/* Cards */
.card {
  background-color: #2b373d;
  color: #c7cad;
  font-weight: bold;
  font-size: 16px;	
  border: 2px solid #c7cad;
  border-radius: 5px;
  padding: 30px;
  margin: 10px;
  text-align: center;
  cursor: pointer;
  text-transform:uppercase;	
  transition: all 0.3s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  box-sizing: border-box;
}

.card:hover {
  background-color: #000;
  text-transform:uppercase;		
  font-weight: bold;
  transform: translateY(-5px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.col-6,
.col-lg-4 {
  position: relative;
  width: 100%;
  padding-right: 5px;
  padding-left: 5px;
}


.btn {
  display: inline-block;
  font-weight: 400;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  background-color: #007bff;
  border: 1px solid #007bff;
  color: #ffffff;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: 0.25rem;
  transition: all 0.3s ease;
  margin-bottom: 20px;
  text-decoration: none;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn:hover {
  background-color: #0069d9;
  border-color: #0062cc;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

#chapters-container,
#chapter-content-container {
  position: relative;
  z-index: 1;
}

.hidden {
  display: none;
}

@media (max-width: 575px) {
  .card {
    width: calc(90%);
    margin: 10px;
  }
}

@media (min-width: 576px) {
  .card {
    width: 90%;
    margin: 10px;
  }
}

@media (min-width: 768px) {
  .col-6 {
    flex: 0 0 50%;
    max-width: 50%;
  }
}

@media (min-width: 992px) {
  .col-lg-4 {
    flex: 0 0 33.333333%;
    max-width: 33.333333%;
  }
}

/* Search Input */
.search-container {
  display: flex;
  justify-content: left;
  margin-top: 10px;
}

.search-input {
  padding: 15px;
  border-radius: 0px;
  border: 2px solid #2b373d;
  width: 100%;
  max-width: 600px;
  transition: all 0.3s ease;
  font-size: 25px;
  background-color: #c7cad;
}

.search-input:focus {
  outline: none;
  border-color: #007bff;
  box-shadow: 0 0 10px rgba(0, 123, 255, 0.3);
  background-color: #ffffff;
}

@media (min-width: 576px) {
  .search-container {
    margin-top: 0;
  }
}