body {
  margin: 0;
  font-family: 'Helvetica Neue', sans-serif;
  scroll-behavior: smooth;
  color: #333;
  background: #fff;
}

.hero {
  background-image: url('hero.jpg');
  background-size: cover;
  background-position: center;
  height: 100vh;
  color: white;
  position: relative;
}

.overlay {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 20px;
}

.overlay h1 {
  font-size: 3em;
  margin: 0;
  letter-spacing: 1px;
}

.overlay p {
  font-size: 1.2em;
  margin: 20px 0;
}

.btn {
  background: white;
  color: black;
  padding: 12px 24px;
  text-decoration: none;
  font-weight: bold;
  border-radius: 25px;
  transition: background 0.3s;
}

.btn:hover {
  background: #ddd;
}

.section {
  padding: 80px 20px;
  text-align: center;
}

.section h2 {
  font-size: 2em;
  margin-bottom: 20px;
}

.section p {
  font-size: 1.1em;
  max-width: 800px;
  margin: auto;
}

.light {
  background: #fff;
  color: #333;
}

.dark {
  background: #222;
  color: #f4f4f4;
}

footer {
  background: #111;
  color: #aaa;
  text-align: center;
  padding: 20px;
  font-size: 0.9em;
}