Japanese Tech App Promotional Banner

A polished Japanese tech advertising banner for a mobile app, widescreen 16:9 composition. The background features a futuristic deep blue-to-purple gradient filled with glowing network lines, connection nodes, subtle digital particles, and soft lens flares. At the top center, display an app logo consisting of a cyan hexagon icon containing large white letters "SC" with an integrated circuit pattern inside the "C", accompanied by the brand typography "SKILL Cert by AI" in a modern sans-serif font ("SKILL" large in black, "Cert" below in black, and "by AI" in small cyan text). In the upper center, render a bold Japanese headline in large white text with a dark navy outline and soft drop shadow: "[AIが出題する資格バトルアプリ]". Directly beneath, display a subheadline in medium-large white Japanese text with the same outline and shadow: "[200以上の資格でオンライン対戦]". Centered in the mid-foreground, place a glossy rounded rectangular call-to-action button in bright cyan with subtle bevel and shadow, inscribed with bold white Japanese text: "[今すぐ無料で対戦]". Arrange exactly three smartphone mockups around the center: one on the lower left tilted slightly right showing a leaderboard UI with top line chart and ranking list; one large phone on the lower right tilted slightly left displaying a quiz interface with multiple-choice radio buttons; and one smaller phone on the far right edge angled inward displaying a dark analytics dashboard with charts. Add four floating semi-transparent UI elements in the background: an analytics line-chart card on the upper left, a holographic dashboard cluster on the upper right, a glowing wireframe neural sphere behind the button, and a hexagonal stat card on the right center. Clean AI SaaS and edtech visual branding, crisp typography, layered depth, and neon glow accents.