:root {
  --color-main: #3f9f9a;
  --color-main-dark: #176a6b;
  --color-accent: #f1b85f;
  --color-bg: #f3fbfa;
  --color-surface: #ffffff;
  --color-soft: #e8f7f5;
  --color-border: #cfe8e5;
  --color-text: #27353a;
  --color-muted: #607276;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--color-text); font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif; line-height: 1.85; background: var(--color-bg); }
a { color: var(--color-main-dark); }
.site-header, .site-footer { width: min(100%, 1040px); margin: 0 auto; padding: 16px 20px; background: var(--color-surface); }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; border-bottom: 1px solid var(--color-border); }
.brand { color: var(--color-main-dark); font-size: 22px; font-weight: 900; text-decoration: none; }
.global-nav { display: flex; flex-wrap: wrap; gap: 12px; font-size: 14px; }
.global-nav a, .site-footer a { text-decoration: none; }
main { width: min(100%, 1040px); margin: 0 auto; padding: 22px 20px 42px; background: var(--color-surface); }
.home-rich { background: linear-gradient(180deg, #e8f7f5 0, #f3fbfa 340px, #fff 340px); }
.article-rich { background: linear-gradient(180deg, #e8f7f5 0, #f3fbfa 260px, #fff 260px); }
.home-rich .site-header, .article-rich .site-header { margin-top: 14px; border: 1px solid var(--color-border); border-radius: 8px 8px 0 0; }
.home-rich main, .article-rich main { padding: 28px clamp(18px, 4vw, 44px) 54px; border-right: 1px solid var(--color-border); border-left: 1px solid var(--color-border); }
.home-hero { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(320px, .92fr); gap: 18px 30px; align-items: start; padding: 28px; background: #fbfffe; border: 1px solid var(--color-border); border-left: 8px solid var(--color-main); border-radius: 8px; box-shadow: 0 12px 30px rgba(23,106,107,.08); }
.label { display: inline-block; margin: 0 0 10px; padding: 3px 10px; color: var(--color-main-dark); background: #fff; border: 1px solid var(--color-border); font-size: 13px; font-weight: 700; }
.home-hero .label { grid-column: 1 / -1; width: fit-content; margin-bottom: 0; }
h1 { margin: 0 0 12px; color: var(--color-main-dark); font-size: clamp(28px, 5vw, 44px); line-height: 1.35; letter-spacing: 0; }
.home-hero h1 { grid-column: 1 / -1; max-width: 980px; margin-bottom: 6px; font-size: clamp(32px, 5vw, 50px); }
h2 { margin: 0 0 12px; color: var(--color-main-dark); font-size: 24px; line-height: 1.45; letter-spacing: 0; }
h3 { margin: 22px 0 8px; color: #34494b; font-size: 19px; line-height: 1.5; }
.lead { max-width: 760px; margin: 0; font-size: 18px; font-weight: 700; }
.home-hero-text { grid-column: 1; }
.home-hero .lead { max-width: 680px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 20px; }
.button { display: inline-block; margin-top: 10px; padding: 10px 16px; color: #fff; background: var(--color-main-dark); font-weight: 700; text-decoration: none; }
.button-secondary { color: var(--color-main-dark); background: #fff; border: 1px solid var(--color-main-dark); }
.hero-visual { grid-column: 2; align-self: end; margin: 0; padding-top: 18px; }
.hero-visual img { display: block; width: 100%; height: auto; border: 1px solid var(--color-border); border-radius: 8px; box-shadow: 0 14px 34px rgba(39,53,58,.1); }
section, .article-block { margin-top: 28px; }
.home-summary, .reading-flow, .decision-map, .check-axis, .cluster-links, .home-note, .cta-box, .intro-answer, .note-box { padding: 22px; background: #fff; border: 1px solid var(--color-border); border-radius: 8px; }
.home-summary h2, .reading-flow h2, .decision-map h2, .check-axis h2, .cluster-links h2, .home-note h2, .article-block h2, .faq h2, .related-links h2, .cta-box h2 { position: relative; padding: 0 0 12px 18px; border-bottom: 1px solid var(--color-border); }
.home-summary h2::before, .reading-flow h2::before, .decision-map h2::before, .check-axis h2::before, .cluster-links h2::before, .home-note h2::before, .article-block h2::before, .faq h2::before, .related-links h2::before, .cta-box h2::before { position: absolute; top: .28em; left: 0; width: 6px; height: 1.2em; background: var(--color-accent); border-radius: 999px; content: ""; }
.summary-columns, .category-grid, .article-list, .related-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
.summary-columns { grid-template-columns: repeat(3,minmax(0,1fr)); margin-top: 18px; }
.summary-columns div, .card, .article-card { display: block; padding: 16px; color: var(--color-text); background: #fbfffe; border: 1px solid var(--color-border); border-radius: 8px; text-decoration: none; }
.summary-columns strong, .card strong, .article-card strong { display: block; margin-bottom: 6px; color: var(--color-main-dark); font-size: 18px; }
.summary-columns span, .card span, .article-card span { display: block; color: var(--color-muted); font-size: 14px; }
.reading-flow ol { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; margin: 18px 0 0; padding: 0; list-style: none; counter-reset: flow; }
.reading-flow li { counter-increment: flow; }
.reading-flow a { position: relative; display: block; min-height: 100%; padding: 46px 16px 16px; color: var(--color-text); background: #fff; border: 1px solid var(--color-border); border-radius: 8px; text-decoration: none; }
.reading-flow a::before { position: absolute; top: 14px; left: 16px; display: grid; width: 26px; height: 26px; place-items: center; color: #fff; background: var(--color-main-dark); border-radius: 999px; content: counter(flow); font-size: 13px; font-weight: 800; }
.reading-flow strong, .reading-flow span { display: block; }
.reading-flow strong { color: var(--color-main-dark); font-size: 17px; }
.reading-flow span { margin-top: 6px; color: var(--color-muted); font-size: 14px; }
table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 15px; }
th, td { padding: 10px; border: 1px solid var(--color-border); text-align: left; vertical-align: top; }
th { color: #fff; background: var(--color-main-dark); }
.home-cta, .article-rich .cta-box { color: #fff; background: var(--color-main-dark); border-color: var(--color-main-dark); }
.home-cta h2, .home-cta p, .article-rich .cta-box h2, .article-rich .cta-box p { color: #fff; }
.home-cta .button, .article-rich .cta-box .button { color: var(--color-main-dark); background: #fff; border-radius: 999px; }
.breadcrumb { margin: 4px 0 18px; color: var(--color-muted); font-size: 14px; }
.meta { margin: 10px 0 0; color: var(--color-muted); font-size: 14px; }
.article-rich article, .article-rich .breadcrumb { max-width: 820px; margin-right: auto; margin-left: auto; }
.article-rich h1 { margin-bottom: 16px; padding-bottom: 18px; border-bottom: 3px solid var(--color-accent); font-size: clamp(32px,5vw,48px); }
.article-rich .lead { max-width: 780px; padding: 16px 18px; background: #fff; border: 1px solid var(--color-border); border-left: 6px solid var(--color-accent); font-size: 19px; }
.article-rich .meta { margin-top: 14px; padding-bottom: 18px; border-bottom: 1px solid var(--color-border); }
.intro-answer { margin-top: 30px; background: #fbfffe; border-left: 8px solid var(--color-main); box-shadow: 0 12px 30px rgba(23,106,107,.08); }
.toc { margin-top: 28px; padding: 20px 22px; background: var(--color-soft); border: 1px solid var(--color-border); border-radius: 8px; }
.toc ol { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px 20px; margin: 10px 0 0; padding-left: 22px; }
.checklist, .type-box, .note-box { margin-top: 20px; padding: 18px 20px; background: #fff; border: 1px solid var(--color-border); border-radius: 8px; box-shadow: 0 8px 22px rgba(39,53,58,.05); }
.type-box, .note-box { border-left: 6px solid var(--color-accent); }
.checklist ul { margin: 8px 0 0; padding-left: 22px; }
.faq { margin-top: 44px; padding: 22px; background: #f8fcfb; border: 1px solid var(--color-border); border-radius: 8px; }
.faq h3 { margin-top: 18px; padding: 16px 0 0; border-top: 1px solid var(--color-border); color: var(--color-main-dark); }
.site-footer { display: flex; flex-wrap: wrap; gap: 14px; border-top: 1px solid var(--color-border); font-size: 14px; }
@media (max-width:760px){.site-header{align-items:flex-start;flex-direction:column;margin-top:0;border-radius:0}main,.home-rich main,.article-rich main{padding:18px 14px 38px;border:0}.home-rich,.article-rich{background:#fff}.home-hero{grid-template-columns:1fr;padding:18px}.home-hero .label,.home-hero h1,.home-hero-text,.hero-visual{grid-column:1}.hero-visual{padding-top:4px}.hero-actions{flex-direction:column}.hero-actions .button{width:100%;text-align:center}.summary-columns,.category-grid,.article-list,.related-grid,.reading-flow ol,.toc ol{grid-template-columns:1fr}}

.article-hero-image {
  margin: 24px 0 28px;
}

.article-hero-image img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--color-border, #ddd);
  border-radius: 8px;
  object-fit: cover;
}