:root {
  --bg: #f7f8fa;
  --paper: #ffffff;
  --ink: #111318;
  --muted: #707784;
  --line: #dfe3e8;
  --blue: #175cff;
  --blue-soft: #dce7ff;
  --nav-height: 76px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; }
body.dialog-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; }
button { color: inherit; }
.container { width: min(1240px, calc(100% - 64px)); margin: 0 auto; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 100; padding: 12px 16px; color: #fff; background: var(--blue); transition: top .2s; }
.skip-link:focus { top: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

.nav { position: fixed; inset: 0 0 auto; z-index: 20; height: var(--nav-height); background: rgba(247,248,250,.82); backdrop-filter: blur(16px); border-bottom: 1px solid rgba(223,227,232,.75); }
.nav-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.logo, .footer-logo { font-size: 17px; font-weight: 800; letter-spacing: .08em; }
.logo span, .footer-logo span { color: var(--blue); }
.nav-links { display: flex; gap: 29px; font-size: 12px; letter-spacing: .04em; color: #4e5662; }
.nav-links a { position: relative; padding: 29px 0; }
.nav-links a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 21px; height: 1px; background: var(--blue); transition: right .22s ease; }
.nav-links a:hover, .nav-links a.active { color: var(--blue); }
.nav-links a:hover::after, .nav-links a.active::after { right: 0; }
.nav-period { font-size: 12px; color: #68707c; }
.menu-button { display: none; width: 40px; height: 40px; border: 0; background: transparent; padding: 10px; }
.menu-button span { display: block; width: 20px; height: 1px; margin: 6px auto; background: var(--ink); }

.hero { min-height: 780px; padding-top: var(--nav-height); display: flex; align-items: center; position: relative; overflow: hidden; }
.hero-inner { position: relative; z-index: 2; padding: 100px 0 70px; }
.hero-art { position: absolute; right: -160px; top: 88px; width: 680px; height: 680px; opacity: .92; }
.hero-art::after { content: ""; position: absolute; inset: 5%; border-radius: 50%; background: radial-gradient(circle, rgba(220,231,255,.88) 0%, rgba(220,231,255,.3) 38%, rgba(220,231,255,0) 71%); }
.orbit { position: absolute; z-index: 1; border: 1px solid rgba(23,92,255,.15); border-radius: 50%; animation: orbitPulse 8s ease-in-out infinite; }
.orbit-one { inset: 8%; }.orbit-two { inset: 23%; animation-delay: -2s; }.orbit-three { inset: 38%; animation-delay: -4s; }
.node { position: absolute; z-index: 2; width: 9px; height: 9px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 7px rgba(23,92,255,.1); }
.node-a { left: 17%; top: 29%; }.node-b { right: 17%; top: 42%; }.node-c { left: 34%; bottom: 11%; }.node-d { left: 49%; top: 48%; }
@keyframes orbitPulse { 0%,100% { transform: scale(1); opacity: .65; } 50% { transform: scale(1.025); opacity: 1; } }
.eyebrow { margin-bottom: 24px; color: var(--blue); font-size: 12px; font-weight: 750; letter-spacing: .18em; }
h1 { max-width: 880px; margin: 0; font-size: clamp(60px, 8vw, 116px); font-weight: 760; line-height: .88; letter-spacing: -.065em; }
.hero-sub { max-width: 680px; margin: 34px 0 0; color: #59616d; font-size: 20px; line-height: 1.7; }
.hero-meta { display: flex; gap: 52px; margin-top: 52px; }
.metric-small strong { display: block; font-size: 27px; letter-spacing: -.04em; }
.metric-small span { color: var(--muted); font-size: 11px; letter-spacing: .13em; }
.scroll-cue { display: flex; align-items: center; gap: 14px; width: fit-content; margin-top: 58px; color: var(--muted); font-size: 12px; }
.scroll-cue i { display: grid; place-items: center; width: 30px; height: 30px; border: 1px solid var(--line); border-radius: 50%; color: var(--blue); font-style: normal; transition: transform .2s, background .2s; }
.scroll-cue:hover i { transform: translateY(4px); background: var(--paper); }

section { padding: 130px 0; border-top: 1px solid var(--line); scroll-margin-top: 74px; }
.section-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 60px; margin-bottom: 58px; }
.section-num { color: var(--blue); font-size: 12px; font-weight: 700; letter-spacing: .16em; }
h2 { margin: 10px 0 0; font-size: clamp(38px, 5vw, 72px); font-weight: 720; line-height: .95; letter-spacing: -.05em; }
.section-note { max-width: 400px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.8; }

.research-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.research-card { position: relative; min-height: 390px; padding: 30px 25px; overflow: hidden; border-right: 1px solid var(--line); transition: background .25s, color .25s, transform .25s; }
.research-card:last-child { border-right: 0; }
.research-card::before { content: ""; position: absolute; inset: auto 0 0; height: 3px; background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform .3s; }
.research-card:hover { background: var(--paper); transform: translateY(-4px); }
.research-card:hover::before { transform: scaleX(1); }
.r-num { color: var(--blue); font-size: 12px; font-weight: 700; }
.r-title { margin-top: 86px; font-size: 28px; line-height: 1.08; letter-spacing: -.03em; }
.r-cn { margin-top: 13px; color: var(--muted); font-size: 14px; }
.r-desc { margin: 25px 0 48px; color: #707784; font-size: 13px; line-height: 1.7; }
.text-button { position: absolute; right: 24px; bottom: 24px; padding: 0; border: 0; background: transparent; color: var(--muted); cursor: pointer; font-size: 12px; }
.text-button span { margin-left: 7px; color: var(--blue); font-size: 20px; vertical-align: -2px; }
.text-button:hover { color: var(--blue); }

.people { display: grid; grid-template-columns: 1.35fr repeat(3, 1fr); gap: 1px; padding: 1px; background: var(--line); }
.person { display: flex; min-height: 360px; padding: 28px; flex-direction: column; justify-content: space-between; background: var(--paper); }
.person-lead { background: var(--ink); color: white; }
.avatar { display: grid; width: 76px; height: 76px; place-items: center; border: 1px solid currentColor; border-radius: 50%; font-size: 27px; font-weight: 700; }
.person-role { margin-top: 25px; opacity: .6; font-size: 11px; letter-spacing: .16em; }
.person-name { margin-top: 8px; font-size: 32px; letter-spacing: -.04em; }
.person-focus { margin-top: 15px; color: #747c87; font-size: 13px; line-height: 1.6; }
.person-lead .person-focus { color: #aeb5bf; }
.person-tag { opacity: .55; font-size: 10px; letter-spacing: .13em; }
.other-members { display: grid; grid-template-columns: 1fr 1.5fr auto; gap: 40px; align-items: center; padding: 34px 28px; border: 1px solid var(--line); border-top: 0; background: rgba(255,255,255,.55); }
.other-members h3 { margin: 6px 0 0; font-size: 26px; letter-spacing: -.03em; }
.other-members p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.status-pill { padding: 8px 12px; border: 1px solid var(--line); color: var(--muted); font-size: 11px; }

.outputs-section { background: #f1f3f7; }
.output-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-bottom: 30px; }
.filter-group { display: flex; gap: 7px; flex-wrap: wrap; }
.filter { padding: 10px 15px; border: 1px solid #d8dde5; background: transparent; cursor: pointer; color: #59616d; font-size: 12px; transition: .2s; }
.filter:hover, .filter.active { border-color: var(--ink); background: var(--ink); color: #fff; }
.search-box { display: flex; width: min(280px, 100%); padding: 10px 0; align-items: center; border-bottom: 1px solid #aeb5bf; }
.search-box input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--ink); font-size: 12px; }
.search-box span:last-child { color: var(--blue); font-size: 20px; }
.output-list { min-height: 270px; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.output-empty { display: grid; min-height: 270px; place-items: center; text-align: center; }
.empty-symbol { width: 52px; height: 52px; margin: 0 auto 20px; border: 1px solid #aeb5bf; border-radius: 50%; color: var(--blue); font-size: 30px; line-height: 46px; }
.output-empty h3 { margin: 0; font-size: 22px; font-weight: 600; }
.output-empty p { margin: 10px 0 0; color: var(--muted); font-size: 13px; }
.output-item { display: grid; grid-template-columns: 120px 1fr 150px 30px; gap: 24px; align-items: center; padding: 25px 18px; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.35); }
.output-item:last-child { border-bottom: 0; }
.output-item:hover { background: var(--paper); }
.output-type { color: var(--blue); font-size: 11px; letter-spacing: .12em; }
.output-title { font-size: 17px; }
.output-meta { color: var(--muted); font-size: 12px; text-align: right; }
.output-arrow { color: var(--blue); }

.timeline { position: relative; padding: 35px 0 10px; }
.timeline-line { position: absolute; top: 55px; right: 0; left: 0; height: 1px; background: #aeb5bf; }
.years { position: relative; display: grid; grid-template-columns: repeat(5, 1fr); }
.year { position: relative; }
.dot { width: 13px; height: 13px; margin-bottom: 27px; border: 3px solid var(--bg); border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 1px var(--blue); }
.dot-plan { background: var(--bg); }
.year h3 { margin: 0 0 20px; font-size: 27px; }
.events { min-height: 145px; padding-left: 15px; border-left: 1px solid var(--line); }
.event-label { font-size: 13px; font-weight: 650; }
.events p { max-width: 150px; margin: 7px 0 21px; color: var(--muted); font-size: 12px; line-height: 1.55; }
.events span { color: #9aa1ac; font-size: 11px; }

.impact-grid { display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.impact { min-height: 180px; padding: 30px 18px; border-right: 1px solid var(--line); }
.impact:last-child { border-right: 0; }
.impact strong { display: block; min-height: 74px; font-size: clamp(43px, 5vw, 66px); font-weight: 650; line-height: 1; letter-spacing: -.06em; }
.impact span { display: block; min-height: 28px; color: var(--muted); font-size: 10px; letter-spacing: .11em; }
.impact small { color: #a2a8b1; font-size: 10px; }

.app-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 70px; align-items: stretch; }
.app-visual { position: relative; min-height: 410px; overflow: hidden; background: var(--ink); color: white; }
.ring { position: absolute; left: 50%; top: 50%; border: 1px solid #343943; border-radius: 50%; transform: translate(-50%, -50%); }
.ring-one { width: 390px; height: 390px; }.ring-two { width: 230px; height: 230px; }
.core { position: absolute; z-index: 2; left: 50%; top: 50%; display: grid; width: 154px; height: 154px; place-items: center; border-radius: 50%; transform: translate(-50%, -50%); background: #fff; color: var(--ink); text-align: center; font-size: 12px; font-weight: 750; line-height: 1.4; }
.app-label { position: absolute; z-index: 3; color: #b9c0cb; font-size: 11px; letter-spacing: .08em; }
.l1 { left: 38px; top: 34px; }.l2 { right: 30px; top: 50%; }.l3 { left: 50%; bottom: 34px; }.l4 { left: 30px; top: 50%; }
.app-copy { display: flex; flex-direction: column; justify-content: center; }
.app-copy h3 { margin: 0 0 25px; font-size: 43px; font-weight: 650; line-height: 1; letter-spacing: -.045em; }
.app-copy p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.8; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 28px; }
.chips span { padding: 9px 13px; border: 1px solid var(--line); font-size: 12px; }
.data-note { display: flex; gap: 9px; align-items: center; margin-top: 30px; color: #9299a4; font-size: 11px; }
.data-note i { width: 6px; height: 6px; border-radius: 50%; background: var(--blue); }
.support { display: flex; justify-content: space-between; align-items: center; gap: 40px; }
.support h2 { font-size: 42px; }
.support-placeholder { min-width: 360px; padding: 26px 34px; border: 1px dashed #bfc5cf; color: var(--muted); text-align: center; font-size: 13px; }

footer { padding: 52px 0; border-top: 1px solid var(--line); color: #7a818c; }
.footer-inner { display: flex; justify-content: space-between; gap: 40px; }
.footer-inner p { margin: 10px 0 0; font-size: 12px; }
.footer-meta { display: flex; flex-direction: column; gap: 10px; align-items: flex-end; font-size: 11px; letter-spacing: .07em; }

.research-dialog { width: min(620px, calc(100% - 36px)); padding: 54px; border: 0; background: var(--paper); color: var(--ink); box-shadow: 0 28px 100px rgba(17,19,24,.22); }
.research-dialog::backdrop { background: rgba(17,19,24,.55); backdrop-filter: blur(5px); }
.dialog-close { position: absolute; right: 24px; top: 19px; border: 0; background: transparent; cursor: pointer; color: var(--muted); font-size: 30px; }
.dialog-number { color: var(--blue); font-size: 12px; font-weight: 700; letter-spacing: .15em; }
.research-dialog h3 { margin: 18px 0; font-size: 40px; line-height: 1.1; letter-spacing: -.04em; }
.research-dialog p { color: var(--muted); font-size: 14px; line-height: 1.8; }
.dialog-topics { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 28px; }
.dialog-topics span { padding: 8px 11px; border: 1px solid var(--line); font-size: 11px; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation: none !important; transition: none !important; } .reveal { opacity: 1; transform: none; } }

@media (max-width: 900px) {
  .container { width: min(100% - 36px, 1240px); }
  .nav-links { position: fixed; inset: var(--nav-height) 0 auto; display: none; padding: 18px; flex-direction: column; gap: 0; background: rgba(247,248,250,.98); border-bottom: 1px solid var(--line); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 15px 12px; border-bottom: 1px solid var(--line); }
  .nav-links a::after { display: none; }
  .nav-period { margin-left: auto; margin-right: 12px; }
  .menu-button { display: block; }
  .hero { min-height: 710px; }
  .hero-art { right: -380px; opacity: .66; }
  .research-grid { grid-template-columns: 1fr 1fr; }
  .research-card:nth-child(2) { border-right: 0; }
  .research-card:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .people { grid-template-columns: 1fr 1fr; }
  .person-lead { grid-column: 1 / -1; }
  .other-members { grid-template-columns: 1fr; gap: 18px; }
  .status-pill { width: fit-content; }
  .years { grid-template-columns: 1fr 1fr; gap: 38px 0; }
  .timeline-line { display: none; }
  .impact-grid { grid-template-columns: repeat(2, 1fr); }
  .impact:nth-child(2n) { border-right: 0; }
  .impact { border-bottom: 1px solid var(--line); }
  .impact:last-child { border-bottom: 0; }
  .app-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .nav-period { font-size: 10px; }
  h1 { font-size: 58px; }
  .hero-sub { font-size: 16px; }
  .hero-meta { gap: 25px; }
  .metric-small strong { font-size: 23px; }
  section { padding: 92px 0; }
  .section-head { display: block; margin-bottom: 42px; }
  .section-note { margin-top: 24px; }
  .research-grid, .people, .years, .impact-grid { grid-template-columns: 1fr; }
  .research-card { min-height: 350px; border-right: 0 !important; border-bottom: 1px solid var(--line); }
  .research-card:last-child { border-bottom: 0; }
  .person-lead { grid-column: auto; }
  .output-toolbar { align-items: stretch; flex-direction: column; }
  .search-box { width: 100%; }
  .output-item { grid-template-columns: 1fr auto; }
  .output-meta { text-align: left; }
  .output-arrow { grid-column: 2; grid-row: 1 / 3; }
  .impact { border-right: 0; }
  .impact strong { min-height: 60px; }
  .app-visual { min-height: 350px; }
  .ring-one { width: 330px; height: 330px; }
  .support, .footer-inner { align-items: flex-start; flex-direction: column; }
  .support-placeholder { width: 100%; min-width: 0; }
  .footer-meta { align-items: flex-start; }
  .research-dialog { padding: 45px 27px 34px; }
  .research-dialog h3 { font-size: 32px; }
}