body {
    font-family: 'Segoe UI', sans-serif;
    background: #f4f7fa;
    color: #333;
    margin: 0;
    padding: 20px;
  }
.logo img {
  width: 30%;
  height: auto;
  display: block;
  margin: 0 auto 20px;
}

  .container {
    width: 80%;
    margin: auto;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    padding: 30px;
    border-left: 8px solid #00a6ff; /* Xanh dương */
  }

  h2 {
    color: #0077cc;
    margin-bottom: 20px;
  }

  .form-group {
    margin-bottom: 20px;
  }

  label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    color: #333;
  }

  input[type="text"],
  select,
  textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ccc;
    border-radius: 8px;
    box-sizing: border-box;
    transition: border 0.3s;
    font-size: 15px;
  }

  input:focus,
  select:focus,
  textarea:focus {
    border-color: #00a6ff; /* Xanh dương */
    outline: none;
  }

  textarea {
    min-height: 80px;
    resize: vertical;
  }

  #submitBtn {
    background: linear-gradient(45deg, #00a6ff, #00cc66); /* Xanh dương -> Xanh lá */
    color: white;
    padding: 12px 24px;
    font-weight: bold;
    font-size: 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.3s ease;
  }

  #submitBtn:hover {
    background: linear-gradient(45deg, #00cc66, #ff9900); /* Xanh lá -> Cam */
  }

  .don-hang {
    color: #ff6600; /* Cam */
    font-size: 18px;
    margin-top: 30px;
  }

  .form-group p {
    margin: 6px 0;
    font-size: 15px;
    color: #444;
    display: flex;
  }

  /* Responsive */
  @media (max-width: 768px) {
    .container {
      padding: 20px;
    }

    #submitBtn {
      width: 100%;
    }
  }