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

body {
  font-family: "Segoe UI", sans-serif;
  line-height: 1.6;
  background-color: #f9f9f9;
  color: #222;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: #101820;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  flex-wrap: wrap;
}

.logo {
  font-size: 1.5rem;
  font-weight: bold;
}

nav a {
  color: #fff;
  margin-left: 1.5rem;
  text-decoration: none;
  font-weight: 500;
}

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

.banner {
  background-color: #007acc;
  color: white;
  text-align: center;
  padding: 3rem 1rem;
}

.banner h1 {
  font-size: 1.8rem;
}

main {
  flex: 1;
  padding: 2rem 1.5rem;
  max-width: 960px;
  margin: auto;
}

.content h2 {
  margin-bottom: 1rem;
}

.content h3 {
  margin-top: 1.5rem;
  color: #007acc;
}

ul {
  margin-left: 1.5rem;
  list-style-type: disc;
}

footer {
  background-color: #101820;
  color: white;
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
  header {
    flex-direction: column;
    align-items: flex-start;
  }

  nav {
    margin-top: 0.5rem;
  }

  nav a {
    display: inline-block;
    margin: 0.5rem 0.5rem 0 0;
  }

  .banner h1 {
    font-size: 1.4rem;
  }
}