.md-grid {
  max-width: 100%;
}

/* ── Text-to-Speech bar ── */
#tts-bar {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--md-primary-fg-color);
  color: var(--md-primary-bg-color);
  padding: 0.45rem 0.75rem;
  border-radius: 2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
  font-size: 0.8rem;
}

#tts-bar button {
  background: transparent;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0.1rem 0.3rem;
  border-radius: 0.25rem;
  white-space: nowrap;
}

#tts-bar button:hover {
  background: rgba(255,255,255,0.2);
}

#tts-status {
  font-size: 0.75rem;
  opacity: 0.85;
}

/* ── TTS heading click-to-play hint ── */
.tts-play-hint {
  font-size: 0.6em;
  opacity: 0;
  color: var(--md-primary-fg-color);
  cursor: pointer;
  transition: opacity 0.2s;
  user-select: none;
  margin-left: 0.4em;
}

h1:hover .tts-play-hint,
h2:hover .tts-play-hint,
h3:hover .tts-play-hint,
h4:hover .tts-play-hint,
h5:hover .tts-play-hint,
h6:hover .tts-play-hint {
  opacity: 1;
}

/* ── TTS active section highlight ── */
.tts-active-section {
  background: rgba(255, 152, 0, 0.18);
  border-left: 3px solid var(--md-primary-fg-color);
  padding-left: 0.5rem;
  border-radius: 0.2rem;
  transition: background 0.3s ease;
}