:root{--accent: #b4e600;--accent-deep: #7cb305;--link: #4d7c0f;--ink: #14161a;--sub: #6b7280;--line: #e6e8ea;--bg: #ffffff;--bg-soft: #f6f8f2;color-scheme:light}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Hiragino Sans,Noto Sans JP,Segoe UI,sans-serif;line-height:1.85;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto}.container{width:100%;max-width:760px;margin:0 auto;padding:0 18px}.site-header{border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--bg);z-index:10}.site-header .inner{display:flex;align-items:baseline;gap:12px;max-width:760px;margin:0 auto;padding:16px 18px}.brand{font-size:22px;font-weight:800;letter-spacing:-.02em;color:var(--ink)}.brand .mark{background:var(--accent);color:var(--ink);padding:0 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