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

body {
  font-family: Arial, Helvetica, sans-serif;
  color: #111;
  background: #fff;
  line-height: 1.6;
}

.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
}

.header {
  border-bottom: 1px solid #eee;
  padding: 20px 0;
}

.logo {
  font-weight: bold;
  font-size: 20px;
}

.nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #111;
}

.btn {
  padding: 10px 18px;
  border: 1px solid #111;
}

.btn-primary {
  background: #111;
  color: #fff;
}

.hero {
  padding: 80px 0;
  background: #f5f5f5;
}

.hero h1 {
  font-size: 40px;
  margin-bottom: 20px;
}

.section {
  padding: 70px 0;
}

.section.dark {
  background: #111;
  color: #fff;
}

.grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.footer {
  background: #000;
  color: #fff;
  padding: 30px 0;
  text-align: center;
}