:root {
  color-scheme: light;
  --ink: #1c302c;
  --muted: #5d6a63;
  --line: #d6ddd3;
  --paper: #fbfcf8;
  --soft: #edf1e8;
  --accent: #245344;
  --accent-2: #245344;
  --lime: #dceba4;
}
* { box-sizing: border-box; }
html { scroll-padding-top: 24px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Meiryo", system-ui, sans-serif;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-underline-offset: .22em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
::selection { background: var(--lime); color: var(--ink); }
.skip-link { position: absolute; left: 20px; top: -100px; z-index: 10; padding: 10px 18px; background: var(--paper); }
.skip-link:focus { top: 12px; }
.site-header, main, .site-footer { width: min(1184px, calc(100% - 80px)); margin: 0 auto; }
.site-header { display: flex; align-items: center; justify-content: space-between; min-height: 96px; gap: 24px; border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); font-size: 17px; font-weight: 800; letter-spacing: -.03em; text-decoration: none; white-space: nowrap; }
.brand-mark { display: grid; place-items: center; width: 40px; height: 40px; background: var(--accent); color: var(--paper); border-radius: 50%; font-family: Georgia, serif; font-size: 26px; font-weight: 400; letter-spacing: -.07em; padding-right: 3px; }
.site-header nav { display: flex; align-items: center; gap: 28px; font-size: 12px; font-weight: 700; }
.site-header nav a { text-decoration: none; color: var(--ink); padding: 10px 0; }
.site-header nav a:hover { text-decoration: underline; }
main { padding: 0 0 88px; }
.home-intro { display: flex; align-items: flex-end; justify-content: space-between; gap: 36px; padding: 42px 0 32px; }
.home-intro h1 { font-size: clamp(25px, 3vw, 36px); font-weight: 800; letter-spacing: -.055em; line-height: 1.5; margin: 0; text-wrap: balance; }
.home-intro > p { color: var(--muted); font-size: 12px; line-height: 2; margin: 0 0 3px; }
.purpose-nav { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; padding: 17px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.purpose-nav > span { font-size: 11px; font-weight: 700; margin-right: 18px; }
.purpose-nav a { display: inline-flex; align-items: center; justify-content: space-between; gap: 22px; padding: 7px 14px; color: var(--ink); background: var(--soft); text-decoration: none; font-size: 12px; border-radius: 3px; }
.purpose-nav a:hover { background: #e0e9d8; }
.purpose-nav a > span { font-size: 18px; line-height: 1; }
.kicker, .section-number { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 11px; letter-spacing: .15em; font-weight: 700; margin: 0 0 24px; }
.kicker > span { width: 7px; height: 7px; background: var(--accent); border-radius: 50%; }
.cta { display: inline-flex; align-items: center; justify-content: space-between; gap: 36px; background: var(--accent); color: #fff; padding: 13px 24px; font-size: 14px; font-weight: 700; text-decoration: none; border: 1px solid var(--accent); border-radius: 3px; }
.cta:hover { background: #173e32; }
.guide-visual { position: relative; height: 250px; overflow: hidden; background: #e4ebdc; border-radius: 4px; }
.visual-ideas { background: #ece9df; }
.visual-label { position: absolute; left: 24px; top: 18px; font-size: 9px; letter-spacing: .16em; color: #496050; font-weight: 700; }
.visual-sheet { position: absolute; left: 9%; top: 46px; width: 49%; background: var(--paper); padding: 13px 17px 18px; border: 1px solid #ced7c8; border-radius: 5px; transform: rotate(-5deg); box-shadow: 0 8px 0 #1c302c08; }
.sheet-dots { display: block; color: #9eafa1; font-size: 7px; letter-spacing: 3px; padding-bottom: 9px; border-bottom: 1px solid var(--line); }
.sheet-title { display: block; font-family: ui-monospace, monospace; font-size: 11px; font-weight: 700; margin: 8px 0; }
.visual-sheet code { display: block; font-family: ui-monospace, monospace; font-size: 11px; line-height: 1.85; color: #526d5f; }
.visual-arrow { position: absolute; left: 57%; top: 92px; font-family: Georgia, serif; font-size: 40px; color: #66775f; }
.visual-result { position: absolute; right: 7%; top: 87px; width: 36%; min-height: 121px; padding: 15px 18px; background: #234f40; color: #f4f8ec; border-radius: 4px; transform: rotate(6deg); }
.visual-result > span:first-child { font: 9px ui-monospace, monospace; letter-spacing: .12em; color: #dceba4; }
.visual-result strong { display: block; font-size: 14px; line-height: 1.7; white-space: pre-line; margin: 5px 0 12px; }
.result-rule { display: block; height: 3px; background: #afc5a766; width: 82%; margin-top: 5px; }
.result-rule.short { width: 52%; }
.note-line { display: flex; gap: 8px; align-items: center; font-size: 10px; padding: 5px 0; border-bottom: 1px solid #e4e7df; white-space: nowrap; }
.note-line i { font-size: 9px; font-style: normal; color: #67805f; }
.guide-section { padding-top: 32px; scroll-margin-top: 28px; }
.section-heading { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; margin-bottom: 28px; }
.section-number { margin-bottom: 10px; font-size: 10px; }
.section-heading h2, .editorial-note h2 { margin: 0; font-size: clamp(24px, 2.6vw, 32px); letter-spacing: -.045em; line-height: 1.65; }
.section-heading > p { font-size: 12px; color: var(--muted); margin: 0 0 5px; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px; }
.topic-list { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 24px; font-size: 12px; color: var(--muted); }
.topic-list span { padding: 4px 12px; border: 1px solid var(--line); border-radius: 20px; }
.card { position: relative; min-width: 0; border-bottom: 1px solid var(--line); }
.card:hover h2 a { text-decoration: underline; text-decoration-thickness: 1px; }
.card:focus-within { outline: 3px solid var(--accent); outline-offset: 4px; }
.card-content { padding: 20px 0 18px; }
.card h2 { font-size: 21px; line-height: 1.65; margin: 14px 0 12px; letter-spacing: -.035em; text-wrap: balance; }
.card h2 a { color: var(--ink); text-decoration: none; }
.card h2 a::after { content: ""; position: absolute; inset: 0; }
.card-content > p:not(.eyebrow):not(.price) { color: var(--muted); font-size: 13px; line-height: 1.9; margin: 0; }
.eyebrow { color: var(--accent); font-size: 11px; font-weight: 700; margin: 0 0 8px; }
.card .eyebrow { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.eyebrow > span { color: var(--muted); font-size: 9px; font-weight: 400; letter-spacing: .09em; }
.card-read { display: flex; align-items: center; justify-content: space-between; margin-top: 20px; font-size: 11px; font-weight: 700; }
.card-read > span { font-size: 23px; line-height: 1; }
.card-image { display: grid; place-items: center; background: var(--soft); height: 238px; padding: 20px; }
.card-image img { max-width: 100%; height: 100%; object-fit: contain; }
.price { font-weight: 800; }
.other-guides { margin-top: 40px; }
.other-heading { display: flex; gap: 18px; align-items: baseline; margin-bottom: 18px; }
.other-heading h3 { font-size: 18px; margin: 0; letter-spacing: -.02em; }
.other-heading > span { font-size: 11px; color: var(--muted); }
.other-guides .guide-visual { display: none; }
.other-guides .card { background: transparent; }
.other-guides .card h2 { font-size: 18px; }
.editorial-note { display: grid; grid-template-columns: 1fr 1.25fr; gap: 70px; padding: 48px; margin-top: 72px; background: var(--soft); border-radius: 4px; scroll-margin-top: 24px; }
.editorial-note .section-number { margin-bottom: 20px; }
.approach-list > div { display: flex; gap: 20px; padding: 20px 0; border-top: 1px solid #ced7c8; }
.approach-list > div:first-child { border-top: 0; padding-top: 0; }
.approach-list > div:last-child { padding-bottom: 0; }
.approach-list > div > span { font: 11px ui-monospace, monospace; color: #697862; padding-top: 6px; }
.approach-list h3 { font-size: 15px; margin: 0 0 8px; }
.approach-list p { margin: 0; font-size: 12px; line-height: 1.9; color: var(--muted); }
.site-footer { display: flex; justify-content: space-between; align-items: flex-start; gap: 40px; padding: 35px 0 42px; border-top: 1px solid var(--line); font-size: 11px; color: var(--muted); }
.footer-brand { font-size: 17px; font-weight: 800; letter-spacing: -.035em; color: var(--ink); text-decoration: none; }
.site-footer p { margin: 8px 0; }
.footer-details { max-width: 440px; }
.footer-details p { margin: 0 0 10px; }
.breadcrumb { max-width: 780px; margin: 32px auto; font-size: 11px; color: var(--muted); }
.breadcrumb a { text-decoration: none; }
.breadcrumb > span { margin: 0 12px; }
.article { max-width: 780px; margin: 48px auto 0; font-size: 16px; line-height: 2; overflow-wrap: anywhere; }
.breadcrumb + .article { margin-top: 0; }
.article > h1 { font-size: clamp(29px, 3.5vw, 44px); line-height: 1.55; letter-spacing: -.045em; margin: 14px 0 24px; text-wrap: balance; }
.article > h1 + p { color: var(--muted); font-size: 17px; margin-bottom: 36px; }
.article h2 { font-size: 24px; line-height: 1.65; letter-spacing: -.025em; margin: 48px 0 20px; padding-bottom: 13px; border-bottom: 1px solid var(--line); }
.article h3 { font-size: 18px; line-height: 1.8; margin: 30px 0 14px; }
.article p { margin: 16px 0; }
.article li { padding-left: 3px; margin: 9px 0; }
.article ul, .article ol { padding-left: 24px; }
.notice { padding: 12px 16px; border-left: 3px solid #8eaa86; background: var(--soft); color: var(--muted); font-size: 12px; line-height: 1.8; }
.article > .notice:first-child { margin: 0 0 28px; }
.article .eyebrow { font-size: 11px; letter-spacing: .08em; }
.decision-table-wrap { margin: 24px 0; overflow-x: auto; border: 1px solid var(--line); border-radius: 4px; }
.decision-table { border-collapse: collapse; min-width: 580px; width: 100%; font-size: 13px; line-height: 1.9; }
.decision-table th, .decision-table td { padding: 16px 20px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.decision-table tr:last-child th, .decision-table tr:last-child td { border-bottom: 0; }
.decision-table th { background: var(--soft); font-weight: 700; width: 25%; }
.decision-table td { background: #fff; }
.decision-guide-note { color: var(--muted); font-size: 13px; }
.practical-guide pre { padding: 22px 24px; border: 1px solid #263e34; border-radius: 4px; background: #1d3028; color: #edf4e9; overflow-x: auto; max-width: 100%; font-family: ui-monospace, Consolas, monospace; font-size: 13px; line-height: 1.8; tab-size: 4; overflow-wrap: normal; }
.example-disclosure { border-left: 3px solid #829d77; padding-left: 16px; color: var(--muted); font-size: 13px; }
.affiliate-offer { border: 1px solid var(--line); border-radius: 4px; padding: 24px; margin-top: 36px; background: var(--soft); }
.affiliate-offer h2 { margin-top: 0; }
.product-image { display: block; max-height: 400px; max-width: 100%; object-fit: contain; margin: 24px auto; }
@media (max-width: 960px) {
  .site-header, main, .site-footer { width: calc(100% - 48px); }
  .editorial-note { padding: 32px; gap: 36px; }
}
@media (max-width: 700px) {
  .site-header, main, .site-footer { width: calc(100% - 40px); }
  .site-header { min-height: 82px; gap: 12px; flex-wrap: wrap; padding: 17px 0; }
  .brand { font-size: 14px; gap: 8px; }
  .brand-mark { width: 32px; height: 32px; font-size: 22px; }
  .site-header nav { gap: 16px; font-size: 11px; }
  .home-intro { display: block; padding: 28px 0 24px; }
  .home-intro h1 { font-size: 27px; }
  .home-intro > p { margin-top: 14px; font-size: 11px; }
  .purpose-nav { gap: 8px; padding: 14px 0; }
  .purpose-nav > span { width: 100%; font-size: 10px; margin-bottom: 2px; }
  .purpose-nav a { width: 100%; font-size: 11px; padding: 7px 12px; }
  .kicker { font-size: 10px; margin-bottom: 20px; }
  .section-heading { display: block; margin-bottom: 22px; }
  .section-heading > p { margin-top: 10px; font-size: 11px; }
  .guide-section { padding-top: 28px; }
  .grid { grid-template-columns: 1fr; gap: 22px; }
  .card-content { padding: 18px 0; }
  .card h2 { font-size: 20px; }
  .guide-visual { height: 218px; }
  .visual-sheet { top: 36px; }
  .visual-result { top: 75px; width: 40%; padding: 14px; }
  .visual-result strong { font-size: 12px; }
  .other-guides { margin-top: 32px; }
  .editorial-note { grid-template-columns: 1fr; gap: 28px; padding: 26px 22px; margin-top: 44px; }
  .editorial-note h2 { font-size: 27px; }
  .site-footer { flex-direction: column; gap: 24px; padding: 28px 0; }
  main { padding-bottom: 48px; }
  .article { font-size: 15px; margin-top: 32px; }
  .article > h1 + p { font-size: 15px; }
  .article h2 { font-size: 22px; margin-top: 38px; }
  .article h3 { font-size: 17px; }
  .decision-table { min-width: 540px; font-size: 12px; }
  .article > .decision-table-wrap .decision-table { min-width: 0; }
  .article > .decision-table-wrap th:first-child { width: 29%; }
  .article > .decision-table-wrap th:last-child { width: auto; }
  .decision-table th, .decision-table td { padding: 14px; }
  .practical-guide pre { padding: 16px; font-size: 12px; }
  .breadcrumb { margin: 24px auto; }
}