/* ===============================================
   PCC Yield Optimizer - Loading States & Skeletons
   Sprint 7 - Phase 1
   =============================================== */

/* ===========================
   Skeleton Loader Base Styles
   =========================== */

.skeleton-loader {
  background: linear-gradient(90deg, var(--color-gray-100) 25%, var(--color-gray-200) 50%, var(--color-gray-100) 75%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
}

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

/* Loading message */
.loading-message {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-2xl);
  color: var(--color-text-secondary);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
}

.loading-message::before {
  content: '';
  width: var(--space-xl);
  height: var(--space-xl);
  border: var(--space-3xs) solid var(--color-gray-200);
  border-top-color: var(--color-brand-blue);
  border-radius: var(--radius-full);
  animation: spinner-rotate 0.8s linear infinite;
}

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

/* ===========================
   Heatmap Skeleton
   =========================== */

.heatmap-skeleton {
  display: grid;
  grid-template-columns: auto repeat(24, 1fr);
  gap: var(--space-3xs);
  padding: var(--space-xl);
}

.heatmap-skeleton-cell {
  width: 100%;
  height: var(--space-4xl);
  background: linear-gradient(90deg, var(--color-gray-100) 25%, var(--color-gray-200) 50%, var(--color-gray-100) 75%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

/* Stagger animation for visual effect */
.heatmap-skeleton-cell:nth-child(even) {
  animation-delay: 0.1s;
}

.heatmap-skeleton-cell:nth-child(3n) {
  animation-delay: 0.2s;
}

/* ===========================
   Opportunity Card Skeleton
   =========================== */

.opportunity-skeleton {
  background: var(--color-white);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.opportunity-skeleton-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.opportunity-skeleton-title {
  height: var(--space-2xl);
  width: 60%;
  background: linear-gradient(90deg, var(--color-gray-100) 25%, var(--color-gray-200) 50%, var(--color-gray-100) 75%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.opportunity-skeleton-score {
  height: var(--space-5xl);
  width: var(--space-5xl);
  background: linear-gradient(90deg, var(--color-gray-100) 25%, var(--color-gray-200) 50%, var(--color-gray-100) 75%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-full);
}

.opportunity-skeleton-details {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.opportunity-skeleton-line {
  height: var(--space-lg);
  background: linear-gradient(90deg, var(--color-gray-100) 25%, var(--color-gray-200) 50%, var(--color-gray-100) 75%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.opportunity-skeleton-line:nth-child(1) {
  width: 80%;
}

.opportunity-skeleton-line:nth-child(2) {
  width: 65%;
}

.opportunity-skeleton-line:nth-child(3) {
  width: 75%;
}

/* Stagger card animations */
.opportunity-skeleton:nth-child(1) {
  animation: skeleton-fade-in 0.3s ease-out;
}

.opportunity-skeleton:nth-child(2) {
  animation: skeleton-fade-in 0.3s ease-out 0.05s both;
}

.opportunity-skeleton:nth-child(3) {
  animation: skeleton-fade-in 0.3s ease-out 0.1s both;
}

.opportunity-skeleton:nth-child(4) {
  animation: skeleton-fade-in 0.3s ease-out 0.15s both;
}

.opportunity-skeleton:nth-child(5) {
  animation: skeleton-fade-in 0.3s ease-out 0.2s both;
}

@keyframes skeleton-fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===========================
   Gap Analysis Grid Skeleton
   =========================== */

.gap-grid-skeleton {
  width: 100%;
  border-collapse: collapse;
}

.gap-grid-skeleton thead {
  background: var(--color-gray-50);
}

.gap-grid-skeleton th {
  padding: var(--space-md);
  text-align: left;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-body-sm);
  color: var(--color-gray-700);
  border-bottom: var(--space-3xs) solid var(--color-border-default);
}

.gap-grid-skeleton-row {
  border-bottom: 1px solid var(--color-border-default);
}

.gap-grid-skeleton-cell {
  padding: var(--space-md);
  height: var(--space-5xl);
}

.gap-grid-skeleton-bar {
  height: var(--font-size-h3);
  background: linear-gradient(90deg, var(--color-gray-100) 25%, var(--color-gray-200) 50%, var(--color-gray-100) 75%);
  background-size: 200% 100%;
  animation: skeleton-pulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.gap-grid-skeleton-bar.short {
  width: 60%;
}

.gap-grid-skeleton-bar.medium {
  width: 75%;
}

.gap-grid-skeleton-bar.long {
  width: 90%;
}

/* ===========================
   Map Loading Overlay
   =========================== */

.map-loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  z-index: 1000;
  transition: opacity 0.3s ease-out;
}

.map-loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.map-loading-spinner {
  width: var(--space-4xl);
  height: var(--space-4xl);
  border: var(--space-2xs) solid var(--color-gray-200);
  border-top-color: var(--color-brand-blue);
  border-radius: var(--radius-full);
  animation: spinner-rotate 0.8s linear infinite;
}

.map-loading-text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
}

/* ===========================
   Component Loading States
   =========================== */

/* Hide real content while loading */
[data-loading="true"] .heatmap-grid,
[data-loading="true"] .opportunity-card,
[data-loading="true"] .gap-analysis-table {
  display: none;
}

/* Show skeleton while loading */
[data-loading="true"] .skeleton-container {
  display: block;
}

[data-loading="false"] .skeleton-container {
  display: none;
}

/* Fade in real content */
[data-loading="false"] .heatmap-grid,
[data-loading="false"] .opportunity-card,
[data-loading="false"] .gap-analysis-table {
  animation: content-fade-in 0.4s ease-out;
}

@keyframes content-fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ===========================
   Spinner Utility Classes
   =========================== */

.spinner {
  display: inline-block;
  width: var(--space-lg);
  height: var(--space-lg);
  border: var(--space-3xs) solid currentColor;
  border-top-color: transparent;
  border-radius: var(--radius-full);
  animation: spinner-rotate 0.6s linear infinite;
  vertical-align: middle;
}

.spinner.sm {
  width: var(--space-md);
  height: var(--space-md);
  border-width: 1.5px;
}

.spinner.lg {
  width: var(--space-2xl);
  height: var(--space-2xl);
  border-width: 3px;
}

/* Button with spinner */
.btn-loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
  cursor: default;
}

.btn-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: var(--space-lg);
  height: var(--space-lg);
  border: var(--space-3xs) solid var(--color-white);
  border-top-color: transparent;
  border-radius: var(--radius-full);
  animation: spinner-rotate 0.6s linear infinite;
}

.btn-secondary.btn-loading::after {
  border-color: var(--color-brand-blue);
  border-top-color: transparent;
}

/* ===========================
   Loading Container
   =========================== */

.loading-container {
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: var(--space-lg);
  padding: var(--space-4xl);
}

.loading-container-icon {
  width: var(--space-5xl);
  height: var(--space-5xl);
  border: var(--space-2xs) solid var(--color-gray-200);
  border-top-color: var(--color-brand-blue);
  border-radius: var(--radius-full);
  animation: spinner-rotate 0.8s linear infinite;
}

.loading-container-text {
  color: var(--color-text-secondary);
  font-size: var(--font-size-body-lg);
  font-weight: var(--font-weight-medium);
  text-align: center;
}

.loading-container-subtext {
  color: var(--color-gray-500);
  font-size: var(--font-size-body-sm);
  text-align: center;
  max-width: 400px;
}