body {
  background-color: #ffffff;
  color: #000000;
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

header {
  border-bottom: 1px solid #000000;
  background-color: #f0f0f0;
  padding: 20px 0;
}

.header-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

.brand {
  font-size: 1.5rem;
  font-weight: bold;
}

.course-title {
  font-size: 1rem;
  color: #333333;
  margin-bottom: 15px;
}

nav ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

nav ul li {
  display: inline;
  margin-right: 20px;
}

nav a {
  color: #0000ee;
  text-decoration: none;
  font-size: 1rem;
}

nav a:hover,
nav a.active {
  text-decoration: underline;
  font-weight: bold;
}

main {
  max-width: 800px;
  margin: 30px auto;
  padding: 0 20px;
}

h1.page-title {
  font-size: 1.5rem;
  border-bottom: 1px solid #cccccc;
  padding-bottom: 10px;
  margin-bottom: 20px;
}

/* Profile Box */
.profile-box {
  border: 1px solid #000000;
  padding: 20px;
  background-color: #fafafa;
}

.profile-header {
  border-bottom: 1px dashed #cccccc;
  padding-bottom: 10px;
  margin-bottom: 15px;
}

.p-avatar {
  display: none; /* Hidden for a simpler look */
}

.p-info h2 {
  margin: 0;
  font-size: 1.25rem;
}

.p-info p {
  margin: 5px 0 0 0;
  color: #444444;
}

/* Sample Layout */
.sample-grid {
  display: block;
}

.sample-card {
  border: 1px solid #999999;
  padding: 15px;
  margin-bottom: 25px;
  background-color: #ffffff;
}

.sample-title {
  font-size: 1.1rem;
  margin-top: 0;
  border-bottom: 1px solid #eeeeee;
  padding-bottom: 5px;
}

.sample-desc {
  font-size: 0.95rem;
  margin-bottom: 15px;
  color: #333333;
}

/* Forms */
.input-group {
  margin-bottom: 15px;
}

.input-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

input[type="text"],
input[type="number"],
select {
  padding: 5px;
  border: 1px solid #666666;
  width: 300px;
  max-width: 100%;
}

button {
  padding: 5px 15px;
  border: 1px solid #000000;
  background-color: #e0e0e0;
  color: #000000;
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
}

button:hover {
  background-color: #cccccc;
}

/* Outputs */
.output-area {
  margin-top: 15px;
  padding: 10px;
  border: 1px dashed #666666;
  background-color: #f9f9f9;
}

.output-label {
  font-weight: bold;
  font-size: 0.9rem;
  margin-bottom: 5px;
}

.output-content {
  font-family: monospace;
  font-size: 1rem;
  white-space: pre-wrap;
}

/* Footer */
footer {
  text-align: center;
  border-top: 1px solid #aaaaaa;
  padding: 15px 0;
  margin-top: 40px;
  font-size: 0.85rem;
}

/* Utilities */
.mb-1,
.mb-2,
.mb-3,
.mb-4 {
  margin-bottom: 15px;
}
.text-center {
  text-align: left; /* Kept left-aligned to stick to default document flow */
}