:root{font-family:Noto Sans SC,system-ui,sans-serif;color:#263d31;background:#f8f9f5;font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #d99b48;outline-offset:4px}header{height:86px;border-bottom:1px solid #e4e8df;display:flex;align-items:center;justify-content:space-between;padding:0 5.5%}.brand{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:700;text-decoration:none;color:inherit}.brand-icon{background:#335d46;color:#fff;border-radius:12px;font-size:28px;width:41px;height:41px;text-align:center;line-height:38px}.badge{font-size:11px;letter-spacing:1px;background:#e9eee2;color:#63765e;padding:5px 9px;border-radius:5px;margin-left:7px}.header-note{font-size:12px;color:#8b9486}main{max-width:1440px;margin:auto;padding:34px 5.5% 0}.eyebrow{font-size:11px;letter-spacing:1.5px;color:#809078;font-weight:600}.eyebrow span{margin:0 13px;color:#b6bfae}.title-row{display:flex;align-items:center;justify-content:space-between;margin:12px 0 25px}h1{font-size:34px;letter-spacing:-1px;margin:0 0 10px;font-weight:800}h1 span{color:#739264}.subtitle{color:#879080;font-size:13px;margin:0}.lesson-tag{font-size:12px;border:1px solid #dce3d5;padding:8px 13px;border-radius:20px;color:#6b7e63}.problem{display:flex;align-items:center;gap:15px;background:#edf1e7;border:1px solid #e0e6d8;padding:15px 20px;border-radius:12px;margin-bottom:23px}.problem-icon{display:grid;place-items:center;background:#dbe5cf;color:#5c7651;border-radius:50%;height:28px;width:28px;font-weight:700}.problem p{font-size:13px;line-height:1.9;margin:0;flex:1}.problem strong{color:#46693e}.problem-label{font-size:11px;color:#8b987d}.mobile-break{display:none}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:22px}.experiment{border:1px solid #e0e5d9;border-radius:16px;overflow:hidden;background:#f1f3ed;display:flex;flex-direction:column}.scene-toolbar{height:55px;padding:0 20px;display:flex;align-items:center;justify-content:space-between;font-size:12px}.live-dot{display:inline-block;width:6px;height:6px;background:#72976c;border-radius:50%;margin-right:8px}.view-buttons{display:flex;gap:6px}.view-buttons button{border:1px solid #dce2d5;border-radius:6px;padding:6px 10px;background:#ffffff80;color:#798670;font-size:10px}#viewport{height:380px;min-height:300px;position:relative;flex:1}canvas{display:block;touch-action:none}.scene-tip{position:absolute;top:10px;left:20px;font-size:10px;color:#99a18f;pointer-events:none}.scene-legend{position:absolute;bottom:15px;left:20px;display:flex;gap:20px;font-size:10px;color:#85907c;pointer-events:none}.scene-legend span{display:flex;align-items:center;gap:6px}.swatch{width:9px;height:9px;border-radius:2px}.wood{background:#d9b580}.orange{background:#ee9959}#labels{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;overflow:hidden}.world-label{position:absolute;transform:translate(-50%,-50%);white-space:nowrap}.stick-label{font-size:11px;color:#78613e;font-weight:500}.joint-label{font-size:10px;color:#b36329;background:#fff1df;border:1px solid #efc797;padding:5px 8px;border-radius:6px}.length-label{font-size:13px;font-weight:700;color:#41674b;background:#f1f3ed;padding:4px 12px}.ruler-label{font-size:9px;color:#97a28b}.playback{display:flex;align-items:center;gap:16px;padding:18px 21px;background:#fff;border-top:1px solid #e4e8de}.play-button{width:39px;height:39px;border:0;border-radius:50%;background:#3d664a;color:#fff}.timeline{flex:1}.timeline-top{display:flex;justify-content:space-between;font-size:11px;margin-bottom:6px}.timeline-top span{color:#8a9782;font-size:10px}input[type=range]{width:100%;height:5px;accent-color:#5d8053;cursor:pointer;display:block}.restart{border:0;background:transparent;font-size:11px;color:#7d8974}.explanation{background:#fff;border:1px solid #e3e7de;border-radius:16px;padding:24px;display:flex;flex-direction:column}nav{display:flex;gap:6px;margin:20px 0 22px}nav button{padding:0;border:0;background:transparent;color:#a2ac9c;font-size:0;flex:1}nav button span{display:grid;place-items:center;font-size:12px;width:30px;height:30px;border-radius:50%;background:#f0f3ec;margin:auto}nav button.active span{background:#3e674a;color:#fff;box-shadow:0 0 0 4px #eff3e9}nav button.done span{background:#e2ebda;color:#5e7d51}.lesson-copy{min-height:151px}#step-kicker{color:#8b9c7d;font-size:10px}h2{font-size:19px;line-height:1.6;margin:8px 0 10px}.lesson-copy p{font-size:12px;color:#85907c;line-height:1.95;margin:0}.formula-card{background:#f5f7f0;border-radius:10px;padding:15px 16px;margin:18px 0}.card-label{font-size:10px;color:#98a08d}#formula{font-size:20px;font-weight:600;line-height:1.7;margin:9px 0 5px;font-variant-numeric:tabular-nums;letter-spacing:-.5px}#formula em{font-style:normal;color:#ce8345}#formula span{color:#94a087}#formula strong{font-size:29px;color:#486d3e}#formula-note{font-size:10px;color:#8a967c;margin:0;line-height:1.8}.next-button{background:#3c6348;color:#fff;border:0;border-radius:8px;padding:12px 15px;font-size:12px;text-align:left;margin-top:auto}.next-button span{float:right}.bottom-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin:24px 0 30px}.discovery,.try{border:1px solid #e2e6db;border-radius:12px;padding:20px 22px;display:flex;gap:16px;align-items:center}.small-icon{color:#8c9b60;font-size:28px;align-self:flex-start}h3{font-size:13px;margin:0 0 9px}.bottom-grid p{font-size:11px;line-height:1.9;color:#88917f;margin:0}.bottom-grid strong{font-weight:500;color:#607451}.try{justify-content:space-between;background:#f1f4eb}.overlap-control{min-width:135px;width:38%}.overlap-control label{display:flex;justify-content:space-between;font-size:10px;color:#869577;margin-bottom:12px}.overlap-control strong{color:#4a6c40;font-size:12px}.range-ends{display:flex;justify-content:space-between;font-size:9px;color:#9ca68f;margin-top:7px}footer{border-top:1px solid #e5e9df;display:flex;justify-content:space-between;padding:19px 0;color:#a2aa98;font-size:10px}.fallback{padding:40px;font-size:14px}@media(min-width:1500px){#viewport{min-height:440px}}@media(max-width:1050px){main{padding:25px 4% 0}.workspace{grid-template-columns:minmax(0,1fr) 280px}.explanation{padding:20px}h1{font-size:28px}.bottom-grid{grid-template-columns:1fr}.header-note{display:none}}@media(max-width:720px){header{height:68px;padding:0 5%}.brand{font-size:16px}.badge{font-size:9px;margin:0}.title-row{margin-bottom:20px}h1{font-size:25px}.lesson-tag{display:none}.problem{padding:12px;gap:10px}.problem p{font-size:12px}.problem-label{display:none}.workspace{grid-template-columns:1fr;gap:15px}#viewport{height:310px}.explanation{padding:20px}nav{margin:15px 0}nav button{font-size:10px;line-height:2.5}.lesson-copy{min-height:0}.formula-card{margin:15px 0}.bottom-grid{margin-top:15px;gap:15px}.try{flex-wrap:wrap}.overlap-control{width:100%}footer span:nth-child(2){display:none}.scene-legend{gap:12px}.subtitle{font-size:12px}.problem-icon{flex-shrink:0}}[hidden]{display:none!important}.unit-heading{display:flex;justify-content:space-between;gap:10px;font-size:13px}.unit-heading>span{font-size:10px;color:#85907c}.unit-toggle{display:flex;gap:8px;margin:14px 0}.unit-toggle button{border:1px solid #dce3d5;background:#fff;border-radius:7px;padding:7px 10px;color:#70826a;font-size:11px}.unit-toggle button[aria-pressed=true]{background:#3e674a;color:#fff;border-color:#3e674a}#unit-lab{padding:18px 22px;background:#fffdf7;border-block:1px solid #e4e8de}.unit-stick{background:repeating-linear-gradient(0deg,#dcb983,#eac997 3px,#edcf9e 5px);border-radius:4px 4px 0 0;text-align:center;height:28px;color:#73502b;font-size:12px;line-height:28px}.unit-ruler{display:grid;grid-template-columns:repeat(10,1fr);height:35px;border:1px solid #75906b;background:#f0f5e8}.cm-cell{border-right:1px solid #75906b;position:relative;text-align:center;font-size:10px;color:#5e7754}.cm-cell:last-child{border-right:0}.cm-cell>span{position:relative;z-index:1}.mm-cells{position:absolute;top:0;right:0;bottom:0;left:0;display:grid;grid-template-columns:repeat(10,1fr);align-items:end}.mm-cells i{height:0;border-right:1px solid #9fb190;transition:height .7s ease}.millimeters .mm-cells i{height:14px}.mm-cells i:last-child{border:0}.ruler-caption{display:flex;justify-content:space-between;gap:6px;font-size:10px;color:#809073;margin-top:7px}.ruler-caption strong{font-weight:500}.unit-heading strong{color:#49673e}#unit-detail{min-height:110px;font-size:12px;line-height:1.9;color:#77836b}#unit-detail p{margin:12px 0 0}#unit-detail strong{color:#4a6c40}.zoom-heading{font-size:10px;margin-top:12px}.zoom-ruler{display:flex;margin-top:4px;max-width:320px;background:#e6eedb;border:1px solid #95ad80}.zoom-ruler span{flex:1;text-align:center;border-right:1px solid #95ad80}.zoom-ruler span:last-child{border:0}.unit-warning{color:#b36b34;background:#fff1e3;padding:7px 10px;border-radius:6px;margin-top:12px}.compare-units{display:flex;gap:20px;margin-top:12px}.compare-units span{display:flex;align-items:center;gap:8px;font-size:11px}.compare-units i{height:15px;display:inline-block;background:#839d68}.cm-example{width:100px}.mm-example{width:10px}.unit-correct{padding-top:10px;color:#527348}.unit-footnote{font-size:10px}#unit-lab:not([hidden])~#viewport{min-height:250px;height:250px;flex:initial}@media(max-width:720px){.unit-heading{flex-direction:column;gap:4px}.unit-toggle{gap:5px}.unit-toggle button{padding:7px 6px;font-size:10px}#unit-lab{padding:15px}.compare-units{gap:10px;flex-wrap:wrap}.ruler-caption{font-size:9px}}@media(prefers-reduced-motion:reduce){.mm-cells i{transition:none}}header{height:54px;padding:0 3%}.brand{font-size:16px}.brand-icon{width:32px;height:32px;line-height:30px;font-size:23px}main{max-width:1400px;padding:14px 3% 0}main>.eyebrow{display:none}.title-row{margin:0 0 12px}h1{font-size:26px;margin-bottom:4px}.subtitle{font-size:11px}.problem{padding:9px 14px;margin-bottom:12px}.workspace{gap:14px;grid-template-columns:minmax(0,1fr) 280px}.explanation{padding:18px}.scene-toolbar{height:45px;flex-shrink:0}.scene-toolbar button{min-height:36px}.experiment{min-width:0}#viewport{height:350px;min-height:300px}.lesson-copy{min-height:125px}.formula-card{margin:12px 0;padding:12px}nav{margin:12px 0 16px}nav button span{width:34px;height:34px}.next-button{min-height:44px}.playback{padding:10px 16px}.play-button{width:44px;height:44px}.restart{min-height:44px}.bottom-grid{margin:12px 0;gap:14px;grid-template-columns:1fr 1fr}.discovery,.try{padding:12px 16px;gap:12px}.bottom-grid h3{margin-bottom:5px}.bottom-grid p{font-size:10px}footer{display:none}#unit-lab.scene-unit-controls{position:absolute;top:10px;left:14px;z-index:2;display:flex;gap:6px;padding:0;border:0;background:transparent}.scene-unit-controls button{background:#fffffff0;border:1px solid #dce3d5;border-radius:7px;padding:8px 12px;min-height:40px;font-size:11px;color:#6b7c60}.scene-unit-controls button[aria-pressed=true]{background:#3e674a;color:#fff;border-color:#3e674a}.unit-caption{position:absolute;bottom:43px;left:12px;right:12px;text-align:center;color:#5f754e;font-size:12px;pointer-events:none}.scene-tip{top:61px;font-size:9px}.unit-number{font-size:11px;color:#576b47}.unit-scale-label{font-size:11px;color:#9a5c28;background:#fff3dd;padding:4px 7px;border-radius:5px}.scene-legend{font-size:9px;bottom:12px}input[type=range]{height:20px;margin:0}.range-ends{margin-top:0}.timeline-top{margin-bottom:0}#formula{font-size:19px}h2{font-size:18px;margin:6px 0 8px}@media(min-width:900px)and (min-height:620px){.workspace{height:calc(100dvh - 320px);min-height:355px;max-height:650px}#viewport{height:auto;min-height:200px}.explanation{overflow:auto}.lesson-copy{min-height:0}.formula-card{margin:12px 0}.bottom-grid{min-height:85px}}@media(min-width:721px)and (max-width:899px){.workspace{grid-template-columns:minmax(0,1fr) 255px}header{height:48px}.badge{font-size:9px}.bottom-grid{grid-template-columns:1fr 1fr}.try{flex-wrap:wrap}.overlap-control{width:100%}#viewport{min-height:350px}.explanation{padding:15px}.unit-caption{font-size:10px}.scene-unit-controls button{padding:8px}}@media(max-width:720px){.workspace{grid-template-columns:1fr}.title-row{margin:0 0 10px}h1{font-size:22px}.bottom-grid{grid-template-columns:1fr}#viewport{height:310px;min-height:310px}.explanation{padding:15px}.lesson-copy{min-height:0}.scene-unit-controls button{padding:8px 10px}.unit-caption{font-size:10px}.header-note{display:none}}.catalog{max-width:1150px}.catalog-intro{padding:42px 0 30px}.catalog-intro h1{font-size:32px;margin:14px 0}.catalog-intro p{color:#7b8a73;font-size:14px}.lesson-cards{display:grid;grid-template-columns:1fr 1fr;gap:24px}.lesson-card{display:block;overflow:hidden;background:#fff;border:1px solid #dce5d6;border-radius:18px;text-decoration:none;color:inherit;transition:transform .2s,box-shadow .2s}.lesson-card:hover{transform:translateY(-4px);box-shadow:0 12px 25px #334c3710}.course-art{height:180px;position:relative;display:flex;align-items:center;justify-content:center}.sticks-art{background:#edf0e4;gap:0}.sticks-art i{width:90px;height:18px;background:repeating-linear-gradient(#d3a76d,#e3c18c 4px);transform:rotate(-8deg);border-radius:3px}.sticks-art i:nth-child(2){margin-left:-8px;margin-top:-12px}.sticks-art i:nth-child(3){margin-left:-8px;margin-top:-24px}.sticks-art>span{position:absolute;bottom:30px;color:#7c8869;font-size:13px}.boats-art{background:#dcece8;flex-direction:column;gap:15px}.boats-art span{font-size:44px}.boats-art b{font-size:12px;color:#64867a;font-weight:500}.course-body{padding:24px}.course-body h2{font-size:22px;margin:12px 0}.course-body p{font-size:13px;line-height:1.9;color:#7d8b74;min-height:50px}.course-tags{font-size:11px;color:#8b9c7d;margin:15px 0 23px}.course-body>strong{font-size:13px;color:#496d3f}.back-home,.header-note a{font-size:12px;color:#5d7951;text-decoration:none;padding:10px}.plain-button{border:1px solid #dce3d5;border-radius:6px;background:#fffa;color:#6a7d60;min-height:38px;font-size:11px}.boat-lesson .workspace{height:calc(100dvh - 280px);min-height:430px;max-height:720px}.boat-lesson .experiment{background:#e9f2ee}.boat-lesson .scene-tip{top:12px}#boat-viewport{position:relative;min-height:190px;flex:1}#boat-labels{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;overflow:hidden}.boat-label{position:absolute;transform:translate(-50%,-50%);display:flex;flex-direction:column;align-items:center;gap:3px;padding:5px 8px;white-space:nowrap;border:1px solid #d3e0d2;border-radius:7px;background:#fffffff0;font-size:10px;color:#567651}.boat-label span{font-size:11px}.boat-label.selected{background:#fff0d9;border-color:#daac70;color:#9a6334}.boat-status{position:absolute;bottom:8px;left:8px;right:8px;text-align:center;font-size:10px;color:#577e70}.fee-ledger{background:#fcfdf9;padding:8px 12px;min-height:70px;flex-shrink:0}.fee-ledger table{width:100%;border-collapse:separate;border-spacing:4px;font-size:11px;text-align:center}.fee-ledger th{font-weight:500;color:#7c8f73;font-size:10px}.fee-ledger td{border:1px solid #e5eadd;border-radius:5px;padding:6px;background:#f2f5eb;color:#53694b}.fee-ledger .fee-focus{background:#fbe6c8;border-color:#e8bc84;color:#97632e;font-weight:700}.fee-ledger .fee-muted{color:#8a9285;background:#f4f5f0}.fee-ledger .pending{color:#929a8b;background:#fafbf7;font-size:10px}.boarding-key{display:flex;gap:12px;justify-content:center;align-items:center;min-height:50px;font-size:11px;color:#7b8d6e}.boarding-key b{font-weight:500}#boat-formula{font-size:18px;line-height:1.8;margin:8px 0}#boat-formula em{font-style:normal;color:#b47c3d}#boat-formula strong{color:#47723d;font-size:24px}#boat-note{font-size:11px;line-height:1.8;color:#88957e;margin:0}.boat-takeaway{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:12px 0;padding:14px 18px;background:#edf2e7;border-radius:10px;color:#728664;font-size:11px}.boat-takeaway strong{color:#4e7041;font-size:13px}.boat-lesson .lesson-copy{min-height:0}.boat-lesson .explanation{overflow:auto}@media(max-width:899px){.boat-takeaway{flex-wrap:wrap}.boat-lesson .workspace{height:auto;min-height:490px}#boat-viewport{min-height:290px}.catalog-intro h1{font-size:27px}}@media(max-width:720px){.lesson-cards{grid-template-columns:1fr}.catalog-intro{padding:20px 0}.catalog-intro h1{font-size:24px}.course-art{height:140px}.boat-lesson .workspace{display:grid;height:auto}.boat-lesson .explanation{overflow:visible}.boat-lesson nav button{font-size:9px}.boat-takeaway{flex-direction:column;align-items:flex-start}.boarding-key{gap:7px;font-size:10px}.brand .badge{display:none}}.focused-lesson .badge,.focused-lesson .brand-icon,.focused-lesson .subtitle,.focused-lesson .lesson-tag,.focused-lesson .problem-icon,.focused-lesson .problem-label,.focused-lesson .scene-toolbar,.focused-lesson .scene-tip,.focused-lesson .scene-legend,.focused-lesson .explanation>.eyebrow,.focused-lesson .explanation>nav,.focused-lesson .card-label,.focused-lesson #step-kicker,.focused-lesson #boat-kicker,.focused-lesson .bottom-grid,.focused-lesson .boat-takeaway,.focused-lesson #unit-lab,.focused-lesson .unit-caption,.focused-lesson .boat-status,.focused-lesson .timeline input{display:none!important}.focused-lesson header{height:46px;border-bottom:0}.focused-lesson .brand{font-size:15px;font-weight:500;color:#75816c}.focused-lesson .back-home{font-size:15px}.focused-lesson main{padding:8px 24px 16px;max-width:1500px}.focused-lesson .title-row{margin:0 0 12px}.focused-lesson h1{font-size:27px}.focused-lesson .problem{padding:12px 16px;margin:0 0 16px;border:0;background:#edf1e7}.focused-lesson .problem p{font-size:18px;line-height:1.65}.focused-lesson .workspace,.focused-lesson .boat-lesson .workspace{grid-template-columns:minmax(0,1fr) 340px;height:calc(100dvh - 205px);min-height:440px;max-height:800px;gap:16px}.focused-lesson .explanation{padding:24px;overflow:auto;border:0}.focused-lesson .lesson-copy{min-height:0}.focused-lesson h2{font-size:25px;line-height:1.5;margin:0 0 16px}.focused-lesson .lesson-copy p{font-size:18px;line-height:1.8;color:#52634b}.focused-lesson .formula-card{background:#f0f4e9;padding:16px;margin:22px 0}.focused-lesson #formula,.focused-lesson #boat-formula{font-size:27px;line-height:1.65;margin:0;letter-spacing:0;overflow-wrap:anywhere}.focused-lesson #formula strong,.focused-lesson #boat-formula strong{font-size:34px}.focused-lesson #formula-note,.focused-lesson #boat-note{font-size:15px;line-height:1.6;margin-top:12px;color:#68795a}.lesson-actions{display:flex;gap:10px;margin-top:auto}.lesson-actions button{font-size:17px;min-height:50px;padding:12px;border-radius:8px}.lesson-actions .next-button{flex:1;margin:0}.previous-button{border:1px solid #cbd6c1;background:#fff;color:#5d7551;white-space:nowrap}.previous-button:disabled{opacity:.35;cursor:default}.focused-lesson .playback{padding:10px 16px;gap:12px}.focused-lesson .timeline-top{align-items:center;font-size:16px}.focused-lesson .timeline-top span{font-size:14px}.focused-lesson .restart{font-size:15px}.focused-lesson .play-button{width:46px;height:46px;flex-shrink:0}.focused-lesson #viewport,.focused-lesson #boat-viewport{min-height:180px;height:auto;flex:1}.focused-lesson .stick-label,.focused-lesson .length-label{font-size:16px}.focused-lesson .unit-number,.focused-lesson .joint-label,.focused-lesson .unit-scale-label{font-size:14px}.focused-lesson .ruler-label{font-size:12px}.focused-lesson .boat-label{font-size:14px;padding:6px 9px}.focused-lesson .boat-label span{font-size:15px}.focused-lesson .fee-ledger{padding:10px 12px}.focused-lesson .fee-ledger table{font-size:17px}.focused-lesson .fee-ledger th{font-size:14px}.focused-lesson .fee-ledger td{padding:8px 4px}.focused-lesson .fee-ledger .pending{font-size:13px}.focused-lesson .boarding-key{font-size:15px;flex-wrap:wrap;gap:8px}@media(min-width:721px)and (max-width:900px){.focused-lesson main{padding-inline:16px}.focused-lesson .workspace,.focused-lesson .boat-lesson .workspace{grid-template-columns:1fr;height:auto;max-height:none;min-height:0;gap:12px}.focused-lesson #viewport,.focused-lesson #boat-viewport{height:300px;min-height:300px;flex:initial}.focused-lesson .explanation{padding:18px;display:grid;grid-template-columns:1fr 1fr;gap:12px 20px}.focused-lesson .formula-card{margin:0}.focused-lesson .lesson-actions{grid-column:1/-1}.focused-lesson h2{font-size:23px;margin-bottom:10px}.focused-lesson .lesson-copy p{font-size:17px}.focused-lesson .problem{margin-bottom:12px}.focused-lesson .problem p{font-size:17px}}@media(max-width:720px){.focused-lesson main{padding-inline:12px}.focused-lesson h1{font-size:23px}.focused-lesson .problem p{font-size:16px}.focused-lesson .workspace,.focused-lesson .boat-lesson .workspace{grid-template-columns:1fr;height:auto;min-height:0;max-height:none}.focused-lesson #viewport,.focused-lesson #boat-viewport{height:290px;min-height:290px}.focused-lesson .explanation{padding:18px;overflow:visible}.focused-lesson .lesson-copy p{font-size:17px}.focused-lesson h2{font-size:23px}.focused-lesson .formula-card{margin:16px 0}.focused-lesson .brand,.focused-lesson .back-home{font-size:13px}.focused-lesson .boat-label{font-size:12px}.focused-lesson .boat-label span{font-size:13px}.focused-lesson .fee-ledger th{font-size:12px}}@media(min-width:721px)and (max-width:900px){.focused-lesson #viewport,.focused-lesson #boat-viewport{height:270px;min-height:270px}}.course-navigation{display:flex;align-items:center;gap:12px}.course-switch{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 14px;border:1px solid #c9d5c0;border-radius:8px;background:#edf2e7;color:#49673d;text-decoration:none;font-size:15px;font-weight:600}.course-switch:hover{background:#dfe9d6}.focused-lesson header{min-height:54px;height:auto;padding-block:5px}.focused-lesson .workspace,.focused-lesson .boat-lesson .workspace{height:calc(100dvh - 218px)}@media(max-width:900px){.focused-lesson .workspace,.focused-lesson .boat-lesson .workspace{height:auto}}@media(max-width:600px){.course-navigation{gap:4px}.course-switch{font-size:12px;padding:7px 9px}.focused-lesson .back-home{font-size:12px;padding:7px}.focused-lesson header{padding-inline:12px}.focused-lesson .brand{font-size:12px}}.journey-art{background:#e5eddc;flex-direction:column;gap:16px}.journey-art span{font-size:37px}.journey-art b{font-size:13px;color:#708263}.course-navigation{flex-wrap:wrap;justify-content:flex-end;gap:8px}.focused-lesson header{gap:10px}.focused-lesson .brand{flex-shrink:0}#journey-viewport{position:relative;flex:1;min-height:220px}#journey-labels{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;overflow:hidden}.journey-label{position:absolute;transform:translate(-50%,-50%);font-size:14px;white-space:nowrap;background:#fffd;padding:5px 8px;border-radius:6px;color:#5c704d}.car-label{font-size:15px;color:#996627;background:#fff3dc}.distance-label{background:transparent;font-size:13px}.potential-label{color:#a57032;font-size:13px}.journey-time{display:flex;align-items:center;gap:8px;padding:18px 14px;background:#fff;font-size:16px}.hour-span{flex:1;text-align:center;color:#9aa88e}.hour-span b{font-size:14px;font-weight:500}.hour-span i{display:block;height:4px;background:#dce3d6;margin-top:6px;border-radius:4px}.hour-span.active{color:#4f743e}.hour-span.active i{background:#86a365}#journey-formula{font-size:27px;line-height:1.65;overflow-wrap:anywhere}#journey-formula strong{font-size:34px;color:#47723d}#journey-note{font-size:15px;color:#68795a;line-height:1.6;margin:12px 0 0}@media(min-width:721px)and (max-width:900px){#journey-viewport{height:270px;min-height:270px;flex:initial}}@media(max-width:720px){#journey-viewport{height:290px;min-height:290px;flex:initial}.journey-label{font-size:11px;padding:4px}.car-label{font-size:12px}.potential-label{font-size:11px}.journey-time{font-size:13px;gap:5px}.hour-span b{font-size:12px}}
