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

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --accent: #0d6efd;
    --accent-hover: #0b5ed7;
    --border: #dee2e6;
    --shadow: rgba(0, 0, 0, 0.1);
    --card-bg: #ffffff;
}

body.dark {
    --bg-primary: #212529;
    --bg-secondary: #343a40;
    --text-primary: #f8f9fa;
    --text-secondary: #adb5bd;
    --accent: #0d6efd;
    --accent-hover: #3d8bfd;
    --border: #495057;
    --shadow: rgba(255, 255, 255, 0.1);
    --card-bg: #2d3338;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand a {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
    text-decoration: none;
}

.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.navbar-menu ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.navbar-menu ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.navbar-menu ul li a:hover,
.navbar-menu ul li.active a {
    color: var(--accent);
}

.navbar-actions {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.theme-toggle:hover {
    background-color: var(--bg-primary);
}

.lang-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lang-selector i {
    color: var(--text-secondary);
}

.lang-selector select {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    cursor: pointer;
}

.main-content {
    min-height: calc(100vh - 200px);
    padding: 3rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero {
    text-align: center;
    padding: 3rem 0;
    margin-bottom: 3rem;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.hero p {
    font-size: 1.3rem;
    color: var(--text-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.service-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--shadow);
}

.service-card i {
    font-size: 3rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.service-card p {
    color: var(--text-secondary);
}

.features {
    margin-bottom: 3rem;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-item {
    text-align: center;
    padding: 1.5rem;
}

.feature-item i {
    font-size: 2.5rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.feature-item h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

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

.content {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    text-align: center;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.footer-social a {
    color: var(--text-secondary);
    font-size: 1.5rem;
    transition: color 0.3s;
}

.footer-social a:hover {
    color: var(--accent);
}

footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }
    
    .navbar-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--bg-secondary);
        flex-direction: column;
        padding: 2rem;
        transition: left 0.3s;
    }
    
    .navbar-menu.active {
        left: 0;
    }
    
    .navbar-menu ul {
        flex-direction: column;
        width: 100%;
    }
    
    .navbar-menu ul li {
        width: 100%;
        text-align: center;
        padding: 1rem 0;
    }
    
    .navbar-actions {
        width: 100%;
        justify-content: center;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1.1rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}