Age Verification Popup

Generate the Liquid, CSS, and JavaScript for an age verification popup section that I can paste into my theme as a custom section — a fullscreen overlay modal that displays when a visitor first arrives on the store. The popup should block access to the site content until the visitor confirms they are at least [MINIMUM_AGE] years old. The modal should display a logo using an image_picker setting, a heading [POPUP_HEADING], a description paragraph [POPUP_DESCRIPTION], and two buttons: Confirm (I am [MINIMUM_AGE] or older) with background color [CONFIRM_BG_COLOR] and Deny (I am under [MINIMUM_AGE]) with background color [DENY_BG_COLOR]. If the visitor clicks Confirm, set a cookie named [COOKIE_NAME] with an expiry of [COOKIE_EXPIRY_DAYS] days and close the overlay. If the visitor clicks Deny, redirect them to [DENY_REDIRECT_URL]. The overlay background should use color [OVERLAY_BG_COLOR] with opacity [OVERLAY_OPACITY]. The modal card should have background color [MODAL_BG_COLOR], text color [MODAL_TEXT_COLOR], border radius [BORDER_RADIUS] pixels, max-width [MODAL_MAX_WIDTH] pixels, and padding [MODAL_PADDING] pixels. The popup should not display in the Shopify theme editor preview so merchants can work on the theme freely. Include a setting to enable or disable the popup globally. Provide complete Liquid, CSS, and JavaScript with no external dependencies. Finally, tell me exactly which section file to create and how to add it to my theme via the Shopify theme editor — and note that I should have legal counsel confirm the age-gate wording meets local regulations before publishing.