:root {
  color-scheme: light;
  --ink: #171429;
  --muted: #645f76;
  --brand: #6c4cff;
  --brand-dark: #4e32d9;
  --paper: #fffdf4;
  --line: #e8e2ff;
  --soft: #f4f0ff;
  --cyan-soft: #eaf8ff;
  --green-soft: #eaf8f0;
  --amber-soft: #fff4df;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-wrap: anywhere;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans JP", sans-serif;
  line-height: 1.75;
}

a, button, textarea { font: inherit; }
a:focus-visible, button:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 3px solid #23b8ff;
  outline-offset: 3px;
}

.seo-header {
  position: sticky;
  top: 0;
  z-index: 5;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 253, 244, .96);
  backdrop-filter: blur(10px);
}
.seo-header a {
  display: flex;
  align-items: baseline;
  gap: .45rem;
  max-width: 1040px;
  min-height: 48px;
  margin: auto;
  padding: .85rem 1rem;
  color: var(--ink);
  font-weight: 800;
  letter-spacing: .08em;
  text-decoration: none;
}
.seo-header small { color: var(--muted); font-weight: 600; letter-spacing: 0; }

.seo-shell { max-width: 920px; margin: auto; padding: 1rem clamp(1rem, 4vw, 2rem) 4rem; }
.breadcrumbs {
  display: flex;
  gap: .5rem;
  align-items: center;
  overflow: hidden;
  margin: .5rem 0 1.5rem;
  color: var(--muted);
  font-size: .86rem;
  white-space: nowrap;
}
.breadcrumbs a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding-block: .5rem;
  color: var(--brand-dark);
}
.breadcrumbs span:last-child { overflow: hidden; text-overflow: ellipsis; }

.seo-hero {
  padding: clamp(1.5rem, 5vw, 3rem);
  border: 1px solid var(--line);
  border-radius: 28px;
  background:
    radial-gradient(circle at 90% 10%, rgba(35, 184, 255, .13), transparent 34%),
    linear-gradient(135deg, #fff 0%, var(--soft) 100%);
}
.eyebrow { margin: 0; color: var(--brand-dark); font-size: .78rem; font-weight: 800; letter-spacing: .12em; }
.seo-hero h1 { margin: .45rem 0 1rem; font-size: clamp(1.9rem, 5vw, 3.25rem); line-height: 1.28; letter-spacing: -.025em; }
.lead { font-size: clamp(1.02rem, 2.5vw, 1.2rem); }
.updated { margin-bottom: 0; color: var(--muted); font-size: .82rem; }

.article-toc {
  margin-top: 1.25rem;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}
.article-toc > strong { display: block; margin-bottom: .6rem; font-size: .88rem; }
.article-toc > div { display: flex; flex-wrap: wrap; gap: .5rem; }
.article-toc a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: .55rem .85rem;
  border-radius: 999px;
  background: var(--soft);
  color: var(--brand-dark);
  font-size: .82rem;
  font-weight: 700;
  text-decoration: none;
}
.article-toc a:hover { background: #e9e2ff; }

article > section, article > aside, article > nav { margin-top: 2.7rem; scroll-margin-top: 5rem; }
h2 { font-size: clamp(1.3rem, 3vw, 1.65rem); line-height: 1.4; }
ul { padding-left: 1.4rem; }
li + li { margin-top: .5rem; }

.answer, .mid-cta { padding: 1.35rem clamp(1rem, 4vw, 2rem); border-radius: 20px; background: var(--soft); }
.answer { border-left: 5px solid var(--brand); }
.answer h2, .answer p { margin-top: 0; }
.answer p { margin-bottom: 0; font-size: 1.04rem; }

.guide-visual {
  margin: 0;
  padding: clamp(1rem, 3vw, 1.5rem);
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(145deg, #fff, #faf8ff);
}
.guide-visual figcaption { display: grid; gap: .25rem; margin-bottom: 1rem; }
.guide-visual figcaption strong { font-size: 1.05rem; }
.guide-visual figcaption span { color: var(--muted); font-size: .86rem; }
.guide-flow {
  counter-reset: flow;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .8rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.guide-flow li {
  counter-increment: flow;
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: .65rem;
  min-width: 0;
  margin: 0;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}
.flow-number {
  display: grid;
  width: 2.15rem;
  height: 2.15rem;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(135deg, #ff4f9a, var(--brand), #23b8ff);
  color: #fff;
  font-size: .86rem;
  font-weight: 900;
}
.flow-number::before { content: counter(flow); }
.guide-flow strong { display: block; line-height: 1.45; }
.guide-flow p { margin: .35rem 0 0; color: var(--muted); font-size: .84rem; line-height: 1.65; }

.search-concept {
  display: grid;
  gap: .8rem;
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 16px;
  background: #1d1734;
  color: #fff;
}
.concept-query { display: grid; gap: .25rem; padding: .85rem 1rem; border-radius: 12px; background: #fff; color: var(--ink); }
.concept-query small { color: var(--muted); }
.concept-query strong { font-size: .92rem; }
.concept-route { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: .55rem; font-size: .82rem; font-weight: 750; text-align: center; }
.concept-route span { padding: .45rem .65rem; border: 1px solid #ffffff40; border-radius: 999px; }
.concept-route i { color: #82ddff; font-size: 1.1rem; font-style: normal; }

.audience-list { display: grid; gap: .65rem; padding: 0; list-style: none; }
.audience-list li { position: relative; margin: 0; padding: .85rem 1rem .85rem 2.7rem; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.audience-list li::before { content: "✓"; position: absolute; left: 1rem; color: var(--brand); font-weight: 900; }

.criteria-grid { counter-reset: criteria; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .8rem; }
.criteria-grid div { counter-increment: criteria; min-width: 0; padding: 1rem; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.criteria-grid dt { font-weight: 800; }
.criteria-grid dt::before { content: counter(criteria) ". "; color: var(--brand); }
.criteria-grid dd { margin: .35rem 0 0; color: var(--muted); font-size: .9rem; }
.check-list { display: grid; gap: .6rem; margin-top: 1rem; padding: 0; list-style: none; }
.check-list li { position: relative; margin: 0; padding-left: 2rem; }
.check-list li::before { content: "□"; position: absolute; left: .2rem; color: var(--brand-dark); font-size: 1.15rem; font-weight: 900; }

.seo-table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 16px; background: #fff; }
table { width: 100%; min-width: 620px; border-collapse: collapse; }
th, td { padding: .9rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: var(--soft); font-size: .88rem; }
tr:last-child td { border-bottom: 0; }

.mid-cta { border: 1px solid #d8ceff; background: linear-gradient(135deg, var(--soft), var(--cyan-soft)); }
.mid-cta h2 { margin-top: 0; }
.mid-cta form { display: grid; gap: .65rem; }
.mid-cta label { font-weight: 800; }
.mid-cta textarea {
  width: 100%;
  min-height: 96px;
  padding: .85rem;
  resize: vertical;
  border: 1px solid #bdb1ef;
  border-radius: 12px;
  background: #fff;
}
/* 2026-09-04: 検索CTAが記事後半にしかなく利用0件だったため、結論直後にも置く。
   ボタンの見た目は既存CTAと揃える。 */
.top-cta { display: grid; gap: .5rem; justify-items: start; margin: 1rem 0 0; }
.top-cta small { color: var(--muted); font-size: .8rem; }
.mid-cta button, .bottom-cta a, .top-cta a {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: .75rem 1.2rem;
  border: 0;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}
.mid-cta button:hover, .bottom-cta a:hover, .top-cta a:hover { background: var(--brand-dark); }

/* 2026-09-05: 結論直後・中盤・末尾の3箇所にCTAを置いても検索導線クリックが
   実数0件のままだったため、スクロール位置に関係なく常に見える固定フッター
   CTAを追加する。閲覧の妨げにならないよう、記事下部に十分な余白を確保する。 */
body:has(.sticky-cta) .seo-shell { padding-bottom: 6.5rem; }
.sticky-cta {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 6;
  display: flex;
  justify-content: center;
  padding: .6rem clamp(1rem, 4vw, 2rem) calc(.6rem + env(safe-area-inset-bottom, 0px));
  background: rgba(255, 253, 244, .96);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.sticky-cta a {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: min(100%, 480px);
  min-height: 48px;
  padding: .75rem 1.2rem;
  border-radius: 999px;
  background: var(--brand);
  color: #fff;
  font-weight: 800;
  text-decoration: none;
}
.sticky-cta a:hover { background: var(--brand-dark); }

.evidence-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; padding: 0; list-style: none; }
.evidence-grid li { margin: 0; padding: 1rem; border: 1px solid var(--line); border-radius: 14px; background: var(--green-soft); font-size: .9rem; }
.evidence-grid li::before { content: "確認"; display: block; width: fit-content; margin-bottom: .4rem; padding: .1rem .45rem; border-radius: 999px; background: #16794b; color: #fff; font-size: .68rem; font-weight: 800; }
html:lang(en) .evidence-grid li::before { content: "CHECK"; }

.review-check-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .65rem; padding: 0; list-style: none; }
.review-check-grid li { display: grid; gap: .3rem; min-width: 0; margin: 0; padding: .9rem; border-radius: 14px; background: var(--amber-soft); }
.review-check-grid strong { color: #8b4b00; }
.review-check-grid span { color: var(--muted); font-size: .82rem; line-height: 1.55; }

.identity-guide { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .7rem; }
.identity-guide > div { display: grid; gap: .3rem; min-width: 0; padding: 1rem; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
.identity-guide > div::before { display: inline-grid; width: 1.7rem; height: 1.7rem; place-items: center; border-radius: 50%; color: #fff; font-weight: 900; }
.identity-guide [data-state="match"]::before { content: "="; background: #16794b; }
.identity-guide [data-state="similar"]::before { content: "≈"; background: #b26400; }
.identity-guide [data-state="unknown"]::before { content: "?"; background: #665f76; }
.identity-guide span { color: var(--muted); font-size: .84rem; line-height: 1.55; }

details { padding: 1rem 0; border-bottom: 1px solid var(--line); }
summary { min-height: 44px; font-weight: 800; cursor: pointer; }
.source-note { padding: 1rem; border-radius: 14px; background: #f6f5f0; color: var(--muted); font-size: .9rem; }
.source-note h2 { color: var(--ink); }
.related-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .7rem; padding: 0; list-style: none; }
.related-grid li { margin: 0; }
.related-grid a { display: flex; min-height: 64px; align-items: center; padding: .85rem 1rem; border: 1px solid var(--line); border-radius: 14px; background: #fff; color: var(--brand-dark); font-weight: 700; text-decoration: none; }
.related-grid a:hover { border-color: var(--brand); background: var(--soft); }
.all-guides-link a { border-color: var(--brand); background: var(--soft); }
.guide-hub-section > header { margin-bottom: 1rem; }
.guide-hub-section > header h2 { margin-bottom: .4rem; }
.guide-hub-section > header p { margin: 0; color: var(--muted); }
.guide-hub-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .8rem;
  width: 100%;
  min-width: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}
.guide-hub-grid li { min-width: 0; margin: 0; }
.guide-hub-grid a {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  min-width: 0;
  min-height: 108px;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  color: var(--ink);
  text-decoration: none;
  overflow-wrap: anywhere;
}
.guide-hub-grid a:hover { border-color: var(--brand); background: var(--soft); }
.guide-hub-grid strong { color: var(--brand-dark); line-height: 1.45; }
.guide-hub-grid span { color: var(--muted); font-size: .86rem; line-height: 1.6; }
.bottom-cta { margin-top: 2.5rem; text-align: center; }
.bottom-cta a { width: min(100%, 420px); }
footer { display: flex; justify-content: center; gap: 1.5rem; padding: 2rem; border-top: 1px solid var(--line); font-size: .88rem; }
footer a { min-height: 44px; color: var(--muted); }

@media (max-width: 700px) {
  .seo-header { position: static; }
  .seo-shell { padding-inline: 1rem; }
  .seo-hero { border-radius: 20px; }
  article > section, article > aside, article > nav { margin-top: 2.2rem; scroll-margin-top: 1rem; }
  .guide-flow, .criteria-grid, .evidence-grid, .identity-guide, .related-grid, .guide-hub-grid { grid-template-columns: 1fr; }
  .review-check-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .concept-route { align-items: stretch; flex-direction: column; }
  .concept-route i { transform: rotate(90deg); }
  .seo-table-wrap { overflow: visible; border: 0; background: transparent; }
  table, tbody, tr, td { display: block; width: 100%; min-width: 0; }
  thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  tbody { display: grid; gap: .8rem; }
  tr { overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #fff; }
  td { display: grid; grid-template-columns: minmax(7.5rem, .42fr) minmax(0, 1fr); gap: .7rem; border-bottom: 1px solid var(--line); }
  td::before { content: attr(data-label); color: var(--brand-dark); font-size: .78rem; font-weight: 800; }
  tr:last-child td:not(:last-child) { border-bottom: 1px solid var(--line); }
  td:last-child { border-bottom: 0; }
}

@media (max-width: 430px) {
  .review-check-grid { grid-template-columns: 1fr; }
  td { grid-template-columns: 1fr; gap: .2rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}