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static char inputBuffer[64] = "";
ImGui::Text("卡密: %s", inputBuffer);

// 字母键盘 26键 + @，4个字母一行
const char* keys[] = {
    "Q","W","E","R",
    "T","Y","U","I",
    "D","F","G","H",
    "J","K","L","Z",
    "X","C","V","B",
    "@"
};

// 保存当前样式，修改后恢复
ImGuiStyle& style = ImGui::GetStyle();
float old_item_spacing_y = style.ItemSpacing.y;
float old_frame_padding_y = style.FramePadding.y;

// 调小垂直间距和内边距
style.ItemSpacing.y = 4.0f;    // 控件之间的垂直间距
style.FramePadding.y = 6.0f;   // 按钮内部上下内边距

for (int i = 0; i < IM_ARRAYSIZE(keys); i++) {
    if (ImGui::Button(keys[i], ImVec2(60, 36))) { // 稍微降低按钮高度
        strcat(inputBuffer, keys[i]);
    }
    // 每4个按钮换行
    if ((i + 1) % 4 == 0)
        ImGui::NewLine();
    else
        ImGui::SameLine();
}

// 恢复原来的样式
style.ItemSpacing.y = old_item_spacing_y;
style.FramePadding.y = old_frame_padding_y;

ImGui::SameLine();

// Clear + 撤回 + 确定
//if (ImGui::Button("Clear", ImVec2(90, 36))) { inputBuffer[0] = 0; } ImGui::SameLine();
if (ImGui::Button("撤回", ImVec2(90, 36))) {
    int len = strlen(inputBuffer);
    if (len > 0) inputBuffer[len-1] = 0;
} ImGui::SameLine();
if (ImGui::Button("确定", ImVec2(90, 36))) {
    if (strcmp(inputBuffer, "@ZHQFYX") == 0) {
        卡验证 = true;   // 登录成功
        Tab = 0;         // 自动跳转到主页
        inputBuffer[0] = 0;
    }