body {
      font-family: Arial, sans-serif;
      background: #f7f7f7;
      margin-top: 10px;
    }
    .wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      flex-wrap: wrap;
    }
    .prog_container {
      display: flex;
      width: 100%;
      gap: 30px;
      justify-content: center;
      padding: 30px 0;
    }
    form {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      margin: 10px 0;
    }
    .results {
      display: flex;
      flex-direction: column;
      flex-wrap: wrap;
      align-items: flex-start;
      font-size: 20px;
    }
    input[type="number"] {
      width: 60px;
      padding: 6px;
      margin-right: 10px;
      font-size: 14px;
    }
    label {
      margin-right: 15px;
      font-size: 14px;
    }
    #controls {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    button {
      padding: 8px 14px;
      margin-right: 6px;
      font-size: 14px;
      cursor: pointer;
    }

    #stepLabel {
      font-weight: bold;
    }

    #grid {
      display: grid;
      grid-template-columns: repeat(7, 50px);
      gap: 4px;
    }

    .cell {
      width: 50px;
      height: 50px;
      border-radius: 6px;
      border: 1px solid #bbb;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      background-color: white;
      transition: background-color 0.4s;
    }

    .start {
      background: #4caf50 !important;
      color: white;
    }

    .end {
      background: #f44336 !important;
      color: white;
    }

    .must {
      background: #ffeb3b !important;
      color: black;
    }
    #result {
      font-size: 32px;
      font-weight: bold;
    }