*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:#f5f7fa}.app-header{display:flex;align-items:center;justify-content:space-between;padding:0 24px;background:#001529;color:#fff}.app-header .brand{font-size:18px;font-weight:600}.app-content{padding:24px;max-width:1200px;margin:0 auto}.login-card{max-width:400px;margin:80px auto}