*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:var(--tg-theme-bg-color, #ffffff);color:var(--tg-theme-text-color, #000000)}.app{min-height:100vh;display:flex;flex-direction:column}.app__header{padding:16px;border-bottom:1px solid var(--tg-theme-hint-color, #e0e0e0)}.app__header h1{font-size:20px;font-weight:600}.app__main{flex:1;padding:16px}