*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Roboto,Helvetica,Arial,sans-serif;color:#111827;-webkit-font-smoothing:antialiased}#app{height:100%}.static-gradient-bg{position:fixed;top:0;right:0;bottom:0;left:0;z-index:0;pointer-events:none;background:linear-gradient(to bottom,#ede9fe,#f5f3ff)}.chat-layout{position:relative;z-index:1;display:flex;width:100%;height:100vh;overflow:hidden}.chat-main{flex:1;display:flex;flex-direction:column;overflow:hidden;min-width:0}.chat-header{padding:16px 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