body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: #333;
}

header {
  background: #0078d7;
  color: white;
  text-align: center;
  padding: 1rem;
}

.level-content { display: none; }
  .level-content:target { display: block; }
  
body:not(:has(:target)) #beginner {
   display: block;
}

.tabs {
  display: flex;
    gap: 1rem;                  
    padding: 1rem 2rem;
    justify-content: center;
    flex-wrap: wrap; 
}
.mains h1{
  display:flex;
  justify-content: center;
}

h2 {
  text-align: center;
}

.level-content {
  display: none; 
  margin: 20px auto;
  max-width: 800px; 
  padding: 10px;
}

.level-content h2{
  display:flex;
  justify-content: center;
}

.level-content table {
  width: 100%;
  table-layout: fixed; 
  border-collapse: collapse;
  margin: 15px 0;
  font-family: Arial, sans-serif;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  border-radius: 8px;
  overflow: hidden;
}

.level-content th, .level-content td {
  padding: 12px 15px;
  text-align: center;
  border-bottom: 1px solid lightgray;
}

.level-content th {
  background-color: green;
  color: white;
  font-weight: bold;
}

.tabs a {
  padding: 5px 10px;
  margin-right: 5px;
  text-decoration: none;
  background: #eee;
  border-radius: 4px;
  color: #333;
}
.tabs a:hover { background: #ccc; }

table { border-collapse: collapse; width: 100%; margin-top: 10px; }
th, td { border: 1px solid #ccc; padding: 8px; text-align: left; }

.header {
  display: flex;
  align-items: center; 
  gap: 3rem;                  
  padding: 1rem 2rem;
  justify-content: center;
  flex-wrap: wrap;            
}

.logo img {
  width: 200px;    
  height: auto;
}

.dropdown {
  position: relative;
  display: inline-block;
  font-family: Arial, sans-serif;
  cursor: pointer;
  color: white;
}

.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: white;
  min-width: 150px;
  border: 1px solid black;
  z-index: 1;
}

.dropdown-content a {
  display: block;
  padding: 10px;
  text-decoration: none;
  color: black;
}

.dropdown-content a:hover {
  background-color: lightgray;
}

.dropdown:hover .dropdown-content {
  display: block;
}



.buttons {
    display: flex;
    gap: 1rem;                  
    padding: 1rem 2rem;
    justify-content: center;
    flex-wrap: wrap; 
}



.btn {
  display: inline-block;
  padding: 12px 24px;
  font-size: 1.1rem;
  font-weight: bold;
  color: black;
  background: lightblue;
  border: none;
  border-radius: 8px;
  text-decoration: none;
  text-align: center;
  cursor: pointer;
}


.btn:hover {
  background: skyblue;
}

.btn:active {
  background: #004578;
  transform: scale(0.97);
}