:root {
    --primary: #0d6efd;
    --primary-dark: #0a58ca;
    --secondary: #6c757d;
    --accent: #00b4d8;
    --dark: #1a1a2e;
    --darker: #16213e;
    --light: #f8f9fa;
    --white: #ffffff;
    --text: #333333;
    --text-light: #6c757d;
    --border: #e9ecef;
    --success: #28a745;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.15);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text);
    line-height: 1.6;
    background: var(--white);
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    line-height: 1.3;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(13, 110, 253, 0.3);
}

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

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

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 15px 0;
    transition: var(--transition);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
}

.navbar.scrolled {
    padding: 10px 0;
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: 'Poppins', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 4px;
}

.logo-vk {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

.nav-cta {
    background: var(--primary);
    color: var(--white) !important;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
}

.nav-cta::after {
    display: none;
}

.nav-cta:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 20px 60px;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 80%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(13, 110, 253, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 600px;
    z-index: 1;
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    color: var(--dark);
    margin-bottom: 20px;
}

.highlight {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 16px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 32px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    font-family: 'Poppins', sans-serif;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
}

.hero-visual {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    width: 40%;
    max-width: 500px;
}

.hero-image {
    position: relative;
    width: 100%;
    height: 400px;
}

.floating-card {
    position: absolute;
    background: var(--white);
    padding: 16px 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    animation: float 3s ease-in-out infinite;
}

.floating-card .card-icon {
    font-size: 1.5rem;
}

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

.card-2 {
    top: 45%;
    right: 5%;
    animation-delay: 1s;
}

.card-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    background: rgba(13, 110, 253, 0.1);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    color: var(--dark);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

.about {
    padding: 100px 0;
    background: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 60px;
    align-items: start;
}

.about-text p {
    margin-bottom: 20px;
    font-size: 1.05rem;
}

.about-text .lead {
    font-size: 1.2rem;
    color: var(--text);
}

.about-highlights {
    display: grid;
    gap: 16px;
    margin-top: 30px;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--light);
    border-radius: var(--radius-sm);
}

.highlight-icon {
    color: var(--success);
    font-weight: bold;
}

.profile-card {
    background: linear-gradient(135deg, var(--dark), var(--darker));
    color: var(--white);
    padding: 40px;
    border-radius: var(--radius);
    text-align: center;
    position: sticky;
    top: 100px;
}

.profile-image {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.profile-initials {
    font-size: 3rem;
    font-weight: 700;
    font-family: 'Poppins', sans-serif;
}

.profile-card h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.profile-title {
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 4px;
}

.profile-tagline {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-bottom: 24px;
}

.profile-contact {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.profile-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--white);
    text-decoration: none;
    padding: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 0.9rem;
}

.profile-link:hover {
    background: rgba(255, 255, 255, 0.2);
}

.services {
    padding: 100px 0;
    background: var(--light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.service-card {
    background: var(--white);
    padding: 40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.service-card.featured {
    border: 2px solid var(--primary);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.5rem;
    color: var(--dark);
    margin-bottom: 16px;
}

.service-card > p {
    color: var(--text-light);
    margin-bottom: 24px;
}

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

.service-features li {
    padding: 8px 0;
    padding-left: 28px;
    position: relative;
    color: var(--text);
}

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

.industries-served {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--border);
}

.industries-served h4 {
    margin-bottom: 30px;
    color: var(--text-light);
    font-weight: 500;
}

.industries-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}

.industry-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--white);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
}

.industry-icon {
    font-size: 1.5rem;
}

.projects {
    padding: 100px 0;
    background: var(--white);
}

.project-tabs {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}

.tab-btn {
    padding: 12px 32px;
    border: 2px solid var(--border);
    background: var(--white);
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.tab-btn:hover:not(.active) {
    border-color: var(--primary);
    color: var(--primary);
}

.project-content.hidden {
    display: none;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.project-card {
    background: var(--light);
    padding: 30px;
    border-radius: var(--radius);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.project-category {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 16px;
}

.project-card h4 {
    font-size: 1.15rem;
    color: var(--dark);
    margin-bottom: 12px;
}

.project-card p {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.project-results {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.result-tag {
    background: rgba(13, 110, 253, 0.1);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.certifications {
    padding: 100px 0;
    background: var(--light);
}

.certs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.cert-group {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.cert-group h4 {
    color: var(--primary);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--border);
}

.cert-list {
    list-style: none;
}

.cert-list li {
    padding: 10px 0;
    padding-left: 24px;
    position: relative;
    border-bottom: 1px solid var(--border);
}

.cert-list li:last-child {
    border-bottom: none;
}

.cert-list li::before {
    content: '🏆';
    position: absolute;
    left: 0;
    font-size: 0.9rem;
}

.testimonials {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--dark), var(--darker));
    color: var(--white);
}

.testimonials .section-tag {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent);
}

.testimonials .section-header h2 {
    color: var(--white);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.testimonial-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 30px;
    border-radius: var(--radius);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.testimonial-quote {
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 24px;
    font-style: italic;
    opacity: 0.9;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 16px;
}

.author-avatar {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.author-name {
    font-weight: 600;
}

.author-title {
    font-size: 0.9rem;
    opacity: 0.7;
}

.clients-worked {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.clients-worked h4 {
    font-weight: 400;
    margin-bottom: 24px;
    opacity: 0.8;
}

.client-logos {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.client-name {
    padding: 10px 24px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.contact {
    padding: 100px 0;
    background: var(--white);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 60px;
}

.contact-info {
    background: linear-gradient(135deg, var(--dark), var(--darker));
    color: var(--white);
    padding: 40px;
    border-radius: var(--radius);
}

.contact-info h3 {
    margin-bottom: 30px;
    font-size: 1.5rem;
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-icon {
    font-size: 1.5rem;
}

.contact-item h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--accent);
}

.contact-item a,
.contact-item p {
    color: var(--white);
    text-decoration: none;
    opacity: 0.9;
}

.contact-item a:hover {
    opacity: 1;
    text-decoration: underline;
}

.contact-form {
    background: var(--light);
    padding: 40px;
    border-radius: var(--radius);
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background: var(--white);
}

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

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

.btn-submit {
    width: 100%;
    padding: 16px;
    font-size: 1.1rem;
}

.form-message {
    margin-top: 16px;
    padding: 16px;
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 500;
}

.form-message.success {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success);
}

.form-message.error {
    background: rgba(220, 53, 69, 0.1);
    color: #dc3545;
}

.form-message.hidden {
    display: none;
}

.btn-loader {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: var(--white);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.btn-loader.hidden {
    display: none;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.footer {
    background: var(--dark);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: 16px;
}

.footer-brand p {
    opacity: 0.7;
    max-width: 300px;
}

.footer-links h4,
.footer-services h4 {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

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

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

.footer-links a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.7;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
    color: var(--accent);
}

.footer-services li {
    opacity: 0.7;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.6;
    font-size: 0.9rem;
}

@media (max-width: 1024px) {
    .hero-visual {
        display: none;
    }
    
    .hero-content {
        max-width: 100%;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .profile-card {
        position: static;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    
    .footer-brand p {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 30px 20px;
        gap: 20px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-150%);
        opacity: 0;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .hero {
        padding-top: 100px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .certs-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .project-tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .tab-btn {
        width: 100%;
        max-width: 250px;
    }
}