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.answer-choices{margin-top:24px;text-align:left}.answer-choices h2{font-size:15px;margin:0 0 12px}.answer-choice-list{display:grid;grid-template-columns:1fr;gap:10px}.answer-choice{display:flex;align-items:baseline;gap:12px;width:100%;padding:13px 15px!important;text-align:left;white-space:normal;overflow-wrap:anywhere;border:1px solid #cfd9eb!important;background:#f8faff!important;border-radius:8px;color:#233d66}.answer-choice b{flex-shrink:0}.answer-choice:hover{background:#edf2fc!important}.answer-choice.correct{border-color:#278364!important;background:#edf8f2!important}.answer-choice.incorrect{border-color:#bd5656!important;background:#fff1f1!important}.choice-feedback{min-height:22px;margin:12px 0 0;font-size:13px;line-height:1.6;color:#a14141}.choice-feedback.correct{color:#247657}

.correct-celebration{position:fixed;inset:0;z-index:1000;display:grid;place-items:center;background:rgba(24,49,42,.25);pointer-events:all;animation:celebration-fade .15s ease-out}.correct-celebration-card{display:flex;flex-direction:column;align-items:center;gap:12px;padding:34px 54px;border:2px solid #b9e4cd;border-radius:24px;background:#fff;box-shadow:0 20px 65px #183d3433;animation:celebration-pop .45s cubic-bezier(.2,.9,.3,1.3)}.correct-celebration-card strong{font-size:32px;color:#207654}.correct-celebration-card>span:last-child{font-size:14px;color:#526c60}.celebration-check{display:grid;place-items:center;width:76px;height:76px;border-radius:50%;background:#e1f6e9;color:#238158;font-size:48px;font-weight:800;animation:celebration-check .6s ease-out}.answer-choice:disabled{opacity:1;cursor:default}@keyframes celebration-fade{from{opacity:0}to{opacity:1}}@keyframes celebration-pop{from{opacity:0;transform:translateY(20px) scale(.7)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes celebration-check{0%{transform:rotate(-20deg) scale(.4)}65%{transform:rotate(8deg) scale(1.12)}100%{transform:rotate(0) scale(1)}}@media(prefers-reduced-motion:reduce){.correct-celebration,.correct-celebration-card,.celebration-check{animation:none}}

.factor-guide{font-size:14px;line-height:1.8;color:#53647d}.factor-rows{list-style:none;padding:0;margin:18px 0}.factor-rows li{display:flex;gap:20px;align-items:center;margin:6px 0}.factor-rows b{padding:8px 12px;border-right:2px solid #405a96;border-bottom:2px solid #405a96;color:#304f93}.factor-equation{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:18px 12px;background:#f1f5fc;border-radius:8px;font-size:22px;font-weight:700}.factor-equation select{font-size:20px;padding:7px}.factor-product{font-size:22px;font-weight:700;color:#247657}.factor-complete{color:#247657}

.factor-heading{display:flex;justify-content:space-between;align-items:center;margin:14px 0 20px}.factor-heading h3{margin:0;font-size:20px}.factor-heading>span,.factor-label{font-size:13px;color:#7183a5}.factor-current{font-size:34px;font-weight:800;color:#3e56a0;margin:8px 0 22px}.factor-instruction{border-left:3px solid #90a0d1;padding-left:12px;color:#304f93;line-height:1.7}.factor-instruction b{font-size:13px}.factor-instruction p{margin:5px 0 12px}.prime-buttons{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:14px 0 10px}.prime-buttons button{padding:14px 8px!important;font-size:22px;font-weight:750;color:#3e56a0;border:1px solid #a1b1df!important;background:#fff!important;border-radius:8px}.prime-buttons button:hover{background:#edf2ff!important}.factor-tools{display:flex;gap:6px;flex-wrap:wrap}.factor-tools button{font-size:13px;padding:8px 10px!important}.factor-tools button:disabled{opacity:.45}

.factor-result-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin:18px 0}.factor-result-row .factor-product{margin:0}.factor-result-row button{white-space:nowrap}

.classification-results{padding:10px 14px;margin:14px 0 22px;background:#eef6f0;border-left:3px solid #328767;border-radius:4px}.classification-results p{display:flex;gap:14px;flex-wrap:wrap;margin:8px 0;line-height:1.7}.classification-results b{color:#247458;min-width:100px}.reduced-fraction{font-size:26px;font-weight:750;color:#304f93}.classification-work h3{font-size:17px}

.cancel-fraction{margin:18px 0;padding:10px 16px;background:#f6f8fd;border-radius:8px}.cancel-factor-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:12px 0}.cancel-factor-row:first-child{border-bottom:2px solid #6378ac}.cancel-factor-row>b{font-size:13px;color:#536782;margin-right:6px}.cancel-factor{min-width:44px;min-height:44px;font-size:22px;font-weight:750;background:#fff!important;border:1px solid #b8c6e2!important}.cancel-factor.selected{outline:3px solid #5479ca;background:#e4edff!important}.cancel-factor.cancelled{position:relative;color:#8d98aa;background:#edf0f5!important;opacity:1}.cancel-factor.cancelled:after{content:"";position:absolute;left:6px;right:6px;top:50%;height:3px;background:#c44e59;transform:rotate(-40deg)}.factor-times{color:#77859d}

.classification-buttons{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}.classification-buttons .answer-choice{width:auto;justify-content:center;font-weight:700}.classification-buttons button{min-height:46px}

.repeat-fields{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin:18px 0}.repeat-field{display:flex;flex-direction:column;gap:8px;font-size:14px;color:#536782}.repeat-input{width:100px;min-height:48px;padding:8px;border:2px solid #91a7d8;border-radius:7px;font-size:24px;color:#304f93}.repeat-equation{font-size:28px;font-weight:750;color:#304f93;margin:24px 0 12px}.repeat-results p{padding:12px;background:#eef5f1;border-left:3px solid #328767;line-height:1.7}.repeat-field{margin-bottom:16px}

.cancel-factor.cancelled{border-color:#d6b5ba!important;color:#9c656b!important;background:#fff0f2!important}.cancel-factor.cancelled s{text-decoration:none}.cancel-factor.cancelled:after{left:3px;right:3px;height:4px;background:#c73349;transform:rotate(-48deg);pointer-events:none}

.reduction-verdict{padding:18px;margin:18px 0;background:#eef5f1;border-left:3px solid #328767;border-radius:6px}.reduction-verdict>strong{font-size:26px;color:#304f93}.reduction-verdict p{line-height:1.8;margin:12px 0}.reduction-verdict button{margin-top:4px}

.repeat-calculate{margin:0 10px 12px 0;background:#26765b!important}.repeat-calculation{font-size:19px;font-weight:700;line-height:1.6;color:#26765b}.repeat-calculation:empty{display:none}

.repeat-decimal-result{display:flex;flex-direction:column;gap:10px;margin:16px 0 22px;padding:18px;background:#edf6f0;border-left:3px solid #328767;border-radius:6px}.repeat-decimal-result strong{font-size:26px;color:#26765b;overflow-wrap:anywhere}.repeat-decimal-result span{font-size:16px;color:#405d50}

.repeat-expression-row{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:24px 0}.repeat-expression-row .repeat-equation{margin:0}.repeat-decimal-inline{font-size:28px;color:#26765b}.repeat-decimal-inline[hidden]{display:none}.repeat-expression-row button{white-space:nowrap}

.completed-results{margin:16px 0 24px;padding:14px 16px;background:#f0f6f2;border:1px solid #d5e5dc;border-left:4px solid #328767;border-radius:7px}.completed-results h3{margin:0 0 10px;font-size:14px;color:#287457}.completed-results ol{list-style:none;margin:0;padding:0}.completed-results li{padding:9px 0;border-top:1px solid #dce8e0}.completed-results li:first-child{border-top:0;padding-top:0}.completed-results li:last-child{padding-bottom:0}.completed-results li>b{font-size:12px;color:#607b6d}.completed-results li>p{margin:4px 0 0;font-size:16px;font-weight:650;line-height:1.7;color:#254636;overflow-wrap:anywhere}

.step-task,.step-detail p,.current-expression,.history li>p{white-space:pre-line}

.shift-buttons{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:20px 0}.shift-buttons button{padding:16px 8px!important;font-size:22px;font-weight:750}.shift-buttons button.selected{background:#e6edff!important;border:2px solid #4b66ad!important;color:#304f93}.shift-preview p{font-size:21px;font-weight:700;line-height:1.8;color:#304f93;margin:8px 0;overflow-wrap:anywhere}

.shift-result{display:flex;align-items:center;gap:12px;width:100%;padding:14px!important;margin:10px 0;text-align:left;font-size:20px;font-weight:700;line-height:1.6;background:#f6f8fd!important;overflow-wrap:anywhere}.shift-result.selected{border:2px solid #4b66ad!important;background:#e6edff!important;color:#304f93}.shift-selection{flex-shrink:0}.shift-result:disabled{opacity:1;color:#425777;cursor:default}.shift-buttons button:disabled{opacity:.55;cursor:default}

.shift-buttons{display:flex;gap:8px;margin:12px 0;flex-wrap:wrap}.shift-buttons button{padding:7px 12px!important;font-size:15px!important;min-height:36px}.shift-preview{min-width:0}.shift-preview .shift-result{display:flex;flex-wrap:nowrap;white-space:nowrap;font-size:17px;gap:8px;padding:9px 12px!important;margin:6px 0;overflow-x:auto;overflow-wrap:normal}.shift-preview .shift-selection{font-size:15px}

.subtraction-stack{padding:16px;margin:16px 0;background:#f4f7fd;overflow-x:auto}.subtraction-stack>div{display:grid;grid-template-columns:24px 90px 20px minmax(180px,1fr);gap:8px;align-items:center;font-size:19px;line-height:2;white-space:nowrap}.subtraction-stack>div:last-child{border-bottom:2px solid #526ca8;padding-bottom:6px}.subtraction-sides{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin:20px 0}.subtraction-sides label{font-size:14px;line-height:1.9;color:#425878}.subtract-input{width:110px;min-height:45px;padding:7px;font-size:22px;border:2px solid #91a7d8;border-radius:6px;color:#304f93}

.simple-solution>h2{font-size:20px;margin:0 0 20px}.simple-solution>ol{list-style:none;margin:0;padding:0}.simple-solution>ol>li{padding:18px 0;border-top:1px solid #dce4ed}.simple-solution>ol>li:first-child{border-top:0;padding-top:0}.simple-solution h3{font-size:16px;margin:0 0 12px;color:#253e67}.simple-equation{white-space:pre-line;font-size:19px;line-height:1.9;margin:10px 0;color:#233d62;overflow-wrap:anywhere}.simple-solution li.active h3{color:#26765b}.simple-solution .primary{padding:8px 14px!important;font-size:14px}.simple-solution .shift-result{font-size:16px}.simple-solution .shift-choice .step-task{font-size:15px}

.reduction-dialog{width:min(640px,calc(100vw - 32px));max-height:85vh;box-sizing:border-box;overflow-y:auto;padding:24px;border:1px solid #c8d6e5;border-radius:14px;box-shadow:0 24px 80px #172d4e44;color:#253e67}.reduction-dialog::backdrop{background:rgba(18,32,52,.4)}.reduction-dialog h2{margin:0 0 12px;font-size:21px}.reduction-dialog>p{line-height:1.7}.reduction-dialog-actions{display:flex;gap:8px;flex-wrap:wrap}.reduction-dialog-actions button{min-height:42px}.reduction-dialog-actions button:disabled{opacity:.4;cursor:default}

.modal-factor-panels{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}.modal-factor-panel{padding:14px;background:#f5f7fc;border:1px solid #dce4f0;border-radius:8px;min-width:0}.modal-factor-panel h3{font-size:15px;margin:0 0 10px}.modal-factor-current{font-size:27px;font-weight:750;color:#304f93;margin:8px 0}.modal-factor-history{font-size:13px;line-height:1.7}.modal-factor-product{font-size:16px;line-height:1.7;font-weight:700;color:#26765b;overflow-wrap:anywhere}.modal-factor-panel .prime-buttons{grid-template-columns:repeat(2,1fr);gap:6px}.modal-factor-panel .prime-buttons button{font-size:17px;padding:8px!important}.modal-fraction-title{font-size:24px;font-weight:700;margin:10px 0}@media(max-width:480px){.modal-factor-panels{grid-template-columns:1fr}}

.modal-factor-panel .prime-buttons .divisible-prime{background:#e4f3eb!important;border:2px solid #328767!important;color:#226346}.modal-factor-panel .prime-buttons button:disabled{opacity:.35;cursor:default}.modal-divide-guide{font-size:13px;line-height:1.7;color:#26765b}

.decimal-popup-step{padding:14px 0;border-top:1px solid #dce4ed}.decimal-popup-step h3{font-size:16px;margin:0 0 12px}.decimal-fraction-dialog .reduction-dialog-actions{margin-top:20px}

.original-fraction-input{width:170px!important;min-height:48px;font-size:24px;padding:8px}

.digit-cycle{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.digit-cycle>span,.digit-cycle>button{display:flex;flex-direction:column;align-items:center;gap:5px;padding:10px 14px;background:#f1f5fc;border:1px solid #b8c6e2;border-radius:7px}.digit-cycle small{font-size:11px;color:#647794}.digit-cycle b{font-size:24px;color:#304f93}.digit-cycle button.selected{background:#e4f3eb;border:2px solid #328767}

.square-factor-groups{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:14px 0}.square-pair,.square-unpaired{padding:8px 12px;border-radius:7px;font-size:20px;font-weight:700}.square-pair{background:#e2f2e9;border:1px solid #78ad92;color:#226346}.square-unpaired{background:#fff0ed;border:1px solid #d99284;color:#a24232}.square-condition-dialog .shift-buttons button.selected{background:#e4f3eb!important;border-color:#328767!important}
.inequality-board{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:7px;margin:18px 0;padding:8px;border:2px solid #9cacc9;border-radius:14px;background:#fff;flex-wrap:nowrap;}
.inequality-step-row{display:flex;align-items:center;gap:10px;}.inequality-step-row .inequality-board,.inequality-step-row .inequality-expand-line{flex:1;min-width:0;margin:12px 0;}.inequality-confirm{flex:none;white-space:nowrap;align-self:center;}.procedure-row .inequality-expand-line{justify-content:flex-start;}
.inequality-side{flex:1;min-width:0;min-height:76px;display:flex;align-items:center;justify-content:center;flex-flow:row nowrap;gap:5px;padding:6px;border:1px dashed #9cacc9;border-radius:10px;background:#f3f6fc;}
.inequality-side.drag-over{background:#e1edff;border-color:#315fbc;}
.inequality-term{font-size:clamp(14px,1.4vw,18px);font-weight:700;padding:8px 9px;border:2px solid #b2c4e4;background:white;border-radius:10px;cursor:grab;touch-action:manipulation;white-space:nowrap;}
.inequality-term:active{cursor:grabbing;}.inequality-term.selected{border-color:#244f9f;background:#e0eaff;outline:2px solid #244f9f;}.inequality-term:disabled{opacity:1;color:#182d51;cursor:default;}
.inequality-sign{align-self:center;font-size:30px;}.inequality-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px;}.inequality-work label{font-weight:700;}.inequality-work h2{margin-top:0;}
@media(max-width:600px){.inequality-step-row{gap:5px;}.inequality-board{gap:4px;padding:5px;}.inequality-side{gap:3px;padding:3px;}.inequality-term{font-size:13px;padding:5px 4px;border-radius:6px;}.inequality-sign{font-size:20px;}.inequality-confirm{padding:7px 8px!important;font-size:12px!important;}}

.inequality-previous-result{display:flex;flex-direction:column;gap:5px;margin:12px 0;padding:10px 12px;border-left:3px solid #304f93;background:#f2f5fb;border-radius:0 8px 8px 0;}.inequality-previous-result small{font-size:12px;color:#5d6c83;font-weight:700;}.inequality-previous-result strong{font-size:clamp(16px,1.7vw,21px);line-height:1.35;color:#17253a;}
.inequality-history{margin:14px 0;padding:12px;border:1px solid #d9e1ef;border-radius:9px;background:#f8faff;}.inequality-history h3{margin:0 0 8px;font-size:14px;color:#394c69;}.inequality-history ol{display:grid;gap:6px;margin:0;padding:0;list-style:none;}.inequality-history li{display:flex;align-items:baseline;gap:12px;padding:7px 9px;border-radius:6px;background:#fff;border:1px solid #e4e9f2;}.inequality-history li.latest{border-color:#aebfe0;background:#edf3ff;}.inequality-history small{flex:0 0 104px;color:#65738a;font-size:12px;}.inequality-history strong{font-size:clamp(15px,1.55vw,19px);line-height:1.35;color:#17253a;}
.inequality-solution-graph{margin:14px 0 0;padding:12px 14px;border:1px solid #d9e1ef;border-radius:10px;background:#f8faff;}.inequality-solution-graph figcaption{margin-bottom:2px;color:#394c69;font-size:14px;font-weight:700;}.inequality-solution-graph svg{display:block;width:100%;max-height:110px;overflow:visible;font:13px inherit;}.inequality-solution-graph svg text{fill:#48566b;}.inequality-solution-graph svg .graph-boundary{fill:#304f93;font-size:13px;font-weight:700;}.inequality-solution-graph p{margin:0;color:#53647d;font-size:13px;}
.inequality-phases{display:flex;align-items:center;gap:10px;margin:0 0 12px;color:#8490a3;font-size:14px;}.inequality-phases b{padding:6px 10px;border:1px solid #d9e1ef;border-radius:7px;background:#f7f8fb;font-weight:600;}.inequality-phases b.active{border-color:#9aadd1;background:#edf3ff;color:#304f93;font-weight:700;}.inequality-phases span{font-size:18px;}
.procedure-result{min-height:76px;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;color:#17253a;}

.inequality-coefficient-line{flex:1;min-width:0;min-height:76px;display:flex;align-items:center;justify-content:center;gap:clamp(8px,2vw,22px);padding:10px;border:2px solid #9cacc9;border-radius:14px;background:#fff;white-space:nowrap;}.inequality-coefficient-line strong{font-size:clamp(16px,1.8vw,22px);color:#17253a;}.inequality-coefficient-line b{font-size:clamp(19px,2vw,26px);color:#304f93;}.term-organizer-label{margin:4px 0 6px;font-size:13px;font-weight:700;color:#394c69;letter-spacing:.02em;}.inequality-expand-line{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:10px;padding:14px;border:2px solid #9cacc9;border-radius:14px;background:#fff;color:#17253a;font-size:clamp(15px,1.6vw,20px);}.inequality-expand-line b{color:#304f93;font-size:1.2em;}

.function-substitution-instruction{line-height:1.7;color:#394c69}.function-substitution-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:12px;margin:18px 0;align-items:stretch}.function-original,.function-substitution-entry{display:flex;flex-direction:column;gap:10px;min-width:0;padding:14px;border:1px solid #d9e1ef;border-radius:9px;background:#f8faff}.function-original>span,.function-substitution-entry>label{font-size:13px;font-weight:700;color:#536782}.function-original input{width:100%;min-width:0;min-height:50px;padding:8px 10px;border:2px solid #9cacc9;border-radius:7px;background:#fff;color:#17253a;font-size:19px;font-weight:700;font-family:inherit}.function-entry-equation,.function-calculation{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:19px;font-weight:700;color:#17253a;line-height:1.7;overflow-wrap:anywhere}.function-value-input{width:112px;min-height:46px;padding:7px 9px;border:2px solid #91a7d8;border-radius:7px;background:#fff;color:#304f93;font-size:20px;font-weight:700;font-family:inherit}.function-value-input:focus-visible{outline:3px solid #95a9df;outline-offset:1px}.function-substitution-entry>p{margin:0;color:#64738a;font-size:13px;line-height:1.6}.function-substitution-entry>button{align-self:flex-start;margin-top:auto}.function-substitution-work .controls{margin-top:22px}.function-substitution-work .final-answer{font-size:24px;font-weight:750;color:#304f93;overflow-wrap:anywhere}
.function-number-pad{display:grid;grid-template-columns:repeat(4,minmax(38px,1fr));gap:6px}.function-number-pad button{min-height:40px;border:1px solid #d5deeb;border-radius:6px;background:#fff;color:#263c62;font-size:16px;font-weight:700}.function-number-pad button:hover{background:#eaf0fa;border-color:#9cafd0}.function-number-pad button:last-child{grid-column:span 2;font-size:13px}.function-number-pad button:focus-visible{outline:3px solid #95a9df;outline-offset:1px}
.function-substitution-history{margin:12px 0 18px;padding:12px 14px;border:1px solid #d9e1ef;border-radius:9px;background:#f8faff}.function-substitution-history h3{margin:0 0 8px;font-size:14px;color:#394c69}.function-substitution-history ol{display:grid;gap:6px;margin:0;padding:0;list-style:none}.function-substitution-history li{display:flex;align-items:baseline;gap:12px;padding:8px 10px;border:1px solid #e4e9f2;border-radius:6px;background:#fff}.function-substitution-history small{flex:0 0 82px;color:#65738a;font-size:12px}.function-substitution-history strong{font-size:16px;line-height:1.45;color:#17253a;overflow-wrap:anywhere}.inline-function-confirm{flex:none;white-space:nowrap;min-height:42px;padding:8px 12px!important}.function-substitution-entry .function-entry-equation,.function-substitution-entry .function-calculation{gap:8px}
.function-entry-equation{width:100%;flex-wrap:nowrap}.function-input-action{display:flex;align-items:center;gap:8px;flex:1;min-width:0;width:100%}.function-input-action .function-value-input{flex:1;width:100%;min-width:0}.function-calculation>span{flex:1 0 100%}.function-calculation .function-input-action{flex-basis:100%}
@media(max-width:520px){.function-substitution-history li{display:block}.function-substitution-history small{display:block;margin-bottom:4px}.function-substitution-history strong{font-size:15px}.inline-function-confirm{padding:7px 9px!important;font-size:13px}}
@media(max-width:800px){.function-substitution-row{grid-template-columns:1fr}.function-substitution-entry>button{width:100%}}

.inequality-actions.is-complete{position:sticky;bottom:8px;z-index:3;justify-content:flex-end;align-items:center;margin:18px -8px -8px;padding:10px 8px;background:rgba(255,255,255,.96);border-top:1px solid #d9e1ef;border-radius:0 0 10px 10px;backdrop-filter:blur(8px);}
.inequality-actions.is-complete #linearNext{order:2;min-width:148px;padding:12px 20px;font-size:16px;font-weight:700;box-shadow:0 3px 10px rgba(48,79,147,.2);}
.inequality-actions.is-complete #linearRestart{order:1;}
@media(max-width:600px){.inequality-actions.is-complete{bottom:4px;margin-left:-4px;margin-right:-4px;padding:8px 4px;}.inequality-actions.is-complete #linearNext{min-width:126px;padding:10px 14px;}}

.linear-solution-panel{margin:12px 0 0;padding:14px 16px;border:1px solid #d9e1ef;border-radius:10px;background:#f8faff;}.linear-solution-panel h3{margin:0 0 10px;color:#394c69;font-size:16px;}.linear-solution-panel ol{display:grid;gap:7px;margin:0;padding:0;list-style:none;}.linear-solution-panel li{display:flex;align-items:baseline;gap:12px;padding:8px 10px;border-radius:7px;background:#fff;border:1px solid #e4e9f2;}.linear-solution-panel small{flex:0 0 150px;color:#65738a;font-weight:700;}.linear-solution-panel strong{color:#17253a;font-size:16px;line-height:1.45;}.linear-solution-panel[hidden]{display:none;}@media(max-width:600px){.linear-solution-panel li{display:block;}.linear-solution-panel small{display:block;margin-bottom:4px;}}

.intercept-substitution{display:flex;flex-direction:column;gap:5px;margin:14px 0;padding:10px 12px;border:1px solid #d9e1ef;border-radius:9px;background:#f8faff}.intercept-substitution small{font-size:12px;color:#5d6c83;font-weight:700}.intercept-substitution strong{font-size:clamp(17px,1.8vw,22px);line-height:1.4;color:#17253a}


/* Smaller, calmer type for step-by-step problem solving */
.compact-learning .problem h1{font-size:19px;line-height:1.45;letter-spacing:-.35px}.compact-learning .workshop h2{font-size:18px;line-height:1.4;margin-bottom:7px}.compact-learning .workshop>p{font-size:14px;line-height:1.55;margin-bottom:9px}.compact-learning .workshop .current-expression,.compact-learning .intercept-substitution strong,.compact-learning .inequality-history strong{font-size:16px;line-height:1.45}.compact-learning .intercept-substitution{margin:10px 0;padding:8px 10px}.compact-learning .inequality-history{margin:10px 0;padding:9px}.compact-learning .inequality-term{font-size:clamp(13px,1.2vw,15px);padding:6px 8px}.compact-learning .inequality-confirm,.compact-learning .inequality-actions button{font-size:clamp(12px,1.1vw,14px)}


.intercept-y-entry{display:flex;align-items:center;gap:8px;margin-top:8px;font-size:16px;font-weight:700}.intercept-y-entry output{display:grid;place-items:center;min-width:54px;min-height:38px;padding:4px 12px;border:2px solid #b2c4e4;border-radius:7px;background:#fff;color:#17253a}.intercept-number-pad{display:flex;gap:6px;margin-top:7px}.intercept-number-pad button{min-width:54px;min-height:34px;padding:4px 12px;font-size:14px}.intercept-number-pad button[data-y-key='0']{background:#304f93;color:#fff;border-color:#304f93;font-weight:700}
@media(max-width:600px){.intercept-y-entry{font-size:14px}.intercept-y-entry output{min-height:34px}.intercept-number-pad button{min-height:32px;font-size:13px}}




.parallel-shift-graph{margin:8px 0 14px;padding:8px 10px;border:1px solid #d9e1ef;border-radius:8px;background:#fff}.parallel-shift-graph figcaption{font-size:13px;font-weight:700;color:#394c69}.parallel-shift-graph svg{display:block;width:100%;height:auto;max-height:170px;margin:3px auto}.parallel-shift-graph .shift-axis{stroke:#9ba8ba;stroke-width:1.3}.parallel-shift-graph .shift-original{fill:none;stroke:#8994a5;stroke-width:2.5;stroke-dasharray:6 4}.parallel-shift-graph .shift-result{fill:none;stroke:#304f93;stroke-width:3}.parallel-shift-graph .shift-vector{stroke:#c27826;stroke-width:2;stroke-dasharray:4 3}.parallel-shift-graph .shift-dot-original{fill:#8994a5}.parallel-shift-graph .shift-dot-result{fill:#304f93}.parallel-shift-graph .shift-axis-label{fill:#68758a;font-size:12px}.shift-legend{display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;font-size:11px;color:#52627a}.shift-legend span{display:flex;align-items:center;gap:5px}.shift-legend i{display:inline-block;width:19px;border-top:2px solid #304f93}.shift-legend .original-key{border-color:#8994a5;border-top-style:dashed}.shift-legend .result-key{border-color:#304f93}.shift-legend .shift-direction{color:#a5631e;font-weight:700}


.answer-choices{margin-top:12px}.answer-choice-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.answer-choices h2{margin-bottom:7px}.answer-choice{align-items:flex-start;gap:8px;padding:9px 10px!important;font-size:14px;line-height:1.45}.answer-choice span{min-width:0;overflow-wrap:anywhere}.four-choice-actions{justify-content:flex-end;margin-top:8px}
@media(max-width:480px){.answer-choice-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:5px}.answer-choice{padding:7px!important;font-size:13px}}


.simple-solution .shift-choice .step-task{font-size:17px;line-height:1.8}
.shift-keep-x{display:inline-block;padding:8px 12px;border-radius:7px;background:#f4f7fc;color:#233d62;font-weight:700}
.shift-selection-count{margin:8px 0;color:#52627a;font-weight:700}
#app .question-figure.textbook-page img{display:block;max-width:100%;max-height:70vh;width:auto;height:auto;margin:0 auto;object-fit:contain}
#app .question-figure--large svg{max-height:560px!important}
#app .question-figure--compact svg{max-height:250px}