/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #10b981;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --text-white: #ffffff;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --bg-dark: #111827;
    --border-color: #e5e7eb;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Spacing */
    --container-width: 1200px;
    --section-padding: 80px;
    --card-radius: 16px;
    --button-radius: 8px;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --line-height-tight: 1.2;
    --line-height-normal: 1.6;
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-primary);
    line-height: var(--line-height-normal);
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
    width: 100%;
    max-width: 100vw;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* ===== ACCESSIBILITY ===== */
/* Focus states for keyboard navigation */
a:focus-visible,
button:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Skip link for screen readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: var(--text-white);
    padding: 8px 16px;
    z-index: 10000;
    transition: top var(--transition-fast);
}

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

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: var(--line-height-tight);
    margin: 0;
}

h1 {
    font-size: clamp(2rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.125rem, 3vw, 1.25rem);
}

p {
    color: var(--text-light);
    margin: 0;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-normal);
}

ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--button-radius);
    cursor: pointer;
    transition: var(--transition-normal);
    border: 2px solid transparent;
    text-transform: none;
    max-width: 100%;
    white-space: nowrap;
}

.btn:focus-visible {
    outline-offset: 3px;
}

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

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

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

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

.btn-lg {
    padding: 14px 32px;
    font-size: 1rem;
}

/* ===== HEADER ===== */
.header {
    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;
    padding: 15px 0;
    width: 100%;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    gap: 16px;
}

.logo {
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary-color);
}

.logo-tagline {
    font-size: 0.65rem;
    color: var(--text-light);
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-menu a {
    color: var(--text-dark);
    font-weight: 500;
    position: relative;
    white-space: nowrap;
}

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 2px;
    transition: var(--transition-normal);
}

/* Mobile menu animation */
.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== HERO ===== */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-white);
    position: relative;
    overflow: hidden;
    width: 100%;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    max-width: 600px;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-30px, 30px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    width: 100%;
}

.hero-title {
    margin-bottom: 20px;
    color: var(--text-white);
}

.gradient-text {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
    max-width: 700px;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 40px;
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.1);
    padding: 12px 16px;
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

.feature-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.feature-text {
    font-weight: 600;
    color: var(--text-white);
    font-size: 0.9rem;
}

/* ===== SECTIONS ===== */
section {
    padding: var(--section-padding) 0;
    width: 100%;
}

.section-title {
    text-align: center;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.section-subtitle {
    text-align: center;
    margin-bottom: 48px;
    color: var(--text-light);
    font-size: 1rem;
}

/* ===== SERVICES ===== */
.services {
    background: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    width: 100%;
    max-width: 100%;
}

.service-card {
    background: var(--bg-white);
    padding: 24px;
    border-radius: var(--card-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 100%;
    overflow-wrap: break-word;
    word-wrap: break-word;
    word-break: break-word;
}

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

.service-card-highlight {
    border: 2px solid var(--primary-color);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(37, 99, 235, 0.02) 100%);
}

.service-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.service-title {
    margin-bottom: 16px;
    color: var(--text-dark);
}

.service-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.service-list li {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
    padding: 10px;
    background: var(--bg-light);
    border-radius: 8px;
    color: var(--text-dark);
    flex-wrap: wrap;
}

.price {
    color: var(--primary-color);
    font-weight: 600;
    white-space: nowrap;
    flex-shrink: 0;
}

/* ===== ADVANTAGES ===== */
.advantages {
    background: var(--bg-white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    width: 100%;
    max-width: 100%;
}

.advantage-card {
    text-align: center;
    padding: 24px;
    background: var(--bg-light);
    border-radius: var(--card-radius);
    transition: var(--transition-normal);
    width: 100%;
    max-width: 100%;
}

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

.advantage-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.advantage-title {
    margin-bottom: 12px;
    color: var(--text-dark);
}

.advantage-description {
    color: var(--text-light);
    line-height: var(--line-height-normal);
    font-size: 0.95rem;
}

/* ===== TECHNOLOGIES ===== */
.technologies {
    background: var(--bg-dark);
    color: var(--text-white);
}

.technologies .section-title,
.technologies .section-subtitle {
    color: var(--text-white);
}

.tech-categories {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.tech-category-title {
    font-size: 1.25rem;
    margin-bottom: 16px;
    color: var(--text-white);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tech-tag {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-white);
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 500;
    transition: var(--transition-normal);
    font-size: 0.9rem;
    border: 1px solid transparent;
}

.tech-tag:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    border-color: var(--primary-light);
}

/* ===== COOPERATION ===== */
.cooperation {
    background: var(--bg-light);
}

.cooperation-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 48px;
    width: 100%;
    max-width: 100%;
}

.cooperation-step {
    text-align: center;
    padding: 20px;
}

.step-number {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 auto 16px;
}

.step-title {
    margin-bottom: 10px;
    color: var(--text-dark);
    font-size: 1rem;
}

.step-description {
    color: var(--text-light);
    font-size: 0.85rem;
}

.cooperation-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    width: 100%;
    max-width: 100%;
}

.info-card {
    background: var(--bg-white);
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.info-card h4 {
    margin-bottom: 12px;
    color: var(--text-dark);
    font-size: 1.1rem;
}

.info-card ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.info-card li {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    color: var(--text-light);
    font-size: 0.9rem;
}

.info-card li::before {
    content: '✓';
    color: var(--secondary-color);
    font-weight: 700;
    flex-shrink: 0;
}

/* ===== CTA ===== */
.cta {
    padding: 60px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-white);
    text-align: center;
}

.cta-title {
    font-size: 2rem;
    margin-bottom: 12px;
    color: var(--text-white);
}

.cta-subtitle {
    font-size: 1rem;
    margin-bottom: 32px;
    opacity: 0.9;
    color: var(--text-white);
}

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

.cta .btn-primary:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
}

/* ===== CONTACTS ===== */
.contacts {
    background: var(--bg-white);
}

.contacts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    width: 100%;
    max-width: 100%;
}

.contact-card {
    text-align: center;
    padding: 24px;
    background: var(--bg-light);
    border-radius: var(--card-radius);
    transition: var(--transition-normal);
    width: 100%;
    max-width: 100%;
}

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

.contact-icon {
    font-size: 2rem;
    margin-bottom: 16px;
}

.contact-title {
    margin-bottom: 12px;
    color: var(--text-dark);
}

.contact-link,
.contact-text {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1rem;
}

.contact-subtitle {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 6px;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: 32px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-logo .logo-text {
    color: var(--text-white);
}

.footer-logo .logo-tagline {
    color: rgba(255, 255, 255, 0.7);
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    :root {
        --container-width: 960px;
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --container-width: 100%;
        --section-padding: 60px;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-white);
        flex-direction: column;
        padding: 16px;
        gap: 16px;
        box-shadow: var(--shadow-lg);
        z-index: 999;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav .btn {
        display: none;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-features {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .cooperation-steps {
        grid-template-columns: 1fr;
    }
    
    .cooperation-info {
        grid-template-columns: 1fr;
    }
    
    .contacts-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    :root {
        --section-padding: 48px;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 0.95rem;
    }
    
    .btn-lg {
        padding: 12px 24px;
        font-size: 0.95rem;
    }
    
    .service-card {
        padding: 20px;
    }
    
    .feature-item {
        padding: 10px 12px;
    }
    
    .container {
        padding: 0 16px;
    }
    
    .info-card {
        padding: 20px;
    }
}