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feat: Add Dark Mode Support for Enhanced Accessibility and UI #1183

Description

@IshwinderKaur8

Problem

Currently, the StudyPlan web application only supports a light mode theme. While the user interface is clean and functional, prolonged exposure to a bright white background can cause eye strain, especially for students who pull late-night study sessions.

Proposed Improvement

Implement a Dark Mode toggle feature that allows users to switch between light and dark themes seamlessly. This involves:

  • Adding a theme toggle switch/button in the navigation bar or header.
  • Defining a dark color palette that aligns with the existing design system (using accessible contrast ratios).
  • Utilizing local storage (or cookies) to persist the user's theme preference across sessions.

Why improvement is needed

  • Reduced Eye Strain: Many students study late at night; a dark theme reduces fatigue and visual discomfort.
  • Accessibility: Providing high-contrast dark alternatives assists users with certain visual impairments or light sensitivities.
  • Energy Efficiency: Dark modes can save battery life on devices with OLED/AMOLED screens.
  • Modern UX: It is a standard feature in modern web applications that significantly enhances overall user satisfaction.

Expected Result

  • A fully functional, smooth theme toggle on the UI.
  • All text, buttons, input fields, and AI-generated study plan components transition flawlessly to readable, well-contrasted dark colors.
  • The application remembers the user's preference on page reload.

Alternatives Considered

Relying on browser extensions (like Dark Reader): This often breaks custom UI components and provides an inconsistent user experience. A native implementation gives the project complete control over its visual identity.

Additional Context

Note to Maintainers: I am a GSSoC 2026 contributor. I would love to work on this feature! Please assign this issue to me and apply the appropriate labels.

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