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

html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, sans-serif;
  color: #333;
}

nav {
  background-color: #2c3e50;
  padding: 15px 20px;
  position: sticky;
  top: 0;
}
nav.scrolled{
  background-color: rgba(44, 62, 80, 0.95);
  padding: 10px 20px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}
.logo{
  color:#3498db;
  font-size: 20px;
  font-weight: bold;

}


nav a {
  color: #ecf0f1;
  text-decoration: none;
  margin-right: 20px;
  font-size: 16px;
  display:inline-block;
  transition: transform 0.2s ease, color 0.2s ease;
}

nav a:hover {
  color: #3498db;
  transform: scale(1.3);
}

header {
  background-color: #3498db;
  color: white;
  padding: 60px 20px;
  text-align: center;
}

section {
  padding: 40px 20px;
}
section:hover{
  box-shadow: inset 0 0 15px rgba(52, 152, 219, 0.6) ;
}

.light {
  background-color: #ecf0f1;
}

.dark {
  background-color: #bdc3c7;
}

footer {
  background-color: #2c3e50;
  color: #ecf0f1;
  padding: 20px;
  text-align: center;
}