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

:root {
    /* Light theme colors */
    --primary-color: #007AFF;
    --primary-dark: #0056CC;
    --primary-light: #4A9EFF;
    --secondary-color: #5856D6;
    --accent-color: #FF3B30;
    --success-color: #34C759;
    --warning-color: #FF9500;
    
    /* Neutral colors */
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --text-tertiary: #AEAEB2;
    --background-primary: #FFFFFF;
    --background-secondary: #F2F2F7;
    --background-tertiary: #E5E5EA;
    --border-color: #D1D1D6;
    
    /* Shadows */
    --shadow-small: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-large: 0 8px 24px rgba(0, 0, 0, 0.2);
    --shadow-extra-large: 0 16px 48px rgba(0, 0, 0, 0.25);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    --spacing-3xl: 64px;
    --spacing-4xl: 96px;
    
    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50%;
    
    /* Transitions */
    --transition-fast: 0.15s ease-out;
    --transition-normal: 0.3s ease-out;
    --transition-slow: 0.5s ease-out;
    
    /* 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;
}

/* Dark theme colors */
[data-theme="dark"] {
    --text-primary: #FFFFFF;
    --text-secondary: #AEAEB2;
    --text-tertiary: #8E8E93;
    --background-primary: #000000;
    --background-secondary: #1C1C1E;
    --background-tertiary: #2C2C2E;
    --border-color: #38383A;
    
    --shadow-small: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-large: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-extra-large: 0 16px 48px rgba(0, 0, 0, 0.6);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

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

h1 {
    font-size: clamp(var(--font-size-4xl), 5vw, var(--font-size-6xl));
    font-weight: 700;
}

h2 {
    font-size: clamp(var(--font-size-3xl), 4vw, var(--font-size-5xl));
}

h3 {
    font-size: clamp(var(--font-size-2xl), 3vw, var(--font-size-3xl));
}

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

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

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

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

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

/* Text Gradient */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

[data-theme="dark"] .header {
    background: rgba(0, 0, 0, 0.8);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo {
    width: 32px;
    height: 32px;
}

.brand-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
}

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

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-fast);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.theme-toggle,
.language-toggle {
    background: var(--background-secondary);
    border: none;
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-primary);
}

.theme-toggle:hover,
.language-toggle:hover {
    background: var(--background-tertiary);
    transform: scale(1.05);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    color: var(--text-primary);
    cursor: pointer;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
}

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 20%, rgba(0, 122, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(88, 86, 214, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 60%, rgba(255, 59, 48, 0.05) 0%, transparent 50%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    margin-bottom: var(--spacing-lg);
}

.hero-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-2xl);
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.tech-stack {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .tech-stack {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .tech-stack {
        grid-template-columns: 1fr;
    }
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    background: var(--background-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    min-height: 120px;
}

.tech-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-large);
}

.tech-item i {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.tech-item[data-tech="Angular"] i { color: #DD0031; }
.tech-item[data-tech=".NET Core"] i { color: #512BD4; }
.tech-item[data-tech="AI"] i { color: #FF6B6B; }
.tech-item[data-tech="Blockchain"] i { color: #F7931A; }
.tech-item[data-tech="Analytics"] i { color: #28A745; }
.tech-item[data-tech="DGS"] i { color: #4ECDC4; }

    .tech-item::after {
        content: attr(data-tech);
        position: absolute;
        bottom: var(--spacing-sm);
        font-weight: 600;
        color: var(--text-primary);
        font-size: var(--font-size-sm);
        text-align: center;
        width: 100%;
        left: 0;
    }

/* Section Styles */
.section {
    padding: var(--spacing-4xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-4xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    margin-bottom: var(--spacing-lg);
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

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

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-2xl);
}

.service-card {
    background: var(--background-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-small);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-large);
}

.service-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.service-icon i {
    font-size: 1.5rem;
    color: white;
}

.service-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.service-card p {
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.service-features {
    list-style: none;
}

.service-features li {
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* Technologies Section */
.tech-showcase {
    display: grid;
    gap: var(--spacing-4xl);
}

.tech-category {
    text-align: center;
}

.tech-category h3 {
    margin-bottom: var(--spacing-2xl);
    color: var(--text-primary);
}

.tech-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.tech-badge {
    background: var(--background-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-small);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.tech-badge:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
}

.tech-badge i {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.tech-badge span {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.tech-badge p {
    font-size: var(--font-size-sm);
    margin: 0;
}

/* DGS Platform Section */
.dgs-platform {
    background: linear-gradient(135deg, var(--background-secondary) 0%, var(--background-tertiary) 100%);
}

.platform-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.platform-features {
    margin-top: var(--spacing-2xl);
}

.feature-item {
    display: flex;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    align-items: flex-start;
}

.feature-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: var(--spacing-sm);
}

.feature-item h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

.dgs-diagram {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto;
}

.dgs-node {
    position: absolute;
    width: 80px;
    height: 80px;
    background: var(--background-primary);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-medium);
    transition: all var(--transition-normal);
}

.dgs-node:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-large);
}

.dgs-node.central {
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    z-index: 2;
}

.dgs-node.central:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.dgs-node:nth-child(2) { top: 20%; left: 50%; transform: translateX(-50%); }
.dgs-node:nth-child(3) { top: 50%; right: 0; transform: translateY(-50%); }
.dgs-node:nth-child(4) { bottom: 20%; left: 50%; transform: translateX(-50%); }
.dgs-node:nth-child(5) { top: 50%; left: 0; transform: translateY(-50%); }

.dgs-node i {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.dgs-node span {
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-align: center;
}

/* AI Features Section */
.ai-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-2xl);
}

.ai-card {
    background: var(--background-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-small);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
    text-align: center;
}

.ai-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-large);
}

.ai-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #FF6B6B, #4ECDC4);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
}

.ai-icon i {
    font-size: 2rem;
    color: white;
}

.ai-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.ai-card p {
    margin: 0;
    line-height: 1.7;
}

/* Games Section */
.games {
    background: var(--background-secondary);
}

.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-2xl);
}

.game-category {
    background: var(--background-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-small);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
    text-align: center;
}

.game-category:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-large);
}

.game-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
}

.game-icon i {
    font-size: 2rem;
    color: white;
}

.game-category h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.game-category p {
    margin: 0;
    line-height: 1.7;
}

/* Demo Sites Section */
.demos {
    background: var(--background-secondary);
}

.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-4xl);
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.demo-card {
    background: var(--background-primary);
    padding: var(--spacing-3xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    position: relative;
    text-align: center;
    overflow: hidden;
}

.demo-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.demo-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-extra-large);
}

.demo-badge {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 0.5px;
    box-shadow: var(--shadow-small);
}

.demo-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: var(--spacing-2xl) auto var(--spacing-xl);
    position: relative;
    box-shadow: var(--shadow-medium);
}

.demo-icon i {
    font-size: 2.5rem;
    color: white;
}

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

.demo-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.demo-features {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.demo-tag {
    background: var(--background-secondary);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.demo-card .btn {
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
}

.demo-note {
    background: var(--background-primary);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    max-width: 900px;
    margin: 0 auto;
    box-shadow: var(--shadow-small);
}

.demo-note-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.demo-note-icon i {
    font-size: 1.5rem;
    color: white;
}

.demo-note-content h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-size: var(--font-size-xl);
}

.demo-note-content p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: var(--font-size-base);
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-4xl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

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

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-top: var(--spacing-sm);
}

.contact-item h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

.contact-item p a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-item p a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.contact-options {
    display: grid;
    gap: var(--spacing-2xl);
}

.contact-method {
    background: var(--background-primary);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-medium);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-normal);
}

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

.contact-method-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    transition: all var(--transition-normal);
}

.contact-method:hover .contact-method-icon {
    transform: scale(1.1) rotate(5deg);
}

.contact-method-icon i {
    font-size: 2rem;
    color: white;
}

.contact-method h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.contact-method p {
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
    line-height: 1.7;
}

.contact-method .btn {
    width: 100%;
    max-width: 250px;
}

/* Footer */
.footer {
    background: var(--background-secondary);
    padding: var(--spacing-4xl) 0 var(--spacing-2xl);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-4xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand img {
    width: 40px;
    height: 40px;
    margin-bottom: var(--spacing-md);
}

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

.footer-brand p {
    margin: 0;
    line-height: 1.7;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-2xl);
}

.footer-column h4 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

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

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

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

.footer-column a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

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

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--background-tertiary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

/* Responsive Design */

/* Large Desktop (1400px+) */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
    }
    
    .hero-title {
        font-size: clamp(3rem, 6vw, 5rem);
    }
    
    .section-title {
        font-size: clamp(2.5rem, 5vw, 4rem);
    }
}

/* Desktop (1024px - 1399px) */
@media (max-width: 1399px) and (min-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-3xl);
        text-align: center;
    }
    
    .hero-visual {
        order: -1;
        margin-bottom: var(--spacing-2xl);
    }
    
    .platform-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-3xl);
        text-align: center;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-3xl);
    }
    
    .footer-content {
        grid-template-columns: 1fr 2fr;
        gap: var(--spacing-3xl);
    }
}

/* Tablet Landscape (768px - 1023px) */
@media (max-width: 1023px) and (min-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--background-primary);
        transition: left var(--transition-normal);
        z-index: 999;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu .nav-list {
        flex-direction: column;
        padding: var(--spacing-2xl);
        gap: var(--spacing-lg);
        align-items: center;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }
    
    .hero-buttons {
        flex-direction: row;
        justify-content: center;
        gap: var(--spacing-lg);
        flex-wrap: wrap;
    }
    
    .hero-buttons .btn {
        flex: 1;
        min-width: 200px;
        max-width: 250px;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
    
    .tech-items {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
    
    .ai-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
    
    .games-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-xl);
    }
    
    .demo-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-2xl);
    }
    
    .demo-card {
        padding: var(--spacing-2xl);
    }
    
    .platform-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xl);
    }
    
    .dgs-diagram {
        width: 350px;
        height: 350px;
    }
    
    .dgs-node {
        width: 70px;
        height: 70px;
    }
    
    .dgs-node i {
        font-size: 1.4rem;
    }
    
    .dgs-node span {
        font-size: 0.8rem;
    }
}

/* Tablet Portrait (481px - 767px) */
@media (max-width: 767px) and (min-width: 481px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--background-primary);
        transition: left var(--transition-normal);
        z-index: 999;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu .nav-list {
        flex-direction: column;
        padding: var(--spacing-xl);
        gap: var(--spacing-md);
        align-items: center;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .hero {
        min-height: 80vh;
        padding: var(--spacing-2xl) 0;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .section {
        padding: var(--spacing-3xl) 0;
    }
    
    .section-header {
        margin-bottom: var(--spacing-3xl);
    }
    
    .services-grid,
    .tech-items,
    .ai-grid,
    .games-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .tech-showcase {
        gap: var(--spacing-3xl);
    }
    
    .platform-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .platform-features {
        margin-top: var(--spacing-xl);
    }
    
    .feature-item {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-md);
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .contact-options {
        gap: var(--spacing-lg);
    }
    
    .contact-method {
        padding: var(--spacing-lg);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .dgs-diagram {
        width: 280px;
        height: 280px;
    }
    
    .dgs-node {
        width: 60px;
        height: 60px;
    }
    
    .dgs-node i {
        font-size: 1.2rem;
    }
    
    .dgs-node span {
        font-size: 0.7rem;
    }
}

/* Mobile Landscape (376px - 480px) */
@media (max-width: 480px) and (min-width: 376px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--background-primary);
        transition: left var(--transition-normal);
        z-index: 999;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu .nav-list {
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-sm);
        align-items: center;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-controls {
        gap: var(--spacing-sm);
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero {
        min-height: 70vh;
        padding: var(--spacing-xl) 0;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .hero-title {
        font-size: clamp(1.8rem, 8vw, 2.5rem);
        margin-bottom: var(--spacing-md);
    }
    
    .hero-description {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-lg);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 260px;
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
    
    .tech-stack {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .tech-item {
        padding: var(--spacing-md);
    }
    
    .tech-item i {
        font-size: 2rem;
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .section-header {
        margin-bottom: var(--spacing-2xl);
    }
    
    .section-title {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }
    
    .section-description {
        font-size: var(--font-size-base);
    }
    
    .services-grid,
    .tech-items,
    .ai-grid,
    .games-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .service-card,
    .ai-card,
    .game-category,
    .contact-method {
        padding: var(--spacing-lg);
    }
    
    .service-icon,
    .ai-icon,
    .game-icon,
    .contact-method-icon {
        width: 60px;
        height: 60px;
        margin-bottom: var(--spacing-md);
    }
    
    .service-icon i,
    .ai-icon i,
    .game-icon i,
    .contact-method-icon i {
        font-size: 1.5rem;
    }
    
    .tech-showcase {
        gap: var(--spacing-2xl);
    }
    
    .tech-badge {
        padding: var(--spacing-lg);
    }
    
    .tech-badge i {
        font-size: 1.5rem;
    }
    
    .platform-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .platform-features {
        margin-top: var(--spacing-lg);
    }
    
    .feature-item {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-lg);
    }
    
    .feature-item i {
        margin-top: 0;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .contact-options {
        gap: var(--spacing-md);
    }
    
    .contact-method .btn {
        max-width: 200px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
    
    .dgs-diagram {
        width: 240px;
        height: 240px;
    }
    
    .dgs-node {
        width: 50px;
        height: 50px;
    }
    
    .dgs-node i {
        font-size: 1rem;
    }
    
    .dgs-node span {
        font-size: 0.6rem;
    }
}

/* Mobile spacing fix */
@media (max-width: 767px) {
    .hero {
        margin-top: 70px !important;
    }
}

/* Modern Mobile Phones (iPhone 12+ and similar) */
@media (max-width: 428px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--background-primary);
        transition: left var(--transition-normal);
        z-index: 999;
        overflow-y: auto;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-menu .nav-list {
        flex-direction: column;
        padding: var(--spacing-xl);
        gap: var(--spacing-lg);
        align-items: center;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-controls {
        gap: var(--spacing-sm);
    }
    
    .theme-toggle,
    .language-toggle {
        padding: var(--spacing-sm);
    }
    
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .hero {
        min-height: 80vh;
        padding: var(--spacing-2xl) 0;
    }
    
    .hero .container {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .hero-title {
        font-size: clamp(2rem, 8vw, 2.8rem);
        line-height: 1.2;
        margin-bottom: var(--spacing-lg);
    }
    
    .hero-description {
        font-size: var(--font-size-lg);
        line-height: 1.6;
        margin-bottom: var(--spacing-xl);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-md);
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 280px;
        padding: var(--spacing-md) var(--spacing-xl);
        font-size: var(--font-size-lg);
    }
    
    .tech-stack {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
        max-width: 480px;
        margin: 0 auto;
    }
    
    .tech-item {
        padding: var(--spacing-md);
        min-height: 100px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }
    
    .tech-item i {
        font-size: 2rem;
        margin-bottom: var(--spacing-xs);
    }
    
    .section {
        padding: var(--spacing-3xl) 0;
    }
    
    .section-header {
        margin-bottom: var(--spacing-3xl);
    }
    
    .section-title {
        font-size: clamp(2rem, 6vw, 2.5rem);
        line-height: 1.2;
    }
    
    .section-description {
        font-size: var(--font-size-lg);
        line-height: 1.6;
    }
    
    .services-grid,
    .ai-grid,
    .games-grid,
    .demo-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .demo-card {
        padding: var(--spacing-2xl);
    }
    
    .demo-icon {
        width: 80px;
        height: 80px;
        margin: var(--spacing-xl) auto var(--spacing-lg);
    }
    
    .demo-icon i {
        font-size: 2rem;
    }
    
    .demo-note {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-xl);
    }
    
    .demo-note-icon {
        margin: 0 auto;
    }
    
    .tech-items {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
    
    .service-card,
    .ai-card,
    .game-category,
    .contact-method {
        padding: var(--spacing-xl);
    }
    
    .service-icon,
    .ai-icon,
    .game-icon,
    .contact-method-icon {
        width: 70px;
        height: 70px;
        margin-bottom: var(--spacing-lg);
    }
    
    .service-icon i,
    .ai-icon i,
    .game-icon i,
    .contact-method-icon i {
        font-size: 2rem;
    }
    
    .tech-showcase {
        gap: var(--spacing-3xl);
    }
    
    .tech-badge {
        padding: var(--spacing-lg);
    }
    
    .tech-badge i {
        font-size: 2rem;
    }
    
    .platform-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .platform-features {
        margin-top: var(--spacing-xl);
    }
    
    .feature-item {
        flex-direction: row;
        text-align: left;
        gap: var(--spacing-lg);
        margin-bottom: var(--spacing-xl);
    }
    
    .feature-item i {
        margin-top: var(--spacing-xs);
        font-size: 1.5rem;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .contact-options {
        gap: var(--spacing-lg);
    }
    
    .contact-method .btn {
        max-width: 220px;
        font-size: var(--font-size-base);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        text-align: center;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
        gap: var(--spacing-md);
    }
    
    .social-links a {
        width: 45px;
        height: 45px;
    }
    
    .dgs-diagram {
        width: 280px;
        height: 280px;
    }
    
    .dgs-node {
        width: 60px;
        height: 60px;
    }
    
    .dgs-node i {
        font-size: 1.5rem;
    }
    
    .dgs-node span {
        font-size: 0.8rem;
    }
}

/* Small Mobile Phones (iPhone SE and similar) */
@media (max-width: 375px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .hero {
        min-height: 70vh;
        padding: var(--spacing-xl) 0;
    }
    
    .hero-title {
        font-size: clamp(1.8rem, 8vw, 2.2rem);
        margin-bottom: var(--spacing-md);
    }
    
    .hero-description {
        font-size: var(--font-size-base);
        margin-bottom: var(--spacing-lg);
    }
    
    .hero-buttons .btn {
        max-width: 260px;
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: var(--font-size-base);
    }
    
    .tech-stack {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
        max-width: 360px;
        margin: 0 auto;
    }
    
    .tech-item {
        padding: var(--spacing-sm);
        min-height: 80px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }
    
    .tech-item i {
        font-size: 1.8rem;
        margin-bottom: var(--spacing-xs);
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .section-header {
        margin-bottom: var(--spacing-2xl);
    }
    
    .section-title {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }
    
    .section-description {
        font-size: var(--font-size-base);
    }
    
    .services-grid,
    .tech-items,
    .ai-grid,
    .games-grid,
    .demo-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .service-card,
    .ai-card,
    .game-category,
    .contact-method,
    .demo-card {
        padding: var(--spacing-lg);
    }
    
    .service-icon,
    .ai-icon,
    .game-icon,
    .contact-method-icon {
        width: 60px;
        height: 60px;
        margin-bottom: var(--spacing-md);
    }
    
    .service-icon i,
    .ai-icon i,
    .game-icon i,
    .contact-method-icon i {
        font-size: 1.8rem;
    }
    
    .demo-icon {
        width: 70px;
        height: 70px;
        margin: var(--spacing-lg) auto var(--spacing-md);
    }
    
    .demo-icon i {
        font-size: 1.8rem;
    }
    
    .demo-card h3 {
        font-size: var(--font-size-xl);
    }
    
    .demo-card p {
        font-size: var(--font-size-base);
    }
    
    .demo-note {
        padding: var(--spacing-lg);
    }
    
    .demo-note-icon {
        width: 40px;
        height: 40px;
    }
    
    .demo-note-icon i {
        font-size: 1.2rem;
    }
    
    .tech-showcase {
        gap: var(--spacing-2xl);
    }
    
    .tech-badge {
        padding: var(--spacing-md);
    }
    
    .tech-badge i {
        font-size: 1.8rem;
    }
    
    .platform-features {
        margin-top: var(--spacing-lg);
    }
    
    .feature-item {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
        margin-bottom: var(--spacing-lg);
    }
    
    .feature-item i {
        margin-top: 0;
        font-size: 1.5rem;
    }
    
    .contact-options {
        gap: var(--spacing-md);
    }
    
    .contact-method .btn {
        max-width: 200px;
        font-size: var(--font-size-sm);
    }
    
    .footer-content {
        gap: var(--spacing-lg);
    }
    
    .footer-links {
        gap: var(--spacing-md);
    }
    
    .social-links a {
        width: 40px;
        height: 40px;
    }
    
    .dgs-diagram {
        width: 240px;
        height: 240px;
    }
    
    .dgs-node {
        width: 50px;
        height: 50px;
    }
    
    .dgs-node i {
        font-size: 1.2rem;
    }
    
    .dgs-node span {
        font-size: 0.7rem;
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .btn:hover {
        transform: none;
    }
    
    .service-card:hover,
    .ai-card:hover,
    .game-category:hover,
    .contact-method:hover,
    .tech-badge:hover {
        transform: none;
    }
    
    .nav-link:hover::after {
        width: 0;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .logo {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Print styles */
@media print {
    .header,
    .nav-controls,
    .hero-buttons,
    .contact-options,
    .footer {
        display: none;
    }
    
    .hero {
        min-height: auto;
        padding: var(--spacing-lg) 0;
    }
    
    .section {
        padding: var(--spacing-lg) 0;
        break-inside: avoid;
    }
    
    .service-card,
    .ai-card,
    .game-category {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }