:root{--navy:#0b416d;--navy2:#082f50;--blue:#087eb8;--sky:#f3f9fc;--gold:#f4c54f;--ink:#15374f;--text:#385568;--muted:#647d8e;--line:#c8dce8}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--sky);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Yu Gothic",sans-serif;line-height:1.85}a{color:var(--blue)}.top{background:var(--navy2);color:#fff;border-bottom:2px solid var(--gold)}.nav{width:min(1040px,92vw);min-height:72px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-weight:900;letter-spacing:.04em;color:#fff;text-decoration:none}.back{color:#d8ebf5;text-decoration:none;font-size:14px;font-weight:800}.page{width:min(900px,92vw);margin:44px auto 72px;padding:42px 48px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 14px 40px rgba(8,47,80,.08)}.eyebrow{color:var(--blue);font-size:12px;font-weight:900;letter-spacing:.12em}.page h1{margin:5px 0 8px;font-size:clamp(31px,5vw,44px);line-height:1.3}.lead{margin:0 0 30px;color:var(--muted)}.toc{margin:28px 0;padding:18px 22px;background:#f5fafc;border-left:4px solid var(--blue);border-radius:6px}.toc b{display:block;margin-bottom:7px}.toc ol{margin:0;padding-left:22px;columns:2}.toc a{text-decoration:none}.page section{padding-top:22px;margin-top:22px;border-top:1px solid #dce7ed}.page h2{margin:0 0 10px;font-size:21px}.page h3{font-size:17px;margin:18px 0 6px}.page p{margin:8px 0;color:var(--text)}.page ol,.page ul{color:var(--text);padding-left:24px}.page li{margin:6px 0}.note{margin:20px 0;padding:14px 16px;background:#fff8e4;border-left:4px solid var(--gold);color:#614d14}.meta{margin-top:36px;padding:18px;background:#edf6fa;border-radius:8px;color:#3e5d70;font-size:14px}.placeholder{font-weight:900;color:#9c4e17}.footer{padding:26px;background:var(--navy2);color:#bcd1de;text-align:center;font-size:12px}@media(max-width:640px){.page{margin:22px auto 48px;padding:28px 20px}.toc ol{columns:1}.nav{min-height:64px}.page h2{font-size:19px}}