:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-2: #1c2431;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #2f81f7;
  --accent-hover: #4c94ff;
  --danger: #f85149;
  --success: #3fb950;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  background: var(--bg);
  background-image: radial-gradient(
      1000px 500px at 15% -10%,
      rgba(47, 129, 247, 0.12),
      transparent 60%
    ),
    radial-gradient(
      900px 500px at 100% 0%,
      rgba(63, 185, 80, 0.1),
      transparent 55%
    );
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.5;
  padding-bottom: 120px;
}

.site-header {
  text-align: center;
  padding: 2.5rem 1rem 1rem;
}

.site-header h1 {
  margin: 0;
  font-size: 2rem;
}

.tagline {
  color: var(--text-dim);
  margin: 0.5rem 0 0;
}

.container {
  max-width: 780px;
  margin: 0 auto;
  padding: 1rem;
}

.repo-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.field {
  margin-bottom: 1rem;
}

.field:last-child {
  margin-bottom: 0;
}

.field label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
}

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(47, 129, 247, 0.3);
}

.hint {
  display: block;
  color: var(--text-dim);
  margin-top: 0.35rem;
  font-size: 0.8rem;
}

.advanced {
  margin: 1rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  background: var(--surface-2);
}

.advanced summary {
  cursor: pointer;
  font-size: 0.9rem;
  color: var(--text-dim);
  user-select: none;
}

.advanced[open] summary {
  margin-bottom: 1rem;
}

.btn-primary {
  width: 100%;
  padding: 0.8rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

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

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.status {
  margin: 1.25rem 0;
  min-height: 1.2rem;
  text-align: center;
}

.status.error {
  color: var(--danger);
}

.status.loading {
  color: var(--text-dim);
}

.status.empty {
  color: var(--text-dim);
}

.results {
  margin-top: 1.5rem;
}

.results-header {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin-bottom: 0.75rem;
}

.results-header h2 {
  margin: 0;
  font-size: 1.2rem;
}

.count {
  color: var(--text-dim);
  font-size: 0.9rem;
}

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

/* 目录树 */
.tree-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* 嵌套层级缩进：文件夹内部内容向右缩进并加左边框 */
.tree-folder > details > .tree-list {
  margin-top: 0.5rem;
  margin-left: 0.6rem;
  padding-left: 0.9rem;
  border-left: 1px solid var(--border);
}

.folder-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
  user-select: none;
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.9rem;
  list-style: none;
}

.folder-row::-webkit-details-marker {
  display: none;
}

.folder-row::before {
  content: "▸";
  display: inline-block;
  transition: transform 0.15s;
  color: var(--text-dim);
}

details[open] > .folder-row::before {
  transform: rotate(90deg);
}

.folder-row:hover {
  background: var(--surface-2);
  color: var(--text);
}

.folder-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.folder-info {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.folder-desc {
  font-weight: 400;
  font-size: 0.75rem;
  color: var(--text-dim);
  opacity: 0.85;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.6rem 0.85rem;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.04),
    rgba(255, 255, 255, 0.01)
  );
  border: 1px solid var(--border);
  border-radius: 14px;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.18s ease, border-color 0.18s ease,
    box-shadow 0.18s ease, background 0.18s ease;
}

.track::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  transform: scaleY(0);
  transition: transform 0.18s ease;
}

.track:hover {
  transform: translateY(-2px);
  border-color: rgba(47, 129, 247, 0.5);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
  background: var(--surface-2);
}

.track.playing {
  border-color: transparent;
  background: linear-gradient(
    135deg,
    rgba(47, 129, 247, 0.18),
    rgba(63, 185, 80, 0.1)
  );
  box-shadow: 0 8px 28px rgba(47, 129, 247, 0.22);
}

.track.playing::before {
  transform: scaleY(1);
}

/* 渐变封面 + 音符 / 均衡器 */
.track-cover {
  position: relative;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12),
    0 2px 8px rgba(0, 0, 0, 0.3);
  overflow: hidden;
}

.cover-note {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  transition: opacity 0.15s;
}

/* 均衡器动画（仅播放时显示） */
.eq {
  position: absolute;
  inset: 0;
  display: none;
  align-items: flex-end;
  justify-content: center;
  gap: 3px;
  padding: 10px;
  background: rgba(0, 0, 0, 0.28);
}

.eq i {
  display: block;
  width: 3px;
  height: 40%;
  background: #fff;
  border-radius: 2px;
  animation: eq 0.9s ease-in-out infinite;
}

.eq i:nth-child(2) {
  animation-delay: 0.25s;
}
.eq i:nth-child(3) {
  animation-delay: 0.5s;
}
.eq i:nth-child(4) {
  animation-delay: 0.15s;
}

@keyframes eq {
  0%,
  100% {
    height: 25%;
  }
  50% {
    height: 90%;
  }
}

.track.playing .eq {
  display: flex;
}

/* 暂停时冻结均衡器动画，直观表示已暂停 */
.track.playing.paused .eq i {
  animation-play-state: paused;
  height: 30%;
  opacity: 0.7;
}

.track.playing .cover-note {
  opacity: 0;
}

.track-meta {
  min-width: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.track-name {
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track.playing .track-name {
  color: var(--accent-hover);
}

.track-sub {
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.track-size {
  flex-shrink: 0;
  font-size: 0.75rem;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

.track-action {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.7rem;
  color: var(--accent);
  background: rgba(47, 129, 247, 0.12);
  opacity: 0;
  transform: scale(0.8);
  transition: opacity 0.15s, transform 0.15s, background 0.15s;
}

.track:hover .track-action {
  opacity: 1;
  transform: scale(1);
}

.track.playing .track-action {
  opacity: 1;
  transform: scale(1);
  background: var(--accent);
  color: #fff;
}

.player-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  z-index: 10;
}

.player-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  flex: 0 1 240px;
}

.now-playing {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.9rem;
}

.player-bar audio {
  flex: 1;
  min-width: 0;
  height: 40px;
}

.site-footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  padding: 2rem 1rem;
}

@media (max-width: 600px) {
  .player-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .player-info {
    flex: none;
  }

  .player-bar audio {
    width: 100%;
  }

  body {
    padding-bottom: 160px;
  }
}