直式優先系統：為短影音長出來的設計規範
9:16 不是裁切，是從一開始就垂直思維的設計系統。
品牌開始建立直式組件庫：字幕安全區、貼紙位、CTA 帶。
橫式官網再適配，往往會犧牲節奏；先直後橫更順。
字級以手機閱讀為準，桌面只是放大。
測量完播與點擊，回饋到封面構圖規範。
Vertical-First Systems: Design Rules Grown for Short Video
Brands are building vertical component libraries: caption safe zones, sticker slots, CTA bands.
Adapting landscape sites downward often kills rhythm — vertical-first flows better.
Type sized for phones first; desktop is scale-up.
Feed completion and taps back into cover composition rules.