SaaS 邮件客户端浅色瑞士排版界面

生成一张 1024x1280 像素、4:5 竖版浅色瑞士风邮件客户端界面。左侧文件夹「收件箱（14）」「已发送」「草稿」「归档」，顶部按钮「写邮件」。邮件列表为中文发件人和主题，阅读区显示中文邮件内容。右上按钮「回复」。品牌「示例应用 邮箱」。红色细线和大量留白，严谨网格。所有可见文字为简体中文，不出现英文文件夹、英文按钮、真实邮箱品牌、水印或乱码。

A browser tab screenshot of a SaaS email client inspired by Swiss typographic design principles, shown at 1280×800 resolution on a white background. Three-pane layout with strict flush-left alignment and no decorative elements. Left column (220px): a list of folder labels — "Inbox (14)", "Sent", "Drafts", "Archive" — in Helvetica Neue 14px regular; a "Compose" button as a red filled rectangle with white text, sitting flush at the top with zero border radius. Center column (360px): email list; each row shows sender name in 14px Bold, subject in 14px Regular, date in 12px right-aligned — all in pure black on white with only a thin 1px light-gray bottom border. Selected row has a solid red left border 3px wide. Right column (flexible): open email view; sender address and date in small uppercase gray, subject as 24px Helvetica Bold headline, body text in 16px Georgia serif. Reply button is a plain red text link "Reply →". No rounded corners, no icons, no avatars. Grid is 8px. Color palette: white, black, red (#E8000D). The result feels like a functional 1960s Swiss design poster, not a tech product.