:root{--navy: #16324a;--navy-deep: #0d2233;--fuji: #d94f3d;--fuji-soft: #f7e8e5;--sky: #eef4f8;--teal: #1a7f8e;--ink: #22303a;--muted: #61707c;--line: #dde5ea;--bg: #ffffff;--radius: 14px;--shadow: 0 6px 24px rgba(13, 34, 51, .08);--font: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}img,svg{max-width:100%;display:block}a{color:inherit;text-decoration:none}.container{max-width:1080px;margin:0 auto;padding:0 20px}.site-header{position:sticky;top:0;z-index:50;background:#fffffff2;backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}.site-header .inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}.brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.02em}.brand .mark{width:34px;height:34px}.brand 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