:root{--main:#175297;--sub:#2e74c7;--accent:#ff8901;--ink:#172033;--muted:#667085;--soft:#f3f7fb;--white:#fff;--border:#d8e2ed;--shadow:0 16px 40px rgba(23,82,151,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;line-height:1.8;background:#fff}img{max-width:100%;height:auto;vertical-align:middle}a{color:var(--main);text-decoration:none}a:hover{text-decoration:underline}button,input,textarea,select{font:inherit}.container{width:min(1120px,calc(100% - 40px));margin-inline:auto}.narrow-container{width:min(860px,calc(100% - 40px));margin-inline:auto}.screen-reader-text{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-100px;left:12px;z-index:9999;background:#fff;padding:10px 16px}.skip-link:focus{top:12px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:12px 26px;border-radius:4px;background:var(--main);color:#fff;font-weight:700;box-shadow:var(--shadow)}.button:hover{color:#fff;text-decoration:none;filter:brightness(1.05)}.button--accent{background:var(--accent);color:#1b2535}.section{padding:88px 0}.section--soft{background:var(--soft)}.section--blue{background:linear-gradient(135deg,var(--main),#0f3b6d);color:#fff}.section-label{margin:0 0 8px;color:var(--sub);font-weight:800;font-size:.82rem;letter-spacing:.18em}.section-label--light{color:#bcd9ff}h1,h2,h3{line-height:1.35;margin-top:0}h1{font-size:clamp(2rem,5vw,4rem)}h2{font-size:clamp(1.65rem,3vw,2.6rem)}h3{font-size:1.25rem}.section-lead{font-size:1.08rem;color:#38465a}.caution_message{margin:0 0 32px;padding:16px 18px;border-left:5px solid var(--accent);background:#fff7eb;color:#664318;font-weight:700}