/* พื้นหลังมืดของ modal */
#introModal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

/* กล่องเนื้อหา */
#introModal .modal-content {
  position: relative;
  background: #fff;
  border: 3px solid #0073aa;
  border-radius: 20px;
  padding: 30px 25px 40px;
  text-align: center;
  width: 90%;
  /*max-width: 600px;*/
  text-align: center;
  box-shadow: 0 8px 30px rgba(0,0,0,0.25);
  animation: fadeIn 0.4s ease;
  overflow: hidden;
}

@keyframes fadeIn {
  from {opacity: 0; transform: scale(0.95);}
  to {opacity: 1; transform: scale(1);}
}

/* ปุ่มปิด */
#closeIntroModal {
  margin-top: 15px;
  background: #0073aa;
  color: #fff;
  padding: 10px 25px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}
#closeIntroModal:hover {
  background: #005f8c;
}