:root { font-family: system-ui, Avenir, Helvetica, Arial, sans-serif; line-height: 1.5; font-weight: 400; font-synthesis: none; text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; } a { font-weight: 500; color: #646cff; text-decoration: inherit; } a:hover { color: #535bf2; } body { margin: 0; display: flex; place-items: center; min-width: 320px; min-height: 100vh; } h1 { font-size: 3.2em; line-height: 1.1; } .card { padding: 2em; } #app { max-width: 1280px; margin: 0 auto; padding: 2rem; text-align: center; } button { border-radius: 8px; border: 1px solid transparent; padding: 0.6em 1.2em; font-size: 1em; font-weight: 500; background-color: #1a1a1a; cursor: pointer; transition: border-color 0.25s; }