body {
  font-family: Arial, sans-serif;
  margin: 0;
  background-color: #f7f9fc;
  color: #222;
  line-height: 1.6;
}

.site-header {
  background-color: #1f3c88;
  color: white;
  text-align: center;
  padding: 35px 20px;
}

.site-header h1 {
  margin: 0;
  font-size: 34px;
  letter-spacing: 1px;
}

.site-header p {
  margin-top: 10px;
  font-size: 18px;
}

.navbar {
  background-color: #e9eef5;
  padding: 15px;
  text-align: center;
}

.navbar a {
  margin: 0 18px;
  text-decoration: none;
  color: #1f3c88;
  font-weight: bold;
  font-size: 17px;
  padding: 8px 10px;
  border-radius: 5px;
}

.navbar a:hover {
  background-color: #1f3c88;
  color: white;
}

.navbar a.active {
  background-color: #1f3c88;
  color: white;
}

.container {
  max-width: 950px;
  margin: auto;
  padding: 35px 25px;
}

.hero-card,
.info-card,
.topic-card,
.interactive-box,
.form-card {
  background-color: white;
  border: 1px solid #ddd;
  border-radius: 10px;
  padding: 25px;
  margin-bottom: 22px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.hero-card h2,
.interactive-box h2 {
  color: #1f3c88;
  margin-top: 0;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.info-card h3,
.topic-card h3 {
  color: #1f3c88;
  margin-top: 0;
}

.topic-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.button-link,
button {
  display: inline-block;
  background-color: #1f3c88;
  color: white;
  padding: 10px 16px;
  border: none;
  border-radius: 5px;
  text-decoration: none;
  cursor: pointer;
  font-size: 15px;
}

.button-link:hover,
button:hover {
  background-color: #14275c;
}

pre {
  background-color: #eef2f7;
  border-left: 5px solid #1f3c88;
  padding: 15px;
  overflow-x: auto;
  margin-top: 15px;
}

.hidden {
  display: none;
}

#quizResult,
#formMessage {
  font-weight: bold;
  color: #1f3c88;
  margin-top: 15px;
}

form {
  max-width: 420px;
}

label {
  display: block;
  margin-top: 12px;
  font-weight: bold;
}

input,
textarea {
  width: 100%;
  padding: 10px;
  margin-top: 6px;
  border: 1px solid #aaa;
  border-radius: 5px;
  font-size: 15px;
}

footer {
  background-color: #1f3c88;
  color: white;
  text-align: center;
  padding: 18px;
  margin-top: 30px;
}

@media screen and (max-width: 750px) {
  .content-grid,
  .topic-list {
    grid-template-columns: 1fr;
  }

  .navbar a {
    display: block;
    margin: 8px 0;
  }

  .site-header h1 {
    font-size: 28px;
  }
}