/* Enhanced Performance CSS - Fast & Smooth Website */

/* Critical Performance Optimizations */
:root {
    --primary-color: #0ea5e9;
    --primary-dark: #0284c7;
    --secondary-color: #1e293b;
    --accent-color: #f97316;
    --light-bg: #f8fafc;
    --dark-text: #475569;
    --border-color: #e2e8f0;
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 20px 40px rgba(0, 0, 0, 0.15);
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Super Smooth Scrolling */
html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    scroll-padding-top: 80px;
}

body {
    will-change: scroll-position;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: none;
    overflow-x: hidden;
}

/* Hardware Acceleration & GPU Optimization */
*, *::before, *::after {
    box-sizing: border-box;
}

.hw-accelerated {
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
    perspective: 1000px;
    will-change: transform;
}

/* Fast Loading & Optimization */
img {
    max-width: 100%;
    height: auto;
    loading: lazy;
    decode: async;
    image-rendering: optimizeQuality;
}

img[data-priority="high"] {
    loading: eager;
}

/* Enhanced Font Loading */
@font-face {
    font-family: 'Poppins';
    font-display: swap;
    src: local('Poppins');
}

.fast-text {
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    font-feature-settings: "kern" 1;
}

/* Modern Responsive Typography */
.responsive-text-sm { font-size: clamp(0.875rem, 2.5vw, 1rem); line-height: 1.6; }
.responsive-text-base { font-size: clamp(1rem, 2.5vw, 1.125rem); line-height: 1.7; }
.responsive-text-lg { font-size: clamp(1.125rem, 3vw, 1.25rem); line-height: 1.6; }
.responsive-text-xl { font-size: clamp(1.25rem, 4vw, 1.5rem); line-height: 1.5; }
.responsive-text-2xl { font-size: clamp(1.5rem, 5vw, 2rem); line-height: 1.4; }
.responsive-text-3xl { font-size: clamp(2rem, 6vw, 3rem); line-height: 1.3; }

/* Ultra-Fast Animations */
@media (prefers-reduced-motion: no-preference) {
    .animate-fast {
        animation-duration: 0.3s !important;
        animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1) !important;
    }
    
    .animate-gpu {
        transform: translate3d(0, 0, 0);
        will-change: transform;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, ::before, ::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Enhanced Modern Cards */
.modern-card {
    background: white;
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-color);
    transition: all var(--transition-smooth);
    will-change: transform, box-shadow;
    contain: layout style paint;
}

.modern-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-heavy);
}

.card-optimized {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    padding: 1.5rem;
    transition: box-shadow 0.3s ease, transform 0.3s ease;
    will-change: transform, box-shadow;
}

.card-optimized:hover {
    box-shadow: 0 4px 25px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

/* Lightning-Fast Buttons */
.btn-fast {
    position: relative;
    overflow: hidden;
    transition: all var(--transition-fast);
    will-change: transform;
    contain: layout style paint;
}

.btn-fast::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left var(--transition-smooth);
}

.btn-fast:hover::before {
    left: 100%;
}

.btn-fast:hover {
    transform: translateY(-2px);
}

.btn-efficient {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    will-change: transform, box-shadow;
}

.btn-efficient:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.btn-efficient:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* Fast Hover Effects */
.fast-hover {
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.fast-hover:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

/* Optimized Gradients */
.gradient-primary { background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%); }
.gradient-secondary { background: linear-gradient(135deg, var(--secondary-color) 0%, #334155 100%); }
.gradient-accent { background: linear-gradient(135deg, var(--accent-color) 0%, #ea580c 100%); }

.efficient-gradient {
    background: linear-gradient(135deg, var(--primary-color, #4f46e5) 0%, var(--secondary-color, #7c3aed) 100%);
    will-change: background;
}

/* Performance Transitions */
.transition-fast { transition: all var(--transition-fast); }
.transition-smooth { transition: all var(--transition-smooth); }
.transition-slow { transition: all var(--transition-slow); }

a, button, .btn, .card, .nav-link {
    transition: all var(--transition-smooth);
}

/* Modern Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 10px;
    transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-color));
}

/* Loading States & Skeletons */
.loading-skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: loading 2s infinite;
}

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

.loading-shimmer {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
}

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

/* Enhanced Focus States */
.modern-focus:focus-visible, .focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Form Optimizations */
.form-control-optimized {
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.75rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control-optimized:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
    outline: none;
}

/* Lazy Loading */
.lazy-load {
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.lazy-load.loaded {
    opacity: 1;
}

/* Critical Above-the-fold */
.critical-above-fold {
    font-display: swap;
}

/* IMPORTANT: never apply layout containment to <body> (it can prevent page scrolling) */
body.critical-above-fold {
    contain: none !important;
}

.above-fold {
    contain: layout style paint;
    will-change: auto;
}

/* Below-the-fold optimization */
.below-fold {
    content-visibility: auto;
    contain-intrinsic-size: 500px;
}

/* Performance Monitoring */
.perf-monitor {
    contain: strict;
    content-visibility: auto;
    contain-intrinsic-size: 300px;
}

/* GPU Acceleration */
.gpu-accelerated {
    transform: translate3d(0, 0, 0);
    will-change: transform;
}

.optimized-loader {
    will-change: transform, opacity;
    transform: translateZ(0);
}

/* Aspect Ratio Containers */
.aspect-ratio-container {
    position: relative;
    width: 100%;
    height: 0;
    overflow: hidden;
}

.aspect-ratio-16-9 { padding-bottom: 56.25%; }
.aspect-ratio-4-3 { padding-bottom: 75%; }

.aspect-ratio-content {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Fast CSS Animations */
@keyframes fadeInUp {
    from { opacity: 0; transform: translate3d(0, 30px, 0); }
    to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translate3d(0, -30px, 0); }
    to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translate3d(-30px, 0, 0); }
    to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes slideInRight {
    from { opacity: 0; transform: translate3d(30px, 0, 0); }
    to { opacity: 1; transform: translate3d(0, 0, 0); }
}

@keyframes scaleIn {
    from { opacity: 0; transform: scale3d(0.8, 0.8, 1); }
    to { opacity: 1; transform: scale3d(1, 1, 1); }
}

/* Animation Utilities */
.fade-in-up { animation: fadeInUp 0.6s var(--transition-smooth); }
.fade-in-down { animation: fadeInDown 0.6s var(--transition-smooth); }
.slide-in-left { animation: slideInLeft 0.6s var(--transition-smooth); }
.slide-in-right { animation: slideInRight 0.6s var(--transition-smooth); }
.scale-in { animation: scaleIn 0.6s var(--transition-smooth); }

/* Container Optimizations */
.container-fluid-safe {
    padding-left: max(1rem, env(safe-area-inset-left));
    padding-right: max(1rem, env(safe-area-inset-right));
}

/* Mobile Optimizations */
@media (max-width: 768px) {
    .modern-card {
        border-radius: 16px;
    }
    
    .modern-card:hover {
        transform: translateY(-4px);
    }
    
    .mobile-optimized {
        font-size: 14px;
        line-height: 1.4;
    }
    
    .mobile-hidden { display: none; }
    .mobile-padding { padding: 1rem; }
    
    ::-webkit-scrollbar {
        width: 6px;
    }
}

/* High DPI Optimizations */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .modern-card {
        border-width: 0.5px;
    }
}

/* Text Selection */
::selection {
    background: var(--primary-color);
    color: white;
}

::-moz-selection {
    background: var(--primary-color);
    color: white;
}

/* Utility Classes */
.no-gutters { margin: 0; padding: 0; }
.d-none { display: none !important; }

/* Preloader Optimization */
.preloader-optimized {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    visibility: visible;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.preloader-optimized.loaded {
    opacity: 0;
    visibility: hidden;
}