/* KUNI ブログ共通CSS — 2026-05-30
 * 設計原則:
 * - 本体LP (kuni/index.html) とトーン統一: KuniBlue + クリーム背景
 * - 長文の可読性優先: 行間 1.95, 段落間隔広め, 最大幅 720px
 * - AEO 配慮: H2/H3 を質問形にしやすい階層感, 概要テーブル目立つ, FAQ ハイライト
 */

:root {
  --color-primary: #1A56A7;
  --color-primary-dark: #0D3268;
  --color-primary-light: #4A86D7;
  --color-accent: #F0B36F;
  --color-accent-deep: #E0913C;
  --color-bg: #FAF7F0;
  --color-bg-soft: #E0EBF7;
  --color-surface: #FFFFFF;
  --color-ink: #1A1A2E;
  --color-mute: #5B6472;
  --color-line: #E4E9F2;
  --color-quote: #F3F6FB;

  --font-jp: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  --shadow-card: 0 4px 18px rgba(26, 86, 167, 0.08);
  --maxw-article: 720px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-jp);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.95;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--color-primary-dark); }

/* === Header bar === */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--color-primary); color: #fff;
  padding: 14px 24px;
}
.topbar__inner {
  max-width: var(--maxw-article);
  margin: 0 auto;
  display: flex; align-items: center; gap: 12px;
}
.topbar__brand {
  font-size: 18px; font-weight: 900; letter-spacing: 0.04em;
  color: #fff; text-decoration: none;
}
.topbar__sub { font-size: 12px; opacity: 0.85; }
.topbar__back {
  margin-left: auto; font-size: 13px; color: rgba(255,255,255,.9);
  text-decoration: none;
}
.topbar__back:hover { color: #fff; }

/* === Article shell === */
.article {
  max-width: var(--maxw-article);
  margin: 0 auto;
  padding: 32px 24px 64px;
}
.breadcrumb {
  font-size: 13px; color: var(--color-mute); margin: 0 0 20px;
}
.breadcrumb a { color: var(--color-mute); }
.breadcrumb__sep { margin: 0 6px; opacity: 0.6; }

.article__eyebrow {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 0.12em;
  color: var(--color-primary); background: var(--color-bg-soft);
  padding: 6px 14px; border-radius: var(--radius-pill);
  margin-bottom: 16px;
}

h1.article__title {
  font-size: clamp(26px, 4.8vw, 34px);
  font-weight: 900;
  line-height: 1.45;
  letter-spacing: 0.01em;
  margin: 0 0 16px;
  color: var(--color-ink);
}

.article__meta {
  display: flex; flex-wrap: wrap; gap: 14px;
  font-size: 13px; color: var(--color-mute);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  padding: 14px 0;
  margin: 8px 0 32px;
}
.article__meta strong { color: var(--color-ink); font-weight: 700; }

/* === Lead paragraph (AEO重要: 結論先出し) === */
.lede {
  font-size: 17px;
  line-height: 1.95;
  font-weight: 500;
  background: var(--color-quote);
  border-left: 4px solid var(--color-primary);
  padding: 20px 22px;
  margin: 0 0 36px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.lede strong { color: var(--color-primary-dark); }

/* === Overview table (AEO最強パーツ: 表でそのまま引用される) === */
.overview-table-wrap {
  overflow-x: auto;
  margin: 24px 0 40px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}
.overview-table {
  width: 100%; min-width: 560px;
  border-collapse: collapse;
  background: var(--color-surface);
  font-size: 14px;
}
.overview-table th, .overview-table td {
  border-bottom: 1px solid var(--color-line);
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
}
.overview-table thead th {
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.04em;
}
.overview-table tbody tr:last-child td { border-bottom: none; }
.overview-table tbody tr:hover { background: var(--color-bg-soft); }
.overview-table .badge {
  display: inline-block;
  font-size: 11px; font-weight: 700;
  background: var(--color-accent); color: var(--color-primary-dark);
  padding: 2px 8px; border-radius: var(--radius-pill);
}

/* === TOC === */
.toc {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  margin: 0 0 40px;
}
.toc__title {
  font-size: 13px; font-weight: 700; letter-spacing: 0.04em;
  color: var(--color-primary); margin: 0 0 12px;
}
.toc ol { margin: 0; padding-left: 22px; }
.toc ol li { margin-bottom: 6px; font-size: 15px; }
.toc ol li a { color: var(--color-ink); text-decoration: none; }
.toc ol li a:hover { color: var(--color-primary); text-decoration: underline; }

/* === Article sections (質問形H2 + 完結答え) === */
.article section { margin: 0 0 48px; }
h2 {
  font-size: clamp(20px, 3.4vw, 24px);
  font-weight: 900;
  line-height: 1.5;
  color: var(--color-ink);
  margin: 56px 0 18px;
  padding-top: 8px;
  border-top: 3px solid var(--color-primary);
  padding-top: 22px;
}
h3 {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--color-primary-dark);
  margin: 32px 0 12px;
}
h4 {
  font-size: 15px; font-weight: 700; color: var(--color-ink);
  margin: 24px 0 8px;
}

/* AEO: 各H2直下の最初の段落を強調 (結論先出し) */
.answer-first {
  font-size: 16.5px;
  font-weight: 500;
  background: #FFF8E7;
  border-left: 3px solid var(--color-accent-deep);
  padding: 14px 18px;
  margin: 0 0 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

p { margin: 0 0 18px; }
ol, ul { margin: 0 0 22px; padding-left: 28px; }
li { margin-bottom: 8px; }
strong { color: var(--color-primary-dark); font-weight: 700; }
em { font-style: normal; color: var(--color-accent-deep); font-weight: 700; }

/* Inline tip box: つまずきやすいポイント (E-E-A-T: Experience) */
.tip {
  background: #F4FAF4;
  border-left: 4px solid #2E7D32;
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 15px;
}
.tip__label {
  display: inline-block;
  font-size: 12px; font-weight: 700;
  background: #2E7D32; color: #fff;
  padding: 2px 10px; border-radius: var(--radius-pill);
  margin-bottom: 8px;
}

/* Warning box: 期限注意・罰則 */
.warning {
  background: #FFF0F0;
  border-left: 4px solid #C62828;
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 15px;
}
.warning__label {
  display: inline-block;
  font-size: 12px; font-weight: 700;
  background: #C62828; color: #fff;
  padding: 2px 10px; border-radius: var(--radius-pill);
  margin-bottom: 8px;
}

/* App CTA box (記事冒頭 + 末尾に配置) */
.cta-app {
  background: linear-gradient(135deg, var(--color-bg-soft), #F4F8FE);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  margin: 32px 0;
  text-align: center;
}
.cta-app__title {
  font-size: 17px; font-weight: 900;
  color: var(--color-primary-dark);
  margin: 0 0 8px;
}
.cta-app__desc { font-size: 14px; color: var(--color-mute); margin: 0 0 16px; }
.cta-app__btn {
  display: inline-block;
  background: var(--color-primary); color: #fff;
  padding: 12px 28px;
  border-radius: var(--radius-pill);
  font-weight: 700; font-size: 15px;
  text-decoration: none;
  transition: transform .25s cubic-bezier(.16,1,.3,1), box-shadow .25s;
}
.cta-app__btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(26,86,167,.28);
  color: #fff;
}

/* === FAQ section (FAQPage schema と対応) === */
.faq { margin: 56px 0; }
.faq__item {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  margin-bottom: 14px;
}
.faq__q {
  font-size: 16px; font-weight: 700; line-height: 1.6;
  color: var(--color-primary-dark);
  margin: 0 0 12px;
  display: flex; gap: 10px; align-items: flex-start;
}
.faq__q::before {
  content: "Q"; flex-shrink: 0;
  font-family: serif; font-size: 18px; font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
}
.faq__a {
  font-size: 15px; line-height: 1.9;
  color: var(--color-ink);
  display: flex; gap: 10px; align-items: flex-start;
}
.faq__a::before {
  content: "A"; flex-shrink: 0;
  font-family: serif; font-size: 18px; font-weight: 900;
  color: var(--color-accent-deep);
  line-height: 1;
}
.faq__a p:last-child { margin-bottom: 0; }

/* === Related articles === */
.related {
  background: var(--color-bg-soft);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  margin: 48px 0 24px;
}
.related__title {
  font-size: 13px; font-weight: 700; letter-spacing: 0.04em;
  color: var(--color-primary);
  margin: 0 0 16px;
}
.related__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}
.related__item {
  background: #fff;
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  text-decoration: none;
  color: var(--color-ink);
  font-size: 14.5px;
  font-weight: 500;
  transition: transform .2s cubic-bezier(.16,1,.3,1), box-shadow .2s;
  display: flex; justify-content: space-between; align-items: center; gap: 6px;
}
.related__item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  color: var(--color-primary-dark);
}
.related__arrow { color: var(--color-primary); font-weight: 700; }

/* === Footer (author + sources) === */
.article-footer {
  margin: 48px 0 0;
  padding: 28px 0;
  border-top: 1px solid var(--color-line);
  font-size: 13.5px;
  color: var(--color-mute);
}
.author-card {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin-bottom: 20px;
}
.author-card__avatar {
  flex-shrink: 0;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: grid; place-items: center;
  font-size: 22px; font-weight: 900;
}
.author-card__body { flex: 1; }
.author-card__name {
  font-size: 15px; font-weight: 700; color: var(--color-ink);
  margin: 0 0 4px;
}
.author-card__role {
  font-size: 12px; color: var(--color-mute);
  margin: 0 0 6px;
}
.author-card__bio {
  font-size: 13px; line-height: 1.7; color: var(--color-mute);
  margin: 0;
}

.sources {
  background: var(--color-quote);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-size: 13px;
}
.sources__label {
  font-weight: 700; color: var(--color-ink);
  margin-bottom: 8px;
}
.sources ul { padding-left: 20px; margin: 0; }
.sources li { margin-bottom: 4px; }
.sources a { color: var(--color-primary); }

/* === Site footer === */
.site-footer {
  background: var(--color-primary-dark); color: rgba(255,255,255,.86);
  padding: 36px 24px 28px;
  margin-top: 64px;
}
.site-footer__inner {
  max-width: var(--maxw-article);
  margin: 0 auto;
}
.site-footer__links {
  display: flex; flex-wrap: wrap; gap: 18px;
  font-size: 14px; margin-bottom: 16px;
}
.site-footer__links a { color: rgba(255,255,255,.86); text-decoration: none; }
.site-footer__links a:hover { color: #fff; }
.site-footer__bottom {
  padding-top: 14px;
  border-top: 1px solid rgba(255,255,255,.14);
  font-size: 12.5px;
  opacity: 0.8;
}

/* === Responsive === */
@media (max-width: 600px) {
  .article { padding: 24px 18px 48px; }
  h1.article__title { font-size: 24px; line-height: 1.4; }
  h2 { font-size: 19px; margin: 44px 0 14px; }
  h3 { font-size: 16.5px; }
  .lede { font-size: 16px; padding: 16px 18px; }
  .answer-first { font-size: 15.5px; padding: 12px 14px; }
  .overview-table { font-size: 13px; }
  .overview-table th, .overview-table td { padding: 10px 12px; }
  .related__grid { grid-template-columns: 1fr; }
}

/* === A11y === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}