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[hidden]{display:none!important}
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
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/* Second editorial pass: each mechanism has one dominant visual claim. */
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@media(max-width:960px){.geometry-live-grid{gap:20px}.geometry-live-controls{gap:20px;grid-template-columns:1fr 1fr 1.2fr}.geometry-live-controls button{grid-column:1/-1;justify-self:center}.event-order-figure .figure-grid-three>div{max-width:430px}}
@media(max-width:700px){.geometry-live-grid,.measurement-setup{grid-template-columns:1fr}.geometry-live-panel{max-width:470px;width:100%;margin:auto}.geometry-live-grid{gap:24px}.mechanism-main-formula{font-size:16px}.geometry-live-controls{grid-template-columns:1fr 1fr;gap:20px 22px;padding:18px 3px}.geometry-live-controls label:nth-child(3){grid-column:1/-1}.geometry-live-controls button{width:100%;max-width:260px}.mechanism-update{font-size:12px;padding:12px}.ns-view{grid-template-columns:1fr;gap:0}.ns-view svg{max-width:450px;margin:auto}.ns-readout{display:flex;justify-content:center;gap:20px;font-size:12px}.ns-controls{flex-wrap:wrap;gap:10px}.ns-formula{font-size:13px}.shared-curvature{padding:10px 7px 20px;font-size:12px}.shared-curvature .math.display{font-size:24px}.matrix-conclusion{font-size:20px;text-align:left}.same-s-figure>.figure-grid>a{max-width:520px;margin:auto}.event-order-figure .figure-grid{gap:25px}.event-order-figure .figure-grid h4{padding-left:17px}.measurement-setup{gap:22px;padding:18px 15px}.setup-equation{font-size:13px}.measurement-setup>div+div{border-top:1px solid var(--line);padding-top:17px}}
@media print{.geometry-live-controls,.ns-controls{display:none!important}.geometry-live-grid,.measurement-setup{grid-template-columns:1fr 1fr}.shared-curvature .math.display{font-size:22px}.matrix-conclusion{font-size:16px}.geometry-live-panel{background:white}.geometry-live-panel svg{max-height:210px}.event-order-figure .figure-grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}.ns-demo{break-inside:avoid}}

/* Article navigation and the animated lead figure — advisor revision. */
.article-shell{max-width:1500px;display:grid;grid-template-columns:190px minmax(0,1140px);gap:42px;align-items:start;padding:64px 32px 90px}
.article-shell>article{min-width:0}
.article-sidebar{position:sticky;top:32px;align-self:start}
.article-sidebar .article-toc{display:flex;flex-direction:column;gap:3px;border:0;border-left:1px solid var(--line);margin:0;padding:0 0 0 15px;max-height:calc(100vh - 64px);overflow:auto;font-size:12px;line-height:1.65}
.article-sidebar .article-toc span{padding:0 9px 12px;font-size:10px;letter-spacing:.13em}
.article-sidebar .article-toc a{display:block;padding:7px 9px;border-radius:4px}
.article-sidebar .article-toc a:hover,.article-sidebar .article-toc a[aria-current="location"]{background:#edf3f8;color:var(--accent)}
.article-sidebar .article-toc a[aria-current="location"]{box-shadow:inset 2px 0 var(--accent);font-weight:650}
.article-sidebar .article-toc .toc-paper{border-top:1px solid var(--line);border-radius:0;margin:13px 9px 0;padding:15px 0 0;color:var(--accent)}
#fig-1{scroll-margin-top:28px}
.research-figure.hero-animated{padding:12px 12px 20px;background:#f7f9fb}
.hero-animated picture{display:block;background:#fff;border-radius:7px;overflow:hidden}
.hero-animated picture img{width:100%;height:auto}
.hero-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:12px 20px;padding:16px 12px 0;font-size:12px;line-height:1.6}
.hero-toolbar button{appearance:none;border:1px solid #cad7e2;background:#fff;color:var(--accent);border-radius:5px;padding:7px 12px;font-family:inherit;font-size:12px;font-weight:600;line-height:1.5;cursor:pointer}
.hero-toolbar button:hover{background:#edf3f8}
.hero-static-link{display:inline-block;overflow:visible;cursor:zoom-in;font-size:12px;text-decoration:underline;text-underline-offset:3px}
.hero-motion-note{color:var(--muted);margin-left:auto;font-size:11px}
.hero-animated figcaption{padding:0 12px;margin-top:17px}
@media(max-width:1100px){
 .article-shell{display:block;padding-top:35px}
 .article-sidebar{position:static;max-width:var(--wide);margin:0 auto 35px}
 .article-sidebar .article-toc{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:2px 12px;border:1px solid var(--line);border-radius:7px;padding:15px;max-height:none;font-size:11px}
 .article-sidebar .article-toc span{grid-column:1/-1;padding:0 9px 5px}
 .article-sidebar .article-toc .toc-paper{border:0;margin:0;padding:7px 9px}
 .hero-motion-note{margin-left:0}
}
@media(max-width:700px){
 .article-shell{padding:25px 20px 65px}
 .article-sidebar .article-toc{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 8px;padding:11px}
 .article-sidebar .article-toc a{padding:5px 7px}
 .research-figure.hero-animated{padding:7px 7px 15px}
 .hero-toolbar{padding:12px 7px 0;gap:10px 15px}
 .hero-motion-note{flex-basis:100%}
 .hero-animated figcaption{padding:0 7px}
}
@media print{
 .article-shell{display:block;max-width:none;padding:20px 0}
 .article-sidebar,.hero-toolbar{display:none!important}
 .hero-animated{break-inside:avoid}
}

/* Question-led reading layout; left navigation remains persistent on desktop. */
.article-shell article>p,.article-shell article>ul,.article-shell article>ol{max-width:740px}
.article-shell article>p{margin-top:23px;margin-bottom:23px}
.article-shell article>h2{margin-top:80px;padding-top:22px}
.article-shell .standfirst{font-size:22px;line-height:1.55}
.article-shell .research-figure figcaption{font-size:14px;line-height:1.75}
.article-shell .research-figure.hero-results{background:#fff;border:0;border-radius:0;padding:10px 0 18px}
.article-shell .takeaway{background:transparent}
.toc-disclosure>summary{display:none}
.schedule-path{max-width:940px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:20px 0;margin:30px auto;font-size:15px;line-height:1.65;counter-reset:stage}
.schedule-path p{margin:0;counter-increment:stage}
.schedule-path p:before{content:'0' counter(stage);display:block;font-size:12px;letter-spacing:.1em;color:var(--accent);margin-bottom:9px}
.schedule-path strong{color:var(--accent)}
@media(min-width:1101px){.toc-disclosure:not([open])>.article-toc{display:flex}}
@media(max-width:1100px){.toc-disclosure>summary{display:list-item;cursor:pointer;font-size:14px;color:var(--accent);padding:8px 0}.article-sidebar .article-toc{margin-top:8px}}
@media(max-width:700px){.schedule-path{grid-template-columns:1fr;gap:20px}.article-shell article>h2{margin-top:55px}.article-shell .standfirst{font-size:19px}}

.toc-disclosure:not([open])>summary{display:list-item;cursor:pointer;color:var(--accent)}

/* Chinese reading typography */
html[lang="zh-CN"] body {font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif; line-height:1.9;}
html[lang="zh-CN"] h1,html[lang="zh-CN"] h2,html[lang="zh-CN"] h3 {letter-spacing:0;line-height:1.45;}
html[lang="zh-CN"] .article-toc {line-height:1.65;}