@charset "UTF-8";
:root{--page:var(--duo-surface);--paper:var(--duo-white);--ink:var(--duo-ink);--muted:var(--duo-blue);--line:var(--duo-subtle);--blue:var(--duo-blue);--blue-light:var(--duo-surface);--orange:#b95521;--mono:ui-monospace,SFMono-Regular,Consolas,monospace;--sans:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-family:var(--sans);color:var(--ink);background:var(--page);font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0}a{color:inherit}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 #e48c28;outline-offset:5px}a{text-underline-offset:4px}p{line-height:1.65}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-weight:550}h2{letter-spacing:-.045em}button{color:inherit}button[disabled]{cursor:not-allowed}.section-shell{max-width:1280px;margin:auto;padding-left:48px;padding-right:48px}.skip-link{position:fixed;top:-60px;left:20px;z-index:99;background:var(--ink);color:white;padding:12px}.skip-link:focus{top:10px}.site-header{background:rgba(245,246,248,.94);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}.header-inner{height:82px;max-width:1440px;padding:0 48px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;white-space:nowrap}.brand strong{font-size:29px;letter-spacing:-1.6px;font-weight:650}.brand>span:last-child{font:10px var(--mono);letter-spacing:1.3px}.brand-mark{display:flex;align-items:center;gap:3px;width:26px;height:29px}.brand-mark i{display:block;width:11px;height:25px;border:1.7px solid var(--blue);border-radius:3px;transform:skewY(-12deg)}.brand-mark i+ i{transform:skewY(12deg);background:var(--blue)}.brand-divider{width:1px;height:17px;background:var(--duo-subtle);margin:0 4px}.site-header nav{display:flex;gap:27px}.site-header nav a,.header-link{font-size:12px;font-weight:550;text-decoration:none}.site-header nav a{color:var(--muted)}.site-header nav a:hover,.text-link:hover{color:var(--blue)}.header-link{display:flex;gap:25px}.header-link span{color:var(--blue);font-size:18px}.hero{display:grid;grid-template-columns:.78fr 1.3fr;gap:50px;padding-top:60px;padding-bottom:46px}.hero-intro{padding-top:18px}.eyebrow{font:10px var(--mono);letter-spacing:1.5px;line-height:1.6;color:var(--muted);margin-bottom:25px}.hero .eyebrow{display:flex;align-items:center;gap:8px}.status-dot{height:5px;width:5px;border-radius:50%;background:var(--blue)}.edition{margin-left:auto;color:var(--duo-secondary)}.hero h1{font-size:clamp(60px,6.15vw,86px);line-height:1.02;letter-spacing:-.068em;margin-bottom:28px;font-weight:540}.hero h1 em{font-style:normal;color:var(--blue)}.hero-copy{font-size:21px;letter-spacing:-.6px;line-height:1.45;margin-bottom:16px}.intro-detail{font-size:14px;color:var(--muted);max-width:310px;margin-bottom:26px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:32px;padding:15px 20px;border-radius:5px;font-size:12px;font-weight:550;text-decoration:none;border:1px solid transparent}.primary{background:var(--blue);color:var(--duo-white)}.primary:hover{background:var(--duo-blue)}.button span{font-size:20px;line-height:1}.hero-footnote{display:flex;align-items:center;gap:12px;font-size:10px;color:var(--muted);line-height:1.65;margin-top:34px}.tiny-fold{font-size:34px;line-height:1;color:var(--duo-secondary)}.explorer{min-width:0;align-self:center}.stage-topline{display:flex;justify-content:space-between;align-items:center;font:9px var(--mono);letter-spacing:1.4px;padding:0 3px 14px}.stage-topline>span:first-child{display:flex;align-items:center;gap:7px}.blue-dot{height:5px;width:5px;background:var(--blue);border-radius:50%}.stage-topline>span:last-child{color:var(--muted)}.device-stage{height:390px;position:relative;display:flex;align-items:center;justify-content:center;isolation:isolate;overflow:hidden;background:radial-gradient(ellipse at 48% 49%,var(--duo-white) 0,var(--duo-surface) 45%,var(--duo-surface) 90%);border:1px solid var(--duo-line);border-radius:7px}.device-stage:before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(134, 134, 139, 0.067) 1px,transparent 1px),linear-gradient(90deg,rgba(134, 134, 139, 0.067) 1px,transparent 1px);background-size:22px 22px;z-index:-1}.stage-coordinate{position:absolute;font:8px var(--mono);letter-spacing:1.5px;color:var(--duo-secondary)}.top-coordinate{top:21px;left:50%;transform:translateX(-50%)}.side-coordinate{left:17px;top:50%;writing-mode:vertical-rl;transform:rotate(180deg)}.device-shadow{position:absolute;bottom:48px;width:70%;height:32px;border-radius:50%;background:rgba(134, 134, 139, 0.188);filter:blur(14px)}.device{width:440px;height:285px;position:relative;border:2px solid var(--duo-tertiary);border-radius:25px;background:linear-gradient(130deg,var(--duo-subtle),var(--duo-white) 50%,var(--duo-tertiary));padding:8px;box-shadow:0 3px 0 var(--duo-tertiary),0 7px 0 -2px var(--duo-tertiary),0 20px 35px rgba(29, 29, 31, 0.125);transition:width .35s,height .35s,transform .35s;transform:perspective(1100px) rotateX(12deg) rotateY(-8deg) rotateZ(-3deg);font-family:var(--sans)}.device-screen{background:var(--duo-white);border:1px solid var(--duo-line);border-radius:16px;overflow:hidden;position:relative;width:100%;height:100%}.app-body{display:grid;grid-template-columns:43% 57%;height:100%;padding-right:39px}.sample-list{padding:18px 13px 12px;background:var(--duo-surface);position:relative;border-right:1px solid var(--duo-line)}.app-title{font-weight:650;font-size:13px;letter-spacing:-.4px;display:flex;gap:6px;align-items:center;margin-bottom:20px}.note-icon{color:var(--blue);font-size:17px}.app-subtitle{font:6px var(--mono);letter-spacing:1px;color:var(--duo-secondary);margin-bottom:9px}.sample-note{padding:10px 6px;border-bottom:1px solid var(--duo-line);font-size:7px;line-height:1.6}.sample-note span,.sample-note small{display:block}.sample-note small{color:var(--duo-secondary);font-size:6px}.sample-note.selected{border:1px solid var(--duo-line);background:var(--duo-surface);border-radius:4px}.sample-note.selected span{color:var(--duo-secondary);font-weight:600}.app-list-footer{position:absolute;bottom:15px;left:18px;right:18px;font-size:6px;color:var(--duo-secondary);display:flex;justify-content:space-between}.sample-detail{padding:20px 20px 12px;min-width:0;background:white}.detail-date{font:6px var(--mono);color:var(--duo-secondary);letter-spacing:1px;margin-bottom:8px}.sample-detail h2{font-size:25px;line-height:1.07;letter-spacing:-1px;margin-bottom:13px;font-weight:550}.detail-art{height:75px;position:relative;background:var(--duo-surface);border-radius:5px;overflow:hidden;margin-bottom:13px}.detail-art>span{position:absolute;bottom:8px;left:9px;font-size:6px;color:var(--duo-secondary);z-index:2}.art-orbit{position:absolute;width:120px;height:75px;border-radius:50%;border:1px solid var(--duo-tertiary);transform:rotate(-30deg);left:18px;top:-10px}.art-orbit.two{left:40px;top:3px;border-color:var(--duo-line)}.art-orbit.three{left:62px;top:16px;border-color:var(--duo-line)}.sample-lines i{display:block;width:100%;height:3px;background:var(--duo-surface);border-radius:3px;margin-bottom:5px}.sample-lines i:nth-child(2){width:91%}.sample-lines i:nth-child(3){width:64%}.detail-footer{font-size:6px;color:var(--duo-secondary);margin-top:13px}.vertical-bar{position:absolute;right:0;top:0;bottom:0;width:39px;background:rgba(210, 210, 215, 0.91);border-left:1px solid var(--duo-line);display:flex;align-items:center;flex-direction:column;gap:13px;padding-top:9px;color:var(--duo-secondary);font-size:13px}.bar-camera{display:block;width:10px;height:10px;border-radius:50%;background:var(--duo-ink);border:2px solid var(--duo-tertiary);visibility:hidden}.bar-time{font:6px var(--mono);margin-top:3px}.bar-compose{background:var(--duo-surface);border-radius:6px;width:24px;height:24px;display:grid;place-items:center;color:var(--blue)}.bar-bottom{margin-top:auto;margin-bottom:15px;line-height:2}.fold-region{position:absolute;left:calc(50% - 22px);width:22px;top:0;bottom:0;background:repeating-linear-gradient(125deg,#2d58de20 0 3px,#2d58de08 3px 6px);border-left:1px dashed #5979c8;border-right:1px dashed #5979c8;z-index:3;display:none}.fold-region span{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%) rotate(-90deg);font:5px var(--mono);letter-spacing:1.2px;color:#2950b5}.camera-region{position:absolute;top:3px;right:2px;width:35px;height:31px;border:1px dashed #bf743c;border-radius:13px;background:#f8c68e40;display:none;z-index:4}.camera-region span{display:none}.inner-camera{position:absolute;width:7px;height:7px;border-radius:50%;background:var(--duo-ink);top:8px;left:calc(50% + 12px);display:none;z-index:5}.app-horizontal-bar{display:none;height:29px;background:var(--duo-surface);border-bottom:1px solid var(--duo-line);align-items:center;justify-content:space-between;padding:0 12px;font-size:7px;color:var(--duo-secondary)}.second-app{display:none}.stage-caption{position:absolute;bottom:13px;left:20px;right:20px;display:flex;gap:6px;align-items:center;justify-content:center;font-size:8px;color:var(--duo-secondary);text-align:center;line-height:1.5}.region-swatch{flex:none;width:7px;height:7px;background:rgba(134, 134, 139, 0.133);border:1px solid var(--duo-tertiary)}.device-stage[data-pose="book"][data-regions="true"] .fold-region,.device-stage[data-pose="tabletop"][data-regions="true"] .fold-region{display:block}.device-stage[data-pose="book"] .app-body{grid-template-columns:49% 51%;gap:14px;padding-right:53px}.device-stage[data-pose="book"] .sample-detail{padding-left:12px;padding-right:10px}.device-stage[data-pose="outer"] .device{width:214px;height:306px;transform:perspective(1100px) rotateY(-7deg) rotateZ(-3deg)}.device-stage[data-pose="outer"] .app-body{display:block}.device-stage[data-pose="outer"] .sample-list{display:none}.device-stage[data-pose="outer"] .sample-detail{height:100%;padding-top:31px;padding-left:16px;padding-right:12px}.device-stage[data-pose="outer"] .detail-art{height:84px}.device-stage[data-pose="outer"] .bar-camera{visibility:visible}.device-stage[data-pose="outer"][data-regions="true"] .camera-region{display:block}.device-stage[data-pose="portrait"] .device,.device-stage[data-pose="tabletop"] .device{width:232px;height:324px;transform:perspective(1000px) rotateX(6deg) rotateZ(-3deg)}.device-stage[data-pose="portrait"] .app-horizontal-bar,.device-stage[data-pose="tabletop"] .app-horizontal-bar{display:flex}.device-stage[data-pose="portrait"] .vertical-bar,.device-stage[data-pose="tabletop"] .vertical-bar{display:none}.device-stage[data-pose="portrait"] .app-body{padding-right:0;height:calc(100% - 29px);grid-template-columns:40% 60%}.device-stage[data-pose="portrait"] .sample-list{padding:12px 6px}.device-stage[data-pose="portrait"] .app-title{font-size:9px;gap:3px}.device-stage[data-pose="portrait"] .sample-detail{padding:15px 10px}.device-stage[data-pose="portrait"] .sample-detail h2{font-size:22px}.device-stage[data-pose="tabletop"] .app-body{display:flex;flex-direction:column-reverse;padding-right:0;height:calc(100% - 29px)}.device-stage[data-pose="tabletop"] .sample-detail{height:46%;padding:10px 13px}.device-stage[data-pose="tabletop"] .sample-detail h2{font-size:18px;margin-bottom:6px}.device-stage[data-pose="tabletop"] .sample-detail h2 br{display:none}.device-stage[data-pose="tabletop"] .detail-art{height:42px;margin-bottom:0}.device-stage[data-pose="tabletop"] .detail-footer,.device-stage[data-pose="tabletop"] .sample-lines,.device-stage[data-pose="tabletop"] .app-subtitle,.device-stage[data-pose="tabletop"] .sample-note:nth-of-type(n+5),.device-stage[data-pose="tabletop"] .app-list-footer{display:none}.device-stage[data-pose="tabletop"] .sample-list{height:54%;padding:23px 12px 0}.device-stage[data-pose="tabletop"] .app-title{margin-bottom:3px;font-size:10px}.device-stage[data-pose="tabletop"] .sample-note{padding:4px 6px;font-size:6px}.device-stage[data-pose="tabletop"] .fold-region{top:calc(50% - 8px);bottom:auto;height:18px;left:0;width:100%;border:0;border-top:1px dashed #5979c8;border-bottom:1px dashed #5979c8}.device-stage[data-pose="tabletop"] .fold-region span{transform:translate(-50%,-50%)}.device-stage[data-camera="true"]:not([data-pose="outer"]) .inner-camera{display:block}.device-stage[data-camera="true"][data-regions="true"]:not([data-pose="outer"]) .camera-region{display:block;left:calc(50% + 5px);right:auto;top:1px;width:21px;height:21px}.device-stage[data-pose="split"] .app-body{width:49%;display:block;padding-left:31px;padding-right:0}.device-stage[data-pose="split"] .sample-list{display:none}.device-stage[data-pose="split"] .sample-detail{height:100%;padding:24px 10px}.device-stage[data-pose="split"] .sample-detail h2{font-size:24px}.device-stage[data-pose="split"] .vertical-bar{left:0;right:auto;width:31px;border-left:0;border-right:1px solid var(--duo-line)}.device-stage[data-pose="split"] .second-app{display:flex;position:absolute;right:0;top:0;bottom:0;width:50%;background:var(--duo-surface);border-left:5px solid var(--duo-line);flex-direction:row-reverse;color:var(--duo-secondary)}.second-bar{width:31px;flex:none;text-align:center;line-height:3;padding-top:20px;font-size:12px;background:var(--duo-subtle)}.second-app>div{flex:1;padding:30px 14px}.second-app small{font:6px var(--mono);letter-spacing:1px}.second-app strong{display:block;margin-top:21px;font-size:29px;font-weight:500;letter-spacing:-1px;line-height:1.05}.second-lines{height:60px;margin-top:20px;background:repeating-linear-gradient(0deg,transparent 0 8px,rgba(134, 134, 139, 0.302) 8px 10px)}.pose-picker{display:grid;grid-template-columns:repeat(6,1fr);gap:4px;padding:14px 0 0}.pose-picker button{font-size:9px;background:transparent;border:1px solid transparent;padding:10px 3px 8px;border-radius:5px;display:flex;align-items:center;gap:5px;justify-content:center;white-space:nowrap;color:var(--duo-secondary)}.pose-picker button:hover{background:var(--duo-surface)}.pose-picker button[aria-pressed="true"]{background:white;border-color:var(--duo-line);color:var(--blue);box-shadow:0 2px 5px rgba(29, 29, 31, 0.031)}.pose-icon{display:inline-block;width:17px;height:12px;border:1.2px solid currentColor;border-radius:2px;position:relative}.outer-icon{width:9px;height:13px}.portrait-icon{width:11px;height:15px}.book-icon:after,.split-icon:after{content:"";height:100%;position:absolute;left:50%;border-left:1px solid currentColor}.book-icon{transform:skewY(-10deg)}.tabletop-icon{width:13px;height:15px;transform:skewX(-13deg)}.tabletop-icon:after{content:"";width:100%;position:absolute;top:50%;border-top:1px solid currentColor}.explorer-options{margin-top:15px;display:flex;gap:15px;align-items:center;flex-wrap:wrap}.toggle{font-size:9px;display:flex;gap:6px;align-items:center;cursor:pointer;color:var(--duo-secondary);position:relative}.toggle input{width:24px;height:14px;position:absolute;opacity:0;margin:0}.toggle>span{width:24px;height:14px;border-radius:10px;background:var(--duo-subtle);display:inline-block;position:relative}.toggle>span:before{content:"";position:absolute;left:2px;top:2px;width:10px;height:10px;background:white;border-radius:50%;transition:transform .15s}.toggle input:checked+span{background:var(--blue)}.toggle input:checked+span:before{transform:translateX(10px)}.toggle input:focus-visible+span{outline:3px solid #e48c28;outline-offset:3px}.toggle:has(input:disabled){opacity:.45;cursor:not-allowed}.concept-label{font-size:8px;color:var(--duo-secondary);margin-left:auto}.state-section{display:grid;grid-template-columns:1fr 1fr;gap:75px;padding-top:36px;padding-bottom:58px;border-top:1px solid var(--line)}.state-explanation .eyebrow{margin-bottom:15px}.state-explanation h2{font-size:31px;line-height:1.15;margin-bottom:18px}.state-explanation>p:not(.eyebrow){font-size:13px;color:var(--muted);max-width:460px;min-height:64px;margin-bottom:21px}.state-facts{display:flex;gap:28px;margin:0 0 25px}.state-facts dt{font:8px var(--mono);letter-spacing:.9px;color:var(--duo-secondary);margin-bottom:8px}.state-facts dd{margin:0;font-size:11px;font-weight:550}.text-link{font-size:11px;font-weight:550;text-decoration:none;display:inline-flex;gap:15px;align-items:center}.code-card{background:var(--duo-ink);color:var(--duo-white);border-radius:7px;overflow:hidden;align-self:stretch;display:flex;flex-direction:column;box-shadow:0 12px 27px rgba(29, 29, 31, 0.063)}.code-toolbar,.lesson-panel-header{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:15px 20px;border-bottom:1px solid rgba(210, 210, 215, 0.086);font:10px var(--mono)}.code-toolbar>span{display:flex;gap:8px;align-items:center}.code-toolbar i{width:7px;height:7px;border-radius:2px;background:var(--duo-subtle);display:block}.copy-button{background:none;color:inherit;border:0;font:9px var(--mono);padding:4px 0;display:flex;align-items:center;gap:12px}.copy-button:hover{color:var(--duo-secondary)}pre{margin:0;overflow:auto;tab-size:4}code{font-family:var(--mono)}.code-card pre{padding:26px 23px;flex:1;font:11px/1.8 var(--mono);white-space:pre-wrap}.code-caption{padding:12px 20px;border-top:1px solid rgba(210, 210, 215, 0.078);color:var(--duo-secondary);display:flex;gap:7px;align-items:center;font-size:9px;line-height:1.5}.code-dot{display:block;width:5px;height:5px;border-radius:50%;background:var(--duo-tertiary);flex:none}.token-keyword{color:var(--duo-secondary)}.token-string{color:var(--duo-secondary)}.token-comment{color:var(--duo-secondary)}.token-type{color:var(--duo-secondary)}.principle-strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding-top:24px;padding-bottom:24px;display:flex;align-items:center;gap:45px}.strip-index{font:8px var(--mono);letter-spacing:1px;color:var(--muted)}.principle-strip p{margin:0;font-size:17px;letter-spacing:-.4px;color:var(--duo-secondary)}.principle-strip strong{color:var(--ink);font-weight:500}.strip-arrow{margin-left:auto;font-size:37px;color:var(--blue);line-height:1}.mobile-break{display:none}.build-section{padding-top:75px;padding-bottom:78px}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:35px;margin-bottom:34px}.section-heading .eyebrow{margin-bottom:17px}.section-heading h2{font-size:37px;line-height:1.15;margin:0}.section-heading>.text-link{margin-bottom:7px;white-space:nowrap}.lesson-layout{display:grid;grid-template-columns:1fr 1.08fr;gap:75px}.lesson-picker{padding-top:7px}.lesson-button{display:flex;text-align:left;width:100%;gap:18px;border:0;border-top:1px solid var(--line);background:transparent;padding:23px 12px 23px 0;align-items:flex-start}.lesson-button:last-of-type{border-bottom:1px solid var(--line)}.lesson-number{font:12px var(--mono);padding-top:3px;color:var(--duo-secondary)}.lesson-button strong{display:block;font-size:15px;font-weight:550;letter-spacing:-.3px;line-height:1.4;margin-bottom:8px}.lesson-button small{display:block;font-size:11px;line-height:1.65;color:var(--muted);max-width:290px}.lesson-arrow{margin-left:auto;color:var(--duo-secondary);font-size:20px}.lesson-button[aria-pressed="true"] .lesson-number,.lesson-button[aria-pressed="true"] strong,.lesson-button[aria-pressed="true"] .lesson-arrow{color:var(--blue)}.lesson-button[aria-pressed="true"]{background:linear-gradient(90deg,transparent,rgba(210, 210, 215, 0.502))}.lesson-note{font-size:10px;color:var(--muted);padding-left:34px;margin:19px 0 0}.lesson-panel{border:1px solid var(--line);background:var(--paper);border-radius:7px;overflow:hidden;display:flex;flex-direction:column;min-width:0}.lesson-panel-header{border-color:var(--line);font-size:10px;color:var(--duo-secondary)}.lesson-panel 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