:root {
  --bg-pitch-black: #000000;
  --surface-dark: #101216;
  --surface-elevated: #181B22;
  --surface-border: #282D37;
  
  --electric-cyan: #00E5FF;
  --neon-lime: #39FF14;
  --safety-amber: #FF9100;
  --alert-red: #FF1744;
  --youtube-red: #FF0000;

  --text-primary: #FFFFFF;
  --text-secondary: #B0B3B8;
  --text-muted: #6B7280;

  --btn-giant: 88px;
  --btn-large: 64px;
  --btn-medium: 52px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

body {
  background-color: var(--bg-pitch-black);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */
.app-header {
  height: 60px;
  background-color: var(--bg-pitch-black);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border-bottom: 1.5px solid var(--surface-border);
  flex-shrink: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 1px;
  color: var(--electric-cyan);
}

.brand-icon {
  width: 28px;
  height: 28px;
  fill: var(--electric-cyan);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  background: var(--surface-elevated);
  border: 1.5px solid var(--surface-border);
  border-radius: 12px;
  color: var(--text-primary);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

.icon-btn:active {
  transform: scale(0.92);
  border-color: var(--electric-cyan);
}

.icon-btn.active {
  border-color: var(--electric-cyan);
  color: var(--electric-cyan);
  background: rgba(0, 229, 255, 0.12);
}

/* Tab Content Container */
.tab-content-container {
  flex: 1;
  overflow-y: auto;
  position: relative;
  -webkit-overflow-scrolling: touch;
}

.tab-pane {
  display: none;
  min-height: 100%;
  padding-bottom: 24px;
}

.tab-pane.active {
  display: block;
}

/* Bottom Navigation */
.bottom-nav {
  height: 72px;
  background-color: var(--surface-dark);
  border-top: 2px solid var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 8px;
  flex-shrink: 0;
}

.nav-tab {
  flex: 1;
  height: 56px;
  background: transparent;
  border: none;
  border-radius: 14px;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.6px;
  cursor: pointer;
  transition: all 0.15s;
}

.nav-tab svg {
  width: 26px;
  height: 26px;
  fill: currentColor;
}

.nav-tab.active {
  color: var(--electric-cyan);
  background: rgba(0, 229, 255, 0.12);
  border: 1.5px solid var(--electric-cyan);
}

/* Player Screen */
.player-container {
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.quick-pills {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  width: 100%;
  overflow-x: auto;
  padding-bottom: 4px;
}

.pill-btn {
  background: var(--surface-elevated);
  border: 1.5px solid var(--surface-border);
  border-radius: 20px;
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  cursor: pointer;
}

.pill-btn.active {
  border-color: var(--safety-amber);
  color: var(--safety-amber);
  background: rgba(255, 145, 0, 0.15);
}

.visualizer-box {
  width: 220px;
  height: 220px;
  background: var(--surface-dark);
  border: 2.5px solid var(--surface-border);
  border-radius: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 12px 0 24px 0;
  transition: all 0.3s ease;
  position: relative;
}

.visualizer-box.playing {
  border-color: var(--electric-cyan);
  box-shadow: 0 0 35px rgba(0, 229, 255, 0.25);
}

.visualizer-icon {
  width: 80px;
  height: 80px;
  fill: var(--text-secondary);
  transition: fill 0.3s;
}

.visualizer-box.playing .visualizer-icon {
  fill: var(--neon-lime);
  animation: pulse 1.8s infinite ease-in-out;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

.track-info {
  text-align: center;
  margin-bottom: 20px;
  width: 100%;
  max-width: 480px;
}

.track-title {
  font-size: 24px;
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.25;
}

.track-artist {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.track-badges {
  display: flex;
  justify-content: center;
  gap: 8px;
}

.badge {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.8px;
  padding: 4px 10px;
  border-radius: 8px;
  background: var(--surface-border);
  color: var(--text-secondary);
}

.badge.neon {
  background: rgba(57, 255, 20, 0.15);
  color: var(--neon-lime);
  border: 1px solid var(--neon-lime);
}

.badge.cyan {
  background: rgba(0, 229, 255, 0.15);
  color: var(--electric-cyan);
  border: 1px solid var(--electric-cyan);
}

.badge.amber {
  background: rgba(255, 171, 0, 0.15);
  color: #ffab00;
  border: 1px solid #ffab00;
}

/* Scrubber / Progress Bar */
.progress-section {
  width: 100%;
  max-width: 500px;
  margin-bottom: 16px;
}

.scrubber-track {
  width: 100%;
  height: 8px;
  background: var(--surface-border);
  border-radius: 4px;
  position: relative;
  cursor: pointer;
  margin-bottom: 8px;
}

.scrubber-fill {
  height: 100%;
  background: var(--electric-cyan);
  border-radius: 4px;
  width: 0%;
  position: relative;
}

.scrubber-thumb {
  width: 20px;
  height: 20px;
  background: var(--electric-cyan);
  border-radius: 50%;
  position: absolute;
  right: -10px;
  top: -6px;
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.6);
}

.time-row {
  display: flex;
  justify-content: space-between;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
  padding: 0 4px;
}

/* Oversized Media Controls */
.media-controls {
  display: flex;
  align-items: center;
  justify-content: space-evenly;
  width: 100%;
  max-width: 480px;
  margin-bottom: 16px;
}

.btn-giant-play {
  width: var(--btn-giant);
  height: var(--btn-giant);
  border-radius: 50%;
  background: var(--electric-cyan);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 0 25px rgba(0, 229, 255, 0.35);
  transition: all 0.15s ease;
}

.btn-giant-play.playing {
  background: var(--neon-lime);
  box-shadow: 0 0 25px rgba(57, 255, 20, 0.35);
}

.btn-giant-play svg {
  width: 46px;
  height: 46px;
  fill: #000000;
}

.btn-giant-play:active {
  transform: scale(0.92);
}

.btn-secondary {
  width: var(--btn-large);
  height: var(--btn-large);
  border-radius: 50%;
  background: var(--surface-elevated);
  border: 2px solid var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn-secondary svg {
  width: 38px;
  height: 38px;
  fill: currentColor;
}

.btn-secondary:active {
  transform: scale(0.9);
  border-color: var(--electric-cyan);
}

.btn-aux {
  width: var(--btn-medium);
  height: var(--btn-medium);
  border-radius: 50%;
  background: var(--surface-elevated);
  border: 1.5px solid var(--surface-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
}

.btn-aux svg {
  width: 24px;
  height: 24px;
  fill: currentColor;
}

.btn-aux.active {
  border-color: var(--electric-cyan);
  color: var(--electric-cyan);
  background: rgba(0, 229, 255, 0.15);
}

.seek-quick-row {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.seek-btn {
  background: var(--surface-elevated);
  border: 1.5px solid var(--surface-border);
  border-radius: 24px;
  padding: 8px 20px;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.seek-btn:active {
  border-color: var(--electric-cyan);
}

/* Cards & Lists */
.card {
  background: var(--surface-dark);
  border: 1.5px solid var(--surface-border);
  border-radius: 18px;
  padding: 16px;
  margin-bottom: 14px;
  width: 100%;
}

.card.highlight {
  border-color: var(--electric-cyan);
}

.song-list-item {
  display: flex;
  align-items: center;
  padding: 14px 16px;
  background: var(--surface-dark);
  border: 1px solid var(--surface-border);
  border-radius: 16px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.song-list-item.active {
  border: 2px solid var(--electric-cyan);
  background: rgba(0, 229, 255, 0.1);
}

.song-list-item:active {
  transform: scale(0.98);
}

.song-art-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 14px;
  flex-shrink: 0;
}

.song-art-icon svg {
  width: 26px;
  height: 26px;
  fill: var(--text-primary);
}

.song-list-item.active .song-art-icon {
  background: var(--neon-lime);
}

.song-list-item.active .song-art-icon svg {
  fill: #000000;
}

.song-details {
  flex: 1;
  overflow: hidden;
}

.song-name {
  font-size: 16px;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.song-list-item.active .song-name {
  color: var(--electric-cyan);
}

.song-meta {
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  gap: 8px;
}

.download-badge {
  font-size: 10px;
  font-weight: 800;
  padding: 2px 6px;
  border-radius: 6px;
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal-overlay.open {
  display: flex;
}

.modal-sheet {
  background: var(--surface-dark);
  border: 2px solid var(--surface-border);
  border-radius: 24px;
  width: 100%;
  max-width: 460px;
  padding: 24px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.modal-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-primary {
  background: var(--electric-cyan);
  color: #000000;
  border: none;
  border-radius: 14px;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 10px;
}

.btn-primary:active {
  transform: scale(0.97);
}

.btn-secondary-action {
  background: var(--surface-elevated);
  color: var(--text-primary);
  border: 1.5px solid var(--surface-border);
  border-radius: 14px;
  padding: 12px 18px;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 8px;
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  background: var(--surface-elevated);
  border: 1.5px solid var(--surface-border);
  border-radius: 12px;
  padding: 14px;
  font-size: 16px;
  color: var(--text-primary);
  outline: none;
}

.form-input:focus {
  border-color: var(--electric-cyan);
}

/* YouTube Share Target Banner */
.youtube-share-banner {
  background: rgba(255, 0, 0, 0.12);
  border: 1.5px solid var(--youtube-red);
  border-radius: 16px;
  padding: 14px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.youtube-icon {
  width: 32px;
  height: 32px;
  fill: var(--youtube-red);
  flex-shrink: 0;
}

/* Fullscreen Drive Mode HUD */
#drive-hud {
  position: fixed;
  inset: 0;
  background: #000000;
  z-index: 999;
  display: none;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
}

#drive-hud.active {
  display: flex;
}