body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background: #f9f9f9;
}
.header {
  text-align: center;
  padding: 20px 20px 10px 20px;
}
.logo {
  width: 320px;
  height: auto;
  margin-bottom: 10px;
}
.ad-banner {
  margin: 15px auto;
  text-align: center;
}
.main-title {
  font-size: 26px;
  font-weight: bold;
  margin: 10px 0 5px 0;
}
.subtitle {
  font-size: 16px;
  color: #777;
  margin: 0;
}
.quiz-container {
  max-width: 500px;
  background: #fff;
  margin: 20px auto;
  padding: 25px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}
.progress-bar {
  display: flex;
  justify-content: space-between;
  margin-bottom: 20px;
}
.step {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ccc;
}
.step.active {
  background: #007bff;
}
#question {
  font-size: 18px;
  margin-bottom: 20px;
  font-weight: 500;
}
.option-btn {
  width: 100%;
  background: #007bff;
  color: white;
  border: none;
  padding: 12px;
  margin: 8px 0;
  border-radius: 6px;
  font-size: 15px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
}
.option-btn:hover {
  background: #0056b3;
}
.jump-link {
  margin-top: 20px;
  text-align: center;
}
.jump-link a {
  text-decoration: none;
  color: #007bff;
  font-size: 14px;
}
.footer {
  text-align: center;
  font-size: 12px;
  color: #333;
  margin: 30px 0 15px 0;
}
.footer a {
  color: #333;
  text-decoration: none;
  margin: 0 5px;
}