*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:#f5f5f5}#app{min-height:100vh}.container{max-width:1200px;margin:0 auto}button{border:none;border-radius:4px;padding:8px 16px;font-size:14px;cursor:pointer;transition:all .2s}button:disabled{opacity:.6;cursor:not-allowed}