```html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>UberTaxi - Premium Rides</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css">
    <style>
        /* Base styles and reset */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        :root {
            --primary-yellow: #FFD700;
            --accent-yellow: #FFC400;
            --dark-bg: #1a1a1a;
            --light-text: #ffffff;
            --dark-text: #222222;
            --gray-bg: #f5f5f5;
            --medium-gray: #e0e0e0;
            --shadow-sm: 0 4px 6px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
            --transition: all 0.3s ease;
        }

        body {
            font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
            line-height: 1.6;
            color: var(--dark-text);
            background-color: var(--light-text);
            overflow-x: hidden;
        }

        h1, h2, h3 {
            font-weight: 700;
            line-height: 1.2;
        }

        img {
            max-width: 100%;
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        .btn {
            display: inline-block;
            background: var(--primary-yellow);
            color: var(--dark-bg);
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 700;
            text-transform: uppercase;
            text-decoration: none;
            letter-spacing: 1px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 2px solid transparent;
        }

        .btn:hover {
            background: var(--accent-yellow);
            transform: translateY(-3px);
            box-shadow: var(--shadow-lg);
        }

        .btn:active {
            transform: translateY(0);
        }

        .section-title {
            text-align: center;
            margin-bottom: 50px;
            font-size: 2.5rem;
            position: relative;
        }

        .section-title:after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--primary-yellow);
        }

        /* Header & Navigation */
        header {
            background-color: var(--dark-bg);
            padding: 20px 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.2);
        }

        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            color: var(--primary-yellow);
            font-size: 1.8rem;
            font-weight: 800;
            text-decoration: none;
            display: flex;
            align-items: center;
        }

        .logo i {
            margin-right: 10px;
            font-size: 2rem;
        }

        .nav-links {
            display: flex;
            list-style: none;
            gap: 30px;
        }

        .nav-links a {
            color: var(--light-text);
            text-decoration: none;
            font-weight: 600;
            position: relative;
            padding: 5px 0;
        }

        .nav-links a:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary-yellow);
            transition: var(--transition);
        }

        .nav-links a:hover:after {
            width: 100%;
        }

        .nav-links a:hover {
            color: var(--primary-yellow);
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--light-text);
            font-size: 1.5rem;
            cursor: pointer;
        }

        /* Hero Section */
        .hero {
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), 
                        url('https://images.unsplash.com/photo-1536520009089-1ffc5fb574ecd?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1920&q=80');
            background-size: cover;
            background-position: center;
            min-height: 90vh;
            display: flex;
            align-items: center;
            text-align: center;
            padding: 80px 0;
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .hero h1 {
            color: var(--light-text);
            font-size: 3.5rem;
            margin-bottom: 20px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .hero p {
            color: var(--light-text);
            font-size: 1.3rem;
            margin-bottom: 40px;
            opacity: 0.9;
        }

        .hero-btns {
            display: flex;
            justify-content: center;
            gap: 20px;
        }

        .btn-secondary {
            background: transparent;
            color: var(--light-text);
            border: 2px solid var(--light-text);
        }

        .btn-secondary:hover {
            background: rgba(255,255,255,0.1);
            border-color: var(--primary-yellow);
            color: var(--primary-yellow);
        }

        /* Features Section */
        .features {
            padding: 100px 0;
            background: var(--gray-bg);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 40px;
            margin-top: 50px;
        }

        .feature-card {
            background: var(--light-text);
            padding: 40px 30px;
            border-radius: 15px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: var(--shadow-lg);
        }

        .feature-icon {
            background: rgba(255, 200, 0, 0.15);
            width: 80px;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            margin: 0 auto 25px;
            color: var(--primary-yellow);
            font-size: 2rem;
        }

        .feature-card h3 {
            margin-bottom: 15px;
            font-size: 1.4rem;
        }

        /* App Section */
        .app-section {
            padding: 100px 0;
            background: var(--dark-bg);
            color: var(--light-text);
        }

        .app-flex {
            display: flex;
            align-items: center;
            gap: 60px;
        }

        .app-flex > div {
            flex: 1;
        }

        .app-content h2 {
            color: var(--primary-yellow);
            margin-bottom: 20px;
        }

        .app-steps {
            margin: 30px 0;
        }

        .step {
            display: flex;
            align-items: flex-start;
            margin-bottom: 25px;
            gap: 20px;
        }

        .step-number {
            background: var(--primary-yellow);
            color: var(--dark-bg);
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-weight: 700;
        }

        .app-image {
            border-radius: 20px;
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }

        /* Footer */
        footer {
            background: #111111;
            color: var(--light-text);
            padding: 70px 0 30px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h3 {
            color: var(--primary-yellow);
            margin-bottom: 25px;
            font-size: 1.4rem;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 15px;
        }

        .footer-links a {
            color: var(--medium-gray);
            text-decoration: none;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: var(--primary-yellow);
        }

        .social-links {
            display: flex;
            gap: 20px;
            margin-top: 20px;
        }

        .social-links a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            background: #333;
            border-radius: 50%;
            color: var(--light-text);
            font-size: 1.2rem;
            transition: var(--transition);
        }

        .social-links a:hover {
            background: var(--primary-yellow);
            color: var(--dark-bg);
            transform: translateY(-3px);
        }

        .footer-bottom {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #333;
            color: var(--medium-gray);
            font-size: 0.9rem;
        }

        /* Responsive Design */
        @media (max-width: 991px) {
            .hero h1 {
                font-size: 2.8rem;
            }

            .app-flex {
                flex-direction: column;
                text-align: center;
            }

            .step {
                justify-content: center;
            }

            .app-image {
                max-width: 80%;
                margin: 0 auto;
            }
        }

        @media (max-width: 768px) {
            .mobile-toggle {
                display: block;
            }

            .nav-links {
                position: fixed;
                top: 70px;
                right: -100%;
                flex-direction: column;
                background: var(--dark-bg);
                width: 75%;
                height: calc(100vh - 70px);
                padding: 40px 30px;
                transition: var(--transition);
            }

            .nav-links.active {
                right: 0;
            }

            .hero-btns {
                flex-direction: column;
            }

            .btn {
                width: 100%;
            }
        }

        @media (max-width: 576px) {
            .hero h1 {
                font-size: 2.3rem;
            }

            .hero p {
                font-size: 1.1rem;
            }

            .section-title {
                font-size: 2rem;
            }
        }
    </style>
</head>
<body>
    <!-- Header Section -->
    <header>
        <div class="container">
            <nav class="navbar">
                <a href="index.html" class="logo">
                    <i class="fas fa-taxi"></i>
                    UBER<span style="color: #FFD700">TAXI</span>
                </a>
                <ul class="nav-links">
                    <li><a href="#">Home</a></li>
                    <li><a href="#">Rides</a></li>
                    <li><a href="#">Pricing</a></li>
                    <li><a href="#">Cities</a></li>
                    <li><a href="#">Support</a></li>
                </ul>
                <button class="mobile-toggle">
                    <i class="fas fa-bars"></i>
                </button>
            </nav>
        </div>
    </header>

    <!-- Hero Section -->
    <section class="hero">
        <div class="container">
            <div class="hero-content">
                <h1>Ride in Comfort & Style</h1>
                <p>Experience premium taxi service at your fingertips. Quick, reliable, and safe rides across the city at competitive prices.</p>
                <div class="hero-btns">
                    <a href="#" class="btn">Book a Ride Now</a>
                    <a href="#" class="btn btn-secondary">Learn More</a>
                </div>
            </div>
        </div>
    </section>

    <!-- Features Section -->
    <section class="features">
        <div class="container">
            <h2 class="section-title">Why Choose UberTaxi</h2>
            <div class="features-grid">
                <div class="feature-card">
                    <div class="feature-icon">
                        <i class="fas fa-bolt"></i>
                    </div>
                    <h3>Instant Booking</h3>
                    <p>Get a taxi in minutes with our advanced dispatch system. Available 24/7 when you need us.</p>
                </div>
                <div class="feature-card">
                    <div class="feature-icon">
                        <i class="fas fa-star"></i>
                    </div>
                    <h3>Top Rated Drivers</h3>
                    <p>Travel safely with verified, experienced drivers rated by passengers like you.</p>
                </div>
                <div class="feature-card">
                    <div class="feature-icon">
                        <i class="fas fa-map-marked-alt"></i>
                    </div>
                    <h3>Real Time Tracking</h3>
                    <p>Track your ride from pickup to destination with our live GPS tracking system.</p>
                </div>
                <div class="feature-card">
                    <div class="feature-icon">
                        <i class="fas fa-dollar-sign"></i>
                    </div>
                    <h3>Best Pricing</h3>
                    <p>Enjoy competitive rates with no surge pricing during peak hours. Upfront pricing.</p>
                </div>
            </div>
        </div>
    </section>

    <!-- App Promotion Section -->
    <section class="app-section">
        <div class="container">
            <div class="app-flex">
                <div class="app-content">
                    <h2>Get the UberTaxi App</h2>
                    <p>Download our app to access exclusive features and a seamless booking experience.</p>
                    <div class="app-steps">
                        <div class="step">
                            <div class="step-number">1</div>
                            <p>Download app from App Store or Google Play</p>
                        </div>
                        <div class="step">
                            <div class="step-number">2</div>
                            <p>Create your account in seconds</p>
                        </div>
                        <div class="step">
                            <div class="step-number">3</div>
                            <p>Book your first ride instantly!</p>
                        </div>
                    </div>
                    <div>
                        <a href="#" class="btn">Download Now</a>
                    </div>
                </div>
                <div class="app-image">
                    <img src="https://images.unsplash.com/photo-1611337478950-1ef0951758cd?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=880&q=80" alt="UberTaxi Mobile App">
                </div>
            </div>
        </div>
    </section>

    <!-- Footer Section -->
    <footer>
        <div class="container">
            <div class="footer-grid">
                <div class="footer-col">
                    <h3>UBERTAXI</h3>
                    <p>Premium taxi services for your everyday travel. Your comfort is our priority.</p>
                    <div class="social-links">
                        <a href="#"><i class="fab fa-facebook-f"></i></a>
                        <a href="#"><i class="fab fa-twitter"></i></a>
                        <a href="#"><i class="fab fa-instagram"></i></a>
                        <a href="#"><i class="fab fa-linkedin-in"></i></a>
                    </div>
                </div>
                <div class="footer-col">
                    <h3>Services</h3>
                    <ul class="footer-links">
                        <li><a href="#">Airport Transfer</a></li>
                        <li><a href="#">City Rides</a></li>
                        <li><a href="#">Corporate Travel</a></li>
                        <li><a href="#">Night Rides</a></li>
                        <li><a href="#">Luxury Vehicles</a></li>
                    </ul>
                </div>
                <div class="footer-col">
                    <h3>Company</h3>
                    <ul class="footer-links">
                        <li><a href="#">About Us</a></li>
                        <li><a href="#">Careers</a></li>
                        <li><a href="#">Press Center</a></li>
                        <li><a href="#">Privacy Policy</a></li>
                        <li><a href="#">Terms of Service</a></li>
                    </ul>
                </div>
                <div class="footer-col">
                    <h3>Support</h3>
                    <ul class="footer-links">
                        <li><a href="#">Help Center</a></li>
                        <li><a href="#">Contact Us</a></li>
                        <li><a href="#">FAQs</a></li>
                        <li><a href="#">Ride Safety</a></li>
                        <li><a href="#">COVID-19</a></li>
                    </ul>
                </div>
            </div>
            <div class="footer-bottom">
                <p>&copy; 2023 UberTaxi. All rights reserved. Premium transportation services.</p>
            </div>
        </div>
    </footer>

    <!-- Mobile Navigation Toggle Script (Simple CSS only solution) -->
    <script>
        document.addEventListener('DOMContentLoaded', function() {
            const toggleBtn = document.querySelector('.mobile-toggle');
            const navLinks = document.querySelector('.nav-links');
            
            toggleBtn.addEventListener('click', () => {
                navLinks.classList.toggle('active');
            });
        });
    </script>
</body>
</html>
```

This UberTaxi homepage features:

1. Modern, sleek design with a yellow theme matching Uber's branding
2. Responsive layout that works on all screen sizes
3. Key sections:
   - Sticky header with navigation 
   - Hero section with background image and CTA buttons
   - Features section with appealing cards
   - App promotion section with step-by-step guide
   - Comprehensive footer with company info and links

The design uses:
- A professional color palette centered around Uber's yellow (#FFD700)
- Modern typography with appropriate spacing
- Smooth animations and hover effects
- Cards with subtle shadows for depth
- Responsive grid layouts for content organization
- Mobile-first approach with hamburger menu

All styling is contained within the same HTML file in the `<style>` section, including media queries for responsive design. The JavaScript is minimal and only handles the mobile menu toggle. The UI includes placeholder royalty-free images from Unsplash.