.jpg"); }
  .field-panel { margin: -120px 0 0; padding-inline: 20px; }
  .resource { grid-template-columns: 40px 1fr 30px; }
  .resource p { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  .hero-content { padding-bottom: 260px; }
  .hero-actions { align-items: flex-start; flex-direction: column; }
  .hero-telemetry { grid-template-columns: 1fr; padding-inline: 20px; }
  .hero-telemetry div { display: flex; justify-content: space-between; align-items: center; padding: 13px 0; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.12); }
  .hero-telemetry div + div { padding-left: 0; }
  .hero-telemetry strong { font-size: 20px; }
  .statement h2, .section-heading h2 { font-size: 43px; }
  .evidence, .system, .resources { padding-block: 90px; }
  .brake-lab { margin-inline: -20px; }
  .layer { width: calc(100% - 32px); }
  .layer-facts { grid-template-columns: 1fr; }
  .case-tabs button { padding-inline: 9px; }
  .case-result span { display: block; margin: 7px 0 0; }
  .footer-grid { grid-template-columns: 1fr; }
}

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