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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

header {
    background: rgba(0, 0, 0, 0.3);
    color: white;
    padding: 2rem 0;
    position: relative;
}

.header-content {
    text-align: center;
}

.header-text {
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.language-switcher {
    position: absolute;
    top: 2rem;
    right: 2rem;
    display: flex;
    gap: 0;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    padding: 4px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.lang-btn {
    background: transparent;
    color: rgba(255, 255, 255, 0.8);
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    letter-spacing: 0.5px;
}

.lang-btn:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.lang-btn.active {
    background: white;
    color: #667eea;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

main {
    padding: 2rem 0;
}

section {
    background: white;
    border-radius: 20px;
    padding: 3rem 2rem;
    margin: 2rem auto;
    max-width: 1200px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.hero {
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn-download {
    display: inline-block;
    background: white;
    color: #667eea;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.1rem;
    transition: transform 0.3s ease;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.features h3 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: #667eea;
}

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

.feature {
    padding: 1.5rem;
    border-radius: 10px;
    background: #f8f9fa;
    transition: transform 0.3s ease;
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.feature h4 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #667eea;
}

.download {
    text-align: center;
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
    color: white;
}

.download h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.download p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

footer {
    background: rgba(0, 0, 0, 0.3);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
}

footer a {
    color: white;
    text-decoration: underline;
}

@media (max-width: 768px) {
    header {
        padding: 1.5rem 0 2.5rem 0;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .language-switcher {
        top: 1rem;
        right: 1rem;
        padding: 3px;
        gap: 0;
    }
    
    .lang-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .hero h2 {
        font-size: 1.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}