/* ===== SKELETON LOADING STYLES ===== */

.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* Image skeleton placeholders */
.image-skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 8px;
  position: relative;
  overflow: hidden;
}

.image-skeleton::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" fill="%23ccc" viewBox="0 0 24 24"><path d="M21 19V5c0-1.1-.9-2-2-2H5c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h14c1.1 0 2-.9 2-2zM8.5 13.5l2.5 3.01L14.5 12l4.5 6H5l3.5-4.5z"/></svg>') center/contain no-repeat;
  opacity: 0.3;
}

/* Text skeleton placeholders */
.text-skeleton {
  height: 1.2em;
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 4px;
  margin: 8px 0;
}

.text-skeleton.short {
  width: 60%;
}

.text-skeleton.medium {
  width: 80%;
}

.text-skeleton.long {
  width: 100%;
}

/* ===== FORM LOADING INDICATORS ===== */

/* Loading spinner */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 1s ease-in-out infinite;
  margin-right: 8px;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Button loading state */
.btn-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
  cursor: not-allowed;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid transparent;
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Form field loading state */
.form-field-loading {
  position: relative;
}

.form-field-loading::after {
  content: '';
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  border: 2px solid #e0e0e0;
  border-top-color: #007bff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ===== LAZY LOADING FADE-IN ===== */

.fade-in {
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}

.fade-in.loaded {
  opacity: 1;
}

/* Image loading with blur-up effect */
.blur-up {
  filter: blur(5px);
  transition: filter 0.3s ease-in-out;
}

.blur-up.loaded {
  filter: blur(0);
}

/* ===== LOADING OVERLAY ===== */

.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  border-radius: inherit;
}

.loading-overlay.dark {
  background: rgba(0, 0, 0, 0.5);
}

/* ===== RESPONSIVE LOADING STATES ===== */

@media (max-width: 768px) {
  .loading-spinner {
    width: 16px;
    height: 16px;
  }
  
  .image-skeleton::before {
    width: 30px;
    height: 30px;
  }
}