body { font-family: Arial, sans-serif; background: #f4f4f4; }
.container { width: 700px; margin: 30px auto; background: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 0 8px rgba(0,0,0,0.1); }
h2 { color: #333; }
table { width: 100%; border-collapse: collapse; margin-top: 10px; }
th, td { border: 1px solid #ddd; padding: 8px; text-align: left; }
input[type=text], input[type=password] { width: 100%; padding: 6px; margin: 6px 0; box-sizing: border-box; }
button { padding: 8px 12px; background: #4CAF50; border: none; color: white; border-radius: 4px; cursor: pointer; }
button:hover { opacity: 0.95; }
pre { background:#f9f9f9; padding:8px; border-radius:4px; overflow:auto; }
.error { color: red; }
.message { color: green; }