@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;450;500;550;600;650;700;750;800;900&display=swap');
:root{--blue:#2563eb;--blue-dark:#1d4ed8;--navy:#172b4d;--ink:#233652;--muted:#77849a;--line:#e3eaf3;--soft:#f3f8ff;--green:#1b9b87;--radius:18px;font-family:'Noto Sans KR',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:var(--navy);background:#fff;font-synthesis:none;font-size:14px;line-height:1.6}
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button{border:0;background:none;color:inherit}a{color:inherit;text-decoration:none}button:disabled{cursor:default;opacity:.5}svg{display:block}h1,h2,h3,p{margin:0}button,a,input,select,summary{outline-offset:5px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #7aabff}::selection{background:#dbeafe}button{touch-action:manipulation}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-70px;left:20px;z-index:20;background:var(--blue);color:#fff;padding:12px 20px;border-radius:8px}.skip-link:focus{top:12px}.content-width{max-width:1160px;margin:0 auto;padding:0 24px}.site-header{height:84px;background:#fffffff5;border-bottom:1px solid #edf1f6;position:relative;z-index:5}.header-inner{height:100%;max-width:1280px;margin:auto;padding:0 44px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;gap:10px;align-items:center}.brand-mark{width:39px;height:41px;border-radius:12px;background:var(--blue);color:white;padding:4px;box-shadow:0 3px 7px #2563eb14}.brand-mark svg{width:100%;height:100%}.brand-name{font-family:Arial,sans-serif;font-weight:800;font-size:28px;letter-spacing:-1.6px;line-height:1.2}.brand-name>span{color:var(--blue)}.brand-name small{font-family:'Noto Sans KR',sans-serif;letter-spacing:-.2px;font-size:10px;font-weight:500;color:#8090a6;margin-left:10px;vertical-align:middle}.site-header nav{display:flex;align-items:center;gap:30px;font-size:13px;font-weight:550}.site-header nav a:hover,.nav-guide:hover{color:var(--blue)}.site-header nav a.active{color:var(--blue)}.nav-guide{padding:8px 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.15s}.switch[aria-checked=true]{background:var(--blue)}.switch[aria-checked=true]:after{transform:translateX(16px)}.control-actions{display:flex;gap:7px;margin-top:12px}.control-actions .primary-button{flex:1;padding:10px 12px}.control-actions .secondary-button{padding:10px 12px;white-space:nowrap}.control-note{font-size:10px;line-height:1.85;color:#91a0b2;background:#f6f9fd;border-radius:7px;padding:12px;margin-top:17px}.preset-label{font-size:10px;color:#8c9ab0;margin-bottom:7px}.preset-row{display:flex;gap:5px;flex-wrap:wrap;margin:0 0 15px}.preset-row button{border:1px solid #dfe8f5;border-radius:6px;padding:6px 8px;background:#f8faff;font-size:9px;color:#6d83a3}.preset-row button:hover{color:var(--blue);border-color:#a8c8f8}.speed-row{display:flex;align-items:center;justify-content:space-between;margin:0 0 20px;font-size:11px}.speed-row select{font-size:11px;border:1px solid var(--line);padding:5px 8px;border-radius:6px;background:#fff;color:#587392}.constant-pills{display:flex;gap:7px;margin-bottom:20px}.constant-pills span{font-size:9px;color:#6b8ebd;background:#eff5ff;padding:6px 8px;border-radius:6px}.constant-pills span:last-child{color:#388e93;background:#eff9f8}.lab-bottom{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:20px;margin-top:20px}.observation-panel,.inquiry-panel{padding:21px 23px}.lower-heading{display:flex;gap:8px;align-items:center;font-size:13px;font-weight:650;margin-bottom:9px}.lower-heading .mini-icon{font-size:15px;color:#7298d0}.chart-title{font-size:10px;color:#94a2b5;margin:3px 0}.result-chart{height:150px;width:100%}.result-chart svg{width:100%;height:100%;font-family:Arial,'Noto Sans KR',sans-serif}.observation-copy{font-size:11px;line-height:1.9;color:#70839d;background:#f6f9ff;padding:10px 12px;border-radius:7px;margin-top:10px}.inquiry-intro{font-size:10px;color:#9aa7b8;margin-bottom:17px}.question{border-top:1px solid #edf1f7;padding-top:13px;margin-top:12px}.question-title{display:flex;align-items:flex-start;gap:9px;font-size:11px;line-height:1.9;color:#617691}.question-number{font-family:Arial,sans-serif;font-size:10px;display:grid;place-items:center;flex-shrink:0;width:20px;height:20px;border-radius:5px;background:#edf4ff;color:#6794d3;margin-top:2px}.question details{margin:6px 0 0 29px}.question summary{font-size:9px;color:#94a5bf;cursor:pointer;width:max-content}.question details p{font-size:10px;color:#7184a0;line-height:1.9;margin-top:7px}.model-note{margin-top:20px;border:1px solid var(--line);border-radius:10px;padding:14px 18px;font-size:11px;color:#8b9bb2}.model-note>summary{cursor:pointer;font-weight:500}.model-note>p{margin-top:12px;line-height:1.9;color:#7d8da4;font-size:11px}.model-links{display:flex;flex-wrap:wrap;gap:15px;margin:13px 0 0}.model-links a{color:#7294c4;text-decoration:underline;text-underline-offset:3px;font-size:10px}.back-to-experiments{display:inline-flex;align-items:center;gap:8px;font-size:11px;color:#8d9bb0;margin-top:25px}.back-to-experiments:hover{color:var(--blue)}dialog{padding:36px;max-width:520px;width:calc(100% - 32px);border:1px solid var(--line);border-radius:18px;color:var(--navy);box-shadow:0 20px 100px #172b4d33;max-height:90vh;overflow:auto}dialog::backdrop{background:#13274469;backdrop-filter:blur(4px)}.dialog-close{position:absolute;right:18px;top:12px;font-size:26px;font-weight:300;color:#91a0b4;width:30px;height:36px}dialog h2{font-size:28px;line-height:1.5;letter-spacing:-1px;margin-top:12px}.guide-lead{font-size:12px;color:#7f8fa5;line-height:1.9;margin-top:15px}.guide-steps{list-style:none;padding:0;margin:26px 0}.guide-steps li{display:flex;gap:15px;margin-bottom:21px}.guide-steps li>span{font-size:11px;color:var(--blue);font-weight:700;background:#eff5ff;width:31px;height:31px;display:grid;place-items:center;border-radius:9px;flex-shrink:0}.guide-steps h3{font-size:13px;margin-bottom:4px}.guide-steps p{font-size:11px;color:#91a0b4;line-height:1.9}.guide-tip{background:#f2f7ff;border-radius:9px;padding:17px 18px}.guide-tip b{font-size:11px;font-weight:600}.guide-tip p{font-size:11px;color:#8193ad;line-height:1.9;margin-top:7px}.guide-footnote{font-size:10px;color:#9aa8ba;line-height:1.9;margin:17px 0}.guide-done{width:100%}.noscript{margin:20px;text-align:center;padding:30px;background:#fff3dc}
@media(min-width:1450px){.hero{padding-top:63px;padding-bottom:49px}.hero h1{font-size:50px}.card-visual{height:188px}.header-inner{max-width:1320px}.content-width{max-width:1190px}}
@media(max-width:1000px){.header-inner{padding:0 28px}.header-note,.nav-divider{display:none}.hero h1{font-size:42px}.hero-orbit{opacity:.25}.orbit-left{left:35px}.orbit-right{right:35px}.experiment-grid{gap:16px}.card-content{padding:16px 16px 0}.card-content h3{font-size:16px}.card-visual{height:150px}.strip-steps{gap:11px}.learning-strip{padding:21px}.lab-layout{grid-template-columns:minmax(0,1fr) 262px;gap:16px}.control-panel{padding:17px}.metric{padding:0 9px}.metric-value{font-size:21px}.metric-label{font-size:9px}.simulation-stage{min-height:280px}.lab-bottom{gap:16px}.observation-panel,.inquiry-panel{padding:18px}}
@media(max-width:760px){.site-header{height:70px}.header-inner{padding:0 22px}.brand-name{font-size:25px}.brand-name small{display:none}.brand-mark{width:34px;height:36px}.site-header nav{gap:22px;font-size:12px}.hero{padding:41px 22px 28px}.hero h1{font-size:36px;letter-spacing:-1.7px}.eyebrow{font-size:10px;margin-bottom:18px}.hero p{font-size:12px;margin:16px 0 24px}.hero-orbit{display:none}.search-form{padding-left:16px}.search-form input{font-size:13px;height:42px}.search-form>button{min-width:76px;padding:11px 13px;font-size:12px;gap:8px}.search-examples{font-size:10px;gap:13px}.search-examples button{font-size:10px}.category-row{padding:20px 0 26px;gap:8px;flex-wrap:wrap}.category-button{padding:9px 14px;font-size:11px;gap:6px}.category-button svg{width:15px;height:15px}.section-heading{gap:10px;align-items:flex-start}.section-heading h2{font-size:19px}.section-heading p{font-size:11px}.section-kicker{font-size:8px}.text-link{font-size:10px;margin-top:17px;gap:4px}.experiment-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.card-visual{height:150px}.learning-strip{flex-direction:column;align-items:flex-start;gap:18px;padding:22px;margin:28px 0}.strip-steps{align-self:center;gap:21px}.footer-inner{flex-wrap:wrap;gap:12px;padding-top:22px;padding-bottom:22px}.footer-inner>p{display:none}.footer-logo span{font-size:8px}.lab-layout{grid-template-columns:1fr}.lab-heading{margin-bottom:20px}.lab-heading h1{font-size:26px}.lab-heading p{max-width:420px;font-size:11px}.lab-heading>.secondary-button{font-size:10px;padding:8px 10px}.simulation-stage{min-height:250px}.control-panel{padding:20px}.control-fields{display:grid;grid-template-columns:1fr 1fr;gap:0 30px}.control-actions{max-width:360px;margin-left:auto;margin-right:auto}.control-note{font-size:10px}.control-top{margin-bottom:23px}.switch-row{padding-top:0;grid-column:1/-1;max-width:200px;gap:25px}.preset-container{grid-column:1/-1}.control-note{margin-top:16px}.lab-bottom{grid-template-columns:1fr}.lab-view{padding-top:18px}.breadcrumbs{font-size:10px;margin-bottom:21px}.result-chart{height:170px}.stage-caption{font-size:8px}.hero.compact h1{font-size:27px}.hero.compact p{font-size:12px}}
@media(max-width:480px){.content-width{padding-left:20px;padding-right:20px}.header-inner{padding:0 20px}.site-header nav{gap:18px;font-size:11px}.hero h1{font-size:33px}.hero p{font-size:11px}.search-form>svg{width:19px;height:19px}.search-form{gap:9px;padding-left:13px}.search-form input{font-size:12px}.search-form>button{min-width:64px;padding:10px 12px}.search-form>button span{display:none}.search-examples{gap:12px;font-size:9px}.search-examples button{font-size:9px}.category-row{gap:6px;justify-content:space-between}.category-button{font-size:10px;padding:8px 9px;gap:5px}.category-check{display:none!important}.category-button svg{width:13px;height:13px}.section-heading h2{font-size:17px;letter-spacing:-.7px}.section-heading p{font-size:10px}.text-link{font-size:9px;gap:3px;margin-top:15px}.text-link span{font-size:14px}.experiment-grid{grid-template-columns:1fr;gap:19px}.card-visual{height:auto;aspect-ratio:560/270}.card-content{padding:19px 21px 0}.card-content h3{font-size:20px}.card-content>p{font-size:12px;min-height:0}.category-tag{font-size:10px}.card-tags span{font-size:10px}.card-bottom{padding:14px 0 16px;font-size:10px}.card-start{font-size:11px}.learning-strip{padding:22px 18px}.strip-steps{gap:15px;font-size:9px}.strip-intro{gap:12px}.strip-intro h3{font-size:12px}.strip-intro p{font-size:9px}.footer-logo span{font-size:8px;margin-left:9px}.lab-heading{align-items:flex-start}.lab-heading h1{font-size:23px}.lab-heading>.secondary-button{font-size:9px;padding:7px 8px;margin-top:20px}.lab-heading p{font-size:10px;max-width:240px}.simulation-stage{min-height:220px}.panel-heading{padding:14px 15px}.panel-heading h2{font-size:12px}.simulation-status{font-size:9px}.metric-row{padding:15px 5px}.metric{padding:0 9px}.metric-value{font-size:20px}.metric-value small{font-size:9px;margin-left:3px}.metric-label{font-size:9px}.metric-description{font-size:7px}.control-fields{display:block}.control-panel{padding:21px}.control-actions{max-width:none}.slider-field{margin-bottom:24px}.slider-label label{font-size:12px}.slider-label output{font-size:17px}.simulation-stage>svg{min-height:220px}.stage-caption{bottom:8px;left:11px;font-size:7px}.breadcrumbs{font-size:9px}.observation-panel,.inquiry-panel{padding:19px}.lab-bottom{margin-top:16px}dialog{padding:29px 24px}dialog h2{font-size:26px}.empty-state{padding:34px 17px}.empty-state h3{font-size:16px}.empty-state p{font-size:11px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}

#lab-title:focus,#main-content:focus{outline:none}
.book-row{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:21px 0 0}.book-row-label{font-size:11px;color:#7587a2;white-space:nowrap}.book-filters{display:flex;gap:7px;flex-wrap:wrap}.book-button{padding:6px 11px;border:1px solid #e6ecf5;border-radius:7px;color:#8798b1;font-size:10px;display:flex;align-items:center;justify-content:center;gap:8px}.book-button span{color:#a0b3cb;font-size:9px;font-family:Arial,sans-serif}.book-button:hover{border-color:#bdd2f3;color:#4477c6}.book-button.selected{background:#edf4ff;border-color:#c0d5f4;color:#356bcc}.book-button.selected span{color:#6b92cd}.card-textbook-tag{position:absolute;left:13px;top:12px;padding:4px 8px;border:1px solid #d8e5f6;background:#ffffffdb;color:#7192bc;font-size:9px;border-radius:5px;letter-spacing:-.1px}.card-content .card-reference{font-size:9px;line-height:1.6;color:#7d93b1;min-height:0;margin-top:10px}.card-reference span{margin:0 4px;color:#b4c1d2}.card-content .card-bottom{margin-top:12px}.lab-book-reference{display:flex;gap:7px;align-items:center;flex-wrap:wrap;margin-top:11px;font-size:10px;color:#879cb9}.lab-book-reference>span{background:#edf4ff;border:1px solid #dce8fa;color:#6c8fc1;border-radius:4px;padding:1px 6px;margin-right:2px}.lab-book-reference i{font-style:normal;color:#b4c2d5}.extra-select{margin-bottom:22px;min-width:0}.extra-select>label{display:block;font-size:11px;font-weight:550;margin-bottom:9px}.extra-select select{width:100%;min-height:36px;padding:7px 10px;border:1px solid #dce6f4;border-radius:7px;color:#54739b;background:#fff;font-size:11px}.choice-field{border:0;padding:0;margin:0 0 20px;min-width:0;grid-column:1/-1}.choice-field legend{font-size:11px;font-weight:550;padding:0;margin-bottom:9px}.choice-buttons{display:flex;gap:5px;flex-wrap:wrap}.choice-buttons.choice-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.choice-buttons.choice-grid button{white-space:normal;min-width:0}.choice-buttons button{flex:1;min-width:45px;border:1px solid #dfe8f5;border-radius:6px;padding:7px 7px;font-size:10px;color:#8394ac;background:#fff;white-space:nowrap}.choice-buttons button:hover{border-color:#b2cdf7;color:#4279ce}.choice-buttons button.selected{color:#2563eb;border-color:#aecaef;background:#edf4ff}.control-panel [data-action]{border:1px solid #c6d8f4;border-radius:7px;padding:8px 12px;background:#f1f6ff;color:#5e82b6;font-size:11px;margin:0 0 6px}.control-panel [data-action]:hover{background:#e9f2ff;border-color:#8fb4ed}.plugin-equation,.mini-note{font-size:10px;line-height:1.8;color:#8ca0ba;padding:10px 11px;background:#f5f8fd;border-radius:6px;margin:0 0 16px}.textbook-source{border-top:1px solid #e5edf7;padding-top:11px}.textbook-lab .simulation-stage svg{overflow:visible}.textbook-lab .metric-value{font-size:23px}.textbook-lab .metric-description{line-height:1.7}.textbook-lab .lab-heading{align-items:flex-start}.textbook-lab .lab-heading>.secondary-button{margin-top:30px}
@media(max-width:760px){.book-row{gap:10px}.book-row-label{font-size:10px}.book-button{padding:6px 9px;font-size:9px;gap:6px}.lab-book-reference{font-size:9px}.textbook-lab .metric-value{font-size:22px}.choice-buttons button{font-size:11px;padding:9px 8px}.extra-select select{min-height:38px}}
@media(max-width:480px){.book-row{flex-direction:column;align-items:flex-start;gap:10px;padding-top:18px}.book-filters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px;width:100%}.book-button{padding:7px 5px;gap:5px;font-size:9px}.book-button span{font-size:8px}.card-content .card-reference{font-size:10px;margin-top:12px}.card-textbook-tag{font-size:9px;padding:4px 7px}.lab-book-reference{font-size:8px;gap:4px;line-height:1.8;max-width:270px}.textbook-lab .metric-value{font-size:19px}.textbook-lab .metric-description{font-size:7px}.extra-select>label,.choice-field legend{font-size:12px}.extra-select select{font-size:12px}.textbook-lab .lab-heading>.secondary-button{margin-top:21px}}
@media(min-width:761px) and (max-width:960px){.lab-layout{grid-template-columns:1fr}.control-fields{display:grid;grid-template-columns:1fr 1fr;gap:0 32px}.switch-row{grid-column:1/-1;max-width:220px;gap:30px}.preset-container{grid-column:1/-1}.control-actions{max-width:360px;margin-left:auto;margin-right:auto}.simulation-stage{min-height:320px}}
@media(max-width:480px){.category-row{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px}.category-button{flex-direction:column;justify-content:center;gap:5px;padding:8px 2px;font-size:9px}.category-button svg{width:16px;height:16px}.lab-view:not(.textbook-lab) .simulation-stage svg text{font-size:20px}.lab-view:not(.textbook-lab) .simulation-stage svg text[font-size="9"],.lab-view:not(.textbook-lab) .simulation-stage svg text[font-size="10"]{font-size:15px}.lab-view:not(.textbook-lab) .simulation-stage svg text[font-size="22"]{font-size:26px}.lab-view:not(.textbook-lab) .simulation-stage svg tspan{font-size:16px}}

.stage-view-controls{display:none}
@media(max-width:480px){.textbook-lab .simulation-panel{min-width:0}.textbook-lab .stage-view-controls{display:flex;align-items:center;flex-wrap:wrap;gap:8px 12px;padding:10px 14px;background:#f8fbff;border-top:1px solid #e6edf8}.stage-zoom-button{min-height:36px;padding:8px 12px;border:1px solid #cbdcf4;border-radius:7px;background:#fff;color:#5d7ea9;font-size:11px;white-space:nowrap}.stage-zoom-button[aria-pressed="true"]{border-color:#90b4ed;background:#eaf2ff;color:#2965c9}.stage-view-controls p{font-size:10px;line-height:1.6;color:#6d84a4}.textbook-lab .simulation-stage.is-enlarged{display:block;max-width:100%;overflow-x:auto;overflow-y:hidden;overscroll-behavior-x:contain;scrollbar-width:thin}.textbook-lab .simulation-stage.is-enlarged>svg{display:block;width:760px;min-width:760px;max-width:none;height:auto}.textbook-lab .simulation-stage.is-enlarged:focus-visible{outline:3px solid #7aabff;outline-offset:-3px}}
/* Curriculum navigation follows the selected course. */
.course-explorer{margin-top:22px;padding:21px 23px 18px;border:1px solid #dce8f7;border-radius:14px;background:linear-gradient(120deg,#f4f8ff,#fbfdff)}
.course-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:15px}
.course-revision{display:block;color:#5c82b7;font-size:10px;letter-spacing:.2px;margin-bottom:5px}
.course-heading h2{font-size:18px;letter-spacing:-.5px;font-weight:650}
.course-heading p{color:#7b8ba2;font-size:11px}
.unit-filters{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px}
.unit-button{display:flex;justify-content:space-between;align-items:center;gap:9px;padding:10px 13px;border:1px solid #dfe7f2;border-radius:8px;background:#fff;color:#687e9c;font-size:11px;line-height:1.7;text-align:left;min-width:0;word-break:keep-all;overflow-wrap:break-word}
.unit-button>span{flex-shrink:0;display:grid;place-items:center;min-width:19px;height:19px;border-radius:50%;background:#f0f5fc;font:10px Arial,sans-serif;color:#839bbb}
.unit-button:hover{border-color:#a9c5ee;color:#2b64b8}
.unit-button.selected{border-color:#84afea;background:#eaf2ff;color:#225eb6;font-weight:550}
.unit-button.selected>span{background:#d6e6ff;color:#3266ae}
.course-note{color:#8695a9;font-size:10px;line-height:1.8;margin-top:12px}
.curriculum-standards{display:flex;align-items:center;gap:6px;flex-wrap:wrap;font-size:11px;color:#72849e;margin-top:12px}
.curriculum-standards span{border:1px solid #dfE8f3;border-radius:4px;padding:2px 6px;color:#6684ac;font-size:10px}
@media(max-width:600px){.course-explorer{padding:16px 15px;margin-top:18px}.course-heading{align-items:flex-start;flex-direction:column;gap:7px;margin-bottom:13px}.course-heading h2{font-size:17px}.unit-filters{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.unit-button{padding:9px;font-size:11px;gap:6px}.course-note{font-size:10px}.course-heading p{font-size:11px}}

/* Three compact disclosures keep all 15 course choices easy to reach. */
.book-row{display:block;padding-top:22px}
.book-row-label{display:block;font-size:12px;font-weight:550;margin-bottom:11px}
.book-filters{display:block;width:100%}
.book-overview{display:flex;align-items:center;gap:15px;margin-bottom:10px}
.book-overview p{color:#8a99ad;font-size:11px}
.book-overview>.book-button{min-width:85px}
.book-group{border:1px solid #e3ebf5;border-radius:9px;margin-top:7px;background:#fff;overflow:hidden}
.book-group summary{display:flex;align-items:center;gap:17px;padding:11px 15px;cursor:pointer;list-style:none;font-size:12px;font-weight:550;color:#4d6688}
.book-group summary::-webkit-details-marker{display:none}
.book-group summary small{font-size:10px;font-weight:400;color:#8b9ab0}
.book-group summary:hover{background:#f8fbff}
.book-group[open]>summary{background:#f6f9fe;border-bottom:1px solid #e9eff7}
.book-group-chevron{margin-left:auto;font-size:18px;line-height:1;color:#92a7c2;transition:transform .15s}
.book-group[open] .book-group-chevron{transform:rotate(180deg)}
.book-group-buttons{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;padding:12px}
.book-group .book-button{justify-content:space-between;text-align:left;font-size:11px;padding:9px 12px;min-height:39px;word-break:keep-all;line-height:1.6}
.book-group .book-button span{flex-shrink:0}
@media(max-width:600px){.book-group-buttons{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;padding:9px}.book-group summary{padding:11px 12px;gap:12px}.book-group summary small{font-size:9px}.book-group .book-button{padding:9px 10px;font-size:11px}.book-overview{gap:12px}.book-overview p{font-size:10px}.book-row-label{font-size:11px}}
@media(prefers-reduced-motion:reduce){.book-group-chevron{transition:none}}

.coriolis-lab .lab-heading h1{word-break:keep-all}
.coriolis-control-hint{grid-column:1/-1;margin:-8px 0 18px;padding:10px 11px;border-radius:7px;background:#f2f7fc;font-size:10px;line-height:1.8;color:#71859f;word-break:keep-all}
@media(min-width:761px){.coriolis-lab .simulation-panel{position:sticky;top:20px}}

/* Extension diagrams retain their authored SVG font sizes; enlarge the whole diagram with the mobile zoom control. */