:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --fg: #1b1f2a;
  --panel: #ffffff;
  --panel-border: rgba(27, 31, 42, 0.08);
  --accent: #2b51ff;
  --accent-soft: rgba(43, 81, 255, 0.12);
  --radius: 16px;
  --page-padding: clamp(16px, 5vw, 36px);
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: var(--bg);
  color: var(--fg);
  padding: var(--page-padding);
  box-sizing: border-box;
}

.container {
  width: min(780px, 100%);
  display: flex;
  flex-direction: column;
  gap: clamp(12px, 3vw, 20px);
  background: var(--panel);
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--panel-border);
  box-shadow: 0 20px 50px -38px rgba(15, 23, 42, 0.35);
  padding: clamp(18px, 3vw, 26px);
  height: min(860px, calc(100vh - (var(--page-padding) * 2)));
  max-height: calc(100vh - (var(--page-padding) * 2));
  min-height: clamp(420px, 82vh, 860px);
  box-sizing: border-box;
  overflow: hidden;
}

.hero {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 600;
}

.hero p {
  margin: 0 auto;
  max-width: 26rem;
  color: rgba(27, 31, 42, 0.66);
  font-size: 0.95rem;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  background: rgba(246, 247, 251, 0.9);
  border-radius: calc(var(--radius) + 2px);
  padding: clamp(12px, 2vw, 16px);
  border: 1px solid rgba(27, 31, 42, 0.08);
  flex-shrink: 0;
  width: 100%;
  box-sizing: border-box;
}

.control-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
}

.session-button,
button {
  font: inherit;
  border: none;
  border-radius: 999px;
  padding: 11px 22px;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.1s ease, box-shadow 0.1s ease;
}

.session-button,
button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 12px 24px -18px rgba(43, 81, 255, 0.65);
}

.session-button {
  min-width: 150px;
  width: min(220px, 100%);
  font-size: 0.98rem;
  letter-spacing: 0.02em;
}

.session-button[data-state='active'],
button.secondary {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(54, 94, 252, 0.28);
  box-shadow: none;
}

.mic-button {
  min-width: 130px;
  width: min(200px, 100%);
  background: #f0f2f8;
  color: rgba(27, 31, 42, 0.78);
  border: 1px solid rgba(27, 31, 42, 0.12);
  font-size: 0.96rem;
}

.mic-button[data-state='on'] {
  background: rgba(43, 81, 255, 0.16);
  color: var(--accent);
  border-color: rgba(43, 81, 255, 0.32);
  box-shadow: inset 0 0 0 1px rgba(43, 81, 255, 0.12);
}

.session-button:disabled,
button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.session-button:active,
button:active {
  transform: scale(0.97);
}

#status {
  min-height: 1.2em;
  font-size: 0.9rem;
  color: #5a6073;
  text-align: center;
  padding: 4px 14px;
  border-radius: 999px;
  background: #f0f2f8;
  border: 1px solid rgba(27, 31, 42, 0.08);
}

#status[data-tone='error'] {
  color: #d6454f;
}

#status[data-tone='warn'] {
  color: #c8841a;
}

.transcript {
  background: #fdfefe;
  border: 1px solid rgba(27, 31, 42, 0.08);
  border-radius: calc(var(--radius) + 2px);
  padding: clamp(18px, 3.5vw, 26px);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6);
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.transcript h2 {
  margin: 0 0 18px;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: rgba(13, 22, 43, 0.62);
}

.conversation {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1 1 auto;
  overflow-y: auto;
  padding-right: 6px;
  min-height: 0;
}

.conversation::-webkit-scrollbar {
  width: 6px;
}

.conversation::-webkit-scrollbar-thumb {
  background: rgba(27, 31, 42, 0.18);
  border-radius: 999px;
}

.message {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: baseline;
}

.message .label {
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(27, 31, 42, 0.55);
}

.message.user .text {
  background: rgba(43, 81, 255, 0.08);
  border-radius: 12px;
  border: 1px solid rgba(43, 81, 255, 0.14);
}

.message.assistant .text {
  background: rgba(27, 31, 42, 0.04);
  border-radius: 12px;
  border: 1px solid rgba(27, 31, 42, 0.08);
}

.message .text {
  margin: 0;
  padding: 12px 14px;
  line-height: 1.46;
  color: rgba(27, 31, 42, 0.92);
}

@media (max-width: 640px) {
  .message {
    grid-template-columns: 1fr;
  }

  .message .label {
    order: -1;
  }
}