Project structure

mathsite/
├── index.html                  → Home page
├── css/
│   └── style.css               → All styling (shared across every page)
├── js/
│   ├── cubic.js                → Cubic equations logic
│   ├── differentiation.js      → Differentiation page logic
│   ├── hero.js                 → Homepage animated polygon → circle
│   ├── integration.js          → Integration page logic
│   ├── linear.js               → Linear equations logic
│   ├── nav.js                  → Mobile menu toggle (shared)
│   ├── polynomials.js          → Polynomial equations logic
│   ├── pythagoras.js           → Pythagoras page logic
│   ├── quadratic.js            → Quadratic equations logic
│   ├── shapes.js               → Shapes page logic
│   ├── tabs.js                 → Intro / working-area tab switcher (shared)
│   ├── triangle.js             → Triangle page logic
│   └── trig.js                 → Trigonometry page logic
└── pages/
    ├── cubic-equations.html    → Cubic equations page
    ├── definmath.html          → Alphabetical topics index
    ├── differentiation.html    → Differentiation page
    ├── equations.html          → Main equations hub
    ├── integration.html        → Integration page
    ├── linear-equations.html   → Linear equations page
    ├── number-patterns.html    → Number patterns page
    ├── polynomials.html        → Polynomial equations page
    ├── pythagoras.html         → Pythagoras theorem page
    ├── quadratic-equations.html→ Quadratic equations page
    ├── shapes.html             → Shapes page
    ├── triangle.html           → Triangles page
    └── trigonometry.html       → Trigonometry page