:root{--ink:#203a53;--blue:#2267a0;--light:#eaf3f9;--orange:#db813c;--paper:#fbfaf6;--line:#dbe2e5;--muted:#5f7281;--white:#fff;--shadow:0 12px 35px #203a5309}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;line-height:1.8}a{color:var(--blue);text-decoration:none}button,input{font:inherit}button,a{touch-action:manipulation}a:hover{text-decoration:underline}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:5px}button{cursor:pointer}header{border-bottom:1px solid var(--line);background:#fffdf9}nav{max-width:1180px;padding:20px 32px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-size:18px;font-weight:800;color:var(--ink);letter-spacing:.03em}.brand 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