body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f4f8;
}
footer {
  background-color: #2980b9;
  text-align: center;
  padding: 1rem;
  color: #1e1e1e;
  font-size: 0.9rem;
  border-top: 2px solid #2980b9;
  margin-top: 35px;
}
header {
    background: #3498db;
    color: white;
    padding: 10px 20px;
    display: center;
    align-items: center;
    justify-content: space-between;
    border-bottom: 2px solid #2980b9;
    height: 100px;
    
}

main {
    margin-left: 20px;
    margin-top: 80px;
    padding: 20px;
}


.link-button {
    padding: 10px 20px;
    background-color: #3498db;
    border: none;
    border-radius: 30px;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

.link-button:hover {
    background-color: #2980b9;
    transform: scale(1.05);
}

#loader {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    visibility: visible;
    opacity: 1;
    transition: opacity 2s ease-out, visibility 2s ease-out;
  }


  #loader img {
    width: 650px;
    height: 650px;
    animation: rotate 2s infinite linear;
  }
  #content {
    visibility: hidden;
    opacity: 0;
    transition: opacity 2s ease-in, visibility 2s ease-in;
  }
  body.loaded #loader {
    visibility: hidden;
    opacity: 0;
  }

  body.loaded #content {
    visibility: visible;
    opacity: 1;
  }
  #gora{
    font-size: 40px;
    font-weight: 700;
    width: 1321px;
    height: 122px;
  }
  o{
    font-size: 40px;
    font-weight: 700;
    border-right: 1px white;
    
  }
  .strg{
    padding: 10px 20px;
    background-color: #183a52;
    border: none;
    border-radius: 30px;
    color: white;
    font-size: 16px;
    
  }
  #linkdogownej{
    padding: right;
    font-size: 24px;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
  }
  th{
    border: solid 2px black;
  }
/* Do wyszukiwasrki*/
  .hidden { display: none; }
  .category { padding: 6px; margin: 4px 0; border-radius: 4px; }
  #searchInput { height: 35px; width: 200px; border-radius: 30px; margin-top: 5px;}
/* Do wyszukiwasrki*/
  button {
    padding: 10px 20px;
    background-color: #183a52;
    border: none;
    border-radius: 30px;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}
h3{
  visibility: hidden;
}
select{
  width: 177px;
}
#csvFile{
    padding: 10px 20px;
    background-color: #183a52;
    border: none;
    border-radius: 30px;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}
  #planLekcji {
    display: flex;
    justify-content: center;
    margin-top: 20px;
  }

  #csvTable {
    border-collapse: collapse;
    width: auto;
    max-width: 90%;
  }

  #csvTable td,
  #csvTable th {
    border: 1px solid #555;
    padding: 8px 12px;
    text-align: left;
  }

  #csvTable tr:nth-child(even) {
    background-color: #f9f9f9;
  }

  #csvTable tr:hover {
    background-color: #f1f1f1;
  }