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@media(max-width:360px){.home-intro h1,.article-intro h1{font-size:27px}.search-hints{gap:0 10px}.reading-column h2{font-size:22px}.formula-box code{font-size:13px}.article-actions{gap:19px}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}.toast{transition:none}}

/* Modern refinement of the selected reference A. */
:root{--ink:#18352e;--muted:#526660;--green:#176b55;--paper:#fff;--soft:#f3f7f5;--line:#dce6e0;--header:#112d27;--accent:#b84e25;--selection:#d5eadd;--surface-radius:12px;--control-radius:6px}
body{letter-spacing:.005em}h1,h2,h3{letter-spacing:-.025em}
.wrap{width:min(1140px,calc(100% - 80px))}
.site-header{min-height:78px}.header-inner{width:min(1260px,calc(100% - 64px));min-height:78px;gap:28px}
.brand{font-size:25px;font-weight:650;letter-spacing:-.025em}
.site-header nav{gap:30px;font-size:14px}.site-header nav a{color:#e5eee9;transition:color .16s ease-out}
.site-header nav a:hover{color:white;text-decoration-color:#91c6ad}.site-header nav a[aria-current]{text-decoration-color:#91c6ad;text-underline-offset:9px}
.preview-label{font-size:11px;letter-spacing:.02em;color:#b3c7bd}.header-search{color:#e5eee9}
.home-hero{gap:68px;padding-block:64px 57px;align-items:center}
.home-intro h1{font-size:clamp(34px,3.3vw,46px);font-weight:650;line-height:1.5;letter-spacing:-.035em}.title-accent{color:var(--green)}
.home-intro .lead{margin-top:23px;line-height:1.95;max-width:none;text-wrap:balance}
.search-form{border-color:#bbcfc3;border-radius:var(--control-radius);overflow:hidden;min-height:54px;margin-top:30px}
.search-form input{padding:12px 15px}.search-form button{font-weight:600}.search-form:focus-within{outline:2px solid var(--green);outline-offset:3px}
.search-hints{margin-top:5px;gap:0 17px}.search-hints button{font-size:12px;text-decoration-color:#a1beb0}
.button,.text-link{font-weight:600;text-decoration-thickness:1px;text-decoration-color:#96b6a7}
.button:hover,.text-link:hover{text-decoration-color:var(--green)}.button svg,.text-link svg,.example-link svg{transition:transform .18s cubic-bezier(.16,1,.3,1)}
.button:hover svg,.text-link:hover svg,.example-link:hover svg{transform:translateX(3px)}.button:disabled svg{transform:none}
.intro-link{margin-top:19px;font-size:15px}
.example-heading{margin-bottom:15px}.example-heading strong{font-size:18px;font-weight:600}
.sheet-demo{border-color:var(--line);border-radius:var(--surface-radius)}
.sheet-title{background:var(--soft);padding:11px 15px;font-size:12px}.sheet-formula{padding:11px 13px;gap:14px}.sheet-formula code{font-size:12px}
.sheet-demo th,.sheet-demo td{padding:11px 13px}.sheet-demo th:first-child{background:#fafcfb}.sheet-demo .column-letters th{background:#fafcfb}
.sheet-demo thead tr:last-child{background:#e9f2ed}.sheet-demo tbody tr:last-child>*{border-bottom:0}
.sheet-demo .duplicate{background:#fcf0e6;color:var(--orange)}.sheet-foot{border-top:1px solid var(--line);padding:11px 14px;background:#fcfdfc;font-size:11px}
.example-link{font-size:13px;text-decoration-color:#96b6a7;margin-top:7px;gap:12px}
.resource-section{padding-block:40px 49px}.section-heading h2,.function-layout h2{font-size:25px;font-weight:600;line-height:1.6}.section-heading p{font-size:13px}
.guide-row{padding-top:25px}.guide-row h3{font-size:25px;font-weight:600;color:var(--ink)}.guide-row:hover h3{color:var(--green)}
.guide-row p{line-height:1.9}.inline-meta{margin-top:12px;font-size:12px}
.function-section{padding-block:39px;background:var(--soft)}.function-layout{gap:65px}.function-row>code{font-weight:600;text-decoration-thickness:1px;text-decoration-color:#96b6a7}.function-row h3{font-weight:600}
.downloads-section{padding-block:46px}.download-row{padding-top:25px}.download-row h3{font-weight:600}
.about-section{padding-block:40px 49px;gap:80px}.about-section h2{font-size:23px;font-weight:600}.next-topics h3{font-weight:600}.site-footer{padding-inline:max(40px,calc((100% - 1140px)/2));background:#fafcfb}.footer-brand{font-size:21px}
.breadcrumb{padding-block:17px;font-size:12px}.breadcrumb a{text-decoration-color:#a1beb0}
.article-hero.wrap{padding:48px max(40px,calc((100% - 1140px)/2)) 43px;gap:62px;grid-template-columns:minmax(0,.93fr) minmax(0,1.07fr)}
.article-intro h1{font-size:clamp(32px,3vw,42px);font-weight:650;line-height:1.55;letter-spacing:-.03em}
.article-intro .lead{font-size:17px;line-height:1.95;margin-top:24px}.article-meta{font-size:12px;margin-top:22px}.article-actions{gap:24px;margin-top:12px}
.related-reference{margin-top:23px}.related-reference p{font-weight:500;color:var(--muted);font-size:12px}.related-reference nav{gap:22px}.related-reference a{font-weight:550;font-size:14px;text-decoration-color:#96b6a7}
.demo-controls{gap:24px;margin-top:8px}.demo-status{font-size:12px;line-height:1.9}
.reading-layout{grid-template-columns:minmax(0,730px) 210px;gap:75px;padding-top:49px}.contents nav{border-top:0;border-left:1px solid var(--line);padding:0 0 0 21px;gap:2px}
.contents h2{font-size:13px;font-weight:600;margin-bottom:14px;color:var(--ink)}.contents a{font-size:13px;position:relative;font-weight:400}
.contents a[aria-current=location]{color:var(--green);font-weight:600;text-decoration:none}.contents a[aria-current=location]::before{content:"";position:absolute;left:-22px;top:12px;bottom:12px;width:1px;background:var(--green)}
.reading-column h2{font-size:26px;font-weight:600;line-height:1.6;margin-bottom:21px}.reading-column h3{font-weight:600}.reading-column p{line-height:2}
.formula-box{border:1px solid var(--line);border-radius:var(--control-radius);background:white;overflow:hidden}
.formula-bar{padding:5px 10px 4px 17px;background:white;font-size:12px}
.formula-box pre{background:#edf4ef;padding:18px 17px 21px}.formula-box code{color:#1b4e3d}
.copy-button{font-weight:500;font-size:12px;text-decoration-color:#96b6a7;border-radius:var(--control-radius)}.copy-button:hover{background:var(--soft)}.copy-button.copied{background:var(--soft);color:var(--green)}
.plain-note{padding-top:21px}.plain-note strong{font-weight:600}.step-number{font-weight:550}.formula-parts strong{font-weight:600}
.faq summary{font-weight:550}.faq summary:hover{color:var(--green)}.practice-section{padding-top:29px}.source-section p{font-size:12px}.toast{border-radius:var(--control-radius)}
@media(max-width:1050px){.wrap{width:calc(100% - 56px)}.home-hero{gap:38px;padding-block:48px}.home-intro h1{font-size:37px}.article-hero.wrap{padding-inline:28px;gap:35px}.article-intro h1{font-size:34px}.reading-layout{grid-template-columns:minmax(0,1fr) 180px;gap:40px}.function-layout{gap:35px}}
@media(max-width:900px){.home-hero{grid-template-columns:1fr;align-items:start;gap:33px;padding-block:39px}.home-intro h1{font-size:38px}.home-intro .lead{max-width:620px}.article-hero.wrap{grid-template-columns:1fr;padding-top:32px;gap:30px}.article-intro h1{font-size:36px}.related-reference{margin-top:15px}.reading-layout{grid-template-columns:minmax(0,1fr);gap:28px}.contents nav{border-left:0;border-bottom:1px solid var(--line);padding:0 0 22px;gap:4px 15px}.contents a[aria-current=location]{text-decoration:underline}.contents a[aria-current=location]::before{display:none}.function-layout{gap:20px}}
@media(max-width:700px){.wrap{width:calc(100% - 36px)}.site-header,.header-inner{min-height:108px}.header-inner{width:calc(100% - 36px);padding-block:7px 2px;gap:0}.brand{font-size:23px}.site-header nav{font-size:13px;gap:12px;border-color:#355248}.site-header nav a[aria-current]{text-underline-offset:6px}
 .home-hero{padding-block:33px 36px;gap:29px}.home-intro h1{font-size:31px;line-height:1.5}.home-intro .lead{margin-top:18px;font-size:16px;line-height:1.95}.search-form{margin-top:23px}.search-hints{gap:0 12px}.intro-link{font-size:14px;margin-top:13px}
 .example-heading{margin-bottom:13px}.example-heading strong{font-size:17px}.sheet-title{padding:10px 11px}.sheet-formula{padding:10px;gap:10px}.sheet-formula code{font-size:11px}.sheet-demo th,.sheet-demo td{padding:10px 9px}.sheet-foot{padding:10px 11px}
 .resource-section{padding-block:31px 35px}.section-heading h2,.function-layout h2{font-size:22px}.guide-row{padding-top:21px}.guide-row h3{font-size:22px}.function-section{padding-block:31px}.function-layout{gap:18px}.downloads-section{padding-block:34px}.download-row{padding-top:21px}.about-section{padding-block:31px 36px;gap:28px}.about-section h2{font-size:22px}.site-footer{padding-inline:18px}.footer-brand{font-size:20px}
 .breadcrumb{padding-block:13px;font-size:11px}.article-hero.wrap{padding:29px 18px 29px;gap:29px}.article-intro h1{font-size:30px;line-height:1.55}.article-intro .lead{font-size:16px;margin-top:18px}.article-meta{font-size:12px;margin-top:18px}.article-actions{margin-top:9px;gap:22px}.related-reference{margin-top:17px}.related-reference nav{gap:22px}
 .reading-layout{padding-top:29px;gap:27px}.contents nav{padding-bottom:20px}.contents a{font-size:14px}.reading-column h2{font-size:24px;margin-bottom:19px}.reading-column h3{font-size:19px}.formula-bar{padding:5px 7px 4px 12px}.formula-box pre{padding:17px 12px 19px}.formula-box code{font-size:14px}.source-section p{font-size:12px}}
@media(max-width:360px){.home-intro h1,.article-intro h1{font-size:27px}.reading-column h2{font-size:22px}.formula-box code{font-size:13px}}
@media(prefers-reduced-motion:reduce){.site-header nav a,.button svg,.text-link svg,.example-link svg{transition:none}.button:hover svg,.text-link:hover svg,.example-link:hover svg{transform:none}}