:root{--navy:#123a63;--blue:#1d6aa8;--pale:#eef6fb;--text:#24313d;--line:#d9e2ea;--warn:#fff5d6}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;color:var(--text);line-height:1.75}header{background:var(--navy);color:#fff;padding:22px max(20px,calc((100% - 1040px)/2))}.brand{font-size:1.35rem;font-weight:700}nav{border-bottom:1px solid var(--line)}nav div,main,footer div{max-width:1040px;margin:auto;padding:0 20px}nav a{display:inline-block;padding:13px 18px 13px 0;color:var(--navy);text-decoration:none;font-weight:600}main{padding-top:34px;padding-bottom:60px}.notice{background:var(--warn);border-left:5px solid #d6a400;padding:18px;margin-bottom:28px}.button{display:inline-block;background:var(--blue);color:#fff;text-decoration:none;border-radius:6px;padding:12px 22px;font-weight:700}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px}.card{border:1px solid var(--line);border-radius:8px;padding:17px}h1,h2{color:var(--navy)}footer{background:#eef2f5;padding:25px 0}