:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#203b32;background:#fff;font-synthesis:none;--ink:#203b32;--muted:#576a62;--line:#dde7e1;--green:#2e5d49;--soft:#f3f7f4;--header:72px}
*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button,a,input,summary,textarea{-webkit-tap-highlight-color:transparent}a{color:var(--green);text-underline-offset:3px}button{cursor:pointer}button:disabled{cursor:default}button,summary{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid #267b60;outline-offset:3px}h1,h2,p,figure,dl{margin:0}h1:focus,main:focus{outline:none}[hidden]{display:none!important}.sr-only,.guide-skip:not(:focus){position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.guide-skip:focus{position:fixed;top:8px;left:8px;z-index:100;background:white;padding:14px}
.guide-header{height:var(--header);position:sticky;top:0;z-index:15;display:flex;align-items:center;gap:28px;padding:12px 28px;border-bottom:1px solid var(--line);background:#fff}.guide-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-size:18px;letter-spacing:-.5px;line-height:1.1;font-weight:650}.guide-brand small{display:flex;align-items:center;gap:4px;font-size:10px;font-weight:400;letter-spacing:0;margin-top:3px}.guide-brand small img{width:76px;height:auto}.guide-mark{width:34px;height:34px}.guide-header-label{border-left:1px solid var(--line);padding-left:26px;font-size:13px;color:var(--muted)}.guide-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:36px;padding:7px 12px;border:1px solid #d5e1d9;border-radius:7px;background:#f8faf8;color:var(--green);text-decoration:none;font-size:13px;line-height:1.3;white-space:nowrap}.guide-button:hover{background:#eaf2ec;border-color:#b8cdc0}.guide-button svg{width:17px;height:17px;flex:none}.guide-open{margin-left:auto;background:var(--green);color:white;border-color:var(--green);padding-inline:15px}.guide-open:hover{background:#224b3a;color:white}
.guide-layout{display:grid;grid-template-columns:278px minmax(0,1fr);max-width:1600px;margin:auto}.guide-sidebar{position:sticky;top:var(--header);height:calc(100dvh - var(--header));overflow-y:auto;overscroll-behavior:contain;border-right:1px solid var(--line);background:#f8faf8;padding:24px 14px 20px;scrollbar-width:thin;scrollbar-color:#cbd8cf transparent}.sidebar-intro{display:flex;align-items:center;gap:10px;padding:0 9px 19px}.sidebar-intro>svg{width:24px;height:24px;flex:none;color:#46745c}.sidebar-intro strong{font-size:13px;font-weight:650}.sidebar-intro p{font-size:11px;color:var(--muted);margin-top:4px}.guide-search{padding:0 7px 20px}.guide-search label{display:block;font-size:12px;font-weight:600;margin-bottom:7px}.guide-search>div{position:relative}.guide-search input{width:100%;min-height:40px;padding:8px 31px 8px 10px;border:1px solid #cfdcd3;border-radius:7px;background:#fff;color:var(--ink);font-size:12px}.guide-search input::placeholder{color:#63776c}.search-clear{position:absolute;right:3px;top:3px;border:0;border-radius:4px;width:32px;height:34px;background:white;color:var(--green)}.guide-group{margin-bottom:13px}.guide-group summary{display:flex;align-items:center;gap:8px;padding:10px 9px;list-style:none;font-size:11px;font-weight:700;color:#52695d;cursor:pointer}.guide-group summary::-webkit-details-marker{display:none}.group-number{font-size:10px;letter-spacing:.5px;font-variant-numeric:tabular-nums;color:#526c5b}.group-chevron{margin-left:auto;font-size:15px;transform:rotate(-90deg)}.guide-group[open] .group-chevron{transform:none}.guide-group ul{margin:0;padding:0;list-style:none}.guide-group a{display:block;padding:9px 12px 9px 30px;border-radius:6px;font-size:13px;line-height:1.45;text-decoration:none;color:#445e50;min-height:36px}.guide-group a:hover{background:#eef4ef}.guide-group a[aria-current=page]{background:#e4eee6;color:#234e37;box-shadow:inset 3px 0 #397653;font-weight:600}.guide-no-results{padding:12px 9px;font-size:13px;color:var(--muted);line-height:1.6}.sidebar-foot{margin:22px 9px 0;border-top:1px solid var(--line);padding-top:18px;font-size:11px;color:var(--muted);line-height:1.7}
#guide-content{min-width:0;padding:0 clamp(24px,5vw,80px) 32px;max-width:1120px;width:100%;margin-inline:auto}.guide-reading-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:24px 0 36px}.guide-reading-toolbar>div{display:flex;gap:6px}.reading-label{font-size:10px;letter-spacing:1.7px;color:#536d5c}.guide-reading-toolbar .guide-button{font-size:12px;min-height:32px;background:white}.article-kicker{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:#557461;letter-spacing:.3px;margin-bottom:14px}.article-kicker>span:last-child{color:#536d5c;font-variant-numeric:tabular-nums}article{scroll-margin-top:100px;padding-top:10px}article+article{margin-top:70px;border-top:1px solid var(--line);padding-top:40px}.guide-ready article+article{margin-top:0;border:0;padding-top:10px}h1{font-size:clamp(29px,3.4vw,42px);font-weight:620;line-height:1.16;letter-spacing:-1.2px;color:#1d3f30;margin-bottom:17px}.article-intro{font-size:17px;line-height:1.7;max-width:780px;color:#52675b}.guide-location{display:flex;align-items:flex-start;gap:14px;margin:25px 0 24px;padding:12px 15px;border:1px solid var(--line);border-radius:8px;background:#fafcf9;font-size:12px;line-height:1.6}.guide-location>span{font-weight:700;white-space:nowrap;color:#365a43}.guide-location p{color:#51695a}.guide-figure{margin-bottom:34px;border:1px solid #dce5df;border-radius:12px;overflow:hidden;background:#f7faf8}.guide-figure>a{display:block;background:#eef3ef;padding:0}.guide-figure img{display:block;width:100%;max-width:100%;height:auto;object-fit:contain}.guide-figure figcaption{display:flex;align-items:flex-start;justify-content:space-between;gap:15px;padding:12px 15px;font-size:11px;line-height:1.5;color:var(--muted)}.image-hint{white-space:nowrap;color:var(--green)}
article section{margin-top:32px}h2{font-size:19px;letter-spacing:-.3px;font-weight:650;line-height:1.4;margin-bottom:16px}.guide-steps{list-style:none;counter-reset:step;margin:0;padding:0;display:grid;gap:16px}.guide-steps li{counter-increment:step;position:relative;padding-left:43px;font-size:15px;line-height:1.7;min-height:29px;color:#3c5548}.guide-steps li:before{content:counter(step,decimal-leading-zero);position:absolute;left:0;top:0;width:28px;height:28px;display:grid;place-items:center;border-radius:7px;background:#eaf2eb;color:#3b654b;font-size:11px;font-weight:700}.section-hint{font-size:12px;color:var(--muted);line-height:1.7;margin:-6px 0 14px}.guide-examples{display:grid;gap:10px}.guide-example{border:1px solid var(--line);border-radius:8px;padding:15px 17px;background:#fff}.example-equation{display:flex;align-items:center;gap:12px;justify-content:space-between;min-width:0}.guide-math{display:inline-block;max-width:100%;overflow-x:auto;vertical-align:middle;padding:4px 2px;color:#204832}.guide-math>span{display:block}.guide-math svg{max-width:none;height:auto;display:block}.guide-example p{font-size:13px;line-height:1.6;color:var(--muted);margin-top:10px}.copy-expression{flex:none;border:1px solid #d2dfd5;border-radius:5px;background:#f5f9f6;min-height:32px;padding:5px 10px;font-size:12px;color:#376348}.copy-expression:hover{background:#e4eee6}.guide-source{overflow-wrap:anywhere;font-size:15px}
.guide-options{border-top:1px solid var(--line)}.guide-options>div{display:grid;grid-template-columns:minmax(140px,25%) minmax(0,1fr);gap:22px;padding:16px 0;border-bottom:1px solid var(--line);font-size:14px;line-height:1.75}.guide-options dt{font-weight:600;color:#2d513a;overflow-wrap:anywhere}.guide-options dd{margin:0;color:#52665b;overflow-wrap:anywhere}.guide-practice{margin-top:28px;padding:21px 23px;background:#edf4e9;border:1px solid #dce8d4;border-radius:10px}.guide-practice>span{display:block;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:#3d673b;margin-bottom:8px}.guide-practice p{font-size:15px;line-height:1.75;color:#3f5d3c}.guide-tips{margin-top:25px;padding-left:17px;border-left:3px solid #c7d7aa}.guide-tips p{font-size:13px;line-height:1.75;color:#5c684d}.guide-tips p+p{margin-top:10px}.guide-related h2{font-size:15px}.guide-related>div{display:flex;flex-wrap:wrap;gap:8px}.guide-related a{display:inline-flex;align-items:center;min-height:36px;padding:7px 12px;border:1px solid var(--line);border-radius:6px;background:#fafcf9;font-size:12px;text-decoration:none}.guide-pagination{display:flex;justify-content:space-between;gap:20px;margin-top:35px;border-top:1px solid var(--line);padding:22px 0}.guide-pagination a{font-size:13px;line-height:1.7;max-width:48%;text-decoration:none}.guide-pagination a:last-child{text-align:right}.guide-footer{margin-top:28px;padding-top:20px;border-top:1px solid var(--line);font-size:11px;color:var(--muted);line-height:1.8}.guide-footer p{margin-top:5px}.guide-footer a{color:var(--muted)}
.guide-enhanced{display:none}.guide-ready .guide-enhanced{display:flex}.guide-ready .guide-search{display:block}.topics-toggle,.sidebar-close{display:none!important}.guide-noscript{padding:20px;text-align:center;background:#f4f7ee}
dialog{max-width:calc(100vw - 32px);max-height:calc(100dvh - 32px);border:1px solid #cfded2;border-radius:12px;background:#fff;color:var(--ink);padding:20px;box-shadow:0 20px 80px #12302038}dialog::backdrop{background:#15271fcc}dialog header{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:15px}dialog h2{font-size:17px;margin:0}#guide-image-dialog{width:min(1380px,calc(100vw - 32px))}.guide-image-scroll{overflow:auto;max-height:calc(100dvh - 190px);background:#f3f7f4;border-radius:6px}.guide-image-scroll img{display:block;max-width:100%;height:auto;margin:auto}.image-caption{font-size:12px;color:var(--muted);line-height:1.6;margin-top:12px}#guide-copy-dialog{width:500px}#guide-copy-dialog p{margin:14px 0;font-size:14px;line-height:1.6}#guide-copy-dialog textarea{width:100%;min-height:100px;padding:12px;border:1px solid #cddbd1;border-radius:6px;resize:vertical}#guide-copy-dialog button{margin-top:15px}
.guide-image-scroll img{max-width:100%}.is-actual-size .guide-image-scroll img{max-width:none;width:auto}
#guide-image-title{min-width:0;flex:1}#guide-image-dialog header{gap:10px}
#guide-image-dialog[open]{display:flex;flex-direction:column;overflow:hidden}#guide-image-dialog>header,#guide-image-dialog>.guide-image-regions,#guide-image-dialog>.image-caption{flex:none}#guide-image-dialog .guide-image-scroll{flex:1 1 auto;min-height:0;width:100%}
.guide-image-regions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:12px;margin-bottom:12px}.guide-image-regions [aria-pressed=true]{background:#e4eee6;border-color:#799f85}.guide-image-frame{min-width:0}#guide-image-dialog[data-region=editor] .guide-image-scroll{max-width:420px;margin-inline:auto}#guide-image-dialog[data-region=editor] .guide-image-frame{position:relative;overflow:hidden;aspect-ratio:307/844}#guide-image-dialog[data-region=editor] img{position:absolute;width:416.938%;max-width:none;left:0;top:-6.635%}#guide-image-dialog[data-region=graph] .guide-image-frame{position:relative;overflow:hidden;aspect-ratio:973/844}#guide-image-dialog[data-region=graph] img{position:absolute;width:131.552%;max-width:none;left:-31.552%;top:-6.635%}
.guide-figure-limited{max-width:min(100%,calc(var(--guide-image-max-width) + 2px));margin-inline:auto}
.guide-figure-limited img{max-height:700px}
.guide-figure picture{display:block}
/* A wide equation scrolls inside its card; it must never widen the page. */
.example-equation>.guide-math,.example-equation>.guide-source{min-width:0;flex:1 1 0}
.guide-examples{grid-template-columns:minmax(0,1fr)}.guide-example{min-width:0}.function-entry>div{grid-template-columns:minmax(0,1fr)}
.guide-math:focus-visible{outline:2px solid #267b60;outline-offset:2px}
.guide-inline-math{max-width:100%;font-size:1em;vertical-align:middle}
.guide-inline-math svg{display:inline-block;vertical-align:middle}
.guide-steps li,.guide-tips p,.guide-practice p{min-width:0;overflow-wrap:anywhere}
.function-search-label{margin:14px 0 8px;font-size:14px}.guide-ready #function-search{display:block;width:100%;min-height:44px;border:1px solid #cfdcd3;border-radius:7px;padding:10px}.function-entry{border-bottom:1px solid var(--line);padding:12px 0}.function-entry summary{cursor:pointer;min-height:32px;font-weight:600}.function-entry>div{display:grid;gap:14px;padding:12px 0;font-size:14px;line-height:1.7;min-width:0}.function-entry code{overflow-wrap:anywhere}.function-entry p{overflow-wrap:anywhere}#function-status{font-size:13px;margin-top:8px}
@media(min-width:1600px){.guide-layout{border-inline:1px solid var(--line)}}
@media(max-width:900px){:root{--header:64px}.guide-header{padding:10px 18px;gap:20px}.guide-header-label{padding-left:18px}.guide-layout{grid-template-columns:242px minmax(0,1fr)}.guide-sidebar{padding-inline:9px}#guide-content{padding-inline:26px}.reading-label{display:none}.guide-reading-toolbar{justify-content:flex-end}.guide-options>div{grid-template-columns:1fr;gap:5px}.guide-figure figcaption{display:block}.image-hint{display:block;margin-top:5px}.article-intro{font-size:16px}}
@media(max-width:700px){:root{--header:62px}.guide-header{padding:10px 15px;gap:10px}.guide-brand{font-size:16px}.guide-mark{width:31px;height:31px}.guide-header-label{display:none}.guide-open{font-size:12px;min-height:40px;padding:8px 10px}.guide-open svg{display:none}.guide-layout{display:block}.guide-sidebar{position:static;width:auto;height:auto;padding:18px;border-right:0;border-bottom:1px solid var(--line)}.guide-ready .guide-sidebar{position:fixed;top:var(--header);bottom:0;left:0;width:min(322px,calc(100vw - 35px));height:auto;z-index:30;border-right:1px solid var(--line);transform:translateX(-105%);visibility:hidden}.guide-ready .guide-sidebar.is-open{transform:none;visibility:visible}.guide-ready .topics-toggle,.guide-ready .sidebar-close{display:inline-flex!important}.sidebar-close{margin-left:auto;font-size:22px;min-width:40px}.sidebar-intro{gap:8px;padding-inline:0}.sidebar-intro strong{font-size:12px}.sidebar-intro>svg{width:20px}.guide-scrim{position:fixed;inset:var(--header) 0 0;background:#17352355;z-index:25}.guide-group a{min-height:44px;padding-block:12px}.guide-group summary{min-height:44px}.guide-search input{min-height:44px}.guide-reading-toolbar{position:sticky;top:var(--header);z-index:10;background:#fff;justify-content:space-between;margin:0 -4px 24px;padding:12px 4px;border-bottom:1px solid var(--line)}.guide-reading-toolbar .guide-button{min-height:40px;font-size:11px;padding:8px 10px}.guide-reading-toolbar>div{gap:5px}#guide-content{padding:0 19px 25px}.article-kicker{font-size:11px}h1{font-size:31px;letter-spacing:-.8px}.article-intro{font-size:15px}.guide-location{display:block;padding:12px;margin-block:20px}.guide-location>span{display:block;margin-bottom:4px}.guide-figure{margin-bottom:28px;border-radius:8px}.guide-figure figcaption{padding:10px 12px}.guide-steps li{font-size:14px;padding-left:38px}.guide-options>div{padding:13px 0;font-size:13px}.guide-example{padding:12px}.guide-example p{font-size:12px}.copy-expression{min-height:44px}.guide-related a{min-height:44px}.guide-practice{padding:17px}.guide-practice p{font-size:14px}article section{margin-top:27px}dialog{padding:15px}dialog header{gap:10px}dialog .guide-button{min-height:44px}#guide-image-title{font-size:14px}.guide-image-scroll{max-height:calc(100dvh - 210px)}}
@media(prefers-reduced-motion:no-preference){.guide-button,.guide-group a{transition:background .12s ease,border-color .12s ease}}
@media(forced-colors:active){.guide-button,.guide-practice,.guide-group a[aria-current=page]{border:1px solid CanvasText}.guide-steps li:before{border:1px solid CanvasText}.guide-math{color:CanvasText}}
@media print{.guide-header,.guide-sidebar,.guide-reading-toolbar,.guide-pagination,.guide-footer,.guide-related,.copy-expression,.image-hint,.guide-skip,dialog,.guide-scrim{display:none!important}.guide-layout{display:block}#guide-content{padding:0;max-width:none}.guide-figure{break-inside:avoid}.guide-figure img{width:auto;max-height:330px;margin-inline:auto}.guide-options>div{break-inside:avoid}h1{font-size:28px}h2{break-after:avoid}.guide-math{overflow:visible}a{color:inherit;text-decoration:none}body{font-size:12px}}