:root {
  color-scheme: light;
  --bg: #f1f5f9;
  --bg-panel: rgba(255, 255, 255, 0.92);
  --bg-panel-alt: rgba(241, 245, 249, 0.8);
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --border: rgba(148, 163, 184, 0.35);
  --border-strong: rgba(100, 116, 139, 0.55);
  --shadow: rgba(15, 23, 42, 0.12);
  --radius: 18px;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(135deg, #ffffff, #e2e8f0, #f8fafc);
  color: var(--text);
  display: flex;
  justify-content: center;
  padding: 24px;
}

.app {
  width: min(1080px, 100%);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.app-header {
  text-align: center;
  padding: 24px 16px 0;
}

.app-header h1 {
  margin: 0;
  font-size: clamp(2.2rem, 3vw + 1rem, 3rem);
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 8px 0 0;
  color: var(--text-muted);
  font-size: 1rem;
}

.app-main {
  display: grid;
  gap: 24px;
  grid-template-columns: minmax(0, 1fr);
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 24px 40px -32px var(--shadow);
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(16px);
}

.controls-panel {
  grid-column: 1 / -1;
}

.panel-header {
  padding: 20px 24px 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.panel-header h2 {
  flex: 1;
  margin: 0;
  font-size: 1.25rem;
}

.panel-body {
  padding: 20px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.hidden {
  display: none;
}

.primary {
  background: var(--accent);
  color: #f8fafc;
  font-weight: 600;
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.4rem;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

.primary:hover,
.primary:focus-visible {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.primary:disabled {
  background: rgba(148, 163, 184, 0.35);
  color: rgba(15, 23, 42, 0.6);
  cursor: not-allowed;
  transform: none;
}

.hint {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.925rem;
}

.empty-state {
  display: none;
  padding: 12px;
  text-align: center;
  border-radius: calc(var(--radius) - 8px);
  border: 1px dashed var(--border);
  color: rgba(100, 116, 139, 0.75);
  font-size: 0.95rem;
}

.empty-state.visible {
  display: block;
}

.track-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.track-card {
  display: grid;
  gap: 10px;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  background: rgba(255, 255, 255, 0.86);
  border-radius: calc(var(--radius) - 6px);
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: 0 10px 24px -24px var(--shadow);
  padding: 14px 16px;
}

.track-card:focus-within,
.track-card:hover,
.track-card.selected {
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: 0 16px 30px -24px rgba(37, 99, 235, 0.35);
}

.track-card.playing {
  border-color: var(--accent);
  box-shadow: 0 18px 36px -24px rgba(37, 99, 235, 0.45);
  background: linear-gradient(90deg, rgba(37, 99, 235, 0.18), rgba(37, 99, 235, 0.04));
}

.track-meta {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.track-name {
  margin: 0;
  border: none;
  background: transparent;
  -webkit-appearance: none;
  appearance: none;
  padding: 0;
  text-align: left;
  font-weight: 600;
  font-size: 1rem;
  font-family: inherit;
  color: inherit;
  cursor: pointer;
  display: inline-block;
  width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.track-name:focus-visible {
  outline: none;
}

.track-duration {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.track-actions {
  display: flex;
  gap: 8px;
}

.ghost-button {
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid rgba(148, 163, 184, 0.35);
  color: var(--text);
  border-radius: 999px;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 0.2s ease, border 0.2s ease, transform 0.2s ease;
}

.ghost-button:hover,
.ghost-button:focus-visible {
  background: rgba(37, 99, 235, 0.16);
  border-color: rgba(37, 99, 235, 0.45);
  transform: translateY(-1px);
}

.ghost-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.95rem;
}

.field span {
  color: var(--text-muted);
}

.field input,
.field select {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 12px;
  padding: 0.6rem 0.75rem;
  color: var(--text);
  font-size: 1rem;
  transition: border 0.2s ease, box-shadow 0.2s ease;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: rgba(37, 99, 235, 0.6);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.18);
}

.mode-config {
  display: none;
  gap: 16px;
  padding: 12px 14px;
  border-radius: calc(var(--radius) - 8px);
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.3);
}

.mode-config.visible {
  display: flex;
  flex-direction: column;
}

.mode-hint {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.4;
}

.progress-display {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  min-width: 0;
}

#currentTrackLabel {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

#currentTimeLabel,
.progress-labels span {
  font-variant-numeric: tabular-nums;
}

.progress-bar {
  position: relative;
  width: 100%;
  height: 12px;
  background: var(--bg-panel-alt);
  border: 1px solid rgba(148, 163, 184, 0.4);
  border-radius: 999px;
  overflow: hidden;
}

.progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, rgba(37, 99, 235, 0.85), rgba(59, 130, 246, 0.95));
  transition: width 0.12s ease-out;
  z-index: 1;
}

.progress-highlight {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background: rgba(37, 99, 235, 0.22);
  pointer-events: none;
  z-index: 0;
}

.progress-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.control-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.control-button {
  width: 64px;
  height: 64px;
  padding: 0;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.control-button .media-icon,
.control-button .circle-arrow {
  pointer-events: none;
}

.media-icon {
  width: 32px;
  height: 32px;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: inherit;
}

.media-icon-playpause {
  width: 34px;
  height: 34px;
}

.media-icon-playpause .icon-play,
.media-icon-playpause .icon-pause {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: opacity 0.15s ease;
}

.media-icon-playpause .icon-play {
  width: 0;
  height: 0;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
  border-left: 18px solid currentColor;
  opacity: 1;
}

.media-icon-playpause .icon-pause {
  display: flex;
  gap: 6px;
  align-items: center;
  justify-content: center;
  opacity: 0;
}

.media-icon-playpause .icon-pause span {
  width: 6px;
  height: 24px;
  background: currentColor;
  border-radius: 2px;
}

#playPauseButton[data-state="play"] .icon-play {
  opacity: 1;
}

#playPauseButton[data-state="play"] .icon-pause {
  opacity: 0;
}

#playPauseButton[data-state="pause"] .icon-play {
  opacity: 0;
}

#playPauseButton[data-state="pause"] .icon-pause {
  opacity: 1;
}

.media-icon-next,
.media-icon-prev,
.media-icon-stop {
  width: 32px;
  height: 32px;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.media-icon-next::before,
.media-icon-prev::before {
  content: "";
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 12px solid transparent;
  border-bottom: 12px solid transparent;
}

.media-icon-next::before {
  left: 4px;
  border-left: 18px solid currentColor;
}

.media-icon-prev::before {
  right: 4px;
  border-right: 18px solid currentColor;
}

.media-icon-next::after,
.media-icon-prev::after {
  content: "";
  position: absolute;
  width: 5px;
  height: 24px;
  background: currentColor;
  border-radius: 2px;
  top: 50%;
  transform: translateY(-50%);
}

.media-icon-next::after {
  right: 2px;
}

.media-icon-prev::after {
  left: 2px;
}

.media-icon-stop::before {
  content: "";
  width: 20px;
  height: 20px;
  border-radius: 4px;
  background: currentColor;
}

.circle-arrow {
  width: 44px;
  height: 44px;
  border: 2px solid currentColor;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  position: relative;
  font-size: 0.95rem;
  color: inherit;
}

.circle-arrow::after {
  content: "";
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
}

.circle-arrow[data-direction="forward"]::after {
  right: -9px;
  border-left: 10px solid currentColor;
}

.circle-arrow[data-direction="back"]::after {
  left: -9px;
  border-right: 10px solid currentColor;
}

.circle-arrow-value {
  pointer-events: none;
}

.status {
  margin-top: 18px;
  background: rgba(255, 255, 255, 0.86);
  border-radius: calc(var(--radius) - 8px);
  padding: 16px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.95rem;
}

#chunkStatus {
  color: var(--text-muted);
}

#nowPlaying {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.app-footer {
  margin-top: 32px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.app-footer-version {
  color: rgba(100, 116, 139, 0.9);
}

@media (max-width: 720px) {
  body {
    padding: 16px;
  }

  .panel-header {
    flex-wrap: wrap;
    gap: 16px;
  }

  .track-card {
    grid-template-columns: 1fr;
  }

  .track-actions {
    justify-content: flex-start;
  }
}

@media (min-width: 780px) {
  .app-main {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    align-items: start;
  }

  .controls-panel {
    grid-column: 1 / -1;
  }
}