:root{--bg:#fff;--text:#202124;--muted:#6b7280;--line:#e5e7eb;--soft:#f7f8fa;--accent:#1769aa;--warn:#fff7e6;--warn-border:#efb23f;--ok:#eef8f1;--ok-border:#4b9f68;--max:1120px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--text);background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;line-height:1.85}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.site-header{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:10}.header-inner{width:min(var(--max),calc(100% - 32px));margin:auto;min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:24px}.logo{font-weight:800;font-size:20px;color:var(--text)}.nav{display:flex;gap:18px;flex-wrap:wrap;font-size:14px}.container{width:min(var(--max),calc(100% - 32px));margin:auto}main{padding:38px 0 76px}.hero{padding:48px 0 30px}.hero h1{font-size:clamp(30px,5vw,52px);line-height:1.25;margin:0 0 16px;max-width:850px}.hero p{color:var(--muted);max-width:800px;font-size:17px}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.card{border:1px solid var(--line);border-radius:14px;padding:22px;background:#fff}.card h2,.card h3{margin-top:0;line-height:1.5}.badge{display:inline-block;font-size:12px;background:var(--soft);border:1px solid var(--line);padding:4px 9px;border-radius:999px;color:var(--muted);margin-bottom:10px}.meta{color:var(--muted);font-size:13px}.article{max-width:860px;margin:auto}.article h1{font-size:clamp(28px,4vw,42px);line-height:1.35;margin-bottom:14px}.article h2{margin:50px 0 18px;font-size:27px;line-height:1.5;padding-left:14px;border-left:5px solid var(--accent)}.article h3{margin:32px 0 12px;font-size:21px}.article p{margin:0 0 18px}.lead{font-size:17px}.notice,.factbox{padding:18px 20px;border-radius:10px;margin:24px 0}.notice{background:var(--warn);border:1px solid var(--warn-border)}.factbox{background:var(--ok);border:1px solid var(--ok-border)}.toc{background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:20px 24px;margin:30px 0}.toc ul{margin:8px 0 0;padding-left:22px}table{width:100%;border-collapse:collapse;margin:20px 0 28px}th,td{border:1px solid var(--line);padding:12px 14px;vertical-align:top}th{background:var(--soft);text-align:left}.qa{border-top:1px solid var(--line);padding:18px 0}.policy-box{border:1px solid var(--line);border-radius:14px;padding:24px;background:var(--soft)}.footer{border-top:1px solid var(--line);padding:32px 0 50px;color:var(--muted);font-size:14px}.footer-links{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:12px}.small{font-size:13px;color:var(--muted)}.form-row{margin:18px 0}.form-row label{display:block;font-weight:700;margin-bottom:6px}.form-row input,.form-row textarea,.form-row select{width:100%;font:inherit;padding:11px 12px;border:1px solid var(--line);border-radius:8px}.form-row textarea{min-height:180px}.btn{border:0;border-radius:8px;background:var(--accent);color:#fff;font:inherit;font-weight:700;padding:12px 22px;cursor:pointer}.status{margin-top:14px;font-weight:700}@media(max-width:820px){.grid{grid-template-columns:1fr}.header-inner{align-items:flex-start;padding:14px 0;flex-direction:column;gap:8px}.site-header{position:static}}