.cs-panel{--cs-ink:#173f36;--cs-paper:#fffdf8;--cs-line:#d7dccd;color:var(--cs-ink);background:var(--cs-paper);border:1px solid var(--cs-line);border-radius:28px;margin-bottom:36px;padding:clamp(20px,4vw,38px);font-size:1rem;overflow:hidden;box-shadow:0 14px 34px #173f3614}.cs-panel button,.cs-panel input{font:inherit}.cs-panel button{touch-action:manipulation;min-height:52px}.cs-panel button:focus-visible,.cs-panel input:focus-visible{outline-offset:4px;outline:3px solid #9d4d19}.cs-panel small{font-size:.78rem;line-height:1.25}.cs-heading{align-items:center;gap:14px;margin-bottom:14px;display:flex}.cs-heading .cs-icon{background:#edf0df;border-radius:18px;place-items:center;width:58px;height:58px;font-size:1.8rem;display:grid}.cs-heading p{color:#8b491e;letter-spacing:.13em;text-transform:uppercase;margin:0 0 3px;font-size:.72rem;font-weight:800}.cs-heading h3{margin:0;font-family:Georgia,serif;font-size:clamp(1.5rem,4vw,2rem);line-height:1.1}.cs-instruction{color:#3e574e;background:#f2eddf;border-radius:12px;align-items:center;gap:10px;margin:0 0 20px;padding:12px 15px;font-weight:700;line-height:1.45;display:flex}.cs-instruction span{flex:none;font-size:1.25rem}.cs-output{justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:10px;display:flex}.cs-output span{font-weight:750}.cs-output strong{font-size:1.35rem}.cs-field{background:#f4e9bd;border-bottom:7px solid #8a5b35;border-radius:16px 16px 7px 7px;grid-template-columns:repeat(6,1fr);gap:10px;min-height:96px;margin-bottom:20px;padding:12px;display:grid}.cs-field button{opacity:.62;filter:grayscale(.35);cursor:pointer;background:#fff5c7;border:3px solid #9e833e;border-radius:14px;place-items:center;min-width:0;min-height:76px;padding:5px;font-size:clamp(2.25rem,5vw,3.5rem);line-height:1;transition:all .18s;display:grid;transform:scale(.94)}.cs-field button:hover{opacity:.85;transform:scale(1)}.cs-field button.is-grown{opacity:1;filter:none;background:#dceba9;border-color:#176b45;transform:translateY(-3px);box-shadow:inset 0 -7px #176b452e,0 4px #176b45}.cs-cost-stack{gap:12px;display:grid}.cs-cost-row{grid-template-columns:minmax(130px,1fr) minmax(90px,2fr) auto;align-items:center;gap:12px;display:grid}.cs-cost-row>span{display:grid}.cs-cost-row small{color:#62736b}.cs-cost-row i{border-radius:8px;min-height:30px;transition:width .25s;display:block}.cs-fixed-row i{background:repeating-linear-gradient(135deg,#34539a 0 8px,#fff 8px 11px);border:2px solid #34539a}.cs-variable-row i{background:repeating-linear-gradient(90deg,#db712c 0 13px,#a94619 13px 17px);border:2px solid #8d3715}.cs-total-row i{background:repeating-linear-gradient(135deg,#20705c 0 10px,#f2c45e 10px 17px);border:2px solid #175345}.cs-cost-row>strong{text-align:right;min-width:74px}.cs-result{background:var(--cs-ink);color:#fff;border-radius:14px;justify-content:space-between;align-items:center;margin-top:20px;padding:16px 18px;display:flex}.cs-result strong{font-size:1.35rem}.cs-choice-group{grid-template-columns:1fr 1fr;gap:12px;display:grid}.cs-choice-group button{border:2px solid var(--cs-line);color:var(--cs-ink);text-align:left;background:#fff;border-radius:16px;grid-template-rows:auto auto;grid-template-columns:auto 1fr;align-items:center;gap:2px 12px;padding:15px;display:grid}.cs-choice-group button>span{grid-row:1/3;font-size:1.6rem}.cs-choice-group button small{color:#566c63}.cs-choice-group button.is-selected{border-color:var(--cs-ink);background:#eef2e7;box-shadow:inset 0 0 0 2px #fff}.cs-three-choices{grid-template-columns:repeat(3,1fr)}.cs-cost-scene{border:2px solid;border-radius:20px;margin-top:18px;padding:22px}.cs-cost-scene.is-explicit{background:#e8f2ff;border-color:#34539a}.cs-cost-scene.is-implicit{background:#fff0dc;border-color:#a94a1c}.cs-scene-visual{justify-content:center;align-items:center;gap:18px;min-height:86px;display:flex}.cs-person{font-size:2.8rem}.cs-flow{border:2px dashed;border-radius:999px;padding:8px 12px;font-weight:850}.cs-scene-answer{border-top:1px solid;justify-content:center;align-items:center;gap:12px;padding-top:17px;display:flex}.cs-scene-answer>div{display:grid}.cs-scene-answer small{letter-spacing:.08em;font-weight:800}.cs-scene-answer strong{font-size:1.25rem}.cs-type-mark{border:2px solid;border-radius:50%;place-items:center;width:42px;height:42px;font-size:1.25rem;font-weight:900;display:grid}.cs-amount-bars{gap:9px;margin-top:15px;display:grid}.cs-amount-bars>div{border:2px solid #0000;border-radius:11px;grid-template-columns:32px 1fr 52px;align-items:center;gap:10px;padding:7px 9px;display:grid}.cs-amount-bars>div.is-active{background:#edf5ef;border-color:#176b63}.cs-amount-bars i,.cs-profit-bars i{background:#e2e4da;border-radius:999px;height:18px;overflow:hidden}.cs-amount-bars i b,.cs-profit-bars i b{border-radius:inherit;background:#2d759d;height:100%;transition:width .22s;display:block}.cs-amount-bars>div:nth-child(2) i b{background:#d16c2e}.cs-amount-bars>div:nth-child(3) i b{background:#7860a8}.cs-amount-bars strong{text-align:right}.cs-segmented{background:#e9ecdf;border-radius:16px;grid-template-columns:repeat(2,1fr);gap:8px;padding:6px;display:grid}.cs-three-options{grid-template-columns:repeat(3,1fr)}.cs-segmented button{color:var(--cs-ink);background:0 0;border:0;border-radius:11px;font-weight:750}.cs-segmented button.is-selected{background:var(--cs-ink);color:#fff;box-shadow:0 3px 8px #173f3633}.cs-shirts{flex-wrap:wrap;justify-content:center;gap:4px;min-height:86px;padding:22px 10px 12px;display:flex}.cs-shirts span{font-size:clamp(1.4rem,5vw,2.1rem);transition:opacity .2s,transform .2s}.cs-shirts .is-hidden{opacity:.12;filter:grayscale();transform:scale(.75)}.cs-measures{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.cs-measures>div{text-align:center;background:#fff;border:2px solid #d8ddce;border-radius:15px;gap:5px;padding:15px 10px;display:grid}.cs-measures small{color:#526960;font-weight:700}.cs-measures strong{font-size:clamp(1.15rem,4vw,1.5rem)}.cs-measures>div.is-active{background:#fff0dc;border-color:#a3481c}.cs-measure-bar{background:#e4e6dc;border-radius:999px;width:100%;height:15px;overflow:hidden}.cs-measure-bar b{border-radius:inherit;background:#2d759d;height:100%;transition:width .22s;display:block}.cs-measures>div:nth-child(2) .cs-measure-bar b{background:#d16c2e}.cs-measures>div:nth-child(3) .cs-measure-bar b{background:#7860a8}.cs-equation{text-align:center;background:#f1f2e9;border-radius:10px;margin:14px 0 0;padding:11px;font-weight:650}.cs-mini-fact{color:#4c6259;align-items:center;gap:10px;margin-top:12px;font-size:.88rem;display:flex}.cs-mini-fact span:last-child{margin-left:auto}.cs-stepper{grid-template-columns:58px 1fr 58px;align-items:stretch;gap:10px;max-width:330px;margin:auto;display:grid}.cs-stepper button{border:2px solid var(--cs-ink);color:var(--cs-ink);background:#fff;border-radius:14px;font-size:1.8rem;font-weight:500}.cs-stepper output{background:var(--cs-ink);color:#fff;border-radius:14px;place-items:center;padding:8px;display:grid}.cs-stepper output strong{font-size:1.6rem;line-height:1}.cs-stepper output span{font-size:.75rem}.cs-sales-visual{background:#f5ecd4;border-radius:18px;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px;min-height:110px;margin:16px 0;padding:15px;display:grid}.cs-sales-visual div{flex-wrap:wrap;justify-content:center;gap:5px;display:flex}.cs-sales-visual span{font-size:1.6rem}.cs-sales-visual b{font-size:1.1rem}.cs-revenue-measures>div:first-child{background:#e6f3ee;border-color:#176b63}.cs-money-options{grid-template-columns:repeat(3,1fr)}.cs-profit-bars{gap:9px;margin-top:16px;display:grid}.cs-profit-bars>div{grid-template-columns:76px 1fr 42px;align-items:center;gap:10px;font-size:.85rem;display:grid}.cs-profit-bars>div:nth-child(2) i b{background:#d16c2e}.cs-profit-bars>div:nth-child(3) i b{background:#7860a8;min-width:3px}.cs-profit-bars strong{text-align:right}.cs-balance{grid-template-columns:1fr auto 1fr;align-items:center;gap:14px;margin:20px 0;display:grid}.cs-balance>div{background:#fff;border:2px solid #d7dccd;border-radius:18px;place-items:center;gap:3px;padding:18px 10px;display:grid}.cs-balance>div>span{font-size:1.8rem}.cs-balance small{color:#566b62}.cs-balance strong{font-size:1.35rem}.cs-balance-sign{font-size:1.8rem;font-weight:900}.cs-outcome{border:2px solid;border-radius:16px;justify-content:center;align-items:center;gap:12px;padding:17px;display:flex}.cs-outcome>span{font-size:1.4rem}.cs-outcome>div{display:grid}.cs-outcome small{letter-spacing:.08em;font-weight:800}.cs-outcome strong{font-size:1.35rem}.is-profit .cs-outcome{color:#126039;background:#e5f5e9;border-color:#187044}.is-even .cs-outcome{color:#28528e;background:#e7effb;border-color:#345f9d}.is-loss .cs-outcome{color:#8b321f;background:#ffebe4;border-color:#a74229}@media (width<=560px){.cs-panel{border-radius:20px;padding:19px 15px}.cs-choice-group{grid-template-columns:1fr}.cs-cost-row{grid-template-columns:minmax(110px,1fr) minmax(54px,1.25fr) auto;gap:8px}.cs-cost-row small{display:none}.cs-measures{gap:6px}.cs-measures>div{padding:12px 5px}.cs-measures small{font-size:.67rem}.cs-mini-fact{flex-wrap:wrap;align-items:flex-start}.cs-mini-fact span:last-child{width:100%;margin-left:0}.cs-scene-visual{gap:8px}.cs-person{font-size:2.2rem}.cs-field{grid-template-columns:repeat(3,1fr)}.cs-field button{font-size:2.6rem}}@media (prefers-reduced-motion:reduce){.cs-panel *,.cs-panel :before,.cs-panel :after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}:root{color:#193f36;font-synthesis:none;text-rendering:optimizelegibility;--ink:#193f36;--muted:#5b7168;--line:#dcded1;--paper:#fffdf8;--orange:#a95420;background:#f6f2e8;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-width:320px;margin:0}html{scroll-padding-top:24px}a{color:inherit;text-decoration:none}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.45}button,a,input,summary{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,summary:focus-visible{outline-offset:5px;outline:3px solid #b7672d}input:focus-visible{outline:2px solid var(--orange)}[tabindex="-1"]:focus{outline:none}h1,h2,h3,p{margin:0}h1,h2,h3{font-family:Georgia,Times New Roman,serif;font-weight:400}h1{letter-spacing:-.045em;font-size:clamp(3rem,6vw,5.6rem);line-height:1}h1 em{color:#7d8549;font-weight:400}h2{letter-spacing:-.025em;font-size:clamp(1.8rem,3vw,2.8rem);line-height:1.12}h3{font-size:1.6rem;line-height:1.2}.site-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;padding:21px max(24px,50vw - 620px);display:flex}.brand{align-items:center;gap:13px;display:flex}.brand img{width:46px;height:auto}.brand strong{font-family:Georgia,serif;font-size:1.13rem;display:block}.brand small{letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-top:5px;font-size:.65rem;display:block}.text-link{font-size:.83rem;font-weight:650}.skip-link{z-index:50;background:#fff;padding:16px;position:fixed;top:-100px;left:20px}.skip-link:focus{top:10px}.eyebrow{letter-spacing:.14em;text-transform:uppercase;color:var(--orange);margin-bottom:12px;font-size:.68rem;font-weight:750}.primary-button,.secondary-button{border:1px solid var(--ink);border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:14px 24px;font-size:.86rem;font-weight:650;line-height:1.4;transition:background .15s,transform .15s;display:inline-flex}.primary-button{background:var(--ink);color:#fff}.primary-button:hover:not(:disabled){background:#2c5b4b;transform:translateY(-1px)}.secondary-button{color:var(--ink);background:0 0}.secondary-button:hover:not(:disabled){background:#eaeade}footer{border-top:1px solid var(--line);color:var(--muted);justify-content:space-between;gap:16px;padding:26px max(24px,50vw - 620px);font-size:.73rem;display:flex}.home-page{place-items:center;min-height:calc(100svh - 163px);padding:40px 24px;display:grid}.chapter-entry{border-top:1px solid #c6cbb9;border-bottom:1px solid #c6cbb9;align-items:center;gap:28px;width:100%;max-width:850px;padding:45px;transition:background .2s;display:flex}.chapter-entry:hover{background:#eeeadd}.chapter-entry h1{flex:1;font-size:clamp(2rem,4vw,3.6rem)}.chapter-symbol{background:#f0b963;border-radius:50%;place-items:center;width:86px;height:86px;font-family:Georgia,serif;font-size:2rem;display:grid}.entry-arrow{font-size:2rem}.course-page{max-width:1180px;margin:auto;padding:30px 32px 90px}.breadcrumb{color:var(--muted);flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:46px;font-size:.74rem;display:flex}.breadcrumb a{text-underline-offset:4px;text-decoration:underline}.lesson-map{border-left:1px solid #cdd1c0;padding-left:32px}.map-label{text-transform:uppercase;letter-spacing:.1em;margin-bottom:15px;font-size:.69rem;font-weight:700;display:block}.lesson-map>a{width:100%;color:var(--muted);text-align:left;cursor:pointer;background:0 0;border:0;align-items:center;gap:15px;padding:10px 0;font-size:.82rem;display:flex}.lesson-map>a:hover{color:var(--ink)}.lesson-map>a>span{border:1px solid #cdd1c0;border-radius:50%;flex-shrink:0;place-items:center;width:26px;height:26px;font-size:.63rem;display:grid}.lesson-map>a>p{flex:1}.lesson-map .current{color:var(--ink);background:#e3e8d6;border-radius:12px;padding-left:10px;padding-right:10px;font-weight:700}.lesson-map .current>span{background:var(--ink);color:#fff;border-color:var(--ink)}.lesson-map small{color:var(--muted);margin-top:18px;font-size:.73rem;display:block}.chapter-header{padding:0 0 34px}.chapter-header .eyebrow{margin-bottom:8px}.chapter-header h1{font-size:clamp(2rem,5vw,3.6rem);line-height:1.05}.chapter-layout{grid-template-columns:255px minmax(0,1fr);align-items:start;gap:46px;display:grid}.lesson-sidebar{position:sticky;top:24px}.lesson-sidebar .lesson-map{background:#f7f4e9;border:1px solid #cdd1c0;border-radius:18px;padding:22px}.lesson-flow{min-width:0}.concept-section{border-top:1px solid #cdd1c0;margin-bottom:54px;padding-top:38px;scroll-margin-top:20px}.concept-heading{align-items:center;gap:20px;margin-bottom:32px;display:flex}.concept-index{background:#e9dec4;border-radius:50%;flex-shrink:0;place-items:center;width:52px;height:52px;font-family:Georgia,serif;font-size:1.2rem;display:grid}.concept-count{color:var(--muted);white-space:nowrap;margin-left:auto;font-size:.72rem}.concept-heading .eyebrow{margin-bottom:8px}.lemonade-activity{--cost:#bf5b36;--revenue:#2f7650;border:3px solid var(--ink);background:#fffaf0;border-radius:30px;margin-bottom:36px;padding:clamp(24px,4vw,44px);overflow:hidden;box-shadow:0 14px #193f3614}.lemonade-title-row{justify-content:space-between;align-items:center;gap:20px;display:flex}.visual-kicker{color:var(--orange);letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px;font-size:1rem;font-weight:850}.visual-instruction{color:#3f5a50;background:#f1ead8;border-radius:12px;align-items:center;gap:10px;margin:18px 0 0;padding:12px 15px;font-weight:700;line-height:1.45;display:flex}.visual-instruction span{flex:none;font-size:1.25rem}.lemonade-title-row h3{font-size:clamp(1.55rem,3vw,2rem);line-height:1}.replay-button{border:2px solid var(--ink);min-height:58px;color:var(--ink);background:#fff;border-radius:999px;padding:12px 22px;font-size:1.15rem;font-weight:850}.lemonade-playground{grid-template-columns:minmax(240px,.85fr) minmax(280px,1.15fr) minmax(190px,.7fr);align-items:stretch;gap:clamp(18px,3vw,36px);margin:32px 0 24px;display:grid}.ingredient-controls{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;display:grid}.ingredient-button{min-height:145px;color:var(--ink);background:#fff;border:3px solid #d1c8ae;border-radius:26px;flex-direction:column;justify-content:center;align-items:center;gap:7px;transition:transform .18s,border-color .18s,background .18s;display:flex;position:relative}.ingredient-button:hover:not(:disabled){border-color:#de9f2a;transform:translateY(-5px)scale(1.02)}.ingredient-button:disabled{opacity:1}.ingredient-button.added{background:#e7f2df;border-color:#4d895d}.ingredient-picture{filter:drop-shadow(0 5px 3px #0002);font-size:3.2rem;line-height:1}.ingredient-button strong{font-family:Georgia,serif;font-size:1.05rem}.ingredient-price{color:#4d3810;background:#f2c961;border-radius:999px;min-width:62px;padding:5px 10px;font-size:1rem;font-weight:850;display:block}.ingredient-button b{color:#fff;background:#39764b;border-radius:50%;place-items:center;width:38px;height:38px;font-size:1.4rem;display:grid;position:absolute;top:12px;right:12px}.lemonade-stand{filter:saturate(.72);justify-self:center;width:100%;max-width:460px;transition:filter .25s,transform .25s}.lemonade-stand.ready{filter:saturate();transform:translateY(-4px)}.stand-awning{border:4px solid var(--ink);border-bottom:0;border-radius:20px 20px 0 0;grid-template-columns:repeat(5,1fr);height:58px;display:grid;overflow:hidden}.stand-awning span:nth-child(odd){background:#f0b83e}.stand-awning span:nth-child(2n){background:#fff5c9}.stand-scene{border:4px solid var(--ink);background:linear-gradient(#cbe9e5 0 70%,#acd17f 70%);height:185px;position:relative;overflow:hidden}.scene-customer,.sale-coins{opacity:0;transition:opacity .24s,transform .3s cubic-bezier(.2,.8,.2,1);position:absolute;transform:translateY(35px)scale(.65)}.scene-customer.visible,.sale-coins.visible{opacity:1;transform:translateY(0)scale(1)}.stand-items{flex-wrap:wrap-reverse;align-items:flex-end;gap:5px;width:67%;display:flex;position:absolute;bottom:16px;left:5%}.stand-items span{opacity:0;font-size:clamp(2rem,3.5vw,3rem);line-height:1;transition:opacity .24s,transform .3s cubic-bezier(.2,.8,.2,1);transform:translateY(30px)scale(.65)}.stand-items span.visible{opacity:1;transform:translateY(0)scale(1)}.scene-customer{font-size:5rem;bottom:12px;right:8%}.sale-coins{color:#c07b16;letter-spacing:-.12em;font-size:1.7rem;animation:.85s ease-in-out infinite alternate coinBounce;top:26px;right:23%}@keyframes coinBounce{to{transform:translateY(-8px)scale(1.04)}}.stand-sign{border:4px solid var(--ink);color:#fff;letter-spacing:.12em;text-align:center;background:#7fab55;border-top:0;padding:18px;font-size:clamp(1.2rem,2.2vw,1.75rem);font-weight:950}.cost-chart{background:#fff;border:2px solid #d2c9b4;border-radius:20px;flex-direction:column;align-self:start;min-width:0;padding:18px 14px 14px;display:flex}.cost-chart>strong{color:#725744;letter-spacing:.08em;text-align:center;font-size:.8rem;display:block}.cost-bars{flex:1;grid-template-columns:repeat(auto-fit,minmax(24px,1fr));align-items:end;gap:6px;min-height:205px;padding-top:15px;display:grid}.cost-bar-column{text-align:center;grid-template-rows:28px 1fr 30px;align-items:end;gap:5px;height:100%;display:grid}.bar-value{align-self:center;font-size:.95rem;font-weight:900}.bar-track{background:#eeeae0;border-radius:8px 8px 3px 3px;width:100%;height:100%;position:relative;overflow:hidden}.bar-fill{min-height:0;transition:height .42s cubic-bezier(.2,.8,.2,1),bottom .42s 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