/**
 * Header Performance Optimizations
 * Additional CSS to prevent layout shift and improve PageSpeed
 * Works with existing main.css
 */

/* Prevent Layout Shift - Force Header Dimensions */
.df-header {
    min-height: 86px;
    background: white;
    position: sticky;
    top: 0;
    z-index: 10;
    /* Убираем contain и transform для корректной работы dropdown */
    overflow: visible;
}

.df-header.scrolled {
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* Logo Optimization */
.df-header .df-logo img {
    width: 219px;
    height: 53px;
    aspect-ratio: 219/53;
    object-fit: contain;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    contain: size layout style;
    display: block;
}

/* Button Optimization */
.df-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 56px;
    min-height: 56px;
    padding: 0 30px;
    border: 0;
    border-radius: 4px;
    font-size: 16px;
    font-weight: bold;
    text-decoration: none;
    white-space: nowrap;
}

/* Button Colors */
.df-btn-grey {
    background-color: rgb(240, 240, 239);
    color: rgb(56, 61, 61);
}

.df-btn-green {
    background-color: rgb(3, 129, 129);
    color: white;
}

/* Fix UIKit Grid Button Container Height */
.df-login,
.df-signup {
    height: 56px;
    display: flex;
    align-items: center;
}

.df-login .df-button,
.df-signup .df-button {
    height: 56px !important;
    min-height: 56px !important;
    box-sizing: border-box;
}

/* Mega Menu Images */
.df-mega-menu .uk-dropdown img,
.df-mega-menu .uk-drop img {
    loading: lazy;
    decoding: async;
}

/* Navigation Optimization */
.df-nav ul {
    display: flex;
    gap: 30px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.df-nav ul li {
    padding: 15px 0;
}

/* Mobile Menu Performance - Удаляем дублирующие стили, оставляем main.css управлять hamburger */

/* Font Loading Optimization */
.df-header * {
    font-display: swap;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Reduce Paints on Scroll - убираем свойства которые могут обрезать dropdown */
.df-header {
    /* backface-visibility: hidden; - убираем, может обрезать dropdown */
    /* perspective: 1000px; - убираем, может влиять на positioning */
}

/* Dropdown Animation Performance */
.uk-dropdown {
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), 
                transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translate3d(0, 0, 0);
}

/* Memory Optimization */
.df-header *:not(.uk-dropdown) {
    will-change: auto;
}

/* Reduce Motion for Performance */
@media (prefers-reduced-motion: reduce) {
    .df-header *,
    .uk-dropdown {
        transition: none !important;
        animation: none !important;
    }
}

/* Critical Resource Hints */
.df-logo img {
    loading: eager;
    fetchpriority: high;
}

/* Container Stability */
.df-header .uk-container {
    position: relative;
    width: 100%;
    max-width: 1360px;
    box-sizing: border-box;
    display: flex;
    align-items: center;
}

/* Prevent Flash of Unstyled Content */
.df-header {
    opacity: 1 !important;
    visibility: visible !important;
}

/* Hardware Acceleration for Smooth Performance - Убираем transform для dropdown и hamburger */