:root{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#20383e;background:#f5f7f8;font-synthesis:none;line-height:1.5}*{box-sizing:border-box}body{margin:0}button,input{font:inherit}button,a,input{touch-action:manipulation}button{cursor:pointer}a{color:inherit}aside{width:238px;background:#102d34;color:#b9ced2;position:fixed;inset:0 auto 0 0;padding:36px 23px;display:flex;flex-direction:column}.brand{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:700;color:#fff;text-decoration:none;letter-spacing:-.7px}.brand-icon{color:#78dad0;font-size:32px}.eyebrow{font-size:11px;font-weight:750;letter-spacing:1.8px;color:#397d7e}.side-label{color:#7d9fa7;margin:52px 12px 17px;font-size:9px}.nav{display:flex;gap:13px;padding:13px 15px;margin:4px 0;border-radius:7px;font-size:13px;text-decoration:none}.nav.active{background:#24474d;color:#e0fffa}.side-bottom{margin-top:auto;font-size:11px;padding:12px}.side-bottom b{float:right;font-weight:500;color:#80a3ab}.side-bottom p{color:#7f9ea5;line-height:1.8;margin-top:24px}.status-dot,.small-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:#56c8b0;margin-right:6px}main{max-width:1510px;margin-left:238px;padding:0 52px}header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #dfe6e8;padding:25px 0;font-size:11px;color:#73878d}.pill{font-size:9px;letter-spacing:1px;border:1px solid #c8ded9;color:#397968;background:#edf7f3;border-radius:20px;padding:5px 10px;font-weight:700}.intro{padding:32px 0 22px}h1{font-size:clamp(26px,3vw,39px);line-height:1.2;letter-spacing:-1.3px;margin:12px 0 14px;font-weight:650}.intro>p:last-child,.lesson-heading p,.muted{font-size:13px;color:#72858b}.mobile-break{display:none}.notice{display:flex;gap:13px;padding:15px 19px;border:1px solid #d4e5e4;background:#edf5f4;border-radius:9px;font-size:12px;color:#416669}.notice>span{font-size:20px}.notice strong{font-weight:650}.notice p{margin:3px 0 0;font-size:11px}.section-label{display:flex;align-items:center;justify-content:space-between;margin:28px 0 13px;gap:12px}h2{font-size:18px;letter-spacing:-.4px;margin:0}.section-label>span{font-size:9px;letter-spacing:1.5px;color:#829398}.example-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.example{display:flex;flex-direction:column;text-align:left;background:#fff;border:1px solid #dce4e6;border-radius:9px;padding:17px 18px;gap:11px;color:#304c53}.example.selected{background:#f0f9f7;border:1.5px solid #318f87;padding:16.5px 17.5px}.example-number{font-size:10px;letter-spacing:1px;color:#82969c}.example strong{font-size:13px;max-width:210px;line-height:1.6}.example>span:last-child{font-size:10px;color:#5d8988;margin-top:auto}.lesson-heading{display:flex;justify-content:space-between;align-items:center;margin:31px 0 18px;gap:20px}.lesson-heading .eyebrow{font-size:9px;margin:0 0 8px}.lesson-heading h2{font-size:23px}.lesson-heading p{margin-bottom:0;max-width:650px}.chip{font-size:10px;white-space:nowrap;padding:6px 9px;border:1px solid #dce5e8;border-radius:5px;color:#70858b;background:#fff}.panel{background:#fff;border:1px solid #dfe6e8;border-radius:11px;margin:16px 0;overflow:hidden}.panel-heading{display:flex;justify-content:space-between;gap:10px;padding:20px 24px 12px}h3{margin:0;font-size:14px;font-weight:650}.panel-heading p{font-size:10px;color:#7a8c92;margin:4px 0}.small-dot{width:6px;height:6px;background:#2a8e8a;vertical-align:middle}.blue{background:#5371ad}.chart-tag{font-size:8px;letter-spacing:1px;color:#8a999e;padding-top:3px}.plot{padding:0 25px 16px}.axis-title{font-size:9px;color:#7b8e94}.wave-row,.spectrum-row{display:flex;gap:10px}.wave-row svg{width:calc(100% - 34px);height:155px}.y-labels{width:24px;flex-shrink:0;display:flex;flex-direction:column;justify-content:space-between;font-size:9px;color:#7d8f95;text-align:right}.x-labels{margin:6px 0 0 34px;display:flex;justify-content:space-between;font-size:9px;color:#7d8f95}.axis-bottom{text-align:center;font-size:9px;color:#8b9a9f;margin-top:5px}.scrubber{border-top:1px solid #edf0f2;padding:13px 25px;display:flex;gap:24px;align-items:center;background:#fcfdfd}.scrubber label{font-size:10px;white-space:nowrap;color:#71888e}.scrubber strong{margin-left:10px;color:#315e64}input[type=range]{width:100%;accent-color:#248a81;height:4px}.canvas-wrap{position:relative;width:calc(100% - 34px);height:200px;background:#101b42}.canvas-wrap canvas{width:100%;height:100%;display:block}.window-marker{position:absolute;top:0;bottom:0;border:1px solid #ffffffb0;pointer-events:none;background:#ffffff08}.legend{display:flex;justify-content:flex-end;align-items:center;gap:8px;font-size:8px;color:#71868b;margin-top:13px;flex-wrap:wrap}.colorbar{width:125px;height:7px;border-radius:3px;background:linear-gradient(90deg,#101b42,#273f82,#287caa,#24b8ad,#a5d470,#f3d34a,#ed7941)}.legend small{font-size:8px;margin-left:6px}.chart-foot{font-size:9px;padding:10px 25px;margin:0;color:#7c8f95;border-top:1px solid #edf0f2}.question{padding:25px}.question h3{font-size:17px;margin:10px 0 16px}.question .eyebrow{font-size:9px}fieldset{padding:0;margin:0;border:0;display:grid;gap:8px}.answer{display:flex;align-items:center;gap:10px;border:1px solid #dfe6e8;border-radius:6px;padding:11px 13px;font-size:12px;cursor:pointer}.answer.chosen{border-color:#3b938a;background:#f2faf8}input[type=radio]{accent-color:#25887f}.submit{background:#1b7972;color:#fff;border:0;border-radius:6px;padding:10px 18px;margin-top:17px;font-size:11px;font-weight:600}.submit:disabled{opacity:.5;cursor:default}.retry{border:0;background:none;color:#287c77;font-size:11px;margin-left:15px}.feedback{background:#eef7f4;border-left:3px solid #318b7c;padding:14px 18px;margin-top:18px;font-size:12px}.feedback p{margin:7px 0 0;line-height:1.8}.band-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.band-grid article{background:#fff;border:1px solid #dfe6e8;border-radius:9px;padding:20px}.band-symbol{font-size:26px;color:#49938e}.band-grid h3{margin-top:9px}.band-grid strong{font-size:11px;color:#448884}.band-grid p{font-size:11px;color:#72888e;line-height:1.8}.methods{margin:28px 0;background:#edf1f3;padding:25px;border-radius:9px}.methods h2{font-size:15px}.methods p{font-size:11px;color:#6d8189;line-height:1.9}.methods a,.methods>span{font-size:10px;color:#327a7a}footer{border-top:1px solid #dfe6e8;padding:22px 0 30px;font-size:12px;font-weight:700}footer span{float:right;font-size:9px;font-weight:400;color:#83969c}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}:focus-visible{outline:3px solid #d39d25;outline-offset:4px}section{scroll-margin-top:20px}@media(min-width:1600px){main{margin-right:auto}}@media(max-width:1100px){aside{width:200px;padding:30px 17px}main{margin-left:200px;padding:0 28px}.brand{font-size:18px}.band-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:700px){aside{position:static;width:100%;padding:14px 18px;display:flex;flex-direction:row;align-items:center;gap:9px}.brand{margin-right:auto;font-size:17px;gap:6px}.brand-icon{font-size:25px}.side-label,.side-bottom,.nav span{display:none}.nav{padding:7px 10px;margin:0}.nav.active{background:#24474d}main{margin:0;padding:0 18px}header{padding:16px 0;font-size:9px;gap:8px}.pill{font-size:7px;padding:4px 7px}.intro{padding:24px 0 17px}h1{font-size:29px}.mobile-break{display:block}.intro>p:last-child{font-size:12px}.notice{padding:13px;gap:9px}.section-label>span{display:none}.example-grid{grid-template-columns:1fr;gap:8px}.example{padding:12px 14px;display:grid;grid-template-columns:24px 1fr;gap:4px 9px}.example.selected{padding:11.5px 13.5px}.example strong{max-width:none;font-size:12px}.example>span:last-child{grid-column:2}.lesson-heading{margin-top:25px;display:block}.lesson-heading h2{font-size:21px}.chip{display:inline-block;margin-top:12px}.panel-heading{padding:17px 15px 10px}.chart-tag{display:none}.plot{padding:0 13px 13px}.wave-row svg{height:145px}.scrubber{padding:14px;gap:14px;flex-wrap:wrap}.scrubber input{margin:6px 0}.canvas-wrap{height:185px}.legend{justify-content:center}.chart-foot{padding:10px 15px}.question{padding:19px}.question h3{font-size:16px}.band-grid{gap:9px}.band-grid article{padding:16px}.methods{padding:20px}footer span{float:none;display:block;margin-top:5px}}.lesson{margin-top:38px}.lesson>h2{font-size:26px}.lesson-lead{font-size:14px;color:#617a82;max-width:850px;line-height:1.9}.lesson-steps{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;list-style:none;counter-reset:steps;padding:0;margin:22px 0}.lesson-steps li{background:#edf4f3;padding:20px;border-radius:9px;counter-increment:steps}.lesson-steps strong{font-size:13px}.lesson-steps strong:before{content:counter(steps,decimal-leading-zero) " / ";color:#438c84}.lesson-steps p,.reading-guide p{font-size:12px;color:#617a82;line-height:1.85;margin-bottom:0}.lab-controls{padding:4px 24px 18px;display:flex;align-items:center;gap:15px;font-size:12px}.lab-controls select{font:inherit;color:#285e5e;background:#f2f8f7;border:1px solid #b9d6d0;border-radius:6px;padding:9px 12px;min-width:180px}.transform-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;padding:0 24px}.lesson figure{margin:0;min-width:0}.lesson figcaption{font-size:12px;margin:10px 0 15px}.lesson figcaption span{display:block;font-size:10px;color:#738a91;margin-top:5px}.mini-plot{display:flex;gap:8px}.mini-y{width:37px;flex-shrink:0;display:flex;flex-direction:column;justify-content:space-between;text-align:right;font-size:9px;color:#71858c;line-height:5.8}.mini-plot svg{height:160px;width:calc(100% - 45px);background:linear-gradient(#fbfdfd,#f5f9f9);border:1px solid #edf1f2}.mini-x{display:flex;justify-content:space-between;font-size:9px;color:#71858c;margin:7px 0 0 45px}.transform-grid figure>p{font-size:9px;color:#71858c;margin-left:45px}.lesson-dsa{padding:10px 24px 20px}.lesson-dsa .canvas-wrap{width:calc(100% - 45px);height:160px}.column-marker{position:absolute;top:0;bottom:0;border-left:2px solid white;pointer-events:none}.lab-note{font-size:10px;color:#6a838a;line-height:1.8;padding:0 24px 12px}.reading-guide{background:#edf1f3;border-radius:9px;padding:24px;margin:20px 0}.reading-guide h3{font-size:16px}.agent-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.agent-grid article{border:1px solid #dce6e7;background:#fff;border-radius:9px;padding:22px}.agent-grid h3{font-size:18px;color:#277c73}.agent-grid p,.dataset-resources{font-size:12px;color:#617a82;line-height:1.85}.agent-grid a,.dataset-resources a{color:#277c73;font-size:11px}.dataset-resources{padding:22px;background:#edf4f3;border-radius:9px}.dataset-resources summary{cursor:pointer;font-size:14px;font-weight:650;color:#2f555a}.dataset-resources li{margin:12px 0}.dataset-resources ul{padding-left:20px}@media(max-width:700px){.lesson>h2{font-size:23px}.lesson-steps,.transform-grid,.agent-grid{grid-template-columns:1fr}.lesson-steps li{padding:17px}.transform-grid{padding:0 15px}.lab-controls{padding:4px 15px 12px;flex-wrap:wrap;gap:7px}.lab-controls select{width:100%}.lesson-dsa{padding:10px 15px 20px}.lesson .scrubber label{white-space:normal}.lab-note{padding:0 15px 10px}.reading-guide,.dataset-resources{padding:18px}aside{gap:3px}.nav{padding:7px 9px}.brand{font-size:15px}}.mini-y{line-height:1;justify-content:space-between}.mini-y span{display:block}.axis-chart{margin:8px 0}.chart-y-title{font-size:11px;font-weight:600;color:#4d6972;margin:0 0 10px 48px}.chart-scroll{overflow-x:auto;padding:6px 6px 3px 0;scrollbar-width:thin;scrollbar-color:#90b6b1 #edf3f3}.chart-frame{min-width:560px}.chart-axis-row{display:grid;grid-template-columns:48px minmax(0,1fr)}.chart-y-ticks{position:relative;margin-right:10px;font-size:11px;color:#48626a}.chart-y-ticks>span{position:absolute;right:0;transform:translateY(-50%);white-space:nowrap;line-height:1}.chart-surface{height:270px;position:relative;background:#fbfdfd;border:1px solid #c9d9de;overflow:hidden}.chart-surface>svg:not(.chart-grid),.chart-surface>canvas{display:block;width:100%;height:100%}.chart-surface>.chart-grid{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.chart-grid line{stroke:#c9d9de;stroke-width:.7;opacity:.65}.dark-chart .chart-grid line{stroke:#fff;opacity:.18}.chart-x-ticks{position:relative;height:25px;margin:8px 0 0 48px;font-size:11px;color:#48626a}.chart-x-ticks>span{position:absolute;transform:translate(-50%);white-space:nowrap;line-height:1.3}.chart-x-ticks>.first-tick{transform:none}.chart-x-ticks>.last-tick{transform:translate(-100%)}.chart-x-title{text-align:center;font-size:11px;color:#4d6972;margin-left:48px}.compact-chart .chart-frame{min-width:410px}.compact-chart .chart-surface{height:240px}.transform-grid{grid-template-columns:1fr}.transform-grid .chart-y-title{margin-top:8px}.transform-grid figure>p{margin-left:48px;font-size:10px}.lesson .chart-surface{height:270px}.lesson .compact-chart .chart-surface{height:240px}.practice-section{margin-top:42px}.practice-section>h2{font-size:26px}.nav-number{color:#89b7b5;font-size:10px;letter-spacing:1px;align-self:center}.lesson figcaption{font-size:14px}.lesson figcaption span{font-size:11px}.legend,.legend small{font-size:10px}.chart-foot{font-size:11px}.plot{padding-top:8px}.chart-scroll:focus-visible{outline-offset:-3px}@media(min-width:1450px){.transform-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){aside{flex-wrap:wrap}.brand{width:100%;margin-bottom:6px}.nav span{display:inline}.nav{font-size:10px;gap:5px;padding:7px 5px;flex:1;white-space:nowrap}.nav-number{display:none!important}.chart-y-title{font-size:11px}.chart-surface,.lesson .chart-surface{height:280px}.compact-chart .chart-surface,.lesson .compact-chart .chart-surface{height:250px}.axis-chart:after{content:"Swipe graph sideways to see all time / frequency labels →";display:block;font-size:10px;color:#54757c;margin:9px 0 0 10px}.practice-section>h2{font-size:23px}}.chart-y-ticks{position:sticky;left:0;z-index:3;background:#fff}.chart-x-title{margin-top:3px}.lesson-graph-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;padding:0 24px 24px;align-items:start}.lesson-graph-grid>figure{min-width:0;border:1px solid #dfe9e9;border-radius:8px;padding:16px;background:#fff}.lesson-graph-grid .lesson-dsa{padding:16px}.lesson-graph-grid .chart-frame,.lesson-graph-grid .compact-chart .chart-frame{min-width:390px}.lesson-graph-grid .chart-surface,.lesson-graph-grid .compact-chart .chart-surface{height:240px}.lesson-graph-grid .scrubber{margin:12px -16px -16px;border-radius:0 0 8px 8px;flex-wrap:wrap;gap:12px;padding:15px 16px}.lesson-graph-grid .scrubber input{flex:1;min-width:120px}.lesson-graph-grid .legend{justify-content:center}.spectrum-color-strip{margin:13px 0 0 48px}.spectrum-color-strip>svg{display:block;width:100%;height:28px;border:1px solid #c9d9de}.spectrum-color-strip p{font-size:10px;color:#5f7a81;line-height:1.7}.strip-ticks{display:flex;justify-content:space-between;color:#48626a;font-size:10px;margin-top:5px}.window-reading{padding:22px;border:1px solid #d4e5e0;background:#f0f7f5;border-radius:9px;min-width:0}.window-reading h3{font-size:21px}.window-reading p{font-size:12px;line-height:1.8;color:#526e74}.window-reading .eyebrow{font-size:9px}.class-tag{display:inline-block;background:#dfede9;padding:4px 9px;border-radius:4px}.window-reading dl{margin:18px 0}.window-reading dl>div{border-bottom:1px solid #d5e4df;padding:9px 0}.window-reading dt{font-size:10px;color:#6c858b}.window-reading dd{margin:4px 0 0;font-size:13px;color:#234a51}.power-swatch{display:inline-block;width:14px;height:14px;border-radius:3px;border:1px solid #45606a;margin-right:7px;vertical-align:middle}.model-description{border-left:2px solid #65a398;padding-left:12px}.agent-class{margin:22px 0}.agent-class>h3{font-size:18px}.agent-grid h4{margin:0;font-size:17px;color:#277c73}.lab-controls select{max-width:100%}@media(max-width:1000px){.lesson-graph-grid{grid-template-columns:1fr}}@media(max-width:700px){.lesson-graph-grid{padding:0 15px 15px;gap:15px}.lesson-graph-grid>figure,.lesson-graph-grid .lesson-dsa{padding:12px}.lesson-graph-grid .scrubber{margin:12px -12px -12px}.window-reading{padding:17px}.spectrum-color-strip{margin-left:0}.strip-ticks{font-size:9px}.lesson-graph-grid .chart-surface,.lesson-graph-grid .compact-chart .chart-surface{height:260px}}@media(min-width:1001px){.lesson-graph-grid .chart-frame,.lesson-graph-grid .compact-chart .chart-frame{min-width:340px}}@media(min-width:1001px){.lesson-graph-grid .chart-frame,.lesson-graph-grid .compact-chart .chart-frame{min-width:0}.lesson-graph-grid .chart-scroll{padding-right:2px}.lesson-graph-grid .chart-x-ticks,.lesson-graph-grid .chart-y-ticks{font-size:10px}}.agent-model-note{margin:0 24px 20px;padding:12px 15px;border-left:3px solid #4b958b;background:#edf6f3;color:#42696c;font-size:12px;line-height:1.8}.ideal-lesson{margin:0 24px 24px;padding:20px;background:#f0f7f5;border:1px solid #cbded8;border-radius:8px}.ideal-lesson h3{margin-top:0}.ideal-lesson p{font-size:14px;line-height:1.7}.stage-table-scroll{overflow-x:auto}.stage-table{width:100%;border-collapse:collapse;font-size:13px;text-align:left;min-width:660px}.stage-table th,.stage-table td{padding:12px 10px;border-bottom:1px solid #cbded8;vertical-align:top}.stage-table thead th{font-size:12px;color:#415c58}.stage-table td:nth-child(2),.stage-table td:nth-child(3),.stage-table td:nth-child(4){white-space:nowrap;font-variant-numeric:tabular-nums}.stage-table button{font:inherit;white-space:nowrap;background:#fff;color:#126e6b;border:1px solid #b5d1c9;border-radius:5px;padding:7px;cursor:pointer}.stage-table .active-stage{background:#dceee7}.stage-table button:hover{background:#e2f1eb}.stage-table button:focus-visible{outline:3px solid #187e80;outline-offset:2px}.boundary-note{padding:12px;background:#fff4d8;border-radius:6px}@media(max-width:700px){.ideal-lesson{margin:0 16px 20px;padding:14px}}.top-bar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:24px;padding:12px 32px;background:#102d34;color:#b9ced2;border-bottom:1px solid #24474d}.top-bar .brand{flex-shrink:0;width:auto;margin:0;font-size:21px}.top-bar nav{display:flex;align-items:center;gap:6px;flex:1;flex-wrap:wrap}.top-bar .nav{display:flex;align-items:center;gap:9px;margin:0;padding:10px 12px;font-size:12px;flex:none;white-space:nowrap}.top-bar .nav span{display:inline}.top-bar .prototype-badge{font-size:11px;white-space:nowrap;color:#95b8b9}main{margin:0 auto;max-width:1600px;padding:0 40px}section{scroll-margin-top:100px}.power-calculation{margin:16px 0;padding:16px;background:#fff;border:1px solid #cbded8;border-radius:7px}.power-calculation summary{font-weight:650;cursor:pointer;font-size:14px}.power-calculation p:last-child{margin-bottom:0}@media(max-width:1100px){.top-bar{gap:14px;padding:10px 24px}.top-bar .nav{padding:9px;font-size:11px}.prototype-badge{display:none}main{margin:0 auto;padding:0 24px}}@media(max-width:700px){.top-bar{display:block;padding:10px 15px}.top-bar .brand{font-size:19px;margin-bottom:7px}.top-bar nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px}.top-bar .nav{font-size:11px;padding:7px 8px}.top-bar .nav-number{display:inline!important}main{padding:0 16px}section{scroll-margin-top:160px}}.power-calculation>ol{padding-left:28px;margin:24px 0}.power-calculation>ol>li+li{margin-top:28px;padding-top:20px;border-top:1px solid #dce8e4}.power-calculation>ol>li>b{display:block;margin-bottom:10px;font-size:15px}.power-calculation>ol>li>p{margin:12px 0;line-height:1.85}.power-calculation .worked-formula{padding:12px 14px;background:#f0f7f5;border-radius:6px;overflow-wrap:anywhere}.worked-formula>span{display:block;margin-bottom:5px;font-size:11px;font-weight:600;color:#526e74}.worked-formula>strong{display:block;font-size:14px;color:#234a51}.width-example{margin-top:20px;padding:18px;border:1px solid #cbded8;border-radius:8px;background:#fafdfc}.width-example h4{font-size:15px;margin:0 0 12px}.width-shapes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin:18px 0}.width-shapes>figure{padding:14px;border:1px solid #dce8e4;border-radius:7px;background:#fff}.width-shapes svg{display:block;width:100%;height:auto}.width-shapes svg text{font-size:12px;fill:#415d64;font-family:inherit}.width-shapes figcaption{margin:0 0 8px}.width-shapes p{font-size:12px!important;margin:8px 0!important}@media(max-width:700px){.width-shapes{grid-template-columns:1fr}.width-example{padding:12px}}.glossary{margin:38px 0}.glossary>h2{font-size:26px}.glossary-search{padding:20px 24px;border:1px solid #d4e5e0;background:#edf5f3;border-radius:9px;margin:22px 0}.glossary-search label{display:block;font-weight:650;font-size:13px;margin-bottom:9px}.glossary-search>div{display:flex;gap:12px;align-items:center}.glossary-search input{width:100%;min-width:0;padding:12px 14px;font:inherit;font-size:14px;border:1px solid #a8c9c1;border-radius:6px;background:#fff;color:#20383e}.glossary-search button{font:inherit;font-size:12px;padding:10px;border:1px solid #a8c9c1;border-radius:6px;background:#fff;color:#187e80;white-space:nowrap}.glossary-search>p{font-size:12px;color:#526e74;margin-bottom:0}.glossary-group{margin:28px 0}.glossary-group>h3{font-size:18px;margin-bottom:14px}.glossary-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:0}.glossary-grid>div{padding:20px;border:1px solid #dce6e7;background:#fff;border-radius:9px;min-width:0}.glossary-grid dt{font-size:16px;font-weight:700;color:#276f6b}.glossary-grid dd{margin:0}.glossary-grid p{font-size:13px;line-height:1.8;color:#526e74;margin:9px 0 0}.glossary-grid .glossary-expansion{font-weight:650;color:#36575e}.glossary-grid .glossary-example{border-top:1px solid #e0eae6;padding-top:10px}.glossary-sources,.glossary-empty{font-size:13px;line-height:1.8;color:#526e74}.glossary-sources a{color:#187e80}@media(max-width:1100px){section{scroll-margin-top:140px}}@media(max-width:700px){section{scroll-margin-top:200px}.glossary-grid{grid-template-columns:1fr}.glossary-search{padding:16px}.glossary-search>div{flex-wrap:wrap}.glossary>h2{font-size:23px}.glossary-grid>div{padding:17px}}.band-grid{grid-template-columns:repeat(5,minmax(0,1fr))}.waveform-teaching{margin-top:20px}.waveform-teaching>figure{padding:12px;background:#fff;border:1px solid #d4e5e0;border-radius:7px;margin-top:14px}.waveform-teaching figcaption{font-size:12px;margin:0 0 10px}.waveform-teaching figcaption span{font-size:11px}.waveform-teaching .chart-frame,.waveform-teaching .compact-chart .chart-frame{min-width:280px}.waveform-teaching .chart-surface,.waveform-teaching .compact-chart .chart-surface{height:105px}.waveform-teaching .chart-x-title,.waveform-teaching .chart-y-title,.waveform-teaching .chart-x-ticks,.waveform-teaching .chart-y-ticks{font-size:10px}.waveform-teaching .chart-y-title{margin-bottom:6px}.lesson-steps .teaching-plot-note{font-size:11px;margin:10px 0;line-height:1.7}.lesson-steps .waveform-addition{text-align:center;font-weight:650;color:#285e5e;margin:14px 0 0}.lesson-steps{align-items:start}@media(max-width:1100px){.band-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:850px){.lesson-steps{grid-template-columns:1fr}}@media(max-width:700px){.band-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.waveform-teaching>figure{padding:10px}.waveform-teaching .chart-surface,.waveform-teaching .compact-chart .chart-surface{height:120px}.waveform-teaching .axis-chart:after{display:none}}.band-mnemonic{margin-top:16px;padding:22px 24px;background:#edf5f3;border:1px solid #cbded8;border-radius:9px}.band-mnemonic h3{font-size:13px;color:#526e74}.band-mnemonic .mnemonic-phrase{font-size:26px;line-height:1.5;margin:12px 0 8px;color:#234a51}.mnemonic-phrase b{color:#187e80}.band-mnemonic .mnemonic-order{font-size:16px;line-height:1.9;margin:6px 0;color:#36575e}.band-mnemonic>p:last-child{font-size:12px;color:#526e74;margin:10px 0 0}@media(max-width:700px){.band-mnemonic{padding:18px}.band-mnemonic .mnemonic-phrase{font-size:23px}.band-mnemonic .mnemonic-order{font-size:14px}}:root{--maroon: #7a0019;--maroon-dark: #5b0013;--gold: #ffcc33;--ink: #333333;--muted: #5a5a5a;--paper: #f9f7f6;--tint: #fff8e5;--border: #ded8d2;color:var(--ink);background:var(--paper)}.top-bar{background:var(--maroon);color:#fff2cf;border-bottom:3px solid var(--gold)}.brand-icon,.top-bar .nav-number{color:var(--gold)}.top-bar .prototype-badge{color:#fff2cf}.top-bar .nav.active{background:var(--gold);color:var(--maroon-dark);font-weight:700}.top-bar .nav.active .nav-number{color:var(--maroon-dark)}.top-bar .nav:hover{background:var(--maroon-dark);color:#fff}.top-bar .nav.active:hover{background:#ffde7a;color:var(--maroon-dark)}.eyebrow,.band-symbol,.band-grid strong,.example>span:last-child,.agent-grid h3,.agent-grid h4,.agent-grid a,.dataset-resources a,.methods a,.methods>span,.retry,.glossary-grid dt,.glossary-sources a,.mnemonic-phrase b,.lesson-steps strong:before{color:var(--maroon)}.notice,.lesson-steps li,.ideal-lesson,.window-reading,.band-mnemonic,.reading-guide,.dataset-resources,.methods,.glossary-search{background:var(--tint);border-color:var(--border);color:var(--ink)}.notice{border-left:4px solid var(--gold)}.pill,.class-tag{background:#fff0bd;border-color:#e3c76e;color:var(--maroon-dark)}.example.selected,.answer.chosen{background:#fff8e5;border-color:var(--maroon)}.submit{background:var(--maroon);color:#fff}.submit:hover:not(:disabled){background:var(--maroon-dark)}input[type=range],input[type=radio]{accent-color:var(--maroon)}.feedback{background:var(--tint);border-color:var(--gold)}.small-dot,.status-dot{background:var(--maroon)}.small-dot.blue{background:#8a6510}.panel,.example,.answer,.band-grid article,.agent-grid article,.lesson-graph-grid>figure,.waveform-teaching>figure,.glossary-grid>div,.power-calculation{border-color:var(--border)}.scrubber{background:var(--paper);border-color:var(--border)}.scrubber strong,.dataset-resources summary,.window-reading dd,.band-mnemonic .mnemonic-phrase,.band-mnemonic .mnemonic-order,.lesson-steps .waveform-addition,.glossary-grid .glossary-expansion{color:var(--maroon-dark)}.lab-controls select,.stage-table button{background:#fff;color:var(--maroon);border-color:#c8aaa8}.stage-table .active-stage,.stage-table button:hover{background:#fff0bd}.stage-table th,.stage-table td,.window-reading dl>div{border-color:var(--border)}.agent-model-note{background:var(--tint);border-color:var(--maroon);color:var(--ink)}.model-description{border-color:var(--gold)}.boundary-note{background:#fff0bd}.power-calculation .worked-formula{background:var(--tint)}.worked-formula>strong{color:var(--maroon-dark)}.worked-formula>span{color:var(--muted)}.width-example{background:var(--paper);border-color:var(--border)}.width-shapes>figure{border-color:var(--border)}.width-shapes svg text{fill:var(--muted)}.glossary-search input,.glossary-search button{border-color:#c8aaa8;color:var(--ink)}.glossary-search button{color:var(--maroon)}.glossary-search>p,.stage-table thead th{color:var(--muted)}.chart-surface{background:#fff;border-color:var(--border)}.chart-grid line{stroke:var(--border)}.dark-chart .chart-grid line{stroke:#fff}.chart-scroll{scrollbar-color:#b7a19b var(--paper)}.intro>p:last-child,.lesson-heading p,.muted,.lesson-lead,.notice p,.band-grid p,.methods p,.lesson-steps p,.reading-guide p,.agent-grid p,.dataset-resources,.window-reading p,.window-reading dt,.glossary-grid p,.glossary-sources,.glossary-empty,.band-mnemonic h3,.band-mnemonic>p:last-child,.chart-y-title,.chart-y-ticks,.chart-x-ticks,.chart-x-title,.chart-foot,.legend,.spectrum-color-strip p,.strip-ticks,.lab-note,.lesson figcaption span,.panel-heading p,.scrubber label,.axis-chart:after{color:var(--muted)}:focus-visible{outline-color:var(--maroon)}.top-bar :focus-visible{outline-color:var(--gold)}.stage-table button:focus-visible{outline-color:var(--maroon)}.practice-evidence{padding:20px 24px;margin:18px 0;background:var(--tint);border:1px solid var(--border);border-left:4px solid var(--gold);border-radius:9px}.practice-evidence p{font-size:13px;line-height:1.8;color:var(--muted)}.practice-evidence a{font-size:12px;color:var(--maroon)}#page-content:focus{outline:none}#page-content>header{margin-bottom:24px}#page-content>.notice{margin-bottom:28px}.calculation-reference summary{cursor:pointer;font-size:15px;font-weight:650;color:var(--maroon)}.calculation-reference[open] summary{margin-bottom:18px}.site-footer{display:flex;justify-content:space-between;align-items:flex-start;gap:20px}.footer-information{text-align:right;font-size:12px;font-weight:400;color:var(--muted)}.footer-information p{margin:0 0 5px}.footer-information a{color:var(--maroon);text-underline-offset:3px}@media(max-width:700px){.site-footer{flex-direction:column;gap:12px}.footer-information{align-self:flex-end;font-size:11px}}.waveform-question .compact-chart .chart-surface{height:160px}.waveform-quiz fieldset{display:grid;grid-template-columns:1fr 1fr;gap:8px 12px;margin-top:18px}.waveform-quiz legend{font-size:12px;font-weight:650;margin-bottom:10px}.waveform-quiz label{font-size:12px;align-self:center}.waveform-quiz select{font:inherit;font-size:12px;width:100%;min-width:0;padding:9px;border:1px solid #c8aaa8;border-radius:5px;color:var(--maroon);background:#fff}.waveform-question .feedback p{font-size:12px}@media(max-width:700px){.waveform-quiz fieldset{grid-template-columns:1fr}}.glossary-term{color:var(--maroon);text-decoration:underline dotted;text-underline-offset:3px;text-decoration-thickness:1px}.glossary-term:hover{background:#fff0bd;text-decoration-style:solid}.glossary-destination{background:var(--tint);padding:16px 20px;border:1px solid var(--border);border-radius:8px;margin:20px 0;font-size:13px}.glossary-destination p{margin:0 0 10px}.glossary-destination a{color:var(--maroon)}.glossary-destination button{margin-left:18px;padding:7px 10px;border:1px solid #c8aaa8;border-radius:5px;background:#fff;color:var(--maroon);font-size:12px}.learning-exercise{margin:24px 0;padding:24px;border:1px solid #d8cec5;border-radius:12px;background:#fffdf9;min-width:0;scroll-margin-top:150px}.learning-jumps{display:flex;flex-wrap:wrap;align-items:center;gap:9px;margin:20px 0;padding:14px;background:#fff1c2;border-radius:8px}.learning-jumps b{font-size:12px;margin-right:8px}.learning-jumps button{font:inherit;font-size:12px;background:#fff;color:#7a0019;border:1px solid #d6bc84;border-radius:5px;padding:9px;cursor:pointer}.learning-jumps button:focus-visible{outline:3px solid #7a0019;outline-offset:2px}.column-choices svg[viewBox="0 0 100 210"]{width:100%;max-width:110px;height:230px;border:0}.learning-exercise h3{font-size:22px;margin:8px 0 12px;color:#5b0013}.learning-exercise h4{font-size:15px;color:#5b0013;margin:16px 0 10px}.learning-exercise p{font-size:14px;line-height:1.8;color:#4e4546}.learning-exercise .eyebrow{font-size:10px;color:#7a0019;letter-spacing:1px}.simulation-label{display:inline-block;border-radius:5px;background:#fff1c2;padding:5px 10px;font-size:12px!important}.exercise-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:20px 0}.exercise-grid>div{min-width:0}.learning-exercise .chart-surface,.learning-exercise .compact-chart .chart-surface{height:190px}.learning-exercise .chart-frame,.learning-exercise .compact-chart .chart-frame{min-width:340px}.exercise-controls{display:flex;flex-wrap:wrap;gap:18px;align-items:end;margin:18px 0}.exercise-controls label{display:flex;flex-direction:column;gap:7px;font-size:13px;font-weight:600;min-width:140px;max-width:100%}.learning-exercise select,.learning-exercise input[type=number],.learning-exercise input[type=date],.learning-exercise input:not([type]),.learning-exercise textarea{font:inherit;color:#30282b;padding:10px;border:1px solid #bbaaab;border-radius:5px;background:#fff;max-width:100%;box-sizing:border-box}.learning-exercise textarea{display:block;width:100%;margin:8px 0 16px}.learning-exercise select{display:block;max-width:100%;margin:7px 0}.learning-question{margin:24px 0}.learning-question legend,.recall-question legend{font-weight:700;font-size:15px;line-height:1.65;color:#4b1821;margin-bottom:12px}.learning-question .answer{font-size:14px}.learning-question .feedback{margin-top:14px}.learning-exercise .feedback p{margin-bottom:0}.exercise-legend{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:12px!important}.exercise-legend .colorbar{display:inline-block;flex:0 0 150px;height:14px;border-radius:3px}.column-choices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:20px 0}.column-choices figure{margin:0;border:1px solid #d8cec5;padding:12px;text-align:center;border-radius:8px;background:#fff}.column-choices figcaption{font-size:12px;margin-bottom:10px;line-height:1.6}.column-choices figure>svg{height:200px;width:60px;border:1px solid #29202b;display:block;margin:auto}.bin-values{background:#fff1c2;padding:12px 16px;border-radius:7px;margin:16px 0}.advanced-learning{margin:24px 0;border:1px solid #d8cec5;border-radius:10px;background:#fffdf9}.advanced-learning>summary{font-size:15px;font-weight:700;color:#5b0013;cursor:pointer;padding:20px;line-height:1.6}.advanced-learning>.learning-exercise{border:0;margin:0;padding-top:0}.advanced-learning>summary:focus-visible{outline:3px solid #7a0019;outline-offset:3px}.review-record{border-top:1px solid #d8cec5;padding:16px 0}.review-record>summary{cursor:pointer;font-weight:650;line-height:1.7}.review-record label{display:block;margin-top:14px;font-size:13px;font-weight:600}.recall-question{padding:18px 0;border-top:1px solid #d8cec5}.learning-next{padding:20px 0;font-weight:700}.learning-exercise button:focus-visible,.learning-exercise input:focus-visible,.learning-exercise select:focus-visible,.learning-exercise textarea:focus-visible{outline:3px solid #7a0019;outline-offset:3px}.learning-exercise button{min-height:42px}.learning-exercise button:disabled{opacity:.55;cursor:default}.learning-exercise .retry{margin:10px 12px 10px 0}@media(min-width:1100px){.exercise-grid .chart-frame,.exercise-grid .compact-chart .chart-frame{min-width:0}}@media(max-width:750px){.learning-exercise{padding:16px}.learning-exercise h3{font-size:20px}.exercise-grid{grid-template-columns:1fr}.column-choices{gap:7px}.column-choices figure{padding:8px 4px}.column-choices figcaption{font-size:10px}.learning-exercise .chart-surface,.learning-exercise .compact-chart .chart-surface{height:175px}.exercise-controls{display:block}.exercise-controls label{margin-bottom:14px}.learning-exercise select{width:100%}.advanced-learning>summary{padding:16px}.learning-exercise{scroll-margin-top:180px}}.glossary-scope{display:contents}.scoreboard{flex-shrink:0;border:1px solid #ffcc33;border-radius:9px;background:#fc3;color:#4b0010;padding:8px 14px;cursor:pointer;text-align:right;font:inherit;line-height:1.5;min-width:128px}.scoreboard strong,.scoreboard span{display:block}.scoreboard strong{font-size:14px}.scoreboard span{font-size:11px}.scoreboard:focus-visible{outline:3px solid white;outline-offset:3px}.preview-notice{padding:10px 20px;background:#fff1c2;color:#5b0013;font-size:12px;text-align:center}.learner-entry{padding:28px;margin:28px 0}.learner-entry h2{font-size:26px;color:#5b0013}.learner-entry p{line-height:1.8;font-size:14px}.learner-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:24px 0}.learner-fields label{font-size:14px;font-weight:650}.learner-fields input,.learner-fields select{display:block;width:100%;box-sizing:border-box;margin-top:8px;padding:12px;border:1px solid #bbaaab;border-radius:6px;font:inherit;color:#30282b;background:#fff}.local-storage-note{color:#65585b;font-size:12px!important;max-width:900px}.score-review{width:min(760px,calc(100vw - 40px));max-height:85vh;box-sizing:border-box;border:1px solid #d6c4be;border-radius:14px;padding:28px;color:#30282b;background:#fffdf9}.score-review::backdrop{background:#23000d99}.score-review-heading{display:flex;justify-content:space-between;gap:20px;align-items:start}.score-review-heading h2{margin:0;font-size:23px;color:#5b0013}.score-review-heading button{padding:8px 12px;border:1px solid #7a0019;color:#7a0019;border-radius:5px;background:#fff;cursor:pointer;white-space:nowrap}.score-review p{font-size:14px;line-height:1.8}.missed-answer{padding:18px 0;border-top:1px solid #d8cec5;break-inside:avoid}.missed-answer h3{font-size:17px;color:#5b0013;line-height:1.7}.corrected-answer{color:#3f6636;font-weight:650}.usage-footer{border-top:1px solid #d8cec5;margin-top:32px;padding:20px 0;color:#65585b}.usage-footer h3{font-size:14px;margin:0 0 8px;color:#5b0013}.usage-footer p,.usage-footer li,.usage-footer summary{font-size:12px;line-height:1.9}.usage-footer summary{cursor:pointer}.usage-footer ul{padding-left:20px;max-height:240px;overflow:auto}.usage-footer li{margin:5px 0}@media(max-width:1100px){.top-bar{gap:10px}.scoreboard{min-width:110px;padding:7px 10px}.scoreboard strong{font-size:12px}}@media(max-width:700px){.top-bar{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:7px}.top-bar .brand{margin:0;min-width:0}.top-bar nav{grid-column:1/-1;grid-row:2}.scoreboard{grid-column:2;grid-row:1;min-width:108px;padding:5px 8px}.learner-entry{padding:20px}.learner-fields{grid-template-columns:1fr;gap:16px}.score-review{padding:18px}.score-review-heading h2{font-size:20px}}@media print{body:has(.score-review[open]) .app>*{display:none!important}body:has(.score-review[open]) .top-bar{display:block!important;background:#fff!important}body:has(.score-review[open]) .top-bar>*{display:none!important}body:has(.score-review[open]) .score-review{display:block!important;position:static;width:100%;max-height:none;border:0;overflow:visible}body:has(.score-review[open]) .score-review button{display:none!important}body:has(.score-review[open]) .score-review::backdrop{background:transparent}}.scoreboard .scoreboard-name{font-size:12px;font-weight:700;max-width:170px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.leaderboard-scroll{overflow-x:auto;border:1px solid #d8cec5;border-radius:8px;background:#fffdf9}.leaderboard{border-collapse:collapse;width:100%;font-size:12px;text-align:left}.leaderboard th,.leaderboard td{padding:12px 14px;border-bottom:1px solid #e5dcd4;vertical-align:top;overflow-wrap:anywhere}.leaderboard thead{background:#f6e9dc;color:#5b0013}.leaderboard tbody th{color:#5b0013}.leaderboard td:nth-child(4){white-space:nowrap}.leaderboard tr:last-child>*{border-bottom:0}.agent-reference{border-top:1px solid #d8cec5;padding-top:16px;margin-top:20px!important}.agent-reference .reference-label{font-size:10px;font-weight:750;letter-spacing:.06em;color:#7a0019}.reference-image-link{display:block;background:#fff;border:1px solid #e4dad2;border-radius:6px;padding:10px}.agent-reference img{display:block;width:100%;height:280px;object-fit:contain}.agent-reference figcaption{line-height:1.8}.agent-reference .reference-credit{font-size:10px;line-height:1.7;color:#65585b}.agent-reference a:focus-visible{outline:3px solid #7a0019;outline-offset:3px}@media(max-width:700px){.agent-reference img{height:260px}.leaderboard{min-width:580px}.scoreboard .scoreboard-name{max-width:110px}}.literature-note{padding:16px 20px;border-left:4px solid #ffcc33;background:#fff8df;font-size:13px;line-height:1.8;color:#55454a}.leaderboard-scroll{max-height:380px}.leaderboard thead th{position:sticky;top:0;background:#f6e9dc}.admin-export{margin-top:18px}.admin-dialog label{display:block;font-size:14px;font-weight:650}.admin-dialog input{display:block;box-sizing:border-box;width:100%;padding:12px;margin:8px 0 18px;border:1px solid #bbaaab;border-radius:6px;font:inherit}.admin-dialog [role=alert]{color:#7a0019;font-weight:650}