*{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif}#app{width:100%;height:100%}.app-layout{width:100%;height:100vh;display:flex}.app-sidebar{background-color:#304156;width:250px;height:100%;transition:width .3s;overflow-y:auto}.app-main{flex-direction:column;flex:1;display:flex;overflow:hidden}.app-header{background-color:#fff;border-bottom:1px solid #e4e7ed;justify-content:space-between;align-items:center;height:60px;padding:0 20px;display:flex}.app-content{background-color:#f0f2f5;flex:1;padding:20px;overflow-y:auto}.welcome-card{text-align:center;max-width:600px;margin:100px auto}