/* General Reset and Base Styles */
body, html {
  margin: 0;
  padding: 0;
  font-family: 'Arial', sans-serif;
  font-size: 16px;
  color: #222;
  background-color: #f9f9f9;
  line-height: 1.5;
}

* {
  box-sizing: border-box;
}

/* Accessibility: Improved focus visibility */
:focus {
  outline: 2px solid #5a8deb;
  outline-offset: 2px;
}

/* Header Styles */
#app-header {
  background-color: #3d74b7;
  color: #fff;
  text-align: center;
  padding: 20px 10px;
  border-bottom: 4px solid #2a5783;
}

#app-header h1 {
  margin: 0;
  font-size: 2.5rem;
}

#app-header p {
  margin: 5px 0 0;
  font-size: 1.2rem;
  font-weight: 300;
}

/* Transition Effects */
a {
  transition: color 0.3s ease;
}

a:hover, a:focus {
  color: #5a8deb;
}

/* Main Content Styles */
#app-main {
  padding: 20px;
  max-width: 900px;
  margin: 0 auto;
}

section {
  margin-bottom: 30px;
  padding: 20px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

section h2 {
  margin: 0 0 15px;
  font-size: 1.8rem;
  color: #3d74b7;
  border-bottom: 2px solid #e0e0e0;
  padding-bottom: 5px;
}

/* Student Profile Section */
#student-profile label {
  display: block;
  font-weight: bold;
  margin-bottom: 10px;
}

#profile-select {
  width: 100%;
  padding: 10px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  margin-bottom: 20px;
}

#profile-details {
  background-color: #f2f7ff;
  padding: 15px;
  border: 1px solid #d4e2f7;
  border-radius: 4px;
}

#profile-details h3 {
  margin: 0 0 10px;
  font-size: 1.5rem;
  color: #357ABD;
}

/* Learning Path Section */
#learning-path button {
  display: block;
  width: 100%;
  padding: 10px 15px;
  font-size: 1rem;
  font-weight: bold;
  color: #fff;
  background-color: #5a8deb;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

#learning-path button:hover, #learning-path button:focus {
  background-color: #4582cf;
}

#path-results {
  margin-top: 20px;
  background-color: #f2f7ff;
  padding: 15px;
  border: 1px solid #d4e2f7;
  border-radius: 4px;
}

#path-results h3 {
  margin: 0 0 10px;
  font-size: 1.5rem;
  color: #357ABD;
}

/* Additional Controls */
#learning-rate {
  width: 100%;
  margin-bottom: 10px;
}

#additional-controls label {
  display: block;
  font-weight: bold;
  margin-top: 20px;
}

#difficulty-level {
  width: 100%;
  padding: 10px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  margin-bottom: 10px;
}

/* Footer Styles */
#app-footer {
  text-align: center;
  padding: 15px;
  background-color: #3d74b7;
  color: #fff;
  font-size: 0.9rem;
  border-top: 4px solid #2a5783;
}

/* Utility Classes */
button:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

p, label {
  margin: 0;
}

p {
  margin-bottom: 10px;
}

/* Inline Feedback Messages */
.inline-message {
  position: fixed;
  bottom: 20px;
  left: 20px;
  padding: 10px 15px;
  border-radius: 5px;
  font-size: 1rem;
  color: #fff;
  z-index: 1000;
}

.inline-message.success {
  background-color: #4caf50;
}

.inline-message.error {
  background-color: #f44336;
}