/* Enhanced CSS Variables for consistency and easy maintenance */
:root {
    /* Base sizing system */
    --size-base: 16px;
    --size-scale: 1.25;
    
    /* Color system */
    --color-primary: #6f42c1;
    --color-secondary: #5a32a3;
    --color-accent: #974eb1;
    --color-text: #333;
    --color-text-light: #666;
    --color-text-lighter: #bdc3c7;
    --color-bg: #fff;
    --color-bg-light: #f8f9fa;
    --color-bg-dark: #2c3e50;
    --color-border: #e9ecef;
    --color-success: #28a745;
    --color-error: #dc3545;
    --color-warning: #ffc107;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #352277 0%, #974eb1 100%);
    --gradient-secondary: linear-gradient(135deg, #6f42c1, #5a32a3);
    --gradient-feature: linear-gradient(135deg, #667eea, #764ba2);
    --gradient-card: linear-gradient(90deg, #667eea, #764ba2);
    
    /* Shadows with performance optimization */
    --shadow-light: 0 2px 8px rgba(0,0,0,0.1);
    --shadow-heavy: 0 4px 20px rgba(0,0,0,0.15);
    --shadow-header: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-card: 0 3px 15px rgba(0,0,0,0.1);
    --shadow-focus: 0 0 0 3px rgba(111, 66, 193, 0.2);
    
    /* Border radius */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --radius-circle: 50%;
    
    /* Transitions - optimized for performance */
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Spacing system */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Typography scale */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    
    /* Z-index scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    
    /* Breakpoints (for use in calc functions) */
    --bp-sm: 480px;
    --bp-md: 768px;
    --bp-lg: 1024px;
    --bp-xl: 1200px;
    
    /* Mobile viewport fix */
    --vh: 1vh;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    :root {
        --color-text: #e0e0e0;
        --color-text-light: #b0b0b0;
        --color-text-lighter: #888;
        --color-bg: #1a1a1a;
        --color-bg-light: #2a2a2a;
        --color-bg-dark: #0f0f0f;
        --color-border: #404040;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-text: #000;
        --color-bg: #fff;
        --color-border: #000;
        --shadow-light: 0 2px 8px rgba(0,0,0,0.3);
        --shadow-heavy: 0 4px 20px rgba(0,0,0,0.4);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    :root {
        --transition-fast: none;
        --transition-smooth: none;
        --transition-slow: none;
    }
    
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: var(--size-base);
    scroll-behavior: smooth;
    text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    overflow-x: hidden;
}

/* Device-specific classes */
.mobile-device {
    --font-size-3xl: 1.75rem;
    --font-size-4xl: 2rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
}

.tablet-device {
    --font-size-3xl: 2.25rem;
    --font-size-4xl: 2.75rem;
}

.touch-device .hover-effect {
    transition: none;
}

.reduced-motion * {
    animation: none !important;
    transition: none !important;
}

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

:focus:not(:focus-visible) {
    outline: none;
}

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

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--color-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: var(--z-tooltip);
}

.skip-link:focus {
    top: 6px;
}

/* Header Styles */
.header {
    background: var(--color-bg);
    box-shadow: var(--shadow-header);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: var(--z-fixed);
    transition: var(--transition-fast);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.nav-container {
    max-width: var(--bp-xl);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    position: relative;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    z-index: var(--z-modal);
}

.logo:focus {
    outline-offset: 4px;
}

.logo img {
    height: 40px;
    width: auto;
    display: block;
}

/* Desktop Navigation */
.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-menu a {
    text-decoration: none;
    color: var(--color-text);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    position: relative;
}

.nav-menu a:hover {
    color: var(--color-primary);
    background: rgba(111, 66, 193, 0.1);
}

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

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    z-index: var(--z-modal);
    position: relative;
    width: 30px;
    height: 30px;
    justify-content: center;
    align-items: center;
}

.menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--color-text);
    margin: 2px 0;
    transition: var(--transition-fast);
    transform-origin: center;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    height: calc(var(--vh, 1vh) * 100);
    background: var(--color-bg);
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: var(--z-modal-backdrop);
    display: flex;
    flex-direction: column;
    padding-top: 80px;
    overflow-y: auto;
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-menu .nav-menu {
    flex-direction: column;
    gap: 0;
    padding: var(--spacing-lg);
}

.mobile-menu .nav-menu a {
    display: block;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
    border-bottom: 1px solid var(--color-border);
    border-radius: 0;
}

.mobile-menu .nav-menu a:hover {
    background: var(--color-bg-light);
}

/* Body scroll lock when menu is open */
.menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
}

/* Search Icon */
.search-icon {
    cursor: pointer;
    font-size: var(--font-size-lg);
    color: var(--color-text-light);
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.search-icon:hover {
    color: var(--color-primary);
    background: rgba(111, 66, 193, 0.1);
}

/* Language Toggle */
.language-toggle {
    display: flex;
    background: var(--color-bg-light);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--color-border);
    position: relative;
}

.lang-btn {
    padding: 6px 12px;
    border: none;
    background: transparent;
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
    position: relative;
    min-width: 40px;
    text-align: center;
}

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

.lang-btn:hover:not(.active) {
    background: var(--color-border);
    color: var(--color-text);
}

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

/* Touch feedback */
.touch-active {
    transform: scale(0.95);
    opacity: 0.8;
}

/* Loading state */
.loading {
    position: relative;
    pointer-events: none;
    opacity: 0.7;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 16px;
    height: 16px;
    margin: -8px 0 0 -8px;
    border: 2px solid transparent;
    border-top: 2px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Hero Section */
.hero {
    background: var(--gradient-primary);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 60vh;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    max-width: var(--bp-xl);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
    line-height: 1.2;
}

.hero p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.5;
}

/* Button Styles */
.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px; /* Touch target size */
    position: relative;
    white-space: nowrap;
}

.btn:focus {
    box-shadow: var(--shadow-focus);
}

.btn:active {
    transform: translateY(1px);
}

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

.btn-primary:hover {
    background: var(--color-bg-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.btn-secondary {
    background: transparent;
    color: var(--color-bg);
    border: 2px solid var(--color-bg);
}

.btn-secondary:hover {
    background: var(--color-bg);
    color: var(--color-primary);
}

/* Container */
.container {
    max-width: var(--bp-xl);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Section Styles */
.features, .services {
    padding: 80px 0;
    background: var(--color-bg-light);
}

.news {
    padding: 80px 0;
    background: var(--color-bg);
}

.section-title {
    text-align: center;
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-xl);
    color: var(--color-text);
    line-height: 1.3;
}

/* Grid Layouts with improved responsive behavior */
.features-grid, .news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

/* Card Styles with performance optimization */
.feature-card, .news-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
    will-change: transform;
}

.feature-card {
    padding: var(--spacing-lg);
    text-align: center;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-card);
}

.feature-card:hover, .news-card:hover {
    transform: translate3d(0, -5px, 0);
    box-shadow: var(--shadow-heavy);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-feature);
    border-radius: var(--radius-circle);
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--spacing-lg);
    color: white;
}

.feature-card h3, .news-card h3 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    line-height: 1.3;
}

.feature-card p, .news-card p {
    color: var(--color-text-light);
    line-height: 1.6;
}

/* News Card Specific */
.news-image {
    width: 100%;
    height: 200px;
    background: var(--gradient-feature);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-lg);
    position: relative;
    overflow: hidden;
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.news-image img.loaded {
    opacity: 1;
}

.news-content {
    padding: var(--spacing-md);
}

.news-card h3 {
    font-size: var(--font-size-xl);
}

.news-card p {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
}

/* Service Items */
.service-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-bg-light);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.service-item:hover {
    background: var(--color-bg);
    box-shadow: var(--shadow-light);
    transform: translateY(-2px);
}

.service-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-feature);
    border-radius: var(--radius-circle);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.service-content h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
}

.service-content p {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

/* Contact CTA */
.contact-cta {
    background: var(--gradient-secondary);
    color: white;
    padding: 60px 0;
    text-align: center;
}

.contact-cta h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.contact-cta p {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    line-height: 1.5;
}

/* Footer */
.footer {
    background: var(--color-bg-dark);
    color: var(--color-bg);
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-bg);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: var(--color-text-lighter);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-section a:hover {
    color: var(--color-bg);
}

.footer-section a:focus {
    outline: 2px solid var(--color-bg);
    outline-offset: 2px;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-lighter);
}

.footer-logo {
    margin-bottom: var(--spacing-sm);
}

.footer-logo-image {
    width: 120px;
    height: 60px;
    background: #000;
    border-radius: var(--radius-md);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .nav-container {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .features-grid, .news-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero {
        padding: 100px 0 60px;
        min-height: 50vh;
    }
    
    .hero h1 {
        font-size: var(--font-size-3xl);
    }
    
    .hero p {
        font-size: var(--font-size-lg);
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
        padding: 14px 24px;
    }
    
    .features-grid,
    .news-grid,
    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .features, .services, .news {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: var(--spacing-sm);
    }
    
    .hero {
        padding: 80px 0 40px;
    }
    
    .hero h1 {
        font-size: var(--font-size-2xl);
    }
    
    .hero p {
        font-size: var(--font-size-base);
    }
    
    .feature-card, .news-card {
        padding: var(--spacing-md);
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* Print styles */
@media print {
    .header,
    .mobile-menu,
    .menu-toggle,
    .cta-buttons,
    .contact-cta {
        display: none;
    }
    
    .hero {
        background: none;
        color: var(--color-text);
    }
    
    * {
        box-shadow: none !important;
    }
}

/* High performance animations */
@media (prefers-reduced-motion: no-preference) {
    .feature-card,
    .news-card,
    .service-item {
        will-change: transform;
    }
}

/* Support for older browsers */
@supports not (backdrop-filter: blur(10px)) {
    .header.scrolled {
        background: rgba(255, 255, 255, 0.98);
    }
}

@supports not (display: grid) {
    .features-grid,
    .news-grid,
    .services-grid {
        display: flex;
        flex-wrap: wrap;
    }
    
    .feature-card,
    .news-card,
    .service-item {
        flex: 1 1 300px;
        margin: var(--spacing-sm);
    }
}