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strong{color:#65728f;font-size:14px}footer span{margin-left:auto}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%) translateY(100px);opacity:0;background:#172344;color:white;padding:12px 20px;border-radius:9px;z-index:5;transition:transform .2s,opacity .2s;font-size:13px;max-width:90vw}#toast.visible{transform:translateX(-50%);opacity:1}.error{font-size:11px;color:#ad3628;margin-bottom:15px}.skip{position:fixed;top:-100px;left:15px;z-index:10;background:white;padding:12px}.skip:focus{top:10px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:12px;background:white}.table-wrap table{border-collapse:collapse;width:100%;text-align:left;font-size:14px;min-width:500px}.table-wrap td,.table-wrap th{padding:20px 24px;border-bottom:1px solid var(--line)}.table-wrap tr:last-child>*{border-bottom:0}.table-wrap thead{background:#edf2ff;color:var(--blue)}.table-wrap tbody th{font-size:12px;font-weight:500;color:#5c6c89;max-width:200px}.english{font-weight:400;font-size:11px;display:block}.basics-content>.fine-print{margin-top:10px}.basics-pair{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:25px}.basics-pair article{background:white;border:1px solid var(--line);padding:25px 28px;border-radius:12px}.basics-pair h2{font-size:21px;margin-bottom:13px}.basics-pair p{font-size:13px}.basics-pair .risk-box{border-top:3px solid #b96a4e}.payoff-mini{margin-top:15px;max-width:280px}.payoff-mini svg{width:100%}.payoff-mini span{font-size:10px;color:#7a87a0}.styles .badge{margin-top:15px}.callout{background:#edf2ff;color:#314b8b;border-radius:7px;padding:15px 18px;font-size:12px;margin-top:18px}.concept{margin:33px 0}.concept h2{font-size:22px;margin-bottom:12px}.concept p{font-size:14px;max-width:900px}.basics-question{border-top:1px solid var(--line);padding:25px 0}.basics-question h2{font-size:18px;margin-bottom:15px}dialog{border:1px solid var(--line);border-radius:14px;padding:28px;max-width:90vw;width:570px;box-shadow:0 10px 80px #14245140}dialog::backdrop{background:#1c2d5460}dialog h2{font-size:21px}dialog input{width:100%;padding:10px;border:1px solid var(--line);margin:20px 0}
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@media(min-width:1550px){main{padding-left:55px;padding-right:55px}.lab-grid{grid-template-columns:280px minmax(0,1fr)}}
@media(max-width:1200px){.topbar{padding:0 24px}.app-shell{grid-template-columns:200px minmax(0,1fr)}.sidebar{padding:30px 13px}.hero-sketch{width:135px}.hero h1{font-size:35px}main{padding:27px 24px 0}.lab-grid{grid-template-columns:215px minmax(0,1fr);gap:15px}.graph-panel{padding:22px 19px 15px}.inputs{padding:22px 17px}.choices{gap:8px}.choice{padding:12px 10px;font-size:12px}.greeks{grid-template-columns:repeat(2,1fr);gap:15px}.greeks small{max-width:145px}.workflow span{margin-right:13px;padding-right:15px}.hero{margin-bottom:25px}}
@media(max-width:980px){.app-shell{grid-template-columns:1fr}.sidebar{position:static;height:auto;display:flex;align-items:center;gap:10px;border-right:0;border-bottom:1px solid var(--line);padding:14px 24px;overflow:auto}.sidebar-title,.sidebar-note,.sidebar .progress,.basics-link{display:none}.lesson-list{display:flex;padding:0;width:100%;gap:6px}.lesson-list li{flex:1;min-width:145px}.lesson-list:before{display:none}.lesson-link{padding:8px;font-size:11px;min-height:50px;gap:8px}.step-number{width:27px;height:27px}.topbar{height:auto;min-height:80px;flex-wrap:wrap;padding:18px 24px 12px;row-gap:10px}.topnav{order:3;width:100%;justify-content:center}.navbtn{padding:8px 18px}.hero h1{font-size:36px}main{padding-top:27px}.lab-grid{grid-template-columns:240px minmax(0,1fr)}.greeks{grid-template-columns:repeat(4,1fr)}.greeks strong{font-size:16px}.greeks small{font-size:8px}.hero-sketch{width:160px}}
@media(max-width:760px){.lab-grid{grid-template-columns:1fr}.inputs{display:grid;grid-template-columns:repeat(2,1fr);gap:13px 20px;padding:20px}.inputs .panel-heading,.inputs .segmented,.inputs .fine-print,.inputs .full,.inputs .error{grid-column:1/-1}.segmented{margin:0}.control{padding:0 0 6px}.hero-sketch{display:none}.hero{min-height:auto}.hero h1{font-size:33px}.hero p:last-child{font-size:13px}.prediction-panel{padding:22px 20px}.lesson-heading h2{font-size:21px}.workflow{gap:9px;margin:20px 0}.workflow span{font-size:11px}.choices{flex-direction:column}.choice{padding:13px 14px;font-size:13px}.predict-footer{align-items:flex-start;flex-direction:column;gap:12px}.predict-footer>.primary{width:100%}.graph-panel{padding:22px 15px}.greeks{grid-template-columns:repeat(4,1fr);gap:8px}.greeks small{font-size:9px}.greeks strong{font-size:17px}.price-summary strong{font-size:31px}.graph-heading h3{font-size:16px}.chart-options{gap:6px}.checkbox{font-size:10px}.select-label{max-width:60%}.select-label select{width:100%;font-size:11px}.explanation{padding:22px 20px}.transfer{padding:23px 20px}.transfer h2{font-size:18px}.comparison-strip{gap:9px}.comparison-strip strong{font-size:19px}.completion{flex-wrap:wrap}.basics-pair{grid-template-columns:1fr;gap:14px}.basics-pair article{padding:23px}.table-wrap td,.table-wrap th{padding:16px}.lab-footer{align-items:flex-start}.resources>div{gap:10px;flex-direction:column}footer{align-items:flex-start;flex-direction:column;gap:6px}footer span{margin-left:0}.formula-body{padding:0 17px 18px}.formula-section summary{padding:18px 17px}.formula-values{gap:15px}.hero h1{line-height:1.25}.lesson-index{font-size:36px}.hero{margin-bottom:25px}.sidebar{padding-left:17px;padding-right:17px}}
@media(max-width:430px){main{padding:24px 16px 0}.topbar{padding:16px}.brand{font-size:23px}.brand svg{width:31px;height:31px}.language button{padding:6px 8px}.topnav{gap:0}.navbtn{font-size:11px;padding:9px 12px}.hero h1{font-size:29px}.intro-tag{font-size:11px}.greeks{grid-template-columns:repeat(2,1fr);gap:16px}.greeks small{font-size:9px}.workflow span{font-size:10px;margin-right:6px;padding-right:10px}.workflow{gap:7px}.chart-options{align-items:flex-start}.chart{margin-top:10px}.legend{gap:12px;font-size:10px}.graph-heading .text-button{font-size:10px}.inputs{gap:12px}.price-summary .change{padding-left:16px}.price-summary .change strong{font-size:20px}.lab-footer{flex-direction:column;gap:10px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
/* The calculator is the main product; lessons are a secondary route. */
.calculator-shell{grid-template-columns:minmax(0,1fr);max-width:1440px}.calculator-main{padding:25px 38px 0}.calculator-main .hero{min-height:0;margin-bottom:24px;display:block}.calculator-main .intro-tag{display:none}.calculator-main h1{font-size:34px;max-width:none}.calculator-main .hero p:last-child{max-width:none;margin-top:9px;font-size:14px}.calculator-sketch{display:none}.calculator-main .lab-grid{grid-template-columns:300px minmax(0,1fr);gap:24px;align-items:start}.calculator-main .inputs{position:sticky;top:18px;padding:23px 22px}.calculator-main .control{display:grid;grid-template-columns:1fr 108px;gap:7px 10px;align-items:center;padding-bottom:15px}.calculator-main .control label{margin:0;font-size:12px;justify-content:flex-start;gap:8px}.calculator-main .control input[type=range]{grid-column:1/-1;margin:4px 0 0}.parameter-hint{grid-column:1/-1;font-size:10px;line-height:1.5;color:#7583a0}.calculator-main .segmented{margin:17px 0 21px}.calculator-main .number-wrap input{font-size:16px;min-height:38px}.calculator-main .graph-panel{padding:25px 28px}.valuation-header{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center}.chosen-price{display:flex;flex-direction:column}.chosen-price>span{font-size:13px;font-weight:600;color:#4f6081}.chosen-price>strong{font-size:58px;font-weight:600;letter-spacing:-2px;line-height:1.25;color:var(--blue);font-variant-numeric:tabular-nums;margin:5px 0}.chosen-price>small{font-size:11px;color:#7c8aa1}.other-option{padding:14px 18px;border-left:1px solid var(--line);text-align:left;min-width:170px}.other-option span{display:block;font-size:10px;color:#7c8aa1;margin-bottom:8px}.other-option b{font-size:12px;font-weight:500}.other-option strong{display:block;font-size:26px;font-weight:550;font-variant-numeric:tabular-nums;margin-top:2px;letter-spacing:-.5px;color:#364969}.calc-baseline{display:flex;gap:18px;align-items:center;font-size:11px;margin:12px 0 19px;color:#6c7e9b}.calc-baseline strong{font-weight:600;color:#314a8b}.calc-baseline small{font-size:10px}.live-formula{border:1px solid #d9e2f7;border-radius:9px;background:#f5f7ff;padding:18px 20px}.live-formula-title{display:flex;justify-content:space-between;gap:12px;align-items:center}.live-formula-title h3{font-size:13px;letter-spacing:0}.live-formula-title>span{font-family:Georgia,serif;font-size:12px;color:#8390b0}.live-equation{font-family:Georgia,'Times New Roman',serif;font-size:28px;color:#213b9b;white-space:nowrap;overflow:auto;padding:15px 0 13px;line-height:1.45;letter-spacing:.3px}.formula-decomposition{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:12px;align-items:center;border-top:1px solid #dce4f7;padding-top:14px}.formula-decomposition>div{min-width:0}.formula-decomposition span{display:block;font-size:10px;color:#6e7d9e;min-height:31px;line-height:1.4}.formula-decomposition strong{display:block;font-size:22px;font-weight:550;line-height:1.6;font-variant-numeric:tabular-nums;letter-spacing:-.3px}.formula-decomposition small{display:block;font-size:9px;color:#7b8ba8;font-variant-numeric:tabular-nums}.formula-decomposition .minus{font-size:20px;color:#95a3c4;font-weight:400}.formula-answer strong{color:var(--blue)}.live-factors{display:flex;flex-wrap:wrap;gap:9px 20px;font-size:11px;color:#61749e;padding:14px 0 6px}.live-factors b{font-weight:500}.parameter-explanation{padding:17px 0 15px}.parameter-explanation h3{font-size:12px;letter-spacing:0;color:#51668c}.parameter-explanation p{font-size:12px;line-height:1.7;margin-top:5px;max-width:780px}#calculator-greeks{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:11px 0}#calculator-greeks summary{cursor:pointer;font-size:12px;color:var(--blue);font-weight:500}#calculator-greeks .greeks{margin:14px 0}#calculator-greeks .fine-print{padding-bottom:10px}.model-scope{margin:12px 0 24px}.calculator-main .graph-heading{padding-top:4px}.calculator-main .chart-options{margin-top:15px}.calculator-main .chart{max-height:320px}.chart-readout{display:flex;align-items:center;flex-wrap:wrap;gap:12px;font-size:10px;margin-top:12px;color:#6b7d9a}.chart-readout strong{font-size:16px;font-weight:550;color:#394e77;font-variant-numeric:tabular-nums}.chart-readout small{font-size:10px}.mobile-price{display:none}
@media(min-width:1550px){.calculator-main{padding:30px 45px 0}.calculator-main .lab-grid{grid-template-columns:320px minmax(0,1fr)}}
@media(max-width:1100px){.calculator-main{padding:25px 26px 0}.calculator-main .lab-grid{grid-template-columns:270px minmax(0,1fr);gap:18px}.calculator-main .inputs{padding:20px 17px}.calculator-main .graph-panel{padding:23px 20px}.live-equation{font-size:24px}.formula-decomposition{gap:8px}.formula-decomposition strong{font-size:19px}.other-option{min-width:130px;padding:12px}.chosen-price>strong{font-size:48px}.valuation-header{gap:15px}.calculator-main h1{font-size:31px}.calculator-main .control{grid-template-columns:1fr 94px}}
@media(max-width:760px){.calculator-main{padding:23px 18px 85px}.calculator-main h1{font-size:28px}.calculator-main .lab-grid{grid-template-columns:1fr}.calculator-main .inputs{position:static;display:block;padding:20px}.calculator-main .control{display:grid;grid-template-columns:1fr 120px;padding-bottom:17px}.calculator-main .graph-panel{padding:22px 18px}.calculator-main .hero p:last-child{font-size:13px}.chosen-price>strong{font-size:45px}.other-option{min-width:120px;padding:10px 12px}.other-option strong{font-size:24px}.live-formula{padding:15px}.live-formula-title>span{display:none}.live-equation{font-size:23px}.formula-decomposition strong{font-size:18px}.formula-decomposition span{font-size:9px;min-height:32px}.formula-decomposition small{font-size:8px}.formula-decomposition{gap:7px}.live-factors{gap:8px 14px}.calculator-main .greeks{grid-template-columns:repeat(2,1fr)}.mobile-price{position:fixed;bottom:0;left:0;right:0;background:#fff;border-top:2px solid var(--blue);z-index:4;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 20px;box-shadow:0 -4px 20px #182f6012}.mobile-price>span{font-size:11px;color:#536b96}.mobile-price strong{font-size:27px;font-weight:600;color:var(--blue);font-variant-numeric:tabular-nums;letter-spacing:-.6px}.calculator-main .lab-footer{margin-bottom:20px}#toast{bottom:80px}.calc-baseline{gap:10px;flex-wrap:wrap}}
@media(max-width:430px){.calculator-main{padding:20px 14px 80px}.calculator-main h1{font-size:26px;line-height:1.3}.calculator-main .inputs{padding:20px 17px}.calculator-main .graph-panel{padding:20px 15px}.live-equation{font-size:20px}.chosen-price>span{font-size:11px}.chosen-price>strong{font-size:40px}.other-option{min-width:100px;padding:8px 10px}.other-option span{font-size:9px;max-width:105px}.other-option strong{font-size:21px}.valuation-header{gap:8px}.formula-decomposition{gap:6px}.formula-decomposition strong{font-size:16px}.formula-decomposition .minus{font-size:16px}.live-formula{padding:13px 11px}.formula-decomposition small{font-size:7px}.parameter-explanation p{font-size:12px}.live-equation{letter-spacing:0}.topnav .navbtn{font-size:10px;padding:9px 7px}}
@media(min-width:761px){body[data-view=lab] .topbar{height:68px;min-height:68px}.calculator-main{padding-top:17px}.calculator-main .hero{margin-bottom:16px}.calculator-main h1{font-size:29px}.calculator-main .hero p:last-child{font-size:12px;margin-top:5px}.calculator-main .inputs{padding:17px 20px;top:12px}.calculator-main .segmented{margin:13px 0 15px;padding:3px}.calculator-main .segmented button{padding:6px}.calculator-main .control{gap:4px 10px;padding-bottom:12px}.calculator-main .number-wrap input{min-height:32px;padding-top:4px;padding-bottom:4px;font-size:15px}.calculator-main .control input[type=range]{margin-top:2px}.calculator-main .parameter-hint{display:none}.calculator-main .inputs .fine-print{font-size:9px;margin:2px 0 10px;line-height:1.5}.calculator-main .inputs .full{min-height:34px;padding:7px 10px;font-size:11px}.calculator-main .graph-panel{padding-top:20px}.chosen-price>strong{font-size:52px}.calc-baseline{margin:8px 0 14px}.live-formula{padding:14px 18px}.live-equation{padding:10px 0;font-size:26px}.formula-decomposition{padding-top:11px}.formula-decomposition span{min-height:25px}.live-factors{padding-top:10px}}
@media(min-width:761px) and (max-width:980px){body[data-view=lab] .topbar{height:auto;min-height:0;padding:12px 24px}.calculator-main .control{padding-bottom:12px}}