:root{--bg:#f8f7fc;--ink:#272338;--muted:#736d82;--purple:#7761d6;--pale:#efebfb;--line:#e8e4f0;--green:#417951;--card:#fff;--radius:22px;font-family:Inter,-apple-system,BlinkMacSystemFont,'Apple SD Gothic Neo','Malgun Gothic',sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button,a,input,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.48}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #a590ea;outline-offset:4px}a{color:inherit;text-decoration:none}button{color:inherit}button svg{flex-shrink:0}svg{vertical-align:middle}h1,h2,h3,p{margin:0}h1,h2,h3{letter-spacing:-.04em}p{line-height:1.8}button{border:0;background:none}small,.muted{color:var(--muted)}.skip{position:fixed;top:-60px;padding:16px;background:white;z-index:100}.skip:focus{top:0}.shell{max-width:1240px;padding:0 42px;margin:auto}.topbar{height:96px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:24px}.brand{display:flex;align-items:center;gap:11px;flex-shrink:0}.brand-icon{background:var(--purple);width:39px;height:39px;border-radius:12px;padding:8px}.brand strong{font-size:21px;letter-spacing:-1px}.brand small{font-size:10px;letter-spacing:1.4px;display:block;margin-top:4px}.nav{display:flex;gap:30px;align-items:center;height:100%}.nav button{font-size:14px;font-weight:600;color:var(--muted);height:100%;border-bottom:2px solid transparent;padding:0 2px;display:flex;align-items:center;gap:7px}.nav button.active{color:var(--purple);border-color:var(--purple)}.profile{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted)}.profile-badge{background:#e7f0df;color:#648049;display:grid;place-items:center;width:34px;height:34px;border-radius:50%;font-size:17px}.main{padding:42px 0 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var(--line)}.stat:last-child{border:0}.stat-icon{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:#f3effe;color:var(--purple)}.stat-icon.green{color:#6c8b4d;background:#edf4e5}.stat-icon.orange{color:#b28549;background:#faf1e3}.stat small{font-size:11px;display:block;margin-bottom:5px}.stat strong{font-size:21px;font-weight:650}.stat strong span{font-size:11px;color:var(--muted);font-weight:400;margin-left:5px}.section-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:17px;gap:16px}.section-head h2{font-size:19px}.section-head p{font-size:12px;color:var(--muted);margin-top:7px}.dashboard-grid{display:grid;grid-template-columns:1.65fr 1fr;gap:22px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}.lesson-feature{position:relative;overflow:hidden}.tag{font-size:10px;padding:5px 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15px;background:var(--pale);border-radius:14px;text-align:center;font-size:28px;margin:24px 0;color:#615092;overflow-wrap:anywhere}.example{border-left:3px solid #cfc0ee;padding:3px 0 3px 18px;margin:22px 0}.example small{font-size:11px;display:block;color:var(--purple);font-weight:700;margin-bottom:6px}.example p{margin:0;font-size:13px}.lesson-controls{display:flex;justify-content:space-between;gap:15px;margin-top:20px;align-items:center}.lesson-controls span{font-size:11px;color:var(--muted)}.proof-slots{display:flex;flex-direction:column;gap:10px;margin:20px 0}.proof-card{padding:15px 17px;background:#f8f6fc;border:1px solid #e0d7ef;border-radius:11px;width:100%;display:flex;gap:13px;align-items:center;text-align:left;font-size:13px;line-height:1.8}.proof-card .index{color:var(--purple);font-weight:700;flex-shrink:0}.proof-card .remove{margin-left:auto;color:#9b90ac;font-size:18px}.proof-bank{display:flex;flex-direction:column;gap:9px;margin:20px 0}.proof-bank 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var(--line);border-radius:10px;background:white;text-align:left;font-size:13px;line-height:1.65;width:100%}.option:hover{background:#faf8fe;border-color:#beace1}.option .letter{width:22px;height:22px;display:grid;place-items:center;border-radius:6px;background:#f4f1f9;color:#8e829e;flex-shrink:0;font-size:10px}.option.correct{border-color:#a5c490;background:#f1f7ed}.option.wrong{border-color:#ddb792;background:#fff5eb}.option.chosen{border-color:var(--purple);background:var(--pale)}.code-block{background:#272535;border-radius:14px;overflow:hidden;margin:18px 0 24px;color:#e3dff1}.code-label{padding:11px 20px;border-bottom:1px solid #423d50;color:#baaccf;font-size:10px;display:flex;justify-content:space-between}.code-block pre{padding:22px;font:13px/1.9 ui-monospace,SFMono-Regular,Menlo,monospace;overflow:auto;margin:0;white-space:pre;tab-size:4}.note-input{width:100%;min-height:170px;border:1px solid #dcd4ec;padding:17px;background:#fcfbfe;border-radius:13px;resize:vertical;font-size:14px;line-height:1.9;color:var(--ink)}.check-row{display:flex;gap:10px;align-items:flex-start;font-size:13px;line-height:1.8;margin:16px 0}.check-row input{width:17px;height:17px;margin-top:3px;accent-color:var(--purple);flex-shrink:0}.completion{padding:28px;text-align:center;border-radius:16px;background:#f0f5e9;margin-top:23px}.completion h3{font-size:21px;color:#576f40}.completion p{font-size:13px;margin:12px 0 20px}.notes-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px;margin-top:25px}.note-card h3{font-size:17px;margin:12px 0}.note-card p{font-size:13px;white-space:pre-wrap;overflow-wrap:anywhere;color:#70647e;max-height:180px;overflow:auto}.note-card small{font-size:10px}.notes-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.empty{padding:50px 25px;text-align:center;background:white;border:1px dashed #ded5ec;border-radius:20px;margin-top:25px}.empty h2{font-size:20px;margin:16px 0 10px}.empty p{font-size:13px;color:var(--muted);margin-bottom:20px}.review-summary{display:flex;gap:15px;align-items:center;justify-content:space-between;margin:25px 0;padding:20px 25px;background:var(--pale);border-radius:16px;font-size:13px;line-height:1.7}.diagnostic{max-width:720px;margin:0 auto}.diagnostic .card{margin-top:24px}.diag-progress{height:5px;border-radius:10px;background:var(--line);margin:24px 0}.diag-progress i{height:100%;background:var(--purple);display:block;border-radius:10px}.banner{font-size:12px;line-height:1.8;padding:14px 18px;background:#fff3e6;border:1px solid #e5c6a4;border-radius:12px;color:#8b6437;margin-bottom:20px}#toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,25px);background:#30283e;color:white;border-radius:12px;box-shadow:0 8px 25px #30283e25;padding:13px 22px;max-width:90vw;font-size:13px;opacity:0;pointer-events:none;transition:all .2s;z-index:100}#toast.visible{opacity:1;transform:translate(-50%,0)}dialog{border:1px solid var(--line);border-radius:20px;padding:28px;max-width:440px;width:90%;color:var(--ink)}dialog::backdrop{background:#20192b66}dialog h2{font-size:21px;margin-bottom:12px}dialog p{font-size:13px;color:var(--muted);margin-bottom:20px}.dialog-actions{display:flex;gap:10px;justify-content:flex-end}.page-actions{display:flex;justify-content:space-between;align-items:center;gap:15px}.page-actions .button{flex-shrink:0}.storage-note{font-size:11px;color:var(--muted);margin-top:20px;line-height:1.8}.stage-mini:nth-child(n+5){display:none}
@media(min-width:1500px){.shell{max-width:1320px}.hero{min-height:310px}.hero h2{font-size:36px}}
@media(max-width:900px){.shell{padding:0 24px}.profile span{display:none}.hero{padding:30px;grid-template-columns:1.2fr 1fr}.hero h2{font-size:29px}.hero-art svg{width:260px}.nav{gap:20px}.dashboard-grid{grid-template-columns:1.45fr 1fr}.card{padding:23px}.lesson-layout{grid-template-columns:150px 1fr;gap:20px}.lesson-panel{padding:26px}.path-stage{grid-template-columns:180px 1fr}.stat{padding:0 17px}}
@media(max-width:650px){.shell{padding:0 20px}.topbar{height:auto;min-height:124px;flex-wrap:wrap;gap:0;padding-top:20px;position:relative}.brand strong{font-size:20px}.brand small{font-size:9px}.brand-icon{width:34px;height:34px;border-radius:10px}.profile{position:absolute;right:0;top:22px}.profile-badge{width:31px;height:31px}.nav{order:3;width:100%;height:52px;gap:0;justify-content:space-between;margin-top:12px}.nav button{font-size:12px;flex:1;justify-content:center}.nav svg{width:14px}.main{padding:27px 0 35px}.greeting{margin-bottom:20px}.greeting h1{font-size:22px}.greeting p{font-size:12px}.date{display:none}.hero{padding:26px;display:block;min-height:330px}.hero h2{font-size:27px;position:relative;z-index:1}.hero p{max-width:255px;font-size:12px;position:relative;z-index:1}.hero .button{margin-top:22px;position:relative;z-index:2}.hero-art{position:absolute;width:165px;height:130px;bottom:4px;right:-20px;opacity:.6}.hero-art svg{width:175px}.hero-note{display:none}.stats{padding:18px 0;margin:17px 0 27px}.stat{gap:7px;padding:0 12px;display:block}.stat-icon{display:none}.stat small{font-size:10px}.stat strong{font-size:22px}.stat strong span{font-size:9px;margin-left:3px}.section-head h2{font-size:18px}.dashboard-grid{grid-template-columns:1fr;gap:17px}.card{padding:24px}.lesson-feature h3{font-size:23px}.side-card{display:none}.preview-proof{padding:17px 10px;gap:8px}.preview-proof .formula{font-size:20px}.preview-proof small{font-size:9px;max-width:105px}.stages-mini{grid-template-columns:1fr 1fr;gap:11px}.stage-mini{padding:16px;min-height:140px}.stage-mini h3{font-size:13px}.footer{display:block;font-size:10px}.footer span{display:block;margin-bottom:7px}.path-stage{display:block;padding-top:24px;margin-top:22px}.path-stage>div:first-child{margin-bottom:18px}.path-stage h2{font-size:20px}.lesson-row{padding:15px;gap:11px}.lesson-row .end{font-size:10px;gap:5px}.lesson-row h3{font-size:13px}.lesson-row p{font-size:10px}.intro-title{font-size:27px}.intro-copy{font-size:12px}.page-actions{display:block}.page-actions .button{margin-top:17px}.lesson-top{align-items:flex-start;margin-bottom:20px}.lesson-top h1{font-size:21px}.lesson-top>.text-btn{font-size:10px}.lesson-layout{display:block}.steps-nav{position:static;display:grid;grid-template-columns:repeat(3,1fr);gap:6px;margin-bottom:18px}.steps-nav button{padding:9px 7px;font-size:10px;gap:6px;margin:0}.steps-nav button .step-num{width:20px;height:20px;font-size:9px}.steps-tip{display:none}.lesson-panel{padding:23px 20px;min-height:340px}.lesson-panel h2{font-size:21px}.lesson-panel p{font-size:13px}.lesson-panel .formula-box{font-size:23px;padding:23px 10px}.proof-card{font-size:12px;padding:12px;gap:8px}.proof-card .remove{font-size:16px}.option{font-size:12px;padding:12px;gap:8px}.quiz-card h3{font-size:14px}.code-block pre{font-size:11px;padding:17px}.lesson-controls{flex-wrap:wrap}.lesson-controls span{font-size:10px}.notes-grid{grid-template-columns:1fr}.review-summary{padding:18px;gap:10px;font-size:12px}.review-summary .button{font-size:11px;min-width:100px}.card-foot .button{padding:10px 13px}.card-foot small{font-size:10px}.notes-actions .button{font-size:12px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.main:focus{outline:none}
@media(max-width:650px){.footer span{display:inline}.footer>span{display:block;margin-bottom:7px}}
/* Guided learning, references and term dictionary */
.connection-card{border-left:3px solid #90ad79;background:#f0f5e9;border-radius:0 14px 14px 0;padding:22px 25px;margin-bottom:20px}.connection-card p{font-size:14px;line-height:1.9;margin:10px 0}.connection-card small{line-height:1.8}.connection-card a{color:#526b3e;text-decoration:underline;text-underline-offset:3px}.term-tools{background:#f0edf8;border:1px solid #e2dbee;border-radius:15px;padding:18px 20px;margin-bottom:20px}.term-tools>div:first-child{display:flex;justify-content:space-between;align-items:center;gap:12px}.term-tools strong{font-size:13px}.term-tools small{display:block;font-size:11px;color:#777085;margin-top:12px}.term-chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}.term-chips button{border:1px solid #ddd4ed;background:white;border-radius:9px;padding:7px 10px;display:flex;gap:8px;align-items:center;color:#665382}.term-chips b{font-family:Georgia,serif;font-size:17px}.term-chips span{font-size:11px}.inline-term{display:inline;background:transparent;border:0;border-bottom:1px dashed #9482b9;padding:0;color:#7055a0;font:inherit;cursor:help;line-height:inherit}.inline-term:hover{background:#ece5fa}.lead-explanation{font-size:18px!important;color:#40354f!important;line-height:2!important}.worked-example{padding-left:24px;line-height:2}.worked-example li{padding:10px 0 14px 8px;border-bottom:1px solid #eee9f5;font-size:15px}.guide-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;border-top:1px solid #eee9f5;padding-top:22px;margin-top:28px}.guide-actions>span{font-size:12px;color:#777}.checkpoint{margin-top:26px;padding:20px;background:#faf9fc;border:1px solid #e9e3f3;border-radius:12px}.checkpoint h3{font-size:14px;color:#7b6695}.checkpoint p{margin-top:12px}.proof-dots{display:flex;gap:10px;margin:20px 0}.proof-dots button{border:1px solid #dbd2e8;background:white;border-radius:50%;width:36px;height:36px;color:#766386}.proof-dots button.active{background:#8066c4;color:white}.guided-equation{background:#f0edf8;border-radius:12px;padding:26px 22px;font-size:21px;line-height:1.7;color:#604887;overflow-wrap:anywhere}.proof-explanation{margin-top:24px}.proof-explanation h3{font-size:16px}.lesson-references{margin-top:32px;border-top:1px solid #e2ddec;padding-top:22px;font-size:12px;line-height:1.8;color:#736b80}.lesson-references h3{font-size:14px;color:#594c68}.lesson-references p{font-size:12px;line-height:1.8}.lesson-references ul{padding-left:18px}.lesson-references li{margin:12px 0}.lesson-references li small{display:block}.lesson-references a,.note-card a{color:#7257a5;text-decoration:underline;text-underline-offset:4px}.term-dialog{width:min(560px,calc(100vw - 32px));max-height:85vh;overflow:auto;padding:28px;border:1px solid #d4c8e5;border-radius:20px;color:#43364e;box-shadow:0 20px 80px #21133633}.term-dialog::backdrop{background:#30283d66;backdrop-filter:blur(3px)}.term-top{display:flex;align-items:center;justify-content:space-between;gap:16px}.term-close{border:0;background:#f0ebf7;width:35px;height:35px;border-radius:50%;font-size:25px;color:#715590;flex-shrink:0}.term-dialog h2{font-size:23px;margin:18px 0}.term-symbol{padding:22px;background:#f3effa;border-radius:12px;text-align:center;font:30px Georgia,serif;overflow-wrap:anywhere}.term-dialog dt{font-size:12px;color:#8e79a4;margin-top:22px}.term-dialog dd{margin:8px 0 0;line-height:1.9;font-size:15px}.term-links{display:flex;gap:10px;flex-wrap:wrap;margin:25px 0 18px}.term-dialog small{color:#888;font-size:11px;line-height:1.8}.term-dialog input{width:100%;padding:12px;border:1px solid #cfc3e1;border-radius:8px;margin:10px 0}.dictionary-row{width:100%;display:flex;gap:18px;align-items:center;padding:15px;border:0;border-bottom:1px solid #eee;background:white;text-align:left;color:#66527e}.dictionary-row strong{width:100px;overflow-wrap:anywhere}.advanced-lab{border:1px solid #e1d9ed;border-radius:14px;padding:22px;background:#fcfbfe}.lab-controls{display:grid;grid-template-columns:1fr 1fr;gap:17px}.lab-controls label{font-size:12px;line-height:1.8}.lab-controls output{float:right;color:#7755ae;font-weight:700}.lab-controls input{display:block;width:100%;margin:9px 0;accent-color:#8066c4}.lab-result{padding:20px;margin-top:18px;background:#eee8f7;border-radius:10px;color:#665080;font-size:17px;line-height:1.8;overflow-wrap:anywhere}.lab-graph svg{width:100%;height:auto;max-height:310px;margin-top:15px}.lab-graph svg text{font-size:12px;fill:#aaa}.advanced-lab small{font-size:10px;color:#999}.lab-explain{font-size:13px!important}.lab-bars{display:grid;gap:14px;margin:22px 0}.lab-bars>div{display:grid;grid-template-columns:1fr 2fr auto;gap:10px;align-items:center;font-size:12px}.lab-bars>div>div{height:16px;background:#ece7f3;border-radius:4px;overflow:hidden}.lab-bars i{display:block;height:100%;background:#9a80ce}.lab-bars b{min-width:65px;text-align:right;font-size:11px}.topbar{gap:18px}.nav{gap:3px}.nav button{padding:10px 12px;font-size:12px}.profile{display:none}.stages-mini{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.long-view{background:#f0f5eb;border-radius:18px;padding:26px 30px;margin:28px 0}.long-view h3{font-size:20px;margin-bottom:12px}.long-view p{font-size:14px;line-height:1.9;color:#5d6755}.track-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin:24px 0}.track-cards button{padding:22px;border:1px solid #e0d8ec;border-radius:14px;background:white;text-align:left;color:#685482}.track-cards strong{display:block;font-size:17px;margin-bottom:8px}.track-cards small{line-height:1.8}.steps-nav button:disabled{opacity:.42;cursor:not-allowed}.footer>span:last-child{display:flex;align-items:center;gap:8px}.button:disabled{cursor:not-allowed;opacity:.45}
@media(max-width:720px){.topbar{flex-wrap:wrap}.nav{width:100%;justify-content:space-between;gap:0}.nav button{padding:10px 5px;font-size:11px;gap:4px}.nav svg{display:none}.brand strong{font-size:19px}.track-cards{grid-template-columns:1fr}.guide-actions{flex-wrap:wrap}.guide-actions .button{font-size:12px;padding:12px}.lab-controls{grid-template-columns:1fr}.advanced-lab{padding:15px}.guided-equation{font-size:18px;padding:20px 16px}.term-tools{padding:15px}.term-tools .text-btn{font-size:11px}.term-dialog{padding:22px}.long-view{padding:22px}.footer{align-items:flex-start;gap:10px;flex-direction:column}.checkpoint{padding:16px}.lead-explanation{font-size:16px!important}.stages-mini{grid-template-columns:repeat(2,minmax(0,1fr))}.lab-bars>div{grid-template-columns:1fr 1.2fr auto}}