body { font-family: Arial; background:#f4f6f8; margin:0 }
header { background:#111;color:#fff;padding:15px;display:flex;justify-content:space-between }
.card { background:#fff;padding:20px;border-radius:8px }
.grid { display:grid;grid-template-columns:1fr 1fr;gap:20px;padding:20px }
table { width:100%;background:#fff;margin:20px;border-collapse:collapse }
td,th { padding:10px;border-bottom:1px solid #ddd }
.btn { display:block;padding:10px;background:#007bff;color:#fff;text-align:center;margin-bottom:10px }
.warn { background:#f39c12 }
.login { display:flex;justify-content:center;align-items:center;height:100vh }
.error { color:red }