Bootstrap 5 Hero Section Example with Background Overlay

<!-- Bootstrap 5 CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet">

<!-- Google Fonts - Roboto -->
<link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700;900&display=swap" rel="stylesheet">

<!-- Ionicons -->
<script type="module" src="https://unpkg.com/ionicons@7.1.0/dist/ionicons/ionicons.esm.js"></script>
<script nomodule src="https://unpkg.com/ionicons@7.1.0/dist/ionicons/ionicons.js"></script>

<style>
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    font-family: 'Roboto', sans-serif;
    overflow-x: hidden;
  }

  /* Navbar */
  .navbar-custom {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 25px 0;
    background: transparent;
    transition: all 0.3s ease;
  }

  .navbar-custom.scrolled {
    position: fixed;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  }

  .navbar-brand {
    font-weight: 700;
    font-size: 1.8rem;
    color: white !important;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: color 0.3s ease;
  }

  .navbar-custom.scrolled .navbar-brand {
    color: #667eea !important;
  }

  .navbar-brand ion-icon {
    font-size: 32px;
  }

  .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    margin: 0 15px;
    transition: color 0.3s ease;
  }

  .navbar-nav .nav-link:hover {
    color: white !important;
  }

  .navbar-custom.scrolled .navbar-nav .nav-link {
    color: #4b5563 !important;
  }

  .navbar-custom.scrolled .navbar-nav .nav-link:hover {
    color: #667eea !important;
  }

  .btn-navbar {
    background: white;
    color: #667eea;
    padding: 10px 30px;
    border-radius: 50px;
    font-weight: 600;
    border: 2px solid white;
    transition: all 0.3s ease;
  }

  .btn-navbar:hover {
    background: transparent;
    color: white;
    transform: translateY(-2px);
  }

  .navbar-custom.scrolled .btn-navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-color: #667eea;
  }

  .navbar-custom.scrolled .btn-navbar:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
  }

  /* Hero Section */
  .hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
  }

  /* Background Image */
  .hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://images.unsplash.com/photo-1517694712202-14dd9538aa97?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 1;
  }

  /* Animated Background Pattern */
  .hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
      radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
      radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%);
    animation: moveGradient 15s ease infinite;
  }

  @keyframes moveGradient {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.8; }
  }

  /* Dark Overlay */
  .hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.8) 0%, rgba(118, 75, 162, 0.85) 100%);
    z-index: 2;
  }

  /* Animated Particles */
  .particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 3;
    overflow: hidden;
  }

  .particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    animation: float 20s linear infinite;
  }

  @keyframes float {
    0% {
      transform: translateY(100vh) translateX(0);
      opacity: 0;
    }
    10% {
      opacity: 1;
    }
    90% {
      opacity: 1;
    }
    100% {
      transform: translateY(-100px) translateX(100px);
      opacity: 0;
    }
  }

  .particle:nth-child(1) { left: 10%; animation-delay: 0s; animation-duration: 15s; }
  .particle:nth-child(2) { left: 25%; animation-delay: 2s; animation-duration: 18s; }
  .particle:nth-child(3) { left: 40%; animation-delay: 4s; animation-duration: 20s; }
  .particle:nth-child(4) { left: 55%; animation-delay: 1s; animation-duration: 16s; }
  .particle:nth-child(5) { left: 70%; animation-delay: 3s; animation-duration: 19s; }
  .particle:nth-child(6) { left: 85%; animation-delay: 5s; animation-duration: 17s; }

  /* Hero Content */
  .hero-content {
    position: relative;
    z-index: 4;
    color: white;
    padding: 120px 0 80px;
  }

  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 10px 25px;
    border-radius: 50px;
    font-weight: 500;
    font-size: 0.95rem;
    margin-bottom: 30px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: fadeInDown 1s ease 0.2s both;
  }

  .hero-badge ion-icon {
    font-size: 20px;
  }

  .hero-title {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 25px;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    animation: fadeInUp 1s ease 0.4s both;
  }

  .hero-subtitle {
    font-size: 1.4rem;
    font-weight: 300;
    line-height: 1.7;
    margin-bottom: 40px;
    opacity: 0.95;
    max-width: 650px;
    animation: fadeInUp 1s ease 0.6s both;
  }

  .hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.8s both;
  }

  .btn-hero-primary {
    background: white;
    color: #667eea;
    padding: 18px 45px;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.1rem;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
  }

  .btn-hero-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.3);
    color: #667eea;
  }

  .btn-hero-primary ion-icon {
    font-size: 24px;
  }

  .btn-hero-secondary {
    background: transparent;
    color: white;
    padding: 18px 45px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    border: 2px solid rgba(255, 255, 255, 0.5);
    display: inline-flex;
    align-items: center;
    gap: 12px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
  }

  .btn-hero-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: white;
    transform: translateY(-3px);
    color: white;
  }

  .btn-hero-secondary ion-icon {
    font-size: 24px;
  }

  /* Stats Section */
  .hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 40px;
    margin-top: 60px;
    padding-top: 60px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    animation: fadeInUp 1s ease 1s both;
  }

  .stat-item {
    text-align: center;
  }

  .stat-number {
    font-size: 3rem;
    font-weight: 900;
    display: block;
    margin-bottom: 10px;
  }

  .stat-label {
    font-size: 1rem;
    opacity: 0.9;
    font-weight: 400;
  }

  /* Scroll Indicator */
  .scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 4;
    animation: bounce 2s infinite;
  }

  .scroll-indicator ion-icon {
    font-size: 36px;
    color: white;
    opacity: 0.8;
  }

  @keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
  }

  /* Animations */
  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes fadeInDown {
    from {
      opacity: 0;
      transform: translateY(-30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* Responsive */
  @media (max-width: 768px) {
    .hero-title {
      font-size: 2.5rem;
    }

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

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

    .btn-hero-primary,
    .btn-hero-secondary {
      width: 100%;
      justify-content: center;
    }

    .hero-stats {
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .stat-number {
      font-size: 2rem;
    }
  }
</style>

  <!-- Navbar -->
  <nav class="navbar navbar-expand-lg navbar-custom" id="navbar">
    <div class="container">
      <a class="navbar-brand" href="#">
        <ion-icon name="flame"></ion-icon>
        BrandName
      </a>
      <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav" style="border-color: rgba(255,255,255,0.5);">
        <span class="navbar-toggler-icon" style="filter: brightness(0) invert(1);"></span>
      </button>
      <div class="collapse navbar-collapse" id="navbarNav">
        <ul class="navbar-nav ms-auto align-items-center">
          <li class="nav-item">
            <a class="nav-link" href="#home">Home</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#features">Features</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#pricing">Pricing</a>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#about">About</a>
          </li>
          <li class="nav-item">
            <button class="btn btn-navbar">
              Get Started
            </button>
          </li>
        </ul>
      </div>
    </div>
  </nav>

  <!-- Hero Section -->
  <section class="hero-section" id="home">
    <!-- Background Image -->
    <div class="hero-background"></div>

    <!-- Overlay -->
    <div class="hero-overlay"></div>

    <!-- Animated Particles -->
    <div class="particles">
      <div class="particle"></div>
      <div class="particle"></div>
      <div class="particle"></div>
      <div class="particle"></div>
      <div class="particle"></div>
      <div class="particle"></div>
    </div>

    <!-- Content -->
    <div class="container">
      <div class="row">
        <div class="col-lg-10 col-xl-8">
          <div class="hero-content">
            <span class="hero-badge">
              <ion-icon name="sparkles"></ion-icon>
              New Feature Available
            </span>

            <h1 class="hero-title">
              Transform Your Business with Innovation
            </h1>

            <p class="hero-subtitle">
              Empower your team with cutting-edge solutions designed to accelerate growth, 
              streamline operations, and unlock new possibilities for your business.
            </p>

            <div class="hero-buttons">
              <button class="btn btn-hero-primary">
                Start Free Trial
                <ion-icon name="arrow-forward-circle"></ion-icon>
              </button>
              <button class="btn btn-hero-secondary">
                <ion-icon name="play-circle"></ion-icon>
                Watch Demo
              </button>
            </div>

            <!-- Stats -->
            <div class="hero-stats">
              <div class="stat-item">
                <span class="stat-number">10K+</span>
                <span class="stat-label">Active Users</span>
              </div>
              <div class="stat-item">
                <span class="stat-number">50+</span>
                <span class="stat-label">Countries</span>
              </div>
              <div class="stat-item">
                <span class="stat-number">99%</span>
                <span class="stat-label">Satisfaction</span>
              </div>
              <div class="stat-item">
                <span class="stat-number">24/7</span>
                <span class="stat-label">Support</span>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>

    <!-- Scroll Indicator -->
    <div class="scroll-indicator">
      <ion-icon name="chevron-down"></ion-icon>
    </div>
  </section>

  <!-- Additional Content Section -->
  <section style="min-height: 100vh; background: #f5f7fa; display: flex; align-items: center; justify-content: center;">
    <div class="container text-center">
      <h2 style="font-size: 2.5rem; font-weight: 700; color: #333; margin-bottom: 20px;">
        Continue Your Journey
      </h2>
      <p style="font-size: 1.2rem; color: #666;">
        Scroll down to discover more amazing features and content.
      </p>
    </div>
  </section>

  <!-- Bootstrap 5 JS Bundle -->
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>

  <script>
    // Navbar scroll effect
    window.addEventListener('scroll', function() {
      const navbar = document.getElementById('navbar');
      if (window.scrollY > 100) {
        navbar.classList.add('scrolled');
      } else {
        navbar.classList.remove('scrolled');
      }
    });

    // Smooth scroll for anchor links
    document.querySelectorAll('a[href^="#"]').forEach(anchor => {
      anchor.addEventListener('click', function (e) {
        e.preventDefault();
        const target = document.querySelector(this.getAttribute('href'));
        if (target) {
          target.scrollIntoView({
            behavior: 'smooth',
            block: 'start'
          });
        }
      });
    });
  </script>