.container {
    
    margin: 0 auto;
    padding: 20px;
}



.header {
    background: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 0;
    
}

a {
    text-decoration: none;
}

.nav a {
    margin-left: 2rem;
    text-decoration: none;
    color: #555;
    transition: color 0.3s;
}

.nav a:hover {
    color: #3498db;
}

.video-wrapper {
    position: relative;
    padding-bottom: 36%;
    overflow: hidden;
    max-width: 800px;
    margin: 0 auto 30px;
}

.video {
    position: absolute;
    
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    border-radius: 8px;
}


.link-section {
    text-align: center;
}

.link-section p {
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.material-link {
    display: inline-block;
    padding: 12px 24px;
    background-color: #3498db;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
    transition: background-color 0.3s ease;
    margin: 0 auto 30px;
}

.material-link:hover {
    background-color: #2980b9;
}



/* Адаптация для мобильных устройств (до 767px) */
@media (max-width: 767px) {
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 1.5rem;
        margin-bottom: 20px;
    }
    
    .video-wrapper {
        max-width: 500px;
    }
    
    .link-section p {
        font-size: 1rem;
    }
    
    .material-link {
        padding: 10px 20px;
        font-size: 0.9rem;
    }
}

/* Дополнительная адаптация для очень маленьких экранов (до 480px) */
@media (max-width: 480px) {
    h1 {
        font-size: 1.3rem;
    }
    
    .material-link {
        width: 400px;
        text-align: center;
    }
}