/* ============================================
   VND Solutions - Modern One-Page Website
   ============================================ */

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

:root {
    /* Color Palette */
    --primary-color: #0066ff;
    --primary-dark: #0052cc;
    --primary-light: #3385ff;
    --secondary-color: #00d4ff;
    --accent-color: #7c3aed;
    --text-dark: #1a1a1a;
    --text-light: #666666;
    --text-lighter: #999999;
    --bg-white: #ffffff;
    --bg-light: #f8f9fa;
    --bg-dark: #0a0e27;
    --gradient-1: linear-gradient(135deg, #0066ff 0%, #00d4ff 100%);
    --gradient-2: linear-gradient(135deg, #7c3aed 0%, #0066ff 100%);
    --gradient-3: linear-gradient(135deg, #00d4ff 0%, #7c3aed 100%);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    --spacing-xxl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 700;
    font-size: 1.25rem;
    font-family: var(--font-heading);
}

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

.logo-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
    padding: var(--spacing-xs) 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-1);
    transition: var(--transition-normal);
}

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

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 3px;
    transition: var(--transition-normal);
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

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

.gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-1);
    opacity: 0.05;
}

.animated-shapes {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 500px;
    height: 500px;
    background: var(--primary-color);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.shape-2 {
    width: 400px;
    height: 400px;
    background: var(--secondary-color);
    bottom: -150px;
    left: -150px;
    animation-delay: 5s;
}

.shape-3 {
    width: 300px;
    height: 300px;
    background: var(--accent-color);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-normal);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-1);
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

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

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

.ai-visualization {
    position: relative;
    width: 500px;
    height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* AI Core Brain */
.ai-core {
    position: absolute;
    width: 180px;
    height: 180px;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.core-pulse {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--gradient-1);
    opacity: 0.3;
    animation: corePulse 2s infinite ease-in-out;
}

.core-inner {
    position: relative;
    width: 120px;
    height: 120px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 40px rgba(0, 102, 255, 0.3), 0 0 80px rgba(0, 212, 255, 0.2);
    animation: coreRotate 8s infinite linear;
}

.core-inner::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--gradient-1);
    opacity: 0.1;
    animation: corePulse 2s infinite ease-in-out;
    animation-delay: 1s;
}

.core-inner i {
    font-size: 3.5rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    z-index: 1;
}

@keyframes corePulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.3;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.6;
    }
}

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

/* Neural Network Nodes */
.neural-network {
    position: absolute;
    width: 100%;
    height: 100%;
}

.neural-node {
    position: absolute;
    width: 20px;
    height: 20px;
    background: var(--gradient-1);
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(0, 102, 255, 0.6);
    animation: nodePulse 2s infinite ease-in-out;
}

.neural-node.node-1 {
    top: 10%;
    left: 20%;
    animation-delay: 0s;
}

.neural-node.node-2 {
    top: 15%;
    right: 15%;
    animation-delay: 0.2s;
}

.neural-node.node-3 {
    top: 50%;
    left: 5%;
    animation-delay: 0.4s;
}

.neural-node.node-4 {
    top: 50%;
    right: 5%;
    animation-delay: 0.6s;
}

.neural-node.node-5 {
    bottom: 20%;
    left: 20%;
    animation-delay: 0.8s;
}

.neural-node.node-6 {
    bottom: 15%;
    right: 20%;
    animation-delay: 1s;
}

.neural-node.node-7 {
    top: 30%;
    left: 50%;
    transform: translateX(-50%);
    animation-delay: 1.2s;
}

.neural-node.node-8 {
    bottom: 30%;
    left: 50%;
    transform: translateX(-50%);
    animation-delay: 1.4s;
}

@keyframes nodePulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.8;
    }
    50% {
        transform: scale(1.5);
        opacity: 1;
    }
}

/* Neural Connections */
.neural-connection {
    position: absolute;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    opacity: 0.4;
    animation: connectionFlow 3s infinite;
    transform-origin: left center;
}

.conn-1 {
    top: 12%;
    left: 30%;
    width: 200px;
    transform: rotate(-20deg);
    animation-delay: 0s;
}

.conn-2 {
    top: 18%;
    right: 25%;
    width: 180px;
    transform: rotate(25deg);
    animation-delay: 0.3s;
}

.conn-3 {
    top: 52%;
    left: 15%;
    width: 150px;
    transform: rotate(45deg);
    animation-delay: 0.6s;
}

.conn-4 {
    top: 52%;
    right: 15%;
    width: 150px;
    transform: rotate(-45deg);
    animation-delay: 0.9s;
}

.conn-5 {
    bottom: 22%;
    left: 30%;
    width: 200px;
    transform: rotate(20deg);
    animation-delay: 1.2s;
}

.conn-6 {
    bottom: 18%;
    right: 30%;
    width: 180px;
    transform: rotate(-25deg);
    animation-delay: 1.5s;
}

.conn-7 {
    top: 32%;
    left: 50%;
    width: 100px;
    transform: translateX(-50%) rotate(90deg);
    animation-delay: 1.8s;
}

.conn-8 {
    bottom: 32%;
    left: 50%;
    width: 100px;
    transform: translateX(-50%) rotate(-90deg);
    animation-delay: 2.1s;
}

@keyframes connectionFlow {
    0%, 100% {
        opacity: 0.2;
        transform: scaleX(0.8);
    }
    50% {
        opacity: 0.8;
        transform: scaleX(1);
    }
}

/* Data Streams */
.data-streams {
    position: absolute;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.stream {
    position: absolute;
    width: 3px;
    height: 100px;
    background: var(--gradient-1);
    opacity: 0.6;
    border-radius: 2px;
    animation: streamFlow 4s infinite linear;
}

.stream-1 {
    left: 20%;
    top: -100px;
    animation-delay: 0s;
}

.stream-2 {
    left: 50%;
    top: -100px;
    animation-delay: 1.3s;
}

.stream-3 {
    right: 20%;
    top: -100px;
    animation-delay: 2.6s;
}

@keyframes streamFlow {
    0% {
        transform: translateY(0) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 0.8;
    }
    90% {
        opacity: 0.8;
    }
    100% {
        transform: translateY(600px) rotate(360deg);
        opacity: 0;
    }
}

/* AI Particles */
.ai-particles {
    position: absolute;
    width: 100%;
    height: 100%;
}

.particle {
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--secondary-color);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--secondary-color);
    animation: particleFloat 8s infinite ease-in-out;
}

.particle:nth-child(1) {
    top: 20%;
    left: 30%;
    animation-delay: 0s;
}

.particle:nth-child(2) {
    top: 40%;
    right: 25%;
    animation-delay: 1.5s;
}

.particle:nth-child(3) {
    bottom: 30%;
    left: 40%;
    animation-delay: 3s;
}

.particle:nth-child(4) {
    top: 60%;
    left: 20%;
    animation-delay: 4.5s;
}

.particle:nth-child(5) {
    bottom: 20%;
    right: 30%;
    animation-delay: 6s;
}

@keyframes particleFloat {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.6;
    }
    25% {
        transform: translate(30px, -40px) scale(1.2);
        opacity: 1;
    }
    50% {
        transform: translate(-20px, -60px) scale(0.8);
        opacity: 0.8;
    }
    75% {
        transform: translate(40px, -30px) scale(1.1);
        opacity: 1;
    }
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
    color: var(--primary-color);
    font-size: 1.5rem;
}

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

/* ============================================
   Services Section
   ============================================ */

.services {
    padding: var(--spacing-xxl) 0;
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.service-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-1);
    transform: scaleX(0);
    transition: var(--transition-normal);
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-1);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

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

.service-title {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.service-description {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

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

.service-features li {
    padding: var(--spacing-xs) 0;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.service-features i {
    color: var(--primary-color);
    font-size: 0.875rem;
}

/* ============================================
   About Section
   ============================================ */

.about {
    padding: var(--spacing-xxl) 0;
    background: white;
}

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

.about-description {
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
    font-size: 1.0625rem;
}

.about-stats {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
}

.tech-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.tech-item {
    background: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: 15px;
    text-align: center;
    transition: var(--transition-normal);
}

.tech-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.tech-item i {
    font-size: 2.5rem;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.tech-item span {
    display: block;
    color: var(--text-dark);
    font-weight: 500;
}


/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--bg-dark);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.footer-logo-img {
    height: 40px;
    width: auto;
}

.footer-logo-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.footer-title {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: white;
}

.company-details p,
.footer-address p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-xs);
    line-height: 1.8;
}

.footer-contact-section .footer-title {
    color: white;
}

.footer-address a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition-fast);
}

/* Futuristic AI-based Contact Section */
.footer-contact-section {
    position: relative;
}

.footer-contact-section .footer-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    position: relative;
}

.title-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--gradient-1);
    border-radius: 8px;
    animation: iconRotate 4s infinite linear;
}

.title-icon i {
    font-size: 1rem;
    color: white;
}

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

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

.contact-card {
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, rgba(0, 212, 255, 0.05) 100%);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 12px;
    padding: var(--spacing-md);
    position: relative;
    overflow: hidden;
    transition: var(--transition-normal);
    backdrop-filter: blur(10px);
}

.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.1), transparent);
    transition: var(--transition-slow);
}

.contact-card:hover::before {
    left: 100%;
}

.contact-card:hover {
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
    transform: translateY(-2px);
}

.contact-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.contact-icon-wrapper {
    position: relative;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-1);
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0, 102, 255, 0.4);
}

.contact-icon-wrapper i {
    color: white;
    font-size: 1.125rem;
    z-index: 1;
}

.icon-pulse {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 10px;
    background: var(--primary-color);
    opacity: 0.6;
    animation: iconPulse 2s infinite ease-in-out;
}

@keyframes iconPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.3;
    }
}

.contact-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.9);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition-normal);
    padding: var(--spacing-xs);
    border-radius: 8px;
    position: relative;
}

.contact-link:hover {
    color: var(--secondary-color);
    background: rgba(0, 212, 255, 0.1);
}

.contact-link i {
    font-size: 0.875rem;
    opacity: 0.7;
    transition: var(--transition-fast);
}

.contact-link:hover i {
    opacity: 1;
    transform: translateX(5px);
}

.contact-value {
    font-family: 'Courier New', monospace;
    letter-spacing: 0.5px;
}

/* Phone Grid */
.phone-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.phone-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 10px;
    text-decoration: none;
    color: rgba(255, 255, 255, 0.9);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.phone-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.2), transparent);
    transition: var(--transition-slow);
}

.phone-link:hover::before {
    left: 100%;
}

.phone-link:hover {
    background: rgba(0, 212, 255, 0.15);
    border-color: rgba(0, 212, 255, 0.5);
    transform: translateX(5px);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.3);
}

.country-flag {
    font-size: 1.5rem;
    filter: drop-shadow(0 0 5px rgba(0, 212, 255, 0.5));
}

.phone-details {
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 2px;
}

.country-code {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.phone-number {
    font-size: 0.875rem;
    font-weight: 500;
    font-family: 'Courier New', monospace;
    color: rgba(255, 255, 255, 0.9);
    letter-spacing: 0.5px;
}

.phone-link i {
    font-size: 1rem;
    opacity: 0.6;
    transition: var(--transition-fast);
}

.phone-link:hover i {
    opacity: 1;
    color: var(--secondary-color);
    transform: scale(1.2);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

/* ============================================
   Scroll to Top Button
   ============================================ */

.scroll-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background: var(--gradient-1);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
    z-index: 999;
}

.scroll-top.visible {
    display: flex;
}

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 968px) {
    .hero-content,
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: white;
        width: 100%;
        text-align: center;
        transition: var(--transition-normal);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-lg) 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
}

@media (max-width: 768px) {
    .phone-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .about-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .contact-card {
        padding: var(--spacing-sm);
    }
    
    .contact-card-header {
        gap: var(--spacing-xs);
    }
    
    .phone-link {
        padding: var(--spacing-xs);
    }
    
    .country-flag {
        font-size: 1.25rem;
    }
    
    .phone-number {
        font-size: 0.8125rem;
    }
    
    .ai-visualization {
        width: 100%;
        max-width: 350px;
        height: 350px;
    }
    
    .ai-core {
        width: 140px;
        height: 140px;
    }
    
    .core-inner {
        width: 100px;
        height: 100px;
    }
    
    .core-inner i {
        font-size: 2.5rem;
    }
    
    .neural-node {
        width: 15px;
        height: 15px;
    }
}