body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:#f4f7f9;color:#333}.app-container{display:flex;flex-direction:column;min-height:100vh}.main-content{flex:1;max-width:1100px;width:100%;margin:2rem auto;padding:0 1rem;box-sizing:border-box}