* { box-sizing: border-box; }
body {
  font-family: Arial, sans-serif;
  margin: 0;
  line-height: 1.5;
}

header {
  border-bottom: 1px solid #e5e5e5;
  padding: 14px 18px;
}

nav {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
}

nav .logo {
  font-weight: 700;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 14px;
  padding: 0;
  margin: 0;
}

nav a {
  text-decoration: none;
  color: #111;
}

nav a:hover {
  text-decoration: underline;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 18px;
}

section {
  padding: 24px 0;
  border-bottom: 1px solid #f0f0f0;
}

footer {
  padding: 24px 18px;
  color: #555;
  border-top: 1px solid #e5e5e5;
}