* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #0f1115;
  color: #f5f7fb;
}

#app {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px;
}

header h1 {
  margin: 0 0 8px;
  font-size: 1.75rem;
}

.subtitle {
  margin: 0 0 24px;
  color: #9aa4b2;
}

.panel {
  background: #1a1f29;
  border: 1px solid #2a3140;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 16px;
}

.panel label {
  display: block;
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.panel input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #3a4454;
  background: #0f1115;
  color: #f5f7fb;
  font-size: 0.95rem;
}

.hint {
  margin: 8px 0 0;
  color: #9aa4b2;
  font-size: 0.85rem;
}

#avatar-container {
  position: relative;
  background: #1a1f29;
  border: 1px solid #2a3140;
  border-radius: 16px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  margin-bottom: 20px;
}

#avatar-video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: #000;
}

#controls {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.volume-control {
  color: #9aa4b2;
  font-size: 0.9rem;
}

#volume-slider {
  width: 120px;
  accent-color: #3b82f6;
}

.audio-hint {
  margin: 12px 0 0;
  color: #9aa4b2;
  font-size: 0.85rem;
}

button {
  border: none;
  border-radius: 999px;
  padding: 12px 20px;
  font-size: 1rem;
  cursor: pointer;
  background: #3b82f6;
  color: white;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#btn-stop {
  background: #ef4444;
}

#status {
  margin-left: auto;
  color: #9aa4b2;
  font-size: 0.95rem;
  min-width: 120px;
}

.error-box {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  background: #3f1d1d;
  border: 1px solid #7f1d1d;
  color: #fecaca;
  white-space: pre-wrap;
  line-height: 1.5;
}

.error-box.hidden {
  display: none;
}