body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f0f4f8;
  color: #333;
  margin: 0;
  display: flex;
  height: 100vh;
  overflow: hidden;
}
#app-container {
  display: flex;
  width: 100%;
  height: 100%;
}
aside#side-nav {
  width: 280px;
  background-color: #ffffff;
  padding: 25px;
  box-shadow: 2px 0 10px rgba(0, 0, 0, 0.05);
  overflow-y: auto;
  flex-shrink: 0;
}
#side-nav h1 {
  color: #005a9c;
  font-size: 1.4em;
  margin: 0 0 30px 0;
  border-bottom: 2px solid #e3f2fd;
  padding-bottom: 15px;
}
#side-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
#side-nav li a {
  display: block;
  padding: 10px 15px;
  color: #003366;
  text-decoration: none;
  border-radius: 8px;
  margin-bottom: 10px;
  font-weight: 500;
  transition: background-color 0.3s;
}
#side-nav li a:hover {
  background-color: #e3f2fd;
}
main#content-area {
  flex-grow: 1;
  padding: 30px;
  overflow: auto;
  display: flex;
  justify-content: center;
  align-items: center;
}
#content-wrapper {
  width: 816px;
  height: 1056px;
  max-width: 100%;
  max-height: 100%;
  background-color: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  overflow: auto;
}
aside#ai-panel {
  width: 360px;
  background-color: #ffffff;
  box-shadow: -2px 0 10px rgba(0, 0, 0, 0.05);
  flex-shrink: 0;
}
#ai-panel iframe {
  width: 100%;
  height: 100%;
  border: none;
}