:root {
  --color-main: #158b8f;
  --color-main-dark: #075f63;
  --color-accent: #f27b68;
  --color-accent-soft: #ffe6e1;
  --color-bg: #eefafa;
  --color-surface: #ffffff;
  --color-soft: #e4f6f6;
  --color-border: #cbe6e5;
  --color-text: #27323a;
  --color-muted: #607074;
}

* {
  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%, 1080px);
  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%, 1080px);
  margin: 0 auto;
  padding: 28px clamp(18px, 4vw, 44px) 54px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.home-rich {
  background: linear-gradient(180deg, #dff6f6 0, #eefafa 340px, #ffffff 340px);
}

.page-rich {
  background: linear-gradient(180deg, #dff6f6 0, #eefafa 260px, #ffffff 260px);
}

.home-rich .site-header,
.page-rich .site-header {
  margin-top: 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px 8px 0 0;
}

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
  gap: 18px 30px;
  align-items: start;
  padding: 28px;
  background: #fbffff;
  border: 1px solid var(--color-border);
  border-left: 8px solid var(--color-main);
  border-radius: 8px;
  box-shadow: 0 12px 30px rgba(7, 95, 99, .08);
}

.label {
  display: inline-block;
  margin: 0 0 10px;
  padding: 3px 10px;
  color: var(--color-main-dark);
  background: #ffffff;
  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(30px, 5vw, 48px);
  line-height: 1.35;
  letter-spacing: 0;
}

.home-hero h1 {
  grid-column: 1 / -1;
  max-width: 980px;
  margin-bottom: 6px;
  font-size: clamp(34px, 5vw, 52px);
}

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: #31494b;
  font-size: 19px;
  line-height: 1.5;
}

.lead {
  max-width: 780px;
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.home-hero-text {
  grid-column: 1;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.button {
  display: inline-block;
  margin-top: 10px;
  padding: 10px 16px;
  color: #ffffff;
  background: var(--color-main-dark);
  font-weight: 700;
  text-decoration: none;
}

.button-secondary {
  color: var(--color-main-dark);
  background: #ffffff;
  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, 50, 58, .1);
}

section,
.article-block {
  margin-top: 28px;
}

.panel,
.home-summary,
.reading-flow,
.decision-map,
.check-axis,
.cluster-links,
.home-note,
.cta-box,
.intro-answer,
.diagnosis-box,
.result-box {
  padding: 22px;
  background: #ffffff;
  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,
.diagnosis-box h2,
.result-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,
.diagnosis-box h2::before,
.result-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,
.type-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,
.type-card,
.choice-card {
  display: block;
  padding: 16px;
  color: var(--color-text);
  background: #fbffff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-decoration: none;
}

.summary-columns strong,
.card strong,
.article-card strong,
.type-card strong {
  display: block;
  margin-bottom: 6px;
  color: var(--color-main-dark);
  font-size: 18px;
}

.summary-columns span,
.card span,
.article-card span,
.type-card span {
  display: block;
  color: var(--color-muted);
  font-size: 14px;
}

.step-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.step-list li {
  counter-increment: step;
  padding: 10px;
  background: var(--color-soft);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 700;
}

.step-list li::before {
  content: counter(step) ". ";
  color: var(--color-accent);
}

.question {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.choice-card {
  width: 100%;
  margin: 0;
  text-align: left;
  cursor: pointer;
  font: inherit;
}

.choice-card:hover,
.choice-card.is-selected {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.result-box {
  display: none;
  border-left: 8px solid var(--color-accent);
}

.result-box.is-visible {
  display: block;
}

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: #ffffff;
  background: var(--color-main-dark);
}

.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: #ffffff;
  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: #ffffff;
  background: var(--color-main-dark);
  border-radius: 999px;
  content: counter(flow);
  font-size: 13px;
  font-weight: 800;
}

.home-cta,
.page-rich .cta-box {
  color: #ffffff;
  background: var(--color-main-dark);
  border-color: var(--color-main-dark);
}

.home-cta h2,
.home-cta p,
.page-rich .cta-box h2,
.page-rich .cta-box p {
  color: #ffffff;
}

.home-cta .button,
.page-rich .cta-box .button {
  color: var(--color-main-dark);
  background: #ffffff;
  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;
}

.page-rich article,
.page-rich .breadcrumb {
  max-width: 840px;
  margin-right: auto;
  margin-left: auto;
}

.page-rich h1 {
  margin-bottom: 16px;
  padding-bottom: 18px;
  border-bottom: 3px solid var(--color-accent);
}

.page-rich .lead {
  padding: 16px 18px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-left: 6px solid var(--color-accent);
}

.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,
.note-box {
  margin-top: 20px;
  padding: 18px 20px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  border-left: 6px solid var(--color-accent);
  border-radius: 8px;
}

.faq {
  margin-top: 44px;
  padding: 22px;
  background: #fbffff;
  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 {
    padding: 18px 14px 38px;
    border: 0;
  }

  .home-rich,
  .page-rich {
    background: #ffffff;
  }

  .home-hero,
  .choice-grid,
  .step-list {
    grid-template-columns: 1fr;
  }

  .home-hero {
    padding: 18px;
  }

  .home-hero .label,
  .home-hero h1,
  .home-hero-text,
  .hero-visual {
    grid-column: 1;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .button {
    width: 100%;
    text-align: center;
  }

  .summary-columns,
  .category-grid,
  .article-list,
  .related-grid,
  .type-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;
}