/* Intentionally plain. More personal homepage than product dashboard. */
/* Keep the reading column in the same place on short and long pages. */
html{scrollbar-gutter:stable}
@supports not (scrollbar-gutter:stable){html{overflow-y:scroll}}
@media print{html{scrollbar-gutter:auto;overflow-y:visible}}
.book-problem{margin:18px 0 24px}.book-piece{margin:12px 0;background:white;border:1px solid #ddd;padding:8px}.book-piece a{display:block}.book-piece img{display:block;width:auto;max-width:100%;height:auto;margin:auto}.book-piece figcaption{font-size:11px;color:#666;margin:8px 0 0}.book-transcript{font-size:11px;color:#666;margin-top:12px}.book-transcript summary{cursor:pointer}.book-transcript p{font-size:13px;line-height:1.8;margin-top:10px}.task-dialog:has(.book-problem){width:min(800px,calc(100% - 24px));scrollbar-gutter:stable}.book-problem .source-note{font-size:11px}@media(max-width:550px){.task-dialog:has(.book-problem) .dialog-inner{padding:15px}.book-piece{padding:3px}}
.sheet-tools{margin:0 0 20px;font-size:13px;gap:18px}.formula-filters{margin:0 0 12px}.sheet-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:16px;align-items:start}.sheet-formula{min-width:0;border:1px solid #c2c2af;padding:15px;background:#fffef8}.sheet-formula-heading{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:15px}.sheet-formula-heading h3{font-size:14px;line-height:1.5}.sheet-formula-heading a{flex-shrink:0;font-size:10px}.formula-image-frame{display:block;max-width:100%;overflow:auto;background:#fff;padding:8px 0;text-align:center;border:1px solid #e9e9df}.formula-image-frame img{display:block;width:100%;height:auto;margin:auto}.formula-text{font-size:10px;color:#777;margin-top:10px}.formula-text summary{cursor:pointer}.formula-text p{font-size:12px;color:#333;line-height:1.9;padding:10px 0;overflow-wrap:anywhere}.formula-note{font-size:11px;color:#666;margin-top:9px}.formula-launcher{position:fixed;right:22px;bottom:20px;z-index:45;box-shadow:2px 2px 0 #0002}.formula-popup{position:fixed;right:22px;bottom:20px;width:min(610px,calc(100% - 32px));max-height:min(72vh,780px);z-index:45;display:flex;flex-direction:column;border:1px solid #777;background:#fffef8;box-shadow:4px 4px 0 #0002}.formula-popup-header{display:flex;justify-content:space-between;align-items:start;gap:15px;background:#e5e8d7;border-bottom:1px solid #999;padding:12px 15px}.formula-popup-header h2{font:bold 17px Georgia,serif}.formula-popup-header p{font-size:11px;color:#666;margin-top:3px}.formula-popup-header .icon-btn{flex-shrink:0}.formula-popup-body{overflow:auto;overscroll-behavior:contain;padding:12px;min-height:0}.formula-reference{display:grid;gap:12px}.formula-popup .sheet-formula{padding:12px}.formula-popup .sheet-formula-heading{margin-bottom:10px}.formula-popup .sheet-formula-heading h3{font-size:12px}.formula-popup-footer{display:flex;gap:20px;padding:9px 15px;border-top:1px solid #bbb;background:#f1f2e5;font-size:11px}.formula-utilities{border:1px dotted #aaa;padding:12px;font-size:12px}.formula-utilities>summary{cursor:pointer}.formula-utilities .sheet-formula{margin-top:12px}.assignment-formulas{margin-top:22px;border-top:1px solid #bbb;padding-top:16px;font-size:13px}.assignment-formulas>summary{cursor:pointer;font-weight:bold;margin-bottom:15px}.assignment-formulas .sheet-formula-heading h3{font-size:12px}.assignment-formulas .formula-image-frame img{max-height:none}.task-dialog:has(.assignment-formulas){width:min(760px,calc(100% - 30px))}@media(min-width:1100px){body #app{max-width:1480px;width:calc(100% - 48px)}}@media(max-width:800px){.sheet-grid{grid-template-columns:1fr}.formula-popup{max-height:66vh;right:12px;bottom:12px;width:calc(100% - 24px)}.formula-launcher{right:12px;bottom:12px}.sheet-formula{padding:13px}}@media(max-width:550px){.sheet-tools{gap:12px;font-size:11px}.sheet-formula-heading h3{font-size:13px}.formula-popup-header{padding:10px 12px}.formula-popup-header h2{font-size:15px}.formula-popup-header p{font-size:10px}.formula-popup .sheet-formula{padding:10px}.formula-popup-body{padding:9px}.formula-popup-footer{font-size:10px}.formula-filters .tab{font-size:10px}}@media print{.formula-popup,.formula-launcher{display:none!important}.sheet-grid{grid-template-columns:1fr}.sheet-formula{break-inside:avoid}.formula-text{display:none}}
.paper-table{border-collapse:collapse;width:100%;font-size:13px}.paper-table th,.paper-table td{border:1px solid #c2c2af;text-align:left;padding:12px}.paper-table th{background:#e9ecdc;font-size:12px}.paper-table tr:nth-child(even){background:#f5f5e9}.paper-tools{display:flex;align-items:center;gap:15px;flex-wrap:wrap;font-size:12px;margin:15px 0}.paper-clock{display:flex;gap:8px;align-items:center;margin-left:auto}.paper-clock .timer{font:13px 'Courier New',monospace}.paper-tabs{margin:20px 0}.paper-tabs a{text-decoration:none}.paper-task-heading{font-size:21px!important;margin:20px 0 14px!important}.paper-status{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.paper-image-link{display:block;border:1px solid #bbb;background:white}.exam-page-image{display:block;width:100%;height:auto}.paper-status .assignment-chip{min-width:65px}.paper-tools .text-button{font-size:11px}@media(max-width:550px){.paper-table{font-size:11px}.paper-table th,.paper-table td{padding:8px}.paper-table .table-area{font-size:9px}.paper-table th:nth-child(2),.paper-table td:nth-child(2){max-width:105px}.paper-clock{margin-left:0;width:100%;margin-top:5px}.paper-task-heading{font-size:20px!important}.paper-status{gap:6px}.paper-status>.small{width:100%;font-size:11px}.paper-status .assignment-chip{min-width:58px}}
.topic-table{width:100%;border-collapse:collapse;font-size:13px;background:#fffef8}.topic-table th,.topic-table td{text-align:left;padding:10px 12px;border:1px solid #c2c2af}.topic-table th{background:#e9ecdc;font-size:12px}.topic-table tr:nth-child(even) td{background:#f5f5e9}.topic-table th:first-child,.topic-table td:first-child{width:55px;text-align:center}.topic-table th:last-child,.topic-table td:last-child{width:120px;text-align:center;font-family:'Courier New',monospace}.table-area{display:block;font-size:10px;color:#888;margin-top:3px}@media(max-width:550px){.topic-table{font-size:12px}.topic-table td,.topic-table th{padding:8px}.topic-table th:last-child,.topic-table td:last-child{width:85px;font-size:10px}.topic-table th:first-child,.topic-table td:first-child{width:40px}}
:root{font:15px/1.5 Arial,Helvetica,sans-serif;color:#222;background:#eeeeda;--ink:#222;--muted:#666;--line:#b5b5a4;--forest:#234777;--mint:#edf2e7;--peach:#fff0d9;--lime:#ecf5cc}
*{box-sizing:border-box}body{margin:0}a{color:#144c9a;text-decoration:underline}a:visited{color:#654291}button,input,select,textarea{font:inherit}button{cursor:pointer;color:#222}button:disabled{cursor:default;color:#888}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid #0b59b1;outline-offset:3px}button,a{touch-action:manipulation}svg{display:inline-block;vertical-align:middle}h1,h2,h3,h4,p{margin:0}h1{font: bold 29px Georgia,'Times New Roman',serif}h2{font:bold 22px Georgia,'Times New Roman',serif}h3{font:bold 17px Arial,sans-serif}h4{font-size:14px}p{line-height:1.65}input,select,textarea{background:white;border:1px solid #888;padding:7px}input[type=checkbox]{padding:0;accent-color:#245389}textarea{width:100%;resize:vertical}.small,.source-note{font-size:12px}.muted,.source-note{color:#666}.source-note{margin-top:15px;line-height:1.65}.eyebrow{font-size:11px;color:#666;letter-spacing:0;text-transform:none;font-weight:normal}.row{display:flex;align-items:center;gap:10px}.between{justify-content:space-between}.wrap{flex-wrap:wrap}.stack{display:grid;gap:20px}.space{margin-top:24px}.hidden{display:none!important}.skip-link{position:absolute;top:-90px;background:white;padding:10px}.skip-link:focus{top:0;z-index:50}
#app{max-width:1040px;margin:18px auto;border:1px solid #999;background:#fffef8;min-height:95vh}.sidebar{position:static;width:auto;background:#e5e8d7;padding:18px 25px 0;border-bottom:1px solid #888;color:#222}.brand{display:inline-flex;align-items:center;gap:8px;font:bold 29px 'Courier New',monospace;letter-spacing:-1px;color:#222!important;text-decoration:none}.brand b{font-weight:bold;color:inherit}.brand-mark{font:32px Georgia,serif}.brand>span>span{display:none}.side-label{display:inline;margin-left:15px;font:italic 13px Georgia,serif;color:#666}.nav{display:flex;flex-wrap:wrap;gap:0;margin-top:15px}.nav a{display:flex;align-items:center;gap:5px;padding:8px 12px;border:1px solid transparent;border-bottom:0;color:#144c9a;font-size:13px;text-decoration:underline;white-space:nowrap}.nav a:first-child{padding-left:0;padding-right:16px}.nav a.active{background:#fffef8;border:1px solid #999;border-bottom:1px solid #fffef8;margin-bottom:-1px;font-weight:bold;text-decoration:none;color:#222}.nav a.active:first-child{padding-left:12px}.nav a svg{display:none}.nav-count{font-size:10px;padding:0 4px;background:#dedfcf;border:1px solid #aaa}.side-bottom{display:none}.main-shell{margin:0;min-height:0}.topbar{display:flex;justify-content:space-between;padding:9px 25px;border-bottom:1px dotted #b7b7a9;font-size:11px;color:#666}.breadcrumb{font-size:11px}.topbar-right{font-size:11px;gap:10px}.topbar-right>.badge{display:none}.sync-link{font-size:11px;border:0;background:transparent;padding:0;color:#144c9a;text-decoration:underline;cursor:pointer}.sync-link svg{width:12px}.sync-dot{width:6px;height:6px;background:#65964b;display:inline-block;margin-right:5px}.sync-dot.offline{background:#bf862b}.mobile-menu{display:none}.main{padding:25px;max-width:none;margin:0}.page-heading{margin-bottom:22px}.page-heading>.eyebrow{display:none}.page-heading .muted{margin-top:8px;font-size:13px}.badge{display:inline-flex;align-items:center;gap:5px;font-size:11px;border:1px solid #c1c1ae;background:#f4f4e9;padding:3px 7px;white-space:nowrap}.badge.soft,.badge.lime{background:#eaf0dc;border-color:#b8c4a5}.badge.orange{background:#fff0d9;border-color:#d4bd8f}
.btn,button.icon-btn,.tab,.status-choice{border:1px solid #999;border-radius:0;background:linear-gradient(#fff,#e7e7df);box-shadow:inset 1px 1px #fff;padding:7px 12px;min-height:34px;font-size:13px;color:#222;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:7px}.btn:hover,.tab:hover,.status-choice:hover{background:#e7ebdc;border-color:#777}.btn svg{width:15px;height:15px}.btn.lime,.btn.orange{background:#e4edcb}.btn.small{font-size:12px;min-height:30px;padding:6px 10px}.btn.secondary{background:linear-gradient(#fff,#eeeeea)}.btn.ghost{background:transparent;border:0;box-shadow:none;padding:0;text-decoration:underline;color:#144c9a}.icon-btn{width:33px;height:33px;padding:5px!important}.text-button{border:0;background:transparent;box-shadow:none;color:#144c9a;text-decoration:underline;font:13px Arial,sans-serif;padding:3px 0;display:inline-flex;align-items:center;gap:6px;min-height:30px}.text-button svg{width:14px}.card{padding:20px;border:1px solid #b8b8a6;background:#fffef8;border-radius:0;box-shadow:none}.hero{border:1px solid #a8b597;background:#eff2e4;padding:22px;margin-bottom:20px}.hero h2{font-size:23px;margin-bottom:10px}.hero p{font-size:14px;max-width:650px}.hero .btn{margin-top:15px}.hero-note{font-size:11px;color:#666;margin-top:10px}.hero-art{display:none}.metrics{display:flex;flex-wrap:wrap;gap:10px 25px;margin:20px 0 25px;padding:13px 0;border-top:1px dotted #bbb;border-bottom:1px dotted #bbb}.metric{display:flex;align-items:center;gap:7px;font-size:13px}.metric-icon{display:none}.metric strong{font-size:17px;font-family:'Courier New',monospace}.metric em{font-size:12px;font-style:normal;color:#777}.metric span{display:inline;font-size:11px;color:#666;margin-left:5px}.dashboard-duo{display:grid;grid-template-columns:1.25fr 1fr;gap:18px}.dashboard-duo h3{font-size:16px}.path-list{margin-top:10px}.path-item{display:flex;align-items:center;gap:10px;border-bottom:1px dotted #c5c5b7;padding:12px 0}.path-item h4{font-size:13px;color:#144c9a;text-decoration:underline}.path-item p{font-size:11px;color:#777}.path-number{font:12px 'Courier New',monospace;color:#555}.path-item>svg{margin-left:auto;width:13px;color:#777}.lab-teaser{background:#f6f3e6;display:flex;flex-direction:column;gap:10px;position:relative}.lab-teaser .eyebrow{display:none}.lab-teaser h3{font-size:17px}.lab-teaser p{font-size:13px;color:#666}.lab-teaser .text-button{margin-top:auto}.lab-teaser>svg{display:none}.section-head{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:27px 0 15px}.section-head h2{font-size:21px}.section-head p{font-size:12px;color:#666;margin-top:5px}.tabs{display:flex;flex-wrap:wrap;gap:5px}.tab{font-size:12px;min-height:31px;padding:5px 10px}.tab.active{background:#e0e6cf;border-color:#777;font-weight:bold}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.topic-card{display:flex;flex-direction:column;border:1px solid #cccaba;background:#fafaf2;padding:14px;text-decoration:none!important;color:#222!important}.topic-card:hover{background:#eef0e3;border-color:#8e9d7a}.topic-top{display:flex;justify-content:space-between;margin-bottom:9px;align-items:center}.topic-icon{display:inline-grid;place-items:center;width:31px;height:31px;background:transparent!important;color:#607047}.topic-icon svg{width:23px;height:23px}.chapter-tag{font-size:10px;color:#666}.topic-card h3{font-size:13px;color:#144c9a;text-decoration:underline;margin-bottom:5px}.topic-card .small{font-size:10px}.topic-progress{margin-top:15px}.progress-track{height:6px;background:#e7e8dd;border:1px solid #b8bdae;overflow:hidden}.progress-track span{height:100%;display:block;background:#8caa64}.topic-foot{font-size:10px;color:#777;display:flex;justify-content:space-between;margin-top:6px}.topic-foot span:last-child{display:none}.bottom-note{font-size:10px;color:#888;text-align:center;border-top:1px dotted #ccc;margin-top:35px;padding-top:15px}.paper-banner{display:flex;align-items:center;gap:12px;border:1px solid #d1cba7;background:#faf7e8;padding:12px 15px;font-size:12px}.paper-banner h3{font-size:13px;margin-bottom:4px}.paper-banner p{font-size:12px;color:#6b6b58}.paper-banner svg{flex-shrink:0}.modes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:20px 0}.mode-card{display:flex;flex-direction:column;gap:12px;padding:17px}.mode-card>.topic-icon{display:none}.mode-card p{font-size:12px;color:#666}.mode-card h3{font-size:15px}.mode-card .btn{margin-top:auto;align-self:flex-start}.topic-detail{display:grid;grid-template-columns:1.3fr 1fr;gap:20px;margin-top:20px}.formula{font-family:Georgia,'Times New Roman',serif;font-size:21px;line-height:1.7;overflow-wrap:anywhere}.formula-item{border-bottom:1px dotted #c6c8b8;padding:14px 0}.formula-item:last-child{border:0}.formula-item p{font-size:12px;color:#666;margin-top:4px}.exclusion{font-size:12px;background:#f1f1e5;border:1px solid #d0d1bd;padding:12px;line-height:1.7}.type-row{width:100%;display:flex;gap:10px;align-items:center;border:1px solid #ccc;background:#fafaf4;padding:12px;text-align:left}.type-row:hover{background:#edf0df}.task-types{display:grid;gap:8px}.type-row h3{font-size:13px}.type-row p{font-size:11px;color:#666;margin-top:4px}.level{margin-left:auto;display:flex;gap:2px;flex-shrink:0}.level i{width:4px;height:10px;background:#ddd}.level i.on{background:#7d915b}.formula-search{width:100%;margin:0 0 20px;padding:9px;font-size:13px}.formula-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px}.formula-card h3{font-size:15px}.formula-card .idea{font-size:12px;color:#666;margin-top:12px}.constant-strip{display:flex;flex-wrap:wrap;gap:10px 20px;border:1px solid #bbb;background:#f0f1e6;padding:12px;font-size:12px;margin-bottom:20px}.constant-strip strong{font-family:Georgia,serif;font-weight:normal}
.session-header{display:flex;align-items:center;gap:13px;margin-bottom:20px}.session-header .progress-track{flex:1}.session-count{font-size:12px;white-space:nowrap}.timer{font-size:11px;font-variant-numeric:tabular-nums;white-space:nowrap;color:#666}.session-layout{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(210px,.8fr);gap:18px;align-items:start}.question-card{padding:25px}.question-card h2{font-size:25px;margin:18px 0}.question-text{font-size:16px;line-height:1.9}.given-row{display:flex;flex-wrap:wrap;gap:7px;margin:20px 0}.given{font-size:12px;border:1px solid #d4d4c4;background:#f4f4ea;padding:6px 9px}.given b{font-family:Georgia,serif;font-size:14px;font-weight:normal;margin-right:8px}.write-first{display:flex;align-items:flex-start;gap:10px;background:#faf7e8;border:1px solid #d4ceb0;padding:13px;font-size:12px;margin:20px 0}.write-first strong{display:block;margin-bottom:4px}.write-first p{font-size:12px;color:#6b6b58}.write-first svg{flex-shrink:0}.answer-form{border-top:1px solid #bbb;padding-top:20px;margin-top:25px}.answer-form label{display:block;font-size:13px;font-weight:bold;margin-bottom:8px}.answer-inputs{display:flex;gap:8px}.answer-inputs input{min-width:0;flex:1;width:100%;font-family:'Courier New',monospace;font-size:20px}.answer-inputs select{max-width:110px;font-size:13px}.answer-form .help{font-size:11px;color:#777;margin-top:8px}.answer-actions{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:17px}.feedback{padding:13px;font-size:13px;border:1px solid #d4bd8f;background:#fff6e0;margin-top:18px;line-height:1.7}.feedback.correct{background:#eff6df;border-color:#a7be85}.feedback h3{font-size:15px;margin-bottom:6px}.hint-card{padding:17px;background:#f7f7ed}.hint-card h3{font-size:15px;margin:5px 0 10px}.hint-card>p{font-size:12px;color:#666}.hint-card .btn{margin-top:14px;width:100%}.hint-entry{border-top:1px dotted #bbb;padding:13px 0;font-size:13px;line-height:1.8}.hint-entry .eyebrow{display:block;margin-bottom:5px}.paper-steps{list-style:none;padding:0;margin:13px 0}.paper-steps li{font-size:12px;padding:7px 0;display:flex;gap:8px;align-items:center}.paper-steps i{font:12px 'Courier New',monospace;font-style:normal;width:20px;flex-shrink:0;color:#777}.solution{border-top:1px solid #bbb;padding-top:20px;margin-top:22px}.solution h3{font-size:16px;margin-bottom:18px}.solution-step{display:grid;grid-template-columns:135px 1fr;gap:10px;margin-bottom:20px;line-height:1.85;font-size:13px}.solution-step strong{font-size:11px;color:#666}.solution-step.math p{font:18px/1.8 Georgia,serif;overflow-wrap:anywhere}.solution-check{padding:13px;border:1px solid #ccc;background:#f7f7ec;font-size:12px;margin-top:22px}.checkline{display:flex;align-items:flex-start;gap:9px;line-height:1.7;margin-top:8px}.checkline input{margin-top:4px}.next-button{margin-top:20px}.intro-card{max-width:660px;margin:25px auto;padding:30px;text-align:center}.intro-card>.topic-icon{margin:0 auto 20px;width:45px;height:45px}.intro-card>.topic-icon svg{width:35px;height:35px}.intro-card>p{font-size:14px;color:#666;margin:15px auto 20px;max-width:500px}.intro-card .paper-steps{max-width:430px;margin:20px auto;text-align:left}.intro-card .paper-steps li{padding:10px 0;font-size:13px}.intro-card .btn{margin-top:20px}.session-summary{text-align:center;padding:25px 15px}.summary-orbit{display:none}.summary-numbers{display:flex;justify-content:center;gap:35px;margin:25px 0}.summary-numbers strong{font:bold 27px 'Courier New',monospace;display:block}.summary-numbers span{font-size:11px;color:#666}.results-list{max-width:800px;margin:20px auto}.result-row{padding:15px 0;border-bottom:1px dotted #bbb}.result-row summary{cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:13px;color:#144c9a}.result-row .solution{color:#222}
.teacher-header{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:25px 0 18px}.teacher-header p{font-size:12px;color:#666;margin-top:7px}.teacher-toolbar{display:flex;gap:10px;align-items:center;margin-bottom:15px}.select{font-size:12px;padding:8px;max-width:100%}.status-key{display:flex;flex-wrap:wrap;gap:17px;font-size:11px;color:#666;margin:15px 0}.status-key span{display:flex;gap:5px;align-items:center}.status-dot{width:8px;height:8px;background:#ddd;border:1px solid #aaa;display:inline-block}.status-dot.done{background:#b6cd91}.status-dot.again{background:#f4d18f}.assignment-section{padding:18px 0;border-top:1px dotted #bbb}.assignment-section:first-child{border:0;padding-top:0}.assignment-section h3{font-size:13px;margin-bottom:12px}.assignment-chips{display:flex;flex-wrap:wrap;gap:7px}.assignment-chip{background:#f8f8ef;border:1px solid #bbb;padding:8px 10px;min-width:70px;min-height:35px;font-size:13px;display:flex;align-items:center;gap:6px}.assignment-chip:hover{background:#eaedde}.assignment-chip.done{background:#e1edca;border-color:#9bad7e}.assignment-chip.again{background:#fff0cc;border-color:#cfb785}.chip-check{font-size:11px;color:#777}.empty{border:1px dashed #b9bca8;padding:25px;text-align:center;font-size:13px;color:#666}.empty h3{font-size:16px;margin-bottom:7px;color:#333}.task-dialog{width:min(550px,calc(100% - 25px));max-height:90vh;border:1px solid #777;border-radius:0;padding:0;background:#fffef8;color:#222;box-shadow:5px 5px 0 #0002}.task-dialog::backdrop{background:#0005}.dialog-inner{padding:24px}.dialog-inner h2{margin:15px 0 9px}.dialog-inner>p{font-size:13px;color:#666}.status-options{display:grid;grid-template-columns:repeat(3,1fr);gap:7px;margin:22px 0}.status-choice{padding:9px 5px;font-size:12px}.status-choice.active{background:#e2eacb;border-color:#7e9655}.dialog-label{display:block;margin-bottom:8px;font-size:12px;font-weight:bold}.dialog-inner textarea{min-height:95px;font-size:13px}.dialog-actions{display:flex;justify-content:space-between;gap:10px;margin-top:20px}.progress-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:18px}.activity-grid{display:grid;grid-template-columns:repeat(14,1fr);gap:4px;margin-top:20px}.day-cell{aspect-ratio:1;background:#e6e8da;border:1px solid #d2d5c1}.day-cell.active{background:#a9c77b;border-color:#8eaa66}.activity-legend{display:flex;justify-content:space-between;font-size:10px;color:#777;margin-top:7px}.progress-row{display:grid;grid-template-columns:175px 1fr 35px;align-items:center;gap:15px;padding:12px 0;border-bottom:1px dotted #ccc;font-size:12px}.progress-row span:last-child{text-align:right;font-size:11px;color:#666}.repetition-row{display:flex;justify-content:space-between;gap:10px;padding:13px 0;border-bottom:1px dotted #bbb;font-size:13px}.repetition-row span{font-size:11px;color:#777}.settings-form{display:flex;align-items:end;gap:10px;margin-top:20px;flex-wrap:wrap}.settings-form label{display:block;font-size:12px;margin-bottom:6px}.settings-form input{font-size:13px}.export-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:20px}.source-list{display:grid;gap:17px;margin-top:20px}.source-item{padding:15px;border:1px solid #ccc;background:#f6f6eb;font-size:13px;line-height:1.8}.source-item strong{display:block;margin-bottom:6px}
.lab-tabs{margin-bottom:20px}.lab-layout{display:grid;grid-template-columns:minmax(0,1.7fr) minmax(210px,.8fr);gap:18px}.lab-stage{border:1px solid #a7b48e;background:#f0f3e4;overflow:hidden}.lab-stage-header{display:flex;justify-content:space-between;padding:15px 15px 0;font-size:9px;color:#667255}.lab-stage svg{width:100%;height:auto;aspect-ratio:1.7;max-height:390px}.lab-caption{border-top:1px solid #c8d0b6;padding:10px 13px;font-size:11px;line-height:1.7;color:#667255}.lab-controls h3{font-size:16px}.slider-control{margin:22px 0}.slider-label{display:flex;justify-content:space-between;font-size:12px;margin-bottom:10px}.slider-label strong{font:13px 'Courier New',monospace}.slider-control input{width:100%;padding:0;accent-color:#788e4c}.lab-begin{width:100%;margin-top:15px;font-size:12px}.lab-values{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:13px}.lab-value{border:1px solid #bbb;background:#f9f9ed;padding:12px}.lab-value span{display:block;font-size:10px;color:#777;margin-bottom:5px}.lab-value strong{font:bold 16px 'Courier New',monospace}.lab-question{margin-top:20px;background:#faf7e8}.lab-question h3{font-size:15px}.lab-question p{font-size:13px;margin-top:10px;color:#666}.lab-explanation{border-top:1px dotted #b6b6a6;margin-top:20px;padding-top:20px}.lab-explanation p{margin:10px 0}.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);border:1px solid #8e9c71;background:#f3f7e7;padding:13px 20px;font-size:13px;z-index:100;max-width:calc(100% - 30px);box-shadow:2px 2px 0 #0002;display:none}.toast.show{display:block}.loading-screen{min-height:280px;display:grid;place-content:center;text-align:center;gap:15px}.loading-screen p{font-size:12px;color:#777}.spinner{width:25px;height:25px;border:2px solid #ccd3bc;border-top-color:#789151;border-radius:50%;animation:spin 1s linear infinite;margin:auto}@keyframes spin{to{transform:rotate(360deg)}}
@media(max-width:800px){#app{margin:0;border-left:0;border-right:0;min-height:100vh}.sidebar{padding:15px 18px 0}.nav a{font-size:12px;padding:8px}.topbar{padding:9px 18px}.main{padding:22px 18px}.session-layout,.topic-detail,.lab-layout{grid-template-columns:1fr}.session-sidebar{display:grid;grid-template-columns:1fr 1fr;gap:15px}.session-sidebar>.space{margin:0}.solution-step{grid-template-columns:1fr;gap:4px}.modes{gap:10px}.mode-card{padding:14px}.mode-card h3{font-size:14px}.mode-card .btn{font-size:11px}.lab-controls{display:grid;grid-template-columns:1fr 1fr;gap:0 25px}.lab-controls h3,.lab-controls .lab-begin{grid-column:1/-1}.lab-controls .slider-control{margin:16px 0}.teacher-toolbar{flex-wrap:wrap}.teacher-header{flex-wrap:wrap}.progress-grid{grid-template-columns:1fr}.formula-grid{grid-template-columns:1fr}}
@media(max-width:550px){.brand{font-size:26px}.side-label{font-size:11px;margin-left:8px}.nav{margin-top:12px;gap:2px}.nav a{font-size:11px;padding:7px 6px}.nav a:first-child{padding-right:8px}.nav a.active:first-child{padding-left:6px}.topbar{padding:8px 15px}.breadcrumb{font-size:10px}.sync-link{font-size:10px}.sync-link svg{display:none}.main{padding:21px 15px}.page-heading h1{font-size:26px}.page-heading .row{flex-wrap:wrap;gap:10px}.page-heading .badge{font-size:10px}.hero{padding:17px}.hero h2{font-size:21px}.hero p{font-size:13px}.metrics{gap:12px 0}.metric{width:50%;gap:0}.metric span{display:block;margin:0;font-size:10px}.metric strong{font-size:19px}.dashboard-duo{grid-template-columns:1fr}.card{padding:17px}.section-head{flex-wrap:wrap;gap:10px}.section-head h2{font-size:20px}.topic-grid{grid-template-columns:repeat(2,1fr);gap:8px}.topic-card{padding:12px}.topic-card h3{font-size:12px}.topic-top{margin-bottom:6px}.topic-icon{width:25px;height:25px}.chapter-tag{font-size:9px}.topic-foot{font-size:9px}.topic-progress{margin-top:12px}.topic-icon svg{width:21px;height:21px}.modes{grid-template-columns:1fr}.mode-card{gap:10px;padding:17px}.mode-card .btn{font-size:12px}.paper-banner{padding:11px}.paper-banner svg{display:none}.paper-banner h3{font-size:12px}.paper-banner p{font-size:11px}.question-card{padding:18px}.question-card h2{font-size:23px}.question-text{font-size:15px}.given{font-size:11px;padding:5px 7px}.write-first{padding:11px}.write-first svg{display:none}.answer-inputs select{max-width:95px;font-size:12px}.answer-inputs input{font-size:19px}.answer-actions{align-items:stretch;flex-direction:column}.answer-actions .text-button{justify-content:center}.session-header{gap:8px}.session-count,.timer{font-size:10px}.session-sidebar{display:block}.paper-coach{display:none}.intro-card{padding:24px 18px}.intro-card h1{font-size:25px}.intro-card>p{font-size:13px}.intro-card .paper-steps li{font-size:12px}.intro-card .btn{font-size:12px}.summary-numbers{gap:20px}.summary-numbers strong{font-size:24px}.summary-numbers span{font-size:10px}.session-summary h1{font-size:25px}.result-row summary{font-size:12px}.result-row .badge{font-size:9px}.teacher-header h2{font-size:21px}.teacher-toolbar .tabs{width:100%}.teacher-toolbar .select{width:100%}.tab{font-size:11px;padding:6px 9px}.assignment-chip{min-width:65px;font-size:12px;padding:8px}.dialog-inner{padding:20px}.status-choice{font-size:11px}.dialog-actions{flex-wrap:wrap}.progress-row{grid-template-columns:125px 1fr 25px;gap:10px;font-size:11px}.constant-strip{font-size:11px}.lab-controls{display:block}.lab-stage-header{font-size:8px;padding:11px 11px 0}.lab-stage svg{aspect-ratio:1.45}.lab-values{gap:6px}.lab-value{padding:10px}.lab-value strong{font-size:14px}.lab-value span{font-size:9px}.lab-caption{font-size:10px}.lab-question h3{font-size:14px}.toast{font-size:12px;width:max-content}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
@media print{#app{border:0;margin:0;max-width:none}.sidebar,.topbar,.session-sidebar,.answer-form,.btn,.toast,.bottom-note,.session-header{display:none!important}.main{padding:0}.session-layout{display:block}.card{border:0;padding:0}.solution{break-inside:avoid}.question-text{font-size:14px}}