:root {
  color-scheme: light;
  --bg: #f5f4fa;
  --card: rgba(255, 255, 255, 0.96);
  --border: rgba(124, 99, 186, 0.14);
  --text: #1e1a2e;
  --muted: #6e687f;
  --accent: #7457cf;
  --accent-soft: rgba(116, 87, 207, 0.12);
  --danger: #9c3951;
  --shadow: 0 22px 40px rgba(63, 47, 111, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  font-family:
    "IBM Plex Sans",
    "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
  background:
    radial-gradient(circle at top, rgba(138, 115, 221, 0.16), transparent 28%),
    linear-gradient(180deg, #faf9fd 0%, var(--bg) 100%);
  color: var(--text);
}

body {
  padding: 24px 16px;
}

button {
  font: inherit;
}

.app-shell {
  min-height: calc(100vh - 48px);
  display: grid;
  place-items: center;
}

.view {
  width: min(720px, 100%);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  padding: 28px;
}

.calibration-card {
  display: grid;
  gap: 16px;
}

.assistant-card {
  display: grid;
  gap: 18px;
  min-height: min(78vh, 760px);
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card-title {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 0.95;
}

.card-copy,
.timer-text,
.summary-text,
.transcript-empty,
.turn-header {
  color: var(--muted);
}

.card-copy,
.prompt-block,
.timer-text,
.summary-text {
  margin: 0;
  line-height: 1.5;
}

.prompt-block {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: var(--accent-soft);
  color: var(--text);
  font-weight: 600;
  white-space: pre-wrap;
}

.meter {
  height: 12px;
  border-radius: 999px;
  background: rgba(116, 87, 207, 0.12);
  overflow: hidden;
}

.meter-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(180deg, #8b71dd 0%, #6842c3 100%);
  transition: width 120ms linear;
}

.button-row {
  display: flex;
  justify-content: center;
}

.primary-button {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 14px 24px;
  min-width: 188px;
  background: linear-gradient(180deg, #8b71dd 0%, #6842c3 100%);
  color: white;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 14px 24px rgba(104, 66, 195, 0.24);
  transition:
    opacity 120ms ease,
    transform 120ms ease;
}

.primary-button:hover {
  transform: translateY(-1px);
}

.primary-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.transcript-log {
  min-height: 420px;
  max-height: 58vh;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.transcript-empty {
  min-height: 100%;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  background: rgba(116, 87, 207, 0.06);
}

.turn {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(116, 87, 207, 0.05);
  border: 1px solid rgba(124, 99, 186, 0.1);
}

.turn[data-role="assistant"] {
  background: rgba(116, 87, 207, 0.09);
}

.turn-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.turn-body {
  white-space: pre-wrap;
  line-height: 1.5;
}

.error-box {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(156, 57, 81, 0.08);
  border: 1px solid rgba(156, 57, 81, 0.16);
  color: var(--danger);
}

@media (max-width: 720px) {
  body {
    padding: 18px 12px;
  }

  .card {
    padding: 22px 18px;
  }

  .transcript-log {
    min-height: 360px;
  }

  .primary-button {
    width: 100%;
  }
}