/* phủ toàn màn hình */
#preloader {
  position: fixed;
  inset: 0;
  background: #ffffff; /* hoặc gradient */
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999999;
  transition: opacity 0.8s ease; /* hiệu ứng fade-out */
}

/* khi load xong */
#preloader.hidden {
  opacity: 0;
  pointer-events: none;
}

/* nội dung loader */
.loader-content {
  text-align: center;
  color: #0e0e0e;
  font-family: sans-serif;
  animation: fadeIn 1s ease;
}

.loader-logo {
  width: 180px;
  height: auto;
  margin-bottom: 15px;
  animation: pulse 1.5s infinite;
}

.loader-text {
  font-size: 16px;
  letter-spacing: 2px;
  animation: blink 1.5s infinite;
}

/* hiệu ứng logo */
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.8; }
  50% { transform: scale(1.1); opacity: 1; }
}

/* hiệu ứng chữ */
@keyframes blink {
  0%, 100% { opacity: 0.7; }
  50% { opacity: 1; }
}

/* fade in khi hiện */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}