.m1-page main{max-width:1180px;padding-top:32px;min-height:75vh}
.m1-heading{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:24px}
.m1-heading h1{margin:0;font-size:2rem}.m1-heading p{margin:4px 0;color:#41556d}.m1-heading p span{display:inline-block}
.m1-paper-link,.m1-link{display:inline-flex;align-items:center;min-height:44px;padding:8px 12px;border:1px solid #b6c7d9;border-radius:7px;background:white;text-decoration:none;font-weight:650}
.m1-filters{background:white;border:1px solid #ccd8e8;border-top:4px solid #087f71;border-radius:10px;padding:24px}
.m1-topic-label{font-size:1.125rem}.m1-topic-label select{display:block;margin-top:8px;min-height:52px;font-size:1rem;border-color:#087f71;max-width:100%}
.m1-filter-row{display:grid;grid-template-columns:1fr 1.2fr 1.8fr;gap:16px}.m1-filter-row label{margin-bottom:0}.m1-filter-row :is(select,input){display:block;margin-top:6px;min-width:0}
.m1-filter-footer{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap;margin-top:16px}
.m1-check{display:flex;align-items:center;gap:8px;margin:0;font-weight:500}.m1-check input{width:20px;height:20px;accent-color:#087f71}
.m1-meta{font-size:.875rem;color:#41556d;line-height:1.6}.m1-filters>.m1-meta{margin:12px 0 0}
.m1-results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.m1-card{background:white;border:1px solid #ccd8e8;border-radius:9px;padding:20px;display:flex;flex-direction:column;align-items:flex-start;min-width:0}
.m1-card h2{font-size:1.25rem;margin:4px 0}.m1-card .m1-meta{margin:4px 0 10px}.m1-card .m1-topics{margin:0 0 12px;line-height:1.6;overflow-wrap:anywhere}.m1-card button{margin-top:auto}.m1-badge{font-size:.875rem;color:#086b60;font-weight:650}
.m1-page button,.m1-page summary{min-height:44px}.m1-page button{border-radius:7px}.m1-page #more{display:block;margin:24px auto}
.m1-papers{border-top:1px solid #ccd8e8;margin-top:36px;padding-top:12px;scroll-margin-top:24px}.m1-papers h2{font-size:1.25rem}.m1-papers h2 span{font-size:1rem;font-weight:500}
#paper-list{display:flex;flex-wrap:wrap;gap:10px}#paper-list button{min-width:84px}
.m1-empty{padding:28px;background:white;border:1px dashed #9aadbd;border-radius:9px;grid-column:1/-1}.m1-empty p{margin:0 0 12px}
#exercise{scroll-margin-top:16px}.m1-exercise-head{margin-top:22px}.m1-exercise-head h2{margin:8px 0;font-size:1.6rem}.m1-exercise-head p{margin:8px 0}.m1-exercise-head:focus{outline:none}
.m1-parts{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.m1-parts button[aria-pressed=true]{background:#087f71;color:white;border-color:#087f71}
.m1-part-info{padding:14px 16px;background:#e8f2f3;border-left:3px solid #087f71;margin:12px 0}.m1-part-info p{margin:4px 0}.m1-part-info [lang=en]{color:#334961}
.m1-reader{background:white;border:1px solid #ccd8e8;border-radius:10px;margin:18px 0;overflow:hidden}
.m1-reader-tools{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:12px;border-bottom:1px solid #ccd8e8}.m1-reader-tools label{display:flex;align-items:center;gap:8px;margin:0}.m1-reader-tools select{width:auto;max-width:160px}
.m1-page-image{overflow:auto;max-height:none;background:#e7edf5;-webkit-overflow-scrolling:touch}.m1-page-image img{display:block;width:100%;height:auto;margin:auto;max-width:none}.m1-page-image.zoomed img{width:1600px;max-width:none;margin:0}
.m1-image-caption{padding:10px 14px;margin:0;color:#41556d;font-size:.875rem}.m1-reader-error{padding:16px;background:#fff2dd;color:#654408}
.m1-bottom-nav{display:flex;flex-wrap:wrap;gap:12px;margin:20px 0}.m1-reading-note{font-size:.875rem;color:#41556d}
@media(max-width:650px){.m1-heading{align-items:flex-start;flex-direction:column;gap:10px}.m1-heading h1{font-size:1.75rem}.m1-heading p span{display:block;font-size:.875rem}.m1-filters{padding:16px}.m1-filter-row{grid-template-columns:1fr 1fr;gap:12px}.m1-filter-row label:last-child{grid-column:1/-1}.m1-results{grid-template-columns:1fr}.m1-card{padding:18px}.m1-reader-tools{gap:8px}.m1-reader-tools select{max-width:135px}.m1-part-info{padding:12px}.m1-page main{padding-top:24px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
.m1-filter-checks{display:flex;flex-wrap:wrap;gap:12px 24px}.m1-exercise-links{margin:16px 0}
.m1-stats{min-width:0}.m1-stats h3{font-size:1.125rem;margin:0 0 12px}.m1-stats select{display:block;max-width:100%;margin-top:6px}.m1-stats-chart{overflow-x:auto;border:1px solid #d0deea;background:#fbfdff;border-radius:8px;max-width:100%;-webkit-overflow-scrolling:touch}
.m1-stats-chart svg{display:block;width:100%;height:auto}.m1-stats-chart text{font:14px system-ui,sans-serif;fill:#334961}.m1-stats-chart .stat-bar{fill:#327c9b}.m1-stats-chart .stat-highlight{fill:#aa5016}.m1-stats-chart .stat-shade{fill:#57b2d1;opacity:.45}.stat-track{fill:#e3ebf2}.stat-interval{stroke:#087f71;stroke-width:7;stroke-linecap:round}.stat-tree-selected{stroke:#aa5016;stroke-width:3}
.m1-stats-slider{display:block;margin:16px 0 0;font-size:1rem}.m1-stats-slider output{font-weight:700;font-variant-numeric:tabular-nums}.m1-stats .m1-visual-values p{margin:5px 0;line-height:1.6}.m1-stats-coverage{padding:12px;border-left:3px solid #a76e17;background:#fff8eb;line-height:1.6}
.m1-stats-chart text{paint-order:stroke;stroke:#fbfdff;stroke-width:4px;stroke-linejoin:round}
.m1-stats-table{font-size:.875rem;max-width:100%;margin:16px 0}.m1-stats-table summary{display:flex;align-items:center;cursor:pointer;color:#075d54;font-weight:650}.m1-stats-table summary:before{content:'＋';margin-right:6px}.m1-stats-table[open] summary:before{content:'−'}.m1-stats-table>div{overflow-x:auto}.m1-stats-table table{border-collapse:collapse;width:100%}.m1-stats-table th,.m1-stats-table td{padding:10px;border-bottom:1px solid #d0deea;text-align:left;min-width:65px;overflow-wrap:anywhere}.m1-stats-table th{background:#edf5f8}
.m1-scope-summary{font-size:.875rem;line-height:1.6;overflow-wrap:anywhere;margin:4px 0 14px}.m1-scope-summary p{margin:4px 0}
.m1-scope-out{color:#983719;font-weight:650}.m1-scope-adapt{color:#785000;font-weight:650}.m1-scope-current{color:#086b60;font-size:.875rem;font-weight:650}
.m1-scope-notice{padding:14px 16px;border:1px solid #dbc69f;border-left:4px solid #a76e17;border-radius:6px;background:#fff8eb;color:#604417;margin:14px 0;line-height:1.65;overflow-wrap:anywhere}
.m1-scope-notice.is-out{background:#fff4ef;color:#813019;border-color:#d8b8a8;border-left-color:#a04425}.m1-scope-notice p{margin:8px 0 0}.m1-scope-notice p[lang=en]{font-size:.875rem;color:inherit}
.m1-scope-detail{font-size:.875rem;margin:8px 0;overflow-wrap:anywhere}.m1-scope-detail summary{cursor:pointer;display:flex;align-items:center;list-style:disclosure-closed}.m1-scope-detail summary:before{content:'＋';margin-right:6px}.m1-scope-detail[open] summary:before{content:'−'}
.m1-parts button{white-space:normal;max-width:100%;line-height:1.5;text-align:left}.m1-parts button.scope-out{border-color:#b67b61;color:#813019}.m1-parts button.scope-adapt{border-color:#ae893e;color:#705014}.m1-parts button.scope-out[aria-pressed=true]{background:#983719;color:white}.m1-parts button.scope-adapt[aria-pressed=true]{background:#785000;color:white}
.m1-support .m1-support-scope{background:#fff8eb;padding-bottom:8px}.m1-support-scope .m1-scope-summary{margin-bottom:0}.m1-check input{flex-shrink:0}
.m1-support{background:#fff;border:1px solid #b6c7d9;border-radius:10px;margin:18px 0;scroll-margin-top:20px}
.m1-support>summary{padding:16px;cursor:pointer;font-weight:700;color:#075d54}.m1-support>summary span{display:block;margin:6px 0 0 18px;font-size:.85rem;font-weight:400;color:#41556d}
.m1-support[open]>summary{border-bottom:1px solid #dce5ed}.m1-support>div{padding:18px;min-width:0}.m1-support .m1-reader{margin-bottom:14px}
.m1-visual-formula{font-size:1.15rem;font-weight:700;overflow-wrap:anywhere}.m1-graph{background:#fbfdff;border:1px solid #dce5ed;border-radius:8px;overflow:hidden}.m1-graph svg{display:block;width:100%;height:auto;min-height:220px}
.m1-graph text{font:14px system-ui,sans-serif;fill:#334961}.graph-grid{stroke:#e1e8ef;stroke-width:1}.graph-axis{stroke:#52677e;stroke-width:1.4}.graph-curve{fill:none;stroke:#087f71;stroke-width:3;vector-effect:non-scaling-stroke}.graph-base{fill:none;stroke:#52677e;stroke-width:2;stroke-dasharray:4 4}.graph-reference{stroke:#6d7583;stroke-width:1.4;stroke-dasharray:6 5}.graph-tangent{stroke:#b35610;stroke-width:2;stroke-dasharray:8 4;vector-effect:non-scaling-stroke}.graph-positive{fill:#0d94ce;opacity:.24}.graph-negative{fill:#a23a76;opacity:.24}.graph-trapezoid{fill:none;stroke:#b35610;stroke-width:1.6}.graph-dot{fill:#0b1f3a;stroke:white;stroke-width:2}.graph-external{fill:#b35610}
.m1-visual-controls{display:grid;grid-template-columns:minmax(180px,1fr) auto;gap:16px;align-items:center;margin-top:16px}.m1-visual-controls label{margin:0}.m1-visual-actions{display:flex;gap:8px;flex-wrap:wrap}.m1-visual-values{font-variant-numeric:tabular-nums;background:#eef5fa;padding:12px;line-height:1.65;overflow-wrap:anywhere}
.m1-visual-options{display:flex;gap:16px;flex-wrap:wrap}.m1-strips{display:block;max-width:500px;margin-top:18px}.m1-strips output{font-weight:700}.m1-page input[type=range]{display:block;width:100%;height:44px;padding:0;accent-color:#087f71;cursor:ew-resize}.m1-visual-hints{padding-left:24px}.m1-visual-hints li{padding:7px 0;line-height:1.7}
@media(max-width:650px){.m1-support>div{padding:12px}.m1-visual-controls{grid-template-columns:1fr}.m1-graph svg{min-height:180px}.m1-graph text{font-size:16px}.m1-support>summary{padding:14px}.m1-filter-checks{flex-direction:column}.m1-visual-options{flex-direction:column}}

/* A question-first workspace. Help stays closed until the student asks for it. */
.m1-exercising main{max-width:1440px;padding-top:0}.m1-exercising .m1-heading{display:none}
.m1-practice-nav{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 0;background:#f4f7fbf5;border-bottom:1px solid #ccd8e8}
.m1-sequence{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}.m1-sequence span{font-size:.875rem;color:#41556d;margin-right:8px}
.m1-bottom-nav{justify-content:space-between;align-items:center;border-top:1px solid #ccd8e8;padding-top:18px}
.m1-exercise-head{margin-top:16px}.m1-exercise-head h2 small{font-size:1rem;white-space:nowrap;color:#41556d;font-weight:500}
.m1-part-info{padding:10px 14px}.m1-part-info p{margin:2px 0}.m1-part-info [lang=en]{font-size:.875rem}
.m1-topic-details>summary{cursor:pointer;display:list-item;min-height:44px;align-content:center}.m1-topic-details[open]{margin-bottom:8px}
.m1-exercise-links{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}.m1-exercise-links .m1-layout-mode{margin-left:auto}
.m1-workspace{display:grid;grid-template-columns:minmax(0,1fr);gap:18px;scroll-margin-top:90px}
.m1-question-pane,.m1-support-pane{min-width:0}.m1-support-pane:empty{display:none}.m1-support-pane .m1-support{margin:0 0 16px;scroll-margin-top:90px}
.m1-reader-heading{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px}.m1-reader-heading h3{font-size:1.125rem;margin:4px 0}
.m1-question-pane .m1-reader{margin:12px 0}.m1-crop-reader .m1-reader-tools span{font-size:.875rem;color:#41556d}
.m1-crop-images{background:white;touch-action:pan-x pan-y pinch-zoom}.m1-crop-images figure{margin:0;padding:0 0 12px}.m1-crop-images figure+figure{border-top:2px solid #ccd8e8;margin-top:12px}
.m1-crop-images figcaption{font-size:.875rem;color:#41556d;padding:10px 12px;background:#eef5fa;position:sticky;left:0;max-width:100%}
.m1-crop-images img{width:100%;height:auto;margin:0 auto}.m1-crop-images.zoomed img{width:var(--crop-width);min-width:100%;max-width:none;margin:0}
.m1-page .m1-reader-tools button,.m1-page .m1-reader-heading button{white-space:normal}.m1-page .m1-reader-tools>*{max-width:100%}
.m1-practice-nav button:disabled,.m1-bottom-nav button:disabled{background:#e8edf3;color:#5e6e80;opacity:.7}
@media(min-width:1000px){
  .m1-workspace.has-support:not(.is-single){grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);align-items:start}
  .m1-workspace.has-support:not(.is-single) .m1-question-pane{position:sticky;top:86px;max-height:calc(100dvh - 106px);overflow:auto;overscroll-behavior:contain;padding-right:6px;scrollbar-gutter:stable}
}
@media(max-width:999px){.m1-layout-mode{display:none!important}}
@media(max-width:650px){
  .m1-practice-nav{align-items:center;gap:6px;padding:8px 0}.m1-practice-nav>button{font-size:.875rem;padding:8px}
  .m1-sequence{gap:6px}.m1-sequence span{flex-basis:100%;text-align:right;margin:0;font-size:.875rem}.m1-sequence button{padding:8px 10px}
  .m1-exercise-head h2{font-size:1.35rem}.m1-workspace,.m1-support-pane .m1-support{scroll-margin-top:105px}
  .m1-reader-heading h3{font-size:1rem}.m1-reader-heading button{font-size:.875rem}.m1-bottom-nav{align-items:flex-end}
}