viet-anh.n f77fcbddc9 [TSC-4] Implement responsive CSS layout and styling

- Add styles.css with mobile-first responsive design (Flexbox/Grid)
- Three breakpoints: mobile (320px+), tablet (768px+), desktop (1024px+)
- All interactive elements meet 44x44px minimum touch target size
- WCAG AA color contrast: text #1a1a1a on white (~17:1), buttons #fff on #1565c0 (~5.85:1), error #c62828 on white (~5.6:1)
- Clear visual hierarchy: h1 > h2 > body text, prominent result area, red error styling
- Link styles.css from index.html
- Update CLAUDE.md project structure to include styles.css

2026-07-08 06:29:14 +00:00

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Simple Calculator

Greenfield project. Implementation is driven by the Vexa AI-SDLC pipeline (Jira project TSC).

Project Structure

/
├── index.html  # Calculator UI (semantic HTML5)
├── styles.css  # Responsive CSS layout and styling
├── README.md   # Project overview
└── CLAUDE.md   # This file

Build Commands

No build system has been configured yet. Update this section once a language/framework is chosen and dependencies are added.

Test Commands

No test suite has been configured yet. Update this section once testing infrastructure is in place.

Development Commands

No dev server or REPL is configured yet. Update this section once the implementation begins.

Architecture Notes

Domain: Simple Calculator — arithmetic operations (add, subtract, multiply, divide at minimum).
Stack: Plain HTML/CSS/JS — no framework or build step.
index.html contains the full UI structure: operand inputs, operation buttons, calculate/clear buttons, result <output>, and an error <p role="alert">.

Code Style

No linter or formatter has been configured yet. Update this section once tooling is set up.

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