Start with placement, then move into the right HSK track.
Browse courses by level, scenario, and teaching use case.
Review flashcards, pinyin, mistakes, quizzes, and chengyu together.
A focused product line for scenario-based study card packs.
Search vocabulary, grammar, and durable learning references.
Account, pricing, transfer, and business training stay together.
先用邮箱 magic link 建立 Supabase Auth 闭环，后续再接会员购买、人工开通和学习进度同步。
输入邮箱后，Supabase 会发送一次性登录链接。登录后会员中心可读取你的账号、权益和学习记录。
