/* Performance and loading styles */
.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.3s ease-out;
}

.page-loader.loaded {
    opacity: 0;
    pointer-events: none;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #3498db;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Lazy loading images */
img[data-src] {
    opacity: 0;
    transition: opacity 0.3s ease-in;
}

img.loaded {
    opacity: 1;
}

/* Image placeholders */
.img-placeholder {
    background: #f0f0f0;
    position: relative;
    overflow: hidden;
}

.img-placeholder::before {
    content: '';
    display: block;
    padding-top: 75%;
}

/* Optimize image display */
img {
    max-width: 100%;
    height: auto;
    display: block;
}