:root {
  color-scheme: light;
  --navy: #08121e;
  --deep: #050d16;
  --ink: #142333;
  --muted: #526577;
  --gold: #e6c17a;
  --warm: #f7f6f2;
  --rule: #d8dfe2;
  --wrap: min(1250px, calc(100% - 112px));
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 106px; }
body { margin: 0; background: var(--warm); color: var(--ink); }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; }
img { display: block; width: 100%; height: auto; }
figure, p, h1, h2, h3 { margin: 0; }
button:focus-visible, a:focus-visible, summary:focus-visible, [role="tabpanel"]:focus-visible { outline: 2px solid #328fc4; outline-offset: 4px; }
[hidden] { display: none !important; }
.wrap { width: var(--wrap); margin-inline: auto; }
.skip { position: fixed; z-index: 20; top: 6px; left: 12px; padding: 12px; background: white; transform: translateY(-125%); }
.skip:focus { transform: none; }

.header { position: sticky; top: 0; z-index: 10; color: #eaf0f5; background: #08121ef5; border-bottom: 1px solid #a3c3df26; }
.header-inner { min-height: 79px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: block; width: 146px; flex: 0 0 auto; }
.navigation, .header-tools, .languages { display: flex; align-items: center; }
.navigation { gap: clamp(15px, 2vw, 31px); }
.navigation a { font-size: 14px; font-weight: 600; white-space: nowrap; }
.navigation a:hover, .navigation a:focus-visible, .languages a:hover { color: var(--gold); }
.header-tools { gap: 20px; }
.languages { gap: 9px; font-size: 11px; font-weight: 700; color: #b5c6d7; white-space: nowrap; }
.languages svg { margin-right: 1px; }
.languages a { padding-block: 8px; }
.languages [aria-current] { color: var(--gold); border-bottom: 1px solid currentColor; }
.header-contact { display: flex; gap: 13px; align-items: center; padding: 10px 13px; border: 1px solid #cfa76880; color: #f0cf91; font-size: 12px; white-space: nowrap; }
.header-contact:hover { background: #e6c17a23; }
.menu { display: none; width: 40px; height: 40px; background: transparent; border: 1px solid #bbc7d342; }
.menu span { display: block; width: 17px; height: 1px; margin: 5px auto; background: #e6effa; }

.hero { position: relative; isolation: isolate; color: white; background: #071321; }
.hero-art { position: absolute; inset: 0; z-index: -2; background: url("/assets/film-background.webp") 74% 51% / cover no-repeat; }
.hero-art::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, #050e19 0%, #06111ef5 23%, #071321ac 48%, #0713212b 80%), linear-gradient(0deg, #08131e 0%, transparent 37%, #070f1c42 100%); }
.hero-grid { position: relative; min-height: clamp(545px, 71svh, 740px); display: grid; align-items: center; padding-block: 70px 88px; }
.hero-main { max-width: min(750px, 72%); position: relative; }
.eyebrow { display: flex; gap: 12px; align-items: center; color: #86622d; font-size: 11px; font-weight: 750; letter-spacing: .15em; line-height: 1.5; }
.eyebrow::before { content: ""; flex: 0 0 23px; height: 1px; background: currentColor; }
.hero .eyebrow, .media .eyebrow, .contact .eyebrow { color: var(--gold); }
.hero h1 { margin: 21px 0 21px; font-size: clamp(48px, 6.1vw, 94px); letter-spacing: -.05em; line-height: 1.09; font-weight: 730; text-wrap: balance; }
.hero h1 em { font-style: normal; color: #f1d394; }
:lang(zh-CN) .hero h1 { letter-spacing: .012em; line-height: 1.14; }
html:not([lang="zh-CN"]) .hero h1 { font-size: clamp(45px, 5.2vw, 79px); }
.hero-copy { max-width: 510px; color: #d6e3f0; font-size: clamp(15px, 1.35vw, 18px); line-height: 1.75; }
.hero-actions { display: flex; align-items: stretch; gap: 13px; flex-wrap: wrap; margin-top: 33px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 13px; padding: 12px 19px; min-height: 48px; border: 1px solid transparent; font-size: 13px; font-weight: 700; transition: background-color .2s, border-color .2s; }
.primary { background: #edcb86; color: #16202a; }
.primary:hover { background: #ffe2a6; }
.ghost { background: #08152399; color: #f0f5fa; border-color: #bbd0df71; }
.ghost:hover { border-color: var(--gold); background: #102a3c; }
.ghost svg { color: var(--gold); flex: none; }
.scene { position: absolute; bottom: 22px; right: 0; display: flex; gap: 8px; align-items: center; color: #e6edf5; background: #071321b8; padding: 6px 9px; font-size: 10px; }
.scene span { width: 5px; height: 5px; background: var(--gold); border-radius: 50%; box-shadow: 0 0 8px var(--gold); }
.hero-facts { border-top: 1px solid #a5c1da3b; background: #0b1927e6; }
.pillars { list-style: none; padding: 0; margin-block: 0; display: grid; grid-template-columns: repeat(3, 1fr); }
.pillars li { display: flex; align-items: center; min-height: 88px; padding: 13px clamp(14px, 3vw, 45px); gap: 15px; border-left: 1px solid #a5c1da2e; }
.pillars li:first-child { padding-left: 0; border-left: 0; }
.pillars li > span { color: var(--gold); font: 12px ui-monospace, monospace; }
.pillars strong, .pillars small { display: block; }
.pillars strong { color: #f4f7fb; font-size: 15px; }
.pillars small { margin-top: 5px; color: #a5bdd2; letter-spacing: .09em; font-size: 9px; line-height: 1.45; }

.section { padding-block: clamp(65px, 8vw, 116px); }
.section-head h2 { margin-top: 12px; font-size: clamp(32px, 4.25vw, 60px); line-height: 1.15; letter-spacing: -.045em; font-weight: 730; text-wrap: balance; }
:lang(zh-CN) .section-head h2 { letter-spacing: .005em; }
.section-copy { max-width: 680px; margin-top: 18px; color: var(--muted); font-size: 16px; line-height: 1.8; }
.section-head { margin-bottom: 32px; }
.step-tabs, .catalogue-tabs { display: grid; border: 1px solid var(--rule); }
.step-tabs { grid-template-columns: repeat(5, minmax(0, 1fr)); }
[role="tab"] { border: 0; min-height: 64px; background: #fafaf7; font-weight: 650; font-size: 13px; position: relative; text-align: left; padding: 12px 14px; }
[role="tab"] + [role="tab"] { border-left: 1px solid var(--rule); }
[role="tab"] span { display: block; color: #84602b; font: 11px ui-monospace, monospace; margin-bottom: 6px; }
[role="tab"]:hover { background: #eaf0f3; }
[role="tab"][aria-selected="true"] { background: #13293a; color: white; box-shadow: inset 0 -3px var(--gold); }
[role="tab"][aria-selected="true"] span { color: var(--gold); }
.step-panel { display: grid; grid-template-columns: 1.32fr 1fr; min-height: 340px; background: #0b1a28; color: #fff; }
.step-panel figure, .engineering-image, .campus { position: relative; margin: 0; overflow: hidden; }
.step-panel img, .engineering-image img, .campus img { width: 100%; height: 100%; object-fit: cover; }
.step-panel figure { min-height: 340px; }
.step-panel figcaption, .engineering-image figcaption, .campus figcaption { position: absolute; inset: auto auto 12px 12px; color: #f2f7fc; padding: 6px 10px; background: #08121ee8; font-size: 11px; }
.step-copy { padding: clamp(29px, 5vw, 68px); align-self: center; }
.step-copy .eyebrow { color: var(--gold); }
.step-copy h3 { margin: 16px 0 13px; font-size: clamp(23px, 2.45vw, 35px); line-height: 1.25; }
.step-copy p { line-height: 1.75; color: #c8d7e4; }
.section-links { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-block: 19px 42px; }
.section-links p, .fine { color: var(--muted); font-size: 13px; line-height: 1.6; }
.text-link { display: inline-flex; gap: 9px; align-items: center; font-size: 13px; font-weight: 700; width: fit-content; }
.text-link:hover { text-decoration: underline; text-underline-offset: 4px; }
.seams { display: grid; grid-template-columns: repeat(3, 1fr); border-block: 1px solid var(--rule); }
.seams article { padding: 20px clamp(14px, 2.9vw, 36px); }
.seams article:first-child { padding-left: 0; }
.seams article + article { border-left: 1px solid var(--rule); }
.row-no { color: #84602b; font: 12px ui-monospace, monospace; }
.seams h3 { margin: 9px 0 7px; font-size: 17px; }
.seams p { font-size: 14px; color: var(--muted); line-height: 1.65; }

.engineering { background: #e9eef0; }
.engineering-grid { display: grid; grid-template-columns: .87fr 1fr; gap: clamp(19px, 4vw, 50px); }
.engineering-image { min-height: 360px; }
.engineering-image img { position: absolute; }
.catalogue-tabs { grid-template-columns: 1fr 1fr; }
.catalogue-tabs button { min-height: 50px; }
.engineering details { border-bottom: 1px solid #cad5db; }
.engineering summary { display: grid; grid-template-columns: 24px 1fr 18px; align-items: baseline; gap: 11px; padding-block: 16px; cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
.engineering details p { padding: 0 26px 16px 35px; color: var(--muted); line-height: 1.6; font-size: 14px; }
.plus::before { content: "+"; }
details[open] .plus::before { content: "−"; }
.engineering .fine { padding-top: 10px; }
.partner { display: grid; grid-template-columns: .87fr 1fr; gap: clamp(19px, 4vw, 50px); margin-top: 28px; padding: 24px 26px; background: #f7f8f5; border-left: 3px solid #b78440; }
.partner .eyebrow { align-self: start; margin-top: 4px; }
.partner h3 { font-size: 20px; margin-bottom: 7px; }
.partner p:not(.eyebrow) { font-size: 14px; color: var(--muted); }

.about { background: #faf9f6; }
.about-grid { display: grid; grid-template-columns: .93fr 1.07fr; align-items: center; gap: clamp(30px, 6vw, 80px); }
.about-grid .section-head { margin-bottom: 18px; }
.legal-name { font-size: 13px; font-weight: 700; color: #466071; }
.campus { min-height: 235px; height: 100%; max-height: 300px; }
.expert { display: grid; grid-template-columns: minmax(145px, 230px) 1fr; align-items: center; gap: clamp(24px, 4vw, 55px); background: #eff0eb; margin-top: 35px; padding: clamp(22px, 3.2vw, 45px); }
.expert-photo { aspect-ratio: 1 / 1.03; object-fit: cover; object-position: center 24%; }
.expert h3 { font-size: clamp(24px, 3.1vw, 40px); margin: 10px 0; }
.expert p:not(.eyebrow), .expert details { max-width: 760px; color: var(--muted); line-height: 1.65; }
.expert summary { list-style: none; color: var(--ink); font-weight: 650; margin-top: 15px; cursor: pointer; }
.expert details p { padding-top: 8px; }
.principles { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--rule); color: #795728; font-size: 16px; font-weight: 680; }

.media { background: #0b1725; color: white; }
.media-grid { display: grid; grid-template-columns: 1.45fr 1fr; gap: 24px; }
.film-card { display: grid; align-content: end; min-height: 365px; isolation: isolate; position: relative; padding: 25px; overflow: hidden; background: #203448; }
.film-card img, .film-card::after { position: absolute; inset: 0; width: 100%; height: 100%; z-index: -2; object-fit: cover; }
.film-card::after { content: ""; z-index: -1; background: linear-gradient(0deg, #07111df7 1%, #07111d32 52%, #07111d44 100%); }
.film-runtime { position: absolute; right: 15px; top: 15px; color: #f3dcac; background: #08121ecb; padding: 6px 9px; font: 12px ui-monospace, monospace; }
.film-play { display: grid; place-items: center; width: 64px; height: 64px; position: absolute; left: 50%; top: 49%; translate: -50% -50%; border: 1px solid #efd5a2; background: #06111ba3; color: #ffe4a8; border-radius: 50%; }
.film-play svg { width: 24px; height: 24px; margin-left: 3px; }
.film-card:hover .film-play { background: #e6c17a; color: var(--deep); }
.media small { display: block; font-size: 11px; color: #e1c18a; }
.film-card h3 { margin-top: 6px; font-size: clamp(20px, 2.4vw, 32px); }
.media-list { display: grid; grid-template-rows: repeat(3, 1fr); gap: 12px; }
.media-list a { display: grid; grid-template-columns: 100px 1fr 15px; gap: 15px; align-items: center; padding: 14px; border: 1px solid #a6c8e23d; background: #152638; }
.media-list a:hover { border-color: var(--gold); }
.media-list img, .pdf-icon { width: 100%; aspect-ratio: 1.64; object-fit: cover; }
.pdf-icon { display: grid; place-items: center; border: 1px solid #c5a1687d; color: var(--gold); font: 14px ui-monospace, monospace; }
.media-list strong { display: block; margin-top: 6px; font-size: 15px; line-height: 1.3; }
.media .fine { margin-top: 17px; color: #b6c8d9; }

.contact { color: #f2f6fa; background: #122538; border-top: 1px solid #a6c8e236; }
.contact-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: clamp(35px, 6vw, 85px); align-items: center; }
.contact .section-copy { color: #c9d8e6; }
address { font-style: normal; color: #dae5ed; max-width: 440px; font-size: 14px; line-height: 1.7; }
address span { display: block; margin-bottom: 5px; color: var(--gold); font-size: 12px; font-weight: 650; }
.person { display: grid; grid-template-columns: 1fr max-content; gap: 10px 14px; align-items: center; padding: 16px 0; border-block: 1px solid #c4dbed4a; }
.person + .person { border-top: 0; }
.person div span { color: #c2d3e1; font-size: 12px; }
.person h3 { margin-top: 3px; font-size: 19px; }
.phone { color: #f4d89d; font-size: clamp(16px, 2vw, 23px); font-weight: 700; white-space: nowrap; }
.phone:hover { text-decoration: underline; }
.person button { grid-column: 2; justify-self: end; padding: 5px 0; background: none; border: 0; color: #d3e2ed; font-size: 12px; text-decoration: underline; text-underline-offset: 3px; }
.footer { color: #c5d3df; background: #07111c; font-size: 13px; }
.footer-main, .footer-end { display: flex; gap: 20px; align-items: center; justify-content: space-between; }
.footer-main { padding-block: 26px; }
.footer-end { padding-block: 15px; color: #a8bbcd; font-size: 11px; border-top: 1px solid #abc2d82f; }

dialog { width: min(920px, calc(100% - 28px)); max-height: calc(100% - 28px); padding: 19px; border: 1px solid #a2bbcf64; background: #08121e; color: white; }
dialog::backdrop { background: #01060ed9; }
dialog video { display: block; width: 100%; max-height: 68vh; background: #000; aspect-ratio: 16 / 9; }
dialog .fine { padding-top: 10px; color: #bbcdda; }
.dialog-head { display: flex; align-items: center; justify-content: space-between; gap: 15px; margin-bottom: 12px; }
.dialog-head h2 { font-size: 19px; }
.dialog-head button { flex: 0 0 34px; height: 34px; background: #203244; color: white; border: 0; font-size: 22px; }
#video-error { margin-top: 10px; color: #ffdb9f; }
.toast { position: fixed; right: 20px; bottom: 20px; z-index: 12; padding: 14px 20px; background: #173148; color: white; border: 1px solid #e6c17a; }

@media (max-width: 1190px) {
  :root { --wrap: calc(100% - 72px); }
  .header-inner { gap: 15px; }
  .header-tools { gap: 14px; }
}
@media (max-width: 1030px) {
  .header-inner { min-height: 69px; }
  .menu { display: block; }
  .navigation { position: absolute; left: 0; right: 0; top: 100%; display: none; flex-direction: column; align-items: stretch; gap: 0; background: #0a1827; padding: 7px max(26px, calc((100% - 1100px) / 2)) 14px; border-bottom: 1px solid #a3c3df45; }
  .navigation.is-open { display: flex; }
  .navigation a { padding: 13px 10px; border-bottom: 1px solid #abc2d82f; }
  .navigation a:last-child { border: 0; }
}
@media (max-width: 730px) {
  :root { --wrap: calc(100% - 40px); }
  html { scroll-padding-top: 82px; }
  .header-inner { min-height: 62px; }
  .brand { width: 125px; }
  .header-contact { display: none; }
  .hero-grid { min-height: 590px; align-items: end; padding-block: 103px 69px; }
  .hero-main { max-width: 100%; }
  .hero-art { background-position: 65% 50%; }
  .hero-art::after { background: linear-gradient(0deg, #08131ef7 2%, #071321df 38%, #07132155 78%, #050e194f 100%), linear-gradient(90deg, #0713216b, transparent); }
  .hero h1 { margin: 15px 0 14px; font-size: clamp(44px, 9.5vw, 61px); }
  html:not([lang="zh-CN"]) .hero h1 { font-size: clamp(34px, 8.2vw, 54px); }
  .hero-actions { gap: 9px; margin-top: 23px; }
  .button { padding-inline: 12px; min-height: 45px; }
  .scene { bottom: 13px; }
  .pillars { grid-template-columns: repeat(3, minmax(0, 1fr)); overflow-wrap: anywhere; }
  .pillars li { display: block; min-height: auto; padding: 10px 8px; }
  .pillars strong { margin-top: 4px; font-size: 11px; }
  .pillars small { display: none; }
  .section-copy { font-size: 15px; }
  .step-tabs { grid-template-columns: repeat(5, minmax(105px, 1fr)); overflow-x: auto; scrollbar-color: #899fad #eff1f1; }
  .step-tabs [role="tab"]:focus-visible { outline-offset: -5px; }
  .step-panel, .engineering-grid, .about-grid, .media-grid, .contact-grid, .partner { grid-template-columns: 1fr; }
  .step-panel figure { min-height: 0; aspect-ratio: 1.65; }
  .section-links { align-items: start; flex-direction: column; }
  .seams { grid-template-columns: 1fr; }
  .seams article { padding-inline: 0; }
  .seams article + article { border-left: 0; border-top: 1px solid var(--rule); }
  .engineering-image { min-height: 225px; }
  .campus { min-height: 0; aspect-ratio: 1.8; }
  .expert { grid-template-columns: minmax(95px, 130px) 1fr; }
  .film-card { min-height: 280px; }
  .media-list a { grid-template-columns: 77px 1fr 15px; }
  .footer-main { flex-wrap: wrap; justify-content: start; }
  .footer-main .text-link { margin-left: auto; }
}
@media (max-width: 460px) {
  .header-inner, .header-tools { gap: 10px; }
  .brand { width: clamp(100px, 32vw, 125px); }
  .languages { gap: 7px; }
  .expert { grid-template-columns: 1fr; }
  .expert-photo { width: min(65%, 185px); }
  .footer-end span:last-child { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}

.mobile-contact { display: none; }
@media (max-width: 730px) {
  .mobile-contact { display: block; color: var(--gold); }
}