:root{--paper:#f3f6fb;--card:#fff;--ink:#121826;--muted:#667085;--accent:#3157c8;--border:#dce3f0} @media(prefers-color-scheme:dark){:root{--paper:#0f1420;--card:#171e2d;--ink:#f5f7ff;--muted:#aab4ca;--accent:#8ba7ff;--border:#2c3850}} *{box-sizing:border-box} body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP",sans-serif;line-height:1.85;-webkit-text-size-adjust:100%}.wrap{max-width:760px;margin:0 auto;padding:40px 20px 80px}.eyebrow{color:var(--accent);font-size:13px;font-weight:800;letter-spacing:2px;margin:0 0 6px}h1{font-size:30px;margin:0 0 6px}h2{font-size:19px;margin:34px 0 10px}.updated,.muted,footer{color:var(--muted);font-size:13px}p,li{font-size:15px}a{color:var(--accent);font-weight:700;text-decoration:none}a:hover{text-decoration:underline}.nav{margin-bottom:26px;font-size:14px}.nav a{margin-right:16px}.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:18px 20px;margin:18px 0}footer{margin-top:40px}