:root {
  color-scheme: light;
  --bg: #0f1420;
  --panel: #171d2e;
  --panel-border: #232b40;
  --text: #eef1f8;
  --muted: #97a0b8;
  --accent: #4f7dff;
  --accent-hover: #6a91ff;
  --danger: #ff5c6a;
  --live: #2fd67c;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  background: radial-gradient(circle at 50% -10%, #1c2438 0%, var(--bg) 55%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 440px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 20px;
  padding: 32px 28px 28px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
}

.brand-mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(79, 125, 255, 0.18);
}

.brand-name {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

h1 {
  font-size: 21px;
  line-height: 1.4;
  margin: 0 0 8px;
  font-weight: 600;
}

.subtitle {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  margin: 0 0 28px;
}

.call-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 12px 0 22px;
}

.orb {
  width: 108px;
  height: 108px;
  border-radius: 50%;
  background: linear-gradient(160deg, #2a3350, #1a2032);
  border: 1px solid var(--panel-border);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.orb::after {
  content: "";
  position: absolute;
  inset: -10px;
  border-radius: 50%;
  border: 1px solid transparent;
  transition: border-color 0.25s ease;
}

.orb svg {
  width: 40px;
  height: 40px;
  color: var(--muted);
  transition: color 0.25s ease;
}

.card[data-state="connecting"] .orb {
  box-shadow: 0 0 0 6px rgba(79, 125, 255, 0.12);
}
.card[data-state="connecting"] .orb svg { color: var(--accent); }

.card[data-state="listening"] .orb,
.card[data-state="speaking"] .orb {
  box-shadow: 0 0 0 10px rgba(47, 214, 124, 0.14);
  transform: scale(1.03);
}
.card[data-state="listening"] .orb svg,
.card[data-state="speaking"] .orb svg { color: var(--live); }

.card[data-state="listening"] .orb {
  animation: pulse 1.6s ease-in-out infinite;
}
.card[data-state="speaking"] .orb {
  animation: pulse 0.9s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 8px rgba(47, 214, 124, 0.12); }
  50% { box-shadow: 0 0 0 16px rgba(47, 214, 124, 0.05); }
}

.status-line {
  font-size: 14px;
  color: var(--muted);
  min-height: 20px;
  text-align: center;
}

.status-line[data-tone="error"] { color: var(--danger); }
.status-line[data-tone="live"] { color: var(--live); }

.controls {
  display: flex;
  justify-content: center;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: 999px;
  padding: 13px 30px;
  font-size: 15px;
  font-weight: 600;
  transition: background 0.15s ease, transform 0.1s ease, opacity 0.15s ease;
}

button:active { transform: scale(0.98); }
button:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }

.btn-start {
  background: var(--accent);
  color: #fff;
}
.btn-start:hover:not(:disabled) { background: var(--accent-hover); }

.btn-end {
  display: none;
  background: rgba(255, 92, 106, 0.14);
  color: var(--danger);
  border: 1px solid rgba(255, 92, 106, 0.35);
}
.btn-end:hover:not(:disabled) { background: rgba(255, 92, 106, 0.22); }

.card[data-state="connecting"] .btn-start,
.card[data-state="listening"] .btn-start,
.card[data-state="speaking"] .btn-start {
  display: none;
}
.card[data-state="connecting"] .btn-end,
.card[data-state="listening"] .btn-end,
.card[data-state="speaking"] .btn-end {
  display: inline-block;
}

.card[data-state="mic-denied"] .controls,
.card[data-state="error"] .controls,
.card[data-state="no-agent"] .controls {
  display: none;
}

.retry {
  background: none;
  border: 1px solid var(--panel-border);
  color: var(--text);
  padding: 9px 20px;
  font-size: 13px;
  margin-top: 4px;
}

.disclosure {
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--panel-border);
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
  text-align: center;
}

.error-box {
  display: none;
  text-align: center;
  gap: 10px;
  flex-direction: column;
  align-items: center;
}

.card[data-state="mic-denied"] .error-box,
.card[data-state="error"] .error-box {
  display: flex;
}

.card[data-state="mic-denied"] .call-stage,
.card[data-state="error"] .call-stage,
.card[data-state="no-agent"] .call-stage {
  display: none;
}

.missing-agent {
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}