/* 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:15px;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:15px;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:15px;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:14px;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:0}
.prose h3{font-size:21px;line-height:1.5;margin:2em 0 .6em;font-weight:700;scroll-margin-top:0;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:0}
.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:15px;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:15px}
.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:16px;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}

@media (max-width:640px){
  .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}}

:root{--color-navy:#182b50;--color-blue-600:#244eff;--color-blue-500:#244eff;--color-gray-600:#586982;--color-blue-border:#dce5f4;--color-blue-border-soft:#dce5f4;--color-blue-tint-100:#edf2ff;--surface-tint:#f3f6ff;--color-gray-100:#f5f7fb;--color-gray-300:#cbd5e1;--radius-md:8px;--radius-lg:10px;--radius-sm:5px;--radius-pill:4px;--shadow-card-sm:none;--color-cat-blue-bg:#edf2ff}
body{line-height:1.9;padding-bottom:0}.container{max-width:860px;padding:40px 32px 80px}.page-blog .container{max-width:1240px}.breadcrumb{font-size:14px;margin-bottom:32px;gap:8px;color:var(--muted)}.breadcrumb a{color:var(--muted);text-decoration:underline;text-underline-offset:3px}.page-title{font-size:44px;line-height:1.5;margin:0 0 16px;letter-spacing:-.03em}.page-lead{color:var(--muted);font-size:16px;line-height:2;margin-bottom:40px}.cards{grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.card{border:1px solid var(--line);border-radius:10px;box-shadow:none}.card-body{padding:26px;gap:14px}.card-title{font-size:20px;line-height:1.75;letter-spacing:-.02em}.card-title a{color:var(--ink)}.card-desc{font-size:15px;line-height:1.9;color:var(--muted)}.meta{color:var(--muted);font-size:14px}.chips{gap:6px}.chip{font-size:13px;line-height:1.6;background:var(--pale);color:var(--blue);border-radius:4px;padding:4px 8px}.article-header h1{font-size:36px;line-height:1.65;letter-spacing:-.03em;margin:14px 0 22px}.article-header{padding-bottom:24px;border-bottom:1px solid var(--line);margin-bottom:30px}.prose{font-size:16px;line-height:2.1;overflow-wrap:anywhere}.prose h2{font-size:26px;line-height:1.7;border-left:4px solid var(--blue);padding-left:18px;margin-top:54px}.prose h3{font-size:21px;line-height:1.8}.prose a,.toc a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}.prose table{font-size:15px;min-width:600px}.prose .table-wrap{overflow-x:auto}.toc{padding:24px;background:var(--pale);border:1px solid var(--line);border-radius:10px;font-size:15px;line-height:1.9}.toc li{margin:7px 0}.related .cards{grid-template-columns:repeat(2,minmax(0,1fr))}.related h2{font-size:26px;line-height:1.7}.cta-band{background:var(--navy);color:#fff;text-align:center;padding:64px 24px}.cta-title{font-size:28px;line-height:1.7;max-width:800px;margin:0 auto 16px}.cta-lead{font-size:16px;line-height:2;max-width:760px;margin:0 auto 26px;color:#d4def0;opacity:1}.cta-band .btn{background:var(--blue);color:#fff;white-space:normal;border:0;font-size:16px;padding:16px 24px}
@media(max-width:1000px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:620px){.container,.page-blog .container{padding:28px 20px 56px}.cards,.related .cards{grid-template-columns:minmax(0,1fr);gap:18px}.page-title{font-size:32px}.page-lead{font-size:15px;margin-bottom:30px}.breadcrumb{font-size:13px;margin-bottom:24px}.article-header h1{font-size:26px;line-height:1.7;letter-spacing:-.02em}.prose{font-size:16px;line-height:2.05}.prose h2{font-size:22px;line-height:1.7;padding-left:13px;margin-top:40px}.prose h3{font-size:19px}.toc{padding:20px 16px;font-size:15px}.card-body{padding:22px}.card-title{font-size:19px}.cta-band{padding:46px 20px}.cta-title{font-size:24px}.cta-lead{font-size:15px}}

.page-guide .cards{grid-template-columns:repeat(3,minmax(0,1fr))}@media(max-width:1000px){.page-guide .cards{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:620px){.page-guide .cards{grid-template-columns:minmax(0,1fr)}}