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Warm earth tones (sienna and gold) dominate, with cool teal highlights on trade routes for contrast. Lighting focuses on the archer and the brightest point of the trade map, guiding the eye. Ample empty space in the top third allows course title overlay. Mood is dynamic yet scholarly, inviting teens to discover the interconnected world forged by Mongol conquest.","tradeoffs":[],"image_url":"https://course-builder-course-thumbnails.s3.us-east-1.amazonaws.com/courses/course_1764098993/thumbnail.png","generation_progress":100.0,"all_concepts_covered":["pre_mongol_eurasia","genghis_rise","mongol_military","mongol_khanates","mongol_trade","mongol_technology_transfers","mongol_cultural_transfers","mongol_decline","other_empire_networks"],"generation_error":null,"rejected_segments_rationale":"Higher-ranked duplicates (e.g., additional Temujin rise clips) were omitted to avoid redundancy. 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