Design Fully Responsive "IRONFIT" Gym Website

Create a premium, modern, fully responsive gym website named **IRONFIT**.

- Design: Premium black and dark background with bold red accents, stylish typography, smooth animations, and a professional fitness aesthetic.
- Homepage: Large hero section with gym background, “BUILD YOUR BEST BODY” heading, Join Now button, and fitness statistics.
- About Us: Gym introduction, modern equipment, professional trainers, and fitness benefits.
- Programs: Strength training, muscle building, weight loss, HIIT, cardio, and boxing.
- Trainers: Professional trainer profiles with photos, names, and specializations.
- BMI Calculator: Working calculator that accepts height and weight and displays BMI results.
- Membership Plans: Basic, Pro, and Elite pricing cards in Indian rupees, with functional Join Now buttons.
- Testimonials: Customer reviews with a working slider.
- Gallery: Attractive gym and workout photos.
- FAQ: Expandable questions and answers.
- Contact: Contact form with name, email, phone number, fitness goal, and message.
- Navigation: Responsive navigation bar with a working mobile menu.
- Footer: Quick links, contact details, and opening hours.
- Functionality: Working JavaScript interactions, form validation, smooth scrolling, and responsive layout for mobile, tablet, and desktop.
- Files: Provide clean, complete, ready-to-use `index.html`, `style.css`, and `script.js` files. All three files must work together without errors.
- Important: Do not display code fragments, extra text, or incorrect branding on the website. The correct brand name is **IRONFIT**.
- Make the website visually impressive, fast-loading, easy to use, and ready to run in VS Code with Live Server.