:root{--blue:#2962a3;--blue-dark:#174879;--ink:#23272d;--muted:#6a737d;--line:#d9dee5;--bg:#f4f5f7;--panel:#fff;--max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;max-width:100%;overflow-x:hidden;color:var(--ink);background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;line-height:1.82}.op-skip{position:absolute;left:-9999px}.op-skip:focus{left:1rem;top:1rem;z-index:99;background:#fff;padding:.7rem 1rem}.op-site-header{background:var(--blue);border-bottom:4px solid var(--blue-dark);color:#fff}.op-header-inner{max-width:var(--max);margin:auto;min-height:68px;padding:0 18px;display:flex;align-items:center;justify-content:space-between;gap:24px}.op-brand{color:#fff;text-decoration:none;display:flex;align-items:baseline;gap:12px}.op-brand strong{font-size:1.22rem}.op-brand small{opacity:.82}.op-nav{display:flex;gap:4px;flex-wrap:wrap}.op-nav a{color:#fff;text-decoration:none;padding:9px 11px;font-size:.9rem}.op-nav a:hover,.op-nav a:focus-visible{background:rgba(255,255,255,.15)}.op-breadcrumbs{max-width:var(--max);margin:0 auto;padding:12px 18px;overflow:hidden}.op-breadcrumbs ol{display:flex;gap:8px;list-style:none;padding:0;margin:0;font-size:.82rem;color:var(--muted);min-width:0}.op-breadcrumbs li{min-width:0;white-space:nowrap}.op-breadcrumbs li:last-child{overflow:hidden;text-overflow:ellipsis}.op-breadcrumbs li+li:before{content:"›";margin-right:8px;color:#9aa2ab}.op-breadcrumbs a{color:var(--blue)}.op-main{width:100%;max-width:var(--max);margin:auto;padding:0 18px 44px}.op-panel{max-width:100%;background:var(--panel);border:1px solid var(--line);box-shadow:0 1px 2px rgba(0,0,0,.04)}.op-article-layout{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:18px;align-items:start;max-width:100%}.op-article{min-width:0}.op-article-header{padding:28px 30px 22px;border-bottom:1px solid var(--line);min-width:0}.op-eyebrow{margin:0 0 5px;color:var(--blue);font-size:.82rem;font-weight:700}.op-article h1{font-size:clamp(1.85rem,3.7vw,2.6rem);line-height:1.28;margin:0;overflow-wrap:anywhere}.op-deck{max-width:100%;font-size:1rem;color:#4d5660;margin:13px 0 0;overflow-wrap:anywhere}.op-gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:var(--line);border-bottom:1px solid var(--line)}.op-gallery figure{margin:0;background:#fff;min-width:0}.op-gallery img{display:block;width:100%;height:235px;object-fit:contain;background:#eef1f4}.op-gallery figcaption{font-size:.72rem;color:var(--muted);padding:7px 9px;line-height:1.45}.op-article-body{padding:12px 30px 34px;font-family:"Yu Mincho","Hiragino Mincho ProN",serif}.op-article-body h2{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Yu Gothic",sans-serif;font-size:1.35rem;line-height:1.45;margin:2.4rem 0 .8rem;padding:0 0 .45rem;border-bottom:2px solid var(--blue)}.op-article-body p{margin:.72rem 0}.op-article-body a,.op-toc a,.op-card a{color:#1d5f9f}.op-article-body ul{padding-left:1.4rem}.op-spoiler{border-left:4px solid #d58000;background:#fff8e8;padding:12px 16px;margin:18px 0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Yu Gothic",sans-serif}.op-spoiler p{margin:.3rem 0 0}.op-toc{position:sticky;top:14px;padding:18px}.op-toc h2{font-size:1rem;margin:0 0 10px}.op-toc ol{padding-left:1.25rem;margin:0}.op-toc li{font-size:.84rem;margin:.45rem 0;line-height:1.5}.op-hero{width:100%;max-width:100%;background:#fff;border:1px solid var(--line);padding:35px 30px;margin-bottom:18px;min-width:0}.op-hero h1{margin:0;font-size:clamp(2rem,5vw,3.25rem);line-height:1.2;overflow-wrap:anywhere}.op-hero p{max-width:760px;color:#4d5660;overflow-wrap:anywhere}.op-search{display:grid;grid-template-columns:minmax(0,1fr) auto;width:100%;max-width:720px;margin-top:20px;min-width:0}.op-search input{width:100%;min-width:0;border:2px solid var(--blue);padding:13px 14px;font-size:1rem}.op-search button{border:0;background:var(--blue);color:#fff;padding:0 22px;font-weight:700}.op-section{width:100%;max-width:100%;background:#fff;border:1px solid var(--line);padding:22px 24px;margin:16px 0;min-width:0}.op-section h2{margin:0 0 14px;font-size:1.25rem}.op-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.op-card{border-top:3px solid var(--blue);background:#f9fafb;padding:14px;min-width:0}.op-card small{display:block;color:var(--muted);font-size:.75rem}.op-card a{font-weight:700;text-decoration:none}.op-card p{font-size:.82rem;color:#59616a;margin:.5rem 0 0}.op-filters{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:15px}.op-filter{border:1px solid var(--line);background:#fff;padding:7px 11px;cursor:pointer}.op-filter[aria-pressed="true"]{background:var(--blue);color:#fff;border-color:var(--blue)}.op-footer{border-top:1px solid var(--line);background:#fff}.op-footer>div{max-width:var(--max);margin:auto;padding:24px 18px;color:var(--muted);font-size:.82rem}.op-footer nav{display:flex;gap:14px;flex-wrap:wrap}.op-footer a{color:var(--blue)}[hidden]{display:none!important}@media(max-width:850px){.op-header-inner{align-items:flex-start;flex-direction:column;padding-top:12px;padding-bottom:12px;gap:6px}.op-nav{overflow-x:auto;width:100%;max-width:100%;flex-wrap:nowrap}.op-nav a{white-space:nowrap}.op-article-layout{grid-template-columns:minmax(0,1fr)}.op-toc{position:static;order:-1}.op-gallery{grid-template-columns:1fr}.op-gallery img{height:auto;max-height:460px}.op-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:540px){.op-main{padding-left:10px;padding-right:10px}.op-breadcrumbs{padding-left:12px;padding-right:12px}.op-article-header,.op-article-body{padding-left:18px;padding-right:18px}.op-grid{grid-template-columns:1fr}.op-brand{display:block}.op-brand small{display:block}.op-hero{padding:30px}.op-search{grid-template-columns:minmax(0,1fr) 68px}.op-search button{padding:0 10px}.op-toc{max-height:330px;overflow:auto}}.op-home{padding-top:0}.op-home-intro{padding:20px 22px 18px;border-top:3px solid var(--blue-dark)}.op-home-intro h1{margin:0;font-size:1.72rem;line-height:1.35}.op-home-intro p{margin:7px 0 0;max-width:850px;color:#4d5660;font-size:.92rem}.op-home-meta{display:flex;gap:16px;flex-wrap:wrap;margin-top:12px;color:var(--muted);font-size:.78rem}.op-home-meta strong{color:var(--ink);font-size:.95rem}.op-home-search-panel{margin-top:12px;padding:18px 22px;border-top:4px solid var(--blue)}.op-home-search-panel h2{font-size:1.05rem;margin:0 0 4px}.op-home-search-panel>p{margin:0;color:var(--muted);font-size:.82rem}.op-home-search{display:grid;grid-template-columns:minmax(0,1fr) 84px;max-width:760px;margin-top:12px}.op-home-search input{min-width:0;border:2px solid var(--blue);padding:11px 12px;font:inherit}.op-home-search button{border:0;background:var(--blue);color:#fff;font-weight:700}.op-home-search-results{max-width:760px;margin-top:10px;border:1px solid var(--line);background:#fff}.op-home-search-results p{margin:0;padding:8px 12px;border-bottom:1px solid var(--line);font-size:.78rem;color:var(--muted)}.op-home-search-results ul{list-style:none;margin:0;padding:0;max-height:330px;overflow:auto}.op-home-search-results li+li{border-top:1px solid #edf0f3}.op-home-search-results a{display:flex;gap:10px;align-items:baseline;padding:9px 12px;color:#195a96;text-decoration:none}.op-home-search-results small{color:var(--muted);min-width:74px}.op-home-topics{display:flex;gap:0;margin:12px 0 14px;overflow-x:auto;border:1px solid var(--line);background:#fff}.op-home-topics a{flex:0 0 auto;padding:9px 15px;border-right:1px solid var(--line);color:#195a96;font-size:.82rem;font-weight:700;text-decoration:none}.op-home-topics a:first-child{background:var(--blue);color:#fff}.op-home-layout{display:grid;grid-template-columns:minmax(0,1fr) 286px;gap:14px;align-items:start}.op-home-section,.op-home-side{background:#fff;border:1px solid var(--line)}.op-home-heading{display:flex;align-items:baseline;justify-content:space-between;gap:14px;padding:12px 16px;border-top:3px solid var(--blue-dark);border-bottom:1px solid var(--line)}.op-home-heading h2,.op-home-side h2{margin:0;font-size:1.05rem}.op-home-heading a{font-size:.78rem;color:#195a96}.op-home-feature{display:grid;grid-template-columns:144px minmax(0,1fr);gap:14px;padding:13px 15px}.op-home-feature+.op-home-feature{border-top:1px solid var(--line)}.op-home-feature img{display:block;width:144px;height:90px;object-fit:cover;background:#eef1f4}.op-home-feature p{margin:0}.op-home-feature .op-home-type{color:var(--blue);font-size:.72rem;font-weight:700}.op-home-feature h3{font-size:1rem;line-height:1.45;margin:2px 0}.op-home-feature h3 a{color:#195a96;text-decoration:none}.op-home-feature .op-home-excerpt{color:#58616a;font-size:.78rem;line-height:1.55}.op-home-side{margin-bottom:14px}.op-home-side h2{padding:11px 13px;border-top:3px solid var(--blue);border-bottom:1px solid var(--line)}.op-home-category-list,.op-home-recent{list-style:none;margin:0;padding:0}.op-home-category-list li,.op-home-recent li{border-top:1px solid #edf0f3}.op-home-category-list li:first-child,.op-home-recent li:first-child{border-top:0}.op-home-category-list a{display:flex;justify-content:space-between;gap:10px;padding:8px 12px;color:#195a96;text-decoration:none;font-size:.82rem}.op-home-category-list strong{color:var(--muted);font-size:.75rem}.op-home-recent a{display:block;padding:8px 12px;color:#195a96;text-decoration:none;font-size:.8rem;line-height:1.45}.op-home-recent time{display:block;color:var(--muted);font-size:.7rem}.op-home-note{padding:11px 13px;margin:0;color:#58616a;font-size:.76rem;line-height:1.6}.op-home a:hover{text-decoration:underline}.op-home a:focus-visible,.op-home input:focus-visible,.op-home button:focus-visible{outline:3px solid #e3a520;outline-offset:2px}@media(max-width:850px){.op-home-layout{grid-template-columns:minmax(0,1fr)}.op-home-sidebar{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.op-home-side{margin:0}}@media(max-width:560px){.op-home-intro,.op-home-search-panel{padding:16px 14px}.op-home-intro h1{font-size:1.42rem}.op-home-search{grid-template-columns:minmax(0,1fr) 66px}.op-home-feature{grid-template-columns:104px minmax(0,1fr);gap:10px;padding:11px}.op-home-feature img{width:104px;height:76px}.op-home-feature .op-home-excerpt{display:none}.op-home-sidebar{grid-template-columns:1fr}.op-home-heading{padding:10px 12px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}:root{--blue:#17678e;--blue-dark:#0c3d59;--accent:#b43a2c;--gold:#c9952e;--ink:#23262a;--muted:#62676e;--line:#d8d0c3;--bg:#f3efe7;--panel:#fffdfa}.op-site-header{background:var(--blue-dark);border-bottom-color:var(--gold)}.op-home-intro{border-top-color:var(--blue-dark)}.op-home-search-panel{border-top-color:var(--gold)}.op-home-search-results,.op-home-topics,.op-home-section,.op-home-side{background:var(--panel)}.op-home-search-results li+li,.op-home-category-list li,.op-home-recent li{border-color:#eee7dc}.op-home-search-results a,.op-home-topics a,.op-home-heading a,.op-home-feature h3 a,.op-home-category-list a,.op-home-recent a{color:#155f87}.op-home-topics a:first-child{background:var(--accent)}.op-home-heading{border-top-color:var(--blue-dark)}.op-home-side h2{border-top-color:var(--gold)}.op-home-feature img,.op-gallery img{background:#ebe4d8}.op-home-feature .op-home-excerpt,.op-home-note{color:#62676e}.op-card{background:#faf6ee}.op-filter[aria-pressed="true"]{background:var(--accent);border-color:var(--accent)}.op-home a:focus-visible,.op-home input:focus-visible,.op-home button:focus-visible{outline-color:var(--gold)}