/* ============================================
   CENTRALIZED LOADING SYSTEM CSS
   Professional loading indicators, skeletons, and states
   ============================================ */

/* ============================================
   PAGE LOADER (Fullscreen)
   ============================================ */
.page-loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-main, #ffffff);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
    visibility 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

.page-loader.active {
  display: flex;
  opacity: 1;
  visibility: visible;
  pointer-events: all;
}

.page-loader-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
}

.page-loader-spinner {
  position: relative;
  width: 64px;
  height: 64px;
}

.spinner-ring {
  display: inline-block;
  position: relative;
  width: 64px;
  height: 64px;
}

.spinner-ring div {
  box-sizing: border-box;
  display: block;
  position: absolute;
  width: 51.2px;
  height: 51.2px;
  margin: 6.4px;
  border: 5.12px solid transparent;
  border-top-color: var(--primary, #3454d1);
  border-radius: 50%;
  animation: spinner-rotate 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

.spinner-ring div:nth-child(1) {
  animation-delay: -0.45s;
}

.spinner-ring div:nth-child(2) {
  animation-delay: -0.3s;
}

.spinner-ring div:nth-child(3) {
  animation-delay: -0.15s;
}

@keyframes spinner-rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

.page-loader-text {
  font-family: var(--font-family, "Manrope", sans-serif);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-main, #283c50);
  letter-spacing: 0.025em;
  animation: loader-text-pulse 2s ease-in-out infinite;
}

@keyframes loader-text-pulse {
  0%,
  100% {
    opacity: 0.6;
  }
  50% {
    opacity: 1;
  }
}

/* ============================================
   INLINE LOADER (Buttons, Cards)
   ============================================ */
.inline-loader {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.inline-loader.loader-sm .spinner-border-sm {
  width: 0.875rem;
  height: 0.875rem;
  border-width: 0.15em;
}

.inline-loader.loader-md .spinner-border-sm {
  width: 1rem;
  height: 1rem;
  border-width: 0.2em;
}

.inline-loader.loader-lg .spinner-border-sm {
  width: 1.25rem;
  height: 1.25rem;
  border-width: 0.25em;
}

.inline-loader.loader-primary .spinner-border-sm {
  border-color: var(--primary, #3454d1);
  border-right-color: transparent;
}

.inline-loader.loader-secondary .spinner-border-sm {
  border-color: var(--secondary, #6c757d);
  border-right-color: transparent;
}

.inline-loader.loader-white .spinner-border-sm {
  border-color: #ffffff;
  border-right-color: transparent;
}

/* ============================================
   SKELETON LOADERS
   ============================================ */
.skeleton-loader-tbody {
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

.skeleton-row {
  border-bottom: 1px solid var(--border-color, #dcdee4);
}

.skeleton-cell {
  padding: 1rem;
  vertical-align: middle;
}

.skeleton-shimmer {
  background: linear-gradient(
    90deg,
    var(--bg-card, #ffffff) 0%,
    var(--bg-page, #f3f4f6) 50%,
    var(--bg-card, #ffffff) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: 4px;
  height: 1rem;
}

.skeleton-card {
  padding: 1.5rem;
  background: var(--bg-card, #ffffff);
  border: 1px solid var(--border-color, #dcdee4);
  border-radius: var(--radius-lg, 12px);
  margin-bottom: 1rem;
}

.skeleton-header {
  margin-bottom: 1rem;
}

.skeleton-title {
  height: 1.5rem;
  width: 60%;
  margin-bottom: 0.5rem;
}

.skeleton-subtitle {
  height: 1rem;
  width: 40%;
}

.skeleton-body {
  margin-top: 1rem;
}

.skeleton-line {
  height: 0.875rem;
  width: 100%;
  margin-bottom: 0.75rem;
}

.skeleton-line-short {
  width: 70%;
}

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

@keyframes skeleton-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted, #6b7885);
}

.empty-state-icon {
  font-size: 4rem;
  color: var(--text-muted, #6b7885);
  opacity: 0.3;
  margin-bottom: 1.5rem;
}

.empty-state-icon i {
  display: inline-block;
}

.empty-state-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main, #283c50);
  margin-bottom: 0.75rem;
}

.empty-state-message {
  font-size: 1rem;
  color: var(--text-muted, #6b7885);
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ============================================
   ERROR STATE
   ============================================ */
.error-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted, #6b7885);
}

.error-state-icon {
  font-size: 4rem;
  color: var(--danger, #ea4d4d);
  opacity: 0.8;
  margin-bottom: 1.5rem;
}

.error-state-icon i {
  display: inline-block;
}

.error-state-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main, #283c50);
  margin-bottom: 0.75rem;
}

.error-state-message {
  font-size: 1rem;
  color: var(--text-muted, #6b7885);
  max-width: 500px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ============================================
   DARK MODE SUPPORT
   ============================================ */
.app-skin-dark .page-loader,
.dark-theme .page-loader {
  background: var(--bg-main, #1a1d29) !important;
}

.app-skin-dark .page-loader-text,
.dark-theme .page-loader-text {
  color: var(--text-main, #e4e6eb) !important;
}

.app-skin-dark .spinner-ring div,
.dark-theme .spinner-ring div {
  border-top-color: var(--primary, #4a9fd4) !important;
}

.app-skin-dark .skeleton-shimmer,
.dark-theme .skeleton-shimmer {
  background: linear-gradient(
    90deg,
    var(--bg-card, #252836) 0%,
    var(--bg-page, #1f2332) 50%,
    var(--bg-card, #252836) 100%
  );
  background-size: 200% 100%;
}

.app-skin-dark .skeleton-card,
.dark-theme .skeleton-card {
  background: var(--bg-card, #252836);
  border-color: var(--border-color, #2d3142);
}

.app-skin-dark .empty-state,
.dark-theme .empty-state {
  color: var(--text-muted, #9ca3af);
}

.app-skin-dark .empty-state-title,
.dark-theme .empty-state-title {
  color: var(--text-main, #e4e6eb);
}

.app-skin-dark .empty-state-message,
.dark-theme .empty-state-message {
  color: var(--text-muted, #9ca3af);
}

.app-skin-dark .empty-state-icon,
.dark-theme .empty-state-icon {
  color: var(--text-muted, #6b7885);
  opacity: 0.5;
}

.app-skin-dark .error-state-title,
.dark-theme .error-state-title {
  color: var(--text-main, #e4e6eb);
}

.app-skin-dark .error-state-message,
.dark-theme .error-state-message {
  color: var(--text-muted, #9ca3af);
}

.app-skin-dark .error-state-icon,
.dark-theme .error-state-icon {
  color: var(--danger, #f07575);
  opacity: 0.9;
}

.app-skin-dark .inline-loader.loader-primary .spinner-border-sm,
.dark-theme .inline-loader.loader-primary .spinner-border-sm {
  border-color: var(--primary, #4a9fd4);
  border-right-color: transparent;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .page-loader-spinner {
    width: 48px;
    height: 48px;
  }

  .spinner-ring {
    width: 48px;
    height: 48px;
  }

  .spinner-ring div {
    width: 38.4px;
    height: 38.4px;
    margin: 4.8px;
    border-width: 3.84px;
  }

  .empty-state-icon,
  .error-state-icon {
    font-size: 3rem;
  }

  .empty-state-title,
  .error-state-title {
    font-size: 1.25rem;
  }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .spinner-ring div,
  .skeleton-shimmer,
  .skeleton-loader-tbody,
  .page-loader-text {
    animation: none !important;
  }

  .skeleton-shimmer {
    opacity: 0.7;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
  .page-loader,
  .inline-loader,
  .skeleton-loader-tbody,
  .skeleton-card {
    display: none !important;
  }
}