body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  background: #f4f4f4;
  color: #222;
}

.nav-bar {
  background-color: #00264d;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  color: white;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}

.content-container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 2rem;
  background: white;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h2 {
  color: #00264d;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  margin-top: 1rem;
  background-color: #ff6600;
  color: white;
  text-decoration: none;
  border-radius: 4px;
}

/* === Chapter Page Styles === */

.chapter-wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: 30px 20px;
}

.course-progress-label {
  font-weight: bold;
  margin-bottom: 8px;
  display: inline-block;
}

.course-progress-bar {
  background: #e0e0e0;
  border-radius: 8px;
  height: 24px;
  overflow: hidden;
}

.course-progress-fill {
  background: #28a745;
  color: white;
  padding-left: 10px;
  line-height: 24px;
  width: 25%;
}

.chapter-box {
  border: 1px solid #ccc;
  border-radius: 8px;
  padding: 25px;
  background: #fff;
}

.chapter-box h2 {
  color: #007bff;
  margin-bottom: 20px;
}

.quiz-btn {
  display: inline-block;
  padding: 10px 20px;
  font-size: 18px;
  background: #007bff;
  color: white;
  border-radius: 5px;
  text-decoration: none;
}

.quiz-btn:hover {
  background: #0056b3;
  text-decoration: none;
}

.quiz-complete-msg {
  color: green;
  font-weight: bold;
}