/* ===== Base ===== */
body {
  background-image:
    radial-gradient(ellipse at 50% 0%, rgba(139, 92, 246, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 20% 80%, rgba(59, 130, 246, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
}

/* ===== Group Section ===== */
.group-section {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.5s ease forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.group-section:nth-child(1) { animation-delay: 0.1s; }
.group-section:nth-child(2) { animation-delay: 0.2s; }
.group-section:nth-child(3) { animation-delay: 0.3s; }
.group-section:nth-child(4) { animation-delay: 0.4s; }

.group-title {
  font-family: 'Rubik', sans-serif;
  font-size: 1.25rem;
  font-weight: 600;
  color: #F8FAFC;
  margin-bottom: 1rem;
  padding-left: 0.25rem;
}

/* ===== Comparison Grid ===== */
.comparison-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

/* ===== Player Card ===== */
.player-card {
  background: rgba(26, 26, 62, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 1.25rem;
  transition: border-color 200ms ease, box-shadow 200ms ease;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.player-card:hover {
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.player-card.playing {
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 4px 32px rgba(0, 0, 0, 0.4);
}

.player-card.source.playing { border-color: rgba(59, 130, 246, 0.5); }
.player-card.reference.playing { border-color: rgba(139, 92, 246, 0.5); }
.player-card.converted.playing { border-color: rgba(249, 115, 22, 0.5); }

/* ===== Card Header ===== */
.card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card-badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 9999px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: 'Rubik', sans-serif;
  flex-shrink: 0;
  white-space: nowrap;
}

.card-badge.source {
  background: rgba(59, 130, 246, 0.15);
  color: #60A5FA;
}

.card-badge.reference {
  background: rgba(139, 92, 246, 0.15);
  color: #A78BFA;
}

.card-badge.converted {
  background: rgba(249, 115, 22, 0.15);
  color: #FB923C;
}

/* ===== Waveform ===== */
.waveform-container {
  position: relative;
  width: 100%;
  height: 80px;
  cursor: pointer;
  border-radius: 8px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.25);
  contain: layout style;
}

.waveform-container > div {
  width: 100% !important;
  height: 100% !important;
}

/* WaveSurfer waveform colors are set via JS — these are fallback overrides */
.waveform-container wave {
  overflow: hidden !important;
}

/* Loading state */
.waveform-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 80px;
  color: #64748B;
  font-size: 0.8rem;
}

.waveform-error {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 80px;
  color: #EF4444;
  font-size: 0.8rem;
  text-align: center;
  padding: 0 1rem;
}

/* ===== Controls ===== */
.controls-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.play-btn {
  flex-shrink: 0;
  width: 36px;
  min-width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 200ms ease, transform 150ms ease;
  background: rgba(255, 255, 255, 0.08);
  color: #F8FAFC;
}

.play-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: scale(1.05);
}

.play-btn:active {
  transform: scale(0.95);
}

.play-btn:focus-visible {
  outline: 2px solid #F97316;
  outline-offset: 2px;
}

.play-btn svg {
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.play-btn .pause-icon { display: none; }
.player-card.playing .play-btn .play-icon { display: none; }
.player-card.playing .play-btn .pause-icon { display: block; }

.time-display {
  font-size: 0.8rem;
  color: #94A3B8;
  font-variant-numeric: tabular-nums;
  width: 56px;
  text-align: right;
  flex-shrink: 0;
}

/* ===== Responsive ===== */
@media (max-width: 1023px) {
  .comparison-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
  }

  .player-card {
    padding: 1rem;
  }

  .waveform-container {
    height: 64px;
  }
}

@media (max-width: 767px) {
  .comparison-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .player-card {
    padding: 1rem;
  }

  .waveform-container {
    height: 72px;
  }

  .group-section {
    margin-bottom: 0;
  }

  header h1 {
    font-size: 2.5rem;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  .group-section {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .play-btn {
    transition: none;
  }

  .player-card {
    transition: none;
  }
}