.soundboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
  max-width: 960px;
  margin: 0 auto;
  justify-content: center;
}

@media (min-width: 768px) {
  .soundboard-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
    max-width: 900px;
    margin: 0 auto;
  }
}

.sound-btn {
  position: relative;
  background: var(--grad-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.25rem 0.9rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  cursor: pointer;
  outline: none;
  transition: var(--transition-fast);
  text-align: center;
  overflow: hidden;
}

.sound-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(255, 85, 0, 0.25) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.sound-btn:hover::before {
  opacity: 1;
}

.sound-btn:hover {
  transform: translateY(-3px);
  border-color: var(--accent-flame-light);
  box-shadow: 0 8px 20px rgba(255, 85, 0, 0.25);
}

.sound-btn:active, .sound-btn.playing {
  transform: scale(0.96);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
}

.sound-emoji {
  font-size: 2rem;
  transition: transform 0.2s ease;
}

.sound-btn:hover .sound-emoji {
  transform: scale(1.15);
}

.sound-title {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
}

.sound-category {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sound-waves {
  display: flex;
  align-items: center;
  gap: 3px;
  height: 12px;
}

.wave-bar {
  width: 3px;
  height: 4px;
  background: var(--accent-cyan);
  border-radius: 2px;
  transition: height 0.15s ease;
}

.sound-btn.playing .wave-bar:nth-child(1) { animation: wavePulse 0.4s infinite alternate; }
.sound-btn.playing .wave-bar:nth-child(2) { animation: wavePulse 0.6s infinite alternate 0.1s; }
.sound-btn.playing .wave-bar:nth-child(3) { animation: wavePulse 0.5s infinite alternate 0.2s; }
.sound-btn.playing .wave-bar:nth-child(4) { animation: wavePulse 0.4s infinite alternate 0.15s; }

@keyframes wavePulse {
  0% { height: 4px; }
  100% { height: 14px; }
}

/* Stadium AdSense Billboard Banner */
.adsense-stadium-card {
  margin: 1.5rem auto 0 auto;
  max-width: 900px;
  background: rgba(10, 15, 28, 0.85);
  border: 1px dashed rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80px;
  text-align: center;
}

.ad-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

.ad-placeholder-box {
  width: 100%;
  max-width: 728px;
  height: 90px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  font-weight: 600;
}