:root {
      --primary-color: #0d6efd;
      --bg-light: #f4f6f8;
      --bg-white: #ffffff;
      --text-dark: #212529;
      --border-color: #dee2e6;
      --input-bg: #fff;
      --input-border: #ccc;
    }
   .container {
      max-width: 900px;
      margin: auto;
      background: #fff;
		  padding: 10px;
      margin-bottom: 30px;
    }

    h1 {
      text-align: center;
    
    }

    .grade-input-group {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      justify-content: space-between;
      margin-bottom: 30px;
    }

    .grade-box {
      flex: 1 1 30%;
      background: #f9fbfc;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 20px;
    }

    .grade-box h3 {
      text-align: center;
      color: var(--primary-color);
      margin-bottom: 20px;
    }

    .field {
      margin-bottom: 15px;
    }

    .field label {
      display: block;
      margin-bottom: 5px;
      font-weight: 600;
    }

    .field input[type="number"], .field input[readonly] {
      width: 100%;
      padding: 10px;
      border-radius: 5px;
      border: 1px solid var(--input-border);
      background: var(--input-bg);
      font-size: 1rem;
    }

    .buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
      justify-content: center;
      margin-bottom: 30px;
    }

    .buttons button {
      background:#3a6c9c;
      color: #fff;
      padding: 12px 24px;
      font-size: 1rem;
      font-weight: semi-bold;
      border: none;
      border-radius: 5px;
      cursor: pointer;
      transition: background 0.3s ease;
    }

    .buttons button:hover {
      background: #0b5ed7;
    }

    .result-section {
      text-align: center;
      font-size: 1.25rem;
      font-weight: 500;
      margin-bottom: 40px;
    }



    .blog p, .blog li {
      line-height: 1.6;
      margin-bottom: 10px;
    }

    @media (max-width: 768px) {
      .grade-box {
        flex: 1 1 100%;
      }
    }