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

html, body {
  width: 100%;
  min-height: 100%;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: #1c1c1c;
  background: #f4f7f9;
  overflow-x: hidden;
}

nav {
  background: #0d1117;
  width: 100%;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  flex: 1;
}

nav ul li a {
  color: #c9d1d9;
  text-decoration: none;
  padding: 15px 25px;
  display: block;
  font-weight: 500;
  transition: background 0.3s ease, color 0.3s ease;
}

nav ul li a:hover,
nav ul li a.active {
  background: #21262d;
  color: #58a6ff;
}



main {
  width: 100%;
}

section {
  width: 100%;
  padding: 80px 20px;
  text-align: center;
}

footer {
  background: #0d1117;
  color: #c9d1d9;
  text-align: center;
  padding: 40px 20px;
  width: 100%;
  border-top: 2px solid #21262d;
}

footer .social-icons {
  margin-top: 15px;
}

footer .social-icons a {
  color: #c9d1d9;
  font-size: 20px;
  margin: 0 10px;
  display: inline-block;
  transition: color 0.3s ease, transform 0.2s ease;
}

footer .social-icons a:hover {
  color: #58a6ff;
  transform: scale(1.2);
}