科学计算器

使用 HTML5、CSS3 和 JavaScript 创建一个功能全面的科学计算器，外观与专业计算器一致。实现所有基本算术运算，并严格遵守运算优先级规则。包含高级科学函数（三角函数、对数函数、指数函数、统计函数），并提供角度/弧度模式切换开关。添加内存操作功能（M+、M−、MR、MC），并配备可视化状态指示器。维护一个可滚动的计算历史记录日志，支持清空或保存该日志。实现完整的键盘支持，配置恰当的按键映射与快捷键。针对除零错误、非法运算及溢出等情况，实现健壮的错误处理机制，并显示有帮助的错误提示信息。创建响应式设计，能够根据屏幕尺寸或设备朝向，在标准布局与科学布局之间自动切换。提供多种主题选项（经典、现代、高对比度）。添加可选的按钮按压音效反馈，并配备音量控制功能。实现结果与表达式的复制/粘贴功能。

Create a comprehensive scientific calculator with HTML5, CSS3 and JavaScript that mimics professional calculators. Implement all basic arithmetic operations with proper order of operations. Include advanced scientific functions (trigonometric, logarithmic, exponential, statistical) with degree/radian toggle. Add memory operations (M+, M-, MR, MC) with visual indicators. Maintain a scrollable calculation history log that can be cleared or saved. Implement full keyboard support with appropriate key mappings and shortcuts. Add robust error handling for division by zero, invalid operations, and overflow conditions with helpful error messages. Create a responsive design that transforms between standard and scientific layouts based on screen size or orientation. Include multiple theme options (classic, modern, high contrast). Add optional sound feedback for button presses with volume control. Implement copy/paste functionality for results and expressions.