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

:root {
    /* High-Contrast & Modern Palette */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #60a5fa;
    --secondary-color: #06b6d4;
    --secondary-dark: #0891b2;
    --accent-color: #3b82f6;
    --accent-light: #a78bfa;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --text-white: #ffffff;
    --text-on-dark: #e5e7eb;
    --text-on-dark-strong: #ffffff;
    --background-primary: #ffffff;
    --background-secondary: #f8fafc;
    --background-dark: #111827;
    --background-glass: rgba(255, 255, 255, 0.1);
    --border-color: #e5e7eb;
    --shadow-light: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-large: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --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: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-dark);
    overflow-x: hidden;
}

/* Three.js Canvas Background */
#three-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #4f46e5 0%, #111827 70%);
    opacity: 0.5;
    transition: transform 0.1s ease-out;
}

/* Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 1000;
    transition: top var(--transition-fast);
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

p {
    margin-bottom: var(--spacing-md);
}

.lead {
    font-size: var(--font-size-lg);
    font-weight: 400;
    color: var(--text-on-dark);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.nav-brand .tagline {
    font-size: var(--font-size-xs);
    color: var(--text-light);
    display: block;
    margin-top: -4px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color var(--transition-fast);
    padding: var(--spacing-sm) 0;
    position: relative;
}

/* restore underline default for nav-menu links */
.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-normal);
}

.nav-menu a:hover::after,
.nav-menu a:focus::after {
    width: 100%;
}

.nav-menu a:hover,
.nav-menu a:focus {
    color: var(--primary-color);
}

/* Dark navbar link colors */
.navbar.dark .nav-menu a {
    color: var(--text-white);
}

.navbar.dark .nav-menu a:hover,
.navbar.dark .nav-menu a:focus {
    color: var(--primary-light);
}

/* Underline for dark */
.navbar.dark .nav-menu a::after {
    background: var(--primary-light);
}

/* Hamburger icon lines color for dark */
.navbar.dark .nav-toggle span {
    background: var(--text-white);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition-fast);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    cursor: pointer;
}

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

.btn-primary:hover,
.btn-primary:focus {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
    background: transparent;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    animation: fadeInUp 1s ease-out;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
    color: var(--text-on-dark-strong);
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--text-on-dark);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-lg);
    justify-content: center;
    margin-bottom: var(--spacing-3xl);
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--text-on-dark-strong);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-on-dark);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Sections */
section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    position: relative;
    color: var(--text-on-dark-strong);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--text-on-dark);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* About Section */
.about {
    background: transparent;
    padding: var(--spacing-3xl) 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.feature {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--background-primary);
    border-radius: 12px; 
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-normal);
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.feature-icon {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-md);
    display: block;
}

.feature h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature p {
    color: var(--text-secondary);
    margin: 0;
}

/* Products Section */
.products {
    background: transparent;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.product-card {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-xl);
    background: var(--background-primary);
    border-radius: 16px;
    box-shadow: var(--shadow-large);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
    border: 1px solid var(--border-color);
}

.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-large);
}

.product-header {
    margin-bottom: var(--spacing-lg);
}

.product-icon {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-md);
}

.product-card h3 {
    font-size: var(--font-size-2xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.product-tagline {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-lg);
}

.product-content {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
}

.product-content p {
    margin-bottom: var(--spacing-lg);
}

.product-features {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.feature-item:last-child {
    margin-bottom: 0;
}

.feature-item p {
    margin: 0;
}

.product-card h3 a {
    text-decoration: none;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.product-card h3 a:hover,
.product-card h3 a:focus {
    color: var(--primary-color);
}

.product-cta {
    margin-top: var(--spacing-lg);
    align-self: flex-end;
    text-align: right;
}

/* Research Section */
.research {
    background: transparent;
}

.research-areas {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.research-area {
    background: var(--background-primary);
    padding: var(--spacing-xl);
    border-radius: 16px;
    box-shadow: var(--shadow-medium);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.research-area:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-large);
}

.research-area h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.research-area p {
    margin: 0;
    color: var(--text-secondary);
}

/* Contact Section */
.contact {
    background: transparent;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.contact-method {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    padding: var(--spacing-xl);
    background: var(--background-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-normal);
}

.contact-method:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.contact-icon {
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
}

.contact-method strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.contact-method p {
    margin: 0;
    color: var(--text-secondary);
}

.contact-method-single {
    display: flex;
    justify-content: center;
    text-align: center;
    gap: var(--spacing-md);
    align-items: center;
    padding: var(--spacing-xl);
    background: var(--background-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-normal);
    width: 100%;
    max-width: 400px;
    margin: var(--spacing-xl) auto 0;
}

.contact-method-single:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-large);
}

.contact-email {
    font-weight: 500;
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-email:hover,
.contact-email:focus {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Footer */
.footer {
    background: var(--background-dark);
    color: white;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

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

.footer-brand p {
    color: #9ca3af;
    margin: 0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-xl);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-base);
}

.footer-link {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-link:hover,
.footer-link:focus {
    color: var(--primary-dark);
    text-decoration: underline;
}

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

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

.footer-section a {
    color: #9ca3af;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover,
.footer-section a:focus {
    color: var(--primary-color);
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid #374151;
    text-align: center;
}

.footer-bottom p {
    margin: 0;
    color: #9ca3af;
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --font-size-6xl: 2.5rem;
        --font-size-5xl: 2rem;
        --font-size-4xl: 1.75rem;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-medium);
        gap: var(--spacing-md);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .research-areas {
        grid-template-columns: 1fr;
    }
    
    .contact-methods {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-container {
        padding: 0 var(--spacing-md);
    }
    
    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
        min-height: 90vh;
    }
    
    .product-card,
    .feature,
    .research-area,
    .contact-method {
        padding: var(--spacing-lg);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #000000;
        --text-secondary: #000000;
        --border-color: #000000;
        --background-primary: #ffffff;
    }
}

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

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

/* Print styles */
@media print {
    .navbar,
    .footer,
    #three-canvas {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .hero {
        background: white;
    }
}

/* Keep mobile nav links dark even when navbar is in dark mode */
.nav-menu.active a {
    color: var(--text-primary) !important;
}

.nav-menu.active a:hover,
.nav-menu.active a:focus {
    color: var(--primary-color) !important;
}

/* Redesigned Product Cards */
.product-card.redesigned {
    display: flex;
    flex-direction: row;
    padding: 0;
    overflow: hidden;
    border-radius: 20px;
    box-shadow: var(--shadow-large);
    border: none;
    background: var(--background-primary);
    min-height: 220px;
    position: relative;
    margin-bottom: var(--spacing-2xl);
}
.product-card-bar {
    width: 8px;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    border-radius: 8px 0 0 8px;
    flex-shrink: 0;
}
.product-card-main {
    flex: 1 1 0;
    padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-xl) var(--spacing-lg);
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.product-card .product-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}
.product-card .product-icon {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(99,102,241,0.10);
}
.product-card .product-header h3 {
    margin-bottom: 0;
}
.product-card .product-tagline {
    margin-bottom: 0;
    font-size: var(--font-size-base);
    color: var(--primary-color);
    font-weight: 600;
}
.product-card .product-content {
    margin-top: var(--spacing-md);
}
.product-features.redesigned {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-md) 0;
}
.feature-pill {
    display: flex;
    align-items: center;
    gap: 0.5em;
    background: linear-gradient(90deg, var(--primary-light) 0%, var(--accent-light) 100%);
    color: #fff;
    font-weight: 500;
    border-radius: 999px;
    padding: 0.4em 1em;
    font-size: var(--font-size-sm);
    box-shadow: 0 1px 4px rgba(99,102,241,0.08);
    margin-bottom: 0.25em;
    transition: background 0.2s;
}
.feature-pill .feature-icon {
    font-size: 1.3em;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}
.product-cta {
    margin-top: var(--spacing-lg);
    align-self: stretch;
    text-align: right;
}
.product-card.redesigned:hover {
    box-shadow: 0 8px 32px rgba(99,102,241,0.18);
    transform: translateY(-4px) scale(1.02);
}

/* Redesigned Research Cards */
.research-areas.redesigned {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}
.research-area.redesigned {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    background: linear-gradient(120deg, var(--background-primary) 80%, var(--accent-light) 100%);
    border-radius: 20px;
    box-shadow: var(--shadow-medium);
    overflow: hidden;
    min-height: 160px;
    position: relative;
    transition: box-shadow 0.2s, transform 0.2s;
}
.research-area.redesigned:hover {
    box-shadow: 0 8px 32px rgba(99,102,241,0.15);
    transform: translateY(-3px) scale(1.01);
}
.research-bar {
    width: 8px;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    border-radius: 8px 0 0 8px;
    flex-shrink: 0;
    height: 100%;
}
.research-main {
    flex: 1 1 0;
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.research-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-color);
    background: var(--accent-light);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 4px rgba(99,102,241,0.10);
}
.research-area.redesigned h3 {
    color: var(--primary-dark);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-lg);
}
.research-area.redesigned p {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    margin: 0;
}

@media (max-width: 1200px) {
    .research-areas.redesigned {
        grid-template-columns: repeat(2, 1fr);
    }
}
@media (max-width: 700px) {
    .research-areas.redesigned {
        grid-template-columns: 1fr;
    }
}