:root { color-scheme: light; font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; color: #17202f; background: #f7f8fa; font-synthesis: none; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { min-width: 320px; margin: 0; background: #f7f8fa; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-underline-offset: 3px; }
.site-header { border-bottom: 1px solid #e1e6ec; background: rgb(247 248 250 / .94); }
.site-header-inner { width: min(1180px, calc(100% - 48px)); min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; margin: 0 auto; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: #17202f; font-size: 16px; font-weight: 720; letter-spacing: -.025em; text-decoration: none; }
.brand-mark { width: 19px; height: 19px; display: grid; place-items: center; border: 1px solid #4d5662; transform: rotate(45deg); }
.brand-mark i { width: 6px; height: 6px; background: #4d5662; }
.site-header nav, .site-footer nav { display: flex; align-items: center; gap: 24px; }
.site-header nav a { color: #566272; font-size: 12px; font-weight: 600; text-decoration: none; }
.site-header nav a:hover { color: #17202f; }
.site-header .nav-cta { min-height: 38px; display: inline-flex; align-items: center; padding: 0 15px; border-radius: 7px; color: #fff; background: #303840; }
.guide-language-notice { width: min(1180px, calc(100% - 48px)); margin: 14px auto 0; padding: 11px 14px; border: 1px solid #dce2e8; border-radius: 7px; color: #5d6978; background: #fff; font-size: 12px; line-height: 1.55; }
.index-main, .article-shell { width: min(1080px, calc(100% - 48px)); margin: 0 auto; }
.index-hero { max-width: 850px; padding: 110px 0 92px; }
.index-hero > span, .section-heading span, .article-hero .eyebrow, .product-cta > div > span { color: #697585; font-size: 11px; font-weight: 720; letter-spacing: .12em; text-transform: uppercase; text-decoration: none; }
.index-hero h1 { max-width: 800px; margin: 18px 0 22px; color: #17202f; font-size: clamp(42px, 6vw, 70px); line-height: 1.04; letter-spacing: -.038em; text-wrap: balance; }
.index-hero p { max-width: 690px; margin: 0; color: #536071; font-size: 16px; line-height: 1.75; text-wrap: pretty; }
.category-nav { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 34px; }
.category-nav a { min-height: 38px; display: inline-flex; align-items: center; padding: 0 13px; border: 1px solid #cfd6de; border-radius: 7px; color: #4f5b69; background: #fff; font-size: 11px; font-weight: 650; text-decoration: none; }
.category-nav a:hover { color: #17202f; border-color: #8c97a4; }
.guide-index { padding: 0 0 100px; }
.section-heading { min-height: 86px; display: flex; align-items: end; justify-content: space-between; gap: 24px; padding-bottom: 20px; border-bottom: 1px solid #cfd6de; }
.section-heading h2 { max-width: 680px; margin: 7px 0 0; font-size: 22px; letter-spacing: -.025em; }
.section-heading > strong { color: #8a95a3; font-size: 36px; font-weight: 450; }
.section-heading > a { color: #536071; font-size: 12px; font-weight: 650; text-decoration: none; }
.guide-category { padding-top: 68px; scroll-margin-top: 24px; }
.category-heading { display: flex; align-items: end; justify-content: space-between; gap: 28px; padding-bottom: 22px; }
.category-heading h2 { margin: 0; font-size: 28px; letter-spacing: -.025em; }
.category-heading p { max-width: 620px; margin: 8px 0 0; color: #667282; font-size: 13px; line-height: 1.6; }
.category-heading > a { flex: 0 0 auto; color: #536071; font-size: 11px; font-weight: 650; text-decoration: none; }
.category-heading > a:hover { color: #17202f; text-decoration: underline; }
.category-hero > a { display: inline-block; margin-bottom: 22px; color: #5e6977; font-size: 11px; font-weight: 650; text-decoration: none; }
.category-hero h1 { margin-top: 0; }
.guide-list { border-bottom: 1px solid #cfd6de; }
.guide-row { min-height: 164px; display: grid; grid-template-columns: 56px minmax(0, 1fr) 40px; gap: 20px; align-items: start; padding: 28px 0; border-top: 1px solid #e0e5ea; }
.guide-list .guide-row:first-child { border-top: 0; }
.guide-number, .guide-row > div > p:first-child { color: #7a8695; font-size: 10px; font-weight: 650; letter-spacing: .04em; }
.guide-row h2 { margin: 7px 0 8px; font-size: 22px; line-height: 1.28; letter-spacing: -.025em; text-wrap: balance; }
.guide-row h2 a { text-decoration: none; }
.guide-row h2 a:hover { text-decoration: underline; }
.guide-row > div > p { max-width: 710px; margin: 0; color: #5d6978; font-size: 13px; line-height: 1.6; }
.guide-row .row-arrow { width: 40px; height: 40px; display: grid; place-items: center; border: 1px solid #d6dde4; border-radius: 50%; color: #4f5b69; text-decoration: none; transition: border-color .18s ease, transform .18s ease; }
.guide-row:hover .row-arrow { border-color: #838e9b; transform: translate(2px, -2px); }
.article-shell { width: min(1120px, calc(100% - 48px)); }
.article-hero { max-width: 900px; padding: 92px 0 70px; }
.article-hero h1 { margin: 20px 0 24px; font-size: clamp(40px, 5.8vw, 68px); line-height: 1.04; letter-spacing: -.038em; text-wrap: balance; }
.article-hero .dek { max-width: 760px; margin: 0; color: #536071; font-size: 18px; line-height: 1.68; text-wrap: pretty; }
.article-meta { display: flex; gap: 18px; margin-top: 30px; color: #74808f; font-size: 11px; }
.article-grid { display: grid; grid-template-columns: 190px minmax(0, 720px); gap: 72px; align-items: start; padding: 58px 0 90px; border-top: 1px solid #cfd6de; }
.article-rail { position: sticky; top: 28px; display: grid; gap: 16px; color: #657181; font-size: 11px; line-height: 1.5; }
.article-rail a { font-weight: 650; text-decoration: none; }
.article-rail > span { width: 34px; height: 1px; background: #b8c0ca; }
.article-rail p { margin: 0; }
.article-body { min-width: 0; color: #303b49; font-family: Georgia, "Noto Serif JP", "Yu Mincho", serif; font-size: 17px; line-height: 1.85; }
.article-body .lead { margin-top: 0; color: #25303d; font-size: 21px; line-height: 1.72; }
.article-body h2 { margin: 62px 0 16px; color: #17202f; font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; font-size: 27px; line-height: 1.3; letter-spacing: -.025em; text-wrap: balance; scroll-margin-top: 24px; }
.article-body h3 { margin: 38px 0 12px; color: #273240; font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; font-size: 19px; }
.article-body p { margin: 0 0 20px; }
.article-body ul, .article-body ol { margin: 18px 0 26px; padding-left: 1.35em; }
.article-body li { margin: 7px 0; padding-left: .25em; }
.article-body strong { color: #1e2936; }
.guide-note { margin: 34px 0; padding: 22px 24px; border: 1px solid #d9dfe5; color: #34404d; background: #eef1f3; }
.guide-note strong { font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; font-size: 12px; letter-spacing: .02em; }
.guide-note p { margin: 7px 0 0; font-size: 15px; line-height: 1.7; }
.example { margin: 28px 0; padding: 20px 22px; border: 1px solid #d7dde3; background: #fff; }
.example > span { color: #727e8d; font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; font-size: 10px; font-weight: 720; letter-spacing: .08em; text-transform: uppercase; }
.example p { margin: 9px 0 0; font-size: 15px; line-height: 1.75; }
.example.good { border-left: 3px solid #5f796a; }
.article-body table { width: 100%; margin: 28px 0; border-collapse: collapse; font-size: 14px; line-height: 1.6; }
.article-body th, .article-body td { padding: 12px 14px; border-bottom: 1px solid #d7dde3; text-align: left; vertical-align: top; }
.article-body th { color: #26313f; background: #eef1f3; font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; font-size: 11px; }
.sources { margin-top: 68px; padding-top: 28px; border-top: 1px solid #d7dde3; }
.sources h2 { margin-top: 0; font-size: 19px; }
.sources ul { padding-left: 1.1em; }
.sources a { color: #46586b; font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif; font-size: 12px; overflow-wrap: anywhere; }
.product-cta { display: flex; align-items: end; justify-content: space-between; gap: 40px; margin-bottom: 100px; padding: 42px; color: #fff; background: #303840; }
.product-cta h2 { max-width: 620px; margin: 11px 0 10px; font-size: 31px; line-height: 1.2; letter-spacing: -.035em; text-wrap: balance; }
.product-cta p { max-width: 610px; margin: 0; color: #d9dee3; font-size: 13px; line-height: 1.6; }
.product-cta > div > span { color: #bfc7cf; }
.product-cta > a { min-height: 44px; flex: 0 0 auto; display: inline-flex; align-items: center; gap: 18px; padding: 0 17px; border-radius: 7px; color: #303840; background: #fff; font-size: 12px; font-weight: 720; text-decoration: none; }
.related { padding-bottom: 100px; }
.site-footer { width: min(1180px, calc(100% - 48px)); min-height: 160px; display: flex; align-items: center; justify-content: space-between; gap: 30px; margin: 0 auto; border-top: 1px solid #d7dde3; }
.site-footer p { margin: 8px 0 0; color: #6d7887; font-size: 11px; }
.site-footer nav a { color: #5c6877; font-size: 11px; text-decoration: none; }
@media (max-width: 760px) {
  .guide-language-notice { width: calc(100% - 28px); }
  .site-header-inner, .index-main, .article-shell, .site-footer { width: min(100% - 28px, 1120px); }
  .site-header-inner { min-height: 64px; }
  .site-header nav { gap: 13px; }
  .site-header nav > a:first-child { display: none; }
  .site-header .nav-cta { min-height: 38px; padding-inline: 11px; }
  .index-hero { padding: 72px 0 60px; }
  .index-hero h1 { margin-top: 14px; font-size: 40px; line-height: 1.08; }
  .index-hero p { font-size: 14px; line-height: 1.7; }
  .section-heading { min-height: 76px; align-items: end; }
  .section-heading h2 { font-size: 18px; }
  .category-nav { margin-top: 26px; }
  .guide-category { padding-top: 48px; }
  .category-heading { display: block; }
  .category-heading h2 { font-size: 23px; }
  .category-heading > a { display: inline-block; margin-top: 14px; }
  .guide-row { min-height: 0; grid-template-columns: 30px minmax(0, 1fr) 34px; gap: 10px; padding: 24px 0; }
  .guide-row h2 { font-size: 18px; }
  .guide-row > div > p:last-child { display: none; }
  .guide-row .row-arrow { width: 34px; height: 34px; }
  .article-hero { padding: 68px 0 50px; }
  .article-hero h1 { margin: 16px 0 20px; font-size: 39px; line-height: 1.08; }
  .article-hero .dek { font-size: 16px; }
  .article-grid { display: block; padding: 38px 0 68px; }
  .article-rail { position: static; display: flex; align-items: center; margin-bottom: 34px; }
  .article-rail p { display: none; }
  .article-body { font-size: 16px; line-height: 1.82; }
  .article-body .lead { font-size: 19px; }
  .article-body h2 { margin-top: 48px; font-size: 23px; }
  .article-body table { display: block; overflow-x: auto; font-size: 13px; }
  .product-cta { display: block; margin-bottom: 72px; padding: 28px 24px; }
  .product-cta h2 { font-size: 25px; }
  .product-cta > a { width: 100%; justify-content: space-between; margin-top: 26px; }
  .related { padding-bottom: 72px; }
  .site-footer { min-height: 180px; align-items: flex-start; flex-direction: column; justify-content: center; }
  .site-footer nav { flex-wrap: wrap; gap: 16px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .guide-row .row-arrow { transition: none; } }
@media print { .site-header, .site-footer, .product-cta, .related, .article-rail { display: none; } body { background: #fff; } .article-shell { width: 100%; } .article-hero { padding: 20px 0 30px; } .article-grid { display: block; padding-top: 30px; } }