body{margin:0;font-family:Noto Sans JP,sans-serif;background:#f5f5f5;color:#333}header,footer{background:#2e7d32;color:#fff;text-align:center;padding:1rem;opacity:.95}nav.tabs{display:flex;justify-content:center;background:#388e3c}nav.tabs button{background:none;border:none;color:#fff;padding:1rem;cursor:pointer;font-size:1rem}nav.tabs button.active{border-bottom:3px solid #ffeb3b}main{max-width:960px;margin:2rem auto;background:#fff;padding:2rem;min-height:60vh}footer p{margin:0;font-size:.9rem}select{position:absolute;top:1rem;right:1rem}section img{width:100%;height:auto;display:block;margin:1rem auto}.app{background:url(./home-DHuDaXQv.jpg) no-repeat center center fixed}.link{color:#ffeb3b}