/* ========================================
   NeuraHub LTD - Light Tech Minimal Styles
   ======================================== */

/* CSS Variables */
:root {
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-card: #ffffff;
    --color-accent-blue: #2A4365;
    --color-accent-blue-hover: #233754;
    --color-accent-green: #10B981;
    --color-text-primary: #000000;
    --color-text-secondary: #4a5568;
    --color-text-muted: #718096;
    --color-border: #e9ecef;
    --color-border-light: #f1f3f4;
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --transition-base: 0.2s ease;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.08);
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg-primary: #0f172a;
        --color-bg-secondary: #1e293b;
        --color-bg-card: #1e293b;
        --color-accent-blue: #60a5fa;
        --color-accent-blue-hover: #93c5fd;
        --color-text-primary: #f1f5f9;
        --color-text-secondary: #cbd5e1;
        --color-text-muted: #94a3b8;
        --color-border: #334155;
        --color-border-light: #1e293b;
        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
    }
}

/* Reset & Base */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent-blue);
    color: white;
    padding: 8px 16px;
    z-index: 9999;
    text-decoration: none;
    font-weight: 500;
}

.skip-link:focus {
    top: 0;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text-primary);
}

a {
    color: var(--color-accent-blue);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--color-accent-blue-hover);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
}

.btn-primary {
    background: var(--color-accent-blue);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--color-accent-blue-hover);
    color: #ffffff;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-primary);
}

.btn-outline:hover {
    border-color: var(--color-accent-blue);
    color: var(--color-accent-blue);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
}

/* Try Demo Button - Top left of hero section */
.try-demo-btn {
    position: absolute;
    top: 100px;
    left: 40px;
    z-index: 10;
    padding: 8px 16px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent-green);
    background: rgba(255, 255, 255, 0.95);
    border: 2px solid var(--color-accent-green);
    border-radius: 20px;
    text-decoration: none;
    backdrop-filter: blur(8px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.try-demo-btn:hover {
    background: var(--color-accent-green);
    color: white;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-text-primary);
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--color-accent-blue);
}

.logo:hover {
    color: var(--color-text-primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
    transition: color var(--transition-base);
}

.nav-links a:hover {
    color: var(--color-text-primary);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 24px;
}

/* Language Toggle */
.lang-toggle {
    display: flex;
    background: var(--color-bg-secondary);
    border-radius: 4px;
    padding: 3px;
    border: 1px solid var(--color-border);
}

.lang-btn {
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 600;
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    border-radius: 3px;
    transition: all var(--transition-base);
}

.lang-btn.active {
    background: var(--color-accent-blue);
    color: #ffffff;
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-size: 24px;
    cursor: pointer;
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 140px 0 100px;
    background: var(--color-bg-primary);
    overflow: hidden;
}

#network-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

.hero-bg {
    display: none;
}

.orb {
    display: none;
}

.orb-1,
.orb-2,
.orb-3 {
    display: none;
}

@keyframes pulse {
    0%, 100% {
        opacity: 0;
    }
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 900px;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--color-text-primary);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto 40px;
}

/* Trust Banner */
.trust-banner {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 48px 0;
}

.trust-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.trust-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--color-text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.trust-item i {
    color: var(--color-accent-blue);
    font-size: 18px;
}

/* Sections */
.section {
    padding: 120px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    margin-bottom: 16px;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

.section-intro {
    font-size: 1rem;
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 20px auto 0;
    line-height: 1.8;
    text-align: center;
}

/* About Section */
.about {
    background: var(--color-bg-primary);
}

.about-content {
    max-width: 720px;
    margin: 0 auto;
}

.about-text p {
    color: var(--color-text-secondary);
    margin-bottom: 24px;
    font-size: 1rem;
    line-height: 1.8;
}

.about-text p:last-child {
    margin-bottom: 0;
}

/* Services Section */
.services {
    background: var(--color-bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 40px 32px;
    transition: all var(--transition-base);
}

.service-card:hover {
    border-color: var(--color-accent-blue);
    box-shadow: var(--shadow-md);
}

.service-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(42, 67, 101, 0.08);
    border-radius: 4px;
    margin-bottom: 24px;
}

.service-icon i {
    font-size: 22px;
    color: var(--color-accent-blue);
}

.service-card h3 {
    font-size: 1.125rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.service-card p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* References Section */
.references {
    background: var(--color-bg-primary);
}

.references-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.reference-category {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 32px;
    transition: all var(--transition-base);
}

.reference-category:hover {
    border-color: var(--color-accent-blue);
}

.category-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(16, 185, 129, 0.08);
    border-radius: 4px;
    margin-bottom: 20px;
}

.category-icon i {
    font-size: 18px;
    color: #10B981;
}

.reference-category h3 {
    font-size: 1rem;
    margin-bottom: 20px;
    color: var(--color-text-primary);
    font-weight: 600;
}

.reference-category ul {
    list-style: none;
}

.reference-category li {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border-light);
    position: relative;
    padding-left: 16px;
    line-height: 1.5;
}

.reference-category li:last-child {
    border-bottom: none;
}

.reference-category li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent-blue);
    font-size: 0.75rem;
}

/* Contact Section */
.contact {
    background: var(--color-bg-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-item i {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(249, 115, 22, 0.08);
    border-radius: 4px;
    color: #F97316;
    font-size: 16px;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 4px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.contact-item a,
.contact-item p {
    color: var(--color-text-primary);
    font-size: 0.95rem;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent-blue);
}

.form-group label {
    position: absolute;
    left: 16px;
    top: 14px;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    pointer-events: none;
    transition: all var(--transition-base);
    background: var(--color-bg-card);
    padding: 0 4px;
}

.form-group input:focus + label,
.form-group input:valid + label,
.form-group textarea:focus + label,
.form-group textarea:valid + label {
    top: -8px;
    font-size: 0.7rem;
    color: var(--color-accent-blue);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
    padding: 80px 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 80px;
    margin-bottom: 60px;
}

.footer-brand .logo {
    display: inline-block;
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    max-width: 280px;
    line-height: 1.7;
}

.footer-links h4,
.footer-legal h4 {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    margin-bottom: 20px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.footer-links ul,
.footer-legal ul {
    list-style: none;
}

.footer-links li,
.footer-legal li {
    margin-bottom: 12px;
}

.footer-links a,
.footer-legal a {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    transition: color var(--transition-base);
}

.footer-links a:hover,
.footer-legal a:hover {
    color: var(--color-accent-blue);
}

.footer-bottom {
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    color: var(--color-text-muted);
    font-size: 0.8rem;
}

/* Animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Mobile Navigation */
.nav-mobile {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    padding: 24px;
    z-index: 999;
}

.nav-mobile.active {
    display: block;
}

.nav-mobile ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.nav-mobile a {
    color: var(--color-text-secondary);
    font-size: 1rem;
    display: block;
    padding: 8px 0;
}

/* Responsive */
@media (max-width: 1024px) {
    .services-grid,
    .references-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-brand {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .nav-links,
    .nav-right .btn {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-right {
        gap: 16px;
    }
    
    .trust-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .services-grid,
    .references-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-brand {
        grid-column: auto;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .section {
        padding: 60px 0;
    }
}

/* Dark Mode Specific Overrides */
@media (prefers-color-scheme: dark) {
    .header {
        background: rgba(15, 23, 42, 0.95);
    }
    
    .try-demo-btn {
        background: rgba(15, 23, 42, 0.95);
    }
    
    .btn-primary {
        background: var(--color-accent-blue);
        color: #0f172a;
    }
    
    .btn-primary:hover {
        background: var(--color-accent-blue-hover);
    }
    
    .logo span {
        color: var(--color-accent-blue);
    }
    
    .service-card,
    .reference-category {
        background: var(--color-bg-card);
        border-color: var(--color-border);
    }
    
    .contact-form input,
    .contact-form textarea {
        background: var(--color-bg-secondary);
        border-color: var(--color-border);
        color: var(--color-text-primary);
    }
    
    .footer {
        background: var(--color-bg-secondary);
    }
}