Projektarbeit-MYP/backend/static/css/caching-optimizations.css

/**
 * MYP Platform - CSS Caching-Optimierungen
 * Performance-optimierte Styles für besseres Caching und schnellere Ladezeiten
 */

/* ===== KRITISCHE ABOVE-THE-FOLD STYLES ===== */
/* Diese Styles sollten inline im HTML-Head geladen werden */
.critical-header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.critical-nav {
  display: flex;
  align-items: center;
  padding: 1rem;
  max-width: 1200px;
  margin: 0 auto;
}

.critical-logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: #0073ce;
}

.critical-main {
  min-height: 100vh;
  background: linear-gradient(135deg, #fafbfc 0%, #f5f7f9 100%);
}

/* ===== LAZY LOADING PLACEHOLDER ===== */
.lazy-placeholder {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite ease-in-out;
  border-radius: 4px;
}

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

.dark .lazy-placeholder {
  background: linear-gradient(90deg, #374151 25%, #4b5563 50%, #374151 75%);
  background-size: 200% 100%;
}

/* ===== PRELOAD HINTS ===== */
.preload-image {
  content-visibility: auto;
  contain-intrinsic-size: 300px 200px;
}

.preload-component {
  content-visibility: auto;
  contain-intrinsic-size: 100px;
}

/* ===== CACHE-OPTIMIERTE KOMPONENTEN ===== */
.cache-card {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(229, 231, 235, 0.5);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
  transition: transform 0.2s ease;
  contain: layout style paint;
}

.cache-card:hover {
  transform: translateY(-1px);
}

.cache-button {
  background: #0073ce;
  color: white;
  border: none;
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font-weight: 600;
  transition: background-color 0.2s ease;
  contain: layout style;
}

.cache-button:hover {
  background: #005a9f;
}

.cache-input {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(229, 231, 235, 0.8);
  border-radius: 4px;
  padding: 0.5rem;
  transition: border-color 0.2s ease;
  contain: layout style;
}

.cache-input:focus {
  outline: none;
  border-color: #0073ce;
  box-shadow: 0 0 0 2px rgba(0, 115, 206, 0.1);
}

/* ===== LAYOUT SHIFT PREVENTION ===== */
.prevent-cls {
  min-height: 200px; /* Prevent layout shift */
  contain: layout;
}

.image-container {
  aspect-ratio: 16/9;
  overflow: hidden;
  border-radius: 8px;
  background: #f3f4f6;
}

.image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.3s ease;
}

.image-container img[loading="lazy"] {
  opacity: 0;
}

.image-container img[loading="lazy"].loaded {
  opacity: 1;
}

/* ===== OPTIMIERTE TYPOGRAPHY ===== */
.text-heading {
  font-weight: 700;
  line-height: 1.2;
  color: #111827;
  contain: layout style;
}

.text-body {
  line-height: 1.6;
  color: #374151;
  contain: layout style;
}

.text-muted {
  color: #6b7280;
  contain: layout style;
}

/* ===== DARK MODE CACHE OPTIMIZATIONS ===== */
.dark .cache-card {
  background: rgba(30, 41, 59, 0.9);
  border-color: rgba(100, 116, 139, 0.3);
}

.dark .cache-input {
  background: rgba(30, 41, 59, 0.9);
  border-color: rgba(100, 116, 139, 0.5);
  color: #e2e8f0;
}

.dark .text-heading {
  color: #f8fafc;
}

.dark .text-body {
  color: #e2e8f0;
}

.dark .text-muted {
  color: #94a3b8;
}

.dark .image-container {
  background: #374151;
}

/* ===== RESPONSIVE OPTIMIZATIONS ===== */
@media (max-width: 768px) {
  .critical-nav {
    padding: 0.75rem;
  }
  
  .cache-card {
    padding: 0.75rem;
    margin-bottom: 0.75rem;
  }
  
  .cache-button {
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
  }
}

/* ===== PRINT OPTIMIZATIONS ===== */
@media print {
  .critical-header,
  .cache-button {
    display: none;
  }
  
  .cache-card {
    box-shadow: none;
    border: 1px solid #000;
    break-inside: avoid;
  }
}

/* ===== GPU ACCELERATION HINTS ===== */
.gpu-accelerated {
  transform: translateZ(0);
  will-change: transform;
}

/* ===== EFFICIENT ANIMATIONS ===== */
.fade-in-optimized {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.fade-in-optimized.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== CONTAINER QUERIES SUPPORT ===== */
@container (min-width: 300px) {
  .cache-card {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    align-items: center;
  }
}

/* ===== CONTENT VISIBILITY OPTIMIZATIONS ===== */
.auto-height {
  content-visibility: auto;
  contain-intrinsic-size: 0 200px;
}

.hidden-content {
  content-visibility: hidden;
}

/* ===== REDUCED MOTION PREFERENCES ===== */
@media (prefers-reduced-motion: reduce) {
  .fade-in-optimized,
  .cache-card,
  .cache-button,
  .cache-input {
    transition: none !important;
  }
  
  .lazy-placeholder {
    animation: none !important;
    background: #f0f0f0 !important;
  }
}

/* ===== HIGH CONTRAST MODE ===== */
@media (prefers-contrast: high) {
  .cache-card {
    border-width: 2px;
    border-color: #000;
  }
  
  .cache-button {
    border: 2px solid #000;
  }
  
  .cache-input {
    border-width: 2px;
    border-color: #000;
  }
}