/* Course Page Specific Styles */
:root {
  --primary-color: #007bff;
  --secondary-color: #6c757d;
  --bg-dark: #2c3e50;
  --bg-light: #ecf0f1;
  --text-color: #34495e;
  --card-bg: #fff;
}

body {
  scroll-behavior: smooth;
  font-family: 'Segoe UI', Arial, sans-serif;
  color: var(--text-color);
  background-color: var(--bg-light);
}


.hero-section p.lead {
  font-size: 1.4rem;
  /* Larger lead text */
  font-weight: 300;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}


.hero-section h1 {
  font-weight: 700;
}

/* Sidebar Styles */
.sidebar {
  background-color: var(--bg-dark);
  color: #fff;
  border-radius: 0.5rem;
  padding: 1rem;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.sidebar .nav-link {
  font-size: 1rem;
  padding: 10px 15px;
  color: rgba(255, 255, 255, 0.7);
  transition: all 0.3s ease-in-out;
  border-left: 3px solid transparent;
}

.sidebar .nav-link:hover {
  color: #fff;
  border-left-color: var(--primary-color);
  background-color: rgba(255, 255, 255, 0.1);
}

.sidebar .nav-link.active {
  background-color: var(--primary-color);
  color: white !important;
  border-radius: 4px;
  border-left-color: var(--primary-color);
  font-weight: bold;
}

/* Main Content Cards */
.content-card {
  background-color: var(--card-bg);
  border-radius: 0.75rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  padding: 1.5rem;
  border: none;
}

.content-card .card-header {
  background-color: #f8f9fa;
  border-bottom: 1px solid #e9ecef;
  border-top-left-radius: 0.75rem;
  border-top-right-radius: 0.75rem;
  padding: 1rem 1.5rem;
}

.content-card h2.card-title {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 0;
}

/* Equations Styling */
pre {
  background-color: #f4f6f9;
  border-left: 4px solid var(--primary-color);
  padding: 1rem;
  font-family: 'Consolas', 'Courier New', monospace;
  overflow-x: auto;
  border-radius: 0.25rem;
}

/* Quiz Accordion Styles */
.accordion-item {
  border: none;
  border-bottom: 1px solid #e9ecef;
}

.accordion-button {
  background-color: var(--card-bg);
  color: var(--text-color);
  font-weight: 500;
}

.accordion-button:not(.collapsed) {
  background-color: var(--primary-color);
  color: white;
  border-bottom: none;
}

.accordion-button:focus {
  box-shadow: 0 0 0 0.25rem rgba(0, 123, 255, 0.25);
}

.accordion-body {
  background-color: #f8f9fa;
  color: var(--text-color);
  border-bottom-left-radius: 0.75rem;
  border-bottom-right-radius: 0.75rem;
}
.definition-box {
      background-color: #e9f5ff;
      border-left: 5px solid #007bff;
      padding: 15px 20px;
      border-radius: 8px;
      margin-bottom: 20px;
      font-style: italic;
      color: #0056b3;
    }
    .test-your-knowledge {
      background-color: #fff3cd;
      border-left: 5px solid #ffc107;
      padding: 20px;
      border-radius: 8px;
      margin-top: 40px;
      margin-bottom: 30px;
    }

    .test-your-knowledge h4 {
      color: #856404;
      font-weight: 700;
      margin-bottom: 15px;
    }

    .test-your-knowledge ol li {
      margin-bottom: 10px;
      color: #343a40;
    }