/* =================================================================
   DigiIMS Landing Page - Performance Optimizations
   Critical CSS and performance enhancements
   ================================================================= */

/* Critical CSS that should be inlined */
:root {
    --primary-color: #5850ec;
    --secondary-color: #7b5eff;
    --accent-color: #10b981;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --background-primary: #ffffff;
    --background-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --font-family-primary: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-secondary: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --background-primary: #111827;
        --background-secondary: #1f2937;
        --border-color: #374151;
        --shadow-color: rgba(0, 0, 0, 0.3);
    }
}

/* High contrast mode support */
.high-contrast {
    --primary-color: #000000;
    --secondary-color: #000000;
    --text-primary: #000000;
    --text-secondary: #000000;
    --background-primary: #ffffff;
    --border-color: #000000;
}

/* Reduced motion support */
@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;
    }
}

/* Performance optimizations */
.performance-optimized {
    will-change: transform;
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

.gpu-accelerated {
    transform: translate3d(0, 0, 0);
    will-change: transform, opacity;
}

/* Critical above-the-fold styles */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(88, 80, 236, 0.3);
}

.btn-primary:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: calc(var(--spacing-sm) - 2px) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* Navigation critical styles */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: 0 4px 20px var(--shadow-color);
}

/* Loading states */
.loading {
    pointer-events: none;
    opacity: 0.7;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Form validation styles */
.form-group {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition-normal);
    background: var(--background-primary);
    color: var(--text-primary);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(88, 80, 236, 0.1);
}

.form-control.is-valid {
    border-color: var(--accent-color);
}

.form-control.is-invalid {
    border-color: #ef4444;
}

.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
}

.error-message::before {
    content: 'âš ';
    margin-right: var(--spacing-xs);
}

/* Accessibility improvements */
.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;
}

.skip-links {
    position: absolute;
    top: -100px;
    left: 0;
    z-index: 10000;
}

.skip-link {
    position: absolute;
    top: 0;
    left: 0;
    background: var(--primary-color);
    color: white;
    padding: var(--spacing-sm);
    text-decoration: none;
    border-radius: 0 0 var(--radius-md) 0;
    font-weight: 600;
    transition: var(--transition-normal);
}

.skip-link:focus {
    top: 100px;
}

/* Enhanced accessibility features */
.sr-announce {
    position: absolute;
    left: -10000px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* ARIA live regions */
[aria-live] {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

[aria-live="polite"] {
    position: absolute;
    left: -10000px;
    width: 1px;
    height: 1px;
    overflow: hidden;
}

/* Focus indicators */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus,
a:focus,
input:focus,
textarea:focus,
select:focus,
[role="button"]:focus,
[role="tab"]:focus,
[tabindex]:focus {
    outline: 3px solid var(--primary-color) !important;
    outline-offset: 3px !important;
    box-shadow: 0 0 0 1px var(--background-primary), 0 0 0 4px var(--primary-color) !important;
}

/* Animation performance optimizations */
.animate-in {
    animation: fadeInUp 0.6s ease forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Intersection observer fallbacks */
.no-js .animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Print styles */
@media print {
    .navbar,
    .floating-demo-btn,
    .floating-elements,
    .background-animations {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .btn-primary,
    .btn-secondary {
        background: transparent !important;
        color: black !important;
        border: 1px solid black !important;
    }
}

/* Mobile-first responsive design */
@media (max-width: 768px) {
    :root {
        --spacing-xs: 0.25rem;
        --spacing-sm: 0.75rem;
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
    }
    
    .hero-section {
        min-height: 80vh;
        padding: var(--spacing-lg) var(--spacing-sm);
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
        margin-bottom: var(--spacing-sm);
    }
    
    .navbar {
        padding: var(--spacing-sm);
    }
}

/* Tablet responsive design */
@media (min-width: 769px) and (max-width: 1024px) {
    .hero-section {
        padding: var(--spacing-xl) var(--spacing-md);
    }
}

/* Desktop optimizations */
@media (min-width: 1025px) {
    .hero-section {
        padding: var(--spacing-xl);
    }
    
    /* Hover effects only on devices with hover capability */
    @media (hover: hover) {
        .btn-primary:hover,
        .btn-secondary:hover {
            transform: translateY(-2px);
        }
    }
}

/* Enhanced responsive design classes */
.responsive-container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.responsive-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: 1fr;
}

@media (min-width: 640px) {
    .responsive-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .responsive-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .responsive-container {
        padding: 0 2rem;
    }
}

@media (min-width: 1024px) {
    .responsive-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Additional mobile breakpoints */
@media (max-width: 480px) {
    :root {
        --spacing-xs: 0.25rem;
        --spacing-sm: 0.5rem;
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
    }
}

@media (max-width: 375px) {
    .btn-primary,
    .btn-secondary {
        font-size: 0.875rem;
        padding: 0.5rem 1rem;
    }
}

/* High contrast accessibility mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #000000;
        --secondary-color: #000000;
        --text-primary: #000000;
        --text-secondary: #333333;
        --background-primary: #ffffff;
        --background-secondary: #f5f5f5;
        --border-color: #000000;
    }
    
    body {
        filter: contrast(150%);
    }
    
    .btn-primary,
    .btn-secondary {
        border: 2px solid #000000 !important;
    }
}

/* Performance monitoring styles */
.performance-indicator {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    z-index: 9999;
    opacity: 0;
    transition: var(--transition-normal);
}

.performance-indicator.show {
    opacity: 1;
}

/* Critical path CSS end */