/*contact*/
 body {
      font-family: 'Roboto', sans-serif;
      background: linear-gradient( 120deg,#eef0f1, #6c6ccd, #09254d);
      margin: 0;
      padding: 0;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }
    .IMG {
      text-align: left;
      }
      
    .contact-box {
      background: #35aecc;
      padding: 40px;
      border-radius: 15px;
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
      width: 600px;
      max-width: 90%;
      margin: auto;
      /* căn giữa theo chiều dọc */
    }

    .contact-box h2 {
      text-align: center;
      margin-bottom: 25px;
      font-size: 26px;
      color: #2c3e50;
    }

    form {
      display: flex;
      flex-direction: column;
    }

    label {
      font-size: 15px;
      margin-bottom: 6px;
      font-weight: 500;
      color: #34495e;
    }

    input,
    textarea {
      margin-bottom: 18px;
      padding: 14px;
      border: 1px solid #cccc;
      border-radius: 8px;
      font-size: 15px;
      outline: none;
      transition: all 0.3s;
    }

    input:focus,
    textarea:focus {
      border: 1px solid #2980b9;
      box-shadow: 0 0 6px rgba(41, 128, 185, 0.3);
    }

    textarea {
      resize: none;
    }

    .btn {
      padding: 14px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      font-size: 16px;
      font-weight: 500;
      margin-top: 5px;
      transition: 0.3s;
    }

    .btn-submit {
      background: #2980b9;
      color: #f1f4f5;
    }

    .btn-submit:hover {
      background: #1f6391;
    }

    .btn-home {
      background: #27ae60;
      color: #fff;
      text-align: center;
      text-decoration: none;
      display: block;
    }

    .btn-home:hover {
      background: #1e874b;
    }

    footer {
      background: #2c3e50;
      color: #ecf0f1;
      text-align: center;
      padding: 12px 0;
      font-size: 14px;
      margin-top: auto;
      /* đẩy footer xuống đáy */
    }

    footer p {
      margin: 4px 0;
    }