:root{--paper:#fafbf9;--surface:#fff;--soft:#f1f5f1;--ink:#242d2a;--muted:#77817c;--line:#e0e5df;--green:#237a57;--green-dark:#175b40;--green-tint:#e7f1e8;--orange:#d39453;--sidebar:220px;--radius:12px;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}a{color:inherit;text-decoration:none}button,input,select{color:inherit}button{border:0;background:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #78b695;outline-offset:4px}img{display:block}button img{pointer-events:none}h1,h2,h3,p{margin:0}button:active{transform:translateY(1px)}[hidden]{display:none!important}.skip-link{position:fixed;z-index:100;left:24px;top:-80px;background:var(--ink);color:#fff;padding:12px}.skip-link:focus{top:12px}.app-shell{min-height:100dvh;display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr)}.sidebar{position:sticky;top:0;height:100dvh;border-right:1px solid var(--line);background:var(--paper);padding:28px 18px 22px;display:flex;flex-direction:column;z-index:30}.brand{display:flex;gap:10px;align-items:center;padding:0 8px 27px;min-height:78px}.brand-emblem{width:42px;height:42px;object-fit:contain;flex-shrink:0}.brand-copy{display:flex;flex-direction:column;gap:7px;white-space:nowrap}.brand-copy strong{font-size:17px;letter-spacing:.01em;font-weight:650}.brand-copy>span{font-size:12px;letter-spacing:.14em;color:var(--muted)}.primary-nav{border-top:1px solid var(--line);padding:20px 0}.nav-item{display:flex;gap:12px;align-items:center;min-height:46px;border-radius:8px;padding:10px 12px;font-size:15px;font-weight:500}.nav-item img{width:21px;height:21px;opacity:.8}.nav-item.is-current{color:var(--green);background:var(--green-tint)}.nav-count{font-size:12px;color:var(--muted);margin-left:auto}.nav-section{border-top:1px solid var(--line);padding:22px 0 14px}.nav-section h2{font-size:12px;color:var(--muted);font-weight:500;margin:0 12px 12px;letter-spacing:.1em}.nav-options{display:flex;flex-direction:column;gap:5px}.filter-button{width:100%;min-height:41px;padding:10px 16px;text-align:left;border-radius:8px;font-size:14px;display:flex;justify-content:space-between;align-items:center}.filter-button:hover{background:#edf2eb}.filter-button[aria-pressed=true]{color:var(--green);font-weight:600;background:var(--green-tint)}.filter-count{font-size:11px;color:var(--muted);font-weight:400}.sidebar-bottom{margin-top:auto;padding:20px 12px 0;display:flex;gap:7px;align-items:center;font-size:11px;color:var(--muted)}.sidebar-dot{height:5px;width:5px;border-radius:50%;background:var(--green)}main{padding:32px 38px 50px;min-width:0;outline:none}.breadcrumb{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted);margin-bottom:28px;min-height:20px}.breadcrumb a:hover{color:var(--green)}.breadcrumb img{width:11px;height:11px;opacity:.5}.page-top{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;padding-bottom:24px;border-bottom:1px solid var(--line);margin-bottom:28px}.page-top h1{font-size:30px;line-height:1.35;letter-spacing:-.04em;font-weight:650}.page-top p{font-size:14px;color:var(--muted);margin-top:10px;line-height:1.7}.page-top .lesson-question{color:#505d55;font-size:15px}.search-box{width:260px;max-width:40%;border-bottom:1px solid #cbd5cc;padding:9px 0;display:flex;align-items:center;gap:9px;margin-top:3px}.search-box img{width:18px;height:18px;opacity:.65}.search-box input{width:100%;min-width:0;border:0;outline:none;background:none;font-size:13px}.search-box input:focus-visible{outline:0}.search-box:focus-within{border-color:var(--green)}.catalog-toolbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px;gap:12px;color:var(--muted);font-size:12px}.catalog-toolbar select{border:0;background:transparent;font-size:12px;max-width:140px;padding:5px}.catalog-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px 22px}.lesson-card{min-width:0;position:relative}.lesson-open{display:block;width:100%;text-align:left}.lesson-thumbnail{position:relative;overflow:hidden;border-radius:9px;background:#eef3ec;aspect-ratio:1.65}.lesson-thumbnail canvas{width:100%;height:100%;object-fit:contain;display:block;transition:transform .25s}.lesson-open:hover canvas{transform:scale(1.035)}.thumb-tag{position:absolute;left:12px;top:12px;font-size:10px;letter-spacing:.04em;padding:4px 6px;color:#4d6957;background:rgba(255,255,255,.8);border-radius:3px}.lesson-meta{display:flex;align-items:center;gap:8px;margin-top:15px;color:var(--muted);font-size:11px}.lesson-meta span+span:before{content:'·';margin-right:8px;color:#a6afa7}.lesson-card h2{font-size:16px;font-weight:600;margin-top:7px;line-height:1.5;padding-right:25px}.lesson-card p{font-size:12px;line-height:1.8;color:var(--muted);margin-top:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:43px}.card-footer{display:flex;align-items:center;justify-content:space-between;margin-top:13px;border-top:1px solid var(--line);padding-top:10px}.text-link{color:var(--green);font-size:12px;display:flex;align-items:center;gap:6px}.text-link img{width:14px;height:14px}.star-button{padding:7px;border-radius:5px}.star-button img{width:17px;height:17px;opacity:.45}.star-button[aria-pressed=true]{background:var(--green-tint)}.star-button[aria-pressed=true] img{opacity:1;filter:invert(33%) sepia(19%) saturate(1365%) hue-rotate(103deg)}.empty-state{grid-column:1/-1;padding:100px 20px;text-align:center;color:var(--muted)}.empty-state h2{font-size:19px;color:var(--ink);margin-bottom:14px}.empty-state button{color:var(--green);margin-top:24px}.player-grid{display:grid;grid-template-columns:minmax(0,1fr) 254px;gap:24px;align-items:stretch}.workspace-column{min-width:0}.experiment-stage{position:relative;overflow:hidden;border-radius:10px;background:#eff1ed;aspect-ratio:900/650;min-height:370px;isolation:isolate}.experiment-stage>canvas{display:block;width:100%;height:100%;object-fit:contain}.experiment-stage canvas{touch-action:none}.scene-label{position:absolute;pointer-events:none;z-index:2;background:rgba(255,255,255,.86);padding:5px 8px;border-radius:3px;font-size:12px;color:#35473c;white-space:nowrap;box-shadow:0 1px 4px #243e2d0c}.scene-label.metric{background:transparent;box-shadow:none;color:#3a5f48;font-style:italic}.scene-error{position:absolute;inset:0;display:grid;place-content:center;text-align:center;padding:35px;line-height:1.8;font-size:14px;color:#58685f;background:#edf2ea}.scene-hint{position:absolute;left:18px;bottom:14px;font-size:10px;color:#7b897e;pointer-events:none;z-index:3}.scene-view-row{display:flex;justify-content:center;align-items:center;gap:8px;min-height:56px;padding-top:12px}.segment-control{display:inline-flex;border:1px solid #d7dfd6;border-radius:7px;padding:3px;gap:3px}.segment-control button{min-width:69px;padding:7px 11px;border-radius:4px;font-size:12px}.segment-control button[aria-pressed=true]{background:var(--green);color:#fff}.view-button-inner{display:flex;align-items:center;justify-content:center;gap:6px}.view-button-inner img{width:14px;height:14px}.segment-control button[aria-pressed=true] img{filter:brightness(0) invert(1)}.principle{display:flex;align-items:flex-start;gap:13px;border-top:1px solid var(--line);padding-top:19px;margin-top:16px;font-size:14px;line-height:1.8}.principle:before{content:'';width:4px;height:20px;flex-shrink:0;border-radius:2px;background:var(--green);margin-top:2px}.inspector{border-left:1px solid var(--line);padding-left:24px;display:flex;flex-direction:column;min-width:0}.inspector h2{font-size:16px;font-weight:600;line-height:1.5;margin-bottom:28px}.control-group{margin-bottom:27px}.control-heading{display:flex;align-items:center;justify-content:space-between;gap:7px;font-size:13px;margin-bottom:12px}.control-number{display:flex;align-items:baseline;gap:4px;white-space:nowrap}.control-number input{width:72px;text-align:right;border:0;background:transparent;font-size:16px;font-variant-numeric:tabular-nums;padding:2px 0;border-radius:2px;appearance:textfield;-moz-appearance:textfield}.control-number input::-webkit-inner-spin-button{appearance:none}.unit{font-size:11px;color:var(--muted)}input[type=range]{width:100%;height:18px;accent-color:var(--green);margin:0;cursor:pointer}.control-bounds{display:flex;justify-content:space-between;font-size:9px;color:#98a098;margin-top:3px}.toggles{border-top:1px solid var(--line);padding-top:16px;display:flex;flex-direction:column;gap:16px;margin:1px 0 20px}.toggle-row{display:flex;justify-content:space-between;align-items:center;font-size:13px}.switch{position:relative;width:35px;height:21px;border-radius:20px;background:#cbd5cb;transition:background .2s;flex-shrink:0}.switch:after{content:'';height:15px;width:15px;border-radius:50%;background:#fff;position:absolute;top:3px;left:3px;box-shadow:0 1px 3px #0002;transition:transform .2s}.switch[aria-checked=true]{background:var(--green)}.switch[aria-checked=true]:after{transform:translateX(14px)}.metrics{padding:19px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:18px;margin-bottom:20px}.metric-row{display:flex;justify-content:space-between;align-items:baseline;gap:6px;font-size:12px;line-height:1.6}.metric-value{font-size:17px;font-weight:500;font-variant-numeric:tabular-nums;text-align:right}.metric-value small{font-size:10px;color:var(--muted);font-weight:400;margin-left:4px}.player-actions{margin-top:auto;display:grid;grid-template-columns:1fr 1fr;gap:9px;padding-top:6px}.button-primary{background:var(--green);color:#fff;min-height:44px;border-radius:7px;font-size:13px;display:flex;justify-content:center;align-items:center;gap:8px;transition:background .15s}.button-primary:hover{background:var(--green-dark)}.button-primary img{width:16px;height:16px;filter:brightness(0) invert(1)}.player-actions>.button-primary{grid-column:1/-1}.button-outline{border:1px solid #d4ddd2;border-radius:6px;min-height:39px;font-size:12px;display:flex;align-items:center;justify-content:center;gap:7px}.button-outline:hover{background:#f0f4ed}.button-outline img{width:15px;height:15px}.record-button{grid-column:1/-1;color:var(--muted);font-size:11px;padding:9px}.record-button:hover{color:var(--green)}.model-details{font-size:11px;line-height:1.8;color:var(--muted);border-top:1px solid var(--line);margin-top:16px;padding-top:14px}.model-details summary{cursor:pointer}.model-details p{margin-top:9px}.lesson-bottom{margin-top:28px;display:grid;grid-template-columns:1fr 1fr;gap:30px}.formula-block{font-size:13px;line-height:1.8}.formula-label{color:var(--muted);font-size:10px;margin-bottom:7px;letter-spacing:.08em}.lesson-previous-next{display:flex;justify-content:space-between;border-top:1px solid var(--line);margin-top:32px;padding-top:20px;gap:20px}.lesson-previous-next button{display:flex;gap:7px;align-items:center;color:var(--muted);font-size:11px;max-width:50%;text-align:left}.lesson-previous-next img{width:13px;height:13px}.player-heading-actions{display:flex;gap:7px}.icon-button{border:1px solid transparent;border-radius:7px;padding:9px;display:inline-flex;align-items:center;justify-content:center}.icon-button img{width:19px;height:19px}.icon-button:hover{background:var(--green-tint)}.icon-button[aria-pressed=true]{background:var(--green-tint)}.icon-button[aria-pressed=true] img{filter:invert(33%) sepia(19%) saturate(1365%) hue-rotate(103deg)}.toast{position:fixed;bottom:25px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:#263d30;color:#fff;z-index:200;padding:11px 20px;border-radius:7px;font-size:12px;transition:opacity .18s,transform .18s;box-shadow:0 5px 25px #18332620}.toast.is-visible{transform:translate(-50%,0);opacity:1}.mobile-bar{display:none}.fullscreen-stage{background:var(--paper);padding:24px;overflow:auto}.fullscreen-stage:fullscreen{display:grid;place-content:center}.fullscreen-stage:fullscreen .experiment-stage{width:min(90vw,1350px);height:min(76vh,850px);aspect-ratio:auto}.fullscreen-fallback{position:fixed!important;inset:0;z-index:120;overflow:auto;background:var(--paper);padding:24px}.fullscreen-fallback .experiment-stage{height:76vh;aspect-ratio:auto}.exit-fullscreen{display:none}.fullscreen-fallback .exit-fullscreen,:fullscreen .exit-fullscreen{display:inline-flex;position:absolute;top:26px;right:28px;z-index:10;background:var(--surface);border:1px solid var(--line)}.print-title{display:none}
.fullscreen-stage{padding:0}.fullscreen-stage:fullscreen,.fullscreen-fallback{padding:24px}.player-grid{max-width:1450px}.page-top{max-width:1450px}.scene-label.metric{font-size:11px}
@media(min-width:1191px){.page-top h1{font-size:40px;letter-spacing:-.035em}.page-top .lesson-question{font-size:17px}.page-top{padding-bottom:28px;margin-bottom:32px}.breadcrumb{margin-bottom:36px}.nav-item{font-size:17px}.nav-section h2{font-size:14px}.filter-button{font-size:16px;min-height:43px}.control-heading{font-size:14px}.control-number input{font-size:18px}.inspector h2{font-size:18px}.metric-row{font-size:14px}.metric-value{font-size:19px}.button-primary{font-size:15px;min-height:48px}.button-outline{font-size:13px;min-height:43px}.principle{font-size:16px}}
@media(min-width:1550px){:root{--sidebar:235px}main{padding:38px 48px 60px}.player-grid{grid-template-columns:minmax(0,1fr) 280px;gap:28px}.inspector{padding-left:28px}.experiment-stage{aspect-ratio:900/640;max-height:760px}.catalog-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media(max-width:1190px){:root{--sidebar:190px}.brand{padding-left:3px;gap:7px}.brand-copy strong{font-size:14px}.brand-emblem{width:32px;height:32px}.sidebar{padding-left:12px;padding-right:12px}main{padding:27px 25px 42px}.player-grid{grid-template-columns:minmax(0,1fr) 220px;gap:18px}.inspector{padding-left:18px}.control-group{margin-bottom:20px}.experiment-stage{aspect-ratio:800/680;min-height:400px}.catalog-grid{gap:24px 18px}.page-top h1{font-size:27px}.lesson-card h2{font-size:14px}}
@media(max-width:950px){.catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.player-grid{grid-template-columns:1fr}.experiment-stage{aspect-ratio:900/620;min-height:360px}.inspector{border-left:0;border-top:1px solid var(--line);padding:22px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:0 28px}.inspector h2{grid-column:1/-1;margin-bottom:20px}.inspector-controls{display:contents}.metrics{grid-column:1/-1;flex-direction:row;justify-content:space-between;flex-wrap:wrap;gap:20px}.metric-row{gap:14px}.toggles{border:0;grid-column:1/-1;flex-direction:row;gap:25px;flex-wrap:wrap}.toggle-row{gap:12px}.player-actions{grid-column:1/-1;grid-template-columns:2fr 1fr 1fr;gap:10px}.player-actions>.button-primary{grid-column:auto}.record-button{grid-column:1/-1}.model-details{grid-column:1/-1}.lesson-bottom{grid-template-columns:1fr;gap:16px}}
@media(max-width:680px){.app-shell{display:block}.mobile-bar{display:flex;position:sticky;top:0;z-index:40;height:59px;align-items:center;gap:10px;padding:0 15px;background:#fafbf9ed;backdrop-filter:blur(12px);border-bottom:1px solid var(--line);font-size:13px}.mobile-bar b{font-weight:400;color:var(--muted);font-size:10px;margin-left:5px}.sidebar{position:fixed;top:59px;left:0;width:225px;height:calc(100dvh - 59px);transform:translateX(-100%);transition:transform .2s;overflow:auto}.sidebar.is-open{transform:translateX(0)}.sidebar .brand{display:none}.screen-shade:not([hidden]){display:block;position:fixed;inset:59px 0 0;background:#20302866;z-index:20}main{padding:22px 20px 38px}.breadcrumb{margin-bottom:17px;font-size:10px}.page-top{flex-wrap:wrap;margin-bottom:22px;padding-bottom:20px;gap:12px}.page-top h1{font-size:25px}.page-top p{font-size:12px;margin-top:8px}.page-top .lesson-question{font-size:13px}.search-box{width:100%;max-width:100%;margin-top:5px}.catalog-grid{gap:25px 16px}.lesson-card h2{font-size:13px;line-height:1.55;padding-right:0}.lesson-card p{font-size:11px;min-height:39px}.lesson-meta{font-size:9px;gap:4px}.lesson-meta span+span:before{margin-right:4px}.thumb-tag{top:8px;left:8px;font-size:9px;padding:3px}.catalog-toolbar{font-size:10px}.text-link{font-size:10px}.lesson-thumbnail{aspect-ratio:1.4}.experiment-stage{aspect-ratio:1.2;min-height:290px;border-radius:7px}.scene-label{font-size:10px;padding:3px 5px}.scene-hint{font-size:8px;left:10px;bottom:8px}.player-heading-actions{margin-left:auto}.player-grid{gap:15px}.inspector{gap:0 20px}.control-heading{font-size:12px}.control-number input{width:53px;font-size:15px}.control-group{margin-bottom:20px}.scene-view-row{min-height:49px}.segment-control button{min-width:62px;font-size:11px}.principle{font-size:12px;gap:9px;padding-top:15px;margin-top:10px}.inspector h2{font-size:14px}.metric-value{font-size:15px}.metric-row{font-size:10px}.toggles{gap:16px}.toggle-row{font-size:12px}.model-details{font-size:10px}.lesson-bottom{margin-top:22px}.formula-block{font-size:11px}.fullscreen-fallback{padding:12px}.fullscreen-fallback .experiment-stage{height:75vh}.lesson-previous-next button{font-size:10px}.scene-view-row .view-button-inner img{display:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{.sidebar,.mobile-bar,.player-actions,.search-box,.lesson-previous-next,.scene-view-row{display:none}.app-shell{display:block}main{padding:0}.player-grid{grid-template-columns:1fr}.inspector{border:0}.experiment-stage{max-height:550px}.print-title{display:block}}

/* Diagram scenes use the same calibrated surface and visual language as the player. */
.experiment-stage[data-renderer=diagram]{aspect-ratio:900/540;min-height:0;max-height:none;background:#fafcf9;border:1px solid #dce6df;border-radius:12px}
.experiment-stage[data-renderer=diagram]>canvas{width:100%;height:100%;object-fit:fill}
.experiment-stage[data-renderer=diagram] .scene-hint{display:none}
.scene-handles{position:absolute;inset:0;pointer-events:none;z-index:4}
.scene-handle{position:absolute;transform:translate(-50%,-50%);width:40px;height:40px;padding:0;border:0;border-radius:50%;display:grid;place-items:center;pointer-events:auto;background:transparent;cursor:grab;touch-action:none;z-index:1}
.scene-handle:hover,.scene-handle:focus-visible{background:#237a5712;outline:0;z-index:5}
.scene-handle:focus-visible{box-shadow:0 0 0 2px #237a5780}
.handle-dot{width:12px;height:12px;border:2px solid #237a57;border-radius:50%;background:#fff;box-shadow:0 0 0 3px #ffffffbd,0 2px 6px #173b2629;transition:transform .15s}
.scene-handle:hover .handle-dot,.scene-handle:focus-visible .handle-dot{transform:scale(1.15)}
.handle-label{position:absolute;bottom:44px;left:50%;transform:translateX(-50%);white-space:nowrap;padding:6px 10px;border:1px solid #d8e4db;border-radius:5px;background:#fffffff5;color:#2d4c3a;font-size:12px;box-shadow:0 3px 12px #1834210c;opacity:0;pointer-events:none}
.scene-handle:hover .handle-label,.scene-handle:focus-visible .handle-label{opacity:1}
[data-dragging=true] .scene-handle{cursor:grabbing}
.scene-interaction-caption{display:inline-flex;align-items:center;gap:8px;color:#697b6f;font-size:12px;line-height:1.6}
.scene-interaction-caption>span{width:8px;height:8px;border:1.5px solid #237a57;border-radius:50%;background:#fff}
@media(max-width:680px){.experiment-stage[data-renderer=diagram]{aspect-ratio:900/600;border-radius:9px}.scene-handle{width:44px;height:44px}.handle-dot{width:10px;height:10px}.handle-label{font-size:11px}.scene-interaction-caption{font-size:11px}}
.scene-handle:active{transform:translate(-50%,-50%)}
.scene-handle[data-label-side=below] .handle-label{bottom:auto;top:44px}
.scene-handle[data-label-align=left] .handle-label{left:0;transform:none}
.scene-handle[data-label-align=right] .handle-label{left:auto;right:0;transform:none}
.handle-label{max-width:min(220px,60vw);white-space:normal;line-height:1.5;width:max-content;text-align:left}
.experiment-stage[data-renderer=diagram]>canvas{touch-action:pan-y pinch-zoom}

/* The newest lessons share the library cards and the classroom scene controls. */
.latest-section{max-width:1450px;margin:4px 0 36px;padding:0 0 30px;border-bottom:1px solid var(--line)}
.section-heading{display:flex;align-items:baseline;gap:14px;margin-bottom:20px}
.section-heading h2{font-size:23px;font-weight:600;letter-spacing:-.025em;margin:0}
.section-heading>span{font-size:12px;color:var(--muted)}
.latest-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:20px}
.latest-grid .lesson-card h2{font-size:15px;padding-right:0}
.latest-grid .lesson-card p{min-height:43px}
.latest-grid .lesson-thumbnail{aspect-ratio:1.65}
.latest-grid .card-footer{margin-top:10px}
.lesson-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:0 0 18px}
.lesson-actions:empty{display:none}
.lesson-actions .button-outline{font-size:12px;padding:9px 8px;min-height:38px;line-height:1.4}
.lesson-actions button[aria-pressed=true]{background:var(--green-tint);border-color:#8bb59b;color:var(--green-dark)}
.select-control{display:flex;flex-direction:column;gap:10px;font-size:14px}
.select-control select{width:100%;min-height:38px;border:1px solid #d5ded7;background:#fff;color:var(--ink);border-radius:6px;padding:6px 10px;font-size:14px}
.toggle-control{display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:14px;margin-bottom:18px}
.toggle-control input{appearance:none;-webkit-appearance:none;width:35px;height:21px;flex-shrink:0;border-radius:20px;background:#cbd5cb;cursor:pointer;position:relative;margin:0}
.toggle-control input:after{content:'';position:absolute;left:3px;top:3px;width:15px;height:15px;background:#fff;border-radius:50%;box-shadow:0 1px 3px #0002}
.toggle-control input:checked{background:var(--green)}
.toggle-control input:checked:after{left:17px}
@media(max-width:1350px){.latest-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:24px 20px}}
@media(max-width:950px){.lesson-actions{grid-column:1/-1;grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:680px){.latest-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 16px}.latest-section{margin-bottom:26px;padding-bottom:24px}.section-heading h2{font-size:19px}.section-heading>span{font-size:10px}.latest-grid .lesson-card h2{font-size:13px}.latest-grid .lesson-card p{font-size:11px}.lesson-actions{grid-template-columns:1fr 1fr}.select-control,.toggle-control{font-size:12px}.select-control select{font-size:13px;min-height:37px}}
.scene-actions{grid-template-columns:repeat(3,minmax(0,1fr));margin:5px 0 18px;gap:9px}
.scene-actions:has(>button:only-child){grid-template-columns:minmax(160px,220px);justify-content:center}
.rich-lesson .inspector h2{margin-bottom:20px}
.rich-lesson .control-group{margin-bottom:20px}
.rich-lesson .control-heading{margin-bottom:9px}
.rich-lesson .toggle-control{margin-bottom:16px}
@media(max-width:680px){.scene-actions{grid-template-columns:1fr 1fr}.rich-lesson .control-group{margin-bottom:18px}}