:root {
  color-scheme: light;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f7f8;
  color: #172026;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: #f5f7f8;
}

.app-shell {
  width: min(760px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  padding: 18px 14px 24px;
  gap: 14px;
}

header {
  padding: 6px 2px 2px;
}

h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
  letter-spacing: 0;
}

.chat {
  flex: 1;
  min-height: 420px;
  overflow-y: auto;
  border: 1px solid #d8dee4;
  background: #ffffff;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message {
  display: grid;
  gap: 5px;
}

.speaker {
  font-size: 14px;
  font-weight: 700;
  color: #5c6975;
}

.bubble {
  width: fit-content;
  max-width: 92%;
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 18px;
  line-height: 1.45;
  white-space: pre-wrap;
}

.ai .bubble {
  background: #eef3f2;
  color: #14231f;
}

.user {
  justify-items: end;
}

.user .speaker {
  color: #45515c;
}

.user .bubble {
  background: #1f6feb;
  color: #ffffff;
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
}

input,
button {
  min-height: 48px;
  border-radius: 8px;
  font-size: 18px;
}

input {
  width: 100%;
  border: 1px solid #c9d1d9;
  padding: 0 12px;
}

button {
  border: 0;
  padding: 0 18px;
  background: #116329;
  color: #ffffff;
  font-weight: 700;
  cursor: pointer;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.voice-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: center;
}

#voiceButton.connected {
  background: #9a3412;
}

#voiceStatus {
  font-size: 15px;
  color: #4b5563;
}

.debug {
  border-top: 1px solid #d8dee4;
  padding-top: 10px;
  font-size: 14px;
}

.debug summary {
  cursor: pointer;
  font-weight: 700;
}

.debug dl {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 7px 10px;
  margin: 10px 0 0;
}

.debug dt {
  color: #5c6975;
}

.debug dd {
  margin: 0;
  word-break: break-word;
}

@media (max-width: 520px) {
  .app-shell {
    padding: 14px 10px 18px;
  }

  h1 {
    font-size: 24px;
  }

  .chat {
    min-height: 52vh;
  }

  .composer,
  .voice-row {
    grid-template-columns: 1fr;
  }

  .bubble {
    max-width: 96%;
    font-size: 17px;
  }
}