/* Audio Player PWA - Styles */
:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f3460;
  --accent: #667eea;
  --accent-hover: #5a6fd6;
  --accent-light: rgba(102, 126, 234, 0.15);
  --text-primary: #eaeaea;
  --text-secondary: #a0a0b0;
  --text-muted: #6a6a8a;
  --border-color: #2a2a4a;
  --danger: #e53e3e;
  --danger-hover: #c53030;
  --success: #38a169;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.5);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg-primary: #f7f7fc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #edf0f7;
    --accent: #5a67d8;
    --accent-hover: #4c51bf;
    --accent-light: rgba(90, 103, 216, 0.12);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --text-muted: #8a8a9a;
    --border-color: #d0d0e0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.15);
  }
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: white;
  border-radius: var(--radius-sm);
  z-index: 10000;
  text-decoration: none;
  font-weight: 600;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.app-header h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), #a855f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Main */
.app-main {
  flex: 1;
  padding: 1.25rem;
  max-width: 640px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* Section */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.section-header h2 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
}

.section-actions {
  display: flex;
  gap: 0.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--border-color);
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger-hover);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: none;
  border-radius: var(--radius-full);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.icon-btn:hover:not(:disabled) {
  background: var(--accent-light);
  color: var(--accent);
}

.icon-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.icon-btn[aria-pressed="true"] {
  background: var(--accent-light);
  color: var(--accent);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1.5rem;
  text-align: center;
  background: var(--bg-secondary);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
}

.empty-icon {
  width: 64px;
  height: 64px;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.empty-state p {
  margin: 0 0 1rem;
  color: var(--text-secondary);
  font-size: 1rem;
}

/* Track List */
.track-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.track-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.track-item:hover {
  border-color: var(--accent);
  background: var(--accent-light);
}

.track-item:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.track-item.playing {
  border-color: var(--accent);
  background: var(--accent-light);
}

.track-item.playing .track-play-icon {
  display: none;
}

.track-item.playing .track-pause-icon {
  display: inline-flex;
}

.track-play-icon {
  display: inline-flex;
}

.track-pause-icon {
  display: none;
}

.track-artwork {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  overflow: hidden;
}

.track-artwork svg {
  width: 24px;
  height: 24px;
  color: var(--accent);
}

.track-info {
  flex: 1;
  min-width: 0;
}

.track-title {
  margin: 0 0 0.125rem;
  font-size: 0.9375rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-meta {
  margin: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-duration {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
}

.track-actions {
  display: flex;
  gap: 0.25rem;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.track-item:hover .track-actions,
.track-item:focus-within .track-actions {
  opacity: 1;
}

.track-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.track-action-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.track-action-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Player */
.player-section {
  margin-top: auto;
}

.player-card {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-lg);
}

.player-artwork {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  box-shadow: var(--shadow-md);
}

.music-note {
  width: 40px;
  height: 40px;
  color: var(--accent);
}

.player-info {
  text-align: center;
  margin-bottom: 1rem;
}

.player-title {
  margin: 0 0 0.25rem;
  font-size: 1.125rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player-artist {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.player-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.control-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  border-radius: var(--radius-full);
  background: var(--bg-primary);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.control-btn:hover:not(:disabled) {
  background: var(--accent);
  color: white;
  transform: scale(1.05);
}

.control-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.control-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.control-btn-main {
  width: 56px;
  height: 56px;
  background: var(--accent);
  color: white;
  box-shadow: var(--shadow-md);
}

.control-btn-main:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: scale(1.05);
}

.progress-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.time-display {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  min-width: 42px;
  text-align: center;
}

.progress-bar {
  flex: 1;
  height: 6px;
  background: var(--bg-primary);
  border-radius: var(--radius-full);
  cursor: pointer;
  position: relative;
  touch-action: none;
}

.progress-bar:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--accent);
  width: 0%;
  transition: width 0.1s linear;
}

.progress-handle {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0;
  transition: opacity var(--transition-fast);
  pointer-events: none;
  box-shadow: var(--shadow-sm);
}

.progress-bar:hover .progress-handle,
.progress-bar:focus-visible .progress-handle {
  opacity: 1;
}

.player-extras {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
}

.volume-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  position: relative;
}

.volume-control:hover .volume-slider,
.volume-control:focus-within .volume-slider {
  display: block;
}

.volume-slider {
  display: none;
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) rotate(-90deg);
  transform-origin: center;
  width: 80px;
  margin-bottom: 0.5rem;
  accent-color: var(--accent);
}

/* Footer */
.app-footer {
  padding: 1rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.75rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

/* Dialog */
.confirm-dialog {
  border: none;
  border-radius: var(--radius-lg);
  background: var(--bg-secondary);
  box-shadow: var(--shadow-lg);
  padding: 0;
  max-width: 90vw;
  width: 360px;
}

.confirm-dialog::backdrop {
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.confirm-dialog form {
  padding: 1.5rem;
}

.confirm-dialog h3 {
  margin: 0 0 0.75rem;
  font-size: 1.125rem;
}

.confirm-dialog p {
  margin: 0 0 1.5rem;
  color: var(--text-secondary);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 1000;
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  animation: slideUp 0.3s ease;
  pointer-events: auto;
  max-width: 90vw;
}

.toast.success {
  border-left: 4px solid var(--success);
}

.toast.error {
  border-left: 4px solid var(--danger);
}

.toast.info {
  border-left: 4px solid var(--accent);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(1rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Install button */
#install-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border: none;
  border-radius: var(--radius-full);
  background: var(--accent-light);
  color: var(--accent);
  cursor: pointer;
  transition: all var(--transition-fast);
}

#install-btn:hover {
  background: var(--accent);
  color: white;
}

#install-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Responsive */
@media (max-width: 480px) {
  .app-main {
    padding: 1rem;
  }

  .player-card {
    padding: 1.25rem;
  }

  .player-controls {
    gap: 1rem;
  }

  .control-btn-main {
    width: 48px;
    height: 48px;
  }

  .control-btn {
    width: 40px;
    height: 40px;
  }
}

/* Print */
@media print {
  .app-header, .player-section, .app-footer, .section-actions, .track-actions {
    display: none !important;
  }
}