:root{--paper:#f3eee1;--ink:#173c35;--muted:#627166;--line:#d0d3bf;--red:#a44a32;--gold:#ab8750}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.85 -apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif}a{color:inherit;text-underline-offset:4px}button{font:inherit;cursor:pointer}header{max-width:1320px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:22px 32px;border-bottom:1px solid var(--line)}header>a:first-child{font-weight:800;font-size:24px;text-decoration:none}header span{color:var(--muted);font-size:13px}main{max-width:1240px;margin:auto;padding:0 32px}.hero{padding:70px 0 44px;max-width:960px}.eyebrow{color:var(--red);font-size:12px;letter-spacing:.12em;font-weight:700}h1{font-family:'Songti SC',STSong,serif;font-size:clamp(38px,5.6vw,72px);font-weight:600;line-height:1.25;letter-spacing:-.03em;margin:20px 0 28px}.hero>p{font-size:21px;max-width:850px}.abstract{padding:22px 26px;border-left:3px solid var(--gold);background:#e8e8d8;font-size:17px;line-height:2}.fine,.hero .fine{font-size:12px;color:var(--muted)}nav{display:flex;flex-wrap:wrap;gap:10px 23px;border-block:1px solid var(--line);padding:17px 0}nav a{font-size:14px;text-decoration:none}section{padding:64px 0;border-bottom:1px solid var(--line);scroll-margin-top:20px}h2{font-family:'Songti SC',STSong,serif;font-size:clamp(28px,3vw,40px);line-height:1.35;margin:15px 0}h3{font-size:19px;line-height:1.5;margin:0 0 10px}.lead{font-size:19px;max-width:1000px;color:#3f5a4f;margin:0 0 28px}p{margin:0 0 13px}figure{margin:26px 0 35px}figure img{display:block;width:100%;height:auto;border:1px solid var(--line)}figcaption{font-size:13px;color:var(--muted);line-height:1.7;margin-top:10px}figcaption a{white-space:nowrap}.three,.two,.refs{display:grid;gap:24px}.three{grid-template-columns:repeat(3,1fr)}.two,.refs{grid-template-columns:repeat(2,1fr)}article{min-width:0}article p{font-size:15px;color:#40594c}.three article,.two>article{border-top:2px solid #8d9e83;padding-top:20px}.callout{margin:28px 0 0;padding:26px 30px;background:#e4e7d7;border-left:3px solid var(--ink)}.callout>b{display:block;font-size:20px;margin-bottom:12px}.callout p:last-child{margin:0}.steps{padding:0;list-style:none;margin:28px 0}.steps li{display:grid;grid-template-columns:135px 1fr;gap:20px;padding:20px 0;border-top:1px solid var(--line)}.steps li>span{color:var(--red);font-weight:700}.steps h3{margin-bottom:6px}.steps p{margin:0}.note{font-size:13px;color:var(--muted);margin-top:24px}.worlds small{color:var(--red);font-size:12px}.worlds h3{margin-top:8px}.flow{display:flex;flex-wrap:wrap;align-items:center;gap:13px;margin:30px 0;padding:24px 0;border-block:1px solid var(--line)}.flow span{font-size:19px;font-weight:600}.flow i{font-style:normal;color:var(--red)}.two figure{margin-top:0}.ref{border:1px solid var(--line);background:#e9e8da;overflow:hidden}.ref>img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block}.ref>div{padding:20px 24px}.ref small{color:var(--red)}.ref h3{font-size:22px;margin:5px 0 10px}.links{display:flex;align-items:center;gap:18px;margin-top:16px;font-size:14px}.links button,.button{border:0;background:var(--ink);color:var(--paper);padding:10px 18px;text-decoration:none;font-weight:600;border-radius:3px}.links button:hover,.button:hover{background:#295b4d}details{margin-top:30px;border-block:1px solid var(--line);padding:20px 0}summary{font-size:18px;cursor:pointer;font-weight:600}.source-list{padding-left:22px}.source-list li{margin:15px 0}.math{padding:24px;border:1px solid var(--line);margin-top:26px}.actions{display:flex;align-items:center;gap:24px;flex-wrap:wrap;margin-top:30px}footer{max-width:1240px;padding:35px 32px 65px;margin:auto;color:var(--muted);font-size:13px}dialog{width:min(960px,94vw);border:1px solid var(--line);background:var(--paper);color:var(--ink);padding:22px;max-height:94vh;overflow:auto}dialog::backdrop{background:#061b17db}.dialog-head{display:flex;justify-content:space-between;gap:15px;align-items:center}.dialog-head button{border:0;background:transparent;color:var(--ink)}video{width:100%;max-height:65vh;background:#101c18;display:block;margin:16px 0}#video-status{font-size:13px}dialog a{font-size:14px}:focus-visible{outline:3px solid var(--red);outline-offset:4px}@media(max-width:700px){body{font-size:16px}header{padding:16px 20px}header span{font-size:11px}main{padding:0 20px}.hero{padding:44px 0 30px}.hero>p{font-size:18px}.abstract{padding:17px 18px;font-size:15px;line-height:1.9}nav{gap:11px 22px}.three,.two,.refs{grid-template-columns:1fr;gap:24px}section{padding:42px 0}.lead{font-size:17px}figure{margin:22px -8px 25px}figcaption{padding:0 8px;font-size:12px}.steps li{grid-template-columns:1fr;gap:5px;padding:17px 0}.steps h3{font-size:18px}.steps p{font-size:15px}.callout{padding:20px}.flow{gap:9px}.flow span{font-size:16px}.ref>div{padding:18px}.actions{gap:16px}footer{padding:30px 20px 50px}dialog{padding:15px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}