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.15s;letter-spacing:.04em;flex-shrink:0}.thread-lang-btn:hover{background:#007aff26}.thread-lang-btn:disabled{opacity:.5;cursor:not-allowed}.thread-lang-btn.active{background:var(--im-blue);color:#fff;border-color:var(--im-blue)}.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;background:var(--im-sidebar-bg);color:var(--im-text-muted)}.empty-state-icon{font-size:72px;line-height:1}.empty-state-title{font-size:28px;font-weight:700;color:var(--im-text-primary);letter-spacing:-.5px}.empty-state-sub{font-size:14px;color:var(--im-text-muted);max-width:300px;text-align:center;line-height:1.5}.thread-loading{flex:1;display:flex;align-items:center;justify-content:center;color:var(--im-text-muted)}:root{--im-blue: #007aff;--im-blue-dark: #0062cc;--im-gray-bubble: #e9e9eb;--im-bg: #ffffff;--im-sidebar-bg: #f5f5f7;--im-chat-bg: #ffffff;--im-header-bg: #f5f5f7;--im-border: #d1d1d6;--im-separator: rgba(60,60,67,.18);--im-text-primary: 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