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@font-face{font-family:Newsreader;src:url('fonts/newsreader.woff2?v=175a378682') format('woff2');font-display:swap;font-weight:200 800}
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@keyframes galaxy-drift{from{transform:scale(1.035) translate3d(-1.6%,1.1%,0)}to{transform:scale(1.13) translate3d(1.6%,-1.2%,0)}}
h1,h2,h3{text-wrap:balance}
@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}.cosmos-image{animation:galaxy-drift 38s ease-in-out infinite alternate}.cosmic-backdrop[data-motion=paused] .cosmos-image{animation-play-state:paused}}
@media(min-width:1700px){.cosmos{max-height:1100px}.hero-content{min-height:760px}.cosmos h1{font-size:100px}}
@media(max-width:900px){.site-nav{gap:23px}.site-nav .language{padding-left:18px;margin-left:0}.brand{gap:10px}.brand span{font-size:14px}.site-header{height:86px}.cosmos,.hero-content{min-height:700px}.home-grid{grid-template-columns:140px 1fr;gap:35px}.research-deck,.research-section{grid-template-columns:125px 1fr;gap:30px}.research-hero{padding-top:58px}.research h1{font-size:46px}.home-section{padding-top:84px;padding-bottom:88px}}
@media(max-width:900px){.site-header{height:78px}.brand strong{font-size:18px}.brand span{font-size:14px}.menu-toggle{display:block}.site-nav{display:none;position:absolute;left:0;right:0;top:77px;background:#0a0f1e;padding:16px 24px 24px;border-bottom:1px solid rgba(255,255,255,.15);gap:6px;flex-direction:column;align-items:stretch}.site-nav.open{display:flex}.site-nav a{padding:10px 0}.site-nav .language{margin:0;padding:10px 0;border-left:0}.research .site-nav{background:var(--paper);border-color:var(--rule)}}
@media(max-width:650px){.cosmos,.hero-content{min-height:690px;height:100svh;max-height:950px}.hero-content{justify-content:center;padding-top:96px;padding-bottom:105px}.cosmos h1{font-size:52px;line-height:1.3}.cosmos .eyebrow{font-size:10px;margin-bottom:22px}.cosmos .hero-lead{font-size:18px;max-width:285px;margin-top:29px;line-height:1.9}.hero-bottom{bottom:24px;font-size:10px}.home-grid{grid-template-columns:1fr;gap:26px}.home-section{padding-top:62px;padding-bottom:70px}.home h2{font-size:32px;line-height:1.55}.home-prose>p{font-size:15px;margin-top:23px}.home-reading{flex-direction:column;align-items:flex-start;padding-top:46px;padding-bottom:49px;gap:22px}.home-reading h2{font-size:25px}.home-reading p{font-size:13px}.project-name{margin-bottom:22px}.project-name strong{font-size:26px}.site-footer{padding-top:31px}.footer-top{flex-direction:column;align-items:flex-start;gap:21px}.footer-links{gap:18px;font-size:11px}.footer-legal{line-height:1.9;font-size:9px}.research-hero{padding:39px 0 34px}.research-meta{margin-bottom:26px;gap:12px}.research-meta .eyebrow{font-size:9px;letter-spacing:.12em}.status{font-size:10px}.research h1{font-size:37px;line-height:1.45;letter-spacing:-.02em}.research-deck{grid-template-columns:1fr;gap:14px;margin-top:27px}.research-deck .name{font-size:23px}.research-deck p{font-size:15px}.contents{gap:10px 24px;font-size:11px;padding:17px 0}.research-section{grid-template-columns:1fr;gap:21px;padding:42px 0 48px}.margin-note{display:flex;align-items:center;gap:14px;padding:0;font-size:10px}.margin-note span{font-size:23px;line-height:1;margin:0}.research h2{font-size:28px;line-height:1.5;margin-bottom:22px}.research-body>p{font-size:15px}.scenario-conditions{margin:25px 0 23px}.scenario-conditions>div{font-size:13px;padding:18px 10px 18px 0}.scenario-conditions>div+div{padding-left:12px}.scenario-result{font-size:23px!important}.editorial-note{font-size:14px;padding-left:17px}.principle p{font-size:14px}.open-questions li p{font-size:15px}.research-end{padding:31px 0 45px;flex-direction:column;gap:12px;font-size:11px}.research-end a{align-self:flex-start}}
@media(max-width:650px){html[lang=zh-CN] .research h1{font-size:clamp(25px,7.65vw,33px)}}

/* Production footer includes every section and language, on both page styles. */
.footer-links{justify-content:flex-end;align-items:center;max-width:820px}
.margin-note,.margin-note span,.scenario-conditions small,.research-end,.research .footer-legal,.contents span{color:#626a60}
@media(max-width:900px){.footer-top{flex-direction:column;align-items:flex-start}.footer-links{justify-content:flex-start}}

/* Restore the original deep-blue palette without solid blocks hiding the sky. */
.home .site-header{color:#f2f5ff;border-color:rgba(143,163,217,.22)}
.home .home-prose{position:relative;isolation:isolate;text-shadow:0 1px 15px #0a0f1e}
.home .home-prose:before{content:'';position:absolute;inset:-40px -35px;z-index:-1;background:radial-gradient(ellipse closest-side,rgba(10,15,30,.70),rgba(10,15,30,.32) 62%,transparent 100%);pointer-events:none}
.home .site-footer{background:rgba(10,15,30,.34)}
.home .status:before{background:#8daaff}
.home .text-link{color:#c5d5ff}
.home ::selection{background:#5b8cff;color:white}
@media(max-width:650px){.home .home-prose:before{inset:-24px -18px}.cosmic-backdrop:before{background:linear-gradient(90deg,rgba(10,15,30,.62),rgba(15,27,56,.22)),linear-gradient(0deg,rgba(10,15,30,.50),transparent 45%,rgba(10,15,30,.28))}}
@media(prefers-reduced-motion:reduce){.cosmos-image{transition:none;will-change:auto}}

/* Readable at normal browser zoom: labels are navigation, not fine print. */
body{font-size:18px}
.brand strong{font-size:22px}html[lang="zh-CN"] .brand strong{font-family:var(--serif);font-weight:400;letter-spacing:.12em}.brand span{font-size:18px}
.site-nav,.menu-toggle{font-size:16px}.menu-toggle{min-height:44px;padding:5px 14px}
.eyebrow{font-size:17px;letter-spacing:.1em}.cosmos .eyebrow{font-size:18px}
.hero-bottom{bottom:48px}
.hero-bottom,.section-index{font-size:18px;line-height:1.7;letter-spacing:.04em;color:#b8c8eb}
.scroll-link{min-height:44px;gap:20px}.scroll-link span:last-child{font-size:26px}
.cosmos .hero-lead{font-size:clamp(22px,1.75vw,27px)}
.home-prose>p{font-size:20px;line-height:1.95;max-width:740px}
.text-link{font-size:18px;min-height:44px}.home-reading p{font-size:18px}
.project-name span,.status{font-size:16px}.project-name{flex-wrap:wrap;gap:8px 20px}
.footer-links,.site-footer{font-size:16px}.footer-links a{padding:5px 0}
.footer-brand{font-size:22px;white-space:nowrap}.footer-brand small{font-size:14px}
.footer-legal{font-size:14px;line-height:1.9}
.research-meta .eyebrow{font-size:16px;letter-spacing:.08em}.research-meta{flex-wrap:wrap}
.research-deck p,.research-body>p,.open-questions li p{font-size:19px;line-height:1.95}
.contents{font-size:16px;gap:14px 28px}.contents a{padding:4px 0}.contents span{font-size:14px}
.margin-note{font-size:16px;letter-spacing:.04em}
.editorial-note,.principle p,.scenario-conditions>div{font-size:18px}
.principle h3{font-size:20px}.scenario-conditions small{font-size:14px}
.research-end{font-size:16px;align-items:flex-start}.research-end a{min-height:44px}
@media(max-width:900px){
  .brand strong{font-size:20px}.brand span{font-size:16px}
  .home-reading{flex-wrap:wrap;align-items:flex-start}.home-reading .text-link{white-space:normal}
}
@media(max-width:650px){
  body{font-size:17px}
  .cosmos .eyebrow,.hero-bottom,.section-index{font-size:16px}
  .cosmos .hero-lead{font-size:20px;max-width:100%;line-height:1.85}
  .hero-bottom{bottom:20px}.home-section{padding-top:48px;padding-bottom:56px}
  .home-grid{gap:20px}.home-prose>p{font-size:18px;line-height:1.95}
  .text-link,.home-reading p{font-size:17px}
  .project-name span,.status{font-size:15px}
  .footer-links,.site-footer{font-size:16px}.footer-legal{font-size:14px}
  .footer-brand small{font-size:14px}.footer-links{gap:8px 22px}
  .research-meta{flex-direction:column;align-items:flex-start;gap:10px}
  .research-meta .eyebrow{font-size:16px;letter-spacing:.06em}
  .research-deck p,.research-body>p,.open-questions li p{font-size:18px}
  .contents,.margin-note,.research-end{font-size:16px}
  .contents{gap:8px 22px}.contents span,.scenario-conditions small{font-size:14px}
  .editorial-note,.principle p,.scenario-conditions>div{font-size:17px}
  .principle h3{font-size:19px}
  .scenario-conditions{grid-template-columns:1fr}
  .scenario-conditions>div{padding:18px 0}
  .scenario-conditions>div+div{border-left:0;border-top:1px solid var(--rule);padding-left:0}
}

/* Keep the approved bilingual promotional films with the Perthy introduction. */
.research-film{max-width:640px;margin:0 0 54px 210px}
.research-film-player{display:block;width:100%;height:auto;aspect-ratio:16/9;background:#0a0f1e;object-fit:contain}
.home .research-film{margin:30px 0 0}
@media(max-width:900px){.research-film{margin-left:155px}}
@media(max-width:650px){.research-film{margin-left:0;margin-bottom:34px}.home .research-film{margin:24px 0 0}}

/* The introduction and film share one column at every viewport width. */
.research-deck{grid-template-columns:170px minmax(0,640px);max-width:none}
.research-intro{min-width:0}
.research-deck p{max-width:none;text-wrap:pretty}
html[lang=zh-CN] .research-intro>p{text-align:left}
.keep-together{white-space:nowrap}
.research-intro .research-film{max-width:none;margin:32px 0 0}
@media(max-width:900px){.research-deck{grid-template-columns:125px minmax(0,640px)}}
@media(max-width:650px){.research-deck{grid-template-columns:minmax(0,1fr)}.research-intro .research-film{margin-top:24px}}
.research-body p{ text-wrap:pretty }

/* Public Perthy introduction, 2026-10-07. */
.product-actions{display:flex;flex-wrap:wrap;align-items:center;gap:16px 30px;margin-top:28px}
.product-actions .text-link{margin:0;gap:18px}
/* A light blue tint keeps the invitation in the page's editorial rhythm. */
.app-link{display:inline-flex;align-items:center;justify-content:center;gap:14px;min-height:46px;padding:10px 22px;background:#e8edf0;color:#466c8b;border:1px solid #c8d4dc;border-radius:999px;font-size:16px;line-height:1.5;font-weight:400;transition:background-color .18s ease,border-color .18s ease,color .18s ease}
.app-link-arrow{flex:none;width:16px;height:16px}
.app-link:hover{background:#dce7ee;border-color:#9db5c7;color:#305674}.app-link:focus-visible{outline-color:#5b9bd5;outline-offset:4px}
.home .app-link{background:rgba(155,188,223,.08);border-color:rgba(183,205,234,.38);color:#c5d5ee;text-shadow:none}.home .app-link:hover{background:rgba(155,188,223,.16);border-color:rgba(183,205,234,.6);color:#e0e9f7}
@media(prefers-reduced-motion:reduce){.app-link{transition:none}}
.research-intro .product-premise{margin-top:20px;color:#283b30}
.research-intro .product-definition{margin-top:24px;font-size:16px;color:#626a60}
.case-photo{margin:30px 0 24px}.case-photo img{display:block;width:100%;height:auto;border-radius:2px}.case-photo figcaption{font-size:16px;color:#626a60;margin-top:12px;line-height:1.8}
.research-end{align-items:center}.research-end .app-link{align-self:auto}
@media(max-width:650px){.product-actions{gap:14px 24px}.app-link{min-height:48px}.research-end{align-items:flex-start}.case-photo{margin-top:24px}}

/* Read the product promise as a complete sentence, without forced line breaks. */
.project-section .home-prose>p{text-wrap:pretty}
.research h1.perthy-title{font-size:clamp(36px,4vw,48px);line-height:1.45;letter-spacing:0;max-width:22ch;text-wrap:pretty}
.project-section h2.perthy-title{font-size:clamp(30px,3.1vw,42px);line-height:1.5;letter-spacing:0;max-width:24ch;text-wrap:pretty}
html[lang=zh-CN] .perthy-title{max-width:none}
@media(max-width:650px){.research h1.perthy-title,.project-section h2.perthy-title{font-size:clamp(27px,7.2vw,32px);line-height:1.5}}