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@media(max-width:1100px){.shell{width:calc(100% - 60px)}.header-inner{gap:20px}.site-header nav{gap:17px;font-size:12px}.brand>span{font-size:22px}.brand img{width:40px;height:40px}.hero-grid{gap:40px}.hero h1{font-size:46px}.math-board{min-height:470px;padding:25px}.geometry{height:330px}.hero-actions{gap:18px}.hero-actions .subtle-link{font-size:12px}.hero-actions .button{padding:12px 18px;gap:14px}.method-grid{gap:60px}.team-copy{padding:35px}.team-copy h2{font-size:28px}.footer-brand span{display:block;margin:5px 0}.detail-grid{gap:40px;grid-template-columns:minmax(0,1fr) 210px}.teacher{gap:40px}.teacher-info{padding-right:30px}}
@media(max-width:820px){.header-inner{height:80px}.menu-toggle{display:flex;background:none;border:0;gap:13px;font-size:13px}.site-header nav{display:none;position:absolute;top:80px;left:0;right:0;background:var(--paper);padding:15px 30px 25px;border-bottom:1px solid var(--line);font-size:15px}.site-header nav.open{display:flex;flex-direction:column;align-items:stretch;gap:0}.site-header nav a{padding:12px 0}.site-header nav .nav-contact{padding:12px;margin-top:10px}.hero-grid{grid-template-columns:1fr;gap:45px}.hero{padding:40px 0 60px}.hero h1{font-size:53px}.hero-description br:last-of-type{display:none}.hero-description{max-width:500px}.math-board{max-width:530px;width:100%;margin:0 auto;min-height:470px}.hero-copy{max-width:620px}.principles-inner{flex-wrap:wrap;justify-content:flex-start;gap:12px 25px;padding:20px 0}.principles p{width:100%}.principles span:before{margin-right:8px}.section{padding-top:60px;padding-bottom:60px}.section-heading h2{font-size:28px}.section-heading>p{display:none}.pathway{padding:24px}.pathway h3{font-size:23px}.pathway-bottom{align-items:flex-end;gap:10px}.method-grid{gap:40px;grid-template-columns:1fr}.method-grid h2{font-size:32px}.method-grid h2 br{display:none}.method-list li{padding:22px 0}.article-grid{grid-template-columns:repeat(2,1fr);gap:30px 22px}.article-art{height:220px}.team-teaser{grid-template-columns:1fr 1.2fr;margin-bottom:60px}.team-copy{padding:25px}.team-copy h2{font-size:26px}.team-portrait{height:auto;min-height:420px}.leader-sign{display:block}.leader-sign span{display:block}.cta-section h2{font-size:27px}.cta-section{gap:30px}.footer-top{gap:20px;grid-template-columns:1.5fr 1fr 1fr}.detail-grid{display:flex;flex-direction:column-reverse;gap:30px}.detail-aside .aside-box{position:static}.aside-box{padding:20px;background:#e8ece3;border:0}.aside-box .eyebrow{margin-bottom:10px}#article-toc{display:flex;gap:5px 20px;flex-wrap:wrap}#article-toc a{margin:4px 0}.aside-contact{margin-top:12px;padding-top:12px}.detail-aside .button{width:auto}.teacher{grid-template-columns:250px 1fr;gap:27px}.teacher-info{padding:20px 22px 20px 0}.teacher-bio{font-size:14px}.teacher-image{height:400px}.contact-grid{gap:35px}.journal-controls{align-items:flex-start;flex-direction:column;gap:15px}.consent{flex-direction:column;align-items:stretch;gap:15px}.consent-actions{justify-content:flex-end}}
@media(max-width:560px){.shell{width:calc(100% - 40px)}.trial{padding:0 20px;font-size:9px}.trial span:last-child{display:none}.brand>span{font-size:21px}.brand img{width:38px;height:38px}.brand small{font-size:7px}.brand{gap:9px}.header-inner{height:72px}.site-header nav{top:72px}.hero{padding:33px 0 45px}.hero .eyebrow{font-size:10px;margin-bottom:20px;letter-spacing:.07em}.hero h1{font-size:40px;margin-bottom:25px}.hero-description{font-size:14px;line-height:2}.hero-description br{display:none}.hero-actions{gap:19px;flex-wrap:wrap}.hero-actions .button{font-size:13px;padding:12px 17px}.hero-actions .subtle-link{font-size:12px}.hero-note{margin-top:24px;font-size:11px}.hero-grid{gap:35px}.math-board{min-height:360px;padding:18px;box-shadow:6px 7px 0 #e4e7dd;transform:rotate(.8deg);width:calc(100% - 6px)}.board-top{font-size:7px;padding-bottom:12px}.board-label{top:58px;left:21px;font-size:19px}.geometry{height:280px;margin-top:15px}.board-bottom{font-size:11px}.paper-note{font-size:12px;left:-9px;bottom:50px;padding:12px 37px 12px 15px}.principles-inner{font-size:11px;gap:8px 17px}.principles p{font-size:12px}.principles span:before{margin-right:7px}.section{padding:48px 0}.section-heading{display:block;margin-bottom:26px}.section-heading h2{font-size:27px}.section-heading>a{display:inline-block;margin-top:15px;font-size:12px}.eyebrow{font-size:9px;letter-spacing:.12em;margin-bottom:13px}.pathways{grid-template-columns:1fr;gap:16px}.pathway{padding:23px}.pathway-number{font-size:24px;padding-bottom:13px}.pathway h3{font-size:23px;margin-top:18px}.pathway p{font-size:13px;margin-bottom:23px}.pathway-bottom{font-size:11px}.method-section{padding:45px 0}.method-grid h2{font-size:28px}.method-grid{gap:30px}.method-grid .muted{font-size:14px}.method-list li{gap:19px;padding:19px 0}.method-list h3{font-size:18px}.method-list p{font-size:13px}.article-grid{grid-template-columns:1fr;gap:35px}.article-art{height:220px}.article-card h3{font-size:21px}.article-meta{margin:15px 0 10px}.article-card p{margin-bottom:12px}.read-link{margin-top:16px}.team-teaser{grid-template-columns:1fr;margin-bottom:45px}.team-portrait{height:340px;min-height:0}.team-portrait img{object-position:50% 22%}.team-copy{padding:28px}.team-copy h2{font-size:28px}.leader-sign{margin:20px 0}.team-copy>p:not(.eyebrow){font-size:13px}.cta-section{display:block;padding:35px 0 45px}.cta-section .button{margin-top:25px}.cta-section h2{font-size:27px}.cta-section p:last-child{font-size:13px}.site-footer{padding-top:35px}.footer-top{grid-template-columns:1fr 1fr;gap:30px}.footer-top>div:first-child{grid-column:1/-1}.footer-brand span{display:inline;margin-left:15px;font-size:11px}.footer-brand{font-size:25px}.footer-top p{margin:13px 0 0}.footer-bottom{font-size:10px;gap:12px;flex-wrap:wrap}.page-intro{padding:35px 0 25px;margin-bottom:20px}.page-intro h1{font-size:32px;line-height:1.6;margin-bottom:17px}.page-intro>p:not(.eyebrow){font-size:14px}.tabs{gap:20px;font-size:13px}.course-grid{grid-template-columns:1fr}.course-card,.empty-panel{padding:25px}.course-card h3{font-size:23px}.empty-panel p{font-size:14px}.quiet-note{font-size:13px}.course-strip{grid-template-columns:1fr}.article-intro{padding:30px 0}.article-intro h1{font-size:29px;line-height:1.5}.breadcrumb{font-size:11px;margin-bottom:23px}.article-standfirst{font-size:15px}.article-byline{gap:10px 20px;font-size:11px}.detail-grid{padding-top:25px;padding-bottom:50px}.prose{font-size:15px;line-height:2}.prose h2{font-size:23px;margin:30px 0 15px}.prose h3{font-size:19px}.prose th,.prose td{padding:8px 10px}.teacher{grid-template-columns:1fr;gap:0}.teacher-image{height:380px}.teacher-info{padding:28px}.teacher-info h2{font-size:29px}.manifesto{text-align:left;padding-bottom:50px}.manifesto h2{font-size:27px}.manifesto p:last-child{font-size:15px}.tool-grid{grid-template-columns:1fr;gap:20px}.tool-card{padding:27px}.spaced{margin-top:40px}.contact-grid{grid-template-columns:1fr;gap:25px;padding:0 0 50px}.contact-panel{padding:28px}.contact-notes h3{font-size:20px}.consent{left:12px;right:12px;bottom:12px;padding:20px}.consent strong{font-size:15px}.consent p{font-size:12px}.consent .button{font-size:12px}.prose.narrow{padding-bottom:50px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
.katex-display{overflow-x:auto;overflow-y:hidden;padding:8px 0}.prose .katex{font-size:1.1em}

/* Official transparent brand artwork, preserving the supplied aspect ratio. */
.brand img.brand-logo{width:224px;height:auto;display:block}
@media(max-width:1000px){.brand img.brand-logo{width:198px}}
@media(max-width:600px){.brand img.brand-logo{width:180px}}

/* Preserve headroom with the supplied high-resolution portrait. */
.team-portrait img,.teacher-image img{object-position:50% 18%}

.teacher-card-portrait{display:block;width:100%;height:100%;background:#edf0ec}

/* Contact QR: display the supplied poster's exact QR region without changing its pixels. */
#wechat-qr{margin-top:28px;padding-top:22px;border-top:1px solid var(--line)}
#wechat-qr summary{font-weight:600;font-size:14px;cursor:pointer;margin-bottom:18px}
.contact-qr-wrap{width:min(280px,100%);aspect-ratio:1;background:#fff;border:1px solid var(--line);margin:0;overflow:hidden;position:relative}
.contact-qr-wrap img{width:100%;height:auto;max-width:100%}
.contact-qr-poster img{position:absolute;width:156.09756098%;max-width:none;height:auto;left:-27.80487805%;top:-152.68292683%;margin:0}
.contact-panel .contact-qr-help{font-size:12px;line-height:1.9;color:var(--muted);max-width:310px;margin:14px 0 8px}
.contact-qr-save{display:inline-block;font-size:12px;text-decoration:underline;text-underline-offset:4px}
.contact-panel .copy-status{min-height:1.8em;margin:9px 0 0;font-size:12px;color:var(--muted)}
@media(max-width:560px){.contact-qr-wrap{width:min(260px,100%)}#wechat-qr{margin-top:18px}}

.course-guidance{padding:12px 0 48px;border-bottom:1px solid var(--line)}
.guidance-lead{max-width:750px;color:var(--muted)}
.guidance-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin:30px 0}
.guidance-steps article{padding:28px;background:#e8ece3}
.guidance-steps span{font-size:12px;color:var(--muted)}
.guidance-steps h3{font-size:21px;margin:14px 0 12px}
.guidance-steps p{font-size:14px;margin:0}
.guidance-principles{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin:30px 0}
.guidance-principles h3{font-size:20px}.guidance-principles p{font-size:14px;color:var(--muted)}
.guidance-action{display:flex;align-items:center;gap:22px;flex-wrap:wrap}.guidance-action span{font-size:13px;color:var(--muted)}
.course-assessment-note{font-size:12px;line-height:1.9;color:var(--muted)}
.selected-course{padding:22px;background:#e8ece3;margin-bottom:28px}.selected-course h3{font-size:21px;margin-bottom:10px}.selected-course a{font-size:13px}.selected-course>p:last-child{font-size:12px;color:var(--muted);margin:12px 0 0}
.inquiry-copy{margin:26px 0 32px;padding:22px;border:1px solid var(--line)}.inquiry-copy h3{font-size:18px}.inquiry-copy #inquiry-text{white-space:pre-line;font-size:14px;line-height:2}.inquiry-copy .copy-status{font-size:12px;color:var(--muted);margin:12px 0 0}
@media(max-width:820px){.guidance-steps{grid-template-columns:1fr;gap:15px}.guidance-principles{grid-template-columns:1fr;gap:12px}}
@media(max-width:560px){.course-guidance{padding-bottom:35px}.guidance-steps article{padding:22px}.guidance-principles h3{font-size:19px}.selected-course,.inquiry-copy{padding:20px}.contact-notes>h3{margin-top:25px}}