body { background: #eee; font-family: sans-serif; display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; }
.login-box { background: #fff; padding: 30px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.1); width: 300px; }
.login-box h2 { margin: 0 0 20px; text-align: center; color: #333; font-size: 18px; }
.login-box input[type=text],
.login-box input[type=password] { width: 100%; padding: 10px; margin-bottom: 12px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; font-size: 14px; }
.login-box input[type=submit] { width: 100%; padding: 10px; background: #4a90d9; color: #fff; border: none; border-radius: 4px; cursor: pointer; font-size: 14px; }
.login-box input[type=submit]:hover { background: #357abd; }
.error { color: #c00; font-size: 13px; margin-bottom: 10px; text-align: center; }