/* 
 * CSS untuk lazy loading elements
 * Mengoptimalkan Core Web Vitals dengan menunda render non-critical elements
 */

/* Default state untuk lazy-loaded images */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s ease;
}

/* State ketika gambar selesai dimuat */
img[loading="lazy"].loaded {
    opacity: 1;
}

/* Placeholder styling untuk gambar yang belum dimuat */
.lazy-placeholder {
    background: linear-gradient(135deg, #f5f5f5 25%, #e0e0e0 50%, #f5f5f5 75%);
    background-size: 200% 200%;
    animation: shimmer 1.5s infinite;
    border-radius: 4px;
}

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

/* Lazy-load sections */
.lazy-section {
    min-height: 50vh;
    position: relative;
}

/* Lazy-load untuk iframe */
iframe[loading="lazy"] {
    background: #f5f5f5;
    border: none;
}

/* Lazy-load untuk komponen bawah fold */
.below-fold {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.below-fold.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* Lazy-load untuk font (FOUT strategy) */
body {
    font-display: swap;
}

/* Lazy-load untuk background images */
.lazy-bg {
    background-color: #f5f5f5;
    background-repeat: no-repeat;
    background-size: cover;
}

/* Animasi untuk skeleton loading */
.skeleton {
    animation: skeleton-loading 1s linear infinite alternate;
}

@keyframes skeleton-loading {
    0% { background-color: hsl(200, 20%, 80%); }
    100% { background-color: hsl(200, 20%, 95%); }
}

.skeleton-text {
    width: 100%;
    height: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 0.25rem;
}

.skeleton-image {
    width: 100%;
    height: 200px;
    border-radius: 0.25rem;
}

/* Critical CSS akan dimuat terlebih dahulu */
.critical {
    opacity: 1 !important;
    transform: none !important;
}