body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f8f8f8;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  max-width: 800px;
  width: 100%;
  margin: 120px auto;
  padding: 40px;
  background-color: #ffffff;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  border-radius: 10px;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #606060;
  font-size: 2rem;
  font-weight: bold;
}

.quiz-container {
  margin-bottom: 30px;
}

h2 {
  font-size: 1.5rem;
  font-weight: bold;
  margin-bottom: 20px;
  color: #323131;
}

h3 {
  font-size: 1rem;
  margin-bottom: 20px;
  margin-top: 40px;
  color: #606060;
}

input[type="radio"] {
  display: none;
}

label {
  display: block;
  background-color: #f8f8f8;
  border: 1px solid #d6d6d6;
  border-radius: 5px;
  padding: 15px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: background-color 0.2s, border-color 0.2s;
  font-size: 1.2rem;
  color: #323131;
}

input[type="radio"]:checked + label {
  background-color: #5ea6b1;
  border-color: #5ea6b1;
  color: #ffffff;
}

.action-btn {
  display: inline-block;
  width: 130px;
  padding: 15px;
  background-color: #4caf50;
  color: white;
  font-weight: bold;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.2s;
  margin-bottom: 20px;
  text-align: center;
  font-size: 1.2rem;
}

.try-again {
  margin-left: 0px;
}

#back {
  float: left;
  background-color: transparent;
  border: 2px solid #4caf50;
  color: #4caf50;
}

#next {
  float: right;
}

.action-btn:disabled {
  background-color: #a5d6a7;
  color: white;
  cursor: not-allowed;
}

.hidden {
  display: none;
}

.result {
  text-align: left;
  padding: 0px;
  background-color: #ffffff;
}

.result h2 {
  margin-bottom: 30px;
  font-size: 1.5rem;
  font-weight: bold;
  color: #323131;
  padding-top: 20px;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

ol {
  list-style: none;
  margin: 0;
  padding-left: 0px;
  padding-bottom: 20px;

}

li {
  margin-bottom: 5px;
  font-size: 1.0rem;
  color: #323131;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px;
  border-radius: 5px;
  background-color: #f8f8f8;
}

.highlight {
  color: #323131;
  padding: 10px;
  border-radius: 5px;
  background-color: lightgreen;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 50px;
  background-color: #ffffff;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 999;
}

.logo img {
  height: 50px;
}

.header-right {
  display: flex;
  align-items: center;
}

.login-btn {
  text-align: center;
  text-decoration: none;
  vertical-align: middle;
  padding: 0.25rem 0.5rem;
  font-size: 0.875rem;
  border-radius: 0.2rem;
  color: #fff;
  background-color: #0d6efd;
  border-color: #0d6efd;
  border: 1px solid transparent;
  box-sizing: border-box;
  font-weight: 400;
  line-height: 1.5;
}

.courses-link {
  color: #0d6efd;
  font-size: 16px;
  text-decoration: none;
  transition: color 0.2s;
  padding-right: 0.5rem;
  font-weight: 400;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
}

.courses-link:hover {
  color: #458bf4;
}