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HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
  <title>Developer Portfolio</title>
  <link rel="stylesheet" href="style.css" />
</head>
<body>
  <header>
    <div class="container">
      <h1>John Doe</h1>
      <nav>
        <ul>
          <li><a href="#about">About</a></li>
          <li><a href="#projects">Projects</a></li>
          <li><a href="#contact">Contact</a></li>
        </ul>
      </nav>
    </div>
  </header>

<section class="hero">
    <div class="container">
      <h2>Hello, I'm John — Web Developer</h2>
      <p>I build modern and responsive websites.</p>
    </div>
  </section>

<section id="about" class="section">
    <div class="container">
      <h2>About Me</h2>
      <p>I’m a passionate web developer with experience in HTML, CSS, JavaScript, and modern frameworks. I enjoy turning complex problems into simple, beautiful solutions.</p>
    </div>
  </section>

<section id="projects" class="section">
    <div class="container">
      <h2>Projects</h2>
      <div class="projects">
        <div class="project">
          <h3>Portfolio Website</h3>
          <p>A personal portfolio to showcase my work.</p>
        </div>
        <div class="project">
          <h3>Weather App</h3>
          <p>Built with JavaScript using OpenWeather API.</p>
        </div>
      </div>
    </div>
  </section>

<section id="contact" class="section">
    <div class="container">
      <h2>Contact</h2>
      <form>
        <input type="text" placeholder="Your Name" required />
        <input type="email" placeholder="Your Email" required />
        <textarea placeholder="Your Message" required>

CSS

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

body {
  font-family: 'Segoe UI', sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f9f9f9;
}

.container {
  width: 90%;
  max-width: 1000px;
  margin: 0 auto;
}

header {
  background: #222;
  color: #fff;
  padding: 1rem 0;
}

header h1 {
  display: inline-block;
  margin-right: 2rem;
}

nav ul {
  list-style: none;
  display: inline-block;
}

nav ul li {
  display: inline;
  margin-left: 1rem;
}

nav ul li a {
  color: #fff;
  text-decoration: none;
}

.hero {
  background: #007acc;
  color: #fff;
  padding: 4rem 0;
  text-align: center;
}

.section {
  padding: 3rem 0;
}

.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.project {
  background: #fff;
  padding: 1rem;
  border: 1px solid #ddd;
  border-radius: 8px;
}

form {
  display: flex;
  flex-direction: column;
}

form input,
form textarea {
  margin-bottom: 1rem;
  padding: 0.75rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}

form button {
  padding: 0.75rem;
  background: #007acc;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

form button:hover {
  background: #005fa3;
}

footer {
  text-align: center;
  padding: 1rem 0;
  background: #222;
  color: white;
}