* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #0d0f14;
  color: #e8eaf0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.app {
  max-width: 640px;
  margin: 0 auto;
  padding: 32px 16px 64px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  margin: 0 0 4px;
  font-size: 26px;
}

.subtitle {
  margin: 0 0 24px;
  color: #9aa3b2;
  font-size: 14px;
  text-align: center;
}

#micBtn {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 2px solid #2c3242;
  background: #161a24;
  font-size: 36px;
  cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
}

#micBtn:hover {
  transform: scale(1.05);
}

#micBtn.listening {
  border-color: #e5484d;
  box-shadow: 0 0 24px rgba(229, 72, 77, 0.45);
  animation: pulse 1.6s infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 16px rgba(229, 72, 77, 0.35); }
  50% { box-shadow: 0 0 32px rgba(229, 72, 77, 0.65); }
}

.status {
  margin: 14px 0 20px;
  color: #9aa3b2;
  font-size: 14px;
  min-height: 20px;
}

.messages {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 15px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg.user {
  align-self: flex-end;
  background: #2451b3;
  border-bottom-right-radius: 4px;
}

.msg.agent {
  align-self: flex-start;
  background: #1c212e;
  border: 1px solid #2c3242;
  border-bottom-left-radius: 4px;
}

.event {
  align-self: center;
  color: #6b7484;
  font-size: 12px;
  font-style: italic;
}

.hint {
  margin-top: 24px;
  color: #6b7484;
  font-size: 13px;
  text-align: center;
}