冥想计时器应用

使用 HTML5、CSS3 和 JavaScript 构建一个正念冥想计时器。创建一个宁静、无干扰的界面，采用受自然启发的设计风格。实现可自定义的冥想会话，包含准备阶段、冥想阶段和休息阶段。添加环境音效选项，包括自然声音、双耳节拍（binaural beats）和白噪音。包含引导式冥想功能，并支持自定义语音提示。实现带音量控制与音效选择的间隔铃声。添加会话历史记录与统计数据追踪功能。创建带动画效果的可视化呼吸引导。作为渐进式 Web 应用（PWA）支持离线使用。包含深色模式及多种主题。添加会话排程与提醒功能。

Build a mindfulness meditation timer using HTML5, CSS3, and JavaScript. Create a serene, distraction-free interface with nature-inspired design. Implement customizable meditation sessions with preparation, meditation, and rest intervals. Add ambient sound options including nature sounds, binaural beats, and white noise. Include guided meditation with customizable voice prompts. Implement interval bells with volume control and sound selection. Add session history and statistics tracking. Create visual breathing guides with animations. Support offline usage as a PWA. Include dark mode and multiple themes. Add session scheduling with reminders.