* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: rgb(72, 72, 160);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.quiz-container {
  background-color: #407240;
  ;
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 500px;
}

.timer {
  font-size: 18px;
  font-weight: bold;
  text-align: right;
  margin-bottom: 15px;
  color: #ff4d4d;
}

.question-box {
  margin-bottom: 20px;
}

.question {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 15px;
}

.options {
  list-style: none;
}

.option-btn {
  width: 100%;
  padding: 10px 15px;
  margin-bottom: 10px;
  background-color: #e6f0ff;
  border: 2px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.option-btn:hover {
  background-color: #cce0ff;
  border-color: #3399ff;
}

.navigation-buttons {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
}

.nav-btn {
  padding: 10px 20px;
  background-color: rgb(72, 72, 160);
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: bold;
  transition: background 0.3s ease;
}

.nav-btn:hover {
  background-color: #0b0d0f;
}

.result {
  margin-top: 25px;
  font-size: 18px;
  text-align: center;
  font-weight: 500;
}