:root {
  color-scheme: dark;
  --bg: #0b0c0e;
  --surface: #101114;
  --text: #f0f0f1;
  --muted: #a0a2a9;
  --line: #ffffff20;
  --accent: #e56b65;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 36px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.65 -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
a, button { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, [tabindex='0']:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }
a:hover { color: #fff; }
h1, h2, h3, p, figure { margin: 0; }
.wrap { width: min(1160px, calc(100% - 96px)); margin: 0 auto; }
.skip { position: fixed; left: 20px; top: -100px; z-index: 100; background: #fff; color: #111; padding: 10px 18px; }
.skip:focus { top: 14px; }
.topbar { min-height: 92px; display: flex; justify-content: space-between; align-items: center; gap: 32px; border-bottom: 1px solid var(--line); position: relative; }
.brand { display: flex; align-items: center; gap: 11px; font-size: 17px; font-weight: 550; letter-spacing: -.35px; }
.brand-record { width: 19px; height: 19px; border: 1px solid #ffffff7a; border-radius: 50%; position: relative; flex-shrink: 0; }
.brand-record:after { content: ''; position: absolute; inset: 4px; border-radius: 50%; background: #ff3338; }
.nav { display: flex; align-items: center; gap: 31px; font-size: 12px; color: var(--muted); }
.nav a { padding: 10px 0; }
.nav a:hover { color: #fff; }
.menu { display: none; padding: 8px 14px; border: 1px solid var(--line); border-radius: 5px; color: var(--text); background: transparent; }
.eyebrow { font-size: 10px; font-weight: 500; letter-spacing: 1.8px; color: var(--muted); }
.eyebrow > span:not(.chapter-no) { color: #5c5e64; margin: 0 8px; }
.hero { padding-top: 68px; padding-bottom: 76px; }
.hero-intro { display: grid; grid-template-columns: 1.4fr .8fr; gap: 70px; align-items: end; }
h1 { margin-top: 28px; font-size: clamp(60px, 7.5vw, 102px); font-weight: 480; line-height: 1.02; letter-spacing: -5.5px; }
h1 span { color: #a4a5ab; }
.hero-summary { padding-bottom: 6px; max-width: 310px; }
.hero-summary > p { font-size: 15px; line-height: 1.85; color: #b4b6bd; }
.quiet-link { display: inline-flex; align-items: center; gap: 32px; font-size: 11px; margin-top: 25px; padding-bottom: 8px; border-bottom: 1px solid #696b72; }
.quiet-link span { font-size: 16px; }
.release-link, .button { display: inline-flex; justify-content: center; align-items: center; gap: 20px; padding: 12px 20px; background: #f1f1f1; color: #111; font-size: 12px; font-weight: 600; border: 1px solid #f1f1f1; border-radius: 5px; }
.release-link { margin-top: 24px; font-family: inherit; }
.release-link:disabled { opacity: .5; cursor: default; }
.release-link:disabled:hover { background: #f1f1f1; color: #111; }
.release-link:hover, .button:hover { background: #fff; color: #000; }
.hero-visuals { display: grid; grid-template-columns: minmax(0, 2.04fr) minmax(0, 1fr); align-items: start; gap: 32px; max-width: 1100px; margin: 56px auto 0; }
.hero-device { margin: 0; min-width: 0; }
.folded-device { width: 100%; max-width: 350px; margin: 0; justify-self: end; min-width: 0; }
.duo-hardware { position: relative; width: calc(100% - 7px); margin-left: 7px; padding-left: 8px; aspect-ratio: 841 / 1178; }
.phone-frame { position: relative; z-index: 1; display: block; width: 100%; height: 100%; padding: 7px 7px 7px 4px; border: 2px solid #9a9b9e; border-left-color: #66686c; border-radius: 5px 45px 45px 5px; background: #121315; box-shadow: inset 0 0 0 1px #3f4248, 0 18px 38px #00000055; overflow: hidden; }
.phone-frame img { display: block; width: 100%; height: 100%; object-fit: contain; background: #000; border-radius: 1px 35px 35px 1px; }
.duo-hinge { position: absolute; z-index: 0; left: 0; top: 5px; bottom: 3px; width: 12px; border: 1px solid #a6a6aa; border-left: 2px solid #c0c0c1; border-right: 2px solid #34363a; border-radius: 6px 1px 1px 6px; background: #66676c; box-shadow: -3px 2px 0 0 #2f3034, -4px 2px 0 0 #828388; }
.duo-top-keys { position: absolute; top: -2px; left: 48%; width: 31%; height: 3px; }
.duo-top-keys:before, .duo-top-keys:after { content: ''; position: absolute; top: 0; width: 43%; height: 3px; border: 1px solid #9a9b9e; border-radius: 2px 2px 0 0; background: #55575e; }
.duo-top-keys:before { left: 0; }
.duo-top-keys:after { right: 0; }
.duo-side-key { position: absolute; right: -2px; top: 29%; width: 3px; height: 16%; border: 1px solid #9a9b9e; border-radius: 0 2px 2px 0; background: #484b52; }
.duo-camera { position: absolute; z-index: 2; top: 6.5%; right: 7.5%; width: 7.2%; aspect-ratio: 1; border: 3px solid #060709; border-radius: 50%; background: #000; box-shadow: 0 0 0 1px #0d1016; pointer-events: none; }
.duo-camera:after { content: ''; position: absolute; inset: 27%; border-radius: 50%; background: #0b1020; border: 1px solid #171c29; }
.screen-frame { display: block; background: #000; border: 1px solid #34363c; border-radius: 20px; padding: 7px; overflow: hidden; }
.screen-frame img { display: block; width: 100%; height: auto; border-radius: 14px; }
.chapter { padding-top: 100px; padding-bottom: 100px; }
.chapter-heading { display: grid; grid-template-columns: .7fr 1.4fr; gap: 80px; margin-bottom: 55px; }
.chapter-heading > .eyebrow { padding-top: 12px; }
.chapter-no { font: 10px ui-monospace, SFMono-Regular, monospace; color: #747780; display: inline-block; margin-right: 15px; }
h2 { font-size: clamp(36px, 4.2vw, 58px); line-height: 1.09; font-weight: 450; letter-spacing: -2.2px; }
.section-copy { font-size: 15px; color: #a9abb3; line-height: 1.9; max-width: 450px; margin-top: 23px; }
.capture { border-top: 1px solid var(--line); }
.capture-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 25px 0 28px; }
.capture-facts > div { display: flex; flex-direction: column; gap: 8px; }
.fact-title { font-size: 25px; font-weight: 450; letter-spacing: -.7px; }
.fact-note { font-size: 11px; color: var(--muted); }
.fine-print { font-size: 11px; line-height: 1.8; color: #91949d; margin-top: 20px; }
.fine-print a { text-decoration: underline; text-underline-offset: 3px; }
.fold-section { background: var(--surface); border-top: 1px solid #ffffff0e; border-bottom: 1px solid #ffffff0e; }
.pose-tabs { display: flex; justify-content: center; gap: 48px; margin-bottom: 36px; border-bottom: 1px solid var(--line); }
.pose-tabs button { border: 0; border-bottom: 1px solid transparent; margin-bottom: -1px; padding: 16px 0; color: #9b9da6; background: transparent; font-size: 12px; cursor: pointer; }
.pose-tabs button:hover { color: #fff; }
.pose-tabs button[aria-selected='true'] { color: #fff; border-bottom-color: var(--accent); }
.pose-screen { height: 540px; display: flex; justify-content: center; align-items: center; }
.pose-screen a { display: flex; max-width: 100%; height: 100%; align-items: center; justify-content: center; }
.pose-screen img { display: block; max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; border: 1px solid #383a40; border-radius: 15px; background: #000; }
.pose-panel:not([hidden]) { animation: screen-in .18s ease-out; }
@keyframes screen-in { from { opacity: .5; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
.clean-section { display: grid; grid-template-columns: 1fr 1.1fr; gap: 85px; align-items: center; }
.clean-copy > .eyebrow { margin-bottom: 28px; }
.clean-section h2 { font-size: clamp(34px, 3.6vw, 49px); }
.gesture-note { color: #bfc1c8; font-size: 11px; margin-top: 25px; padding-left: 14px; border-left: 1px solid #60626b; max-width: 330px; line-height: 1.85; }
.technical { border-top: 1px solid var(--line); display: grid; grid-template-columns: 1fr 1.55fr; gap: 80px; align-items: start; }
.technical-heading .eyebrow { margin-bottom: 28px; }
.technical-heading h2 { font-size: 44px; }
.capability-list { margin: 0; }
.capability-list > div { display: grid; grid-template-columns: 135px 1fr; gap: 25px; padding: 21px 0; border-top: 1px solid var(--line); }
.capability-list > div:last-child { border-bottom: 1px solid var(--line); }
.capability-list dt { font-size: 12px; color: #dfdfe3; }
.capability-list dd { margin: 0; font-size: 12px; line-height: 1.85; color: #9b9ea8; }
.technical-limit { grid-column: 2; margin-top: -51px; }
.footer-main { display: flex; gap: 55px; align-items: flex-start; justify-content: space-between; padding: 42px 0; border-top: 1px solid var(--line); }
.footer-brand { font-size: 22px; font-weight: 500; letter-spacing: -.6px; }
.footer-contact { color: #a4a7af; font-size: 12px; margin-top: 10px; }
.footer-contact a { overflow-wrap: anywhere; }
.footer-links { display: grid; grid-template-columns: 1fr 1fr; gap: 11px 36px; font-size: 11px; color: var(--muted); }
.footer-links a:hover, .footer-contact a:hover, .coffee-link:hover { color: #fff; }
.coffee-link { font-size: 11px; color: var(--muted); padding-bottom: 6px; border-bottom: 1px solid #4f525b; }
.footer-bottom { display: flex; justify-content: space-between; align-items: flex-start; gap: 30px; border-top: 1px solid #ffffff0c; padding: 20px 0 28px; color: #92959f; font-size: 10px; }
.document-header { padding-top: 46px; padding-bottom: 35px; border-bottom: 1px solid var(--line); }
.back { font-size: 12px; color: var(--muted); }
.document-header h1 { margin: 26px 0 16px; font-size: clamp(36px, 5vw, 56px); letter-spacing: -2px; }
.document-header p { max-width: 620px; font-size: 14px; color: var(--muted); }
.document-header .updated { margin-top: 18px; font-size: 11px; }
.document-layout { display: grid; grid-template-columns: 190px minmax(0, 740px); gap: 80px; padding-top: 45px; padding-bottom: 90px; }
.toc { position: sticky; top: 30px; align-self: start; display: flex; flex-direction: column; gap: 14px; font-size: 12px; color: var(--muted); }
.toc a:hover { color: #fff; }
.prose section + section { margin-top: 36px; }
.prose h2 { font-size: 22px; line-height: 1.4; letter-spacing: -.5px; margin-bottom: 13px; }
.prose p, .prose li { color: #b0b3bc; font-size: 14px; line-height: 1.9; margin-bottom: 14px; }
.prose ul { margin: 0 0 14px; padding-left: 20px; }
.prose a { text-decoration: underline; text-underline-offset: 3px; overflow-wrap: anywhere; color: #d5d7de; }
.prose a.button { text-decoration: none; color: #111; }
.notice { padding: 14px 18px; background: #15171b; border-left: 1px solid #656975; margin-bottom: 34px !important; }
.identity { width: 100%; border-collapse: collapse; font-size: 13px; }
.identity caption { text-align: left; color: var(--muted); font-size: 11px; padding-bottom: 10px; }
.identity td, .identity th { border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; padding: 15px 0; overflow-wrap: anywhere; }
.identity th { width: 46%; font-weight: 400; color: var(--muted); padding-right: 20px; }
.error-page { padding-top: 65px; padding-bottom: 100px; }
.error-page h1 { font-size: 48px; letter-spacing: -2px; margin-bottom: 24px; }
.error-page > p { color: var(--muted); }
.text-link { display: inline-block; text-decoration: underline; text-underline-offset: 5px; margin-top: 24px; font-size: 12px; }
::selection { color: #fff; background: #773c3b; }
@media (max-width: 1000px) {
  .wrap { width: calc(100% - 64px); }
  .hero-intro { gap: 38px; }
  h1 { font-size: 77px; letter-spacing: -4px; }
  .hero-summary { max-width: 270px; }
  .chapter-heading { gap: 45px; grid-template-columns: .65fr 1.4fr; }
  .clean-section { gap: 40px; }
  .technical { gap: 40px; grid-template-columns: .8fr 1.5fr; }
  .capability-list > div { grid-template-columns: 115px 1fr; gap: 20px; }
  .pose-screen { height: 490px; }
  .document-layout { gap: 45px; grid-template-columns: 170px 1fr; }
}
@media (max-width: 700px) {
  .wrap { width: calc(100% - 40px); }
  .topbar { min-height: 76px; }
  .brand { font-size: 16px; }
  .brand-record { width: 17px; height: 17px; }
  .menu { display: block; font-size: 12px; }
  .nav { display: none; position: absolute; top: 75px; left: -20px; right: -20px; background: var(--bg); border-bottom: 1px solid var(--line); padding: 22px 20px; z-index: 20; }
  .nav.is-open { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
  .hero { padding-top: 42px; padding-bottom: 52px; }
  .hero-intro { display: block; }
  .hero .eyebrow { font-size: 8px; letter-spacing: 1.2px; }
  h1 { font-size: clamp(50px, 10vw, 70px); letter-spacing: -2.7px; margin-top: 24px; }
  .desktop-break { display: none; }
  .hero-summary { max-width: 380px; margin-top: 26px; padding: 0; }
  .hero-summary > p { font-size: 13px; }
  .quiet-link { margin-top: 20px; }
  .hero-visuals { margin-top: 32px; gap: 13px; }
  .duo-hardware { width: calc(100% - 4px); margin-left: 4px; padding-left: 4px; }
  .phone-frame { padding: 3px 3px 3px 2px; border-width: 1px; border-radius: 3px 16px 16px 3px; }
  .phone-frame img { border-radius: 1px 12px 12px 1px; }
  .duo-hinge { width: 6px; top: 2px; bottom: 1px; border-left-width: 1px; border-right-width: 1px; border-radius: 3px 0 0 3px; box-shadow: -1px 1px 0 0 #2f3034, -2px 1px 0 0 #828388; }
  .duo-top-keys, .duo-top-keys:before, .duo-top-keys:after { height: 2px; }
  .duo-top-keys { top: -1px; }
  .duo-side-key { width: 2px; right: -1px; }
  .duo-camera { border-width: 1px; }
  .duo-camera:after { border: 0; }
  .screen-frame { padding: 4px; border-radius: 13px; }
  .screen-frame img { border-radius: 9px; }
  .chapter { padding-top: 62px; padding-bottom: 62px; }
  .chapter-heading { display: block; margin-bottom: 32px; }
  .chapter-heading > .eyebrow { margin-bottom: 26px; padding-top: 0; }
  .eyebrow { font-size: 8px; letter-spacing: 1.5px; }
  .chapter-no { font-size: 9px; margin-right: 10px; }
  h2 { font-size: 38px; letter-spacing: -1.5px; }
  .section-copy { font-size: 13px; margin-top: 20px; }
  .capture-facts { gap: 18px; padding: 23px 0; }
  .fact-title { font-size: 17px; letter-spacing: -.3px; }
  .fact-note { font-size: 9px; line-height: 1.8; }
  .fine-print { font-size: 10px; margin-top: 16px; }
  .pose-tabs { gap: 0; justify-content: space-between; margin-bottom: 26px; }
  .pose-tabs button { font-size: 10px; padding: 12px 0; }
  .pose-screen { height: 330px; }
  .pose-screen img { border-radius: 10px; }
  .clean-section { display: flex; flex-direction: column; align-items: stretch; gap: 30px; }
  .clean-section h2 { font-size: 38px; }
  .clean-copy > .eyebrow { margin-bottom: 25px; }
  .gesture-note { font-size: 10px; margin-top: 20px; }
  .technical { display: block; }
  .technical-heading { margin-bottom: 30px; }
  .technical-heading h2 { font-size: 38px; }
  .technical-heading .eyebrow { margin-bottom: 24px; }
  .capability-list > div { grid-template-columns: 105px 1fr; gap: 17px; padding: 18px 0; }
  .capability-list dt, .capability-list dd { font-size: 11px; }
  .technical-limit { margin-top: 23px; }
  .footer-main { display: grid; grid-template-columns: 1fr; gap: 26px; padding: 32px 0; }
  .footer-brand { font-size: 24px; }
  .footer-links { grid-template-columns: repeat(2, max-content); gap: 12px 38px; }
  .coffee-link { justify-self: start; font-size: 10px; }
  .footer-bottom { display: block; padding-top: 20px; font-size: 9px; line-height: 1.8; }
  .footer-bottom span { display: block; }
  .footer-bottom span + span { margin-top: 10px; }
  .document-header { padding-top: 30px; }
  .document-header h1 { font-size: 38px; letter-spacing: -1.5px; }
  .document-layout { display: block; padding-top: 26px; padding-bottom: 55px; }
  .toc { position: static; display: flex; flex-direction: row; flex-wrap: wrap; gap: 10px 20px; padding-bottom: 24px; margin-bottom: 29px; border-bottom: 1px solid var(--line); font-size: 11px; }
  .prose h2 { font-size: 21px; }
  .prose p, .prose li { font-size: 13px; }
  .identity { font-size: 12px; }
  .identity th { width: 45%; }
}
@media (max-width: 370px) {
  h1 { font-size: 48px; }
  .capture-facts { grid-template-columns: 1fr; gap: 20px; }
  .capture-facts > div { gap: 4px; }
  .pose-tabs button { font-size: 9px; }
  .pose-screen { height: 300px; }
  .capability-list > div { grid-template-columns: 1fr; gap: 7px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .pose-panel:not([hidden]) { animation: none; }
}