:root{--paper:#f5f4ef;--surface:#fff;--ink:#1f2925;--muted:#52605a;--accent:#294c41;--line:#cbcfc6;--detail:#eff2e9;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Yu Gothic",Meiryo,sans-serif;color:var(--ink);background:var(--paper);font-size:15px;line-height:1.7}*{box-sizing:border-box}body{margin:0}header{background:var(--surface);border-bottom:1px solid var(--line);padding:16px max(24px,calc((100vw - 1280px)/2));display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{font-size:24px;font-weight:700;text-decoration:none;color:var(--accent);line-height:1.3}.brand span{display:block;font-size:12px;font-weight:400;letter-spacing:.04em;color:var(--muted);margin-top:5px}#account{display:flex;align-items:center;gap:12px;font-size:13px}main{max-width:1280px;margin:auto;padding:28px 24px 64px}h1,h2,h3,p{margin:0 0 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