:root{--wx-bg: #ededed;--wx-green: #07c160;--wx-bubble-user: #95ec69;--wx-bubble-bot: #ffffff;--wx-header: #ededed;--wx-text: #181818;--wx-muted: #888;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body,#app{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Helvetica Neue,Microsoft YaHei,system-ui,sans-serif;background:var(--wx-bg);color:var(--wx-text);font-size:16px;line-height:1.5;overscroll-behavior-y:none}.app{display:flex;flex-direction:column;height:100dvh;max-width:640px;margin:0 auto;background:var(--wx-bg)}.header{flex:0 0 auto;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:calc(8px + var(--safe-top)) 12px 8px;background:var(--wx-header);border-bottom:1px solid 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