*,:after,:before{box-sizing:border-box}html{color-scheme:light}body{margin:0;color:#1a1a1a;background:#fff;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Sans,Noto Sans JP,Yu Gothic,sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased}main{max-width:720px;margin:0 auto;padding:clamp(1.5rem,5vw,2.5rem) 1rem}h1{font-size:clamp(1.6rem,4.5vw,2rem);margin:0 0 1rem;line-height:1.3}h2{font-size:clamp(1.2rem,3vw,1.4rem);margin:2rem 0 .75rem}h2,h3{line-height:1.4}h3{font-size:1.1rem;margin:1.5rem 0 .5rem}ol,p,ul{margin:0 0 1rem}ol,ul{padding-left:1.25rem}li{margin:.25rem 0}a{color:#0366d6;text-decoration:underline;text-underline-offset:2px}a:hover{text-decoration:none}hr{border:0;border-top:1px solid #e5e5e5;margin:2rem 0}img{max-width:100%;height:auto}.app-header{display:flex;flex-direction:column;align-items:center;text-align:center;gap:.75rem;margin:1rem 0 1.5rem}.app-header h1{margin:0}.app-header .catchphrase{color:#555;margin:0;font-size:1rem}.nav-back{display:inline-block;margin-top:2rem;font-size:.95rem}.meta{color:#777;font-size:.9rem}