:root{color:#213547;-webkit-tap-highlight-color:transparent;-webkit-font-smoothing:antialiased;background-color:#fff;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:16px;line-height:1.5}*{box-sizing:border-box;margin:0;padding:0}.app{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:1.5rem;min-height:100svh;padding:2rem;display:flex}.app h1{font-size:2rem;font-weight:700}.counter-btn{color:#fff;cursor:pointer;background-color:#646cff;border:none;border-radius:.5rem;padding:.75rem 2rem;font-size:1rem;font-weight:600;transition:background-color .2s}.counter-btn:active{background-color:#535bf2}