*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --font:system-ui,-apple-system,"Hiragino Kaku Gothic ProN","Hiragino Sans",Meiryo,sans-serif;
  --c-bg:#fff;
  --c-surface:#f8f9fa;
  --c-text:#1e293b;
  --c-sub:#64748b;
  --c-faint:#94a3b8;
  --c-border:#e2e8f0;
  --c-accent:#2563eb;
  --c-accent-bg:#eff6ff;
  --max-w:680px;
}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:var(--font);color:var(--c-text);background:var(--c-bg);line-height:1.9;word-break:break-word;-webkit-font-smoothing:antialiased}

/* ── Site header ── */
.site-header{background:linear-gradient(135deg,#1e40af,#1d4ed8);padding:16px 0}
.site-header-inner{max-width:var(--max-w);margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between}
.site-logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:#fff}
.site-logo-mark{display:flex;align-items:center;justify-content:center;width:36px;height:36px;background:rgba(255,255,255,.18);border-radius:10px;font-size:18px;font-weight:700}
.site-logo-text{font-size:14px;font-weight:700;letter-spacing:.02em}
.site-logo-sub{font-size:11px;opacity:.7;margin-top:1px}
.site-nav a{color:rgba(255,255,255,.85);text-decoration:none;font-size:13px;padding:6px 14px;border-radius:8px;transition:background .15s}
.site-nav a:hover{background:rgba(255,255,255,.12)}

/* ── Article ── */
.article-wrap{max-width:var(--max-w);margin:0 auto;padding:40px 20px 80px}
.article-date{font-size:13px;color:var(--c-faint);margin-bottom:8px}
.article-title{font-size:24px;font-weight:700;line-height:1.5;margin-bottom:12px;letter-spacing:-.01em}
.article-lead{font-size:15px;color:var(--c-sub);line-height:1.8;margin-bottom:40px;padding-bottom:32px;border-bottom:1px solid var(--c-border)}

h2{font-size:19px;font-weight:700;margin:48px 0 16px;padding-bottom:8px;border-bottom:2px solid var(--c-accent);line-height:1.5}
h3{font-size:16px;font-weight:700;margin:32px 0 12px;padding-left:12px;border-left:3px solid var(--c-accent);line-height:1.5}
p{margin:0 0 20px;font-size:15px}
ul,ol{margin:0 0 20px;padding-left:1.5em;font-size:15px}
li{margin-bottom:6px;line-height:1.8}

/* ── Comparison table ── */
.compare-table{width:100%;border-collapse:collapse;margin:0 0 28px;font-size:14px}
.compare-table th{background:var(--c-surface);font-weight:600;text-align:left;padding:10px 12px;border-bottom:2px solid var(--c-border);font-size:13px;white-space:nowrap}
.compare-table td{padding:10px 12px;border-bottom:1px solid var(--c-border);vertical-align:top;line-height:1.7}
.compare-table tr:last-child td{border-bottom:none}

/* ── CTA box ── */
.cta-box{background:var(--c-accent-bg);border:1px solid #bfdbfe;border-radius:12px;padding:24px 28px;margin:32px 0}
.cta-box p{margin-bottom:12px;font-size:14px;color:var(--c-text)}
.cta-box .cta-title{font-size:16px;font-weight:700;margin-bottom:8px;color:var(--c-accent)}
.cta-links{display:flex;flex-direction:column;gap:8px}
.cta-link{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;background:var(--c-accent);color:#fff;text-decoration:none;border-radius:8px;font-size:14px;font-weight:600;transition:opacity .15s;text-align:center;justify-content:center}
.cta-link:hover{opacity:.85}
.cta-link-sub{background:#fff;color:var(--c-accent);border:1px solid var(--c-accent)}

/* ── Insight box (bridge section) ── */
.insight-box{background:#fffbeb;border:1px solid #fde68a;border-radius:12px;padding:24px 28px;margin:32px 0}
.insight-box .insight-icon{font-size:20px;margin-bottom:8px}
.insight-box p{font-size:14px;color:#92400e;margin-bottom:8px}
.insight-box p:last-child{margin-bottom:0}

/* ── Checklist ── */
.checklist{list-style:none;padding-left:0;margin:0 0 28px}
.checklist li{padding:10px 14px;border:1px solid var(--c-border);border-radius:8px;margin-bottom:6px;font-size:14px;display:flex;align-items:center;gap:10px;background:#fff}
.checklist li::before{content:"☐";font-size:18px;color:var(--c-faint);flex-shrink:0}

/* ── Tool promo (inline) ── */
.tool-promo{background:var(--c-surface);border-radius:12px;padding:20px 24px;margin:28px 0;display:flex;gap:16px;align-items:center;text-decoration:none;color:var(--c-text);border:1px solid var(--c-border);transition:border-color .15s}
.tool-promo:hover{border-color:var(--c-accent)}
.tool-promo-icon{font-size:32px;flex-shrink:0}
.tool-promo-body{font-size:13px;line-height:1.7}
.tool-promo-title{font-weight:700;font-size:14px;color:var(--c-accent);margin-bottom:2px}

/* ── Blog list ── */
.blog-list{list-style:none;padding:0}
.blog-card{display:block;text-decoration:none;color:var(--c-text);padding:24px 0;border-bottom:1px solid var(--c-border);transition:opacity .15s}
.blog-card:first-child{padding-top:0}
.blog-card:hover{opacity:.75}
.blog-card-date{font-size:12px;color:var(--c-faint);margin-bottom:4px}
.blog-card-title{font-size:17px;font-weight:700;line-height:1.5;margin-bottom:6px}
.blog-card-desc{font-size:14px;color:var(--c-sub);line-height:1.7}

/* ── Footer ── */
.site-footer{background:var(--c-surface);border-top:1px solid var(--c-border);padding:32px 20px;text-align:center;font-size:12px;color:var(--c-faint);line-height:1.8}
.site-footer a{color:var(--c-sub);text-decoration:none}
.site-footer a:hover{text-decoration:underline}

/* ── Bare h1 inside articles (fallback) ── */
.article-wrap h1{font-size:24px;font-weight:700;line-height:1.5;margin-bottom:12px;letter-spacing:-.01em}

/* ── Bare tables inside articles (fallback) ── */
.article-wrap table{width:100%;border-collapse:collapse;margin:0 0 28px;font-size:14px}
.article-wrap table th{background:var(--c-surface);font-weight:600;text-align:left;padding:10px 12px;border-bottom:2px solid var(--c-border);font-size:13px}
.article-wrap table td{padding:10px 12px;border-bottom:1px solid var(--c-border);vertical-align:top;line-height:1.7}
.article-wrap table tr:last-child td{border-bottom:none}

/* ── Summary box (先に結論) ── */
.box-summary{background:#f0fdf4;border:1px solid #86efac;border-radius:12px;padding:24px 28px;margin:32px 0}
.box-summary p{font-size:14px;margin-bottom:12px}
.box-summary .box-summary-title{font-size:16px;font-weight:700;color:#059669;margin-bottom:8px}
.box-summary ul,.box-summary ol{margin:0;padding-left:1.2em;font-size:14px;line-height:2}
.box-summary li{margin-bottom:0}

/* ── Tip box ── */
.box-tip{background:#fffbeb;border:1px solid #fde68a;border-radius:12px;padding:24px 28px;margin:32px 0}
.box-tip p{font-size:14px;color:#92400e;margin-bottom:8px}
.box-tip p:last-child{margin-bottom:0}
.box-tip ul,.box-tip ol{margin:8px 0 0;font-size:14px;color:#92400e}

/* ── Related articles ── */
.related-articles{background:var(--c-surface);border-radius:12px;padding:20px 24px;margin:28px 0}
.related-articles p{margin:0 0 12px;font-size:14px;font-weight:700;color:var(--c-text)}
.related-articles ul{margin:0;padding-left:0;list-style:none;font-size:14px;line-height:2.2}
.related-articles li{margin-bottom:0}
.related-articles a{color:var(--c-accent)}

/* ── Affiliate links ── */
.affiliate-links{background:var(--c-accent-bg);border:1px solid #bfdbfe;border-radius:12px;padding:24px 28px;margin:32px 0}
.affiliate-links p{font-size:14px;margin-bottom:12px}
.affiliate-links>a{display:inline-flex;align-items:center;justify-content:center;gap:6px;width:100%;padding:12px 20px;background:var(--c-accent);color:#fff;text-decoration:none;border-radius:8px;font-size:14px;font-weight:600;text-align:center;transition:opacity .15s}
.affiliate-links>a:hover{opacity:.85}
.affiliate-links img{max-width:100%;height:auto}
.affiliate-links p a{display:inline;padding:0;background:none;color:var(--c-accent);width:auto}

/* ── Inline app CTA link ── */
.cta-app{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:12px 24px;background:var(--c-accent);color:#fff;text-decoration:none;border-radius:8px;font-size:14px;transition:opacity .15s}
.cta-app:hover{opacity:.85}
.cta-app strong{font-weight:600}

/* ── Responsive ── */
@media(max-width:600px){
  .article-title,.article-wrap h1{font-size:20px}
  h2{font-size:17px}
  .cta-box,.insight-box,.box-summary,.box-tip,.affiliate-links{padding:20px}
  .tool-promo{flex-direction:column;text-align:center}
  .article-wrap table{font-size:13px}
  .article-wrap table th,.article-wrap table td{padding:8px 10px}
}