/* =====================================================
   PERFORMANCE.CSS — niteshkrbhat.in
   Critical performance & rendering hints
   ===================================================== */

/* 1. Prevent CLS from images without explicit dimensions */
img {
    height: auto;
    max-width: 100%;
}

/* 2. Contain below-fold sections — deferred rendering
   Apply .below-fold to any section not visible on first load */
.below-fold {
    content-visibility: auto;
    contain-intrinsic-size: 0 600px;
}

/* 3. Smooth fade-in for lazy-loaded images */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.35s ease;
}
img[loading="lazy"].loaded {
    opacity: 1;
}

/* 4. Font-display: swap for custom @font-face rules
   (this empty rule is a reminder — add font-display:swap
   inside each @font-face block in your font files) */
@font-face {
    font-display: swap;
}

/* 5. Reduce motion for accessibility + perf */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* 6. GPU-accelerate hero video for smooth playback */
#videoBg,
#videoFg {
    transform: translateZ(0);
    will-change: transform;
    backface-visibility: hidden;
}

/* 7. table-bg optimisation hint (large PNG used as bg-image) */
[style*="table-bg.png"] {
    background-size: cover;
    background-attachment: scroll; /* avoid fixed — kills GPU compositing on mobile */
}

/* 8. Skeleton shimmer for lazy-loaded project thumbnails
   Removes the blank-box flash before images load */
.sa-work-portfolio-thumb img[loading="lazy"]:not(.loaded) {
    background: linear-gradient(90deg, #e8e8e8 25%, #f2f2f2 50%, #e8e8e8 75%);
    background-size: 200% 100%;
    animation: shimmer 1.4s infinite;
    min-height: 200px;
}
@keyframes shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}