@charset "UTF-8";
:root{--bg:#f6f7f3;--paper:#fff;--ink:#263f3c;--text:#344640;--muted:#7a8681;--green:#355c53;--line:#e3e8e0;--soft:#edf3ee;--orange:#bd7355;--shadow:0 5px 22px rgba(35,58,48,.035)}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;font-size:14px;line-height:1.65}button,input,select{font:inherit}button{cursor:pointer}button,a,input,select{touch-action:manipulation}button{border:0;color:inherit}button:disabled{cursor:default;opacity:.5}a{color:var(--green)}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #bf8457;outline-offset:4px}input:focus,select:focus{outline:2px solid #9fbcad;outline-offset:2px}[hidden]{display:none!important}.skip{position:fixed;top:-100px;z-index:10;padding:10px;background:white}.skip:focus{top:10px}.topbar{height:84px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 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#dfe6d9;border-radius:8px;font-size:12px}.option-button:hover{border-color:#a2b699}.option-button.selected{border-color:var(--green);background:#edf4eb}.option-letter{width:24px;height:24px;flex:none;display:grid;place-items:center;border:1px solid #d8e0d1;border-radius:5px;font-size:11px;color:#89947e}.option-button.selected .option-letter{background:var(--green);border-color:var(--green);color:#fff}.solution-toggle{background:#fbfcf8;width:100%;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:16px 24px;text-align:left;font-size:12px;font-weight:650;color:var(--green)}.solution-toggle small{font-size:9px;font-weight:400;color:var(--muted);margin-left:6px}.solution{padding:20px 24px 25px;border-top:1px solid var(--line);background:#fdfefb}.step{display:grid;grid-template-columns:26px minmax(0,1fr);gap:11px;position:relative;padding-bottom:22px}.step:last-of-type{padding-bottom:6px}.step:not(:last-of-type):before{content:"";position:absolute;left:12px;top:29px;bottom:4px;width:1px;background:#dce5d5}.step-number{width:26px;height:26px;background:#eef4e9;border:1px solid #d7e3cf;display:grid;place-items:center;border-radius:7px;color:#6e8960;font-size:11px;position:relative}.step h4{margin:0 0 5px;font-size:12px;font-weight:650}.step-expression{font:17px/1.9 Georgia,"Microsoft JhengHei",sans-serif;color:var(--ink);word-break:break-word;white-space:pre-wrap}.step p{font-size:11px;color:#8a9483;margin:4px 0 0}.final-answer{background:#edf3e7;border:1px solid #dce7d4;border-radius:8px;padding:12px 15px;margin:16px 0;display:flex;gap:12px;align-items:center;font-size:12px}.final-answer b{font:16px Georgia,"Microsoft JhengHei",sans-serif;color:var(--green);word-break:break-word}.common-note{font-size:11px;background:#fcf5eb;border-left:3px solid #d5aa83;padding:10px 13px;color:#987853;border-radius:0 5px 5px 0}.next-row{display:flex;justify-content:space-between;align-items:center;margin-top:14px;padding:0 2px;gap:12px}.next-row p{font-size:10px;color:var(--muted);margin:0}.next-row .button{font-size:11px}.reference-card{padding:23px 22px;background:#fff;border:1px solid var(--line);border-radius:12px}.reference-card h3{font-size:15px;margin:9px 0 14px}.formula-box{background:#f4f6ee;border-radius:7px;padding:14px 12px;font:15px/1.8 Georgia,"Microsoft JhengHei",sans-serif;color:#567349;overflow-wrap:anywhere}.reference-card>p{font-size:11px;color:#849177;line-height:1.9;margin:11px 0 0}.reference-divider{height:1px;background:var(--line);margin:23px 0 18px}.reference-card h4{font-size:11px;font-weight:650;margin:0 0 12px}.reference-card ol{padding:0;list-style:none;margin:0;counter-reset:habits}.reference-card li{position:relative;padding-left:24px;margin:12px 0;font-size:11px}.reference-card li:before{counter-increment:habits;content:counter(habits,decimal-leading-zero);position:absolute;left:0;top:0;color:#a3ae97;font-size:9px}.reference-card li b{font-weight:550}.reference-card li span{display:block;font-size:10px;color:var(--muted);margin-top:2px}.input-note{display:flex;gap:10px;padding:21px 12px}.input-note>span{font-size:22px;color:#a4ad98;line-height:1.3}.input-note h4{margin:0 0 8px;font-size:11px}.input-note p{font-size:10px;color:var(--muted);line-height:2;margin:0}.input-note code{color:#6a805f;background:#eef1e9;border-radius:3px;padding:2px 4px;font-size:9px}.input-note small{font-size:9px;color:#a1ab96}.local-note{font-size:9px;color:#a1ab96;padding:0 12px;margin:2px 0}.notes-card{background:white;border:1px solid var(--line);border-radius:12px;padding:23px;margin-bottom:14px}.notes-card h3{font-size:16px;margin:0 0 16px}.notes-entry{padding:14px 0;border-top:1px solid var(--line)}.notes-entry h4{font-size:12px;margin:0 0 7px;display:flex;justify-content:space-between;align-items:center}.notes-entry button{font-size:10px;color:var(--green);background:#edf3e7;padding:5px 9px;border-radius:5px}.notes-entry .math{font:16px Georgia,"Microsoft JhengHei",sans-serif;line-height:1.8}.notes-entry p{font-size:11px;color:var(--muted);margin:5px 0 0}.empty-state{padding:48px 30px;text-align:center;background:white;border:1px solid var(--line);border-radius:12px}.empty-state h3{font-size:20px;margin:0 0 10px}.empty-state p{color:var(--muted);font-size:12px;margin-bottom:22px}footer{border-top:1px solid var(--line);margin-top:35px;padding:20px 0;display:flex;gap:20px;justify-content:space-between;font-size:9px;color:#98a290}footer details{max-width:380px}footer summary{cursor:pointer;color:#85927c}footer p{line-height:1.9}dialog{border:1px solid var(--line);border-radius:13px;padding:25px;max-width:400px;width:90%;color:var(--text);box-shadow:0 16px 50px #1b332633}dialog::backdrop{background:#1e35264d}dialog h3{margin:0 0 8px}dialog p{font-size:12px;color:var(--muted);margin:0 0 22px}dialog>div{display:flex;gap:8px;justify-content:flex-end}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);z-index:6;padding:12px 20px;border-radius:8px;background:var(--ink);color:white;box-shadow:0 5px 20px #233c2e20;font-size:12px;max-width:90vw}.teacher main{max-width:none}.teacher .reference-column,.teacher .hero,.teacher .session-strip{display:none}.teacher .workspace-grid{grid-template-columns:1fr}.teacher .question-prompt{font-size:37px}.teacher .question-prompt.wordy{font-size:29px}.teacher .step-expression{font-size:26px}.teacher .step p,.teacher .step h4{font-size:16px}.teacher .question-body{padding:30px}.teacher .diagram svg{height:270px}.teacher .answer-field input{font-size:26px}.teacher .question-instruction{font-size:14px}.teacher .question-card{max-width:1000px}.teacher .topbar #teacher{background:#e6efe1;border-color:#b8cbb0}
@media(min-width:1600px){main{padding:35px 50px}.hero{padding:38px 45px}.hero h1{font-size:43px}.workspace-grid{grid-template-columns:minmax(0,1fr) 290px}.sidebar{padding-top:36px}}
@media(max-width:1250px){.layout{grid-template-columns:215px minmax(0,1fr)}main{padding:25px}.workspace-grid{grid-template-columns:minmax(0,1fr) 225px;gap:17px}.hero{padding:27px 29px}.hero-art{width:240px}.hero-art svg{width:230px}.hero h1{font-size:35px}.filter-label{gap:7px}.level-label{margin-left:0}.reference-card{padding:19px 17px}.sidebar{padding:25px 12px}.filter-label select{min-width:140px}.filter-label .level-label{margin-top:4px}}
@media(max-width:1050px){.workspace-grid{grid-template-columns:1fr}.reference-column{display:grid;grid-template-columns:1fr 1fr;gap:18px}.reference-card{padding:20px}.reference-divider,.reference-card h4,.reference-card ol{display:none}.local-note{display:none}.input-note{padding:17px 12px}.hero-art{width:210px}.hero-art svg{width:215px}.hero h1{font-size:32px}.hero p{font-size:11px}.session-strip{padding:14px 16px}.session-strip>div{gap:8px;margin-right:14px}.session-strip b{font-size:16px}.session-strip .text-button{font-size:9px}.workspace-head h2{font-size:20px}}
@media(max-width:760px){.topbar{height:72px;padding:0 18px}.brand{font-size:17px;gap:9px}.brand-mark{width:34px;height:34px;font-size:25px}.brand small{font-size:8px}.top-right{gap:10px}.private-pill{display:none}.topbar .button{font-size:10px;padding:8px 11px;min-height:37px}.layout{display:block}.sidebar{position:static;height:auto;overflow:visible;padding:12px 16px;border-right:0;border-bottom:1px solid var(--line)}.side-intro,.side-bottom{display:none}#unit-nav{display:flex;overflow-x:auto;gap:7px;padding:2px 0 7px;align-items:stretch}.semester-group{display:contents}.semester-label{display:none}.unit-button{width:auto;min-width:132px;max-width:165px;padding:9px 10px;margin:0;background:#fff;border-color:var(--line);gap:7px;font-size:10px}.unit-button .unit-number{height:24px;width:24px}.unit-button small{font-size:8px}.unit-arrow{display:none}.mistakes-button{display:inline-flex;width:auto;margin-top:3px;border:0;padding:4px 6px;gap:7px;font-size:10px}.mistakes-button small{display:none}.mistakes-button>span:first-child{font-size:18px}main{padding:20px 16px}.hero{padding:25px 25px 24px;border-radius:12px}.hero h1{font-size:29px;margin-top:12px}.hero-art{width:170px;align-self:center}.hero-art svg{width:180px}.art-note{font-size:7px}.hero-tags{gap:5px;margin-top:15px}.hero-tags span{font-size:8px}.hero .eyebrow{font-size:8px}.hero p{font-size:10px}.session-strip{padding:13px;margin:14px 0 23px}.session-strip>div{gap:7px;padding-right:9px;margin-right:9px}.session-strip .stat-icon{font-size:18px}.session-strip b{font-size:15px}.session-strip small{font-size:8px}.session-strip .text-button{font-size:8px;margin-left:4px}.workspace-head{align-items:flex-start}.workspace-head h2{font-size:19px;letter-spacing:0}.workspace-head .eyebrow{font-size:8px}.workspace-head p{font-size:10px}.view-switch{padding:3px;margin-top:8px}.view-switch button{padding:6px 8px;font-size:9px}.filters{padding:15px}.filter-label select{max-width:none}.filter-label{row-gap:10px}.question-body{padding:20px}.question-card-head{padding:17px 20px 0}.question-prompt{font-size:24px}.question-prompt.wordy{font-size:17px}.question-instruction{font-size:10px}.q-meta .q-no{font-size:9px}.q-type{font-size:9px}.answer-actions .button{font-size:10px;padding:10px 13px}.hint-toggle{font-size:10px}.solution,.solution-toggle{padding-left:20px;padding-right:20px}.step-expression{font-size:16px}.reference-column{grid-template-columns:1fr 1fr;gap:9px}.reference-card{padding:17px}.formula-box{font-size:13px;padding:10px}.reference-card h3{font-size:13px}.input-note{padding:15px 5px;gap:7px}.input-note>span{font-size:18px}.next-row p{font-size:9px}.next-row .button{font-size:10px;padding:9px 12px}footer{font-size:8px;margin-top:25px;gap:10px}.teacher .question-prompt{font-size:29px}.teacher .question-prompt.wordy{font-size:23px}.teacher .step-expression{font-size:22px}.teacher .step p,.teacher .step h4{font-size:13px}.teacher .question-body{padding:22px}}
@media(max-width:430px){.hero-art{display:none}.hero h1 br{display:none}.hero h1{font-size:29px;letter-spacing:.04em}.hero p br{display:none}.hero{padding:23px}.hero p{font-size:11px}.session-strip .stat-icon{display:none}.session-strip small{font-size:8px}.session-strip>div{padding-right:7px;margin-right:7px}.session-strip b{font-size:14px}.workspace-head{display:block}.view-switch{display:inline-flex;margin-top:12px}.workspace-head h2{font-size:21px}.filter-label label{display:none}.filter-label select{width:100%;flex-basis:100%}.level-label{display:none}.level-switch{width:100%}.level-switch button{flex:1;min-height:32px}.type-chip{font-size:10px;padding:5px 8px}.answer-grid{grid-template-columns:1fr}.answer-actions{gap:7px}.hint-toggle{margin-left:0}.solution-toggle small{display:none}.reference-column{grid-template-columns:1fr}.input-note{border-top:1px solid var(--line);padding:14px 10px}.input-note p br{display:none}.input-note p{line-height:2.4}.input-note p code{margin-right:7px}.question-prompt.wordy{font-size:16px}.diagram svg{height:165px}footer{display:block}footer details{margin-top:8px}}
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.unit-group{margin:2px 0}.unit-header{display:flex;align-items:stretch;border:1px solid transparent;border-radius:10px;overflow:hidden}.unit-header.active{background:#e8f0e9;border-color:#d2dfd3}.unit-header .unit-button{flex:1;min-width:0;width:auto;margin:0;border:0;border-radius:0}.unit-header .unit-button.active{border:0;background:none}.unit-expand{width:31px;flex:none;background:transparent;font:24px Georgia;color:#889b7c;display:grid;place-items:center;min-height:40px}.unit-expand:hover{background:#e5eddf}.unit-expand.open{transform:rotate(90deg)}.unit-subsections{padding:5px 4px 9px 36px;display:grid;gap:3px}.unit-subsections button{background:transparent;border-left:1px solid #dce5d4;padding:7px 9px;text-align:left;font-size:10px;line-height:1.65;color:#8a987e;border-radius:0 5px 5px 0;white-space:normal}.unit-subsections button:hover,.unit-subsections button.active{background:#edf3e7;color:#527445;border-left-color:#90aa7a}@media(max-width:760px){#unit-nav{align-items:flex-start}.unit-group{flex:none;width:152px;max-width:165px;margin:0}.unit-header{border-color:var(--line);background:#fff}.unit-header .unit-button{min-width:0;max-width:none;flex:1;padding:9px 7px;font-size:10px}.unit-expand{width:26px;font-size:21px}.unit-subsections{padding:6px 2px 4px 9px}.unit-subsections button{font-size:9px;padding:6px}.unit-header .unit-number{width:21px;height:21px;flex:none}}