/* Hallmark · genre: modern-minimal · macrostructure: Feature Stack
 * theme: studied-DNA / Arka monochrome · studied: yes · DNA-source: url
 * source-url: https://nexus.cld9.ai/ · rhythm verified in desktop/mobile browser
 * Motion: product stages · staged type · tab crossfade. Native scrolling.
 * Pre-emit critique: P5 H5 E4 S5 R5 V4. */
:root{
 --header-height:72px;
 --story-gap:clamp(64px,9vw,144px);
 --story-rule:var(--color-rule);
}
html{scroll-padding-top:calc(var(--header-height) + 24px)}
.site-header{
 position:fixed;inset:0 0 auto;height:var(--header-height);
 grid-template-columns:auto 1fr auto;gap:40px;z-index:40;
 background:var(--color-paper);border-bottom:1px solid var(--story-rule);
}
.header-call{
 display:inline-flex;align-items:center;justify-content:center;justify-self:end;
 gap:10px;min-height:44px;padding:10px 20px;border-radius:999px;
 background:var(--color-ink);color:var(--color-paper);font-size:13px;
 transition:transform var(--dur-fast) var(--ease-out),background-color var(--dur-normal) var(--ease-out);
}
.header-call:hover{background:var(--color-light);color:var(--color-paper)}
.header-call:active{transform:translateY(1px)}
.header-call:focus-visible{outline:2px solid var(--color-focus);outline-offset:4px}
.reading-progress{position:absolute;inset:auto 0 -1px;height:2px;background:var(--color-ink);transform-origin:left;pointer-events:none}
.mobile-nav{position:fixed;top:var(--header-height);z-index:39;max-height:calc(100svh - var(--header-height));overflow-y:auto}

.hero-sequence{height:175svh;padding-top:var(--header-height);background:var(--color-paper)}
.hero-visual{
 position:sticky;top:var(--header-height);height:calc(100svh - var(--header-height));
 min-height:540px;max-height:none;display:grid;
 grid-template-rows:auto minmax(0,1fr) auto auto;gap:16px;
 padding:24px 32px 20px;overflow:clip;
}
.hero-visual .hero-brand{position:relative;inset:auto;z-index:1;line-height:0}
.hero-visual .hero-brand .arka-logo-frame{width:clamp(180px,18vw,260px);height:auto;aspect-ratio:1821 / 519}
.hero-visual .hero-canvas{position:relative;inset:auto;min-height:0;width:100%;height:100%}
.hero-visual .hero-copy{position:relative;inset:auto;max-width:none;transform:none;gap:18px}
.hero-visual .hero-title{font-size:clamp(32px,3.5vw,52px)!important;margin:0!important;line-height:1.08!important}
.hero-visual .primary-action{margin:0;min-height:44px}
.hero-visual .hero-bottom{position:relative;inset:auto;gap:12px;align-items:center;justify-content:space-between;width:100%;font-size:10px}
.hero-visual .hero-bottom>span:first-child{text-align:left}
.hero-visual .hero-bottom .hero-scroll-hint{display:flex;align-items:center;gap:10px;white-space:nowrap;font-size:11px}
.chapter-index{padding-block:28px;margin-top:0;border-bottom:1px solid var(--story-rule)!important}

.opening-story{padding-block:var(--story-gap)}
.opening-story h2{max-width:none;font-size:clamp(44px,8.4vw,120px);line-height:1.04;letter-spacing:-.055em}
.statement-word{display:inline-block;white-space:pre}
.opening-story .opening-bottom{margin-top:56px}
.opening-story .opening-note{margin:0;max-width:620px;text-align:left}
.opening-story .discovery-count{justify-content:flex-start}
.opening-story .discovery-count p{font-size:26px}
.opening-story .discovery-count p span{font-size:14px}
.reveal-word>span{will-change:auto}

.software-showcase{overflow:clip}
.software-tour{position:relative}
.software-product{perspective:none;width:100%;margin-inline:auto}
.software-display{transform:none!important}
.software-masthead .text-action{min-height:44px}
.software-switcher button{position:relative;overflow:hidden}
.software-switcher button::after{
 content:'';position:absolute;bottom:0;left:18px;right:18px;height:2px;
 background:currentColor;transform:scaleX(0);transform-origin:left;
 transition:transform var(--dur-normal) var(--ease-out);
}
.software-switcher button[aria-selected=true]::after{transform:scaleX(1)}
.software-footnote{min-height:150px}

.material-study{border-block:1px solid var(--story-rule)}
.material-copy h2{font-size:clamp(44px,7vw,100px)}
.anatomy .section-heading{padding-top:var(--story-gap)}
.anatomy .section-heading h2,.technology h2{font-size:clamp(38px,5.2vw,76px)}
.assembly-sequence{height:190svh}
.assembly-sticky{top:var(--header-height);height:calc(100svh - var(--header-height));min-height:540px}
.hardware-section{padding-block:var(--story-gap)}
.hardware-section .architecture-heading h2{font-size:clamp(36px,4.8vw,68px)}
.investor-section{padding-block:var(--story-gap)}
.investor-action{min-height:48px}

@media(min-width:1000px) and (min-height:650px) and (prefers-reduced-motion:no-preference){
 .software-showcase{height:240svh;padding:0}
 .software-tour{
  position:sticky;top:var(--header-height);height:calc(100svh - var(--header-height));
  display:grid;grid-template-columns:minmax(0,.72fr) minmax(0,1.28fr);
  align-items:center;gap:clamp(32px,4vw,72px);padding-block:28px;
 }
 .software-masthead{text-align:left}
 .software-masthead h2{font-size:clamp(64px,7.5vw,108px)}
 .software-statement{font-size:clamp(23px,2.2vw,32px);max-width:440px}
 .software-masthead .chapter-label{margin-bottom:28px}
 .software-product{margin-top:0;max-width:none}
 .software-switcher{margin-bottom:20px}
 .software-display{max-width:calc(48svh * 1.6);margin-inline:auto}
 .software-footnote{min-height:142px;display:block;margin-top:20px}
 .software-footnote h3{font-size:20px}
 .software-footnote div p{font-size:13px;line-height:1.65;margin-top:10px}
 .software-disclosure{text-align:left;font-size:10px;margin-top:14px;padding:0}
}
@media(max-width:999px){
 .site-header{gap:24px;padding-inline:24px}
 .desktop-nav{gap:20px}
 .software-tour{max-width:780px}
}
@media(max-width:760px){
 :root{--header-height:64px;--story-gap:72px}
 .site-header{display:grid;grid-template-columns:minmax(0,1fr) auto auto;gap:8px;padding-inline:16px}
 .site-header .arka-logo-frame{width:88px}
 .site-header .header-call{display:inline-flex;font-size:12px;gap:6px;padding:10px 12px}
 .site-header .header-call svg{width:14px;height:14px}
 .site-header>.icon-button{width:44px;height:44px}
 .hero-sequence{height:145svh}
 .hero-visual{height:calc(100svh - var(--header-height));min-height:480px;padding:16px 16px 14px;gap:14px}
 .hero-visual .hero-brand .arka-logo-frame{width:154px;height:auto}
 .hero-visual .hero-canvas{inset:auto}
 .hero-visual .hero-copy{gap:16px}
 .hero-visual .hero-title{font-size:clamp(26px,7.1vw,34px)!important;margin:0!important}
 .hero-visual .hero-bottom{justify-content:center;font-size:9px;line-height:1.5}
 .hero-visual .hero-bottom>span:first-child{text-align:center;max-width:310px}
 .hero-visual .hero-bottom .hero-scroll-hint{display:none}
 .chapter-index{padding-block:20px;gap:8px}
 .opening-story h2{font-size:clamp(40px,10vw,66px);line-height:1.08}
 .opening-story h2 br{display:block}
 .opening-story .opening-bottom{gap:28px;margin-top:36px}
 .opening-story .discovery-count p{font-size:23px}
 .opening-story .opening-note p{font-size:16px}
 .software-showcase{padding-block:64px}
 .software-product{max-width:520px}
 .software-footnote{min-height:230px}
 .material-copy h2{font-size:48px}
 .section-heading{display:flex;flex-direction:column;align-items:flex-start;gap:24px}
 .assembly-sequence{height:155svh}
 .assembly-sticky{position:sticky;top:var(--header-height);height:calc(100svh - var(--header-height));min-height:540px;max-height:780px}
 .hardware-section .architecture-heading h2{font-size:clamp(34px,8.5vw,52px)}
 .technology h2{font-size:clamp(36px,8.8vw,54px)}
 .lab-evidence h2{font-size:clamp(36px,8.5vw,52px)}
 .component-figure{scroll-margin-top:calc(var(--header-height) + 24px)}
}
@media(max-width:360px){
 .site-header{padding-inline:12px;gap:6px}
 .site-header .arka-logo-frame{width:78px}
 .site-header .header-call{font-size:11px;padding-inline:10px}
 .opening-story h2{font-size:39px}
 .hero-visual .hero-brand .arka-logo-frame{width:140px}
}
@media(max-height:649px){
 .hero-sequence{height:auto}
 .hero-visual{position:relative;top:auto;height:max(480px,calc(100svh - var(--header-height)));min-height:0}
 .hero-visual .hero-canvas{inset:auto}
 .assembly-sequence{height:auto}
 .assembly-sticky{position:relative;top:auto;height:620px;min-height:0}
}
@media(min-width:761px) and (max-height:649px){
 .hero-visual{height:max(320px,calc(100svh - var(--header-height)));grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);grid-template-rows:auto minmax(0,1fr) auto;padding:16px 24px}
 .hero-visual .hero-brand{grid-column:1;grid-row:1}
 .hero-visual .hero-brand .arka-logo-frame{width:150px}
 .hero-visual .hero-canvas{grid-column:2;grid-row:1 / -1}
 .hero-visual .hero-copy{grid-column:1;grid-row:2;justify-content:center;gap:16px}
 .hero-visual .hero-title{font-size:28px!important}
 .hero-visual .hero-bottom{grid-column:1;grid-row:3;font-size:9px;justify-content:center}
 .hero-visual .hero-bottom>span:first-child{text-align:center}
 .hero-visual .hero-bottom .hero-scroll-hint{display:none}
}
@media(prefers-reduced-motion:reduce){
 .hero-sequence{height:auto}
 .hero-visual{position:relative;top:auto}
 .assembly-sequence{height:auto}
 .assembly-sticky{position:relative;top:auto}
 .statement-word{opacity:1!important;transform:none!important}
 .material-study>img{transform:none!important}
 .header-call,.software-switcher button::after{transition:none}
}
html:not(.js-ready) .hero-sequence,html:not(.js-ready) .assembly-sequence{height:auto}
html:not(.js-ready) .hero-visual,html:not(.js-ready) .assembly-sticky{position:relative;top:auto}
html:not(.js-ready) .statement-word{opacity:1!important;transform:none!important}
html:not(.js-ready) .software-showcase{height:auto;padding-block:64px}
html:not(.js-ready) .software-tour{position:relative;top:auto;height:auto}