* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Helvetica Neue', sans-serif;
}

body {
  background: #f9f9f9;
  color: #333;
  line-height: 1.6;
}

header.hero {
  background: url('https://images.unsplash.com/photo-1531297484001-80022131f5a1?fit=crop&w=1950&q=80') no-repeat center center/cover;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  text-align: center;
  color: white;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
}

.hero-content {
  position: relative;
  z-index: 2;
}

h1 {
  font-size: 3rem;
  margin-bottom: 0.5em;
}

h2 {
  font-size: 2rem;
  margin-bottom: 0.5em;
}

p {
  margin-bottom: 1em;
}

section {
  padding: 4em 2em;
}

.container {
  max-width: 900px;
  margin: auto;
}

.btn {
  display: inline-block;
  background: #4f46e5;
  color: white;
  padding: 0.75em 1.5em;
  border-radius: 5px;
  text-decoration: none;
  transition: background 0.3s;
}

.btn:hover {
  background: #4338ca;
}

footer {
  text-align: center;
  padding: 2em;
  background: #333;
  color: white;
}