Explanation: Media queries in CSS3 allow you to apply different styles to elements based on the characteristics of the device, such as screen width, height, and orientation, enabling the creation of responsive web designs.

Explanation: The :not() pseudo-class can be used to select all elements except the last one in a list.

Explanation: @media (min-width: 768px) is the correct answer. This media query targets devices with a minimum screen width of 768 pixels, which aligns with the requirement of targeting devices with a specific screen width.

Explanation: The grid-gap property controls the space between grid items in a grid container.

Explanation: Many advanced CSS properties like transform require vendor prefixes (e.g., -webkit-, -moz-, -ms-, -o-) to ensure consistent rendering across different browsers.

Explanation: The display: grid; property is used to create a responsive grid layout in CSS.

Explanation: The aspect-ratio media query with specific values targets devices with a specific aspect ratio, such as 16:9 widescreen monitors.

Explanation: The box-shadow property in CSS3 is used to create shadow effects around an element.

Explanation: Pseudo-classes in CSS3 are used to define special states of an element, such as :hover, :focus, or :active, allowing different styles to be applied based on these states.

Explanation: The selector consists of three tag selectors, one ID selector, and two class selectors, making its specificity value 123.
Calculate Specificity Rule: Start at 0, add 100 for each ID value, add 10 for each class value (or pseudo-class or attribute selector), add 1 for each element selector or pseudo-element, and inline style gets a specificity value of 1000.