Friend Invite Campaign Banner AI Image Prompt

A wide Japanese promotional web banner/social ad with 3:1 aspect ratio, 1200x480. Deep navy to near-black solid gradient background, thin bright green line along the very top and bottom edges. Clean flat vector UI style, corporate delivery service ad, high contrast typography. Brand at top-left: small rounded green square icon with white downward triangle, next to bold white lowercase wordmark. Text lines: 'menu' and '配達クルー'. Layout sections: 1. Brand block (upper left) - green app icon and white menu/配達クルー logo text; 2. Reward amount block (left middle) - small yellow text '最大', large yellow amount 15,000, yellow yen symbol below with green-and-white check/leaf accent; 3. Main campaign message (upper center) - large white headline '友達招待キャンペーン', smaller white subheadline '今なら紹介する人もされる人も', green emphasis line 'それぞれ15,000円ゲット！'; 4. Invite code card (center lower) - large red rounded rectangle, white label '招待コード' and bold code RKE247; 5. Eligibility/date block (upper right) - green rounded pill '東京・神奈川限定', small white text '20回配達でボーナス', white date range 2026/4/27〜5/31. Decorations: small gray X close icon in extreme top-right, thin dark outlined irregular pentagon on right side, small flat green delivery truck icon with dark wheels near lower-right. Typography: bold Japanese sans-serif white headline, extra-large bold sans-serif yellow numbers, clean sans-serif white and green body. Color palette: navy #070d1d, green #00a86b, yellow #ffc928, red #e72727, white #ffffff, gray #2b3140. Text content: headline {argument: headline text, default: 友達招待キャンペーン}, subheadline {argument: subheadline text, default: 今なら紹介する人もされる人も}, reward_text {argument: reward amount, default: 15,000円}, invite_code {argument: invite code, default: RKE247}, region_offer {argument: region offer text, default: 東京・神奈川限定 20回配達でボーナス}. Composition notes: Keep banner airy with most elements aligned to upper half, strong negative space in bottom center, crisp vector shapes, no people, no photo realism, preserve exact Japanese text placement and color hierarchy.