:root {
  color-scheme: light;
  --lk-paper: #f6f2ea;
  --lk-paper-deep: #efe9dd;
  --lk-porcelain: #fffdf8;
  --lk-ink: #151515;
  --lk-graphite: #4e5561;
  --lk-muted: #87877d;
  --lk-rule: #ded7c8;
  --lk-rule-strong: #c5bba9;
  --lk-field: #e9e2d5;
  --lk-green: #087a58;
  --lk-green-bright: #10a978;
  --lk-carbon: #1a1a18;
  --lk-shadow: 0 24px 90px rgba(35, 31, 24, .14);
  --lk-shadow-lift: 0 40px 120px rgba(35, 31, 24, .22);
  --lk-radius: 9px;
  --lk-radius-lg: 16px;
  --lk-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --lk-display: "Space Grotesk", var(--lk-sans);
  --lk-mono: "Space Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --ease: cubic-bezier(.22, 1, .36, 1);
  font-family: var(--lk-sans);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  padding-bottom: 86px;
  color: var(--lk-ink);
  background:
    radial-gradient(120% 80% at 80% -10%, rgba(16, 169, 120, .05), transparent 60%),
    linear-gradient(90deg, rgba(21, 21, 21, .028) 1px, transparent 1px) 0 0 / 76px 76px,
    linear-gradient(0deg, rgba(21, 21, 21, .022) 1px, transparent 1px) 0 0 / 76px 76px,
    var(--lk-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; height: auto; }
h1, h2, h3, p { margin-top: 0; }

/* Film grain overlay — tactile, not glow */
.grain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: .42;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.55'/%3E%3C/svg%3E");
}

/* ---------- Reveal initial states (only when JS present) ---------- */
.has-motion [data-reveal],
.has-motion [data-reveal-item],
.has-motion [data-split] { opacity: 0; }
.has-motion.motion-ready [data-reveal],
.has-motion.motion-ready [data-reveal-item],
.has-motion.motion-ready [data-split] {
  opacity: 1;
  transition: opacity .7s var(--ease);
}

/* Word-split reveal mask */
[data-split] .word { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: .08em; margin-bottom: -.08em; }
[data-split] .word > span { display: inline-block; will-change: transform; }

/* ---------- Header ---------- */
.site-header {
  position: relative;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px clamp(18px, 4vw, 56px);
  border-bottom: 1px solid var(--lk-rule);
}
.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 33px;
  height: 33px;
  border-radius: 8px;
  color: #fff;
  background: var(--lk-ink);
  font-family: var(--lk-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .02em;
  transition: transform .5s var(--ease);
}
.brand:hover .brand-mark { transform: rotate(-8deg); }
.brand-name { font-family: var(--lk-display); font-weight: 600; font-size: 16px; letter-spacing: -.01em; }
.brand-name em { font-style: normal; color: var(--lk-muted); margin-left: .3ch; }
.header-cta {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 18px;
  border-radius: 8px;
  color: #fff;
  background: var(--lk-ink);
  font-size: 14px;
  font-weight: 600;
  will-change: transform;
  transition: background .3s var(--ease);
}
.header-cta:hover { background: #000; }

/* ---------- Shared width ---------- */
.hero, .quick-spec, .problem-band, .mechanism-demo, .use-case-gallery, .kickstarter-kit, .offer, .faq, .final-cta, .footer {
  width: min(1220px, calc(100% - 40px));
  margin-inline: auto;
}

/* ---------- Typography primitives ---------- */
.eyebrow, .overline {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 20px;
  color: var(--lk-green);
  font-family: var(--lk-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.eyebrow-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--lk-green-bright);
  box-shadow: 0 0 0 0 rgba(16, 169, 120, .5);
  animation: pulse 2.6s var(--ease) infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(16, 169, 120, .45); }
  70% { box-shadow: 0 0 0 8px rgba(16, 169, 120, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 169, 120, 0); }
}
h1 {
  max-width: 13ch;
  margin-bottom: 26px;
  font-family: var(--lk-display);
  font-size: clamp(46px, 7.4vw, 100px);
  line-height: .96;
  font-weight: 600;
  letter-spacing: -.04em;
  text-wrap: balance;
}
h2 {
  margin-bottom: 18px;
  font-family: var(--lk-display);
  font-size: clamp(33px, 4.7vw, 64px);
  line-height: 1.0;
  font-weight: 600;
  letter-spacing: -.034em;
  text-wrap: balance;
}
h3 { margin-bottom: 8px; font-family: var(--lk-display); font-size: 23px; line-height: 1.1; font-weight: 600; letter-spacing: -.02em; }
p { color: var(--lk-graphite); font-size: 17px; line-height: 1.62; }
.hero-lede { max-width: 35rem; margin-bottom: 30px; font-size: clamp(18px, 1.7vw, 21px); color: #3c4250; }
.section-heading { max-width: 800px; margin-bottom: clamp(26px, 4vw, 44px); }

/* ---------- Lead form ---------- */
.lead-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  width: min(100%, 540px);
}
.lead-form input {
  min-height: 56px;
  width: 100%;
  padding: 0 18px;
  border: 1px solid var(--lk-rule-strong);
  border-radius: var(--lk-radius);
  color: var(--lk-ink);
  background: #fff;
  font: inherit;
  transition: box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.lead-form input:focus { outline: none; border-color: transparent; box-shadow: 0 0 0 3px rgba(16, 169, 120, .4); }
.lead-form button {
  min-height: 56px;
  padding: 0 26px;
  border: 0;
  border-radius: var(--lk-radius);
  color: #fff;
  background: var(--lk-ink);
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  white-space: nowrap;
  will-change: transform;
  transition: background .3s var(--ease);
}
.lead-form button:hover { background: #000; }
.lead-form button[disabled] { opacity: .62; cursor: wait; }
.form-note { grid-column: 1 / -1; margin: 4px 0 0; color: var(--lk-muted); font-size: 13px; line-height: 1.4; }
.form-note.is-success { color: var(--lk-green); font-weight: 700; }
.form-note.is-error { color: #c0392b; }
.trap { position: absolute !important; left: -9999px !important; }

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
  gap: clamp(34px, 5.5vw, 88px);
  align-items: center;
  min-height: calc(100vh - 84px);
  padding: clamp(46px, 6.5vw, 90px) 0;
}
.hero-board {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--lk-rule-strong);
  border-radius: var(--lk-radius-lg);
  background: var(--lk-rule);
  box-shadow: var(--lk-shadow);
  transform-style: preserve-3d;
  will-change: transform;
  transition: box-shadow .5s var(--ease);
}
.hero-board:hover { box-shadow: var(--lk-shadow-lift); }
.hero-photo { position: relative; margin: 0; overflow: hidden; background: var(--lk-field); }
.hero-photo img { height: 100%; min-height: 600px; object-fit: cover; transform: scale(1.06); }
.hero-photo figcaption {
  position: absolute;
  left: 16px; right: 16px; bottom: 16px;
  padding: 13px 15px;
  border-radius: var(--lk-radius);
  color: #fff;
  background: rgba(21, 21, 21, .68);
  backdrop-filter: blur(6px);
  font-size: 14px;
  line-height: 1.38;
}
.demo-rail { display: grid; background: var(--lk-porcelain); }
.demo-rail article {
  display: grid;
  align-content: end;
  gap: 8px;
  min-height: 200px;
  padding: 22px;
  border-bottom: 1px solid var(--lk-rule);
  transition: background .35s var(--ease);
}
.demo-rail article:last-child { border-bottom: 0; }
.demo-rail article:hover { background: var(--lk-paper); }
.demo-rail span { color: var(--lk-green); font-family: var(--lk-mono); font-size: 12px; letter-spacing: .04em; }
.demo-rail strong { font-family: var(--lk-display); font-size: 22px; font-weight: 600; line-height: 1; letter-spacing: -.02em; }
.demo-rail p { margin: 0; color: var(--lk-graphite); font-size: 14px; line-height: 1.45; }

/* ---------- Quick-spec band (slim, one glance) ---------- */
.quick-spec {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 24px;
  margin-top: clamp(6px, 1.6vw, 16px);
  padding: 16px clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--lk-rule);
  border-radius: var(--lk-radius-lg);
  background: rgba(255, 253, 248, .72);
}
.quick-spec-lead {
  font-family: var(--lk-display);
  font-size: clamp(16px, 1.7vw, 20px);
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--lk-ink);
}
.quick-spec-list {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 10px;
  margin: 0 0 0 auto;
  padding: 0;
  list-style: none;
}
.quick-spec-list li {
  padding: 7px 16px;
  border: 1px solid var(--lk-rule-strong);
  border-radius: 999px;
  background: var(--lk-porcelain);
  color: var(--lk-ink);
  font-family: var(--lk-mono);
  font-size: 13px;
  letter-spacing: .02em;
}

/* ---------- Problem band ---------- */
.problem-band {
  display: grid;
  grid-template-columns: 1fr .72fr;
  gap: clamp(28px, 5vw, 72px);
  padding: clamp(74px, 10vw, 140px) 0;
  border-bottom: 1px solid var(--lk-rule);
}
.problem-band > p { align-self: end; margin-bottom: 0; font-size: clamp(18px, 1.8vw, 22px); }

/* ---------- Mechanism ---------- */
.mechanism-demo { padding: clamp(64px, 9vw, 118px) 0; }
.mechanism-demo ol {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  overflow: hidden;
  margin: 0;
  padding: 0;
  border: 1px solid var(--lk-rule);
  border-radius: var(--lk-radius-lg);
  background: var(--lk-rule);
  list-style: none;
}
.mechanism-demo li {
  min-height: 282px;
  padding: clamp(22px, 2.5vw, 30px);
  background: var(--lk-porcelain);
  transition: background .4s var(--ease);
}
.mechanism-demo li:hover { background: var(--lk-paper); }
.mechanism-demo span {
  display: block;
  margin-bottom: 70px;
  color: var(--lk-green);
  font-family: var(--lk-mono);
  font-size: 13px;
}
.mechanism-demo strong { display: block; margin-bottom: 8px; font-family: var(--lk-display); font-size: 22px; font-weight: 600; letter-spacing: -.02em; }
.mechanism-demo p { margin: 0; font-size: 15px; }

/* ---------- Use-case gallery ---------- */
.use-case-gallery {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 16px;
  padding: clamp(50px, 8vw, 104px) 0;
}
.use-case-gallery .section-heading { grid-column: 1 / -1; }
.use-case-gallery figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--lk-rule);
  border-radius: var(--lk-radius-lg);
  background: var(--lk-field);
  box-shadow: var(--lk-shadow);
}
.use-case-gallery figure.large { grid-row: span 2; min-height: 660px; }
.use-case-gallery figure:not(.large) { min-height: 322px; }
.use-case-gallery img { height: 100%; object-fit: cover; transform: scale(1.06); }
.use-case-gallery figcaption {
  position: absolute;
  left: 14px; right: 14px; bottom: 14px;
  padding: 12px 14px;
  border-radius: var(--lk-radius);
  color: #fff;
  background: rgba(21, 21, 21, .68);
  backdrop-filter: blur(6px);
  font-size: 13px;
  line-height: 1.4;
}

/* ---------- Kickstarter kit ---------- */
.kickstarter-kit {
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  gap: clamp(30px, 5vw, 76px);
  align-items: center;
  padding: clamp(72px, 10vw, 132px) 0;
  border-top: 1px solid var(--lk-rule);
}
.kickstarter-kit figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--lk-rule);
  border-radius: var(--lk-radius-lg);
  background: var(--lk-field);
  box-shadow: var(--lk-shadow);
}
.kickstarter-kit img { aspect-ratio: 1; object-fit: cover; transform: scale(1.06); }
.kickstarter-kit dl {
  display: grid;
  gap: 1px;
  overflow: hidden;
  margin: 28px 0 0;
  border: 1px solid var(--lk-rule);
  border-radius: var(--lk-radius-lg);
  background: var(--lk-rule);
}
.kickstarter-kit dl > div {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 18px;
  padding: 20px;
  background: var(--lk-porcelain);
  transition: background .35s var(--ease);
}
.kickstarter-kit dl > div:hover { background: var(--lk-paper); }
.kickstarter-kit dt { color: var(--lk-green); font-family: var(--lk-mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.kickstarter-kit dd { margin: 0; color: var(--lk-graphite); line-height: 1.5; }

/* ---------- Offer (dark band) ---------- */
.offer {
  position: relative;
  margin-top: clamp(40px, 6vw, 80px);
  padding: clamp(48px, 6vw, 84px);
  border-radius: var(--lk-radius-lg);
  background: var(--lk-carbon);
  overflow: hidden;
}
.offer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(255, 255, 255, .03) 1px, transparent 1px),
    linear-gradient(0deg, rgba(255, 255, 255, .03) 1px, transparent 1px);
  background-size: 76px 76px;
  pointer-events: none;
}
.offer-inner { position: relative; max-width: 820px; }
.offer .overline { color: #7be1bd; }
.offer h2 { color: #fff; }
.offer p { max-width: 740px; color: rgba(255, 255, 255, .68); }
.button-light {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
  min-height: 56px;
  margin-top: 26px;
  padding: 0 26px;
  border-radius: var(--lk-radius);
  color: #fff;
  background: var(--lk-green);
  font-weight: 600;
  font-size: 16px;
  will-change: transform;
  transition: background .3s var(--ease);
}
.button-light:hover { background: var(--lk-green-bright); }
.button-arrow { transition: transform .4s var(--ease); }
.button-light:hover .button-arrow { transform: translateX(4px); }

/* ---------- FAQ ---------- */
.faq { padding: clamp(66px, 9vw, 120px) 0; }
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.faq details {
  padding: 3px 20px;
  border: 1px solid var(--lk-rule);
  border-radius: 12px;
  background: var(--lk-porcelain);
  transition: border-color .35s var(--ease), background .35s var(--ease);
}
.faq details[open] { border-color: var(--lk-rule-strong); }
.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  color: var(--lk-ink);
  font-family: var(--lk-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -.01em;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--lk-green); font-size: 24px; font-weight: 400; transition: transform .35s var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin-bottom: 20px; font-size: 15px; }

/* ---------- Final CTA ---------- */
.final-cta {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: clamp(24px, 5vw, 72px);
  align-items: end;
  margin: clamp(40px, 6vw, 80px) auto clamp(70px, 10vw, 130px);
  padding: clamp(48px, 6vw, 84px);
  border-radius: var(--lk-radius-lg);
  border: 1px solid var(--lk-rule-strong);
  background:
    radial-gradient(120% 120% at 100% 0%, rgba(16, 169, 120, .12), transparent 55%),
    var(--lk-porcelain);
}
.final-cta .lead-form { justify-self: end; }

/* ---------- Sticky lead ---------- */
.sticky-lead {
  position: fixed;
  left: 50%;
  bottom: 14px;
  z-index: 50;
  transform: translate(-50%, 120%);
  display: flex;
  align-items: center;
  gap: 14px;
  width: min(720px, calc(100% - 24px));
  padding: 12px 14px;
  border: 1px solid var(--lk-rule);
  border-radius: 14px;
  background: rgba(255, 253, 248, .94);
  backdrop-filter: blur(8px);
  box-shadow: var(--lk-shadow);
  opacity: 0;
  pointer-events: none;
  transition: transform .35s var(--ease), opacity .35s var(--ease);
}
.sticky-lead.is-visible { transform: translateX(-50%); opacity: 1; pointer-events: auto; }
.sticky-label { flex: 1; margin: 0; color: var(--lk-ink); font-size: 14px; font-weight: 600; line-height: 1.3; }
.sticky-form { grid-template-columns: minmax(0, 1fr) auto; width: min(420px, 62%); }
.sticky-form input, .sticky-form button { min-height: 46px; }
.sticky-form button { background: var(--lk-green); padding: 0 16px; }
.sticky-form button:hover { background: var(--lk-green-bright); }
.sticky-form .form-note { display: none; }

/* ---------- Footer ---------- */
.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 30px 0 64px;
  border-top: 1px solid var(--lk-rule);
  color: var(--lk-muted);
  font-size: 13px;
}
.footer .brand-name { color: var(--lk-ink); }
.footer a:hover { color: var(--lk-ink); }

/* ---------- Responsive ---------- */
@media (max-width: 1020px) {
  .hero, .problem-band, .kickstarter-kit, .final-cta { grid-template-columns: 1fr; }
  .hero { min-height: auto; padding-top: 44px; }
  .hero-board { grid-template-columns: 1fr; }
  .hero-photo img { min-height: auto; aspect-ratio: 4 / 3; }
  .demo-rail { grid-template-columns: repeat(3, 1fr); }
  .demo-rail article { min-height: 160px; }
  .mechanism-demo ol { grid-template-columns: repeat(2, 1fr); }
  .use-case-gallery { grid-template-columns: 1fr; }
  .use-case-gallery figure.large, .use-case-gallery figure:not(.large) { min-height: auto; aspect-ratio: 4 / 3; }
  .final-cta { align-items: start; }
  .final-cta .lead-form { justify-self: start; }
}

@media (max-width: 640px) {
  body { padding-bottom: 78px; }
  .hero, .quick-spec, .problem-band, .mechanism-demo, .use-case-gallery, .kickstarter-kit, .offer, .faq, .final-cta, .footer {
    width: min(100% - 28px, 1220px);
  }
  .site-header { padding: 14px; }
  .header-cta { min-height: 38px; padding: 0 13px; font-size: 13px; }
  .hero { padding-top: 34px; }
  .hero-board { order: -1; }
  h1 { font-size: clamp(44px, 13vw, 64px); }
  h2 { font-size: clamp(32px, 10vw, 44px); }
  .lead-form, .demo-rail, .mechanism-demo ol, .faq-grid { grid-template-columns: 1fr; }
  .lead-form button { width: 100%; }
  .demo-rail article, .mechanism-demo li { min-height: auto; }
  .mechanism-demo span { margin-bottom: 22px; }
  .quick-spec { gap: 10px 16px; }
  .quick-spec-list { margin-left: 0; }
  .kickstarter-kit dl > div { grid-template-columns: 1fr; gap: 6px; }
  .sticky-lead {
    left: 0;
    bottom: 0;
    width: 100%;
    gap: 10px;
    padding: 10px 12px calc(10px + env(safe-area-inset-bottom));
    border-radius: 16px 16px 0 0;
    transform: translateY(120%);
  }
  .sticky-lead.is-visible { transform: translateY(0); }
  .sticky-label { display: none; }
  .sticky-form { width: 100%; flex: 1; }
  .footer { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation-duration: 1ms !important; animation-iteration-count: 1 !important; }
  .has-motion [data-reveal],
  .has-motion [data-reveal-item],
  .has-motion [data-split] { opacity: 1 !important; }
}