@font-face{font-family:Inter;src:url('real-assets/inter-regular.woff2') format('woff2');font-weight:400;font-display:swap}@font-face{font-family:Inter;src:url('real-assets/inter-medium.woff2') format('woff2');font-weight:500;font-display:swap}@font-face{font-family:Inter;src:url('real-assets/inter-semibold.woff2') format('woff2');font-weight:600;font-display:swap}
:root{--paper:#ffffff;--surface:#fff;--ink:#0a0a0a;--muted:#666666;--line:#e7e7e7;--brand-ink:#0a0a0a;--accent-soft:#f5f5f5;--sidebar:272px}
*{box-sizing:border-box}html{scroll-padding-top:90px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 Inter,system-ui,sans-serif;-webkit-font-smoothing:antialiased}button,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit}svg{width:20px;height:20px;flex-shrink:0}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--brand-ink);outline-offset:5px;border-radius:4px}button:disabled{cursor:default}h1,h2,h3,p,figure{margin:0}h1,h2,h3{font-weight:500;line-height:1.2}h1{font-size:clamp(40px,4.2vw,60px);letter-spacing:-2.6px;line-height:1.08;text-wrap:balance}h2{font-size:25px;letter-spacing:-.65px}p{margin-bottom:20px}strong{font-weight:600}::selection{background:#ffd6e9}button{color:var(--ink)}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:fixed;top:-100px;left:16px;z-index:100;background:white;padding:12px}.skip-link:focus{top:16px}.topbar{height:70px;position:fixed;left:var(--sidebar);right:0;top:0;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 44px;background:var(--paper);z-index:20}.top-title{font-size:13px;text-decoration:none;letter-spacing:-.2px}.header-progress{font-size:12px;color:var(--muted);text-decoration:none}.header-progress:hover{color:var(--brand-ink)}.icon-button{width:40px;height:40px;border:0;background:transparent;display:flex;align-items:center;justify-content:center}.icon-button svg{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round}.menu-toggle,.menu-close{display:none}
.sidebar{position:fixed;inset:0 auto 0 0;width:var(--sidebar);background:#fafafa;border-right:1px solid var(--line);padding:30px 20px 20px;overflow-y:auto;z-index:30;scrollbar-width:thin}.sidebar-head{display:flex;align-items:center;justify-content:space-between;margin:0 8px 29px}.brand{background:#202023;padding:11px 15px;border-radius:6px;line-height:0;display:inline-flex}.brand img{display:block;width:128px;height:auto}.guide-name{display:block;margin:0 10px 24px;font-size:22px;font-weight:500;letter-spacing:-.7px;line-height:1.3;text-decoration:none}.guide-name span{display:block;font-size:11px;color:var(--muted);letter-spacing:0;font-weight:400;margin-top:7px}.search-wrap{display:flex;align-items:center;gap:8px;background:#ffffff;border:1px solid #e7e7e7;padding:8px 11px;border-radius:7px;margin:0 8px 14px;color:#666666}.search-wrap svg{fill:none;stroke:currentColor;stroke-width:1.5;width:15px;height:15px}.search-wrap input{min-width:0;width:100%;background:none;border:0;color:var(--ink);font-size:12px;line-height:22px;padding:0}.search-wrap:focus-within{outline:2px solid var(--brand-ink);outline-offset:2px}.search-wrap input:focus{outline:none}.search-status{font-size:11px;color:var(--muted);margin:0 10px 12px}.search-status:empty{display:none}.nav-start,.chapter-link{display:flex;align-items:center;text-decoration:none;border-radius:6px;min-height:37px;padding:7px 10px;font-size:12px;gap:9px;line-height:1.5}.nav-start{color:var(--muted);margin-bottom:17px}.nav-label{font-size:10px;letter-spacing:.4px;color:#666666;margin:22px 10px 9px;text-transform:uppercase}.chapter-link{position:relative;margin:2px 0}.nav-number{font-size:10px;color:#666666;width:19px;flex-shrink:0;font-variant-numeric:tabular-nums}.chapter-link:hover,.nav-start:hover{background:#f0f0f0}.chapter-link[aria-current],.nav-start[aria-current]{background:#fff0f7;color:#b90055}.chapter-link[aria-current] .nav-number{color:#0a0a0a}.nav-done{margin-left:auto;display:flex;color:var(--brand-ink)}.nav-done svg{width:13px;height:13px}.utility-nav{border-top:1px solid #e7e7e7;margin:25px 10px 0;padding-top:16px;display:grid;gap:4px}.utility-nav a{font-size:11px;text-decoration:none;color:var(--muted);min-height:32px;display:flex;align-items:center;justify-content:space-between}.utility-nav a:hover,.utility-nav a[aria-current]{color:var(--brand-ink)}.sidebar-foot{font-size:10px;color:#666666;line-height:1.7;margin:22px 10px 0}
#main{margin-left:var(--sidebar);padding:136px 64px 40px;min-height:100vh;outline:none}.chapter,.overview,.utility-page{max-width:760px;margin:0 auto}.eyebrow{font-size:10px;letter-spacing:1.6px;line-height:1.5;color:var(--brand-ink);font-weight:500;margin-bottom:24px}.eyebrow-divider{color:#aaaaaa;margin:0 10px}.intro{font-size:18px;line-height:1.7;color:var(--muted);max-width:640px;margin:24px 0 0;letter-spacing:-.2px}.read-time{font-size:11px;color:var(--muted);margin:22px 0 0}.chapter-header{margin-bottom:36px}.callout{display:flex;align-items:baseline;gap:14px;border-left:2px solid #ff0074;background:#f5f5f5;padding:19px 24px;margin:0 0 48px;font-size:16px;line-height:1.6;color:#242424}.callout>span{font-size:20px}.callout p{margin:0}.prose{font-size:16px;line-height:1.85;letter-spacing:-.12px}.prose>section{margin:42px 0}.prose h2{margin-bottom:20px}.prose p{color:#444444}.prose p:last-child{margin-bottom:0}.prose ul{padding-left:21px;margin:24px 0}.prose li{padding-left:5px;margin:12px 0;color:#444444}.prose strong{color:var(--ink)}.prose section[id]{scroll-margin-top:100px}.application{border-top:1px solid var(--line);padding-top:36px}.application .eyebrow{margin-bottom:13px}.resources{border-top:1px solid var(--line);padding-top:36px}.resource-intro{font-size:13px!important;color:var(--muted)!important;margin-top:-8px}.resource-list{list-style:none!important;padding:0!important;margin:22px 0 0!important}.resource-list li{margin:0!important;padding:0!important;border-top:1px solid var(--line)}.resource-list li:last-child{border-bottom:1px solid var(--line)}.resource-list a{display:flex;align-items:center;gap:18px;padding:19px 0;text-decoration:none;line-height:1.5}.resource-list a:hover strong{color:var(--brand-ink)}.resource-kind{width:46px;flex-shrink:0;font-size:10px;text-transform:uppercase;letter-spacing:.5px;color:var(--brand-ink)}.resource-info{flex:1}.resource-info strong{display:block;font-size:13px;font-weight:500}.resource-info small{display:block;font-size:11px;color:var(--muted);margin-top:4px}.resource-list a>span:last-child{font-size:18px;color:var(--muted)}.chapter-end{display:flex;gap:16px;align-items:center;margin:38px 0 0}.chapter-end>span{font-size:10px;color:var(--muted)}.read-button,.button-row button{display:inline-flex;align-items:center;justify-content:center;gap:9px;border:1px solid #dddddd;border-radius:6px;padding:11px 16px;background:transparent;font-size:12px;line-height:1.5;min-height:42px}.read-button:hover,.button-row button:hover{background:var(--accent-soft)}.read-button[aria-pressed=true]{color:#b90055;background:var(--accent-soft);border-color:#f5b8d4}.read-button svg{width:16px;height:16px}.pagination{display:grid;grid-template-columns:1fr 1fr;gap:30px;border-top:1px solid var(--line);padding-top:27px;margin-top:42px}.pagination a{text-decoration:none}.pagination a:last-child{text-align:right}.pagination small{display:block;font-size:10px;color:var(--muted);margin-bottom:7px}.pagination strong{font-size:14px;font-weight:500}.pagination a:hover strong{color:var(--brand-ink)}.page-footer{border-top:1px solid var(--line);margin-top:70px;padding-top:23px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;color:var(--muted);font-size:10px;line-height:1.6}.page-footer p{width:100%;margin:0;font-size:10px;color:var(--muted)}
.overview h1{font-size:clamp(54px,6.3vw,85px);letter-spacing:-4.4px;line-height:1.04}.accent{color:#666666}.overview>.intro{max-width:620px;margin-top:30px}.text-link{color:var(--brand-ink);font-size:13px;display:inline-flex;align-items:center;gap:13px;text-decoration:none}.text-link:hover{text-decoration:underline}.start-link{margin:28px 0 32px}.text-link svg{width:18px;height:18px}.overview-note{display:flex;flex-wrap:wrap;gap:9px 24px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:16px 0;color:var(--muted);font-size:10px}.overview-note span:not(:first-child):before{content:'·';margin-right:20px;color:#aaaaaa}.about-guide{margin:45px 0 55px;max-width:670px}.about-guide h2{margin-bottom:23px}.about-guide p{font-size:15px;color:#555555;line-height:1.85}.index-group{font-size:10px;font-weight:400;letter-spacing:1.2px;text-transform:uppercase;color:var(--brand-ink);padding-top:30px;margin:0 0 15px}.index-row{display:flex;align-items:center;gap:20px;padding:23px 0;border-top:1px solid var(--line);text-decoration:none}.index-row>span:nth-child(2){flex:1}.index-number{font-size:11px;color:#666666;font-variant-numeric:tabular-nums}.index-row strong{display:block;font-size:17px;font-weight:500;letter-spacing:-.3px}.index-row small{font-size:12px;color:var(--muted);display:block;margin-top:7px;line-height:1.6}.index-row>svg{color:#999999;width:18px}.index-row:hover strong{color:var(--brand-ink)}.library-group{margin-top:45px}.library-group h2{font-size:21px}.library-group h2 a{text-decoration:none}.library-group h2 a:hover{color:var(--brand-ink)}.utility-page progress{display:block;width:100%;height:6px;accent-color:var(--brand-ink);margin:35px 0}.progress-list a{display:flex;align-items:center;justify-content:space-between;padding:14px 0;border-top:1px solid var(--line);font-size:13px;text-decoration:none;gap:20px}.progress-list a>span:last-child{font-size:10px;color:var(--muted);display:flex}.progress-list svg{color:var(--brand-ink);width:16px}.progress-tools{margin-top:44px}.progress-tools h2{margin-bottom:15px}.progress-tools p{font-size:13px;color:var(--muted)}.button-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}#import-status:empty{display:none}.previous-edition{border-left:2px solid #ff0074;padding-left:16px}.storage-warning{position:fixed;bottom:16px;left:calc(var(--sidebar) + 20px);right:20px;z-index:50;padding:15px;background:#fff1d6;border:1px solid #d3b077;font-size:12px;border-radius:6px}.noscript{margin-left:var(--sidebar);padding:30px}
/* UI specimens are live text and vector geometry, so they remain crisp at any width. */
.visual{margin:40px 0 47px;background:#f1efeb;border:1px solid #e4e0d9;border-radius:9px;overflow:hidden;letter-spacing:0}.visual-heading{display:flex;justify-content:space-between;padding:16px 22px;border-bottom:1px solid #e2ded7;font-size:9px;line-height:1.4;letter-spacing:1.1px;color:#6e6677}.visual-body{padding:27px 24px 30px}.paired{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px}.sample{min-width:0;display:flex;flex-direction:column}.sample-label{font-size:10px;line-height:1.5;color:#6e6677;display:block;margin-bottom:15px;font-weight:400;letter-spacing:0}.sample-content{flex:1;display:flex;align-items:stretch;justify-content:center;min-width:0}.visual figcaption{font-size:11px;line-height:1.75;padding:17px 22px 20px;border-top:1px solid #e2ded7;color:#716979}.visit{width:100%;min-width:0;display:flex;flex-direction:column;background:#fff;border:1px solid #e8e4dd;border-radius:7px;padding:25px 22px;color:#292630}.mock-kicker{font-size:10px;letter-spacing:.5px;line-height:1.5;color:#666666}.mock-title{display:block;font-size:27px;line-height:1.2;letter-spacing:-1.05px;margin:14px 0 9px;font-weight:600}.mock-desc{font-size:12px!important;line-height:1.65!important;color:#77717d!important;margin:0 0 24px!important}.mock-meta{display:grid;gap:7px;margin:0 0 25px;font-size:11px;line-height:1.5;color:#696171}.mock-meta>span{display:flex;align-items:center;gap:7px}.mock-meta svg{width:13px;height:13px}.mock-button{display:flex;align-items:center;justify-content:center;gap:9px;min-height:38px;padding:9px 12px;border-radius:5px;background:#0a0a0a;color:white;font-size:10px;line-height:1.5;margin-top:auto}.mock-button svg{width:13px;height:13px}.flat .mock-kicker,.flat .mock-title,.flat .mock-desc,.flat .mock-meta{font-size:12px!important;font-weight:400!important;letter-spacing:0!important;line-height:1.65!important;color:#615c68!important}.flat .mock-title{margin:12px 0}.flat .mock-meta{gap:12px;margin-top:0}.flat .mock-desc{margin-bottom:12px!important}.flat .mock-button{background:#e8e6e9;color:#4e4955}.type-flat .mock-title{font-size:17px;font-weight:400;letter-spacing:0;line-height:1.5}.type-flat .mock-kicker,.type-flat .mock-desc,.type-flat .mock-meta{font-size:12px!important;color:#615c68!important}.type-flat .mock-desc{line-height:1.3!important}.too-colorful{background:#f4e0d1;border-color:#d5b3a1}.too-colorful .mock-title{color:#254b76}.too-colorful .mock-meta{color:#b04625}.too-colorful .mock-button{background:#2e6d57}.brand-neutral .mock-title{letter-spacing:-.5px}.brand-neutral .mock-button{background:#3e4246}.brand-editorial{background:#f4e9d9;border-color:#e2d4be}.brand-editorial .mock-title{font-family:Georgia,serif;font-weight:400;font-size:31px}.brand-editorial .mock-button{background:#655145}.brand-editorial .mock-kicker{color:#7b5a46}
.field-stack{display:flex;flex-direction:column;gap:32px;width:100%;background:white;border:1px solid #e8e4dd;border-radius:7px;padding:27px 24px;justify-content:center}.field-group{display:flex;flex-direction:column;gap:8px}.field-group>span{font-size:10px;line-height:1.5;color:#77717d}.field-group>strong{font-size:15px;font-weight:500;line-height:1.5;color:#302b37}.ungrouped{gap:24px}.ungrouped .field-group{gap:24px}.irregular{gap:15px}.irregular .field-group:first-child{gap:24px}.irregular .field-group:last-child{gap:4px}.measured{gap:0}.measured .field-group{gap:0}.measure{display:flex;align-items:center;font-style:normal;font-size:8px;color:#74559d;background:#eee7f6;border-left:1px solid #a68cbe;width:max-content;padding-left:6px;line-height:1;position:relative;z-index:1}.measure.small{height:8px}.measure.large{height:24px;margin-left:-10px;padding-left:10px}.measured .field-group>strong{line-height:1.65}.target-row{display:flex;align-items:center;justify-content:center;gap:5px;margin:30px 0}.target-row span{display:flex;align-items:center;justify-content:center;position:relative}.target-row svg{width:19px;height:19px}.cramped span{width:24px;height:24px;border:1px dashed #c8c0d2}.comfortable{gap:8px;margin:18px 0}.comfortable span{width:48px;height:48px;border:1px dashed #a69ab7;background:#f9f6ff;border-radius:5px}.visual-targets .sample-content{display:block;background:white;border:1px solid #e8e4dd;border-radius:7px;padding:14px 8px 20px}.sample-help{font-size:10px!important;line-height:1.6!important;color:#79717f!important;text-align:center;margin:0!important;display:block}.feedback{background:#fff;border:1px solid #d8c6c5;border-left:3px solid #a04d46;border-radius:6px;padding:22px;width:100%;font-size:12px;line-height:1.6}.feedback>svg{width:18px;height:18px;color:#934c46;margin-bottom:14px}.feedback strong{display:block;font-size:12px}.feedback p{font-size:11px!important;line-height:1.65!important;margin:7px 0 17px!important}.retry{font-size:10px;color:#673938;display:inline-block;border-bottom:1px solid #bd8d88}.vague{border:1px solid #e2ded8}.vague strong{color:#934c46}.vague .mock-button{background:#ece9ee;color:#625c6b;margin-top:27px}.surface-demo{width:100%;position:relative;padding:0 0 65px;min-height:235px}.surface-card{background:#fff;border:1px solid #e2ded8;border-radius:7px;padding:21px;margin-bottom:13px}.skeleton{display:block;width:54%;height:6px;background:#e7e2ed;border-radius:2px;margin-bottom:9px}.skeleton.wide{width:80%;background:#d5cbdc}.floating-menu{position:absolute;top:75px;right:5px;width:88%;background:white;box-shadow:0 8px 24px #28233118,0 2px 4px #28233110;border:1px solid #e2ded8;border-radius:6px;padding:8px}.floating-menu span{display:block;padding:9px;font-size:11px;line-height:1.4}.over-shadow .surface-card,.over-shadow .floating-menu{box-shadow:5px 7px 4px #302c3b40}.icon-set{display:flex;align-items:center;justify-content:space-around;background:white;width:100%;border:1px solid #e8e4dd;border-radius:7px;padding:45px 15px;gap:10px}.icon-set svg{width:26px;height:26px;stroke-width:1.6}.mixed-icons svg:nth-child(1){stroke-width:3}.mixed-icons svg:nth-child(2){fill:#51465f;stroke-width:1}.mixed-icons svg:nth-child(3){stroke-width:.8}.mixed-icons svg:nth-child(4){stroke-width:2.7}.optical-demo{display:grid;justify-items:center;width:100%;background:#e9e6ed;border:1px solid #e0dce5;border-radius:7px;padding:25px 15px;gap:17px}.optical-demo>svg{width:140px;max-width:100%;height:auto}
.state-sheet{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px 20px;padding:7px 3px 30px}.state-sheet .sample-label{margin-bottom:12px}.state-button{display:flex;align-items:center;justify-content:center;padding:10px 13px;border-radius:5px;background:#0a0a0a;color:#fff;font-size:10px;line-height:1.6;min-height:38px;white-space:nowrap}.state-button.is-hover{background:#493675}.state-button.is-pressed{background:#3b2a63;box-shadow:inset 0 2px 4px #17102330}.state-button.is-focus{outline:2px solid #7963aa;outline-offset:4px}.state-button.is-disabled{background:#d9d5df;color:#726c7b}.live-demo{border-top:1px solid #dcd6e2;padding-top:25px;display:grid;grid-template-columns:1fr auto;gap:10px 22px;align-items:center}.live-demo strong{font-size:12px;font-weight:500}.live-demo p{font-size:10px!important;line-height:1.7!important;margin:5px 0 0!important;color:#746c7d!important}.demo-button{background:#0a0a0a;color:#fff;border:1px solid transparent;border-radius:5px;padding:11px 16px;font-size:11px;min-width:145px;min-height:42px;display:flex;align-items:center;justify-content:center;gap:8px;transition:background .15s,transform .1s}.demo-button svg{width:14px;height:14px}.demo-button:hover{background:#493675}.demo-button:active{background:#3b2a63;transform:translateY(1px)}.demo-button:focus-visible{outline:2px solid #7963aa;outline-offset:4px}.demo-button[aria-disabled=true]{cursor:wait}.live-demo #demo-status{grid-column:1/-1}.nav-example{width:100%;background:white;border:1px solid #e8e4dd;border-radius:7px;padding:40px 9px}.mock-nav{display:flex;justify-content:space-around;border-top:1px solid #eee9f1;padding-top:15px;gap:5px}.mock-nav>span{display:flex;flex-direction:column;align-items:center;gap:8px;color:#8a828f;min-width:48px}.mock-nav svg{width:20px;height:20px}.mock-nav small{font-size:10px;line-height:1.5;white-space:nowrap}.mock-nav .selected{color:#0a0a0a;font-weight:600}.mock-nav .selected svg{background:#eae3f3;box-sizing:content-box;padding:5px 13px;border-radius:20px;margin:-5px -13px}.unclear-nav .selected{color:#81798a;font-weight:400}.unclear-nav .selected svg{background:none;padding:0;margin:0}
@media(min-width:1500px){#main{padding-top:150px}.sidebar{padding-top:36px}.chapter,.overview,.utility-page{max-width:790px}}
@media(max-width:1100px){:root{--sidebar:248px}#main{padding-left:40px;padding-right:40px}.topbar{padding:0 40px}.sidebar{padding-left:14px;padding-right:14px}.visit{padding:22px 17px}.visual-body{padding:23px 20px}.paired{gap:16px}.mock-title{font-size:24px}.mock-meta{font-size:9px}.field-stack{padding:24px 18px}}
@media(max-width:900px){:root{--sidebar:280px}.topbar{left:0;padding:0 22px;height:64px;justify-content:initial;gap:12px}.header-progress{margin-left:auto;font-size:10px}.menu-toggle,.menu-close{display:flex}.sidebar{transform:translateX(-100%);transition:transform .2s;max-width:calc(100vw - 36px);padding-top:25px}.sidebar-head{margin-bottom:24px}.brand img{width:118px}.nav-open .sidebar{transform:none}.nav-open{overflow:hidden}.nav-backdrop{position:fixed;inset:0;background:#24202960;z-index:25}.chapter-link{min-height:42px;font-size:13px}.nav-number{font-size:11px}.utility-nav a{min-height:38px}.sidebar-foot{margin-top:24px}#main{margin-left:0;padding:112px 38px 30px}.chapter,.overview,.utility-page{max-width:710px}h1{font-size:52px}.overview h1{font-size:76px}.storage-warning{left:15px}.noscript{margin-left:0}}
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/* Reading revision: readable defaults, independent user-controlled rem scale. */
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/* A persistent location and completion readout; reading controls stay within reach. */
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/* Insany: official logo and Inter, monochrome surfaces, pink as a focused accent. */
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