.app{min-height:100vh;display:flex;flex-direction:column}.app-header{background:#fff;padding:2rem;box-shadow:0 2px 4px #0000001a}.app-header h1{margin:0 0 .5rem;color:#333}.app-header p{margin:0;color:#666}.app-nav{display:flex;gap:.5rem;padding:1rem 2rem;background:#fff;border-bottom:1px solid #e0e0e0}.app-nav button{padding:.75rem 1.5rem;border:none;background:#f5f5f5;color:#333;cursor:pointer;border-radius:4px;font-size:14px;font-weight:500;transition:all .2s}.app-nav button:hover{background:#e0e0e0}.app-nav button.active{background:#2196f3;color:#fff}.app-content{flex:1;padding:2rem}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#f5f5f5}#root{min-height:100vh}