/* Critical CSS for Performance Optimization */

/* Above-the-fold critical styles */
:root {
    /* Performance-optimized color variables */
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --background-color: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
}

/* Critical layout styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
}

/* Navigation critical styles */
.navigation {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

/* Hero section critical styles */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
}

/* Performance optimizations */
.lazy-load {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.lazy-load.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* Reduce layout shifts */
.aspect-ratio-16-9 {
    aspect-ratio: 16 / 9;
}

.aspect-ratio-1-1 {
    aspect-ratio: 1 / 1;
}

/* Optimize font loading */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400;
    font-display: swap;
    src: url('https://fonts.gstatic.com/s/inter/v12/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hiA.woff2') format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* Critical button styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #1d4ed8;
    transform: translateY(-1px);
}

/* Optimize images */
img {
    max-width: 100%;
    height: auto;
    loading: lazy;
}

/* Reduce CLS for dynamic content */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 1.5s infinite;
}

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

/* Mobile-first responsive design */
@media (max-width: 768px) {
    .hero {
        padding: 2rem 1rem;
        text-align: center;
    }
    
    .navigation {
        padding: 0.5rem 1rem;
    }
}

/* Preload critical resources */
.preload-critical {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
}

/* Optimize animations for performance */
.smooth-animation {
    will-change: transform, opacity;
    transform: translateZ(0);
}

/* Reduce paint complexity */
.optimized-shadow {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

/* Critical utility classes */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Performance monitoring */
.performance-marker {
    display: none;
}

/* Dark mode support with minimal impact */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #0f172a;
        --text-color: #f1f5f9;
        --border-color: #334155;
    }
}