:root{--blue:#073ac5;--paper:#f3f0e7;--ink:#173057;--line:#cdd2cf}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0;background:var(--paper);color:var(--ink);font-family:'Noto Sans JP',sans-serif;font-size:16px;line-height:1.9}a{color:inherit;text-underline-offset:5px}a:hover{color:var(--blue)}a:focus-visible{outline:3px solid var(--blue);outline-offset:5px}img{display:block;max-width:100%;height:auto}h1,h2,h3,p{margin:0}h1,h2,h3{color:var(--blue);line-height:1.55;letter-spacing:-.035em;overflow-wrap:anywhere}.skip{position:absolute;top:-100px;left:20px;z-index:20;padding:12px 20px;background:white}.skip:focus{top:10px}.read-header,.read-breadcrumb,main>section,.reading-hero,.article-hero,.article-layout,.read-footer{max-width:1200px;width:calc(100% - 96px);margin-inline:auto}.read-header{display:flex;justify-content:space-between;align-items:center;gap:24px;padding-block:25px;border-bottom:1px solid 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1fr;gap:48px;align-items:center;padding:40px 0 65px;border-bottom:1px solid var(--line)}.article-hero h1{font-size:clamp(27px,3.1vw,40px);margin:18px 0 25px;font-weight:900}.article-hero>img{border-radius:5px;width:100%}.article-meta{font-size:11px;line-height:2}.article-meta span{display:block}.article-layout{display:grid;grid-template-columns:245px minmax(0,1fr);gap:65px;padding-top:55px;align-items:start}.read-toc{position:sticky;top:28px;font-size:12px;line-height:1.7}.read-toc>p{font-weight:800;color:var(--blue);padding-bottom:15px;border-bottom:1px solid var(--blue)}.read-toc a{display:flex;gap:12px;text-decoration:none;padding:13px 0;border-bottom:1px solid var(--line)}.read-toc a span{font-size:10px;color:var(--blue);padding-top:2px}.article-body{min-width:0;max-width:780px}.article-answer{padding:30px;background:#fffdf7;border-left:4px solid var(--blue);margin-bottom:50px}.article-answer>p:last-child{font-size:19px;line-height:1.9;font-weight:700;margin-top:12px}.article-body section{margin-bottom:55px;scroll-margin-top:30px}.section-number{font-size:11px;color:var(--blue);letter-spacing:.12em;margin-bottom:7px}.article-body h2{font-size:26px;margin-bottom:24px}.article-body p+p{margin-top:19px}.article-body li{padding-left:5px;margin:10px 0}.article-body ul,.article-body ol{padding-left:1.5em;margin:20px 0}.article-body strong{font-weight:800}.article-body a{color:var(--blue);overflow-wrap:anywhere}.article-body table{width:100%;border-collapse:collapse;font-size:14px;line-height:1.8;table-layout:fixed;margin:22px 0}.article-body th{background:var(--blue);color:white;text-align:left;font-weight:700}.article-body th,.article-body td{border-bottom:1px solid var(--line);padding:14px 12px;vertical-align:top;overflow-wrap:anywhere}.article-body td{background:#fffaf2}.table-wrap{max-width:100%;min-width:0}.worked-example{background:#e8edf5;border-radius:5px;padding:26px;margin:26px 0}.example-label{font-size:12px;letter-spacing:.05em;font-weight:800;color:var(--blue);margin-bottom:18px}.article-body pre{font-family:inherit;white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:2;background:#fffdf7;border:1px solid var(--line);padding:24px;border-radius:4px;margin:24px 0}.article-editorial{font-size:12px;border-top:1px solid var(--line);padding-top:22px}.read-cta{background:var(--blue);color:white;padding:45px 50px;margin-top:80px!important;border-radius:5px}.read-cta .read-category,.read-cta h2{color:white}.read-cta h2{font-size:clamp(24px,2.6vw,34px);margin:15px 0 20px}.read-cta>p:not(.read-category){max-width:53em}.read-button{display:inline-flex;gap:40px;align-items:center;border-radius:30px;padding:12px 24px;background:var(--paper);color:var(--blue);font-weight:800;font-size:14px;text-decoration:none;margin:25px 20px 15px 0}.read-cta-link{font-size:13px}.read-cta a:hover{color:inherit;text-decoration:underline}.read-cta .read-button:hover{color:var(--blue)}.read-cta a:focus-visible{outline-color:white}.read-small{font-size:11px;opacity:.9;line-height:1.9;margin-top:15px}.related-reading{margin-top:70px!important}.related-reading>h2{font-size:30px;margin:10px 0 30px}.related-grid{grid-template-columns:repeat(2,minmax(0,1fr));max-width:800px}.read-footer{margin-top:80px;padding:35px 0;display:flex;align-items:center;gap:24px;flex-wrap:wrap;border-top:1px solid var(--line)}.read-footer p,.read-footer small,.read-footer nav{font-size:11px}.read-footer nav{display:flex;gap:22px;margin-left:auto}.read-footer small{width:100%;color:var(--blue)}@media(max-width:1000px){.article-layout{grid-template-columns:200px minmax(0,1fr);gap:35px}.read-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.article-hero{gap:30px}.read-header,.read-breadcrumb,main>section,.reading-hero,.article-hero,.article-layout,.read-footer{width:calc(100% - 56px)}.reading-hero{gap:25px 35px}.reading-hero>div p:first-child{font-size:18px}.article-body table{font-size:13px}.article-body th,.article-body td{padding:10px 7px}}@media(max-width:700px){body{font-size:15px}.read-header,.read-breadcrumb,main>section,.reading-hero,.article-hero,.article-layout,.read-footer{width:calc(100% - 40px)}.read-header{padding-block:18px;gap:10px}.brand{font-size:19px;gap:6px}.brand img{width:38px}.read-header nav{gap:13px;font-size:11px}.read-header nav>a:nth-child(2){display:none}.read-contact{padding:6px 10px}.reading-hero{display:block;padding:30px 0 45px}.reading-hero h1{font-size:38px;margin:20px 0 30px}.reading-hero>div p:first-child{font-size:18px;margin-bottom:15px}.reading-list-head{gap:15px}.reading-list-head h2{font-size:17px}.reading-list-head span{font-size:9px;white-space:nowrap}.read-grid{grid-template-columns:1fr;gap:32px}.read-card h2{font-size:23px}.read-card-text{padding:18px 0 25px}.article-hero{display:flex;flex-direction:column;gap:25px;padding:25px 0 35px}.article-hero h1{font-size:29px;line-height:1.6}.article-hero .read-category{font-size:10px}.article-layout{display:block;padding-top:30px}.read-toc{position:static;margin-bottom:35px}.read-toc a{padding:11px 0}.article-answer{padding:22px 20px;margin-bottom:40px}.article-answer>p:last-child{font-size:17px}.article-body h2{font-size:23px}.article-body section{margin-bottom:40px}.article-body table{font-size:12px;line-height:1.8}.article-body th,.article-body td{padding:10px 7px}.worked-example{padding:20px 15px}.article-body pre{padding:17px 14px;font-size:13px}.read-cta{padding:30px 24px;margin-top:50px!important}.read-button{gap:16px;padding:12px 18px;margin-right:0;font-size:13px}.read-cta-link{display:block}.related-reading{margin-top:50px!important}.read-footer{margin-top:55px;gap:15px}.read-footer nav{width:100%;margin-left:0;gap:20px;flex-wrap:wrap}.read-small{font-size:11px}}@media(max-width:360px){.read-header,.read-breadcrumb,main>section,.reading-hero,.article-hero,.article-layout,.read-footer{width:calc(100% - 32px)}.read-header nav{gap:10px}.read-contact{padding:5px 8px}.brand{font-size:17px}.brand img{width:32px}.reading-hero h1{font-size:33px}.article-hero h1{font-size:26px}.article-body table{font-size:11px}.article-body th,.article-body td{padding:8px 5px}.worked-example{padding:18px 12px}.read-cta{padding:26px 20px}.read-button{padding:11px 14px;font-size:12px}.reading-list-head h2{font-size:15px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}

h1,h2{text-wrap:balance}
.article-supplement{margin:20px 0;border:1px solid var(--line);border-radius:4px;background:#fffdf7;min-width:0}
.article-supplement summary{cursor:pointer;padding:13px 16px;min-height:48px;color:var(--blue);font-size:14px;font-weight:700;overflow-wrap:anywhere}
.article-supplement summary:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
.article-body .article-supplement pre{border:0;margin:0;padding-top:8px}
.sheet-example{font-size:14px}
/* Keep editorial controls usable without making the artwork or spacing large. */
.read-header nav a{display:inline-flex;align-items:center;min-height:44px}
.read-footer nav a{display:inline-flex;align-items:center;min-height:44px}
.read-header nav,.read-footer nav{flex-wrap:wrap}
.read-header,.read-header nav,.read-cta,.read-toc{min-width:0}
.read-cta p,.read-button,.read-cta-link{overflow-wrap:anywhere}
.read-cta-link{display:inline-flex;align-items:center;min-height:44px}
.read-button,.worksheet-download{max-width:100%}
.mascot-check>div{min-width:0}
@media(min-width:701px) and (max-width:1000px){
 .article-layout{display:block;max-width:780px}
 .read-toc{position:static;margin-bottom:32px}
 .article-body{max-width:none}
 .article-answer{margin-bottom:28px}
 .article-body table{font-size:14px}
 .article-hero{grid-template-columns:minmax(0,1fr) 220px}
}
@media(max-height:650px){.read-toc{position:static}}
@media(max-width:700px){
 .read-header{padding-block:12px;flex-wrap:wrap}
 .read-header nav{margin-left:auto;gap:12px}
 .read-breadcrumb{padding-block:15px}
 .reading-hero{padding:18px 0 28px}
 .reading-hero h1{font-size:clamp(28px,8vw,34px);margin:14px 0 20px}
 .reading-hero>div p:first-child{font-size:16px;margin-bottom:12px}
 .reading-list-head{padding:18px 0;flex-wrap:wrap}
 .read-grid{gap:20px}
 .read-card>a{display:grid;grid-template-columns:clamp(88px,25vw,112px) minmax(0,1fr);gap:15px;align-items:start;padding-bottom:18px}
 .read-card img{object-fit:contain;margin-top:4px}
 .read-card-text{padding:0;min-width:0}
 .read-card h2{font-size:18px;line-height:1.6;margin:7px 0 10px}
 .read-card-text>p:not(.read-category){font-size:13px;line-height:1.8}
 .read-card .read-category{font-size:10px;letter-spacing:.04em}
 .read-more{margin-top:12px;min-height:24px}
 .article-hero{gap:16px;padding:16px 0 24px;align-items:stretch}
 .article-hero h1{font-size:clamp(24px,6.5vw,28px);margin:12px 0 16px}
 .article-hero>img{max-width:240px;align-self:center}
 .article-layout{padding-top:24px}
 .article-answer{padding:18px 16px}
 .article-answer>p:last-child{font-size:16px}
 .read-toc a{min-height:44px}
 .article-body h2{font-size:22px;margin-bottom:20px}
 .article-body pre{font-size:14px;line-height:1.85}
 .read-cta-link{display:flex;width:fit-content}
 .related-reading>h2{font-size:25px}
}
@media(max-width:480px){.article-body table{font-size:14px;table-layout:auto}.article-body thead{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.article-body tbody,.article-body tr{display:block}.article-body tr{margin-bottom:15px;border-top:2px solid var(--blue)}.article-body td{display:grid;grid-template-columns:5.3em minmax(0,1fr);gap:12px;padding:12px 10px}.article-body td:before{content:attr(data-label);color:var(--blue);font-size:12px;font-weight:700}.article-body td:first-child{background:#e3e8ee;font-weight:700}}

.article-layout{row-gap:0}.article-layout>.article-answer{grid-column:2;grid-row:1}.article-layout>.read-toc{grid-column:1;grid-row:1/span 2}.article-layout>.article-body{grid-column:2;grid-row:2}@media(max-width:700px){.article-layout>.article-answer{margin-bottom:28px}.article-layout>.read-toc{margin-bottom:38px}}
.article-body h3{font-size:20px;margin:34px 0 18px;line-height:1.7}.article-photo{margin:35px 0 42px}.article-photo>img{width:100%;border-radius:5px;aspect-ratio:3/2;object-fit:cover}.article-photo figcaption{color:#4d5c6d;font-size:12px;line-height:1.8;padding-top:12px}.article-photo figcaption span{display:block;font-size:11px;margin-top:4px}.mascot-check{display:flex;align-items:center;gap:24px;border-block:1px solid var(--line);padding:24px 0;margin:30px 0}.mascot-check>img{width:100px;flex:0 0 100px}.mascot-check p{font-size:14px}.mascot-check .example-label{margin-bottom:8px}.worksheet-download{display:inline-block;border:1px solid var(--blue);padding:12px 18px;border-radius:4px;font-size:14px;font-weight:700}@media(max-width:700px){.article-body h3{font-size:19px}.article-photo{margin:28px 0 34px}.mascot-check{gap:14px;align-items:flex-start}.mascot-check>img{width:66px;flex-basis:66px}.mascot-check p{font-size:13px}.worksheet-download{padding:12px;font-size:13px}}
.article-hero>img{max-width:420px;justify-self:center}
.article-photo{max-width:640px;margin-inline:auto}
@media(min-width:701px){
 .article-hero h1{font-size:clamp(27px,3vw,38px)}
 .reading-hero h1{font-size:clamp(34px,4.7vw,58px)}
}
@media(max-width:700px){
 .article-hero h1{font-size:clamp(23px,6.2vw,26px)}
 .article-hero>img{max-width:220px}
 .reading-hero h1{font-size:clamp(27px,7.5vw,32px)}
 .read-card h2{font-size:17px}
 .article-photo{max-width:320px}
 .related-reading>h2{font-size:23px}
}