:root {
  --charcoal: #555555;
  --dark-gray: #808080;
  --medium-gray: #d3d3d3;
  --light-gray: #dcdcdc;
  --ghost: #f8f9fa;
  --white: #ffffff;
}

body {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  background-color: var(--ghost);
  var(--charcoal);
  margin: 0;
  padding: 0;
}

.container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: var(--charcoal);
  color: var(--white);
  padding: 1.5rem;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.content-wrapper {
  display: flex;
  flex: 1;
}

.sidebar {
  width: 225px;
  background-color: var(--dark-gray);
  color: var(--white);
  padding: 1.5rem;
  box-shadow: 2px 0 5px rgba(0,0,0,0.1);
}

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

.sidebar nav li {
  margin-bottom: 1rem;
}

.sidebar nav a {
  color: var(--white);
  text-decoration: none;
  display: block;
  padding: 0.5rem 0;
  transition: color 0.3s ease;
}

.sidebar nav a:hover {
  color: var(--light-gray);
}

.main-content {
  flex: 1;
  padding: 2rem;
  background-color: var(--white);
  box-shadow: 0 0 5px rgba(0,0,0,0.05);
  min-height: calc(100vh - 200px); /* Adjust based on header/footer height */
}

.profile-pic {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--white);
}

.profile-info {
  display: flex;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.profile-text {
  margin-left: 2rem;
}

.profile-text h1 {
  margin: 0 0 0.5rem 0;
  font-size: 1.8rem;
}

.profile-text h3 {
  margin: 0 0 0.5rem 0;
  font-size: 1.2rem;
  font-weight: normal;
  color: var(--white);
}

.profile-text p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--white);
}

.content-section {
  display: none; /* All sections hidden by default */
}

.content-section.default-section {
  display: block; /* Only welcome section visible initially */
}

h2 {
  color: var(--charcoal);
  border-bottom: 2px solid var(--light-gray);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

h3 {
  color: var(--charcoal);
}

a {
  color: var(--charcoal);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  var(--charcoal);
  text-decoration: underline;
}

.iframe-container {
  width: 100%;
  height: 450px;
  border: 1px solid var(--light-gray);
  border-radius: 4px;
  overflow: hidden;
}

.iframe-container iframe {
  width: 100%;
  height: 100%;
}

footer {
  background-color: var(--charcoal);
  var(--white);
  padding: 1rem;
  text-align: center;
  font-size: 0.9rem;
}

/* Responsive design */
@media (max-width: 768px) {
  .content-wrapper {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    padding: 1rem;
  }
  
  .profile-info {
    flex-direction: column;
    text-align: center;
  }
  
  .profile-text {
    margin-left: 0;
    margin-top: 1rem;
  }
  
  .main-content {
    padding: 1.5rem;
    min-height: auto;
  }
}