:root {
  color-scheme: light dark;

  --bg: #f6f6f4;
  --surface: #ffffff;
  --border: #e2e1dd;
  --text: #1c1b19;
  --muted: #6f6d67;
  --accent: #2f6f4f;
  --accent-soft: #e6f0ea;
  --danger: #a23a2c;
  --danger-soft: #fbeae7;

  --level: 0;
  --mic-level: 0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --surface: #202224;
    --border: #32353a;
    --text: #eceae5;
    --muted: #97948d;
    --accent: #7fcba2;
    --accent-soft: #1e2f27;
    --danger: #e8877a;
    --danger-soft: #33211f;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  min-height: 100vh;
}

.shell {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 48px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* ─── Cabeçalho ─────────────────────────────────────────────── */

.head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

h1 {
  font-size: 19px;
  font-weight: 600;
  margin: 0;
  letter-spacing: -0.01em;
}

.engine {
  font-size: 12.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ─── Avatar ────────────────────────────────────────────────── */

.stage {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 36px 24px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.avatar {
  --size: 132px;
  width: var(--size);
  height: var(--size);
  border-radius: 50%;
  background: var(--accent-soft);
  border: 2px solid var(--border);
  display: grid;
  place-items: center;
  position: relative;
  transition: border-color 160ms ease;
}

/* Halo dirigido pela energia do áudio. Na Fase 3 o avatar vira sprites de
   viseme, mas o nível continua governando a intensidade. */
.avatar::after {
  content: '';
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 2px solid var(--accent);
  opacity: calc(var(--level) * 0.85);
  transform: scale(calc(1 + var(--level) * 0.14));
  transition: opacity 90ms linear, transform 90ms linear;
  pointer-events: none;
}

.avatar__mouth {
  width: 44px;
  height: calc(6px + var(--level) * 34px);
  background: var(--accent);
  border-radius: 999px;
  transition: height 70ms linear;
}

[data-mode='idle'] .avatar__mouth {
  height: 6px;
  background: var(--muted);
}

[data-mode='hearing'] .avatar {
  border-color: var(--accent);
}

.status {
  font-size: 13.5px;
  color: var(--muted);
  min-height: 1.4em;
}

[data-mode='speaking'] .status,
[data-mode='hearing'] .status {
  color: var(--accent);
}

/* Barra de nível do microfone */
.mic-meter {
  width: 180px;
  height: 4px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}

.mic-meter__fill {
  height: 100%;
  width: calc(var(--mic-level) * 100%);
  background: var(--accent);
  transition: width 70ms linear;
}

/* ─── Botão ─────────────────────────────────────────────────── */

button {
  font: inherit;
  font-weight: 550;
  padding: 10px 26px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--bg);
  cursor: pointer;
  transition: opacity 140ms ease;
}

button:hover:not(:disabled) {
  opacity: 0.88;
}

button:disabled {
  opacity: 0.5;
  cursor: progress;
}

/* ─── Token ─────────────────────────────────────────────────── */

.token-form {
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.token-form label {
  font-size: 12.5px;
  color: var(--muted);
}

.token-form__row {
  display: flex;
  gap: 8px;
}

.token-form input {
  flex: 1;
  min-width: 0;
  font: inherit;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.token-form input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.token-form small {
  font-size: 12px;
  color: var(--muted);
}

#tokenHint {
  color: var(--danger);
}

#tokenHint:empty {
  display: none;
}

/* ─── Legendas ──────────────────────────────────────────────── */

.captions {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 6px 18px;
  max-height: 260px;
  overflow-y: auto;
}

.captions:empty::after {
  content: 'A conversa aparece aqui.';
  display: block;
  padding: 16px 0;
  color: var(--muted);
  font-size: 13.5px;
}

.caption {
  margin: 12px 0;
  font-size: 14.5px;
}

.caption__who {
  display: inline-block;
  min-width: 52px;
  margin-right: 10px;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.caption--avatar .caption__who {
  color: var(--accent);
}

.caption--interim {
  color: var(--muted);
  font-style: italic;
}

/* ─── Métricas ──────────────────────────────────────────────── */

.metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.metric {
  flex: 1 1 180px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 15px;
}

.metric__label {
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.metric__value {
  margin-top: 3px;
  font-size: 14.5px;
  font-variant-numeric: tabular-nums;
}

/* ─── Erro ──────────────────────────────────────────────────── */

.error {
  background: var(--danger-soft);
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: 12px;
  padding: 12px 15px;
  font-size: 13.5px;
}

.note {
  font-size: 12.5px;
  color: var(--muted);
  text-align: center;
}

[hidden] {
  display: none !important;
}