:root{--canvas:#f7f5ef;--paper:#fffdf9;--ink:#10233f;--muted:#647184;--teal:#087267;--teal2:#dff2ed;--line:#ded9d0;--amber:#f4c76f;--coral:#c95d49;--blue:#327ca8;--shadow:0 14px 36px rgba(16,35,63,.08)}
*{box-sizing:border-box}body{margin:0;min-width:320px;background:radial-gradient(circle at 90% -5%,#dff2ed 0,transparent 32rem),var(--canvas);color:var(--ink);font-family:Inter,"Segoe UI",Arial,sans-serif}button,input,textarea{font:inherit}button,a{transition:.18s ease}button{cursor:pointer}.site-header{position:sticky;top:0;z-index:20;min-height:76px;padding:12px 34px;display:flex;align-items:center;gap:28px;border-bottom:1px solid var(--line);background:rgba(255,253,249,.94);backdrop-filter:blur(12px)}.brand{display:flex;align-items:baseline;gap:14px;color:var(--ink);text-decoration:none}.brand strong{font-size:26px}.brand span{font-weight:750;letter-spacing:.08em;color:var(--teal)}.save-status{margin-left:auto;color:var(--teal);font-size:13px;font-weight:700}.site-header nav{display:flex;gap:10px}.site-header nav a,.site-header nav button{padding:9px 13px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink);text-decoration:none}.pilot{text-align:center;padding:8px;background:#fff4d8;color:#70501d;font-size:13px}#app{max-width:1500px;margin:auto;padding:42px 34px 100px}.start-screen{max-width:790px;margin:9vh auto;padding:48px;border:1px solid var(--line);border-radius:24px;background:var(--paper);box-shadow:var(--shadow)}.eyebrow{margin:0 0 8px;color:var(--teal);font-size:12px;font-weight:850;letter-spacing:.14em}.start-screen h1{font-size:clamp(36px,6vw,66px);line-height:1;margin:10px 0 20px}.start-screen>p:not(.eyebrow){max-width:650px;color:var(--muted);font-size:18px;line-height:1.65}.start-screen label{display:block;margin:28px 0 9px;font-weight:800}.topic-row{display:flex;gap:10px}.topic-row input{flex:1;min-width:0;padding:16px;border:1px solid var(--line);border-radius:12px;font-size:17px}.primary{padding:12px 18px;border:1px solid var(--teal);border-radius:10px;background:var(--teal);color:#fff;font-weight:800}.primary:hover{background:#075c54}.examples{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.examples button,.result-actions button,.question-actions button{padding:9px 13px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--ink)}.studio{display:grid;grid-template-columns:minmax(0,1fr) 370px;gap:28px}.work-column{min-width:0}.card,.curriculum-panel{border:1px solid var(--line);border-radius:18px;background:var(--paper);box-shadow:var(--shadow)}.card{padding:30px;margin-bottom:20px}.welcome-card h1{margin:6px 0 10px;font-size:38px}.welcome-card>p:last-of-type{color:var(--muted);line-height:1.65}.map-meta{display:flex;gap:8px;margin-top:20px}.map-meta span,.card-head>span,.question-top>span{padding:6px 10px;border-radius:999px;background:var(--teal2);color:var(--teal);font-size:12px;font-weight:800}.curriculum-panel{position:sticky;top:112px;max-height:calc(100vh - 140px);overflow:auto}.panel-head{padding:26px;border-bottom:1px solid var(--line)}.panel-head h2{margin:5px 0 8px}.panel-head>p:last-child{color:var(--muted);line-height:1.45;font-size:14px}.depth-group{border-bottom:1px solid var(--line)}.depth-head{width:100%;display:flex;align-items:center;gap:12px;padding:18px 22px;border:0;background:transparent;text-align:left}.depth-num{display:grid;place-items:center;width:31px;height:31px;border-radius:9px;background:var(--teal2);color:var(--teal);font-weight:900}.depth-head div{flex:1}.depth-head strong,.depth-head small{display:block}.depth-head small{margin-top:3px;color:var(--muted)}.set-list{padding:0 16px 18px}.set-button{width:100%;display:flex;align-items:center;gap:9px;padding:11px;margin-top:6px;border:1px solid transparent;border-radius:10px;background:#f8f6f1;text-align:left}.set-button:hover,.set-button.active{border-color:var(--teal);background:var(--teal2)}.set-button.checkpoint{background:#fff4d8}.set-icon{font-size:16px}.card-head,.question-top{display:flex;align-items:center;gap:15px}.card-head>div{flex:1}.card h2{margin:5px 0 12px}.teaching-card>p{color:var(--muted);line-height:1.65}.teaching-steps{display:grid;gap:9px;margin:20px 0}.teaching-step{display:flex;gap:12px;padding:13px;border-radius:11px;background:#f4f8f7}.teaching-step b{display:grid;place-items:center;flex:0 0 27px;height:27px;border-radius:50%;background:var(--teal);color:#fff}.worked-example{margin:20px 0;padding:20px;border-left:5px solid var(--amber);border-radius:8px;background:#fff8e8;line-height:1.65}.progress{height:7px;flex:1;overflow:hidden;border-radius:99px;background:#e9e5dd}.progress i{display:block;height:100%;background:var(--teal);transition:width .3s}.question-card h2{font-size:27px;line-height:1.35;margin-top:26px}.question-card>p{color:var(--muted)}.working-label,.answer-label{display:block;margin:22px 0 8px;font-weight:800}.question-card textarea,.question-card input{width:100%;padding:14px;border:1px solid var(--line);border-radius:10px;background:#fff}.question-card input{font-size:18px}.symbol-bar{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}.symbol-bar button{min-width:38px;padding:7px;border:1px solid var(--line);border-radius:7px;background:#fff}.question-actions,.result-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:22px}.question-actions .primary,.result-actions .primary{border-radius:10px}.visual-aid{padding:16px;border-radius:12px;background:#eef6fb;color:#1b5b7d;white-space:pre-wrap}.feedback-card{display:flex;gap:18px}.feedback-card.correct{border-left:6px solid var(--teal)}.feedback-card.incorrect{border-left:6px solid var(--coral)}#feedback-mark{display:grid;place-items:center;flex:0 0 44px;height:44px;border-radius:50%;background:var(--teal2);font-size:22px}.feedback-card>div:last-child{flex:1}.feedback-card p,#feedback-method{line-height:1.6}.feedback-card #feedback-method{padding:14px;border-radius:10px;background:#f5f3ed}.result-score{font-size:50px;font-weight:900;color:var(--teal)}.result-card p{color:var(--muted);line-height:1.6}.loading{display:flex;align-items:center;gap:14px;padding:18px;margin-bottom:16px;border-radius:13px;background:var(--teal2)}.loading span{width:22px;height:22px;border:3px solid #9ccdc2;border-top-color:var(--teal);border-radius:50%;animation:spin .8s linear infinite}.loading p{margin:3px 0;color:var(--muted)}#toast{position:fixed;right:24px;bottom:24px;z-index:50;padding:12px 16px;border-radius:10px;background:var(--ink);color:#fff;opacity:0;transform:translateY(10px);pointer-events:none;transition:.2s}#toast.show{opacity:1;transform:none}@keyframes spin{to{transform:rotate(360deg)}}button:focus-visible,input:focus-visible,textarea:focus-visible,a:focus-visible{outline:3px solid #2684d9;outline-offset:2px}@media(max-width:950px){.studio{grid-template-columns:1fr}.curriculum-panel{position:static;max-height:none;order:-1}.site-header{padding:10px 16px}.save-status{display:none}#app{padding:24px 16px 90px}}@media(max-width:600px){.brand span{display:none}.site-header nav button{display:none}.start-screen{padding:28px 20px;margin:3vh auto}.topic-row{display:block}.topic-row button{width:100%;margin-top:10px}.card{padding:22px 18px}.question-actions,.result-actions{flex-direction:column}.question-actions button,.result-actions button{width:100%}}
/* Universal response workspace */
.teaching-breakdown{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:18px 0;padding:20px;border-radius:12px;background:#f8f7f3;font-size:25px;font-weight:850}.teaching-token{padding:5px 8px;border-radius:7px}.teaching-token.remove{background:#ffe4df;color:#a83b2c;text-decoration:line-through}.teaching-token.keep{background:#e6f0ff;color:#245d9a}.teaching-token.add{background:#dff4e7;color:#087044}.teaching-token.note{font-size:14px;font-weight:650;color:var(--muted)}.teaching-simulation{margin:20px 0;padding:20px;border:1px solid #b8d8e9;border-radius:14px;background:#eef8fc}.teaching-simulation h3{margin:4px 0}.simulation-mount{min-height:150px;margin-top:14px;border:1px dashed #71a8c5;border-radius:11px;background:#fff;display:grid;place-items:center;color:#35718f;text-align:center;padding:18px}.choice-response{display:grid;gap:9px;margin:22px 0}.choice-option{display:flex;align-items:flex-start;gap:10px;padding:14px;border:1px solid var(--line);border-radius:11px;background:#fff;cursor:pointer}.choice-option:has(input:checked){border-color:var(--teal);background:var(--teal2)}.choice-option input{width:auto;margin-top:3px}.question-top #review-example{padding:6px 9px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--teal);font-size:12px;font-weight:800}
.response-workspace{position:relative;margin-top:22px;border:1px solid var(--line);border-radius:14px;background:#f8f7f3;overflow:hidden}.workspace-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 12px;border-bottom:1px solid var(--line);background:#fff}.response-tabs{display:flex;flex-wrap:wrap;gap:6px}.response-tabs button,.workspace-toolbar>button,.draw-toolbar button,.steps-title button{padding:8px 11px;border:1px solid var(--line);border-radius:8px;background:#fff}.response-tabs button[aria-selected="true"]{border-color:var(--teal);background:var(--teal2);color:var(--teal);font-weight:800}.response-workspace>.symbol-bar{margin:0;padding:9px 12px;border-bottom:1px solid var(--line);background:#fff}.response-mode{padding:16px}.response-mode .working-label{margin-top:0}.draw-toolbar{display:flex;align-items:center;gap:7px;margin-bottom:10px}.draw-toolbar button[aria-pressed="true"]{background:var(--teal2);border-color:var(--teal)}#ink-colour{width:42px;height:36px;padding:2px}#working-canvas{display:block;width:100%;height:260px;border:1px solid var(--line);border-radius:10px;background:#fff;touch-action:none;cursor:crosshair}.workspace-note{margin:9px 0 0;color:var(--muted);font-size:13px}.steps-title{display:flex;align-items:center;justify-content:space-between;gap:12px}#working-steps{padding-left:32px}#working-steps li{padding:5px 0}#working-steps input{width:100%}.annotation-labels{display:flex;flex-wrap:wrap;gap:7px;margin:12px 0}.annotation-labels button{padding:7px 10px;border:2px solid transparent;border-radius:999px;background:#e8eef5}.annotation-labels button.active{border-color:var(--ink)}.annotation-text{padding:18px;border:1px solid var(--line);border-radius:10px;background:#fff;line-height:2}.annotation-text button{margin:2px;padding:3px 5px;border:0;border-radius:5px;background:transparent}.annotation-text button[data-label]{background:#fff0ae}.calculator-panel{position:absolute;z-index:5;top:58px;right:12px;width:260px;padding:12px;border:1px solid var(--line);border-radius:12px;background:#fff;box-shadow:var(--shadow)}.calculator-panel>div:first-child{display:flex;justify-content:space-between}.calculator-panel output{display:block;margin:10px 0;padding:12px;border-radius:8px;background:var(--ink);color:#fff;text-align:right;font-size:23px}#calculator-keys{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}#calculator-keys button{padding:10px;border:1px solid var(--line);border-radius:7px;background:#f7f5ef}
/* Shared toolkit host integration */
[hidden]{display:none!important}
.language-picker{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:12px;font-weight:700}.language-picker select{padding:8px;border:1px solid var(--line);border-radius:8px;background:#fff}.teaching-actions{display:flex;justify-content:space-between;gap:10px;align-items:center}.teaching-actions>button:not(.primary),#reference-open-question{padding:9px 12px;border:1px solid var(--teal);border-radius:9px;background:#fff;color:var(--teal);font-weight:800}.reference-panel{position:fixed;z-index:60;top:96px;right:22px;width:min(520px,calc(100vw - 32px));max-height:calc(100vh - 125px);overflow:auto;padding:22px;border:1px solid var(--line);border-radius:16px;background:#fff;box-shadow:0 22px 60px rgba(16,35,63,.22)}.reference-head{display:flex;align-items:flex-start;justify-content:space-between;gap:15px}.reference-head h2{margin:3px 0}.reference-head button{width:36px;height:36px;border:1px solid var(--line);border-radius:9px;background:#fff;font-size:22px}.reference-panel>p{color:var(--muted);line-height:1.55}.reference-panel table{width:100%;border-collapse:collapse;margin:14px 0}.reference-panel th,.reference-panel td{padding:10px;border:1px solid var(--line);text-align:left;vertical-align:top}.reference-panel th{background:var(--teal2);color:var(--teal)}.reference-note{padding:12px;border-radius:9px;background:#fff5dc;color:#71501c!important}.ref-der{color:#2365a8;font-weight:850}.ref-die{color:#a33e70;font-weight:850}.ref-das{color:#087267;font-weight:850}
.activity-tool-mount{margin-top:20px}.activity-tool-mount .dsk-tool-header{display:none}.activity-tool-mount .dsk-root{box-shadow:none}.simulation-mount:has(.dsk-root){display:block;padding:0;border-style:solid;text-align:left}.simulation-mount .dsk-tool-header{border-radius:10px 10px 0 0}
.question-evidence{margin:14px 0;padding:13px 15px;border-left:5px solid var(--teal);border-radius:10px;background:var(--teal2);color:#0c514b;line-height:1.5}.question-evidence strong{display:block}.question-evidence p{margin:5px 0 0;color:inherit}
.prerequisite-bridge{margin:16px 0;padding:15px;border-radius:11px;background:#eef6fb;color:#285e7d;line-height:1.55}.prerequisite-bridge strong,.core-rule strong{display:block;margin-bottom:5px}.core-rule{margin:16px 0;padding:17px;border-left:5px solid var(--teal);border-radius:9px;background:var(--teal2);font-size:17px;line-height:1.55}.contrast-examples{display:grid;gap:8px;margin:16px 0}.contrast-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}.contrast-row span{padding:11px;border-radius:9px}.contrast-row .correct{background:#e1f3e8;color:#086a42}.contrast-row .incorrect{background:#ffe6e1;color:#9a3c2e;text-decoration:line-through}.contrast-row p{grid-column:1/-1;margin:0;color:var(--muted)}
.teach-phase,.guided-example{margin:25px 0;padding-top:20px;border-top:1px solid var(--line)}.look-for-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:10px}.look-for-card{padding:15px;border:1px solid #b8d8e9;border-radius:12px;background:#eef8fc}.look-for-card strong{display:block;color:#165d7f}.look-for-card p{margin:6px 0 0;color:var(--muted);line-height:1.45}.visual-model{padding:18px;border:2px solid #9acdc4;border-radius:14px;background:#f2fbf8}.visual-model h3{margin:0 0 5px}.visual-model>div>p{margin:0 0 14px;color:var(--muted)}.visual-items{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}.visual-item{display:flex;flex-direction:column;gap:8px;min-height:100px;padding:15px;border:2px solid #b7c8d2;border-radius:11px;background:#fff}.visual-item strong{font-size:21px;white-space:pre-wrap}.visual-item span{color:var(--muted);line-height:1.4}.visual-item.key{border-color:var(--teal);background:var(--teal2)}.visual-item.contrast{border-color:var(--coral);background:#fff0ec}.visual-item.warning{border-color:#d59b2e;background:#fff7df}.teaching-step{align-items:flex-start}.teaching-step>div{flex:1}.teaching-step h3{margin:2px 0 7px;font-size:17px}.teaching-step p{margin:4px 0;color:var(--muted);line-height:1.45}.teaching-step p strong{color:var(--ink)}.worked-example{display:grid;gap:10px}.worked-step{display:flex;gap:12px;padding:12px;border-radius:9px;background:#fff}.worked-step>b{display:grid;place-items:center;flex:0 0 27px;height:27px;border-radius:50%;background:#e8b649}.worked-step>div{display:grid;gap:6px}.worked-step code{display:block;padding:8px;border-radius:7px;background:#eef6fb;color:#174f70;font-size:16px;white-space:pre-wrap}.worked-step p{margin:0;color:var(--muted);line-height:1.45}.worked-conclusion{margin:3px 0 0;padding:12px;border-radius:8px;background:#fff0bf;font-weight:750}.guided-example{padding:20px;border:2px solid #85b9d4;border-radius:14px;background:#f3faff}.guided-example h3{margin:5px 0}.guided-example-content>p{line-height:1.5}.hint-button{padding:9px 12px;border:1px solid var(--teal);border-radius:8px;background:#fff;color:var(--teal);font-weight:800}.guided-example ol{display:grid;gap:7px;padding-left:28px}.guided-example li{padding:8px;border-radius:7px;background:#fff}.guided-check{padding:12px;border-left:4px solid var(--blue);background:#fff;font-weight:750}@media(max-width:600px){.visual-items,.look-for-grid{grid-template-columns:1fr}.visual-item{min-height:auto}}
.teach-details{margin:18px 0;border:1px solid #c9dce0;border-radius:12px;background:#fbfefd}.teach-details>summary{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:13px 15px;cursor:pointer;font-weight:850;color:var(--teal);list-style:none}.teach-details>summary::-webkit-details-marker{display:none}.teach-details>summary:after{content:"+";font-size:1.2rem;color:var(--teal)}.teach-details[open]>summary{border-bottom:1px solid var(--line)}.teach-details[open]>summary:after{content:"–"}.teach-details>summary small{color:var(--muted);font-weight:650;letter-spacing:0;text-transform:none}.teach-details .teach-phase{margin:0;padding:16px;border-top:0}
.math-worked-board{display:grid;gap:.65rem;margin:0 0 1rem;padding:1rem;border:2px solid #78b7d0;border-radius:14px;background:#f7fcff}.math-worked-line{display:grid;grid-template-columns:minmax(5rem,auto) minmax(10rem,1fr);gap:.25rem 1rem;align-items:center;padding:.65rem .75rem;border-radius:10px;background:#fff}.math-worked-line>span{font-weight:800;color:#075985}.math-worked-line>code{font:800 clamp(1.2rem,2.6vw,1.8rem)/1.35 ui-monospace,SFMono-Regular,Consolas,monospace;color:#172554;white-space:pre-wrap}.math-worked-line>small{grid-column:2;color:#475569;font-size:.9rem}@media(max-width:620px){.math-worked-line{grid-template-columns:1fr}.math-worked-line>small{grid-column:1}}