/* Adam Robotics — restrained, image-led product presentation. */
:root {
  --ink: #17191c;
  --muted: #656970;
  --brand: #006dcc;
  --paper: #f5f5f7;
  --canvas: #ffffff;
  --surface: #ffffff;
  --line: #e2e3e5;
  --maxw: 1280px;
  --pad: 40px;
  --nav-height: 68px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body { margin: 0; color: var(--ink); background: var(--canvas); font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif; font-size: 16px; line-height: 1.75; -webkit-font-smoothing: antialiased; }
body.qr-viewer-lock, body.video-viewer-lock { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { display: block; max-width: 100%; }
h1, h2, h3, h4, p { margin: 0; }
.en { font-family: 'Avenir Next', 'Helvetica Neue', Arial, sans-serif; }
.wrap { width: min(var(--maxw), calc(100% - var(--pad) * 2)); margin-inline: auto; }
section { padding: 112px 0; scroll-margin-top: 0; }
:focus-visible { outline: 3px solid #258ce5; outline-offset: 5px; }
.sec-head { margin-bottom: 52px; text-align: center; }
.kicker { display: block; color: var(--muted); font-size: 14px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; margin-bottom: 14px; }
.sec-head h2, .join h2 { font-size: clamp(32px, 3.8vw, 52px); line-height: 1.3; font-weight: 600; letter-spacing: -.035em; }
.sec-head p { margin: 20px auto 0; max-width: 720px; color: var(--muted); }
.btns { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; }
.btn { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 12px; padding: 9px 24px; font-size: 16px; line-height: 1.5; border-radius: 30px; border: 1px solid transparent; transition: background .2s, color .2s, border-color .2s; }
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #383b40; }
.btn-ghost { padding-inline: 8px; }
.btn-ghost:hover { text-decoration: underline; text-underline-offset: 5px; }
.btn-outline { border-color: #babdc2; }
.btn-outline:hover { background: #e8e9eb; }
/* Compact, persistent navigation. */
.nav { position: sticky; top: 0; z-index: 50; margin-bottom: calc(-1 * var(--nav-height)); color: var(--ink); transition: background .25s ease, box-shadow .25s ease, color .25s ease; background: rgba(255,255,255,.94); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px); border: 0; box-shadow: inset 0 -1px 0 rgba(0,0,0,.07); }
.nav .inner { max-width: 1440px; margin: auto; padding: 0 var(--pad); height: var(--nav-height); min-height: var(--nav-height); display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: center; flex-shrink: 0; gap: 15px; }
.brand-logo { width: 120px; height: auto; flex-shrink: 0; }
.brand-school { font-size: 12px; color: var(--muted); border-left: 1px solid #d5d6d8; padding-left: 15px; }
.nav ul { display: flex; gap: 26px; align-items: center; list-style: none; padding: 0; margin: 0; }
.nav ul a { display: block; font-size: 14px; color: #50545a; padding-block: 20px; transition: color .2s; white-space: nowrap; }
.nav ul a:hover, .nav ul a[aria-current] { color: var(--brand); }
.nav ul a.nav-cta { padding: 6px 18px; background: #17191c; color: #fff; border-radius: 24px; }
.nav ul a.nav-cta:hover { background: #383b40; }
.burger { display: none; background: none; border: 0; width: 44px; height: 44px; padding: 10px; cursor: pointer; }
.burger span { display: block; height: 1.5px; background: var(--ink); margin: 5px 0; transition: transform .2s, opacity .2s; }
/* Transparent over the opening film; an opaque surface after scrolling or opening the menu. */
.nav-mobile-join { display: none; }
.nav .brand-logo { transition: filter .25s ease; }
.nav:not(.is-scrolled):not(.menu-open) { background: transparent; box-shadow: none; backdrop-filter: none; -webkit-backdrop-filter: none; color: #fff; }
.nav:not(.is-scrolled):not(.menu-open) .brand-logo { filter: invert(1); }
.nav:not(.is-scrolled):not(.menu-open) .brand-school { color: #ffffffd9; border-color: #ffffff55; }
.nav:not(.is-scrolled):not(.menu-open) ul a { color: #fff; }
.nav:not(.is-scrolled):not(.menu-open) ul a.nav-cta { background: #fff; color: var(--ink); }
.nav:not(.is-scrolled):not(.menu-open) .burger span { background: #fff; }
/* The hero video keeps its original 16:9 framing while the section crops only the top/bottom letterbox area. */
.hero { --hero-video-full-h: calc(100vw * 9 / 16); --hero-video-crop-y: clamp(18px, 3.8vw, 64px); position: relative; height: calc(var(--hero-video-full-h) - var(--hero-video-crop-y) * 2); overflow: hidden; padding: calc(54px + var(--nav-height)) var(--pad) 0; color: #fff; text-align: center; background: #0e1013; display: flex; flex-direction: column; }
.hero::before { content: ''; position: absolute; inset: 0; z-index: 1; background: linear-gradient(180deg, rgba(5,7,10,.72) 0%, rgba(5,7,10,.5) 28%, rgba(5,7,10,.12) 65%, rgba(5,7,10,.5) 100%); pointer-events: none; }
.hero .inner { position: relative; z-index: 2; max-width: 850px; margin: clamp(0px, 1.5vh, 18px) auto 0; transform: translateY(clamp(-42px, -3vw, -18px)); }
.hero-video-bg { position: absolute; top: calc(var(--hero-video-crop-y) * -1); left: 0; width: 100%; height: var(--hero-video-full-h); object-fit: contain; object-position: center; filter: brightness(.96); }
.badge { font-size: 13px; font-weight: 500; color: #b8bcc2; letter-spacing: .2em; margin-bottom: 10px; }
.hero h1 { line-height: 1.1; font-weight: 500; }
.hero-logo { width: clamp(235px, 29vw, 420px); max-width: 100%; height: auto; margin: 14px auto 18px; }
.slogan { font-size: clamp(18px, 2vw, 25px); line-height: 1.45; margin-top: 14px; font-weight: 600; }
.hero .btns { justify-content: center; margin-top: 23px; }
.hero-video-open { display: none; }
.hero .btn-primary, .join .btn-primary { background: #fff; color: #15171a; }
.hero .btn-primary:hover, .join .btn-primary:hover { background: #dce0e5; }
.hero-caption { position: relative; z-index: 2; width: min(1360px, 100%); margin: auto auto 0; padding: 22px 0; display: flex; justify-content: space-between; color: #c4c8ce; font-size: 13px; border-top: 1px solid #ffffff26; }
.hero-caption a:hover { color: #fff; }
.hero-caption a span { margin-left: 16px; }
/* Large, quietly animated milestones. */
.stats { padding: 64px var(--pad); background: var(--canvas); }
.stats .grid { max-width: var(--maxw); margin: auto; display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); }
.stat { text-align: center; padding: 10px 20px; border-right: 1px solid var(--line); }
.stat:last-child { border: 0; }
.stat .num { font-size: clamp(40px, 4vw, 56px); line-height: 1.1; font-weight: 600; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.stat .num small { font-size: .44em; font-weight: 500; letter-spacing: 0; }
.stat p { color: var(--muted); font-size: 14px; margin-top: 14px; }
/* Full-width product collection, paired tiles rather than small cards. */
#robots { background: var(--canvas); padding: 82px 0 16px; }
#robots .wrap { width: calc(100% - 32px); max-width: 1680px; }
#robots .sec-head { padding-inline: 16px; }
.robot-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; }
.rcard { display: flex; flex-direction: column; min-width: 0; background: radial-gradient(ellipse at 50% 40%, #ffffff 0%, #f4f5f6 56%, #e9ebed 100%); color: var(--ink); border-radius: 8px; overflow: hidden; }
.rcard .body { order: -1; text-align: center; padding: 40px 24px 0; }
.rcard h3 { font-size: clamp(26px, 2.5vw, 36px); font-weight: 500; line-height: 1.4; letter-spacing: -.025em; }
.rcard .label { color: var(--muted); font-size: 16px; margin-top: 7px; }
.rcard .pic { position: relative; isolation: isolate; height: clamp(280px, 32vw, 470px); margin: 16px 0 28px; padding: 18px 36px; display: flex; justify-content: center; align-items: center; }
.rcard .pic img { position: relative; z-index: 1; width: 100%; height: 100%; object-fit: contain; filter: drop-shadow(0 10px 8px rgba(30,36,42,.12)); transition: transform .65s cubic-bezier(.2,.65,.3,1); }
/* A soft contact shadow anchors the transparent cutouts to the light stage. */
.rcard .pic::before { content: ''; position: absolute; z-index: 0; left: 22%; right: 22%; bottom: 10px; height: 22px; background: radial-gradient(ellipse, rgba(39,46,54,.16), rgba(39,46,54,0) 70%); pointer-events: none; }
@media (hover: hover) { .rcard:hover .pic img { transform: scale(1.035); } }
/* Editorial team story and uncropped group portrait. */
#about { padding-bottom: 0; }
.about-copy { display: grid; grid-template-columns: 1fr 1.15fr; gap: 24px 80px; padding-bottom: 64px; }
.about-copy .sec-head { grid-row: span 3; text-align: left; margin: 0; }
.about-copy > p { color: var(--muted); line-height: 1.95; }
.glory { border-top: 1px solid var(--line); padding-top: 24px; }
.glory .t { font-size: 22px; font-weight: 600; }
.glory p { margin-top: 9px; color: var(--muted); font-size: 14px; }
.glory b { color: var(--ink); font-weight: 500; }
.about-media { margin-inline: calc(50% - 50vw); }
.team-photo img { width: 100%; height: auto; }
/* Divisions retain their useful engineering detail. */
.groups { background: var(--paper); }
.group-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 20px; }
.gcard { background: var(--surface); padding: 40px; border-radius: 8px; }
.gcard .top { display: flex; align-items: center; gap: 18px; margin-bottom: 25px; }
.gcard .ic { width: 34px; height: 34px; flex-shrink: 0; color: #363b41; }
.gcard .ic svg { width: 100%; height: 100%; }
.gcard h3 { font-size: 27px; font-weight: 500; line-height: 1.4; }
.gcard .role { font-size: 13px; color: var(--muted); margin-top: 6px; }
.gcard .no { margin-left: auto; color: #c7cbd0; font-size: 34px; font-weight: 400; }
.gcard .desc { color: #50565d; font-size: 16px; line-height: 1.9; }
.gcard ul { padding: 22px 0 0 18px; margin: 24px 0 0; border-top: 1px solid #eceef0; color: var(--muted); font-size: 14px; line-height: 1.9; }
.gcard li + li { margin-top: 8px; }
/* Joining steps and native disclosure rows. */
.process { background: var(--canvas); }
.steps { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 44px 40px; list-style: none; margin: 0; padding: 0; }
.step { border-top: 1px solid #cbd0d5; padding-top: 24px; }
.step .no { color: #a3a8af; font-size: 44px; line-height: 1.1; }
.step-meta { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.step-time { color: var(--muted); font-size: 14px; line-height: 1.5; text-align: right; }
.step h4 { font-size: 22px; font-weight: 500; margin-top: 24px; }
.step p { font-size: 16px; color: var(--muted); margin-top: 12px; }
#faq { background: var(--paper); }
.faq-wrap { max-width: 900px; margin: auto; }
.faq { border-bottom: 1px solid #d9dde1; }
.faq:first-child { border-top: 1px solid #d9dde1; }
.faq summary { position: relative; cursor: pointer; padding: 25px 44px 25px 0; font-size: 18px; font-weight: 500; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '>'; position: absolute; right: 7px; top: 25px; color: #697078; font-size: 22px; font-weight: 300; line-height: 1; transform: rotate(0deg); transform-origin: 50% 50%; transition: transform .24s ease, color .2s ease; }
.faq.is-open summary::after, .faq:not(.faq-enhanced)[open] summary::after { transform: rotate(90deg); color: var(--ink); }
.faq .ans { max-height: 0; overflow: hidden; color: var(--muted); padding: 0 44px 0 0; line-height: 1.9; opacity: 0; transition: max-height .32s ease, opacity .24s ease, padding-bottom .32s ease; }
.faq.is-open .ans, .faq:not(.faq-enhanced)[open] .ans { max-height: 220px; padding-bottom: 25px; opacity: 1; }
.join { background: #17191d; color: #fff; }
.join-grid { display: grid; grid-template-columns: 1.2fr 1fr; align-items: center; gap: 90px; }
.join .kicker { color: #a8aeb7; }
.join h2 { font-size: clamp(38px, 4.8vw, 64px); line-height: 1.25; }
.join-copy p { margin-top: 26px; color: #b6bcc4; max-width: 540px; line-height: 1.9; }
.join .btns { margin-top: 32px; }
.join .btn-outline { border-color: #656b73; }
.join .btn-outline:hover { background: #32363d; }
/* Display-only crops: source JPEG bytes and every QR mark stay unchanged.
   QQ source: 1284 × 2283, square viewport (195,830,900,900).
   Douyin source: 1080 × 1575, square viewport (190,210,700,700).
   Source images scale uniformly; clipping removes only surrounding screenshot UI. */
.qr-cards { display: grid; grid-template-columns: minmax(0, 360px); justify-content: center; }
.qr-card { padding: 30px 26px 20px; text-align: center; background: #27272b; border: 1px solid #ffffff18; border-radius: 20px; }
.qr-eyebrow { display: block; font-size: 12px; letter-spacing: .16em; color: #aeb8c8; margin-bottom: 8px; }
.qr-title { font-size: 26px; font-weight: 500; line-height: 1.4; }
.qr-instruction { color: var(--muted); font-size: 14px; margin-top: 10px; }
.join .qr-instruction { color: #b6bcc4; }
.qr-crop { position: relative; display: block; aspect-ratio: 1; overflow: hidden; margin-inline: auto; }
.qr-crop img { position: absolute; max-width: none; height: auto; display: block; }
.qr-crop-qq { width: 100%; max-width: 288px; margin-top: 22px; margin-bottom: 18px; border-radius: 6px; }
.qr-crop-qq img { width: 142.666666667%; left: -21.666666667%; top: -92.222222222%; }
.qr-crop-douyin { width: min(100%, 248px); border-radius: 50%; }
.qr-crop-douyin img { width: 154.285714286%; left: -27.142857143%; top: -30%; }
.qr-account { font-size: 14px; color: var(--muted); margin-top: 8px; overflow-wrap: anywhere; }
.qr-account .en { font-size: 19px; font-weight: 500; letter-spacing: .035em; margin-left: 8px; }
.join .qr-account { color: #c1c6cd; }
.join .qr-account .en { color: #fff; }
.qr-original { display: inline-block; padding: 10px 0; font-size: 14px; color: var(--brand); text-underline-offset: 4px; }
.qr-original:hover { text-decoration: underline; }
.join .qr-original { color: #b9d9ff; }
.contact-pending { display: flex; flex-direction: column; align-items: center; gap: 12px; padding: 14px; text-align: center; color: #a8aeb7; font-size: 13px; }
.contact-pending .en { font-size: 32px; font-weight: 600; letter-spacing: .03em; }
.follow { background: var(--canvas); }
.follow-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); }
.fcard { text-align: center; padding: 20px 30px; border-right: 1px solid var(--line); }
.fcard:last-child { border: 0; }
.fic { width: 36px; height: 36px; margin: 0 auto 18px; color: #41464d; }
.fic svg { width: 100%; height: 100%; }
.fcard h3 { font-size: 21px; font-weight: 500; }
.fname { font-size: 14px; color: var(--muted); margin-top: 8px; }
.fqr { margin-top: 18px; }
.wechat-qr, .bilibili-qr { display: block; width: min(100%, 248px); margin-inline: auto; background: #fff; }
.wechat-qr img, .bilibili-qr img { width: 100%; height: auto; }
.fqr .contact-pending { gap: 0; color: #767c84; }
.fqr .contact-pending .en { display: none; }
.qr-viewer { position: fixed; inset: 0; z-index: 100; display: grid; place-items: center; padding: 24px; opacity: 0; pointer-events: none; transition: opacity .22s ease; }
.qr-viewer.is-open { opacity: 1; pointer-events: auto; }
.qr-viewer[hidden] { display: none; }
.qr-viewer-backdrop { position: absolute; inset: 0; border: 0; background: rgba(10,12,15,.78); cursor: zoom-out; }
.qr-viewer-panel { position: relative; z-index: 1; width: min(92vw, 520px); max-height: min(88vh, 720px); display: flex; flex-direction: column; background: #fff; box-shadow: 0 28px 70px #0000004d; }
.qr-viewer-head { min-height: 54px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 0 14px 0 20px; border-bottom: 1px solid var(--line); }
.qr-viewer-head h2 { font-size: 16px; font-weight: 500; line-height: 1.4; }
.qr-viewer-close { width: 40px; height: 40px; border: 0; border-radius: 50%; background: transparent; color: #4d535a; font-size: 28px; line-height: 1; cursor: pointer; }
.qr-viewer-close:hover { background: #f0f1f2; color: var(--ink); }
.qr-viewer-stage { flex: 1; min-height: 0; display: grid; place-items: center; padding: 22px; background: #fff; }
.qr-viewer-stage img { width: auto; max-width: 100%; height: auto; max-height: calc(min(88vh, 720px) - 98px); object-fit: contain; }
.video-viewer { position: fixed; inset: 0; z-index: 110; display: grid; place-items: center; padding: 18px; opacity: 0; pointer-events: none; transition: opacity .22s ease; }
.video-viewer.is-open { opacity: 1; pointer-events: auto; }
.video-viewer[hidden] { display: none; }
.video-viewer-backdrop { position: absolute; inset: 0; border: 0; background: rgba(4,6,9,.88); cursor: zoom-out; }
.video-viewer-panel { position: relative; z-index: 1; width: min(96vw, 1120px); max-height: calc(100dvh - 36px); display: flex; flex-direction: column; background: #05070a; box-shadow: 0 28px 80px #00000080; }
.video-viewer-head { min-height: 52px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 0 10px 0 18px; color: #fff; border-bottom: 1px solid #ffffff1f; }
.video-viewer-head h2 { font-size: 15px; font-weight: 500; line-height: 1.4; }
.video-viewer-close { width: 40px; height: 40px; border: 0; border-radius: 50%; background: transparent; color: #d4d7dc; font-size: 28px; line-height: 1; cursor: pointer; }
.video-viewer-close:hover { background: #ffffff17; color: #fff; }
.video-viewer video { display: block; width: 100%; height: auto; max-height: calc(100dvh - 88px); background: #000; aspect-ratio: 16 / 9; object-fit: contain; }
.footer { background: var(--paper); padding: 48px 0 32px; color: #686e76; }
.footer .wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 24px; }
.footer .brand { color: #25292e; font-size: 24px; }
.footer-logo { width: 132px; height: auto; }
.footer .fs { text-align: right; align-self: center; font-size: 14px; }
.footer .fs b { font-weight: 400; }
.footer .meta, .en-foot { font-size: 12px; }
.footer .en-foot { text-align: right; }
.footer .copyright { grid-column: 1 / -1; border-top: 1px solid #dfe1e4; margin-top: 16px; padding-top: 24px; text-align: left; }
.footer .filing { grid-column: 1 / -1; margin: 8px 0 0; text-align: center; font-size: 12px; }
.footer .filing a { color: inherit; text-decoration: none; }
.footer .filing a:hover, .footer .filing a:focus-visible { text-decoration: underline; }
.ph { display: grid; place-content: center; width: 100%; height: 100%; text-align: center; color: #b1b6bf; padding: 24px; }
.ph svg { width: 32px; margin: 0 auto 12px; }
.ph .hint { font-size: 16px; }
.ph .fn { display: none; }
/* Content stays visible without JavaScript. */
.motion-ready .reveal { opacity: 0; transform: translateY(22px); transition: opacity .75s ease, transform .75s ease; }
.motion-ready .reveal.visible { opacity: 1; transform: none; }
/* Keep the desktop title compact and above the film's central subtitles. */
@media (min-width: 961px) {
  .hero { padding-top: calc(var(--nav-height) + 10px); }
  .hero .inner { margin-top: 0; transform: none; }
  .hero .badge { font-size: 12px; margin-bottom: 10px; }
  .hero .hero-logo { width: clamp(210px, 23vw, 320px); margin: 12px auto 12px; }
  .hero .slogan { font-size: clamp(17px, 1.65vw, 21px); margin-top: 16px; }
  .hero .btns { margin-top: 20px; gap: 22px; }
  .hero .btn { min-height: 36px; padding: 6px 20px; font-size: 14px; }
}
@media (max-width: 1180px) {
  .steps { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .brand-school { display: none; }
  .nav ul { gap: 22px; }
  .join-grid { gap: 48px; }
}
@media (max-width: 960px) {
  :root { --pad: 28px; --nav-height: 60px; }
  section { padding: 80px 0; }
  .nav .inner { min-height: var(--nav-height); display: grid; grid-template-columns: 1fr auto 1fr; gap: 12px; }
  .nav .inner > nav { display: contents; }
  .nav .brand { grid-column: 2; grid-row: 1; justify-self: center; }
  .nav .brand-school { display: none; }
  .nav .burger { grid-column: 1; grid-row: 1; justify-self: start; }
  .nav-mobile-join { display: inline-flex; grid-column: 3; grid-row: 1; justify-self: end; align-items: center; min-height: 44px; font-size: 13px; white-space: nowrap; }
  .nav-mobile-join:hover { opacity: .75; }
  .burger { display: block; }
  .nav ul { position: absolute; top: 100%; left: 0; right: 0; display: none; background: #fff; padding: 16px var(--pad) 28px; box-shadow: 0 16px 24px #00000012; max-height: calc(100dvh - 60px); overflow-y: auto; }
  .nav ul.open { display: flex; flex-direction: column; align-items: stretch; gap: 0; }
  .nav ul a { padding: 12px 0; }
  .nav ul a.nav-cta { display: inline-block; margin-top: 12px; }
  .burger[aria-expanded='true'] span:first-child { transform: translateY(6.5px) rotate(45deg); }
  .burger[aria-expanded='true'] span:nth-child(2) { opacity: 0; }
  .burger[aria-expanded='true'] span:last-child { transform: translateY(-6.5px) rotate(-45deg); }
  .about-copy { gap: 24px 36px; }
  .gcard { padding: 28px; }
  .gcard .top { gap: 12px; }
  .gcard .no { display: none; }
  .steps { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 36px; }
  .join-grid { grid-template-columns: 1fr; }
  .qr-cards { max-width: 450px; }
}
@media (max-width: 640px) {
  :root { --pad: 20px; --nav-height: 48px; }
  html { scroll-padding-top: 58px; }
  section { padding: 64px 0; }
  .brand-school { display: none; }
  .brand { gap: 8px; }
  .brand-school { padding-left: 8px; }
  .brand-logo { width: 74px; }
  .brand-school { max-width: 112px; line-height: 1.28; }
  .nav .inner { min-height: 48px; gap: 8px; padding-block: 4px; }
  .burger { width: 34px; height: 34px; padding: 7px; }
  .burger span { height: 1.5px; margin: 4px 0; }
  .burger[aria-expanded='true'] span:first-child { transform: translateY(5.5px) rotate(45deg); }
  .burger[aria-expanded='true'] span:last-child { transform: translateY(-5.5px) rotate(-45deg); }
  .sec-head { margin-bottom: 32px; }
  .sec-head p { margin-top: 16px; }
  .hero { --hero-video-crop-y: clamp(8px, 2.5vw, 14px); --hero-mobile-copy-h: calc(146px + var(--nav-height)); height: calc(var(--hero-mobile-copy-h) + var(--hero-video-full-h) - var(--hero-video-crop-y) * 2); padding: 0 var(--pad); display: block; background: #05070a; }
  .hero::before { top: var(--hero-mobile-copy-h); background: linear-gradient(180deg, #05070a 0, rgba(5,7,10,.65) 18px, rgba(5,7,10,.12) 58px, rgba(5,7,10,.05) 100%); }
  .hero-video-bg { top: var(--hero-mobile-copy-h); height: calc(var(--hero-video-full-h) - var(--hero-video-crop-y)); object-fit: cover; object-position: center top; }
  .hero .inner { max-width: 340px; margin: 0 auto; padding-top: calc(10px + var(--nav-height)); transform: none; }
  .hero-logo { width: min(46vw, 176px); margin: 8px auto 8px; }
  .badge { font-size: 8px; line-height: 1.15; letter-spacing: .16em; margin-bottom: 2px; }
  .slogan { font-size: 15px; line-height: 1.25; margin-top: 8px; font-weight: 600; }
  .hero .btns { gap: 16px; margin-top: 14px; }
  .hero-video-open { position: absolute; right: 12px; bottom: 12px; z-index: 3; display: inline-flex; min-height: 20px; padding: 1px 6px; border: 1px solid #ffffff33; border-radius: 999px; background: rgba(5,7,10,.38); color: #fff; font-size: 9px; line-height: 1.15; gap: 3px; backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
  .hero .btn:not(.hero-video-open) { min-height: 27px; padding: 2px 10px; font-size: 11px; gap: 6px; }
  .hero-caption { display: none; }
  .hero-caption a span { margin-left: 8px; }
  .stats { padding: 28px var(--pad); }
  .stats .grid { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 32px 0; }
  .stat { padding: 8px 10px; }
  .stat:nth-child(2) { border: 0; }
  .stat .num { font-size: 44px; }
  .stat p { font-size: 12px; margin-top: 10px; }
  #robots { padding-top: 56px; padding-bottom: 10px; }
  #robots .wrap { width: calc(100% - 20px); }
  .robot-grid { grid-template-columns: 1fr; gap: 10px; }
  .rcard .body { padding-top: 32px; }
  .rcard .pic { position: relative; isolation: isolate; height: 340px; padding: 16px 28px; margin: 12px 0 22px; }
  .about-copy { grid-template-columns: 1fr; gap: 22px; padding-bottom: 36px; }
  .about-copy .sec-head { grid-row: auto; margin-bottom: 4px; }
  .about-media { margin-inline: calc(-1 * var(--pad)); }
  .group-grid { grid-template-columns: 1fr; gap: 12px; }
  .gcard { padding: 28px 24px; }
  .gcard .role { font-size: 12px; }
  .steps { grid-template-columns: 1fr; gap: 28px; }
  .step .no { font-size: 36px; }
  .step h4 { font-size: 19px; margin-top: 14px; }
  .step p { font-size: 14px; }
  .faq summary { font-size: 16px; padding-block: 22px; }
  .faq summary::after { top: 24px; }
  .faq .ans { padding-right: 20px; }
  .join-grid { gap: 40px; }
  .join .btns { gap: 10px; }
  .join .btn { padding-inline: 18px; }
  .qr-cards { gap: 16px; }
  .follow-grid { grid-template-columns: 1fr; }
  .fcard { border-right: 0; border-bottom: 1px solid var(--line); padding: 28px 0; }
  .fqr { margin-top: 8px; }
  .footer .wrap { grid-template-columns: 1fr; gap: 10px; }
  .footer .fs, .footer .en-foot { text-align: left; }
  .qr-viewer { padding: 14px; align-items: center; }
  .qr-viewer-panel { width: min(100%, 430px); max-height: calc(100dvh - 28px); }
  .qr-viewer-head { min-height: 50px; padding-left: 16px; }
  .qr-viewer-stage { padding: 14px; }
  .qr-viewer-stage img { max-height: calc(100dvh - 106px); }
  .video-viewer { padding: 10px; }
  .video-viewer-panel { width: 100%; max-height: calc(100dvh - 20px); }
  .video-viewer-head { min-height: 46px; padding-left: 14px; }
  .video-viewer video { max-height: calc(100dvh - 66px); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .motion-ready .reveal { opacity: 1; transform: none; }
}