/* ブログ（一覧・記事）用のスタイル。色・フォントは colors.css / typography.css / spacing.css の変数を使う */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:#fff;color:var(--color-navy);font-family:var(--font-body);font-size:16px;line-height:1.9;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
a{color:var(--color-blue-600)}
a:hover{opacity:.8}
:focus-visible{outline:3px solid var(--color-blue-500);outline-offset:2px;border-radius:4px}

/* ヘッダー */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(4px);border-bottom:1px solid var(--color-blue-border)}
.site-header-inner{max-width:1120px;margin:0 auto;padding:10px 24px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--color-navy);min-width:0}
.brand img{display:block;height:34px;width:auto}
.brand-sub{font-weight:700;font-size:18px;white-space:nowrap}
.site-nav{display:flex;align-items:center;gap:18px}
.nav-link{color:var(--color-navy);font-weight:700;text-decoration:none;font-size:15px}
.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:var(--radius-md);padding:10px 20px;font-weight:700;font-size:14px;line-height:1.4;text-decoration:none;border:2px solid transparent;white-space:nowrap}
.btn-primary{background:var(--color-yellow-500);color:var(--color-navy)}
.btn-lg{padding:16px 36px;font-size:18px}

/* レイアウト */
.container{max-width:760px;margin:0 auto;padding:32px 24px 56px}
.page-blog .container{max-width:1000px}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;margin:0 0 20px;color:var(--color-gray-600);line-height:1.6}
.breadcrumb a{color:var(--color-gray-600)}
.page-title{font-size:clamp(28px,4vw,40px);line-height:1.3;margin:8px 0 8px;font-weight:900}
.page-lead{margin:0 0 32px;color:var(--color-gray-600)}
.empty{padding:48px 0;text-align:center;color:var(--color-gray-600)}

/* 一覧カード */
.cards{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}
.card{background:#fff;border:1px solid var(--color-blue-border);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-card-sm);display:flex;flex-direction:column}
.card-thumb{display:block;aspect-ratio:1200/630;overflow:hidden;background:var(--surface-blue-wash)}
.card-thumb img{width:100%;height:100%;object-fit:cover;display:block}
.card-body{padding:20px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-title{font-size:18px;line-height:1.5;margin:0;font-weight:700}
.card-title a{color:var(--color-navy);text-decoration:none}
.card-title a:hover{color:var(--color-blue-600);opacity:1}
.card-desc{margin:0;font-size:14px;line-height:1.8;color:var(--color-gray-600);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.meta{margin:0;font-size:13px;color:var(--color-gray-600);font-family:var(--font-body)}
.meta-sep{margin:0 4px}
.chips{list-style:none;margin:4px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.chip{font-size:12px;line-height:1.4;padding:3px 10px;border-radius:var(--radius-pill);background:var(--color-blue-tint-100);color:var(--color-blue-600);font-weight:700}
.chip-cat{background:var(--color-cat-blue-bg)}

/* 記事 */
.article-header h1{font-size:clamp(26px,4vw,36px);line-height:1.45;margin:8px 0 12px;font-weight:900}
.cover{margin:24px 0}
.cover img{display:block;width:100%;height:auto;border-radius:var(--radius-lg)}
.toc{background:var(--surface-tint);border:1px solid var(--color-blue-border);border-radius:var(--radius-md);padding:16px 24px;margin:24px 0}
.toc-title{margin:0 0 4px;font-weight:700}
.toc ol{margin:0;padding-left:1.4em}
.toc li{margin:2px 0;line-height:1.7}
.prose{font-size:17px;line-height:2}
.prose h2{font-size:26px;line-height:1.5;margin:2.4em 0 .8em;padding:.2em 0 .2em .7em;border-left:6px solid var(--color-blue-600);font-weight:900;scroll-margin-top:80px}
.prose h3{font-size:21px;line-height:1.5;margin:2em 0 .6em;font-weight:700;scroll-margin-top:80px;padding-bottom:.2em;border-bottom:2px solid var(--color-blue-border)}
.prose h4{font-size:18px;margin:1.6em 0 .5em;font-weight:700;scroll-margin-top:80px}
.prose p{margin:0 0 1.3em}
.prose ul,.prose ol{margin:0 0 1.3em;padding-left:1.6em}
.prose li{margin:.3em 0}
.prose ul.todo{list-style:none;padding-left:.4em}
.todo-mark{margin-right:.3em}
.prose blockquote{margin:0 0 1.3em;padding:.6em 1.2em;border-left:4px solid var(--color-gray-300);color:var(--color-gray-600);background:var(--color-gray-100);border-radius:0 var(--radius-sm) var(--radius-sm) 0}
.prose blockquote p:last-child{margin-bottom:0}
.prose hr{border:0;border-top:1px solid var(--color-blue-border);margin:2.4em 0}
.prose p>img{display:block;margin:1.6em auto;border-radius:var(--radius-md)}
.prose figure{margin:1.6em 0}
.prose figure img{display:block;margin:0 auto;border-radius:var(--radius-md)}
.prose figcaption{margin-top:.6em;font-size:13px;color:var(--color-gray-600);text-align:center;line-height:1.7}
.prose code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.88em;background:var(--color-gray-100);padding:.1em .4em;border-radius:4px}
.prose pre{background:#0f172a;color:#e2e8f0;padding:16px 20px;border-radius:var(--radius-md);overflow-x:auto;line-height:1.7;margin:0 0 1.3em}
.prose pre code{background:none;padding:0;color:inherit;font-size:14px}
.prose .callout{display:flex;gap:12px;padding:16px 20px;margin:0 0 1.3em;background:var(--color-blue-tint-100);border:1px solid var(--color-blue-border-soft);border-radius:var(--radius-md)}
.prose .callout p:last-child{margin-bottom:0}
.callout-icon{font-size:22px;line-height:1.6}
.prose details{margin:0 0 1.3em;border:1px solid var(--color-blue-border);border-radius:var(--radius-md);padding:10px 18px}
.prose summary{cursor:pointer;font-weight:700}
.prose .table-wrap{overflow-x:auto;margin:0 0 1.3em}
.prose table{border-collapse:collapse;min-width:100%;font-size:15px;line-height:1.7}
.prose th,.prose td{border:1px solid var(--color-blue-border-soft);padding:8px 12px;text-align:left;vertical-align:top}
.prose th{background:var(--color-blue-tint-100);font-weight:700}
.prose .columns{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px}
.prose .link-card a{display:block;padding:12px 16px;border:1px solid var(--color-blue-border);border-radius:var(--radius-md);word-break:break-all}
.prose a{word-break:break-word}
.prose .indent{margin-left:1.2em}

/* 関連記事・CTA */
.related{margin-top:56px}
.related h2{font-size:22px;margin:0 0 16px;font-weight:900}
.cta-band{background:var(--color-blue-500);color:#fff;text-align:center;padding:56px 24px}
.cta-title{margin:0 0 8px;font-size:clamp(20px,3vw,26px);font-weight:900;line-height:1.5}
.cta-lead{margin:0 0 24px;opacity:.92}

/* フッター */
.site-footer{padding:56px 24px;display:flex;flex-direction:column;align-items:center;gap:24px;background:#fff}
.site-footer img{height:30px;width:auto}
.footer-nav{display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:center}
.footer-nav a{color:var(--color-navy);font-size:14px}
.copyright{margin:0;font-size:11px;color:var(--color-blue-700);font-family:var(--font-display-num)}

@media (max-width:640px){
  .site-header-inner{padding:8px 16px}
  .brand img{height:28px}
  .brand-sub{display:none}
  .nav-link{display:none}
  .btn{padding:9px 14px;font-size:13px}
  .container{padding:24px 16px 48px}
  .prose{font-size:16px}
  .prose h2{font-size:22px}
  .prose h3{font-size:19px}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}