:root{--bg: #f5f6f5;--surface: #fff;--ink: #20221f;--muted: #5e625a;--line: #d9dcd2;--primary: #20221f;--sage: #9cab8c;--lime: #d5edaf;--font-en: "Plus Jakarta Sans", sans-serif;--font-ja: "Zen Kaku Gothic New", sans-serif;--mono: "JetBrains Mono", monospace}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;scroll-padding-top:112px}body{background:var(--surface);color:var(--ink);font:500 16px/1.9 var(--font-ja);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}a:focus-visible{outline:2px solid var(--ink);outline-offset:6px}img{display:block;max-width:100%;height:auto}.shell{width:min(100% - 144px,1240px);margin-inline:auto}.accent{color:inherit}.btn{display:inline-flex;align-items:center;justify-content:center;gap:28px;min-height:48px;padding:12px 24px;border:1px solid transparent;border-radius:50px;font-size:14px;font-weight:700;transition:background .2s,color 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