:root {
  --ink: #071d33;
  --ink-soft: #173a52;
  --blue: #0b4f85;
  --cyan: #79d2d5;
  --paper: #f4f7f6;
  --white: #ffffff;
  --mist: #dbe4e6;
  --warm: #d2aa68;
  --text: #1c2a33;
  --muted: #63717a;
  --line: rgba(7, 29, 51, 0.16);
  --page: min(1240px, calc(100vw - 80px));
  --header-height: 78px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }
body { margin: 0; color: var(--text); background: var(--paper); font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif; line-height: 1.7; }
body.modal-open { overflow: hidden; }
body.menu-open { overflow: hidden; }
img { display: block; max-width: 100%; }
button, a { font: inherit; }
a { color: inherit; }
button { color: inherit; }
section { position: relative; }

.skip-link { position: fixed; left: 16px; top: 8px; z-index: 1000; padding: 10px 14px; color: var(--white); background: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 4px; }

.site-header { position: fixed; inset: 0 0 auto; z-index: 100; min-height: var(--header-height); display: flex; align-items: center; justify-content: space-between; padding: 12px 40px; color: var(--white); border-bottom: 1px solid rgba(255,255,255,.2); transition: background-color .3s, color .3s, box-shadow .3s; }
.site-header.is-scrolled { color: var(--ink); background: rgba(244,247,246,.96); box-shadow: 0 10px 30px rgba(7,29,51,.08); }
.brand { position: relative; z-index: 2; display: inline-flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-mark { position: relative; width: 36px; height: 38px; display: inline-block; }
.brand-mark i { position: absolute; inset: 2px auto 2px 6px; width: 11px; border: 3px solid currentColor; border-top-color: transparent; border-bottom-color: transparent; border-radius: 50%; transform: rotate(8deg); }
.brand-mark i:last-child { left: 17px; transform: rotate(-8deg); }
.brand-word { display: grid; line-height: 1; }
.brand-word strong { font-size: 20px; letter-spacing: 0; }
.brand-word small { margin-top: 6px; font-size: 8px; letter-spacing: 2px; }
.site-nav ul { display: flex; align-items: center; gap: 28px; margin: 0; padding: 0; list-style: none; }
.site-nav a { font-size: 14px; text-decoration: none; }
.site-nav a:not(.nav-cta) { position: relative; }
.site-nav a:not(.nav-cta)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: -7px; height: 1px; background: currentColor; transition: right .25s; }
.site-nav a:hover::after { right: 0; }
.nav-cta { display: inline-flex; min-height: 42px; align-items: center; padding: 0 18px; border: 1px solid currentColor; }
.menu-toggle { display: none; width: 44px; height: 44px; padding: 0; border: 0; background: transparent; }
.menu-toggle span { display: block; width: 24px; height: 1px; margin: 7px auto; background: currentColor; transition: transform .25s; }

.hero { min-height: 88svh; display: grid; align-items: end; overflow: hidden; color: var(--white); background: var(--ink); }
.hero-media, .hero-shade { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-media { object-fit: cover; object-position: center 42%; }
.hero-shade { background: rgba(3, 17, 30, .54); }
.hero::after { content: ""; position: absolute; inset: 0; border: 20px solid rgba(255,255,255,.04); pointer-events: none; }
.hero-content { position: relative; z-index: 2; width: var(--page); margin: auto; padding: 170px 0 170px; }
.eyebrow, .section-kicker { margin: 0 0 18px; font-size: 11px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; }
.hero h1 { max-width: 800px; margin: 0; font-family: "Songti SC", STSong, serif; font-size: clamp(72px, 10vw, 142px); font-weight: 500; line-height: .95; letter-spacing: 0; }
.hero-lead { max-width: 660px; margin: 30px 0 0; font-size: clamp(20px, 2.4vw, 34px); line-height: 1.45; }
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 44px; }
.button { display: inline-flex; min-height: 50px; align-items: center; justify-content: center; gap: 28px; padding: 0 22px; border: 1px solid transparent; border-radius: 2px; text-decoration: none; cursor: pointer; transition: transform .2s, background-color .2s, color .2s; }
.button:hover { transform: translateY(-2px); }
.button-light { color: var(--ink); background: var(--white); }
.button-dark { color: var(--white); background: var(--ink); }
.text-button { display: inline-flex; min-height: 48px; align-items: center; gap: 12px; padding: 0; color: inherit; border: 0; background: transparent; cursor: pointer; }
.play-icon { width: 42px; height: 42px; border: 1px solid currentColor; border-radius: 50%; position: relative; }
.play-icon::after { content: ""; position: absolute; left: 17px; top: 13px; border-left: 10px solid currentColor; border-top: 7px solid transparent; border-bottom: 7px solid transparent; }
.hero-proof { position: absolute; z-index: 2; right: 40px; bottom: 32px; display: flex; gap: 36px; }
.hero-proof p { display: grid; margin: 0; padding-left: 16px; border-left: 1px solid rgba(255,255,255,.46); }
.hero-proof strong { font-size: 13px; }
.hero-proof span { margin-top: 4px; color: rgba(255,255,255,.7); font-size: 11px; }

.intro-band { display: flex; min-height: 92px; align-items: center; justify-content: center; gap: 30px; padding: 22px 40px; color: var(--ink); background: var(--white); }
.intro-band p { margin: 0; font-size: 14px; }
.intro-band span { width: 38px; height: 1px; background: var(--cyan); }
.section { padding: 130px 0; }
.section-inner { width: var(--page); margin: 0 auto; }
.section-kicker { color: var(--blue); }
.section h2, .film-band h2, .contact h2 { margin: 0; color: var(--ink); font-family: "Songti SC", STSong, serif; font-size: clamp(40px, 5.2vw, 72px); font-weight: 500; line-height: 1.15; letter-spacing: 0; }
.section-lead { font-size: 22px; line-height: 1.7; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 60px; margin-bottom: 62px; }
.section-heading > p { max-width: 430px; margin: 0 0 8px; color: var(--muted); }

.section-about { background: var(--paper); }
.about-layout { display: grid; grid-template-columns: minmax(0, .88fr) minmax(520px, 1.12fr); align-items: center; gap: 8vw; }
.about-copy > p:not(.section-kicker) { max-width: 650px; }
.about-values { margin-top: 42px; border-top: 1px solid var(--line); }
.about-values p { display: grid; grid-template-columns: 50px 1fr; align-items: start; gap: 10px; margin: 0; padding: 18px 0; border-bottom: 1px solid var(--line); }
.about-values b { color: var(--blue); font-size: 12px; }
.about-values span { color: var(--muted); }
.about-values strong { display: block; color: var(--text); }
.about-visual { margin: 0; }
.about-visual img { width: 100%; aspect-ratio: 4 / 4.5; object-fit: cover; }
.about-visual figcaption { display: flex; justify-content: space-between; gap: 24px; margin-top: 12px; color: var(--muted); font-size: 12px; }
.about-visual figcaption span { color: var(--blue); font-weight: 700; letter-spacing: 2px; }

.technology { padding-bottom: 110px; color: var(--white); background: var(--ink); }
.technology .section-kicker { color: var(--cyan); }
.technology h2 { color: var(--white); }
.tech-intro { display: grid; grid-template-columns: 1.05fr .75fr; align-items: end; gap: 9vw; margin-bottom: 70px; }
.tech-summary { margin: 0; color: rgba(255,255,255,.72); font-size: 17px; }
.tech-stage { position: relative; min-height: 760px; display: grid; align-items: end; overflow: hidden; }
.tech-stage::after { content: ""; position: absolute; inset: 0; background: rgba(3,17,30,.36); }
.tech-stage > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.tech-metrics { position: relative; z-index: 2; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-bottom: 34px; background: rgba(255,255,255,.24); }
.metric { min-height: 240px; padding: 30px; background: rgba(5,27,47,.88); }
.metric > span { display: block; color: var(--cyan); font-size: 12px; }
.metric strong { display: block; margin-top: 28px; font-size: clamp(40px, 4.5vw, 66px); line-height: 1; }
.metric small { font-size: 16px; font-weight: 400; }
.metric p { max-width: 310px; margin-top: 24px; color: rgba(255,255,255,.65); font-size: 13px; }
.tech-details { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: 70px; }
.tech-detail { min-height: 240px; padding: 0 30px 0 0; border-right: 1px solid rgba(255,255,255,.14); }
.tech-detail + .tech-detail { padding-left: 30px; }
.tech-detail:last-child { border-right: 0; }
.detail-index { color: var(--cyan); font-size: 12px; }
.tech-detail h3 { margin: 50px 0 12px; font-size: 20px; }
.tech-detail p { margin: 0; color: rgba(255,255,255,.6); font-size: 14px; }
.tech-source-note { margin-top: 34px; color: rgba(255,255,255,.48); font-size: 11px; }

.journey { background: var(--white); }
.journey-tabs { display: grid; grid-template-columns: repeat(3, 1fr); margin-bottom: 40px; border-bottom: 1px solid var(--line); }
.journey-tabs button { min-height: 60px; padding: 0 14px; color: var(--muted); border: 0; border-bottom: 3px solid transparent; background: transparent; cursor: pointer; }
.journey-tabs button[aria-selected="true"] { color: var(--blue); border-bottom-color: var(--blue); }
.journey-panel { min-height: 520px; display: grid; grid-template-columns: 100px minmax(320px, .8fr) minmax(430px, 1.2fr); align-items: center; gap: 5vw; }
.journey-panel[hidden] { display: none; }
.panel-number { align-self: start; padding-top: 12px; color: var(--cyan); font-size: 46px; font-weight: 300; }
.journey-panel h3 { margin: 0 0 18px; color: var(--ink); font-size: 34px; }
.journey-panel p { color: var(--muted); }
.journey-panel ul { margin: 28px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.journey-panel li { padding: 12px 0; border-bottom: 1px solid var(--line); }
.journey-panel img { width: 100%; height: 520px; object-fit: cover; object-position: center; }
.journey-panel:first-of-type img { object-position: center 28%; }

.doctors { background: var(--paper); }
.doctor-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.doctor { background: var(--white); border: 1px solid var(--line); border-radius: 4px; overflow: hidden; }
.doctor-photo { aspect-ratio: 3 / 3.6; overflow: hidden; background: var(--mist); }
.doctor-photo img { width: 100%; height: 100%; object-fit: cover; object-position: center 20%; transition: transform .6s; }
.doctor:hover .doctor-photo img { transform: scale(1.025); }
.doctor-info { padding: 25px 26px 22px; }
.doctor-info > p { margin: 0; color: var(--blue); font-size: 12px; }
.doctor-info h3 { margin: 3px 0 8px; color: var(--ink); font-family: "Songti SC", STSong, serif; font-size: 34px; font-weight: 500; }
.doctor-info > span { color: var(--muted); font-size: 13px; }
.doctor details { margin-top: 22px; padding-top: 14px; border-top: 1px solid var(--line); }
.doctor summary { cursor: pointer; font-size: 13px; font-weight: 700; }
.doctor details p { margin-bottom: 0; color: var(--muted); font-size: 13px; }
.doctor-advisor { display: grid; grid-template-columns: .72fr 1.28fr; align-items: center; gap: 7vw; margin-top: 28px; padding: 28px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.doctor-advisor p { margin: 0; color: var(--muted); }
.doctor-advisor div > p { color: var(--blue); font-size: 12px; }
.doctor-advisor h3 { margin: 4px 0 0; color: var(--ink); font-family: "Songti SC", STSong, serif; font-size: 32px; font-weight: 500; }
.source-note { margin: 24px 0 0; color: var(--muted); font-size: 12px; }

.space { background: var(--white); }
.space-gallery { display: grid; grid-template-columns: 1.45fr .75fr; grid-template-rows: repeat(2, 310px); gap: 14px; }
.space-gallery figure { margin: 0; overflow: hidden; }
.space-gallery .space-main { grid-row: 1 / 3; }
.space-gallery img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s; }
.space-gallery figure:hover img { transform: scale(1.02); }

.film-band { min-height: 80svh; display: grid; align-items: center; overflow: hidden; color: var(--white); background: var(--ink); }
.film-band > img, .film-shade { position: absolute; inset: 0; width: 100%; height: 100%; }
.film-band > img { object-fit: cover; }
.film-shade { background: rgba(3,17,30,.68); }
.film-content { position: relative; z-index: 2; width: var(--page); margin: auto; }
.film-band .section-kicker { color: var(--cyan); }
.film-band h2 { max-width: 820px; color: var(--white); }
.film-band .button { margin-top: 38px; }

.company { background: #e9eeee; }
.company-layout { display: grid; grid-template-columns: .8fr 1.2fr; align-items: start; gap: 9vw; }
.company-facts { display: grid; grid-template-columns: repeat(2, 1fr); }
.company-facts p { min-height: 160px; display: grid; align-content: center; margin: 0; padding: 24px; border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.company-facts strong { color: var(--blue); font-size: 30px; }
.company-facts span { margin-top: 8px; color: var(--muted); font-size: 13px; }

.contact { padding: 120px 0; color: var(--white); background: var(--cyan); }
.contact .section-kicker { color: var(--ink-soft); }
.contact-layout { display: grid; grid-template-columns: .85fr 1.15fr; align-items: center; gap: 7vw; }
.contact-copy > p:not(.section-kicker) { max-width: 640px; color: var(--ink-soft); font-size: 17px; }
.contact-phone { display: grid; width: max-content; margin-top: 28px; padding-top: 18px; color: var(--ink); border-top: 1px solid rgba(7,29,51,.3); }
.contact-phone p { margin: 0; font-size: 12px; font-weight: 700; letter-spacing: 2px; }
.contact-phone a { margin-top: 5px; color: var(--ink); font-size: clamp(30px, 3.3vw, 46px); font-weight: 600; line-height: 1.2; text-decoration: none; }
.contact-phone span { margin-top: 5px; color: var(--ink-soft); font-size: 12px; }
.contact-copy .button { margin-top: 28px; }
.contact-details { display: grid; grid-template-columns: minmax(240px, 1fr) minmax(210px, 260px); align-items: center; gap: 36px; padding-left: 48px; border-left: 1px solid rgba(7,29,51,.3); }
.contact-address { min-height: 310px; display: flex; flex-direction: column; justify-content: center; color: var(--ink); font-style: normal; }
.contact-address p { margin: 0 0 18px; font-size: 12px; font-weight: 700; letter-spacing: 2px; }
.contact-address strong { font-size: clamp(22px, 2.4vw, 34px); line-height: 1.45; }
.copy-button { width: max-content; margin-top: 26px; padding: 0 0 5px; border: 0; border-bottom: 1px solid currentColor; background: transparent; cursor: pointer; }
.copy-status { min-height: 24px; margin-top: 8px; font-size: 12px; }
.contact-qr { margin: 0; color: var(--ink); text-align: center; }
.contact-qr img { width: min(260px, 100%); height: auto; margin: 0 auto; border: 1px solid rgba(7,29,51,.14); background: var(--white); }
.contact-qr figcaption { display: grid; margin-top: 12px; line-height: 1.5; }
.contact-qr figcaption strong { font-size: 15px; }
.contact-qr figcaption span { color: var(--ink-soft); font-size: 12px; }

.site-footer { display: grid; grid-template-columns: .8fr .8fr 2fr auto; align-items: start; gap: 40px; padding: 50px 40px; color: rgba(255,255,255,.68); background: var(--ink); font-size: 12px; }
.site-footer p { margin: 0; }
.footer-brand { display: grid; color: var(--white); line-height: 1.2; }
.footer-brand strong { font-size: 20px; }
.footer-brand span { margin-top: 6px; font-size: 8px; letter-spacing: 2px; }
.footer-note { max-width: 620px; }

.video-modal[hidden] { display: none; }
.video-modal { position: fixed; inset: 0; z-index: 300; display: grid; place-items: center; padding: 24px; }
.video-backdrop { position: absolute; inset: 0; background: rgba(1,10,18,.88); }
.video-shell { position: relative; z-index: 1; width: min(1100px, 92vw); color: var(--white); background: #02070b; box-shadow: 0 30px 100px rgba(0,0,0,.45); }
.video-bar { min-height: 58px; display: flex; align-items: center; justify-content: space-between; padding: 8px 12px 8px 20px; }
.video-bar h2 { margin: 0; font-size: 15px; font-weight: 500; }
.modal-close { width: 44px; height: 44px; padding: 0; color: var(--white); border: 0; background: transparent; font-size: 32px; cursor: pointer; }
.video-shell video { display: block; width: 100%; max-height: 72vh; background: #000; }
.video-error { margin: 0; padding: 12px 20px 0; color: #ffd1c6; font-size: 12px; }
.video-transcript { padding: 12px 20px 18px; color: rgba(255,255,255,.68); font-size: 12px; }
.video-transcript summary { width: max-content; cursor: pointer; color: var(--white); }
.video-transcript p { max-width: 860px; margin: 10px 0 0; }

.reveal { opacity: 1; transform: none; }
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s, transform .7s; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1040px) {
  :root { --page: min(100% - 48px, 920px); }
  .hero-proof { display: none; }
  .about-layout, .tech-intro, .company-layout { grid-template-columns: 1fr; }
  .about-visual img { aspect-ratio: 16 / 10; }
  .tech-details { grid-template-columns: repeat(2, 1fr); gap: 44px 0; }
  .tech-detail:nth-child(2) { border-right: 0; }
  .journey-panel { grid-template-columns: 70px 1fr; }
  .journey-panel img { grid-column: 1 / 3; height: 420px; }
  .contact-layout { grid-template-columns: 1fr; gap: 60px; }
  .contact-details { padding: 42px 0 0; border-top: 1px solid rgba(7,29,51,.3); border-left: 0; }
  .site-footer { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  :root { --page: calc(100vw - 36px); --header-height: 66px; }
  .site-header { min-height: var(--header-height); padding: 10px 18px; }
  .brand-mark { width: 29px; height: 32px; }
  .brand-mark i { left: 4px; width: 9px; border-width: 2px; }
  .brand-mark i:last-child { left: 14px; }
  .brand-word strong { font-size: 17px; }
  .menu-toggle { display: block; position: relative; z-index: 2; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }
  .site-nav ul { position: fixed; inset: 0; display: grid; align-content: center; gap: 4px; padding: 90px 24px 40px; color: var(--white); background: var(--ink); opacity: 0; visibility: hidden; transform: translateY(-14px); transition: opacity .25s, transform .25s, visibility .25s; }
  .site-nav ul.is-open { opacity: 1; visibility: visible; transform: translateY(0); }
  body.menu-open .site-header { color: var(--white); background: transparent; border-bottom-color: rgba(255,255,255,.16); box-shadow: none; }
  .site-nav li { border-bottom: 1px solid rgba(255,255,255,.14); }
  .site-nav a { display: flex; min-height: 62px; align-items: center; font-size: 20px; }
  .nav-cta { padding: 0; border: 0; }
  .hero { min-height: 86svh; }
  .hero::after { border-width: 8px; }
  .hero-media { object-position: 61% center; }
  .hero-content { padding: 130px 0 70px; }
  .hero h1 { font-size: clamp(58px, 21vw, 88px); }
  .hero-lead { max-width: 330px; margin-top: 24px; font-size: 20px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 12px; margin-top: 34px; }
  .intro-band { align-items: flex-start; flex-direction: column; gap: 7px; padding: 22px 18px; }
  .intro-band span { width: 1px; height: 16px; margin-left: 6px; }
  .section { padding: 84px 0; }
  .section h2, .film-band h2, .contact h2 { font-size: 42px; }
  .section-lead { font-size: 18px; }
  .section-heading { align-items: start; flex-direction: column; gap: 22px; margin-bottom: 42px; }
  .about-layout { display: flex; flex-direction: column; gap: 54px; }
  .about-visual { order: -1; }
  .about-visual img { aspect-ratio: 4 / 3; }
  .technology { padding-bottom: 80px; }
  .tech-intro { gap: 30px; margin-bottom: 48px; }
  .tech-stage { min-height: 840px; }
  .tech-stage > img { object-position: 28% center; }
  .tech-metrics { grid-template-columns: 1fr; width: calc(100% - 36px); margin-bottom: 18px; }
  .metric { min-height: auto; padding: 22px; }
  .metric strong { margin-top: 16px; }
  .metric p { margin: 14px 0 0; }
  .tech-details { grid-template-columns: 1fr; gap: 0; margin-top: 50px; }
  .tech-detail, .tech-detail + .tech-detail { min-height: auto; padding: 26px 0; border-right: 0; border-bottom: 1px solid rgba(255,255,255,.14); }
  .tech-detail h3 { margin: 16px 0 8px; }
  .journey-tabs { gap: 8px; border: 0; }
  .journey-tabs button { min-height: 48px; padding: 0 6px; border: 1px solid var(--line); border-radius: 2px; font-size: 13px; }
  .journey-tabs button[aria-selected="true"] { color: var(--white); border-color: var(--blue); background: var(--blue); }
  .journey-panel { min-height: 0; grid-template-columns: 1fr; gap: 22px; }
  .panel-number { padding: 0; font-size: 34px; }
  .journey-panel img { grid-column: 1; height: 330px; }
  .doctor-grid { grid-template-columns: 1fr; }
  .doctor-photo { aspect-ratio: 3 / 3.1; }
  .doctor-advisor { grid-template-columns: 1fr; gap: 18px; }
  .space-gallery { display: grid; grid-template-columns: 1fr; grid-template-rows: 380px 240px 240px; }
  .space-gallery .space-main { grid-row: auto; }
  .film-band { min-height: 72svh; }
  .film-band > img { object-position: 62% center; }
  .company-layout { gap: 46px; }
  .company-facts { grid-template-columns: 1fr; }
  .company-facts p { min-height: 120px; border-left: 0; }
  .contact { padding: 84px 0; }
  .contact-details { grid-template-columns: 1fr; gap: 34px; padding-top: 34px; }
  .contact-address { min-height: 0; }
  .contact-qr { text-align: left; }
  .contact-qr img { margin: 0; }
  .site-footer { grid-template-columns: 1fr; gap: 22px; padding: 44px 18px; }
  .video-modal { padding: 12px; }
  .video-shell { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}