Create a minimal square book-cover visual with no text, built around one elegant central concept: a refined floating gateway or portal symbolizing easy entry into spoken Thai. The hero object should feel modern, sculptural, and polished, with subtle Thai-inspired form language in the silhouette, but it must remain clean and international rather than decorative or local-looking. Through the gateway, suggest a soft sense of possibility, clarity, and progress, as if the viewer is entering a simpler path to language learning. The overall cover should feel bright, premium, and highly commercial, suitable for a bestselling beginner language guide. Use a soft pastel Thai-inspired background palette, such as muted coral, pastel saffron, powder blue, dusty teal, and warm cream, blended smoothly in an elegant color-graded backdrop rather than a plain white background. Add depth and richness through the background only, using subtle layered gradients, soft paper-like texture, delicate shadow atmosphere, and restrained tonal variation. Keep the central object clean, sharp, and uncluttered with no weird details, no messy textures, and no artificial rendering artifacts. The final result should feel welcoming, smart, easy, and visually memorable. Aspect ratio 1:1.