*,:after,:before{box-sizing:border-box}body,html{margin:0;padding:0;font-family:Noto Sans JP,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background-color:#f8f9fa;color:#212529;overflow-x:hidden}a{color:inherit;text-decoration:none}:root{--top-nav-height:60px;--bottom-nav-height:0px}.ja-title{font-family:var(--font-shippori-mincho),"Noto Serif JP",serif}.bottom-nav{display:none}.top-nav{display:flex}@media (max-width:639px){:root{--top-nav-height:0px;--bottom-nav-height:calc(60px + env(safe-area-inset-bottom, 0px))}.top-nav{display:none}.bottom-nav{display:flex}.app-content{padding-bottom:var(--bottom-nav-height)}}