:root{
  --blue:#287cff;--blue-2:#1f63cc;--ink:#142033;--muted:#66758b;
  --cream:#f8fbff;--line:#dfe8f5;--navy:#16335c;--green:#06c755;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans JP",sans-serif;color:var(--ink);background:#fff;line-height:1.95;-webkit-font-smoothing:antialiased;}
a{color:inherit;text-decoration:none}
.wrap{max-width:760px;margin:0 auto;padding:0 22px}

/* Header */
header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);}
.nav{max-width:1120px;margin:0 auto;padding:13px 22px;display:flex;align-items:center;justify-content:space-between;}
.logo{font-size:1.3rem;font-weight:900;letter-spacing:.04em;color:var(--ink);display:flex;align-items:center;gap:9px;}
.logo .lmark{width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,#3d8bff,#287cff);display:grid;place-items:center;color:#fff;font-weight:900;font-size:.95rem;flex:none;box-shadow:0 6px 16px -6px rgba(40,124,255,.7);}
.logo small{font-size:.58rem;letter-spacing:.18em;color:var(--blue);margin-left:6px;font-weight:700;}
.nav-actions{display:flex;gap:10px;align-items:center;}
.nav-actions a{font-size:.82rem;font-weight:700;padding:9px 16px;border-radius:40px;}
.nav-home{color:var(--blue);border:1px solid var(--line);}
.nav-line{background:var(--green);color:#fff;}

/* Article hero */
.ah{background:linear-gradient(160deg,#122c54,#16335c 55%,#1d4583);color:#fff;padding:62px 0 52px;}
.ah .cat{display:inline-block;background:var(--blue);color:#fff;font-size:.74rem;font-weight:700;letter-spacing:.06em;padding:6px 14px;border-radius:30px;margin-bottom:18px;}
.ah h1{font-size:clamp(1.5rem,3.8vw,2.2rem);font-weight:800;line-height:1.55;}
.ah .date{margin-top:16px;font-size:.82rem;color:rgba(255,255,255,.6);}

/* Body */
.article{padding:52px 0 20px;}
.article .lead{font-size:1.05rem;color:var(--ink);font-weight:500;margin-bottom:30px;}
.article h2{font-size:1.25rem;font-weight:800;margin:40px 0 14px;padding-left:14px;border-left:4px solid var(--blue);line-height:1.5;}
.article h3{font-size:1.05rem;font-weight:700;margin:26px 0 10px;color:var(--navy);}
.article p{margin-bottom:18px;color:#34404f;}
.article strong{color:var(--blue-2);font-weight:700;}
.article ul{margin:0 0 18px 0;list-style:none;display:flex;flex-direction:column;gap:11px;}
.article ul li{padding-left:30px;position:relative;color:#34404f;}
.article ul li::before{content:"";position:absolute;left:6px;top:11px;width:9px;height:9px;border-radius:50%;background:var(--blue);}
.article .note{background:var(--cream);border:1px solid var(--line);border-radius:14px;padding:22px 24px;margin:26px 0;font-size:.94rem;}
.article .note b{color:var(--blue);}

/* In-article CTA */
.acta{background:linear-gradient(135deg,#122c54,#1d4583);color:#fff;border-radius:20px;padding:42px 32px;text-align:center;margin:48px 0 12px;}
.acta h3{font-size:1.3rem;font-weight:800;margin-bottom:10px;}
.acta p{color:rgba(255,255,255,.82);font-weight:300;margin-bottom:24px;font-size:.94rem;}
.acta .btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}
.btn-primary{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#3d8bff,#287cff 60%,#1f63cc);color:#fff;font-weight:700;padding:15px 28px;border-radius:50px;}
.btn-line{display:inline-flex;align-items:center;gap:8px;background:var(--green);color:#fff;font-weight:700;padding:15px 26px;border-radius:50px;}

/* Back link */
.backrow{padding:6px 0 56px;}
.backrow a{color:var(--blue);font-weight:700;font-size:.9rem;}

/* Related */
.related{background:var(--cream);border-top:1px solid var(--line);padding:48px 0;}
.related h3{text-align:center;font-size:1.1rem;font-weight:800;margin-bottom:24px;color:var(--navy);}
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.rel-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 18px;transition:.3s;}
.rel-card:hover{box-shadow:0 14px 30px -18px rgba(40,124,255,.5);transform:translateY(-3px);}
.rel-card .rc{font-size:.68rem;font-weight:700;color:var(--blue);letter-spacing:.05em;}
.rel-card h4{font-size:.9rem;font-weight:700;margin-top:6px;line-height:1.55;color:var(--ink);}

/* Footer */
footer{background:#11233f;color:rgba(255,255,255,.6);padding:40px 0 28px;text-align:center;}
.foot-links{display:flex;gap:22px;justify-content:center;flex-wrap:wrap;font-size:.84rem;margin-bottom:18px;}
.foot-links a:hover{color:#7fb0ff;}
.foot-c{font-size:.72rem;color:rgba(255,255,255,.4);}

@media(max-width:680px){
  .rel-grid{grid-template-columns:1fr;}
}
@media(max-width:600px){
  .ah{padding:46px 0 38px;}
  .nav-actions .nav-home{display:none;}
  .acta{padding:32px 22px;}
  .acta .btns{flex-direction:column;}
  .acta .btns a{width:100%;justify-content:center;}
  .article h2{font-size:1.15rem;}
}