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768px){.detail-header{flex-wrap:wrap}.header-actions{width:100%}.action-btn{flex:1}.video-list{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px}.select-toolbar{flex-wrap:wrap}.selected-count{order:3;width:100%;margin-top:8px}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft 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