:root{
  --bg:#f8faf7;
  --surface:#fff;
  --text:#18251c;
  --sub:#526258;
  --muted:#718078;
  --line:#dce5dd;
  --brand:#208f50;
  --brand-dark:#176c3d;
  --brand-soft:#edf7f0;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:"Noto Sans JP",system-ui,sans-serif;line-height:1.85;-webkit-font-smoothing:antialiased}
a{color:inherit}
img{max-width:100%;height:auto}
.site-header{position:sticky;top:0;z-index:10;background:rgba(248,250,247,.94);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.header-inner{max-width:920px;height:62px;margin:auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:9px;text-decoration:none;font-weight:900}
.brand img{width:34px;height:34px;border-radius:8px}
.header-cta,.primary-cta{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 20px;border-radius:8px;background:var(--brand);color:#fff;text-decoration:none;font-weight:800}
.header-cta:hover,.primary-cta:hover{background:var(--brand-dark)}
.article{max-width:760px;margin:0 auto;padding:64px 20px 96px}
.breadcrumbs{font-size:.8rem;color:var(--muted);margin-bottom:30px}
.breadcrumbs a{text-decoration:none}
.eyebrow{color:var(--brand-dark);font-size:.78rem;font-weight:800;margin-bottom:10px}
h1{font-size:clamp(1.8rem,6vw,2.75rem);line-height:1.35;margin:0 0 18px}
.lead{font-size:1rem;color:var(--sub);margin:0 0 32px}
.hero-image{display:block;width:min(100%,460px);margin:36px auto 56px;border-radius:8px;border:1px solid var(--line)}
.toc{padding:20px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:0 0 54px}
.toc strong{display:block;font-size:.82rem;margin-bottom:8px}
.toc a{display:block;color:var(--sub);font-size:.9rem;text-decoration:none;padding:4px 0}
.article section{margin:0 0 54px;scroll-margin-top:86px}
h2{font-size:1.4rem;line-height:1.5;margin:0 0 18px}
h3{font-size:1.05rem;margin:28px 0 8px}
p{margin:0 0 18px;color:var(--sub)}
ul{margin:0 0 22px;padding-left:1.25rem;color:var(--sub)}
li{margin:8px 0}
.note{padding:16px 18px;background:var(--brand-soft);border-left:3px solid var(--brand);border-radius:0 6px 6px 0;font-size:.88rem;color:var(--sub)}
.app-example{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:34px;align-items:center;padding:28px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.app-example img{width:220px;border-radius:8px;border:1px solid var(--line)}
.cta-band{margin-top:64px;padding:34px 0;border-top:1px solid var(--line);text-align:center}
.cta-band h2{margin-bottom:10px}
.cta-band p{max-width:540px;margin:0 auto 22px}
.guide-index{max-width:820px;margin:0 auto;padding:64px 20px 96px}
.guide-list{margin-top:40px;border-top:1px solid var(--line)}
.guide-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px;align-items:center;padding:24px 2px;border-bottom:1px solid var(--line);text-decoration:none}
.guide-row:hover h2{color:var(--brand-dark)}
.guide-row h2{font-size:1.1rem;margin:0 0 5px}
.guide-row p{font-size:.88rem;margin:0}
.guide-row span{color:var(--brand-dark);font-size:1.3rem}
footer{border-top:1px solid var(--line);padding:32px 20px;text-align:center;color:var(--muted);font-size:.78rem}
.footer-links{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;margin-bottom:12px}
.footer-links a{text-decoration:none}
@media(max-width:640px){
  .article,.guide-index{padding-top:42px}
  .header-cta{padding:0 14px;font-size:.82rem}
  .app-example{grid-template-columns:1fr}
  .app-example img{width:min(100%,280px);margin:auto}
}