:root{--ink: #14231f;--muted: #5e6b67;--green: #23644f;--green-dark: #174737;--mint: #eaf4ef;--sand: #f5f0e6;--paper: #fffdf8;--white: #ffffff;--line: #d8e0dc;--shadow: 0 20px 50px rgba(20, 35, 31, .08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:radial-gradient(circle at 10% 0%,rgba(216,235,226,.72),transparent 34rem),var(--paper);font-family:Hiragino Kaku Gothic ProN,Hiragino Sans,Yu Gothic UI,Noto Sans JP,system-ui,sans-serif;font-size:16px;line-height:1.85}a{color:var(--green)}header{position:sticky;z-index:10;top:0;border-bottom:1px solid rgba(216,224,220,.82);background:#fffdf8f0;backdrop-filter:blur(14px)}.nav{display:flex;align-items:center;justify-content:space-between;max-width:72rem;min-height:4.7rem;margin:0 auto;padding:.75rem 1.5rem;gap:1.5rem}.brand{display:grid;color:var(--ink);font-size:1.28rem;font-weight:800;letter-spacing:.03em;line-height:1.1;text-decoration:none}.brand 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