body {
  font-family: "Times New Roman", serif;
    margin: 0;
    padding: 0;
    opacity: 0;
    transform: translateY(100%);
    transition: opacity 1s ease, transform 1s ease;
    background-color: #000;
    color: #fff;
}

body.loaded {
    opacity: 1;
    transform: translateY(0);
}

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
    position:sticky;
    top:0;
}

nav {
    background-color: #333;
    padding: 10px;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    text-align: center;
}

nav ul li {
    display: inline-block;
    margin-right: 10px;
    background-color: #333;
    color: #fff;
}

nav ul li a {
    text-decoration: none;
    color: #fff;
    padding: 5px;
    position: relative;
}

nav ul li a::after {
    content: "";
    display: block;
    position: absolute;
    bottom: -2px;
    right: 0;
    width: 0;
    height: 2px;
    background-color: #e7e3e3;
    transition: width 0.3s ease;
}

nav ul li a:hover::after {
    width: 100%;
    right: inherit;
    left: 0;
    transition: width 0.3s ease, left 0.3s ease;
}

section {
    margin: 20px;
    color: #fff;
}

footer {
    background-color: #333;
    color: #fff;
    padding: 10px;
    text-align: center;
}

.btn {
    color: #f8fcfe;
    background: transparent;
    border: 2px solid #f8fcfd;
    border-radius: 5px;
    color: white;
    padding: 8px 16px;
    text-align: center;
    display: inline-block;
    font-size: 14px;
    margin: 4px 2px;
    transition-duration: 0.4s;
    cursor: pointer;
    text-decoration: none;
    font-family: "Times New Roman", serif;
}

.btn1 {
  background-color: transparent;
  color: white;
  border: 2px solid #f8fcfd;
  padding: 6px 12px;
  font-size: 12px;
  transition-duration: 0.3s;
  font-family: "Times New Roman", serif;
}

.btn1:hover {
  background-color: white;
  color: black;
}

.dropdown {
    position: relative;
    float: right;
    text-align: right;
    left: -50px;
  }
  
  .dropdown-btn {
    background-color: transparent;
    color: white;
    border: 2px solid #f8fcfd;
    border-radius: 5px;
    padding: 8px 16px;
    font-size: 14px;
  }
  
  .dropdown-content {
    opacity: 0;
    visibility: hidden;
    position: absolute;
    z-index: 1;
    background-color: #f9f9f9;
    width: 100%;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
    padding: 12px 16px;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    text-align: center;
    white-space: nowrap;
    border-radius: 5px; 
  }
  
  .dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
  }
  
  .dropdown-content a:hover {
    background-color: #f1f1f1;
  }
  
  .dropdown:hover .dropdown-content {
    opacity: 1;
    visibility: visible;
  }
  
  .dropdown:hover .dropbtn {
    background-color: white;
    color: black;
  }

.card {
    flex: 0 0 calc(33.33% - 20px);
    margin-bottom: 20px;
    margin-right: 20px;
    max-width: 400px;
    color: #fff;
    background-color: #333;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.5);
    transition: transform 0.3s ease;
}
.card:last-child {
    margin-right: 0;
}
.card:hover {
    transform: translateY(-5px);
}

@keyframes shake {
    0% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-10px); }
    20%, 40%, 60%, 80% { transform: translateX(10px); }
    100% { transform: translateX(0); }
  }
  
  .error-404 {
    animation: shake 0.5s ease-in-out 1;
  }

  .card-container {
    display: flex;
    flex-wrap: wrap;
}

.stm-container {
  display: grid;
  grid-gap: 20px;
  margin-left: 10px;
}

@media (min-width: 600px) {
  .stm-container {
      grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 900px) {
  .stm-container {
      grid-template-columns: repeat(4, 1fr);
  }
}

  .column {
    width: 100%;
    margin-bottom: 20px;
  }
  
  .tree {
    color: #0366d6;
  }
  
  .menu {
    display: grid;
    grid-template-columns: 1fr;
    gap: 5px;
    cursor: pointer;
    justify-content: center;
  }
  
  @media (min-width: 600px) {
    .menu {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
    }
  }

  #bottom-iframe {
    position: absolute;
    top: calc(100% + 20px); 
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    overflow: hidden;
  }

  .solid-line::before {
    content: "";
    display: block;
    border-bottom: 1px solid #858282;
    margin-bottom: 10px;
  }

  img{
    border-radius: 10px;
  }
  
  .cw{
    position: fixed;
    top: 5px;
    left: 20px;
    z-index: 9999;
    cursor: pointer;
  }
      
  .container {
    margin-left: 10px;
  }

  a {
    color: #0366d6;
  }