@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

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

body {
  font-family: 'Inter', sans-serif;
  background: linear-gradient(135deg, #f0f4f8, #ffffff);
  color: #333;
  line-height: 1.6;
}

header {
  background-color: #ffffff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  padding: 1.5em 0;
}

nav {
  display: flex;
  justify-content: center;
  gap: 2em;
  flex-wrap: wrap;
}

nav a {
  color: #005fcc;
  text-decoration: none;
  font-weight: 600;
  padding: 0.5em;
  border-radius: 5px;
  transition: background 0.2s ease, color 0.2s ease;
}

nav a:hover {
  background-color: #005fcc;
  color: white;
}

main {
  max-width: 960px;
  margin: 3em auto;
  padding: 2em;
  background: white;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

h1 {
  color: #005fcc;
  margin-bottom: 0.8em;
  font-size: 2em;
}

ul {
  list-style: none;
  padding-left: 0;
}

ul li::before {
  content: "-> ";
  color: #005fcc;
  margin-right: 0.4em;
}

a {
  color: #005fcc;
}

footer {
  text-align: center;
  padding: 2em;
  font-size: 0.9em;
  color: #777;
  margin-top: 4em;
}

@media (min-width: 769px) {
  header {
    position: sticky;
    top: 0;
    z-index: 999;
    background: #fff;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  }
}