/* CSS Reset та типографіка */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Основні кольори */
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-gray: #f8f9fa;
    --medium-gray: #6c757d;
    --dark-gray: #343a40;
    --white: #ffffff;
    
    /* Шрифти */
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 0.875rem;
    --font-size-sm: 1rem;
    --font-size-md: 1.125rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;
    --font-size-xxxl: 2.5rem;
    
    /* Відступи */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Радіус */
    --border-radius: 8px;
    --border-radius-lg: 12px;
    
    /* Тіні */
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);
    
    /* Переходи */
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

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

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

h1 { font-size: var(--font-size-xxxl); }
h2 { font-size: var(--font-size-xxl); }
h3 { font-size: var(--font-size-xl); }

p {
    margin-bottom: var(--spacing-sm);
}

/* Посилання */
a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Кнопки */
.cta-button, .project-link {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--box-shadow);
}

.cta-button:hover, .project-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
    color: var(--white);
}

/* Хедер */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--box-shadow);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
}

.nav-link {
    font-weight: 500;
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: width 0.3s ease;
}

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

/* Гамбургер меню */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    margin: 3px 0;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* Hero секція */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--light-gray), var(--white));
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(52, 152, 219, 0.1) 0%, transparent 70%);
    animation: rotate 20s linear infinite;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

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

.hero-title {
    font-size: var(--font-size-xxxl);
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--medium-gray);
    margin-bottom: var(--spacing-xl);
}

/* Секції */
section {
    padding: var(--spacing-xxl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--primary-color);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--secondary-color);
}

/* Про мене */
.about {
    background: var(--light-gray);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.technologies {
    margin-top: var(--spacing-xl);
}

.tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-sm);
}

.tech-item {
    background: var(--white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    font-weight: 500;
    font-size: var(--font-size-xs);
    transition: var(--transition);
}

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

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

.service-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    border-top: 4px solid var(--secondary-color);
}

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

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

/* Портфоліо */
.portfolio {
    background: var(--light-gray);
}

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

.portfolio-item {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-align: center;
}

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

.portfolio-item h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.portfolio-item .project-link {
    margin-top: var(--spacing-sm);
}

/* Контакти */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    max-width: 800px;
    margin: 0 auto;
}

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

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

.contact-label {
    font-weight: 600;
    color: var(--primary-color);
}

.contact-value {
    color: var(--secondary-color);
    font-weight: 500;
}

.contact-cta {
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
}

/* Футер */
.footer {
    background: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: var(--spacing-lg) 0;
}

/* Responsive дизайн */
@media (max-width: 768px) {
    :root {
        --font-size-xxxl: 2rem;
        --font-size-xxl: 1.5rem;
        --spacing-xxl: 2rem;
        --spacing-xl: 1.5rem;
    }
    
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--box-shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        transition: var(--transition);
        pointer-events: none;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .hero {
        height: 80vh;
        padding: 0 var(--spacing-sm);
    }
    
    .services-grid,
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .tech-list {
        justify-content: center;
    }
    
    .about-content,
    .contact-content {
        padding: 0 var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-xs);
    }
    
    .hero-title {
        font-size: var(--font-size-xxl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-sm);
    }
    
    .service-card,
    .portfolio-item {
        padding: var(--spacing-sm);
    }
}

/* Анімації появи */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* Focus states */
a:focus,
button:focus {
    outline: 2px solid var(--secondary-color);
    outline-offset: 2px;
}