/* Class AI · offline user guide */
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@media(min-width:1700px){main{padding-left:50px;padding-right:50px;max-width:calc(var(--content) + 100px)}}
@media(max-width:1200px){:root{--sidebar:230px}main{padding:0 32px}.topbar{padding:0 27px}.hero{padding-top:44px}.hero-grid{gap:22px}.hero h1{font-size:36px}.hero .lead{font-size:13px}.hero-art{padding:8px}.feature-grid{column-gap:17px}.feature{gap:9px}.steps.horizontal.four{grid-template-columns:repeat(2,minmax(0,1fr))}.compact-layout{gap:22px}.compact-layout .steps p{font-size:11px}.chapter-heading h2{font-size:27px}.search{width:230px}.top-context .offline-tag{display:none}.gif-caption{align-items:start}.gif-controls{gap:0}}
@media(max-width:900px){:root{--sidebar:248px;--header:62px}.sidebar{top:var(--header);transform:translateX(-101%);transition:transform .18s ease;width:var(--sidebar);z-index:35}.sidebar .brand{display:none}.side-nav{padding-top:18px}.workspace{margin-left:0}.topbar{padding:0 20px;gap:11px}.menu-button{display:flex;flex:none}.mobile-brand{display:block;font-size:16px;white-space:nowrap}.top-context{display:none}.search{margin-left:auto;width:235px}.search-results{right:0}.nav-open .sidebar{transform:translateX(0)}.nav-open .nav-scrim{display:block;position:fixed;inset:var(--header) 0 0;background:#14233b55;border:0;z-index:32}.nav-open{overflow:hidden}main{padding:0 34px;max-width:900px}.hero h1{font-size:37px}.hero .lead{font-size:14px}.hero-art{transform:none}.feature-grid{column-gap:25px}.topic{scroll-margin-top:82px}.chapter{scroll-margin-top:82px}.footer{padding-bottom:65px}.back-top{right:18px;bottom:18px}}
@media(max-width:600px){body{font-size:14px}.topbar{padding:0 14px}.mobile-brand{font-size:15px}.menu-button{width:35px;height:35px}.search{width:auto;min-width:0;flex:1;margin-left:8px;max-width:200px}.search-wrap{padding:7px 8px}.search input{font-size:11px}.search kbd{display:none}.search-results{width:min(320px,calc(100vw - 28px));top:43px}.skip-link{left:12px}main{padding:0 21px}.hero{padding:31px 0 30px}.hero-grid{grid-template-columns:1fr;gap:25px}.eyebrow{font-size:9px;margin-bottom:13px}.hero h1{font-size:34px;letter-spacing:-1px}.hero .lead{font-size:13px;line-height:1.9;margin:16px 0 20px;max-width:none}.button{font-size:11px;padding:10px 13px;min-height:42px}.hero-meta{margin-top:18px;font-size:9px;gap:6px}.hero-meta span+span:before{margin-right:6px}.hero-art{border-radius:12px;padding:8px 8px 11px}.hero-art .art-note{font-size:9px;padding-top:10px}.feature-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:0 18px;margin-top:27px}.feature{padding:16px 0;gap:9px}.feature:nth-child(-n+4){border-bottom:1px solid var(--line)}.feature>svg{width:16px;height:16px}.feature h4{font-size:12px}.feature p{font-size:10px}.demo-context{font-size:9px;line-height:1.9}.chapter{padding-top:32px}.chapter-heading{gap:11px;margin-bottom:21px}.chapter-heading h2{font-size:25px}.chapter-heading p{font-size:12px}.chapter-index{min-width:27px;height:27px;font-size:10px}.chapter-label{font-size:9px}.topic{padding:27px 0 32px}.topic-head{gap:8px;margin-bottom:14px}.topic-head .topic-number{font-size:10px;min-width:23px}h3{font-size:21px}.topic-intro{font-size:12px;line-height:1.9}.topic-meta{font-size:9px}.compact-layout{grid-template-columns:1fr;gap:5px}.compact-layout .steps p{font-size:12px}.steps{gap:15px;margin:17px 0}.steps.horizontal,.steps.horizontal.four{grid-template-columns:1fr;gap:14px}.steps strong{font-size:12px}.steps p{font-size:12px}.steps .step-number{width:22px;height:22px;line-height:20px}.quick-route{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:19px 20px}.quick-route li{padding:0}.quick-route li:not(:last-child):after{display:none}.quick-route li:last-child{grid-column:1/-1}.quick-route .step-number{float:left;margin:0 9px 0 0;width:27px;height:27px;font-size:11px}.quick-route b{font-size:12px}.quick-route p{margin-left:36px;font-size:11px}.figure{border-radius:10px;margin-top:16px}.figure-top{height:27px;font-size:8px;padding:0 10px}.figure figcaption{font-size:9px;padding:9px 11px}.zoom-hint{opacity:1;font-size:8px;padding:3px 5px;right:6px;bottom:6px}.zoom-hint svg{width:10px;height:10px}.inline-note{font-size:11px;line-height:1.9;margin-top:15px}.lesson-links{font-size:10px;gap:8px 13px}.number-legend{font-size:10px;gap:9px 12px;line-height:1.6}.mini-grid{grid-template-columns:1fr;gap:12px}.mini-grid>div{padding:14px 16px}.gif-player{border-radius:10px;margin-top:18px}.gif-head{padding:10px 11px;gap:6px}.gif-title{font-size:10px;gap:6px}.gif-title svg{width:13px;height:13px}.gif-length{font-size:9px}.gif-fixture{display:none}.play-pill{font-size:11px;padding:10px 15px;gap:6px}.play-pill svg{width:16px;height:16px}.gif-caption{padding:10px 11px;gap:8px;flex-wrap:wrap;font-size:9px}.gif-caption p{width:100%}.gif-controls{margin-left:auto}.text-button{font-size:10px;padding:7px 8px}.player-location{font-size:10px;padding:11px 12px;gap:12px}.player-location>span{display:none}.data-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 18px}.data-item b{font-size:11px}.data-item p{font-size:10px}.faq-item summary{font-size:12px;padding:17px 2px;line-height:1.8}.faq-item>div{font-size:12px;padding-right:5px}.reminders{grid-template-columns:1fr;gap:20px}.reminder h4{font-size:12px}.reminder p{font-size:11px}.help-box{padding:17px 16px}.help-box p{font-size:11px}.footer{flex-direction:column;gap:9px;font-size:9px;padding-top:23px;margin-top:25px}.lightbox{width:calc(100vw - 18px);max-height:calc(100dvh - 20px);border-radius:9px}.lightbox-head{padding:10px;gap:8px}.lightbox-title{font-size:10px;max-width:150px}.lightbox-actions{gap:5px}.lightbox-actions button{font-size:10px;padding:7px 8px;min-height:38px}.lightbox-stage{padding:5px}.lightbox-hint{font-size:9px}.back-top{width:36px;height:36px;right:13px;bottom:13px}}
/* One offset belongs to the root; duplicate anchor offsets misidentify sections. */
.chapter,.topic{scroll-margin-top:0}.topic-intro{font-size:15px}.steps strong{font-size:14px}.steps p,.compact-layout .steps p{font-size:14px}.chapter-heading p{font-size:14px}.inline-note{font-size:13px}.mini-grid p{font-size:13px}.data-item p{font-size:12px}.faq-item>div{font-size:14px}.figure figcaption{font-size:11px}
@media(max-width:600px){.topic-intro{font-size:13px}.steps strong{font-size:13px}.steps p,.compact-layout .steps p{font-size:13px}.chapter-heading p{font-size:12px}.inline-note{font-size:12px}.mini-grid p{font-size:12px}.data-item p{font-size:11px}.faq-item summary{font-size:13px}.faq-item>div{font-size:13px}.figure figcaption{font-size:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}.hero-art{transform:none}}
@media print{.sidebar,.topbar,.back-top,.gif-controls,.gif-start{display:none!important}.workspace{margin:0}main{max-width:none;padding:0}.topic{break-inside:avoid}.hero{padding-top:10px}.lightbox{display:none}.footer{padding-bottom:0}}

/* PHASE 3.5: readable GIF viewing and mobile support text; brand/layout retained. */
.platform-entry{margin-top:18px;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--canvas);max-width:430px}.platform-entry>div{display:flex;align-items:center;gap:10px}.platform-entry strong{font-size:13px}.platform-entry span{font-size:11px;color:var(--muted)}.platform-entry p{font-size:12px;color:var(--muted);line-height:1.8;margin-top:6px}.gif-controls [data-gif-zoom]{font-weight:650}.lightbox.is-gif[open]{display:flex;flex-direction:column;max-height:calc(100dvh - 20px)}.lightbox.is-gif .lightbox-stage{flex:1;min-height:0;max-height:calc(100dvh - 150px);overscroll-behavior:contain}.lightbox.is-gif .lightbox-hint{font-size:12px;line-height:1.8;padding:8px 14px 10px}.lightbox.is-gif .lightbox-actions button{font-size:12px;min-height:40px}.lightbox.is-gif .lightbox-title{font-size:13px}.lightbox-stage.native-size{touch-action:pan-x pan-y pinch-zoom}
@media(max-width:600px){.platform-entry{padding:11px 12px}.platform-entry p{font-size:12px}.figure figcaption,.hero-art .figure figcaption{font-size:12px;line-height:1.85}.gif-caption,.gif-caption .status{font-size:12px;line-height:1.85}.gif-title{font-size:12px}.gif-length{font-size:11px}.gif-fixture{display:inline-flex;font-size:11px;line-height:1.7;flex-wrap:wrap}.gif-controls{width:100%;justify-content:flex-end;flex-wrap:wrap;gap:3px;margin-left:0}.gif-controls .text-button{font-size:12px;min-height:40px;padding:7px 8px}.demo-context,.hero-meta,.hero-art .art-note{font-size:11px}.zoom-hint{font-size:11px}.quick-route p{font-size:12px}.lightbox.is-gif .lightbox-head{flex-wrap:wrap;gap:8px}.lightbox.is-gif .lightbox-title{flex-basis:100%;max-width:none}.lightbox.is-gif .lightbox-actions{width:100%;flex-wrap:wrap;justify-content:flex-end;gap:5px}.lightbox.is-gif .lightbox-actions button{min-height:40px;padding:6px 9px}.lightbox.is-gif .lightbox-stage{max-height:calc(100dvh - 190px)}.lightbox.is-gif .lightbox-hint{font-size:12px;line-height:1.8}}