:root{--ink:#112d42;--muted:#647788;--blue:#0f5e91;--navy:#103b5c;--aqua:#e7f5f6;--line:#dbe5e9;--bg:#f6f9fa;--white:#fff;--red:#c83d38;--amber:#ae7310;--green:#148267;--shadow:0 8px 22px rgba(18,59,93,.08)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",sans-serif;line-height:1.6}.skip-link{position:absolute;left:-999px}.skip-link:focus{left:12px;top:12px;background:#fff;padding:8px;z-index:20}.site-header{background:var(--white);border-bottom:1px solid var(--line)}.header-inner{height:72px;max-width:1080px;margin:auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;line-height:1.1}.brand-mark{background:var(--blue);color:#fff;width:33px;height:33px;border-radius:10px;display:grid;place-items:center;font-size:20px}.brand strong{font-size:17px;display:block}.brand 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