:root {
  color-scheme: dark;
  --sidebar-width: 330px;
  --bg: #0b0d11;
  --panel: rgba(12, 15, 21, 0.84);
  --panel-strong: rgba(10, 12, 17, 0.94);
  --text: #f5f7fa;
  --muted: #9aa3af;
  --line: rgba(255,255,255,0.10);
  --accent: #b85f24;
  --accent-hover: #d47732;
  --accent-soft: rgba(184, 95, 36, 0.16);
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; background: var(--bg); }
body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
}
button, select { font: inherit; }

.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
  overflow: hidden;
}

.sidebar {
  position: relative;
  z-index: 20;
  height: 100vh;
  padding: 28px 20px 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  background: #0b0d11;
  border-right: 1px solid var(--line);
}

.brand { padding: 0 8px 22px; }
.eyebrow {
  display: inline-block;
  margin-bottom: 7px;
  color: var(--accent);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.2em;
}
.brand h1, .track-header h2, .empty-state h2 { margin: 0; }
.brand h1 { font-size: 1.42rem; letter-spacing: -0.035em; }

.sort-controls {
  padding: 16px 8px 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.sort-controls label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.sort-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.sort-row select,
.sort-row button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #12151b;
  color: var(--text);
  padding: 9px 10px;
}
.sort-row button { min-width: 62px; cursor: pointer; }
.sort-row button:hover { background: var(--accent-soft); border-color: rgba(184,95,36,.45); }
.sort-row select:focus,
.sort-row button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.track-list {
  min-height: 0;
  margin-top: 8px;
  overflow-y: auto;
  scrollbar-width: thin;
}

.track-item {
  width: 100%;
  padding: 14px 12px;
  border: 0;
  border-bottom: 1px solid rgba(255,255,255,0.055);
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
  transition: background 150ms ease, transform 150ms ease;
}
.track-item:hover { background: rgba(255,255,255,0.045); }
.track-item.active {
  background: var(--accent-soft);
  box-shadow: inset 3px 0 0 var(--accent);
}
.track-item.active .track-item-title { color: #ffc08e; }
.track-item-title {
  display: block;
  font-weight: 650;
  line-height: 1.25;
}
.track-item-meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 5px;
  color: var(--muted);
  font-size: 0.78rem;
}

.load-error {
  margin: 14px 8px;
  padding: 12px;
  border: 1px solid rgba(255,120,120,.3);
  border-radius: 8px;
  background: rgba(120,20,20,.15);
  color: #ffb5b5;
  font-size: .82rem;
}

.stage {
  position: relative;
  height: 100vh;
  overflow: hidden;
  background: #11151b;
}
.background-layer,
.stage-overlay {
  position: absolute;
  inset: 0;
}
.background-layer {
  background-position: center;
  background-size: cover;
  opacity: 0;
  transform: scale(1.02);
  transition: opacity 650ms ease, transform 1200ms ease;
}
.background-layer.active { opacity: 1; transform: scale(1); }
.stage-overlay {
  z-index: 2;
  background:
    linear-gradient(90deg, rgba(8,10,14,.82) 0%, rgba(8,10,14,.48) 34%, rgba(8,10,14,.28) 100%),
    linear-gradient(0deg, rgba(8,10,14,.72), rgba(8,10,14,.12) 55%, rgba(8,10,14,.34));
  pointer-events: none;
}

.empty-state {
  position: absolute;
  z-index: 4;
  left: 9%;
  top: 50%;
  max-width: 460px;
  transform: translateY(-50%);
  transition: opacity 220ms ease;
}
.empty-state.hidden { opacity: 0; pointer-events: none; }
.empty-state h2 { font-size: clamp(2.5rem, 6vw, 5.5rem); letter-spacing: -0.055em; }
.empty-state p { max-width: 410px; color: var(--muted); line-height: 1.65; }

.track-detail {
  position: absolute;
  z-index: 5;
  inset: 0;
  display: flex;
  align-items: center;
  padding: clamp(32px, 6vw, 90px);
  transform: translateX(100%);
  opacity: 0;
  transition: transform 520ms cubic-bezier(.2,.8,.2,1), opacity 280ms ease;
  pointer-events: none;
}
.track-detail.visible {
  transform: translateX(0);
  opacity: 1;
  pointer-events: auto;
}
.track-detail.switching .track-card { opacity: 0; transform: translateY(8px); }

.track-card {
  width: min(760px, 88%);
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  padding: clamp(26px, 4vw, 48px);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: 0 30px 90px rgba(0,0,0,.35);
  backdrop-filter: blur(18px);
  opacity: 1;
  transform: translateY(0);
  transition: opacity 160ms ease, transform 160ms ease;
}
.track-header h2 {
  margin-top: 1px;
  font-size: clamp(2.4rem, 6vw, 5.8rem);
  line-height: .95;
  letter-spacing: -0.055em;
}
.metadata-line {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 15px;
  color: #d7dce3;
}
.separator { color: #67707c; }

.player-section { margin-top: 44px; }
.waveform {
  display: block;
  width: 100%;
  height: 96px;
  margin-bottom: 14px;
  border-radius: 10px;
  background: rgba(255,255,255,.025);
  cursor: pointer;
}
audio { width: 100%; }
.no-audio {
  margin-top: 38px;
  padding: 15px 17px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--muted);
  background: rgba(255,255,255,.035);
}
.description {
  margin: 34px 0 0;
  max-width: 690px;
  color: #d8dde4;
  font-size: 1rem;
  line-height: 1.75;
  white-space: pre-line;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}
.action-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 15px;
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 9px;
  background: rgba(255,255,255,.075);
  color: var(--text);
  text-decoration: none;
  transition: background 150ms ease, transform 150ms ease;
}
.action-link:hover { background: rgba(255,255,255,.13); transform: translateY(-1px); }
.action-link.primary { background: var(--accent); color: #fff7ef; border-color: var(--accent); }
.action-link.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.site-footer {
  position: absolute;
  z-index: 6;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: rgba(255,255,255,.48);
  font-size: .68rem;
  letter-spacing: .02em;
  text-align: center;
}
.site-footer a {
  color: var(--accent);
  text-decoration: none;
}
.site-footer a:hover { color: var(--accent-hover); text-decoration: underline; }

@media (max-width: 760px) {
  :root { --sidebar-width: 150px; }
  .sidebar { padding: 18px 10px 10px; }
  .brand { padding: 0 4px 14px; }
  .brand h1 { font-size: 1rem; }
  .sort-controls { padding: 12px 4px; }
  .sort-row { grid-template-columns: 1fr; }
  .sort-row button { min-width: 0; }
  .track-item { padding: 12px 7px; }
  .track-item-meta { display: block; }
  .track-detail { padding: 20px; align-items: flex-end; }
  .track-card { width: 100%; max-height: 88vh; padding: 24px; border-radius: 16px; }
  .track-header h2 { font-size: clamp(2rem, 10vw, 4rem); }
  .site-footer { bottom: 8px; font-size: .62rem; }
}