:root{--transition: .15s}body{font-family:Noto Sans JP,sans-serif;font-optical-sizing:auto;font-weight:400;font-style:normal}h1{font-size:36px;letter-spacing:.1em}.form-control::placeholder{color:#999}label,button{-webkit-user-select:none;user-select:none}li{transition:var(--transition)}li:hover{background:#f6f8fa}input[type=checkbox]:checked+span{text-decoration:line-through}button{white-space:nowrap}button:has(span){background-color:transparent;border:none;display:flex;align-items:center;white-space:nowrap;transition:var(--transition)}button:has(span):hover{opacity:50%;cursor:default}