body {
  font-family: Arial, sans-serif;
  background: #f8fafc;
  margin: 0;
  color: #1e293b;
}
header {
  display: flex;
  align-items: center;
  justify-content: start;
  padding: 1rem;
  background: #fff;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.logo {
  background: linear-gradient(135deg, #6366f1, #ec4899);
  color: white;
  font-weight: bold;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  margin-right: 1rem;
}
main {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  gap: 1rem;
  padding: 1rem;
}
.sidebar, .content, .chat {
  background: #fff;
  border-radius: 10px;
  padding: 1rem;
  box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}
.video-area {
  background: #000;
  color: white;
  text-align: center;
  padding: 3rem 1rem;
  border-radius: 8px;
}
.chat .messages {
  height: 200px;
  overflow-y: auto;
  margin-bottom: 0.5rem;
}
.msg {
  margin: 0.5rem 0;
  padding: 0.5rem;
  border-radius: 8px;
  max-width: 80%;
}
.msg.left {
  background: #e2e8f0;
  align-self: start;
}
.msg.right {
  background: #6366f1;
  color: white;
  align-self: end;
  margin-left: auto;
}
footer {
  text-align: center;
  font-size: 0.8rem;
  color: #64748b;
  padding: 1rem;
}