:root{--navy:#0f2f5e;--navy-dark:#0a2144;--teal:#0d7a6f;--teal-bg:#f0faf8;--amber:#f5a623;--amber-dark:#d98c0a;--ink:#1a1a1a;--ink-soft:#444;--muted:#6b7684;--line:#e3e8ef;--bg:#fff;--bg-soft:#f6f8fb;--radius:10px;--maxw:1080px;--maxw-article:760px}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;word-break:break-word;overflow-wrap:anywhere;font-family:Hiragino Sans,Hiragino Kaku Gothic ProN,Yu Gothic Medium,Helvetica Neue,Arial,Noto Sans JP,sans-serif;font-size:16px;line-height:1.9}a{color:var(--teal);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto}.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}.container-narrow{max-width:var(--maxw-article);margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid 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