/* 首页独立设计层，保留研究路径、三类任务和参与方式的内容结构。 */
.home{background:var(--paper)}
body.home::before{position:absolute;height:680px;background:radial-gradient(ellipse at 92% 12%,#c7d6e94a,transparent 60%)}
[data-theme=dark] body.home::before{background:radial-gradient(ellipse at 92% 12%,#4b62852e,transparent 60%)}
.home .lab-main{max-width:1208px;padding:0 24px 40px}
.home-hero{display:grid;grid-template-columns:1.2fr 1fr;gap:56px;padding:76px 0 72px;align-items:center}
.home .eyebrow{font-size:10px;letter-spacing:2px;font-weight:400;color:var(--muted)}
.research-state{display:inline-flex;gap:8px;align-items:center;margin:25px 0 23px;font-size:11px;color:var(--accent)}
.state-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px #7a96bc18}
.home h1{font-family:var(--serif);font-size:clamp(32px,3.7vw,50px);line-height:1.55;letter-spacing:1px;font-weight:400}
.home h1 em{font-style:normal;color:var(--accent)}
.hero-description{font-size:14px;max-width:485px;color:var(--muted);line-height:2.1;margin-top:22px}
.hero-footnote{font-size:10px;letter-spacing:1px;color:var(--muted);margin-top:25px}
.home .text-link{font-size:13px;text-decoration:none;color:var(--ink)}
.home .btn{border-radius:6px;font-size:13px;min-height:44px;min-width:0;padding:9px 22px}
.home .actions{justify-content:flex-start;border:0;padding:0;margin-top:24px}
.research-map{height:355px;background:linear-gradient(135deg,#e9eef4df,#f5f7fbe8),url('/site-assets/twilight-scene.webp') center/cover;border:1px solid var(--line);position:relative;border-radius:120px 120px 8px 8px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.map-caption,.map-bottom{position:absolute;font-size:8px;letter-spacing:2px;color:var(--muted);text-align:center;left:12px;right:12px}
.map-caption{top:26px}.map-bottom{bottom:22px}
.map-orbit{width:224px;height:224px;border:1px solid #91a5c066;border-radius:50%;position:relative;display:grid;place-items:center;transform:rotate(-12deg)}
.map-orbit::before{content:'';position:absolute;inset:24px;border:1px dashed #91a5c066;border-radius:50%}
.map-center{display:grid;place-content:center;text-align:center;gap:4px;transform:rotate(12deg)}
.map-center>span{font-family:var(--serif);font-size:32px}.map-center small{font-size:10px;letter-spacing:2px;color:var(--muted)}
.map-node{position:absolute;background:var(--panel);border:1px solid var(--line);box-shadow:0 6px 15px #23334d08;padding:8px 13px;display:flex;align-items:center;gap:8px;border-radius:5px;transform:rotate(12deg);white-space:nowrap;font-size:12px}
.map-node small{font-size:9px;color:var(--muted);font-variant-numeric:tabular-nums}.node-0{top:1px;left:-18px}.node-1{right:-35px;top:70px}.node-2{bottom:1px;right:-18px}.node-3{left:-35px;bottom:70px}
.experiment-section{border-top:1px solid var(--line);padding:35px 0 45px;scroll-margin-top:24px}
.section-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:24px}
.home h2{font-family:var(--serif);font-size:24px;line-height:1.6;margin-top:9px;letter-spacing:.5px}.section-note{font-size:11px;color:var(--muted);padding-bottom:4px;white-space:nowrap}
.experiment-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px}
.experiment-card{border:1px solid var(--line);border-radius:8px;padding:23px;background:var(--panel);display:flex;flex-direction:column;transition:border-color .2s,transform .2s}
.experiment-card:hover{border-color:var(--accent);transform:translateY(-2px)}
.experiment-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:23px}.experiment-letter{font:italic 36px/1 var(--serif);color:var(--accent)}.experiment-card .chip{border:1px solid var(--line);background:transparent;font-size:10px;border-radius:4px}
.experiment-card h3{font-size:18px;font-family:var(--serif);margin-bottom:11px}.experiment-card>p{font-size:12px;color:var(--muted);line-height:2;min-height:48px}
.task-flow{display:flex;flex-wrap:wrap;gap:5px;list-style:none;padding:18px 0 20px;margin:0;font-size:10px;color:var(--muted)}.task-flow li+li::before{content:'→';padding-right:5px;opacity:.65}
.demo-link{border:0;border-top:1px solid var(--line);background:transparent;color:var(--accent);text-align:left;padding:15px 0 0;font-size:12px;cursor:pointer;margin-top:auto}
.participation-section{border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:90px;padding:40px 0 44px;scroll-margin-top:24px}.participation-section>div>.muted{font-size:13px;line-height:2.1;margin-top:16px;max-width:400px}.participation-steps{display:grid;grid-template-columns:1fr 1fr;gap:25px 20px}.participation-steps>div{display:flex;gap:12px}.participation-steps>div>span{font:italic 20px var(--serif);color:var(--muted)}.participation-steps h3{font-size:13px;margin-bottom:5px}.participation-steps p{font-size:11px;color:var(--muted);line-height:1.9}
.privacy-strip{background:var(--chip);border:1px solid var(--line);border-radius:7px;padding:23px 28px;display:flex;align-items:center;justify-content:space-between;gap:28px}.privacy-strip h2{font-size:18px;margin:0}.privacy-strip p{font-size:12px;color:var(--muted);margin-top:8px;max-width:700px}.privacy-strip a{white-space:nowrap;font-size:12px}.home-disclosure{font-size:10px;line-height:1.9;color:var(--muted);max-width:850px;margin:22px 0 0}
[data-theme=dark] .research-map{background:linear-gradient(135deg,#24344ac9,#1d2a40de),url('/site-assets/twilight-scene.webp') center/cover}
@media(max-width:900px){.home-hero{gap:30px;padding:48px 0}.research-map{height:320px}.map-orbit{width:190px;height:190px}.map-node{padding:7px 10px;font-size:10px}.map-center>span{font-size:28px}.participation-section{gap:35px}.experiment-card{padding:18px}.home h2{font-size:21px}.experiment-card h3{font-size:17px}}
@media(max-width:650px){.home .lab-main{padding:0 20px 30px}.home-hero{grid-template-columns:1fr;padding:32px 0;gap:28px}.home h1{font-size:34px}.hero-description{font-size:13px}.hero-footnote{font-size:9px}.research-map{height:260px;border-radius:80px 80px 6px 6px}.map-orbit{width:166px;height:166px}.map-caption{top:15px}.map-bottom{bottom:14px}.experiment-section{padding:27px 0}.section-heading{display:block}.section-note{display:block;margin-top:12px}.experiment-grid{grid-template-columns:1fr;gap:14px}.experiment-card{padding:22px}.experiment-top{margin-bottom:16px}.experiment-card>p{min-height:0}.task-flow{padding:14px 0}.experiment-card h3{font-size:21px}.participation-section{grid-template-columns:1fr;padding:30px 0;gap:26px}.privacy-strip{display:block;padding:22px}.privacy-strip a{display:inline-block;margin-top:14px}.home .actions .btn{flex:0 1 auto}.home .actions{gap:18px}}
@media(prefers-reduced-motion:reduce){.experiment-card{transition:none}.experiment-card:hover{transform:none}}
/* 静态细节与短交互，不使用常驻动画、模糊滤镜或新增素材。 */
.home h1 em{background:linear-gradient(100deg,var(--accent),#5f7fa8 80%);-webkit-background-clip:text;background-clip:text;color:transparent}
.research-state{border:1px solid var(--line);padding:5px 12px;border-radius:30px;background:var(--panel)}
.hero-copy{position:relative}
.hero-footnote{padding-left:12px;border-left:2px solid var(--line)}
.research-map{box-shadow:var(--shadow)}
.research-map::before{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#91a5c014 1px,transparent 1px),linear-gradient(#91a5c014 1px,transparent 1px);background-size:32px 32px;pointer-events:none}
.research-map::after{content:'';position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at 50% 108%,#f3c99a33,transparent 55%)}
.experiment-card{position:relative;overflow:hidden}
.experiment-card::before{content:'';position:absolute;left:23px;top:0;width:38px;height:3px;background:var(--accent)}
.experiment-card::after{content:attr(data-letter);position:absolute;right:14px;bottom:-26px;font:italic 150px/1 var(--serif);color:var(--accent);opacity:.05;pointer-events:none}
.experiment-card>*{position:relative}
.experiment-card:focus-within{border-color:var(--accent)}
.demo-link{display:flex;justify-content:space-between;min-height:44px;align-items:center;padding-top:10px}
.demo-link::after{content:'→';font-size:18px;transition:transform .15s}
.demo-link:hover::after{transform:translateX(4px)}
.section-heading h2,.participation-section h2{position:relative}
.participation-steps{position:relative}
.participation-steps>div>span{display:grid;place-items:center;flex:none;width:32px;height:32px;border:1px solid var(--line);border-radius:50%;background:var(--panel);font:italic 13px var(--serif);color:var(--accent)}
.privacy-strip{background:linear-gradient(110deg,var(--chip),transparent 80%),var(--panel);border-left:3px solid var(--accent)}
.lab-footer{margin-top:8px}
[data-theme=dark] .home h1 em{background-image:linear-gradient(100deg,var(--accent),#8fb0d8 80%)}