body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f6f8;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px;
}

.messages {
  min-height: 320px;
  max-height: 500px;
  overflow-y: auto;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 12px;
}

.msg {
  border-bottom: 1px solid #eee;
  padding: 8px 0;
}

.msg header {
  display: flex;
  justify-content: space-between;
}

.message-form {
  display: grid;
  grid-template-columns: 160px 1fr 120px;
  gap: 8px;
}

.burst-controls {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}