Chinese Tea Drink Product Launch Poster

Design a 3:4 vertical poster for a new artisan tea drink launch. Brand name: "Mountain River Tea". Style: New Chinese aesthetic, light luxury, restrained. Colors: dark green, off-white, gold. Incorporate rice paper texture, negative space, elegant landscapes, modern layout design. Main subject: a visually appealing cold brew tea with tea leaves, citrus, ice cubes, and gold foil elements. The poster must accurately display this text hierarchy: brand name, product name, series name, launch tagline, limited-time price (medium and large sizes), in-store promotions, flavor descriptors, campaign dates, and QR code section. Requirements: Clear promotional hierarchy while maintaining sophistication, not cheap e-commerce style. Focus on small text, numbers, prices, info modules, and Chinese font aesthetics.