Create a Vietnamese historical YouTube thumbnail poster for the story of Trần Nguyên Hãn. 16:9 horizontal thumbnail composition, title text: "TRẦN NGUYÊN HÃN". Epic parchment and ink historical calligraphy poster style, sepia bronze gold palette, heroic Vietnamese Lam Sơn general portrait, early 15th-century Đại Việt armor and robe, bamboo flags and smoky battlefield atmosphere, dark vertical ink title panel, large gold Vietnamese brush calligraphy title, antique painterly texture, dramatic contrast, premium historical documentary look. Use the reference image only for design language, calligraphy poster style, ink/parchment palette, and title-panel composition; do not copy unrelated identity. Negative: no modern objects, no photorealism, no anime, no 3D, no watermark, no logo, no extra text, no misspelled text, no European armor, no Chinese imperial robe.