:root {
  --ink: #344f68;
  --deep: #405f7b;
  --deep-2: #2f4a62;
  --blue: #8fafcc;
  --mid: #789bb9;
  --brand-teal: #397488;
  --brand-green: #83b6a0;
  --cloud: #b7c7d8;
  --mist: #d7e2ec;
  --silver: #e6eaee;
  --paper: #f3f7fa;
  --white: #ffffff;
  --line: rgba(52, 79, 104, 0.17);
  --max: 1200px;
  --header: 76px;
  --ease: cubic-bezier(.2, .75, .2, 1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.65;
  overflow-x: hidden;
}
body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { color: inherit; font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.skip-link { position: fixed; left: 20px; top: -70px; z-index: 999; padding: 10px 16px; background: #fff; border-radius: 8px; }
.skip-link:focus { top: 10px; }
.content-width { width: min(var(--max), calc(100% - 48px)); margin-inline: auto; }
.section { padding-top: 112px; padding-bottom: 112px; position: relative; }
.dark-section { color: var(--paper); background: var(--deep-2); }

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 80;
  height: var(--header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-inline: max(24px, calc((100vw - var(--max)) / 2));
  background: rgba(243, 247, 250, .76);
  border-bottom: 1px solid rgba(52, 79, 104, .09);
  backdrop-filter: blur(20px);
  transition: background .3s ease, box-shadow .3s ease;
}
.site-header.scrolled { background: rgba(243, 247, 250, .92); box-shadow: 0 10px 35px rgba(52, 79, 104, .06); }
.brand { display: flex; align-items: center; gap: 11px; }
.header-brand { height: 68px; }
.brand-logo {
  display: block;
  width: 104px;
  height: 68px;
  object-fit: contain;
  filter: drop-shadow(0 7px 14px rgba(52, 79, 104, .08));
}
.brand-glyph {
  position: relative;
  width: 31px;
  height: 36px;
  flex: 0 0 auto;
}
.brand-glyph::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 5px;
  width: 3px;
  height: 25px;
  border-radius: 3px 3px 8px 8px;
  background: var(--brand-teal);
  box-shadow: 7px 0 0 rgba(57, 116, 136, .72);
}
.brand-glyph::after,
.brand-glyph b {
  content: "";
  position: absolute;
  left: 2px;
  width: 27px;
  height: 10px;
  border-top: 2px solid var(--brand-green);
  border-radius: 50%;
  transform: rotate(-11deg);
}
.brand-glyph::after { top: 10px; }
.brand-glyph b { top: 21px; transform: rotate(9deg); opacity: .72; }
.brand-glyph i { position: absolute; left: 7px; bottom: 2px; width: 17px; height: 3px; border-radius: 50%; background: var(--blue); }
.brand-type strong, .brand-type small { display: block; line-height: 1; }
.brand strong { font-size: 13px; letter-spacing: .22em; }
.brand small { margin-top: 6px; color: #728aa0; font-size: 8px; letter-spacing: .14em; }
.site-header nav { display: flex; align-items: center; gap: 27px; font-size: 12px; }
.site-header nav a { position: relative; padding-block: 8px; }
.site-header nav a:not(.nav-cta)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 4px; height: 1px; background: currentColor; transition: right .25s ease; }
.site-header nav a:hover::after, .site-header nav a:focus-visible::after { right: 0; }
.nav-cta { display: flex; gap: 15px; align-items: center; border: 1px solid currentColor; border-radius: 999px; padding: 9px 15px !important; }
.nav-cta i { font-style: normal; transition: transform .25s ease; }
.nav-cta:hover i { transform: translate(2px, -2px); }
.menu-toggle { display: none; border: 0; background: transparent; padding: 8px; }
.menu-toggle span { display: block; width: 20px; height: 1px; margin: 4px 0; background: currentColor; transition: transform .25s, opacity .25s; }
.menu-toggle b { position: absolute; width: 1px; height: 1px; clip: rect(0 0 0 0); overflow: hidden; }

/* Navigation progress */
.scroll-rail { position: fixed; right: 25px; top: 50%; z-index: 60; display: flex; gap: 15px; color: var(--ink); transform: translateY(-50%); transition: color .3s ease; }
.rail-track { position: relative; width: 2px; background: rgba(52, 79, 104, .17); }
.rail-track i { display: block; width: 3px; height: 0; background: linear-gradient(var(--brand-teal), var(--brand-green)); transition: height .12s linear; }
.scroll-rail ol { display: flex; flex-direction: column; gap: 9px; margin: 0; padding: 0; list-style: none; }
.scroll-rail li { opacity: .32; transition: opacity .25s, transform .25s; }
.scroll-rail li:hover { opacity: .72; }
.scroll-rail li.active { opacity: 1; transform: translateX(-5px); }
.scroll-rail button { display: flex; align-items: baseline; gap: 10px; min-height: 24px; padding: 2px 0 2px 6px; border: 0; background: transparent; text-transform: uppercase; cursor: pointer; }
.scroll-rail button span { min-width: 25px; font: italic 14px Georgia, serif; }
.scroll-rail button b { font-size: 11px; font-weight: 600; letter-spacing: .11em; }
.scroll-rail.on-dark { color: #f4f8fb; }
.scroll-rail.on-dark .rail-track { background: rgba(255, 255, 255, .3); }
.scroll-rail.on-dark .rail-track i { background: linear-gradient(#c9e4ec, #a7d6c1); box-shadow: 0 0 10px rgba(201, 228, 236, .36); }
.scroll-rail.on-dark li { opacity: .48; }
.scroll-rail.on-dark li:hover { opacity: .78; }
.scroll-rail.on-dark li.active { opacity: 1; }
.mobile-chapter { display: none; }

/* Shared typography */
.eyebrow { margin: 0 0 20px; color: var(--mid); font-size: 10px; font-weight: 700; letter-spacing: .2em; }
.eyebrow.light { color: var(--cloud); }
h1, h2, h3, p { text-wrap: pretty; }
h1, h2, h3 { font-family: Georgia, "Songti SC", serif; font-weight: 400; }
.section-heading { position: relative; z-index: 2; margin-bottom: 58px; }
.section-heading h2, .tech-heading h2, .impact-heading h2, .problem-intro h2 { margin: 0; font-size: clamp(42px, 5.1vw, 66px); line-height: 1.08; letter-spacing: -.045em; }
.section-heading.split { display: flex; justify-content: space-between; align-items: flex-end; gap: 60px; }
.section-heading.split > p { max-width: 430px; margin: 0; color: #72899e; font-size: 14px; }
.dark-section .section-heading.split > p { color: var(--mist); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 18px; padding: 12px 20px; border: 1px solid transparent; border-radius: 999px; font-size: 12px; transition: transform .25s, background .25s, border-color .25s; }
.button i { font-style: normal; transition: transform .25s; }
.button:hover { transform: translateY(-2px); }
.button:hover i { transform: translateY(2px); }
.button.primary { color: #fff; background: var(--brand-teal); box-shadow: 0 12px 30px rgba(57,116,136,.14); }
.button.primary:hover { background: #2f687b; }
.button.ghost { border-color: var(--line); background: rgba(255, 255, 255, .4); }
.asset-tag { position: absolute; top: 20px; left: 22px; z-index: 5; font-size: 8px; font-weight: 700; letter-spacing: .13em; }
.light-tag { color: var(--mist); }

/* Hero */
.hero { height: 130vh; min-height: 880px; --hero-progress: 0; }
.hero-sticky {
  position: sticky; top: 0; height: 100vh; min-height: 700px;
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(420px, .88fr);
  grid-template-rows: 1fr auto;
  align-items: center;
  gap: 30px 64px;
  padding: 110px max(70px, calc((100vw - var(--max)) / 2)) 30px;
  overflow: hidden;
  background:
    linear-gradient(rgba(52, 79, 104, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(52, 79, 104, .045) 1px, transparent 1px),
    radial-gradient(circle at 79% 30%, rgba(183, 199, 216, .52), transparent 27%),
    linear-gradient(145deg, #f6f9fb, #edf3f7 58%, #dfe9f1);
  background-size: 70px 70px, 70px 70px, auto, auto;
}
.hero-copy { position: relative; z-index: 4; max-width: 650px; transform: translateY(calc(var(--hero-progress) * -32px)); opacity: calc(1 - var(--hero-progress) * .55); }
.hero-name { display: flex; align-items: center; gap: 16px; max-width: 540px; color: #7890a5; font-size: 10px; letter-spacing: .08em; }
.hero-name::after { content: ""; order: 2; flex: 1; height: 1px; background: var(--line); }
.hero-name b { order: 3; font: italic 13px Georgia, serif; }
.hero-title {
  position: relative;
  width: fit-content;
  margin: 30px 0 0;
  color: var(--ink);
  font-family: "Bodoni MT", Didot, "Bodoni 72", "Times New Roman", serif;
  font-size: clamp(90px, 8.6vw, 138px);
  font-weight: 400;
  line-height: .8;
  letter-spacing: .12em;
  font-variant-ligatures: none;
}
.hero-title::after {
  content: "";
  position: absolute;
  right: .11em;
  bottom: -.2em;
  width: 26%;
  height: 2px;
  background: var(--blue);
}
.hero-slogan {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 .2em;
  margin: 18px 0 0;
  color: #5e768d;
  font: italic 400 clamp(25px, 2.25vw, 35px)/1.1 Georgia, serif;
  letter-spacing: -.025em;
}
.hero-slogan em { color: var(--mid); font-weight: 400; }
.product-name { display: flex; gap: 14px; align-items: baseline; margin: 26px 0 0; color: var(--deep); }
.product-name strong { font: 400 25px/1 Georgia, "Songti SC", serif; letter-spacing: .015em; }
.product-name span { color: #71889d; font-family: "Songti SC", serif; font-size: 17px; }
.hero-description { max-width: 520px; margin: 18px 0 0; color: #6e859a; font-size: 14px; }
.hero-actions { display: flex; gap: 11px; margin-top: 30px; }
.hero-visual {
  position: relative; z-index: 3;
  width: min(100%, 540px); height: min(70vh, 660px); min-height: 520px; justify-self: end;
  border: 0; border-radius: 0;
  background: transparent;
  box-shadow: none;
  overflow: visible;
  isolation: isolate;
  transform: translate(calc(var(--hero-progress) * -7vw), calc(var(--hero-progress) * 12px)) scale(calc(1 + var(--hero-progress) * .08));
  transition: transform .2s linear;
}
.windora-viewer {
  position: absolute;
  inset: -4% -5% 4%;
  z-index: 1;
  overflow: visible;
  outline: 0;
  cursor: grab;
  touch-action: none;
  transform: translateY(calc(var(--hero-progress) * -13px));
  filter: drop-shadow(0 35px 28px rgba(52,79,104,.2));
  transition: filter .35s ease, transform .2s linear;
}
.windora-viewer:active { cursor: grabbing; }
.windora-viewer:focus-visible { outline: 1px solid rgba(57,116,136,.42); outline-offset: 8px; border-radius: 50%; }
.windora-viewer canvas { display: block; width: 100%; height: 100%; background: transparent; }
.hero-product-fallback {
  position: absolute;
  inset: 1% 0 3%;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center bottom;
  transform: scale(1.04);
  filter: saturate(.94) contrast(1.015) drop-shadow(0 34px 28px rgba(52,79,104,.22));
  transition: opacity .5s ease, transform .8s var(--ease), filter .4s ease;
}
.windora-viewer.is-ready .hero-product-fallback { opacity: 0; pointer-events: none; }
.windora-viewer.is-fallback { cursor: default; }
.viewer-loading { position: absolute; left: 50%; bottom: 8%; z-index: 4; display: flex; align-items: center; gap: 9px; transform: translateX(-50%); color: #71899e; font-size: 7px; letter-spacing: .14em; white-space: nowrap; transition: opacity .35s; }
.viewer-loading i { width: 17px; height: 17px; border: 1px solid rgba(52,79,104,.2); border-top-color: var(--brand-teal); border-radius: 50%; animation: viewer-spin 1s linear infinite; }
.windora-viewer.is-ready .viewer-loading, .windora-viewer.is-fallback .viewer-loading { opacity: 0; pointer-events: none; }
@keyframes viewer-spin { to { transform: rotate(360deg); } }
.viewer-hint { position: absolute; left: 50%; bottom: 34px; z-index: 5; display: flex; align-items: center; gap: 9px; padding: 7px 11px; border: 1px solid rgba(52,79,104,.12); border-radius: 999px; color: #657e94; background: rgba(248,250,252,.55); backdrop-filter: blur(8px); transform: translateX(-50%); font-size: 7px; font-weight: 700; letter-spacing: .1em; white-space: nowrap; transition: opacity .4s, transform .4s; pointer-events: none; }
.viewer-hint i { width: 12px; height: 12px; border: 1px solid currentColor; border-radius: 50%; }
.viewer-hint i::after { content: ""; display: block; width: 1px; height: 4px; margin: 2px auto 0; background: currentColor; }
.hero-visual.is-interacting .viewer-hint { opacity: 0; transform: translate(-50%, 8px); }
.hero-visual > .asset-tag { left: 50%; transform: translateX(-50%); white-space: nowrap; }
.hero-visual::after { display: none; }
.hero-visual-label { position: absolute; left: 12px; right: 12px; bottom: 0; z-index: 6; display: flex; align-items: end; justify-content: space-between; color: var(--ink); text-shadow: none; pointer-events: none; }
.hero-visual-label span { font-size: 7px; font-weight: 700; letter-spacing: .16em; }
.hero-visual-label b { font: 400 italic 22px Georgia, serif; letter-spacing: .06em; }
.hero-visual > p { position: absolute; bottom: 15px; inset-inline: 18px; z-index: 4; margin: 0; text-align: center; color: #71899e; font-size: 9px; letter-spacing: .08em; opacity: calc(1 - var(--hero-progress) * 1.4); }
.tower { position: absolute; filter: drop-shadow(0 28px 30px rgba(52,79,104,.22)); }
.tower-hero { left: 50%; top: 50%; width: 220px; height: 430px; z-index: 3; transform: translate(-50%, -47%); }
.tower-crown { position: absolute; top: 0; left: 50%; width: 170px; height: 92px; transform: translateX(-50%); border: 12px solid var(--deep); border-bottom: 0; border-radius: 95px 95px 0 0; }
.tower-crown::before { content: ""; position: absolute; left: 50%; top: 43px; width: 9px; height: 9px; background: var(--paper); border: 5px solid var(--deep); border-radius: 50%; transform: translate(-50%,-50%); }
.tower-crown i { position: absolute; left: 50%; top: 40px; width: 54px; height: 6px; border-radius: 6px; background: var(--deep); transform-origin: 0 50%; }
.tower-crown i:nth-child(1) { transform: rotate(0); }
.tower-crown i:nth-child(2) { transform: rotate(120deg); }
.tower-crown i:nth-child(3) { transform: rotate(240deg); }
.tower-neck { position: absolute; top: 80px; left: 50%; width: 26px; height: 30px; background: var(--deep); transform: translateX(-50%); }
.tower-shell { position: absolute; top: 104px; left: 50%; width: 178px; height: 250px; overflow: hidden; transform: translateX(-50%); clip-path: polygon(12% 0, 88% 0, 100% 100%, 0 100%); background: linear-gradient(90deg, rgba(143,175,204,.98), rgba(215,226,236,.9) 52%, rgba(120,155,185,.85)); border: 1px solid rgba(255,255,255,.8); }
.tower-shell > i { position: absolute; left: 36px; right: 36px; height: 1px; background: rgba(52,79,104,.28); }
.tower-shell > i:nth-child(1) { top: 55px; }.tower-shell > i:nth-child(2) { top: 105px; }.tower-shell > i:nth-child(3) { top: 155px; }.tower-shell > i:nth-child(4) { top: 205px; }
.tower-drawer { position: absolute; left: 50%; top: 350px; width: 205px; height: 58px; transform: translateX(-50%); clip-path: polygon(8% 0,92% 0,100% 100%,0 100%); background: var(--deep); }
.tower-foot { position: absolute; left: 50%; top: 405px; width: 230px; height: 22px; transform: translateX(-50%); border-radius: 2px 2px 12px 12px; background: var(--ink); }
.air-lines { position: absolute; inset: 0; z-index: 2; opacity: calc(.15 + var(--hero-progress)); }
.air-lines i { position: absolute; right: 48%; width: calc(28% + var(--hero-progress) * 26%); height: 1px; border-radius: 50%; background: linear-gradient(90deg, transparent, var(--mid), rgba(255,255,255,.7)); transform: translateX(calc(var(--hero-progress) * 10%)); }
.air-lines i:nth-child(1) { top: 35%; }.air-lines i:nth-child(2) { top: 43%; width: calc(35% + var(--hero-progress) * 29%); }.air-lines i:nth-child(3) { top: 51%; }.air-lines i:nth-child(4) { top: 59%; width: calc(22% + var(--hero-progress) * 30%); }
.callout { position: absolute; z-index: 4; display: flex; align-items: center; gap: 7px; font-size: 7px; font-weight: 700; letter-spacing: .12em; }
.callout i { width: 48px; height: 1px; background: var(--ink); }
.callout-a { right: 14px; top: 28%; }.callout-b { left: 18px; bottom: 28%; flex-direction: row-reverse; }
.hero-meta { grid-column: 1 / -1; position: relative; z-index: 4; display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); opacity: calc(1 - var(--hero-progress) * 1.2); }
.hero-meta > div { display: grid; grid-template-columns: 45px 1fr; padding: 18px 25px 0; border-right: 1px solid var(--line); }
.hero-meta > div:first-child { padding-left: 0; }.hero-meta > div:last-child { border: 0; }
.hero-meta b { grid-row: 1/3; color: var(--blue); font: italic 28px Georgia, serif; }
.hero-meta span { color: #8397a9; font-size: 8px; letter-spacing: .13em; text-transform: uppercase; }
.hero-meta strong { font-size: 9px; letter-spacing: .07em; }
.hero-orbit { position: absolute; border: 1px solid rgba(143,175,204,.22); border-radius: 50%; pointer-events: none; }
.orbit-one { right: -11vw; top: -16vw; width: 43vw; height: 43vw; transform: rotate(calc(var(--hero-progress) * 30deg)); }
.orbit-two { right: 2vw; top: 10vw; width: 24vw; height: 24vw; transform: rotate(calc(var(--hero-progress) * -45deg)); }
.scroll-cue { position: absolute; right: max(28px, calc((100vw - var(--max)) / 2)); bottom: 25px; z-index: 5; display: flex; align-items: center; gap: 11px; font-size: 7px; letter-spacing: .16em; }
.scroll-cue i { width: 28px; height: 28px; border: 1px solid var(--line); border-radius: 50%; }
.scroll-cue i::after { content: ""; display: block; width: 1px; height: 8px; margin: 8px auto; background: currentColor; animation: cue 1.6s ease-in-out infinite; }
@keyframes cue { 50% { transform: translateY(4px); } }

/* Problem */
.problem { position: relative; min-height: 180vh; padding: 118px 0 75px; --problem-progress: 0; overflow: clip; }
.problem::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at calc(72% - var(--problem-progress) * 22%) calc(24% + var(--problem-progress) * 45%), rgba(143,175,204,.2), transparent 28%); }
.problem-grid { display: grid; grid-template-columns: .92fr 1.08fr; gap: clamp(65px, 10vw, 150px); position: relative; z-index: 2; }
.sticky-copy { position: sticky; top: 140px; align-self: start; }
.problem-intro h2 { margin-bottom: 25px; }
.problem-intro > p:last-of-type { max-width: 480px; color: var(--mist); font-size: 13px; }
.problem-meter { margin-top: 50px; }
.problem-meter span { font-size: 8px; letter-spacing: .15em; }
.problem-meter > i { display: block; width: min(100%, 380px); height: 2px; margin-top: 10px; background: rgba(255,255,255,.12); }
.problem-meter b { display: block; width: calc(12% + var(--problem-progress) * 88%); height: 100%; background: linear-gradient(90deg, var(--cloud), #fff); }
.problem-steps { margin: 0; padding: 0; list-style: none; }
.problem-steps li { min-height: 52vh; display: grid; grid-template-columns: 80px 1fr; align-content: center; gap: 25px; border-top: 1px solid rgba(255,255,255,.12); opacity: .26; transform: translateY(18px); transition: opacity .45s, transform .45s; }
.problem-steps li.active { opacity: 1; transform: none; }
.problem-steps > li > span { font: italic 38px Georgia, serif; color: var(--cloud); }
.problem-steps small { font-size: 8px; letter-spacing: .16em; color: var(--cloud); }
.problem-steps h3 { margin: 8px 0 12px; font-size: 32px; }
.problem-steps p { max-width: 430px; margin: 0; color: var(--mist); font-size: 13px; }
.dust-field { position: absolute; inset: 0; pointer-events: none; opacity: calc(.25 + var(--problem-progress) * .75); }
.dust-field i { position: absolute; width: var(--size); height: var(--size); border-radius: 50%; background: var(--cloud); opacity: calc(.1 + var(--problem-progress) * var(--opacity)); transform: translate(calc(var(--problem-progress) * var(--drift-x)), calc(var(--problem-progress) * var(--drift-y))); transition: opacity .15s linear; }
.direction-transition { position: absolute; left: 50%; bottom: 34px; z-index: 3; display: flex; align-items: center; gap: 14px; transform: translateX(-50%); font-size: 7px; letter-spacing: .18em; white-space: nowrap; }
.direction-transition i { width: min(17vw, 180px); height: 1px; background: linear-gradient(90deg, transparent, var(--cloud)); }
.direction-transition i:nth-of-type(2) { transform: scaleX(-1); }
.direction-transition b { font-size: 16px; font-weight: 400; }

/* Solution */
.solution { min-height: 110vh; display: flex; flex-direction: column; justify-content: center; overflow: hidden; }
.solution-flow { position: relative; display: grid; grid-template-columns: repeat(5, 1fr); margin-top: 80px; }
.flow-line { position: absolute; left: 10%; right: 10%; top: 42px; height: 1px; background: var(--line); }
.flow-line i { display: block; width: 0; height: 2px; background: linear-gradient(90deg, var(--blue), var(--deep)); transition: width 1.8s var(--ease); }
.solution-flow.visible .flow-line i { width: 100%; }
.solution-flow article { position: relative; z-index: 2; padding: 0 12px; text-align: center; opacity: .42; transition: opacity .35s, transform .35s; }
.solution-flow article:hover, .solution-flow article.active { opacity: 1; transform: translateY(-6px); }
.solution-flow article > b { display: grid; place-items: center; width: 84px; height: 84px; margin: 0 auto 30px; border: 1px solid var(--line); border-radius: 50%; background: var(--paper); color: var(--mid); font: italic 18px Georgia, serif; transition: color .3s, background .3s; }
.solution-flow article:hover > b, .solution-flow article.active > b { color: #fff; background: var(--ink); }
.flow-symbol { display: block; font: 34px Georgia, serif; }
.solution-flow h3 { margin: 9px 0 2px; font-size: 18px; }
.solution-flow p { margin: 0; color: #8396a7; font-size: 8px; letter-spacing: .1em; text-transform: uppercase; }
.solution-note { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-top: 85px; padding: 15px 20px; border-left: 2px solid var(--mid); background: var(--silver); }
.solution-note span { font-size: 8px; font-weight: 700; letter-spacing: .16em; }.solution-note p { margin: 0; font-size: 11px; }

.concept-showcase { margin-top: 108px; }
.concept-heading { display: flex; align-items: end; justify-content: space-between; gap: 60px; margin-bottom: 28px; }
.concept-heading .eyebrow { margin-bottom: 11px; }
.concept-heading h3 { margin: 0; font-size: clamp(33px, 4vw, 52px); line-height: 1.05; letter-spacing: -.035em; }
.concept-heading > p { max-width: 385px; margin: 0; color: #72899e; font-size: 12px; }
.concept-gallery { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.concept-card { position: relative; aspect-ratio: 16 / 9; margin: 0; overflow: hidden; border: 1px solid rgba(52,79,104,.11); border-radius: 4px; background: var(--silver); box-shadow: 0 24px 60px rgba(52,79,104,.09); }
.concept-card-wide { grid-column: 1 / -1; }
.concept-card img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .8s var(--ease), filter .5s ease; }
.concept-card::after { content: ""; position: absolute; inset: 48% 0 0; background: linear-gradient(transparent, rgba(30,45,58,.56)); pointer-events: none; }
.concept-card:hover img { transform: scale(1.025); filter: contrast(1.02); }
.concept-card figcaption { position: absolute; left: 20px; right: 20px; bottom: 17px; z-index: 2; display: flex; align-items: end; gap: 13px; color: #fff; text-shadow: 0 2px 14px rgba(28,43,55,.35); }
.concept-card figcaption > span { font: italic 30px/1 Georgia, serif; }
.concept-card figcaption b, .concept-card figcaption small { display: block; }
.concept-card figcaption b { font-size: 8px; letter-spacing: .15em; }
.concept-card figcaption small { margin-top: 2px; font-size: 9px; }
.orthographic-gallery { grid-template-columns: repeat(3, minmax(0, 1fr)); align-items: center; gap: 14px; }
.orthographic-card { display: flex; flex-direction: column; aspect-ratio: auto; overflow: visible; border: 0; border-radius: 0; background: transparent; box-shadow: none; }
.orthographic-card-portrait, .orthographic-card-square { align-self: center; aspect-ratio: auto; }
.orthographic-image { position: relative; width: 100%; overflow: hidden; border: 1px solid rgba(52,79,104,.11); border-radius: 4px; background: #f4f2f0; box-shadow: 0 24px 60px rgba(52,79,104,.09); }
.orthographic-card-portrait .orthographic-image { aspect-ratio: 2 / 3; }
.orthographic-card-square .orthographic-image { aspect-ratio: 1 / 1; }
.orthographic-card img { object-fit: contain; background: #f4f2f0; }
.orthographic-card::after { display: none; }
.orthographic-card figcaption { position: static; min-height: 122px; padding: 22px 8px 12px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; color: var(--ink); text-align: center; text-shadow: none; }
.orthographic-card figcaption > span { color: var(--blue); font: italic 42px/1 Georgia, serif; }
.orthographic-card figcaption > div { display: flex; flex-direction: column; align-items: center; gap: 7px; }
.orthographic-card figcaption b { color: var(--ink); font-size: 16px; letter-spacing: .16em; }
.orthographic-card figcaption small { margin-top: 0; color: #667f95; font-size: 16px; line-height: 1.4; }
.orthographic-card:hover img { transform: scale(1.012); }

/* Product Demo */
.demo { padding-bottom: 80px; }
.demo-grid { display: grid; grid-template-columns: 1.18fr .82fr; gap: clamp(35px, 6vw, 85px); align-items: start; }
.demo-stage { position: sticky; top: 102px; height: calc(100vh - 128px); min-height: 580px; overflow: hidden; isolation: isolate; border-radius: 6px; background: radial-gradient(circle at 68% 28%, rgba(255,255,255,.9), transparent 25%), linear-gradient(145deg, #eef4f8, #d7e2ec 55%, #b7c7d8); }
.stage-grid { position: absolute; inset: 0; z-index: -1; background: linear-gradient(rgba(52,79,104,.055) 1px, transparent 1px), linear-gradient(90deg, rgba(52,79,104,.055) 1px, transparent 1px); background-size: 44px 44px; mask-image: linear-gradient(to bottom, transparent, #000 20%, #000 80%, transparent); }
.demo-progress { position: absolute; left: 22px; top: 22px; bottom: 22px; width: 2px; background: rgba(52,79,104,.15); }
.demo-progress i { display: block; width: 100%; height: 20%; background: var(--ink); transition: height .55s var(--ease); }
.demo-model { position: absolute; inset: 2% 3% 8%; z-index: 1; pointer-events: none; filter: drop-shadow(0 30px 27px rgba(52,79,104,.22)); }
.demo-model canvas { display: block; width: 100%; height: 100%; background: transparent; }
.demo-model-fallback { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; object-position: center bottom; filter: saturate(.94) contrast(1.015); transition: opacity .45s ease; }
.demo-model.is-ready .demo-model-fallback { opacity: 0; }
.demo-capture-zone { position: absolute; left: 34%; top: 36%; z-index: 2; width: 42%; height: 38%; border: 1px solid rgba(255,255,255,.72); border-radius: 46%; opacity: 0; box-shadow: inset 0 0 32px rgba(255,255,255,.22), 0 0 26px rgba(143,175,204,.32); transition: opacity .45s, transform .55s; pointer-events: none; }
.demo-brush-sweep { position: absolute; left: 39%; top: 63%; z-index: 3; width: 32%; height: 2px; opacity: 0; background: linear-gradient(90deg, transparent, var(--ink) 15% 85%, transparent); box-shadow: 0 0 9px rgba(52,79,104,.35); pointer-events: none; }
.demo-dust-stream { position: absolute; left: 55%; top: 69%; z-index: 3; width: 2px; height: 0; opacity: 0; background: linear-gradient(var(--ink), transparent); transition: height .5s ease, opacity .35s; pointer-events: none; }
.tower-demo { left: 55%; top: 49%; width: 230px; height: 450px; transform: translate(-50%,-50%); transition: transform .7s var(--ease); }
.tower-demo .tower-shell { height: 270px; }
.tower-demo .tower-drawer { top: 370px; }.tower-demo .tower-foot { top: 425px; }
.tower-demo .electrodes { position: absolute; inset: 62px 42px 82px; background: repeating-linear-gradient(90deg, var(--deep) 0 3px, transparent 3px 17px); opacity: .18; transition: opacity .45s, filter .45s; }
.tower-demo .brush { position: absolute; left: 37px; right: 37px; top: 195px; height: 9px; border-radius: 50%; background: var(--ink); opacity: .18; }
.tower-demo .brush::after { content: ""; position: absolute; left: 8px; right: 8px; top: 8px; height: 22px; background: repeating-linear-gradient(90deg, var(--ink) 0 2px, transparent 2px 7px); }
.dust-drop { position: absolute; left: 50%; top: 212px; width: 5px; height: 0; background: linear-gradient(var(--ink), transparent); transition: height .5s ease; }
.demo-air { position: absolute; inset: 0; pointer-events: none; }
.demo-air i { position: absolute; left: 3%; top: 34%; width: 0; height: 1px; background: linear-gradient(90deg, transparent, var(--mid)); opacity: 0; transition: width .55s, opacity .55s; }
.demo-air i:nth-child(2) { top: 42%; transition-delay: .08s; }.demo-air i:nth-child(3) { top: 50%; transition-delay: .16s; }
.demo-particles { position: absolute; inset: 25% 43% 28% 8%; opacity: 0; background-image: radial-gradient(circle, var(--deep) 0 1px, transparent 2px), radial-gradient(circle, var(--mid) 0 2px, transparent 3px); background-size: 43px 49px, 61px 53px; transition: opacity .45s, transform .65s; }
.stage-copy { position: absolute; left: 52px; bottom: 32px; z-index: 4; max-width: 250px; }
.stage-copy > span { font-size: 7px; font-weight: 700; letter-spacing: .16em; }.stage-copy strong { display: block; margin: 4px 0; font: 400 25px Georgia, "Songti SC", serif; }.stage-copy p { margin: 0; color: #6d859b; font-size: 10px; }
.stage-count { position: absolute; top: 16px; right: 21px; z-index: 4; font: italic 13px Georgia, serif; }.stage-count b { font-size: 42px; font-weight: 400; }.stage-count span { opacity: .45; }
.demo-stage[data-active="1"] .demo-air i, .demo-stage[data-active="2"] .demo-air i { width: 52%; opacity: 1; }
.demo-stage[data-active="1"] .demo-particles, .demo-stage[data-active="2"] .demo-particles { opacity: .72; }
.demo-stage[data-active="2"] .demo-capture-zone { opacity: 1; transform: scale(.96); }
.demo-stage[data-active="2"] .demo-particles { opacity: .28; transform: translateX(48%); }
.demo-stage[data-active="3"] .demo-brush-sweep { opacity: 1; animation: demo-brush-sweep 1.35s ease-in-out infinite; }
.demo-stage[data-active="4"] .demo-dust-stream { height: 90px; opacity: .8; }
@keyframes demo-brush-sweep { 50% { transform: translateY(-76px); } }
.demo-steps { margin: 0; padding: 0; list-style: none; }
.demo-steps li { min-height: 52vh; display: flex; align-items: center; opacity: .25; transform: translateY(16px); transition: opacity .4s, transform .4s; }
.demo-steps li.active { opacity: 1; transform: none; }
.demo-steps button { width: 100%; display: grid; grid-template-columns: 64px 1fr; gap: 10px; padding: 28px 0; text-align: left; border: 0; border-top: 1px solid var(--line); background: transparent; cursor: pointer; }
.demo-steps button > span { font: italic 31px Georgia, serif; color: var(--blue); }.demo-steps small { font-size: 7px; letter-spacing: .16em; color: var(--mid); }.demo-steps b { display: block; margin: 5px 0; font: 400 25px Georgia, "Songti SC", serif; }.demo-steps p { max-height: 0; margin: 0; overflow: hidden; color: #738a9f; font-size: 12px; transition: max-height .3s, margin .3s; }.demo-steps button[aria-expanded="true"] p { max-height: 50px; margin-top: 7px; }

/* Technology scan */
.technology { position: relative; padding: 118px 0 80px; }
.tech-heading { margin-bottom: 70px; }.tech-heading h2 { margin: 0; }
.tech-story { display: grid; grid-template-columns: .86fr 1.14fr; gap: clamp(55px, 9vw, 125px); align-items: start; }
.tech-list { margin: 0; padding: 0; list-style: none; }
.tech-list li { min-height: 52vh; display: flex; align-items: center; opacity: .22; transition: opacity .4s, transform .4s; }
.tech-list li.active { opacity: 1; transform: translateX(12px); }
.tech-list button { width: 100%; display: grid; grid-template-columns: 62px 1fr; gap: 14px; padding: 25px 0; color: inherit; text-align: left; border: 0; border-top: 1px solid rgba(255,255,255,.16); background: transparent; cursor: pointer; }
.tech-list button > span { font: italic 27px Georgia, serif; color: var(--cloud); }
.tech-list small { font-size: 7px; letter-spacing: .16em; color: var(--cloud); }
.tech-list h3 { margin: 4px 0; font-size: 26px; }.tech-list p { margin: 0; color: var(--mist); font-size: 11px; }
.tech-stage { position: sticky; top: 100px; height: calc(100vh - 125px); min-height: 610px; overflow: hidden; border: 1px solid rgba(255,255,255,.15); background: radial-gradient(circle at 52% 40%, rgba(143,175,204,.24), transparent 35%), linear-gradient(145deg, rgba(255,255,255,.045), rgba(255,255,255,.01)); }
.tech-stage::before { content: ""; position: absolute; inset: 0; background: linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px); background-size: 38px 38px; mask-image: radial-gradient(circle, #000, transparent 76%); }
.tech-model { position: absolute; inset: 0 5% 5%; z-index: 1; pointer-events: none; filter: drop-shadow(0 30px 42px rgba(0,0,0,.25)); }
.tech-model canvas { display: block; width: 100%; height: 100%; background: transparent; }
.tech-model-fallback { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; object-position: center bottom; filter: brightness(.92) saturate(.8); transition: opacity .45s ease; }
.tech-model.is-ready .tech-model-fallback { opacity: 0; }
.tech-module-zone { position: absolute; left: 28%; right: 28%; z-index: 2; border: 1px solid rgba(201,228,236,.9); border-radius: 50%; opacity: 0; background: radial-gradient(ellipse, rgba(143,175,204,.2), transparent 68%); box-shadow: inset 0 0 24px rgba(201,228,236,.15), 0 0 22px rgba(143,175,204,.28); transform: scale(.92); transition: opacity .4s ease, transform .55s var(--ease); pointer-events: none; }
.tech-zone-0 { top: 11%; height: 27%; }
.tech-zone-1 { top: 34%; height: 13%; }
.tech-zone-2 { top: 43%; height: 25%; }
.tech-zone-3 { top: 61%; height: 14%; }
.tech-zone-4 { top: 72%; height: 18%; }
.tech-stage[data-active="0"] .tech-zone-0, .tech-stage[data-active="1"] .tech-zone-1, .tech-stage[data-active="2"] .tech-zone-2, .tech-stage[data-active="3"] .tech-zone-3, .tech-stage[data-active="4"] .tech-zone-4 { opacity: 1; transform: scale(1); }
.tech-tower { position: absolute; left: 50%; top: 50%; width: 270px; height: 520px; transform: translate(-50%,-48%); filter: drop-shadow(0 28px 45px rgba(0,0,0,.18)); }
.tech-rotor { position: absolute; top: 0; left: 50%; width: 190px; height: 100px; transform: translateX(-50%); border: 2px solid rgba(215,226,236,.8); border-bottom: 0; border-radius: 100px 100px 0 0; transition: filter .45s, border-color .45s; }
.tech-rotor::before { content: ""; position: absolute; left: 50%; top: 49px; width: 12px; height: 12px; border: 2px solid var(--mist); border-radius: 50%; transform: translate(-50%,-50%); background: var(--deep-2); }
.tech-rotor i { position: absolute; left: 50%; top: 48px; width: 66px; height: 2px; background: var(--mist); transform-origin: left; }.tech-rotor i:nth-child(2) { transform: rotate(120deg); }.tech-rotor i:nth-child(3) { transform: rotate(240deg); }
.tech-shell { position: absolute; left: 50%; top: 94px; width: 225px; height: 335px; transform: translateX(-50%); border: 1px solid rgba(215,226,236,.55); clip-path: polygon(12% 0,88% 0,100% 100%,0 100%); background: rgba(143,175,204,.06); transition: box-shadow .45s, background .45s; }
.guide-line { position: absolute; left: 22%; top: 18px; width: 56%; height: 270px; border: 1px dashed rgba(215,226,236,.35); border-radius: 45%; transition: border-color .45s; }
.plate { position: absolute; top: 85px; bottom: 86px; width: 2px; background: rgba(215,226,236,.45); transition: box-shadow .4s, background .4s; }.plate-a { left: 39%; }.plate-b { left: 50%; }.plate-c { left: 61%; }
.tech-brush { position: absolute; left: 31%; right: 31%; top: 245px; height: 6px; background: rgba(215,226,236,.5); transition: box-shadow .4s, background .4s; }.tech-brush::after { content: ""; position: absolute; left: 0; right: 0; top: 7px; height: 18px; background: repeating-linear-gradient(90deg, rgba(215,226,236,.5) 0 1px, transparent 1px 5px); }
.tech-bin { position: absolute; left: 50%; top: 426px; width: 245px; height: 72px; transform: translateX(-50%); border: 1px solid rgba(215,226,236,.55); clip-path: polygon(8% 0,92% 0,100% 100%,0 100%); background: rgba(143,175,204,.08); transition: box-shadow .45s, background .45s; }
.scan-beam { position: absolute; left: 12%; right: 12%; top: 17%; z-index: 3; height: 1px; background: #fff; box-shadow: 0 0 14px 5px rgba(143,175,204,.55); transition: top .65s var(--ease); }
.hotspot { position: absolute; z-index: 5; display: flex; align-items: center; gap: 8px; opacity: .2; font-size: 7px; font-weight: 700; letter-spacing: .13em; transition: opacity .4s, transform .4s; }
.hotspot i { display: block; width: 58px; height: 1px; background: var(--mist); }.hotspot::before { content: ""; width: 7px; height: 7px; border: 1px solid var(--mist); border-radius: 50%; }
.hotspot-0 { right: 5%; top: 22%; }.hotspot-1 { left: 5%; top: 39%; flex-direction: row-reverse; }.hotspot-2 { right: 3%; top: 48%; }.hotspot-3 { left: 5%; top: 65%; flex-direction: row-reverse; }.hotspot-4 { right: 4%; top: 78%; }
.tech-stage[data-active="0"] .hotspot-0, .tech-stage[data-active="1"] .hotspot-1, .tech-stage[data-active="2"] .hotspot-2, .tech-stage[data-active="3"] .hotspot-3, .tech-stage[data-active="4"] .hotspot-4 { opacity: 1; transform: translateX(4px); }
.tech-stage[data-active="0"] .tech-rotor { border-color: #fff; filter: drop-shadow(0 0 10px rgba(255,255,255,.45)); }
.tech-stage[data-active="1"] .guide-line { border-color: #fff; }.tech-stage[data-active="1"] .tech-shell { background: rgba(143,175,204,.14); }
.tech-stage[data-active="2"] .plate { background: #fff; box-shadow: 0 0 12px 2px rgba(255,255,255,.5); }
.tech-stage[data-active="3"] .tech-brush { background: #fff; box-shadow: 0 0 12px rgba(255,255,255,.5); animation: tech-brush 1.5s ease-in-out infinite; }
.tech-stage[data-active="4"] .tech-bin { background: rgba(143,175,204,.28); box-shadow: 0 0 24px rgba(143,175,204,.3); }
.tech-stage[data-active="0"] .scan-beam { top: 20%; }.tech-stage[data-active="1"] .scan-beam { top: 37%; }.tech-stage[data-active="2"] .scan-beam { top: 49%; }.tech-stage[data-active="3"] .scan-beam { top: 65%; }.tech-stage[data-active="4"] .scan-beam { top: 80%; }
@keyframes tech-brush { 50% { transform: translateY(-48px); } }
.tech-status { position: absolute; left: 20px; right: 20px; bottom: 18px; display: flex; align-items: baseline; gap: 8px; border-top: 1px solid rgba(255,255,255,.15); padding-top: 12px; }.tech-status span { margin-right: auto; font-size: 7px; letter-spacing: .15em; }.tech-status b { font: italic 28px Georgia, serif; }.tech-status i { font: italic 11px Georgia, serif; opacity: .45; }

/* Applications */
.impact { position: relative; padding: 112px 0; background: var(--paper); }
.impact-heading { margin-bottom: 58px; }.impact-heading h2 { margin: 0; }
.scenario-story { display: grid; grid-template-columns: 1.22fr .78fr; gap: clamp(35px, 6vw, 80px); align-items: start; }
.scenario-stage { --capture-x: 65%; position: sticky; top: 102px; height: calc(100vh - 128px); min-height: 570px; overflow: hidden; border: 1px solid rgba(111,134,152,.28); background: #d9e1e6; isolation: isolate; }
.scene { position: absolute; inset: 0; z-index: 0; margin: 0; overflow: hidden; opacity: 0; transform: scale(1.045); transition: opacity .72s, transform 1.15s var(--ease); }
.scene.active { opacity: 1; transform: scale(1); }
.scene img { width: 100%; height: 100%; display: block; object-fit: cover; object-position: center; filter: saturate(.88) contrast(.97); }
.scene-campus img, .scene-park img, .scene-public img { object-position: 67% center; }
.scene::before { content: ""; position: absolute; inset: 0; z-index: 1; background: linear-gradient(90deg, rgba(17,31,42,.25), transparent 45%, rgba(17,31,42,.05)), linear-gradient(to top, rgba(14,29,41,.48), transparent 36%); }
.scenario-dust-field { position: absolute; inset: 0; z-index: 5; overflow: hidden; pointer-events: none; }
.scenario-dust-field i { position: absolute; left: -2%; top: var(--dust-y); width: var(--dust-size); height: var(--dust-size); border-radius: 50%; opacity: 0; background: rgba(218,201,169,.92); box-shadow: 0 0 7px rgba(197,175,132,.5); animation: scenario-dust-capture var(--dust-duration) linear var(--dust-delay) infinite; }
.scenario-stage[data-active="1"] .scenario-dust-field i { background: rgba(191,170,137,.88); }
.scenario-stage[data-active="2"] .scenario-dust-field i { background: rgba(212,190,153,.86); }
@keyframes scenario-dust-capture { 0% { left: -2%; top: var(--dust-y); opacity: 0; transform: translateY(0) scale(1.05); } 12% { opacity: .8; } 70% { opacity: .72; } 100% { left: var(--capture-x); top: 42%; opacity: 0; transform: translateY(var(--dust-lift)) scale(.08); } }
.scenario-airflow { position: absolute; z-index: 3; left: 5%; top: 25%; width: 60%; height: 45%; pointer-events: none; opacity: .74; }
.scenario-airflow i { position: absolute; left: 0; right: 0; height: 34%; border-top: 1px solid rgba(242,248,251,.72); border-radius: 50%; transform-origin: right center; animation: scenario-air 3.6s ease-in-out infinite; }
.scenario-airflow i:nth-child(1) { top: 3%; transform: rotate(7deg); }.scenario-airflow i:nth-child(2) { top: 34%; transform: rotate(-2deg); animation-delay: -.9s; }.scenario-airflow i:nth-child(3) { top: 67%; transform: rotate(-8deg); animation-delay: -1.8s; }
@keyframes scenario-air { 50% { opacity: .28; clip-path: inset(0 0 0 48%); } }
.scene-label { position: absolute; left: 22px; bottom: 20px; z-index: 7; color: #fff; text-shadow: 0 1px 18px rgba(0,0,0,.42); }.scene-label span { font-size: 7px; letter-spacing: .15em; }.scene-label h3 { margin: 0; font-size: 36px; font-style: italic; }.scene-label p { margin: -7px 0 0; font-size: 11px; }
.scene-condition { position: absolute; z-index: 7; right: 20px; bottom: 22px; color: #fff; text-align: right; text-shadow: 0 1px 14px rgba(0,0,0,.55); }.scene-condition span { font-size: 7px; letter-spacing: .14em; }.scene-condition p { display: flex; align-items: center; gap: 7px; margin: 4px 0 0; font-size: 9px; }.scene-condition p i { display: inline-block; width: 5px; height: 5px; border-radius: 50%; background: #d9efff; box-shadow: 0 0 0 4px rgba(217,239,255,.18); animation: scenario-status 1.5s ease-in-out infinite; }
@keyframes scenario-status { 50% { opacity: .38; } }
.scenario-steps { margin: 0; padding: 0; list-style: none; }
.scenario-steps li { min-height: 55vh; display: flex; align-items: center; opacity: .26; transition: opacity .4s, transform .4s; }
.scenario-steps li.active { opacity: 1; transform: translateX(-6px); }
.scenario-steps button { width: 100%; display: grid; grid-template-columns: 60px 1fr; gap: 10px; padding: 28px 0; text-align: left; border: 0; border-top: 1px solid var(--line); background: transparent; cursor: pointer; }.scenario-steps button > span { font: italic 29px Georgia, serif; color: var(--blue); }.scenario-steps small { color: var(--mid); font-size: 7px; letter-spacing: .15em; }.scenario-steps b { display: block; margin: 4px 0; font: 400 25px Georgia, "Songti SC", serif; }.scenario-steps p { max-width: 300px; margin: 0; color: #748b9f; font-size: 11px; }
.metrics-bar { display: grid; grid-template-columns: 1.2fr repeat(4, 1fr); margin-top: 70px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.metrics-bar > * { margin: 0; padding: 20px 14px; border-right: 1px solid var(--line); }.metrics-bar > *:last-child { border: 0; }.metrics-bar p span, .metrics-bar div span { display: block; color: var(--mid); font-size: 7px; letter-spacing: .14em; }.metrics-bar p b { font: 400 18px Georgia, "Songti SC", serif; }.metrics-bar div b { font-size: 10px; }.metrics-bar div i { display: block; width: 100%; height: 1px; margin-top: 12px; overflow: hidden; background: var(--line); }.metrics-bar div i::after { content: ""; display: block; width: 45%; height: 100%; background: var(--mid); animation: metric-scan 2.4s linear infinite; }
@keyframes metric-scan { from { transform: translateX(-120%); } to { transform: translateX(260%); } }

/* Roadmap */
.roadmap { min-height: 180vh; padding: 118px 0 105px; --road-progress: 0; }
.timeline-wrap { position: relative; }
.timeline-track { position: absolute; left: 35px; top: 35px; bottom: 84px; width: 1px; background: rgba(255,255,255,.15); }.timeline-track i { display: block; width: 2px; height: calc(var(--road-progress) * 100%); background: linear-gradient(var(--paper), var(--blue)); box-shadow: 0 0 12px rgba(215,226,236,.45); transition: height .1s linear; }
.timeline { margin: 0; padding: 0; list-style: none; }
.timeline li { display: grid; grid-template-columns: 72px 1fr minmax(250px, 390px); align-items: center; gap: 35px; min-height: 300px; opacity: .35; transition: opacity .45s; }.timeline li.visible { opacity: .72; }.timeline li.done.visible, .timeline li.current.visible { opacity: 1; }
.node { position: relative; z-index: 2; display: grid; place-items: center; width: 70px; height: 70px; border: 1px solid rgba(255,255,255,.25); border-radius: 50%; background: var(--deep-2); }.node b { color: var(--cloud); font: italic 19px Georgia, serif; }.timeline .done .node { background: var(--paper); border-color: var(--paper); }.timeline .done .node b { color: var(--ink); }.timeline .current .node { border-color: #fff; animation: node-pulse 2s infinite; }
@keyframes node-pulse { 50% { box-shadow: 0 0 0 11px rgba(243,247,250,0); } }
.timeline-copy small { color: var(--cloud); font-size: 7px; letter-spacing: .16em; }.timeline-copy h3 { margin: 5px 0 8px; font-size: 27px; }.timeline-copy p { margin: 0; color: var(--mist); font-size: 12px; }
.timeline-image { aspect-ratio: 4/3; position: relative; display: grid; place-items: center; overflow: hidden; border: 1px solid rgba(255,255,255,.14); background: linear-gradient(145deg, rgba(255,255,255,.08), rgba(143,175,204,.06)); }.timeline-image::before, .timeline-image::after { content: ""; position: absolute; width: 130%; height: 1px; background: rgba(255,255,255,.09); transform: rotate(27deg); }.timeline-image::after { transform: rotate(-27deg); }.timeline-image span { font-size: 7px; letter-spacing: .15em; }

/* Team */
.team { min-height: 100vh; display: flex; flex-direction: column; justify-content: center; overflow: hidden; }
.team-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 20px; position: relative; z-index: 2; }
.team-photo { position: relative; aspect-ratio: 3/2; display: grid; place-items: center; overflow: hidden; border: 1px solid var(--line); background: linear-gradient(145deg, var(--mist), var(--cloud)); }.team-photo::before, .team-photo::after { content: ""; position: absolute; width: 120%; height: 1px; background: rgba(52,79,104,.12); transform: rotate(33deg); }.team-photo::after { transform: rotate(-33deg); }.team-photo > span { position: absolute; top: 18px; left: 20px; font-size: 7px; letter-spacing: .15em; }.team-photo > div { position: relative; z-index: 2; text-align: center; }.team-photo b { font: italic 38px Georgia, serif; }.team-photo p { margin: 0; font-size: 10px; }
.contact-card { padding: clamp(30px, 5vw, 55px); background: #fff; }.contact-card > p { margin-top: 0; color: var(--mid); font-size: 8px; font-weight: 700; letter-spacing: .16em; }.contact-card h3 { margin: 20px 0 30px; font-size: 29px; line-height: 1.25; }.contact-card ul { margin: 0 0 30px; padding: 0; border-top: 1px solid var(--line); list-style: none; }.contact-card li { display: flex; justify-content: space-between; gap: 20px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 10px; }.contact-card li span { color: var(--mid); font-size: 7px; letter-spacing: .14em; }
.wordmark { position: absolute; left: 0; right: 0; bottom: -42px; z-index: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; color: rgba(8,120,149,.09); line-height: .9; pointer-events: none; white-space: nowrap; }.wordmark span { color: rgba(98,184,146,.16); font: italic clamp(20px,3vw,38px) Georgia, serif; letter-spacing: .12em; }.wordmark b { font-size: clamp(58px, 10vw, 142px); letter-spacing: -.065em; }
footer { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; padding: 34px 0 48px; display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); color: #71899e; font-size: 8px; letter-spacing: .1em; }
.footer-brand { min-width: 180px; }
.footer-slogan { color: #71899e; font: italic 12px Georgia, serif; letter-spacing: .12em; }

/* Reveal */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s var(--ease); }
.reveal.visible { opacity: 1; transform: none; }

/* Tablet */
@media (max-width: 1120px) {
  .scroll-rail { right: 12px; gap: 9px; }
  .scroll-rail button { min-height: 20px; gap: 6px; padding-left: 3px; }
  .scroll-rail button span { min-width: 20px; font-size: 11px; }
  .scroll-rail button b { display: none; }
  .hero-sticky { padding-inline: 45px; grid-template-columns: 1fr minmax(380px,.82fr); gap: 35px; }
  .tech-story { gap: 45px; }.tech-stage { min-height: 560px; }
  .hotspot i { width: 36px; }.hotspot { font-size: 6px; }
}

/* Mobile is a separate structure, not a squeezed desktop */
@media (max-width: 820px) {
  :root { --header: 66px; }
  .content-width { width: min(100% - 36px, 620px); }
  .section { padding-top: 88px; padding-bottom: 88px; }
  .site-header { height: var(--header); padding-inline: 18px; }
  .header-brand { height: 58px; }
  .brand-logo { width: 90px; height: 58px; }
  .brand-glyph { transform: scale(.9); transform-origin: left center; }
  .menu-toggle { display: block; }
  .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
  .site-header nav { position: fixed; inset: var(--header) 0 0; display: flex; flex-direction: column; align-items: stretch; gap: 0; padding: 35px 22px; background: rgba(243,247,250,.98); transform: translateX(100%); transition: transform .35s var(--ease); }
  .site-header nav.open { transform: none; }
  .site-header nav a { padding: 15px 3px; border-bottom: 1px solid var(--line); font: 400 25px Georgia, "Songti SC", serif; }
  .nav-cta { justify-content: space-between; margin-top: 20px; border-radius: 0; padding: 14px 3px !important; }
  .scroll-rail { display: none; }
  .mobile-chapter { position: fixed; top: var(--header); left: 0; right: 0; z-index: 55; display: flex; justify-content: center; gap: 8px; padding: 5px 10px; color: var(--ink); background: rgba(243,247,250,.86); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); font-size: 7px; letter-spacing: .13em; }
  .mobile-chapter span { color: var(--mid); }.mobile-chapter b { font-weight: 700; }
  .section-heading h2, .tech-heading h2, .impact-heading h2, .problem-intro h2 { font-size: clamp(38px, 11vw, 52px); }
  .section-heading.split { display: block; }.section-heading.split > p { margin-top: 22px; }

  .hero { height: auto; min-height: 0; }
  .hero-sticky { position: relative; height: auto; min-height: 100svh; display: flex; flex-direction: column; padding: 120px 18px 55px; gap: 38px; }
  .hero-copy { transform: none; opacity: 1; width: 100%; }
  .hero-title { margin-top: 28px; font-size: clamp(66px, 19vw, 92px); letter-spacing: .085em; }
  .hero-title::after { right: .08em; bottom: -.24em; width: 30%; }
  .product-name { margin-top: 25px; }.product-name strong { font-size: 22px; }.product-name span { font-size: 15px; }
  .hero-slogan { margin-top: 15px; font-size: clamp(27px, 7.7vw, 35px); }
  .hero-description { font-size: 12px; }.hero-actions { flex-direction: column; align-items: stretch; }
  .hero-visual { width: 100%; height: 500px; min-height: 0; margin: 0; transform: none; border-radius: 0; }
  .windora-viewer { inset: -3% -6% 4%; transform: none; }
  .hero-meta { width: 100%; grid-template-columns: 1fr; opacity: 1; }.hero-meta > div { padding: 14px 0; border-right: 0; border-bottom: 1px solid var(--line); }.hero-meta > div:last-child { border: 0; }
  .scroll-cue { display: none; }

  .problem { min-height: auto; padding: 95px 0 55px; }
  .problem-grid { display: block; }
  .sticky-copy { position: relative; top: auto; }
  .problem-meter { margin: 35px 0 50px; }
  .problem-steps li { min-height: auto; padding: 38px 0; grid-template-columns: 52px 1fr; opacity: 1; transform: none; }
  .problem-steps > li > span { font-size: 27px; }.problem-steps h3 { font-size: 26px; }.dust-field i:nth-child(n+23) { display: none; }
  .direction-transition { position: relative; left: auto; bottom: auto; margin: 45px auto 0; justify-content: center; transform: none; }

  .solution { min-height: 0; display: block; }
  .solution-flow { display: grid; grid-template-columns: 1fr; margin-top: 30px; padding-left: 18px; }
  .flow-line { left: 41px; right: auto; top: 42px; bottom: 42px; width: 1px; height: auto; }.flow-line i { width: 2px; height: 0; transition: height 1.7s var(--ease); }.solution-flow.visible .flow-line i { width: 2px; height: 100%; }
  .solution-flow article { display: grid; grid-template-columns: 52px 44px 1fr; align-items: center; gap: 12px; min-height: 105px; padding: 0; text-align: left; opacity: 1; }
  .solution-flow article > b { width: 48px; height: 48px; margin: 0; font-size: 13px; }.flow-symbol { font-size: 25px; }.solution-flow h3 { margin: 0; }.solution-flow p { grid-column: 3; }
  .solution-note { display: block; margin-top: 45px; }.solution-note p { margin-top: 6px; }
  .concept-showcase { margin-top: 76px; }
  .concept-heading { display: block; margin-bottom: 22px; }
  .concept-heading > p { margin-top: 15px; }
  .concept-gallery { grid-template-columns: 1fr; gap: 12px; }
  .orthographic-gallery { grid-template-columns: 1fr; }
  .concept-card-wide { grid-column: auto; }
  .concept-card { aspect-ratio: 16 / 10; }
  .orthographic-card-portrait, .orthographic-card-square { aspect-ratio: auto; }
  .orthographic-card figcaption { min-height: 108px; padding: 18px 6px 10px; }
  .orthographic-card figcaption > span { font-size: 38px; }
  .orthographic-card figcaption b { font-size: 15px; }
  .orthographic-card figcaption small { font-size: 15px; }

  .demo-grid { display: block; }
  .demo-stage { position: sticky; top: 92px; z-index: 3; height: 56vh; min-height: 430px; margin-bottom: 35px; }
  .demo-model { inset: 0 0 8%; }
  .demo-capture-zone { left: 32%; width: 46%; }
  .tower-demo { left: 56%; transform: translate(-50%,-50%) scale(.74); }
  .stage-copy { left: 34px; bottom: 24px; }.stage-count { top: 12px; }
  .demo-steps li { min-height: auto; opacity: 1; transform: none; }
  .demo-steps button { grid-template-columns: 50px 1fr; padding: 24px 0; }.demo-steps button > span { font-size: 25px; }.demo-steps p { max-height: 50px; margin-top: 5px; }

  .technology { padding-top: 92px; }
  .tech-heading { margin-bottom: 40px; }
  .tech-story { display: flex; flex-direction: column-reverse; gap: 26px; }
  .tech-stage { position: relative; top: auto; width: 100%; height: 560px; min-height: 0; }
  .tech-model { inset: 0 0 5%; }
  .tech-module-zone { left: 25%; right: 25%; }
  .tech-tower { transform: translate(-50%,-48%) scale(.84); }.hotspot i { width: 28px; }.hotspot { font-size: 5px; }
  .tech-list { width: 100%; }
  .tech-list li { min-height: auto; opacity: 1; transform: none !important; }
  .tech-list button { grid-template-columns: 48px 1fr; padding: 18px 0; }
  .tech-list li.active button { padding-left: 12px; background: rgba(255,255,255,.05); }
  .tech-list h3 { font-size: 21px; }.tech-list p { display: none; }

  .impact-heading { margin-bottom: 38px; }
  .scenario-story { display: block; }
  .scenario-stage { position: relative; top: auto; height: 62vw; min-height: 430px; max-height: 560px; }
  .scenario-airflow { width: 60%; }
  .scenario-steps { display: grid; grid-auto-flow: column; grid-auto-columns: 84%; gap: 14px; overflow-x: auto; scroll-snap-type: x mandatory; padding-top: 20px; scrollbar-width: none; }.scenario-steps::-webkit-scrollbar { display: none; }
  .scenario-steps li { min-height: 180px; opacity: 1; scroll-snap-align: start; border: 1px solid var(--line); padding: 0 18px; }.scenario-steps li.active { transform: none; background: rgba(255,255,255,.55); }
  .scenario-steps button { border: 0; grid-template-columns: 45px 1fr; }.scenario-steps button > span { font-size: 23px; }
  .metrics-bar { grid-template-columns: 1fr 1fr; }.metrics-bar > p { grid-column: 1/-1; }.metrics-bar > * { border-bottom: 1px solid var(--line); }

  .roadmap { min-height: 0; }
  .timeline li { grid-template-columns: 52px 1fr; gap: 18px; min-height: 0; padding: 0 0 65px; }.node { width: 50px; height: 50px; }.timeline-track { left: 25px; top: 25px; bottom: 100px; }.timeline-copy h3 { font-size: 22px; }.timeline-image { grid-column: 2; width: 100%; margin-top: 16px; }
  .team { min-height: 0; display: block; }.team-grid { grid-template-columns: 1fr; }.contact-card h3 { font-size: 25px; }.wordmark { bottom: -14px; }.wordmark span { font-size: 15px; }.wordmark b { font-size: clamp(38px,11vw,68px); }
  footer { flex-direction: column; align-items: flex-start; gap: 18px; }
}

@media (max-width: 480px) {
  .hero-visual { height: 450px; }.tower-hero { transform: translate(-50%,-47%) scale(.84); }
  .hero-product-fallback { object-position: center bottom; transform: scale(1.01); }
  .concept-card { aspect-ratio: 4 / 3; }
  .orthographic-card-portrait, .orthographic-card-square { aspect-ratio: auto; }
  .orthographic-card figcaption { min-height: 102px; }
  .concept-card img { object-position: center; }
  .callout i { width: 25px; }.callout { font-size: 5px; }
  .problem-grid { width: calc(100% - 36px); }
  .demo-stage { min-height: 410px; }.tower-demo { transform: translate(-50%,-50%) scale(.67); }
  .stage-copy { left: 28px; max-width: 180px; }.stage-copy strong { font-size: 20px; }.stage-copy p { font-size: 8px; }
  .tech-stage { height: 510px; }.tech-tower { transform: translate(-50%,-48%) scale(.72); }
  .hotspot span { display: none; }.hotspot i { width: 20px; }
  .scenario-stage { min-height: 390px; }.scene-condition { display: none; }
  .scenario-airflow { left: 0; width: 64%; }
  .metrics-bar { grid-template-columns: 1fr; }.metrics-bar > p { grid-column: auto; }
  .timeline-image { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
  .hero-copy, .hero-visual, .hero-meta { transform: none; opacity: 1; }
  .windora-viewer { transform: none; }
  .dust-field i { transform: none; }
}