:root{--ink:#15231c;--muted:#637068;--bg:#f6f8f5;--card:#fff;--line:#dfe7e1;--accent:#147a4f;--accent2:#0f5e3e;--soft:#e8f5ee;--warn:#a35b00;--radius:20px;--shadow:0 18px 55px rgba(21,35,28,.09)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP","Hiragino Kaku Gothic ProN",Meiryo,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7}a{color:var(--accent)}.container{width:min(1120px,calc(100% - 40px));margin:auto}.narrow{width:min(760px,calc(100% - 40px));margin:auto}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(223,231,225,.8)}.header-inner{height:72px;display:flex;align-items:center;justify-content:space-between}.logo{font-weight:800;text-decoration:none;color:var(--ink);letter-spacing:-.03em}.logo 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