/* Catalog36: neutral surfaces, blue selection, local semantic feedback. */
.c-header,.c-focus-header{height:52px;display:flex;align-items:center;justify-content:space-between;padding:0 max(20px,calc((100% - 1100px)/2));border-bottom:1px solid #303b45;color:#bacbd8;font-size:13px}.c-brand{font-size:20px;font-weight:650;color:#f3f5f7}.c-focus-header{height:44px;border:0}.c-focus-header button{font-size:25px;min-width:44px;min-height:44px}
.c-catalog,.c-journey{max-width:1100px;margin:auto;padding:48px 24px 60px}.c-page-title{margin-bottom:30px}.c-page-title h1{max-width:780px;font-size:34px;line-height:1.25}.c-page-title p,.c-muted{color:#acbbc7;margin-top:12px;font-size:15px;line-height:1.6}.c-review-link,.c-back{display:inline-block;font-size:13px;color:#a6d7ef;margin-top:18px;text-decoration:underline;text-underline-offset:3px}.c-back{margin:0 0 26px}
.c-group{margin-bottom:14px;border:1px solid #405567;border-radius:15px;overflow:hidden;background:#1c2229}.c-group h2{margin:0}.c-group-toggle{display:flex;align-items:center;justify-content:space-between;text-align:left;width:100%;min-height:88px;padding:20px 26px;background:var(--color-accordion);color:#eff5fa;font-size:23px;font-weight:650}.c-group-toggle small{display:block;font-size:12px;font-weight:400;color:#b3c5d3;margin-top:4px}.c-chevron{font-size:26px;transition:transform 220ms ease}.c-group-toggle[aria-expanded=true] .c-chevron{transform:rotate(180deg)}.c-group-panel{overflow:hidden;transition:height 260ms ease,opacity 200ms ease}.c-card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;padding:20px}
.c-card{min-width:0;border:1px solid #425564;border-radius:var(--layout-card-radius-px);padding:20px;background:#222a32;display:flex;flex-direction:column;gap:14px}.c-card h2{font-size:16px;font-weight:550;line-height:1.6;letter-spacing:0}.c-card-math{font-size:25px;min-height:80px;display:flex;align-items:center;justify-content:center;max-width:100%;overflow-x:auto;padding:10px 2px}.c-card-math .math-notation{max-width:100%}.c-domain{color:#bccbd6;font-size:12px;line-height:1.5}.c-card-bottom{margin-top:auto}.c-card-status{display:block;font-size:11px;color:#b0c0cc;margin:4px 0 12px}.c-card .primary{width:100%;font-size:14px;min-height:46px}.c-card .primary:disabled{background:#303a43;border-color:#425564;color:#99a9b6}.c-detail{display:block;margin:10px auto 0;min-height:32px;text-decoration:underline;font-size:12px;color:#b9ccda}.c-footnote{font-size:12px;line-height:1.7;color:#a4b5c2;margin-top:28px}.c-completion{padding:14px 18px;background:#1d2d39;border-left:2px solid #80c2de;margin-bottom:24px;font-size:14px}
.c-journey{max-width:700px}.c-journey h1{font-size:26px;line-height:1.5}.c-journey-formula{font-size:32px;text-align:center;padding:28px 8px;overflow:auto}.c-route-list{list-style:none;padding:0;margin:28px 0}.c-route-list li+li{margin-top:10px}.c-route-list button{display:flex;align-items:center;text-align:left;width:100%;border:1px solid #435c6e;border-radius:12px;gap:18px;padding:18px}.c-route-list button>span{border-radius:50%;width:34px;height:34px;display:grid;place-items:center;background:#28475d;color:#c8eeff}.c-route-list small{display:block;color:#b1bfca;font-size:12px;margin-top:3px}.c-route-list button:disabled{opacity:.5}.c-resume{width:100%;margin-top:20px}.c-reset-route{display:block;margin:14px auto;min-height:40px;text-decoration:underline;color:#b5c6d3;font-size:13px}.c-review-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:28px}.c-review-card{display:flex;flex-direction:column;gap:10px;text-align:left;border:1px solid #456079;border-radius:12px;padding:20px;min-height:140px;background:#202d39}.c-review-card small{color:#abbdca}.c-review-card:disabled{opacity:.5}
.c-progress-wrap{max-width:700px;display:flex;align-items:center;gap:28px;padding:14px 20px 12px;margin:auto;height:48px}.c-progress{height:var(--layout-progress-height-px);border-radius:var(--layout-progress-height-px);background:#3b444d;overflow:hidden;flex:1}.c-progress>span{display:block;height:100%;background:#38bdf8}.c-notes{font-size:12px;min-width:38px;min-height:32px;color:#b7ccda}.c-lesson{position:relative;max-width:652px;margin:auto;padding:12px 20px 16px;min-height:calc(100svh - 92px);display:grid;grid-template-rows:auto minmax(290px,1fr) auto;gap:14px}.c-question small{font-size:11px;color:#9eb6c8}.c-question h1{font-size:22px;line-height:1.35;margin:7px 0 8px;letter-spacing:-.4px}.c-question>p{font-size:14px;line-height:1.6}.c-question .c-domain{font-size:11px;margin-top:5px}
.c-arena{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;min-width:0;padding:10px 0 18px}.c-stimulus{font-size:var(--type-math-base-px);max-width:100%;overflow-x:auto;text-align:center;padding:8px 2px}.c-small{font-size:12px;line-height:1.6;color:#b6c8d5;text-align:center}.c-choices{display:flex;flex-direction:column;width:100%;gap:12px}.c-option{position:relative;display:flex;align-items:center;gap:15px;width:100%;padding:17px 20px;text-align:left;background:#222a32;border:1px solid #536675;border-radius:13px;min-height:66px;font-size:15px;line-height:1.55}.c-option-mark{border:1px solid #7890a3;border-radius:5px;min-width:20px;height:20px;font-size:14px;line-height:18px;text-align:center}.c-option-math{font-size:27px}.c-option[aria-pressed=true],.c-option[aria-checked=true]{border:2px solid #38bdf8;background:#19384b;padding:16px 19px}.c-option:disabled{opacity:1;color:#eff6fa}.c-multi-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%;max-width:430px;gap:12px}.c-multi{min-height:110px;justify-content:center;flex-direction:column;padding:20px 16px}.c-multi .c-option-mark{position:absolute;top:10px;right:10px}.c-multi[aria-checked=true]{padding:19px 15px}
.c-match-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;width:100%}.c-match-column{display:flex;flex-direction:column;gap:14px}.c-match{position:relative;display:flex;justify-content:center;align-items:center;min-height:62px;border:1px solid #587186;border-radius:10px;background:#232d36;padding:14px 9px}.c-match .c-option-math{font-size:23px}.c-match[aria-pressed=true]{outline:var(--layout-keyboard-focus-outline-px) solid #38bdf8}.c-match.c-paired{border-color:#61badf;background:#213b4d}.c-pair-tag{position:absolute;top:3px;right:7px;font-size:10px;color:#bde9ff}
.c-fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(94px,1fr));gap:12px;width:100%;max-width:460px}.c-field{display:flex;flex-direction:column;gap:7px;min-width:0}.c-field>span{font-size:12px;color:#c9d9e4}.c-field input,.c-field select{width:100%;min-width:0;height:44px;background:#222d37;border:1px solid #607b90;border-radius:8px;color:#f4f8fb;padding:8px 10px;font-size:19px}.c-field small{font-size:12px;color:#b5c7d5}.c-input-guide{font-size:11px;color:#b5c7d5;margin-bottom:-6px}.c-keypad{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;width:100%;max-width:318px}.c-keypad button{height:44px;border:1px solid #47647b;border-radius:7px;background:#233440;font-size:19px}.c-keypad button:last-child{grid-column:span 2}.c-keypad-expression{grid-template-columns:repeat(7,1fr);max-width:460px}.c-keypad-expression button{font-size:18px}.c-keypad-expression button:last-child{grid-column:auto}.c-input-preview{min-height:38px;font-size:23px;width:100%;text-align:center;overflow:auto}.c-input-preview:empty{display:none}
.c-order-answer,.c-order-options{display:flex;flex-wrap:wrap;gap:10px;width:100%;justify-content:center}.c-order-answer{min-height:88px;border:1px dashed #647d90;padding:12px;border-radius:12px;align-items:center}.c-order-answer>span{font-size:13px;color:#adc0ce}.c-order-answer button,.c-order-options button{position:relative;border:1px solid #60788b;border-radius:9px;padding:13px;min-width:44px;min-height:56px;background:#233440}.c-order-answer small{display:block;font-size:10px;color:#8ed5f4}.c-order-options button:disabled{opacity:.25}
.c-factor-layout{display:flex;gap:18px;align-items:center;max-width:100%}.c-factor-fraction{display:flex;flex-direction:column;gap:10px}.c-factor-row{display:flex;gap:4px;align-items:center;justify-content:center}.c-factor-row:first-child{padding:0 8px 10px;border-bottom:1px solid #c2d0da}.c-factor{width:43px;height:44px;border:1px solid #6f899d;border-radius:9px;background:#274154;font-size:22px}.c-factor[aria-pressed=true]{outline:var(--layout-keyboard-focus-outline-px) solid #38bdf8}.c-factor-times{font-size:14px}.c-factor-audit{display:flex;flex-direction:column;gap:6px;font-size:12px}.c-factor-audit>.c-factor-pair{border:1px solid #415c72;border-radius:7px;padding:3px}
.c-footer{display:grid;grid-template-rows:34px minmax(60px,auto) 52px;gap:9px}.c-utilities{display:flex;justify-content:space-between;align-items:center;gap:9px}.c-utilities button{font-size:11px;min-height:34px;color:#b7d3e6;padding:0}.c-utilities button:disabled{color:#778997}.c-feedback{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:12px;line-height:1.45}.c-feedback strong,.c-feedback span{display:block}.c-feedback strong{margin-bottom:3px}.c-feedback.c-correct{border-left:2px solid #9bceb0;padding-left:10px}.c-correct strong{color:#9bceb0}.c-feedback.c-wrong{border-left:2px solid #dea0a8;padding-left:10px}.c-wrong strong{color:#dea0a8}.c-feedback.c-format{border-left:2px solid #84bcd7;padding-left:10px}.c-why{font-size:11px;flex-shrink:0;border:1px solid #57758a;border-radius:8px;padding:10px}.c-check{width:100%;font-size:16px}
.c-help{position:absolute;bottom:var(--support-bottom,175px);right:20px;left:20px;max-width:470px;margin-left:auto;background:#25323d;border:1px solid #7892a4;border-radius:13px;box-shadow:0 10px 35px #0008;z-index:5}.c-help header{display:flex;align-items:center;padding:8px 14px;border-bottom:1px solid #4d6373;font-size:14px}.c-help header strong{flex:1}.c-help header button{min-height:36px;min-width:36px;font-size:22px}.c-help-body{padding:17px;max-height:300px;overflow:auto;font-size:14px;line-height:1.65}.c-help-body .secondary{margin-top:15px;width:100%;min-height:42px;font-size:13px}.c-help-minimized .c-help-body{display:none}.c-support-math{font-size:24px;text-align:center;margin:15px 0;overflow:auto}.c-dialog{max-width:600px;width:calc(100% - 32px);max-height:86svh;border:1px solid #668095;background:#202b35;color:#f3f6fa;border-radius:16px;padding:26px;overflow:auto}.c-dialog::backdrop{background:#000a}.c-dialog h2{margin-right:32px;margin-bottom:20px;font-size:23px}.c-dialog h3{font-size:16px;margin:18px 0 8px}.c-dialog p,.c-dialog li{font-size:14px;line-height:1.7}.c-dialog p+p{margin-top:12px}.c-dialog-close{position:absolute;right:10px;top:8px;min-width:44px;min-height:44px;font-size:25px}.c-storage-warning{padding:12px;color:#cbd8e2;font-size:12px}
@media(max-width:900px){.c-card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.c-review-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.c-catalog,.c-journey{padding:28px var(--layout-mobile-gutter-px) 45px}.c-page-title h1{font-size:27px}.c-page-title p{font-size:14px}.c-group-toggle{font-size:21px;min-height:86px;padding:18px}.c-card-grid{grid-template-columns:1fr;padding:14px;gap:14px}.c-card{padding:18px}.c-card h2{font-size:15px}.c-card-math{font-size:26px;min-height:76px}.c-review-grid{grid-template-columns:1fr}.c-question h1{font-size:var(--type-mobile-heading-px)}.c-lesson{gap:12px;grid-template-rows:auto minmax(270px,1fr) auto;padding-top:7px}.c-arena{gap:14px;padding-bottom:10px}.c-stimulus{font-size:29px}.c-match-grid{gap:18px}.c-match .c-option-math{font-size:20px}.c-keypad{max-width:310px}.c-keypad-expression{max-width:100%}.c-option{font-size:14px;padding:14px}.c-option[aria-pressed=true]{padding:13px}.c-footer{gap:8px}.c-utilities button{font-size:10px}.c-feedback{font-size:11px}.c-multi{min-height:108px}.c-journey h1{font-size:23px}}
@media(prefers-reduced-motion:reduce){.c-group-panel,.c-chevron{transition:none!important;animation:none!important}}

.c-field>span:first-child{font-size:12px;color:#c9d9e4}.c-field-math{font-size:20px;min-height:30px;display:flex;align-items:center;max-width:100%;overflow:auto}
.c-select-field{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;width:100%;min-height:44px;border:1px solid #607b90;border-radius:8px;background:#222d37;padding:8px 6px;font-size:12px;line-height:1.4;text-align:center}.c-select-field .c-option-math{font-size:20px}.c-select-options{display:flex;flex-direction:column;gap:10px}.c-select-options button{display:flex;align-items:center;justify-content:center;gap:12px;min-height:56px;border:1px solid #647f92;border-radius:9px;padding:13px;font-size:15px}.c-select-options button[aria-selected=true]{background:#19384b;border-color:#38bdf8}
.c-keypad button[data-token="0"]:last-child{grid-column:auto}

.c-reflection{width:100%;max-width:460px}.c-reflection label{font-size:13px;color:#c0d0dc}.c-reflection textarea{display:block;width:100%;height:130px;resize:vertical;margin:10px 0;background:#222d37;border:1px solid #668297;border-radius:9px;color:#f3f6fa;padding:12px;font:15px/1.6 var(--font)}

.c-fields{align-items:end}.c-field-math{height:44px;flex-shrink:0}
.c-select-field{flex-direction:row;flex-wrap:wrap}.c-select-field:disabled,.c-field input:disabled{color:#f3f5f7;opacity:1;-webkit-text-fill-color:#f3f5f7}
.c-keypad-rational{grid-template-columns:repeat(5,1fr)}.c-keypad-rational button:last-child{grid-column:auto}
.c-keypad-expression{gap:5px}
@media(max-width:600px){.c-lesson{gap:8px}.c-arena{gap:10px}.c-stimulus{font-size:var(--type-math-base-px)}}

.c-model-open,.c-extra-practice{min-height:44px;font-size:12px;text-decoration:underline;color:#b5def2;padding:6px 14px}
.c-model-svg{width:100%;max-height:250px;display:block;fill:none;stroke:#a6c8db;stroke-width:1.5}
.c-model-svg text{fill:#e7f3fa;stroke:none;font:13px system-ui,sans-serif}
.model-square{fill:#23475e;stroke:#8ecee9;stroke-width:2}.model-grid{stroke:#79a0b6;stroke-width:1}
.model-perimeter{stroke:#d2ecfa;stroke-width:4}.model-track{stroke-width:2}
.model-segment{fill:#265875;stroke:#8dcee9}.model-over{fill:#5a333b;stroke:#dea0a8}.model-bound{stroke:#ead8ad;stroke-dasharray:4 3}.model-interval{fill:#29506a;stroke:none}.model-point{fill:#8de0ff;stroke:none}
.c-model-content>p{margin:12px 0;text-align:center}.c-model-equation{text-align:center;font-size:22px;line-height:1.8;overflow:auto}
.c-model-controls{display:flex;justify-content:center;align-items:center;gap:20px}
.c-model-controls button{min-width:44px;min-height:44px;border:1px solid #57758a;border-radius:8px;font-size:22px}
.c-model-actions{display:flex;gap:12px;align-items:center;margin-top:20px}.c-model-actions button{min-height:44px;font-size:12px;padding:8px;flex:1}.c-model-actions [hidden]{display:none}
.c-model-solution{padding:16px 0 0;margin-top:16px;border-top:1px solid #4d6373}.c-model-solution .c-support-math{font-size:20px}
.c-variant-list{display:grid;gap:12px;margin-top:18px}.c-variant-list button{padding:14px;min-height:60px;border:1px solid #527188;border-radius:10px;text-align:left;font-size:14px}.c-variant-list .c-support-math{display:block;margin:12px 0 0;font-size:23px}

.c-option-content{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;min-width:0;max-width:100%;width:100%}
.c-option .c-option-content{align-items:flex-start;flex:1}.c-multi .c-option-content{align-items:center}
.c-option-math{display:block;min-width:0;max-width:100%;overflow-x:auto;padding:2px 0}
.c-option-content>span:not(.c-option-math){min-width:0;max-width:100%;overflow-wrap:break-word}
.c-select-field .c-option-content{width:auto;flex:1}

.c-dialog>.c-dialog-close{position:sticky;top:0;float:right;margin:-16px -16px 0 0;background:#202b35;z-index:3;border-radius:50%}

.c-stimulus .math-notation,.c-option-math .math-notation,.c-card-math .math-notation,.c-journey-formula .math-notation,.c-support-math .math-notation,.c-field-math .math-notation,.c-model-equation .math-notation{max-width:none;white-space:nowrap}
.c-field-math:empty{display:none}

/* r6: shared math surfaces never style KaTeX descendants as cards. */
.c-factor-layout{gap:20px;max-width:100%;align-items:center}
.c-factor{width:44px;min-width:44px;height:44px;flex:none}
.c-factor-times{flex:none}.c-factor-row{min-height:44px}
.c-factor-audit{flex-shrink:0;gap:8px}.c-factor-audit:empty{display:none}
.c-factor-audit>.c-factor-pair{display:flex;align-items:center;justify-content:center;min-width:64px;min-height:44px;padding:8px 10px;border:1px solid #415c72;border-radius:9px;background:#202e39;font-size:18px}
.challenge-route{height:100dvh;overflow:hidden}
.c-lesson{height:calc(100dvh - 92px);min-height:0;max-width:700px;display:grid;grid-template-rows:minmax(0,1fr) auto;gap:0;padding:0 var(--layout-mobile-gutter-px) 12px;overflow:hidden}
.c-lesson-content{min-height:0;overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#526777 transparent;padding:12px 4px 24px;display:flex;flex-direction:column;gap:20px;scroll-padding-block:14px}
.c-question{flex:none}.c-arena{flex:1 0 auto;gap:18px;padding:12px 0 8px}
.c-footer{grid-template-rows:44px auto 52px;gap:9px;border-top:1px solid #303b45;padding-top:8px;background:var(--bg)}
.c-utilities button{font-size:12px;min-height:44px;padding:0 2px}
.c-feedback{font-size:12px;line-height:1.55}.c-feedback:empty{display:none}.c-why{min-height:44px}
.c-check:disabled{background:#2b3741;border-color:#415361;color:#93a8b8}
.c-help{bottom:var(--support-bottom,175px);max-height:calc(100% - var(--support-bottom,175px) - 20px)}.c-help-body{max-height:min(300px,45dvh)}
.c-option:not(.c-multi) .c-option-mark{border-radius:50%}
.c-keypad button{min-width:44px}
.c-keypad{display:flex;flex-direction:column;gap:8px;max-width:318px;min-width:0}
.c-keypad-operators{display:grid;grid-template-columns:repeat(auto-fit,minmax(44px,1fr));gap:6px;width:100%}
.c-keypad-numbers{display:grid;grid-template-columns:repeat(3,minmax(44px,1fr));gap:6px;width:100%}
.c-keypad button:last-child{grid-column:auto}
.c-fields{grid-template-rows:auto auto 44px auto;align-items:stretch;row-gap:5px}
.c-field{display:grid;grid-template-rows:subgrid;grid-row:span 4;gap:5px}
.c-field .c-field-math:empty{min-height:0}
.c-field>span:first-child{grid-row:1}.c-field-math{grid-row:2}
.c-field input,.c-field .c-select-field{grid-row:3}.c-field small{grid-row:4}
.c-help{position:static;inset:auto;flex:none;align-self:center;width:100%;max-width:470px;max-height:none;margin:0}
.c-ai-hint [data-ai-hint-request],.c-demo-samples .secondary{min-height:44px;width:100%;white-space:normal}
.c-demo-samples{margin-top:14px;font-size:13px;line-height:1.6;display:grid;gap:8px}
.c-demo-ack{display:flex;align-items:center;gap:10px;margin:20px 0;min-height:44px;font-size:14px;line-height:1.6}
.c-demo-ack input{width:22px;height:22px;flex:none}
.c-ai-hint [data-ai-hint-status]{margin-top:12px}
.c-startup-link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;margin-top:12px}
.c-option-label{font-size:12px;color:#acbbc7;flex:none}.c-preview-placeholder{font-size:12px;color:#acbbc7}
.c-editorial-focus{font-size:12px;color:#acbbc7;line-height:1.6}
.c-place-table{width:100%;border-collapse:collapse;table-layout:fixed;margin:12px 0;font-size:13px;text-align:center}.c-place-table caption{text-align:left;color:#c9d9e4;margin-bottom:8px}.c-place-table th,.c-place-table td{border:1px solid #425564;padding:8px 2px;overflow-wrap:anywhere}.c-place-table th{font-weight:normal;color:#91d4f2}.c-compensation{display:grid;grid-template-columns:1fr auto 1fr;gap:8px;text-align:center;align-items:center}.c-compensation p{background:var(--color-accordion);padding:12px;border-radius:8px;font-size:13px}.c-compensation strong{display:block}
@media(max-width:600px){
 .c-lesson{padding:0 calc(var(--layout-mobile-gutter-px) - 4px) max(12px,env(safe-area-inset-bottom));height:calc(100dvh - 92px)}
 .c-lesson-content{padding:10px 4px 22px;gap:14px}
 .c-arena{gap:14px}
 .c-factor-layout{flex-direction:column;gap:12px}
 .c-factor-audit{flex-direction:row;flex-wrap:wrap;justify-content:center;max-width:100%}
 .c-factor-row{gap:3px}.c-factor-row:first-child{padding-inline:4px}
 .c-factor-audit>.c-factor-pair{min-height:42px;font-size:17px;padding:6px 9px}
 .c-utilities button{font-size:11px}.c-footer{gap:8px}
}
@media(max-height:650px){.c-progress-wrap{height:38px;padding-block:8px}.c-lesson{height:calc(100dvh - 82px)}}

/* r6 product entry; retains the neutral dark surfaces and cyan action. */
.c-header{height:68px;padding-inline:max(24px,calc((100% - 1100px)/2));gap:20px}
.c-brand{font-size:22px;letter-spacing:-.65px;font-weight:700}
.c-header nav{display:flex;gap:6px;align-items:center}.c-header nav a{padding:10px 14px;min-height:44px;display:flex;align-items:center;font-size:13px;color:#aabecb;border-radius:8px}
.c-header nav a:hover,.c-header nav a[aria-current=page]{background:#26333e;color:#eef6fa}
.c-home{max-width:1100px;margin:auto;padding:64px 24px 72px}
.c-home-hero{display:grid;grid-template-columns:1.2fr 1fr;gap:70px;align-items:center}
.c-eyebrow{font-size:10px;line-height:1.6;letter-spacing:1.7px;font-weight:650;color:#91c7e0}
.c-home-intro h1{font-size:56px;line-height:1.08;font-weight:680;letter-spacing:-1.8px;margin:20px 0 24px;max-width:590px}
.c-home-lead{font-size:18px;line-height:1.75;color:#becbd5;max-width:550px}
.c-home-actions{display:flex;gap:20px;align-items:center;margin-top:30px;flex-wrap:wrap}
.c-home-actions .primary{min-width:180px}.c-home-text-link{font-size:13px;color:#c7d7e2;min-height:44px;display:flex;align-items:center;gap:12px}
.c-home-note,.c-resume-caption{font-size:12px;line-height:1.7;color:#96adbd;margin-top:18px;max-width:510px}
.c-home-example{border:1px solid #465d6e;background:#1e2a34;border-radius:20px;padding:30px;text-align:center}
.c-home-example>small{font-size:10px;letter-spacing:1.2px;color:#a8c2d2}.c-home-math{font-size:34px;margin:26px 0}
.c-home-tiles{display:grid;grid-template-columns:repeat(3,40px);gap:7px;justify-content:center;margin:0 auto 24px}
.c-home-tiles>span{width:40px;height:40px;border:1px solid #75b2d0;background:#294d63;border-radius:7px}
.c-home-example p{font-size:13px;line-height:1.8;color:#b6cad7}.c-home-example>a{display:inline-block;margin-top:24px;font-size:13px;color:#c7e9fa;text-decoration:underline;text-underline-offset:5px}
.c-home-topics{margin-top:80px}.c-section-heading{display:flex;justify-content:space-between;align-items:end;gap:32px;margin-bottom:24px}
.c-section-heading h2,.c-home-method h2{font-size:29px;line-height:1.25;letter-spacing:-.6px;margin-top:12px}
.c-section-heading>p{font-size:13px;line-height:1.7;color:#aebfc9;max-width:245px}
.c-topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.c-topic{padding:25px 23px;border:1px solid #3d5262;border-radius:15px;background:#1e272f;display:flex;flex-direction:column;gap:14px;transition:border-color 150ms ease,background 150ms ease}
.c-topic:hover{background:#233440;border-color:#76bada}.c-topic-number{font-size:12px;color:#91c7e0}.c-topic h3{font-size:20px;line-height:1.3}
.c-topic>p{font-size:14px;line-height:1.75;color:#b4c4cf}.c-topic-link{display:flex;justify-content:space-between;gap:14px;font-size:12px;color:#c8dfea;margin-top:auto;padding-top:8px}
.c-home-method{display:grid;grid-template-columns:1fr 1fr;gap:80px;margin-top:74px;padding-top:48px;border-top:1px solid #364550}
.c-home-method>div>p:last-child{font-size:15px;line-height:1.8;color:#b4c4cf;margin-top:20px}.c-home-method ol{list-style:none;margin:0;padding:0;display:grid;gap:26px}
.c-home-method li{display:flex;gap:18px}.c-home-method li>span{min-width:34px;height:34px;border:1px solid #536d80;border-radius:50%;display:grid;place-items:center;font-size:12px;color:#b7d8eb}
.c-home-method h3{font-size:16px;margin-bottom:7px}.c-home-method li p{font-size:13px;color:#acbecb;line-height:1.75}
.c-home-status{margin-top:66px;border-radius:15px;background:#202e39;border:1px solid #405869;padding:26px 30px}
.c-home-status h2{font-size:19px;margin-bottom:12px}.c-home-status p{font-size:14px;line-height:1.8;color:#bccbd5;max-width:800px}.c-home-status a{display:inline-block;font-size:13px;margin-top:18px;text-decoration:underline;text-underline-offset:5px;color:#c8e8f8}
.c-site-footer{max-width:1100px;margin:auto;border-top:1px solid #364550;padding:26px 24px 35px;display:flex;justify-content:space-between;align-items:center;color:#c6d4df;font-size:15px}
.c-site-footer small{display:block;font-size:11px;color:#8fa5b5;margin-top:5px}.c-site-footer a{font-size:12px;color:#aebfcb;min-height:44px;display:flex;align-items:center}
.c-about{max-width:740px;margin:auto;padding:48px 24px 70px}.c-about h1{font-size:36px;line-height:1.2;margin:14px 0 24px}.c-about section{padding-top:28px;margin-top:28px;border-top:1px solid #364550}.c-about section h2{font-size:20px;margin-bottom:12px}.c-about section p{font-size:15px;color:#b4c4cf;line-height:1.85}.c-about>.primary{margin-top:36px;max-width:300px}
.c-focus-brand{color:#d7e6ef;font-size:15px;font-weight:650;letter-spacing:-.25px}.c-focus-header>span{font-size:11px;margin-left:14px;margin-right:auto;color:#96adbd}
@media(max-width:800px){.c-home-hero{gap:32px}.c-home-intro h1{font-size:43px}.c-home-method{gap:38px}.c-topic-grid{gap:12px}.c-topic{padding:20px}}
@media(max-width:600px){
 .c-header{height:64px;padding-inline:20px;gap:10px}.c-brand{font-size:20px}
 .c-header nav{gap:0}.c-header nav a{font-size:11px;padding-inline:8px}
 .c-home{padding:35px 20px 44px}.c-home-hero{grid-template-columns:1fr;gap:32px}
 .c-home-intro h1{font-size:39px;line-height:1.12;letter-spacing:-1.1px;margin-block:16px 20px}
 .c-home-lead{font-size:16px;line-height:1.8}.c-home-actions{gap:12px;margin-top:24px}
 .c-home-actions .primary{flex:1;min-width:175px}.c-home-actions .secondary{width:100%;text-align:center}
 .c-home-text-link{font-size:12px}.c-home-example{padding:25px;border-radius:16px}
 .c-home-topics{margin-top:45px}.c-section-heading{display:block}.c-section-heading h2,.c-home-method h2{font-size:26px}.c-section-heading>p{max-width:none;margin-top:14px}
 .c-topic-grid{grid-template-columns:1fr;gap:12px}.c-topic{padding:22px}
 .c-home-method{grid-template-columns:1fr;gap:28px;margin-top:44px;padding-top:32px}
 .c-home-status{margin-top:40px;padding:22px}.c-home-status h2{font-size:18px}
 .c-site-footer{padding-inline:20px}.c-about{padding-top:30px}.c-about h1{font-size:30px}
}
@media(prefers-reduced-motion:reduce){.c-topic{transition:none}}

/* Explicit rows retain the action position when feedback is empty. */
.c-utilities{grid-row:1}.c-feedback{grid-row:2}.c-check{grid-row:3}
.c-factor-row:has(>.c-factor-one){min-height:28px}.c-factor-one{font-size:20px}

/* One matching grid keeps both columns and every row geometrically identical. */
.c-match-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-auto-rows:var(--layout-matching-desktop-height-px);gap:12px;width:100%;max-width:600px}
.c-match{position:relative;display:grid;place-items:center;width:100%;height:100%;min-width:0;min-height:0;padding:18px 24px 18px 12px;border:2px solid #425564;transform:none;overflow:visible}
.c-match:hover,.c-match:active,.c-match[aria-pressed=true],.c-match.c-paired{transform:none;padding:18px 24px 18px 12px;border-width:2px}
.c-match .c-option-content{display:grid;place-items:center;min-width:0;max-width:100%;gap:8px}
.c-match .c-option-math{font-size:23px;max-width:100%;overflow:visible}
.c-match .c-pair-tag{position:absolute;right:5px;top:5px;margin:0;width:18px;height:18px;font-size:10px}
.c-match[aria-pressed=true]{border-color:#42c5f4;background:#193d51}
.c-match:focus-visible{outline:var(--layout-keyboard-focus-outline-px) solid #beeafe;outline-offset:3px}
.c-sequence-label{font-size:11px;color:#b5dced;line-height:1.6;margin:0 0 10px}
.c-sequence-start{margin-top:18px}.c-sequence-note{font-size:12px;line-height:1.7;color:#bdd0dc}
@media(max-width:600px){.c-match-grid{gap:10px;grid-auto-rows:var(--layout-matching-mobile-height-px)}.c-match .c-option-math{font-size:var(--type-matching-mobile-base-px)}}

.c-match:disabled{opacity:1;color:#eef5fa;-webkit-text-fill-color:#eef5fa;cursor:default}

/* Selection uses reserved borders and an inset ring; geometry stays unchanged. */
.c-option,.c-option[aria-pressed=true],.c-option[aria-checked=true]{border-width:var(--layout-selection-border-px);padding:14px 16px;transform:none}
.c-option[aria-pressed=true],.c-option[aria-checked=true],.c-match.c-paired,.c-match[aria-pressed=true]{border-color:#46cafa;box-shadow:inset 0 0 0 var(--layout-selection-inset-ring-px) var(--color-selection)}
.c-option:focus-visible,.c-match:focus-visible{outline:var(--layout-keyboard-focus-outline-px) solid #f2f8fc;outline-offset:3px}
.c-match,.c-match:hover,.c-match:active,.c-match[aria-pressed=true],.c-match.c-paired{border-width:var(--layout-selection-border-px);padding:17px 23px 17px 11px}
.c-focus-header .c-sound{min-height:36px;min-width:84px;font-size:10px;margin-right:7px;border:1px solid #506574;border-radius:8px;padding:6px}
.c-focus-header .c-sound[aria-pressed=false]{color:#9daeba}

.c-question>.c-sequence-label{font-size:11px;line-height:1.6}.c-question:has(.c-sequence-label)>small{display:none}
@media(max-width:600px){.c-match-grid{grid-auto-rows:var(--layout-matching-mobile-height-px)}}

/* Measure available card space rather than the formula's own intrinsic width. */
.c-match,.c-match:hover,.c-match:active,.c-match[aria-pressed=true],.c-match.c-paired{padding:16px 8px}
.c-match .c-option-content,.c-match .c-option-math{width:100%;text-align:center}
/* Authored Phase A preview: task quantities remain visible and countable. */
.c-unit-draft-note{font-size:12px;line-height:1.5;color:#bdd7e9;margin:0 0 10px}.c-unit-preview-list{margin:24px 0}.c-unit-preview-list>a{display:flex;align-items:center;min-height:44px;margin:10px 0;padding:10px 14px;text-align:left}
.c-primary-visual{width:100%;max-width:440px;margin:0;padding:14px;border:1px solid #4b6375;border-radius:12px;background:#1d2831;box-sizing:border-box}.c-primary-visual figcaption{font-size:12px;line-height:1.6;margin:10px 0 0;color:#c4d7e4}.c-primary-visual p{font-size:13px;line-height:1.6}
.c-primary-objects{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px;justify-items:center;padding:20px;min-height:90px}.c-primary-object{display:grid;place-items:center;width:28px;height:28px;border:2px solid #b8d8ed;border-radius:50%;background:#3c617a}.c-primary-object small{color:#fff;font-size:13px}.c-primary-scattered .c-primary-object:nth-child(3n+1){transform:translate(-3px,3px)}.c-primary-scattered .c-primary-object:nth-child(3n+2){transform:translate(3px,-3px)}.c-primary-objects>p{grid-column:1/-1}
.c-primary-line svg{display:block;width:100%;height:auto;fill:#a5d7f5;overflow:visible}.c-primary-line path{stroke:#9abed5;stroke-width:1.5;fill:none}.c-primary-line text{fill:#eef6fa;font-size:16px}
.c-primary-bundles{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;padding:6px 0 12px}.c-primary-bundle{display:inline-flex;border:2px solid #9dc9e5;border-radius:6px;padding:4px;background:#284457}.c-primary-bundle>span{display:grid;gap:3px}.c-primary-bundle i{display:block;width:12px;height:5px;background:#c3e0f1;border-radius:2px}.c-primary-loose{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;padding:8px}.c-primary-loose>[data-primary-loose]{display:block;width:18px;height:18px;background:#9dcced;border:1px solid #e1f1fa;border-radius:50%}.c-primary-hundred>.c-primary-bundles{border:2px solid #a0c0d7;border-radius:10px;padding:10px}
.c-primary-exchange{display:grid;grid-template-columns:48px 24px minmax(0,1fr);align-items:center;gap:8px}.c-primary-exchange>figcaption{grid-column:1/-1}.c-primary-name-path ol{list-style:none;padding:0;margin:0 0 12px;display:grid;gap:5px}.c-primary-name-path li{display:grid;grid-template-columns:34px minmax(0,1fr);gap:8px;font-size:14px;line-height:1.6}.c-primary-name-path strong{color:#a7d3ee}
.c-primary-lid-task h2{font-size:12px;line-height:1.5;margin:0 0 8px}.c-primary-glasses{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;padding:8px}.c-primary-glass{display:block;width:20px;height:24px;border:2px solid #c1ddec;border-radius:2px 2px 6px 6px;background:#324e63}.c-primary-trays{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px;margin-top:14px}.c-primary-trays>section{padding:8px 4px;border:1px solid #708b9d;border-radius:6px}.c-primary-trays [role=group]{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));justify-items:center;gap:8px 4px}.c-primary-lid{display:block;width:16px;height:16px;border:2px solid #cce6f5;background:#46708b;border-radius:50%}
/* At 320px retain the readable math minimum inside both reserved borders. */
@media(max-width:340px){.c-match,.c-match:hover,.c-match:active,.c-match[aria-pressed=true],.c-match.c-paired{padding-inline:0}}
.c-curriculum{max-width:var(--layout-catalog-max-px);margin:32px auto;padding:0 var(--layout-mobile-gutter-px) 64px;color:var(--color-text)}
.c-curriculum h1{margin:24px 0 16px}.c-curriculum>p{line-height:1.6;max-width:900px}
.c-curriculum-note{padding:16px;border:1px solid var(--color-line);border-radius:12px;color:var(--color-muted)}
.c-curriculum-level{margin-top:16px;border:1px solid var(--color-line);border-radius:12px;background:var(--color-card)}
.c-curriculum summary{cursor:pointer;min-height:48px;padding:14px 16px;overflow-wrap:anywhere}
.c-curriculum-level>summary{font-size:20px;font-weight:600}
.c-curriculum summary:focus-visible,.c-curriculum-missions a:focus-visible{outline:var(--layout-keyboard-focus-outline-px) solid var(--color-selection);outline-offset:3px}
.c-curriculum-phase{padding:0 16px 16px}.c-curriculum-phase h2{font-size:16px;margin:20px 0 12px;color:var(--color-muted)}
.c-curriculum-family{margin:8px 0;border-top:1px solid var(--color-line)}
.c-curriculum-family summary{font-weight:600;padding-left:0}.c-curriculum-family summary small{display:block;font-weight:400;margin:6px 0 0 18px;color:var(--color-muted)}
.c-curriculum-family article{padding:4px 0 16px}.c-curriculum-family h3{font-size:16px;margin:8px 0}
.c-curriculum-family ul{list-style:none;margin:0;padding:0}.c-curriculum-family li{padding:12px 0;border-top:1px solid var(--color-line)}
.c-curriculum-family li strong{font-weight:500;overflow-wrap:anywhere}.c-curriculum-status{display:block;font-size:12px;color:var(--color-muted);margin-top:6px}
.c-curriculum-family .c-small{margin:8px 0;overflow-wrap:anywhere}
.c-curriculum-missions{display:grid;gap:8px;margin-top:12px}.c-curriculum-missions a{display:flex;align-items:center;min-height:44px;padding:10px 12px;border:1px solid var(--color-line);border-radius:8px;color:var(--color-selection);overflow-wrap:anywhere}

/* The prompt token applies to the lesson prompt; editorial step labels retain their smaller hierarchy. */
@media(max-width:600px){.c-question>p:not(.c-sequence-label){font-size:var(--type-mobile-prompt-px)}}

/* Concrete operations: every source object stays visible before the action. */
.c-operation-visual{display:grid;gap:16px;margin:16px 0}
.c-operation-visual section{border:1px solid var(--color-border,#405263);border-radius:12px;padding:12px;min-width:0}
.c-operation-visual h2{font-size:16px;margin:0 0 12px;font-weight:500}
.c-operation-objects{display:grid;grid-template-columns:repeat(auto-fit,32px);gap:14px;min-width:0}
.c-operation-object{position:relative;width:32px;height:40px;display:grid;place-items:center}
.c-operation-object i{display:block;width:22px;height:22px;border:2px solid currentColor;border-radius:50%;background:transparent}
.c-operation-triangle i{border:0;border-radius:0;width:24px;height:24px;clip-path:polygon(50% 0,100% 100%,0 100%);background:currentColor}
.c-operation-leaving{outline:1px dashed currentColor;border-radius:5px}
.c-operation-leaving b{position:absolute;right:-4px;top:-8px;font-size:17px;line-height:1;font-weight:400}
.c-operation-scattered .c-operation-object:nth-child(3n+1){transform:translateY(4px)}
.c-operation-visual figcaption{font-size:14px;line-height:1.5;color:var(--color-text-muted,#a9b8c5)}
.c-entry-support{display:block;font-size:14px;padding:8px;min-height:44px;box-sizing:border-box;text-decoration:underline}

.c-operation-arrow{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.7;display:block}

.c-pattern-stimulus{margin:18px 0}
.c-pattern-strip,.c-pattern-response{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:12px 0}
.c-pattern-model-tile,.c-pattern-placeholder,.c-pattern-response button{min-width:0;min-height:92px;border:1px solid var(--color-border,#405263);border-radius:8px;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:8px 2px;gap:4px}
.c-pattern-model-tile{background:transparent}
.c-pattern-unit-start{border-left:4px solid currentColor}
.c-pattern-stimulus svg,.c-pattern-builder svg{width:32px;height:32px;fill:none;stroke:currentColor;stroke-width:2;display:block}
.c-pattern-model-tile span,.c-pattern-builder button span{font-size:13px;line-height:1.4;overflow-wrap:anywhere}
.c-pattern-model-tile small,.c-pattern-response small{font-size:12px;line-height:1.4}
.c-pattern-placeholder{opacity:.6;border-style:dashed;font-size:13px}
.c-pattern-builder h2{font-size:16px;font-weight:500;margin:18px 0 0}
.c-pattern-palette{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:18px 0}
.c-pattern-palette button{min-height:76px;display:flex;align-items:center;justify-content:center;gap:12px;padding:10px;min-width:0}
.c-pattern-actions{display:flex;gap:10px;flex-wrap:wrap}
.c-pattern-actions button{min-height:44px;padding:10px;font-size:14px;flex:1 1 110px}
@media(min-width:700px){.c-pattern-strip,.c-pattern-response{grid-template-columns:repeat(6,minmax(0,1fr))}}

/* Fraction diagrams share a physical scale and keep all marks inside their SVG. */
.c-fraction-visual{margin:0;display:grid;gap:var(--space-3,12px);width:100%;min-width:0}
.c-fraction-panels{display:grid;grid-template-columns:1fr;gap:14px;min-width:0}
.c-fraction-panel{min-width:0;width:100%;max-width:360px;justify-self:start}
.c-fraction-panel h2,.c-fraction-collection h2,.c-fraction-recipients h2{font-size:1rem;line-height:1.45;margin:0 0 8px}
.c-fraction-panel svg{display:block;width:100%;height:auto;overflow:hidden}
.c-fraction-panel svg text{font-family:inherit;font-size:22px;fill:var(--color-text);font-weight:600}
.c-fraction-region{fill:var(--color-card);stroke:var(--color-text);stroke-width:2}
.c-fraction-cell{fill:none;stroke:var(--color-muted);stroke-width:.55;pointer-events:none}
.c-fraction-whole{fill:none;stroke:var(--color-text);stroke-width:2.5;pointer-events:none}
.c-fraction-panel pattern rect{fill:var(--color-accordion)}
.c-fraction-panel pattern path{stroke:var(--color-selection);stroke-width:2}
.c-fraction-collection{border:2px solid var(--color-muted);border-radius:10px;padding:10px;display:grid;gap:10px;min-width:0}
.c-fraction-group{border:2px solid var(--color-line);border-radius:8px;padding:8px;min-width:0}
.c-fraction-group-selected{border-color:var(--color-selection);background:var(--color-accordion)}
.c-fraction-group h3{font-size:1rem;margin:0 0 8px}
.c-fraction-objects{display:flex;flex-wrap:wrap;gap:10px;min-width:0}
.c-fraction-object{display:block;width:28px;height:28px;border:2px solid var(--color-text);border-radius:50%;background:var(--color-card);position:relative;flex:none}
.c-fraction-object:before,.c-fraction-object:after{content:'';position:absolute;top:9px;width:3px;height:3px;background:var(--color-text);border-radius:50%}
.c-fraction-object:before{left:6px}.c-fraction-object:after{right:6px}
.c-fraction-lunchbox{width:38px;height:30px;border-radius:6px}
.c-fraction-lunchbox:before{width:12px;height:5px;left:10px;top:-7px;border:2px solid var(--color-text);border-bottom:0;background:none;border-radius:4px 4px 0 0}
.c-fraction-lunchbox:after{width:100%;height:0;left:0;top:9px;border-top:1px solid var(--color-text);background:none}
.c-fraction-recipients{display:flex;gap:12px;flex-wrap:wrap}
.c-fraction-recipients h2{width:100%}.c-fraction-recipients span{border:1px solid var(--color-line);padding:8px;border-radius:6px}
.c-fraction-visual figcaption{font-size:.9rem;line-height:1.5;color:var(--color-muted)}

/* A common physical scale preserves length when strips move or turn. */
.c-length-visual{margin:0;display:grid;gap:12px;min-width:0;width:100%}
.c-length-visual svg{display:block;width:100%;max-width:360px;height:auto;overflow:hidden}
.c-length-visual svg text{font-family:inherit;font-size:18px;fill:var(--color-text)}
.c-length-strip{fill:var(--color-card);stroke:var(--color-text);stroke-width:2}
.c-length-start{fill:var(--color-selection)}
.c-length-origin{fill:none;stroke:var(--color-muted);stroke-width:1.5;stroke-dasharray:4 3}
.c-length-piece{stroke:var(--color-text);stroke-width:1.5}
.c-length-visual pattern path{stroke:var(--color-selection);stroke-width:1.5}
.c-length-controls{display:grid;gap:10px;max-width:360px}
.c-length-controls button,.c-entry-optional button{min-height:44px;padding:10px;white-space:normal}
.c-length-tiles{display:flex;flex-wrap:wrap;gap:14px;padding:14px 0}
.c-length-tile{display:block;width:44px;height:18px;border:2px solid var(--color-text);background:var(--color-card)}
.c-length-views{display:grid;gap:18px;min-width:0}
.c-length-measure-panel{min-width:0;width:100%;max-width:360px}
.c-length-measure-panel h2{font-size:1rem;line-height:1.45;margin:0 0 8px}
.c-length-visual figcaption,.c-length-reports,.c-entry-optional p{font-size:.9rem;line-height:1.5;color:var(--color-muted)}
.c-length-reports strong{color:var(--color-text)}
.c-entry-optional{margin-top:18px;border-top:1px solid var(--color-line);padding-top:12px}

/* P01a.1 count scenes: countable objects stay mounted during semantic movement. */
.c-count-groups svg{display:block;width:100%;height:auto;overflow:visible}.c-count-frame{fill:#19394b;stroke:#8cbdd6;stroke-width:1.2}.c-count-bag-tie{stroke:#bde5f7;stroke-width:2}.c-count-dot{transition:transform 1.6s ease-in-out}.c-count-dot circle{fill:#a7d7ed;stroke:#e2f4fd;stroke-width:1}.c-count-dot text{fill:#122a39;font-size:13px;font-family:Arial,sans-serif}.c-count-total{fill:#dcecf4;font-size:13px}.c-count-groups [data-count-frame]{transition:opacity 1.6s}.c-count-controls{display:flex;flex-wrap:wrap;gap:10px}.c-count-groups button,.c-count-probe button,.c-count-support{min-height:44px}.c-count-probe{padding:10px 0;border-bottom:1px solid #47647b}.c-count-probe h3{font-size:15px;line-height:1.6}.c-count-probe>div{display:flex;gap:10px}.c-count-probe button{min-width:44px}.c-count-probe [role=status]{font-size:14px;line-height:1.6}.c-count-support{margin-top:12px;text-align:left}.c-count-groups [data-count-narration]{min-height:3.2em}.c-count-groups [data-count-move]{width:100%}
@media(prefers-reduced-motion:reduce){.c-count-dot{transition:transform .01s}.c-count-groups [data-count-frame]{transition:none}}

/* Natural-number answer and keypad stay together at the real end of the lesson. */
.c-count-answer{display:flex;flex-direction:column;gap:8px;width:100%;max-width:318px}
.c-count-answer .c-fields{display:block;max-width:none}
.c-count-answer .c-field{display:flex;gap:5px}
.c-count-answer .c-field small:empty{display:none}
.c-count-answer .c-keypad{max-width:none}
.c-count-answer input:focus-visible,.c-count-answer button:focus-visible{outline-offset:-3px}
.c-digit-lesson .c-arena{padding-bottom:0}
.c-digit-lesson .c-lesson-content{padding-bottom:12px}
@media(max-height:650px){
 .c-count-answer{gap:4px}
 .c-count-answer .c-field{gap:0}
 .c-count-answer .c-keypad-numbers{gap:4px}
 .c-digit-lesson .c-lesson-content{padding-bottom:2px}
}

/* Reusable lesson contract v1: opt-in, shared by all recipes; no item selectors. */
[data-component-contract] .c-question,[data-component-contract] .c-arena,
[data-component-contract] .c-option-content,[data-component-contract] .c-field{min-width:0;max-width:100%}
[data-component-contract] .c-question h1,[data-component-contract] .c-question p,
[data-component-contract] .c-option-content>span:not(.c-option-math),
[data-component-contract] .c-field>[id^="label-"]{overflow-wrap:anywhere}
[data-component-contract] .c-stimulus,[data-component-contract] .c-support-math{max-width:100%;overflow:auto;flex-shrink:0;padding-block:8px}
[data-component-contract] .c-stimulus>.math-notation,[data-component-contract] .c-support-math>.math-notation{display:inline-block;min-width:max-content}
[data-component-contract] .c-match-grid{grid-auto-rows:minmax(var(--layout-matching-mobile-height-px),auto)}
[data-component-contract] .c-match{height:auto;min-height:44px}
[data-component-contract] .c-option-content{white-space:normal}
[data-component-contract] .c-count-answer .c-field{display:grid;grid-template-columns:minmax(0,1fr) 92px;align-items:center;gap:4px}
[data-component-contract] .c-count-answer .c-field .c-field-math:empty,
[data-component-contract] .c-count-answer .c-field small:empty{display:none}
[data-component-contract] .c-count-answer .c-field input{width:100%;min-width:0}
@media(max-width:600px){[data-component-contract] .c-multi-grid{grid-template-columns:minmax(0,1fr)}}
[data-component-contract] .c-count-answer .c-field>[id^="label-"]{grid-column:1;grid-row:1}
[data-component-contract] .c-count-answer .c-field input{grid-column:2;grid-row:1}
/* P01a.2: independent collections for written-number names. */
.c-name-model{display:flex;flex-direction:column;gap:20px}.c-name-model [hidden]{display:none}.c-name-model section{width:100%;scroll-margin-top:8px}.c-name-model h2{font-size:16px;margin-bottom:8px}.c-name-objects{display:block;width:100%;height:auto}.c-name-dot circle{fill:#a7d7ed;stroke:#e2f4fd;stroke-width:1}.c-name-pair{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:8px}.c-name-pair strong{font-size:24px}.c-name-pair span{font-size:16px}.c-name-controls,.c-name-tools{display:flex;flex-direction:column;gap:10px;width:100%;max-width:390px}.c-name-controls button,.c-name-tools button{min-height:44px}.c-name-tools p{font-size:12px;line-height:1.5;color:#c9d9e4}.c-name-tools [aria-pressed=true]{border-color:#a7d7ed}.c-name-basics{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.c-name-basics div{display:flex;gap:12px}.c-name-basics dd{margin:0}.c-name-basics dt{min-width:18px;font-weight:bold}