*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:#ededed;color:#333}#app-container{max-width:600px;margin:0 auto;background-color:#fff;min-height:100vh;display:flex;flex-direction:column}.chat-list{padding:10px 16px 20px;flex:1}.date-divider{display:flex;align-items:center;justify-content:center;margin:10px 0 20px;color:#999;font-size:12px}.date-divider:before,.date-divider:after{content:"";flex:1;height:1px;background-color:#e5e5e5;margin:0 16px}.bottom-dot-divider{display:flex;align-items:center;justify-content:center;margin:20px 0}.bottom-dot-divider:before,.bottom-dot-divider:after{content:"";flex:1;height:1px;background-color:#e5e5e5;margin:0 16px}.dot{width:4px;height:4px;background-color:#d1d1d1;border-radius:50%}.chat-item{display:flex;margin-bottom:10px}.avatar{width:40px;height:40px;border-radius:4px;margin-right:12px;flex-shrink:0;background-color:#eee;object-fit:cover}.chat-content-wrap{flex:1;min-width:0;border-bottom:1px solid #f0f0f0;padding-bottom:24px}.chat-item:last-child .chat-content-wrap{border-bottom:none}.chat-info{display:flex;justify-content:space-between;margin-bottom:6px}.nickname{font-size:10px;color:#b2b2b2;font-weight:500}.time{font-size:12px;color:#b2b2b2}.message-content{font-size:16px;line-height:1.6;word-wrap:break-word;color:#333}.msg-image{max-width:80%;border-radius:4px;margin-top:6px;display:block}.msg-video-container{position:relative;max-width:60%;margin-top:6px;display:inline-block}.msg-video-poster{width:100%;border-radius:4px;display:block}.play-btn{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:40px;height:40px;background-color:#00000080;border-radius:50%;display:flex;align-items:center;justify-content:center}.play-btn:after{content:"";width:0;height:0;border-top:8px solid transparent;border-bottom:8px solid transparent;border-left:12px solid #fff;margin-left:4px}.video-duration{position:absolute;bottom:6px;right:6px;color:#fff;font-size:11px;background:#0000004d;padding:2px 4px;border-radius:2px}