:root {
  --primary: #40E0D0;
  --secondary: #f0f0f0;
  --bg: #ffffff;
  --text: #333333;
  --accent: #cccccc;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Open Sans', sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.container {
  max-width: 700px;
  margin: 3rem auto;
  padding: 2rem;
  background: var(--secondary);
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  flex: 1;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-family: 'Merriweather', serif;
  font-size: 2.5rem;
  color: var(--primary);
  margin: 0.5rem 0;
}

.subtitle {
  font-family: 'Open Sans', sans-serif;
  font-style: italic;
  color: var(--text);
  font-size: 1rem;
  margin-bottom: 1rem;
}

#bio {
  background: var(--secondary);
  padding: 1rem;
  border-left: 4px solid var(--primary);
  margin-bottom: 2rem;
  border-radius: 4px;
}

.collapsible {
  cursor: pointer;
  padding: 1rem;
  width: 100%;
  text-align: left;
  font-size: 1.2rem;
  background-color: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: 4px;
  margin-top: 1rem;
  transition: background-color 0.3s;
}

.collapsible:hover {
  background-color: #33b6b6;
}

.collapsible:after {
  content: ' ▼';
  float: right;
  color: #ffffff;
}

.collapsible.active:after {
  content: ' ▲';
}

.content-section {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 1rem;
  background: var(--bg);
  border-left: 4px solid var(--primary);
  border-radius: 4px;
  margin-bottom: 1rem;
  visibility: hidden;
}

.collapsible.active + .content-section {
  max-height: 2000px;
  visibility: visible;
}

.content-section section {
  padding: 1rem;
  margin-bottom: 1rem;
  border-left: 4px solid var(--primary);
  background: var(--bg);
  border-radius: 4px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}

footer {
  background: var(--secondary);
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  color: var(--text);
  border-top: 2px solid var(--accent);
}