body{font-family: Arial, Helvetica, sans-serif; margin:0; padding:0; background:#f5f7fa}
.container{max-width:900px;margin:20px auto;padding:16px;background:#fff;border-radius:8px;box-shadow:0 2px 6px rgba(0,0,0,0.06)}
.topbar{display:flex;justify-content:space-between;padding:8px 16px;background:#111;color:#fff}
label{display:block;margin:8px 0}
input,button,select{padding:8px;margin-top:4px;width:100%;box-sizing:border-box}
button{background:#1572e8;color:#fff;border:none;border-radius:6px}
table{width:100%;border-collapse:collapse;margin-top:8px}
th,td{padding:8px;border-bottom:1px solid #eee;text-align:left}
.error{color:#a00;background:#fee;padding:8px;border-radius:6px}