:root{color-scheme:light;--ink:#15223b;--muted:#58677c;--line:#dce5ee;--blue:#265ca3;--bg:#f6f9fc;--white:#fff}
*{box-sizing:border-box}html{font-family:system-ui,-apple-system,"Noto Sans JP","Hiragino Kaku Gothic ProN",sans-serif;line-height:1.75}body{margin:0;color:var(--ink);background:var(--bg)}.wrap{width:min(920px,calc(100% - 40px));margin:auto}header{background:#142946;color:#fff;padding:18px 0}header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}header a{color:#e8f2ff;text-decoration:none;font-size:.94rem}header nav{display:flex;gap:20px;flex-wrap:wrap}.brand{font-size:1.06rem;font-weight:700}.hero{padding:70px 0 35px}.eyebrow{color:var(--blue);font-weight:700;letter-spacing:.06em;font-size:.85rem}h1{font-size:clamp(1.75rem,4vw,2.6rem);line-height:1.35;letter-spacing:-.025em;margin:.5rem 0 1rem}h2{font-size:1.3rem;line-height:1.5;margin:0 0 .9rem}h3{font-size:1.05rem;margin:1.3rem 0 .35rem}p,li{color:#37465c}p.lead{font-size:1.1rem;max-width:730px}.card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:clamp(22px,4vw,38px);margin:24px 0;box-shadow:0 5px 18px rgba(29,48,80,.025)}ul{padding-left:1.4rem}li{margin:.45rem 0}a{color:#1a559d;text-underline-offset:3px;overflow-wrap:anywhere}a:hover{text-decoration-thickness:2px}.tag{display:inline-block;background:#e9f2ff;color:#23548e;padding:4px 11px;font-weight:650;font-size:.85rem;border-radius:100px}.cta{display:inline-block;background:#205eab;color:#fff;text-decoration:none;padding:12px 18px;border-radius:10px;font-weight:650;margin-top:9px}.cta:hover{background:#18477f}.note{background:#edf4fb;border-left:4px solid #4380bf;padding:12px 16px;border-radius:5px}footer{padding:30px 0 40px;border-top:1px solid var(--line);font-size:.86rem;color:var(--muted)}footer a{margin-right:16px}.meta{font-size:.9rem;color:var(--muted)}@media(max-width:620px){.hero{padding-top:42px}header .wrap{align-items:flex-start}}