If statement with array conditions in bash

This code is a part of the project that i'm currently doing. I want to add 26 into the minus value elements in the array. Here is the simple code that I wrote in bash, but the output is not changing and it showing command not found. can anyone help me please:

  declare -a B
  B[0]=5
  B[1]=-11
  B[2]=-14
  B[3]=25

  for((i=0; i<4; i++))do
      if [[ $B{[i]} < 0 ]]; then 
           B[$i] ="(( B[$i] + 26))"
      fi
  done
  echo ${B[@]}

Expected Output:

  5 15 12 25

But the actual output for my code:

  Line ##: B[1]: command not found
  Line ##: B[2]: command not found
  5 -11 -14 25