.app{width:100%;max-width:1200px;margin:0 auto}.app-header{margin-bottom:2rem}.app-header h1{color:#333;margin-bottom:1rem}.app-header nav{display:flex;gap:1rem;justify-content:center}.app-header button{padding:.5rem 1rem;background-color:#f0f0f0;border:1px solid #ddd;border-radius:4px;cursor:pointer;font-size:1rem;transition:all .2s}.app-header button:hover{background-color:#e0e0e0}.app-header button.active{background-color:#4a90e2;color:#fff;border-color:#3a80d2}main{padding:1rem;border-radius:8px;min-height:500px}:root{font-family:Inter,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}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}#root{max-width:1280px;margin:0 auto;padding:2rem;text-align:center}