Banner Promosi Aplikasi AI Jepang

Create a polished Japanese tech advertising banner for a mobile app, widescreen 16:9, with a futuristic blue-to-purple gradient background filled with glowing network lines, connection nodes, soft lens flares, and subtle digital particles. At the top center, place a modern app logo: a cyan hexagon icon with large white letters “SC” and a small circuit symbol inside the C, followed by the brand text “SKILL Cert by AI” in a clean sans-serif font, with “SKILL” large and black, “Cert” below it in black, and “by AI” smaller in cyan. Center the composition around a bold Japanese headline in very large white text with a dark navy outline and soft drop shadow: {argument name="headline text" default="AIが出題する資格バトルアプリ"}. Directly below, add a second line of medium-large white Japanese text with the same outline and shadow: {argument name="subheadline text" default="200以上の資格でオンライン対戦"}. In the middle foreground, place one large glossy rounded rectangular call-to-action button in bright cyan with subtle gradient, bevel, and shadow, containing bold white Japanese text: {argument name="button text" default="今すぐ無料で対戦"}. Show exactly 3 smartphone mockups arranged around the center: 1 on the lower left, tilted slightly right, showing a leaderboard app screen with a line graph at the top, small profile avatars, ranking rows, and Japanese UI labels; 1 large phone on the lower right, tilted slightly left, showing a multiple-choice quiz screen with Japanese question text and radio-button answers plus a cyan bottom button; 1 smaller phone on the far right edge, angled inward, showing a darker dashboard-style screen with charts and Japanese text. Add exactly 4 floating UI graphic clusters in the background: 1 analytics line-chart panel near the upper left, 1 holographic cube/dashboard cluster near the upper right, 1 glowing wireframe brain or neural sphere near the lower left-center behind the button, and 1 hexagon chart/card element near the right-center. Use a sleek AI, SaaS, and edtech marketing aesthetic, high contrast, crisp typography, layered depth, neon glow accents, and premium app-promo lighting.