body{margin:0;padding:0;background:radial-gradient(circle at top,#0f2027,#203a43,#2c5364);font-family:Roboto,sans-serif;min-height:100vh;display:flex;justify-content:center;align-items:center;scroll-behavior:smooth}.app-container{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:24px;box-sizing:border-box}