:root{
  --navy:#1a2b4a; --blue:#2563eb; --blue-dark:#1d4ed8; --bg:#f7f9fc;
  --text:#26303e; --muted:#5b6675; --line:#e3e8f0;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP",Meiryo,sans-serif;color:var(--text);background:#fff;line-height:1.9}
.wrap{max-width:760px;margin:0 auto;padding:0 20px}
header{border-bottom:1px solid var(--line);padding:14px 0;background:#fff}
.brand{font-weight:800;font-size:18px;color:var(--navy);text-decoration:none}
.brand span{color:var(--blue)}
article{padding:40px 0 56px}
h1{font-size:28px;line-height:1.5;color:var(--navy);margin-bottom:12px}
.meta{font-size:13px;color:var(--muted);margin-bottom:28px}
h2{font-size:22px;color:var(--navy);margin:44px 0 16px;padding-left:12px;border-left:4px solid var(--blue)}
h3{font-size:17px;color:var(--navy);margin:28px 0 10px}
p{margin-bottom:16px}
ul,ol{margin:0 0 16px 24px}
li{margin-bottom:6px}
.reibun{background:var(--bg);border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:0 10px 10px 0;padding:16px 18px;margin:14px 0;font-size:14.5px}
.reibun b{color:var(--blue);display:block;font-size:12.5px;margin-bottom:6px}
.ng-box{background:#fef2f2;border:1px solid #fecaca;border-radius:10px;padding:16px 18px;margin:14px 0;font-size:14.5px}
.ok-box{background:#f0fdf4;border:1px solid #bbf7d0;border-radius:10px;padding:16px 18px;margin:14px 0;font-size:14.5px}
table{width:100%;border-collapse:collapse;margin:16px 0;font-size:14px}
th,td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
th{background:var(--bg);color:var(--navy)}
.cta-box{background:linear-gradient(135deg,#1a2b4a,#1d4ed8);border-radius:14px;padding:32px 28px;margin:48px 0 0;text-align:center;color:#fff}
.cta-box h2{color:#fff;border:none;padding:0;margin:0 0 10px;font-size:20px}
.cta-box p{font-size:14px;opacity:.9}
.cta-btn{display:inline-block;background:#fff;color:var(--blue);font-weight:800;padding:14px 40px;border-radius:10px;text-decoration:none;margin-top:14px}
.related{margin-top:40px;padding-top:24px;border-top:1px solid var(--line)}
.related h2{border:none;padding:0;font-size:16px;margin:0 0 12px}
.related a{display:block;color:var(--blue);text-decoration:none;padding:6px 0;font-size:14.5px}
footer{padding:28px 0;border-top:1px solid var(--line);font-size:12px;color:var(--muted);text-align:center}
@media(max-width:600px){h1{font-size:23px}h2{font-size:19px}}