/* Light mode (default) */
body {
	font-family: Tahoma,Verdana,sans-serif; 
    max-width: 700px;
    margin: 2rem auto;
    padding: 1rem;
    background-color: #FBFBFB;
    color: black;
    transition: background-color 0.3s, color 0.3s;
}
  
h1 {
    color: #007acc;
}

body.dark {
    background-color: #363636;
    color: #e0e0e0;
}

.nav-tabs {
    background: #eee;
    border-bottom: 2px solid #ccc;
    margin-bottom: 1.5rem;
}
  
.nav-tabs ul {
    list-style: none;
    display: flex;
    padding-left: 0;
    margin: 0;
}
  
.nav-tabs li {
    margin-right: 1.5rem;
}
  
.nav-tabs a {
    display: block;
    padding: 1rem 0;
    color: #333;
    text-decoration: none;
    border-bottom: 3px solid transparent;
    font-weight: 600;
}
  
.nav-tabs li.active a,
.nav-tabs a:hover {
    border-color: #007acc;
    color: #007acc;
}