cv-site/static/css/skeleton.css

/**
 * Component-Level Skeleton Loaders for Language Transitions
 * ==========================================================
 * Each CV component has dual-state structure:
 * - .actual-content (real CV content)
 * - .skeleton-content (gray pulsing placeholders)
 *
 * Loading state controlled via .loading class on component wrapper
 */

/* ========================================================================
   BASE SKELETON STYLES
   ======================================================================== */

.skeleton {
  background: linear-gradient(
    90deg,
    #f0f0f0 0%,
    #e8e8e8 20%,
    #f0f0f0 40%,
    #f0f0f0 100%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.8s ease-in-out infinite;
  border-radius: 4px;
  will-change: background-position;
}

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

/* ========================================================================
   COMPONENT WRAPPER STATE TOGGLING
   ======================================================================== */

/* Default state: Show actual content, hide skeleton */
.component-wrapper {
  position: relative;
}

.component-wrapper .actual-content {
  opacity: 1;
  transition: opacity 250ms ease-out;
}

.component-wrapper .skeleton-content {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 250ms ease-out;
}

/* Loading state: Hide actual content, show skeleton */
.component-wrapper.loading .actual-content {
  opacity: 0;
  pointer-events: none;
}

.component-wrapper.loading .skeleton-content {
  opacity: 1;
  pointer-events: all;
}

/* ========================================================================
   SKELETON SHAPE DEFINITIONS
   ======================================================================== */

/* Header Section Skeleton */
.skeleton-header {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.skeleton-header-text {
  flex: 1;
}

.skeleton-name {
  height: 32px;
  width: 70%;
  margin-bottom: 8px;
}

.skeleton-experience-years {
  height: 20px;
  width: 50%;
  margin-bottom: 16px;
}

.skeleton-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  flex-shrink: 0;
}

.skeleton-intro {
  height: 60px;
  width: 100%;
  margin-top: 12px;
}

/* Section Title Skeleton */
.skeleton-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
}

.skeleton-icon {
  width: 24px;
  height: 24px;
  border-radius: 4px;
  flex-shrink: 0;
}

.skeleton-title-text {
  height: 24px;
  width: 40%;
}

/* Skill Item Skeleton (Sidebar) */
.skeleton-skill-category {
  margin-bottom: 20px;
}

.skeleton-skill-title {
  height: 20px;
  width: 60%;
  margin-bottom: 12px;
}

.skeleton-skill-items {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.skeleton-skill-item {
  height: 32px;
  width: 100%;
}

.skeleton-skill-item:nth-child(2) {
  width: 85%;
}

.skeleton-skill-item:nth-child(3) {
  width: 90%;
}

.skeleton-skill-item:nth-child(4) {
  width: 75%;
}

/* Experience Entry Skeleton */
.skeleton-experience-item {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

.skeleton-company-logo {
  width: 60px;
  height: 60px;
  border-radius: 8px;
  flex-shrink: 0;
}

.skeleton-experience-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.skeleton-position {
  height: 20px;
  width: 80%;
}

.skeleton-company-info {
  height: 16px;
  width: 60%;
}

.skeleton-description {
  height: 40px;
  width: 100%;
  margin-top: 4px;
}

.skeleton-description.short {
  width: 85%;
}

/* Education Item Skeleton */
.skeleton-education-item {
  margin-bottom: 16px;
}

.skeleton-degree {
  height: 18px;
  width: 75%;
  margin-bottom: 6px;
}

.skeleton-institution {
  height: 16px;
  width: 50%;
}

/* Text Block Skeletons (Generic) */
.skeleton-text {
  height: 16px;
  margin-bottom: 8px;
}

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

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

.skeleton-text.long {
  width: 95%;
}

/* ========================================================================
   RESPONSIVE ADJUSTMENTS
   ======================================================================== */

@media (max-width: 768px) {
  .skeleton-header {
    flex-direction: column;
    align-items: center;
  }

  .skeleton-header-text {
    text-align: center;
    width: 100%;
  }

  .skeleton-name,
  .skeleton-experience-years {
    width: 80%;
    margin-left: auto;
    margin-right: auto;
  }

  .skeleton-photo {
    width: 100px;
    height: 100px;
  }

  .skeleton-experience-item {
    flex-direction: column;
    gap: 12px;
  }

  .skeleton-company-logo {
    width: 50px;
    height: 50px;
  }
}

/* ========================================================================
   ACCESSIBILITY - REDUCED MOTION
   ======================================================================== */

@media (prefers-reduced-motion: reduce) {
  .skeleton {
    animation: none;
    background: #e8e8e8;
  }

  .component-wrapper .actual-content,
  .component-wrapper .skeleton-content {
    transition: none;
  }
}

/* ========================================================================
   PRINT STYLES
   ======================================================================== */

@media print {
  .skeleton-content {
    display: none !important;
  }

  .component-wrapper .actual-content {
    opacity: 1 !important;
  }
}

/* ========================================================================
   PERFORMANCE OPTIMIZATIONS
   ======================================================================== */

/* Force GPU acceleration for skeleton elements */
.skeleton {
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* Contain layout/paint/style to prevent reflow */
.component-wrapper {
  contain: layout style;
}

/* Optimize skeleton rendering */
.skeleton-content {
  contain: layout paint;
}