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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #ffffff;
  color: #333;
  line-height: 1.6;
}

header {
  background: linear-gradient(to bottom, #007BFF, #00AEEF); /* top to bottom */
  color: white;
  padding-top: 20px;
  padding-bottom: 30px;
}

.navbar {
  max-width: 1100px;
  margin: 0 auto;
  text-align: center;
}

.logo {
  font-size: 2em;
  font-weight: bold;
  margin-bottom: 15px;
}

nav {
  display: flex;
  justify-content: center;
  gap: 30px;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  font-size: 1.05em;
  transition: opacity 0.2s ease-in-out;
}

nav a:hover {
  opacity: 0.8;
}

nav a.active {
  text-decoration: underline;
}

.container {
  max-width: 1000px;
  margin: 40px auto;
  padding: 0 20px;
}

main h1 {
  margin-bottom: 20px;
}

main h2 {
  margin-top: 30px;
  color: #007BFF;
}

ul {
  margin: 10px 0 20px 20px;
}

footer {
  text-align: center;
  font-size: 0.9em;
  color: #555;
  padding: 30px 0;
  border-top: 1px solid #ddd;
  background: #f9f9f9;
}