:root {
  --bg: #17191d;
  --panel: #1f2329;
  --panel-2: #262b32;
  --line: #333a43;
  --text: #d7dade;
  --text-dim: #8a919b;
  --accent: #e8a33d;      /* stage-light amber */
  --mute: #d15b5b;
  --solo: #e8d33d;
  --loop: #5a8cff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.4 -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
}

/* ---------- transport bar ---------- */

#transport {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 52px;
  padding: 0 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

#logo {
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--accent);
  margin-right: 8px;
  user-select: none;
}

.tbtn {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}
.tbtn:hover:not(:disabled) { border-color: var(--accent); }
.tbtn:disabled { opacity: 0.4; cursor: default; }
.tbtn.big { font-size: 17px; padding: 6px 18px; }
.tbtn.toggle.on { background: var(--accent); border-color: var(--accent); color: #17191d; font-weight: 600; }
#btn-loop.toggle.on { background: var(--loop); border-color: var(--loop); }

#speed-wrap { display: flex; align-items: center; gap: 6px; color: var(--text-dim); }
#speed { width: 110px; accent-color: var(--accent); }
#speed-val { min-width: 40px; font-variant-numeric: tabular-nums; }

#transpose-wrap { display: flex; align-items: center; gap: 2px; }
#transpose-wrap .step { padding: 6px 9px; font-weight: 700; }
#transpose-val {
  min-width: 34px;
  text-align: center;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  user-select: none;
}
#transpose-val.active { color: var(--accent); font-weight: 700; }

#soundfont {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 8px;
  font-size: 13px;
  max-width: 170px;
  cursor: pointer;
}
#soundfont:hover:not(:disabled),
#soundfont:focus { border-color: var(--accent); outline: none; }
#soundfont:disabled { opacity: 0.4; cursor: default; }

#position {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 160px;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}
#progress {
  flex: 1;
  height: 6px;
  background: var(--panel-2);
  border-radius: 3px;
  overflow: hidden;
  min-width: 60px;
}
#progress-fill { height: 100%; width: 0; background: var(--accent); }

#song-title {
  max-width: 26vw;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text-dim);
}

/* ---------- layout ---------- */

#main {
  display: flex;
  height: calc(100% - 52px);
}

#sidebar {
  width: 290px;
  min-width: 290px;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border-right: 1px solid var(--line);
}

#sidebar h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  padding: 10px 12px 6px;
}

#explorer { flex: 1 1 45%; min-height: 120px; display: flex; flex-direction: column; overflow: hidden; }
#trackrail { flex: 1 1 55%; border-top: 1px solid var(--line); display: flex; flex-direction: column; overflow: hidden; }

.hint { color: var(--text-dim); padding: 8px 12px; font-size: 13px; }

/* ---------- file explorer ---------- */

#library-controls { padding: 0 12px 8px; font-size: 12px; }
.import-actions { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
#library-source { background: var(--panel-2); color: var(--text); border: 1px solid var(--line); border-radius: 4px; padding: 4px; margin: 0 4px 6px; }
#btn-clear-library { font-size: 11px; padding: 4px 6px; }
.library-hint { color: var(--text-dim); font-size: 11px; margin-top: 3px; }
#import-help { margin: 0 0 10px; }
#import-help p + p { margin-top: 5px; }
#import-help code { font-size: inherit; }
#library-status { color: var(--accent); font-size: 11px; margin-top: 4px; }
#library-status:empty { display: none; }
#filelist .file { position: relative; }
#filelist .file:has(.remove-song) { padding-right: 32px; }
.remove-song { position: absolute; right: 8px; top: 4px; background: var(--panel-2); color: var(--text-dim); border: 1px solid var(--line); border-radius: 4px; width: 22px; height: 22px; cursor: pointer; }
.remove-song:hover:not(:disabled) { color: var(--mute); border-color: var(--mute); }
.remove-song:disabled { opacity: 0.4; cursor: default; }
#clear-library-dialog { margin: auto; max-width: min(440px, calc(100vw - 32px)); background: var(--panel); color: var(--text); border: 1px solid var(--line); border-radius: 10px; padding: 20px; }
#clear-library-dialog::backdrop { background: rgba(0, 0, 0, 0.65); }
#clear-library-dialog h2 { font-size: 18px; }
#clear-library-dialog p { margin: 12px 0; }

#breadcrumb {
  padding: 0 12px 6px;
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow-x: auto;
}
#breadcrumb a { color: var(--accent); cursor: pointer; text-decoration: none; }
#breadcrumb a:hover { text-decoration: underline; }

#filelist {
  list-style: none;
  overflow-y: auto;
  flex: 1;
}
#filelist li {
  padding: 5px 12px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#filelist li:hover { background: var(--panel-2); }
#filelist li.dir::before { content: "📁 "; }
#filelist li.file::before { content: "🎸 "; }
#filelist li.selected { background: var(--panel-2); color: var(--accent); }
#filelist li .size { color: var(--text-dim); font-size: 11px; margin-left: 6px; }

/* ---------- track rail ---------- */

#tracks { overflow-y: auto; flex: 1; }

.track-row {
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  grid-template-areas: "name eye mute solo" "vol vol vol vol";
  gap: 4px 6px;
  align-items: center;
  padding: 7px 12px 7px 9px;
  border-bottom: 1px solid var(--line);
  border-left: 3px solid transparent; /* tinted per track by conductor.js */
}

.track-row .chip {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 6px;
  vertical-align: baseline;
}
.track-row .tname {
  grid-area: name;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
}
.track-row .tname .perc { margin-left: 4px; }
.track-row.hidden-track .tname { color: var(--text-dim); text-decoration: line-through; }

.track-row button {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--text-dim);
  width: 26px;
  height: 22px;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
}
.track-row button:hover { border-color: var(--text-dim); }
.track-row .btn-eye  { grid-area: eye; }
.track-row .btn-mute { grid-area: mute; }
.track-row .btn-solo { grid-area: solo; }
.track-row .btn-mute.on { background: var(--mute); border-color: var(--mute); color: #fff; }
.track-row .btn-solo.on { background: var(--solo); border-color: var(--solo); color: #17191d; }

.track-row .vol {
  grid-area: vol;
  width: 100%;
  accent-color: var(--accent);
  height: 4px;
}

/* ---------- score viewport ---------- */

#stage {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

#viewport {
  flex: 1;
  min-height: 0;
  position: relative;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg);
}

#alphatab { padding: 10px 4px 60vh 4px; }

#overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(23, 25, 29, 0.85);
  z-index: 10;
}
#overlay.hidden { display: none; }
#overlay-msg {
  color: var(--text-dim);
  font-size: 16px;
  padding: 20px 30px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  max-width: 70%;
  text-align: center;
}

/* ---------- fretboard pane ---------- */

#fretpane {
  flex: 0 0 auto;
  background: var(--panel);
  border-top: 1px solid var(--line);
  padding: 4px 10px 8px;
}
#fret-head { display: flex; align-items: center; gap: 8px; margin-bottom: 2px; }
#fret-head h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-dim);
  margin-right: 4px;
}
#fret-head select {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 3px 6px;
  font-size: 12px;
}
#fretboard svg { display: block; width: 100%; height: auto; max-height: 26vh; }
#fretboard .fb-fretnum,
#fretboard .fb-label { fill: var(--text-dim); font-size: 12px; }
#fretboard .fb-note-label { fill: #17191d; font-size: 12px; font-weight: 700; }
#fretboard .fb-note-label.open { fill: var(--text); }
#fretboard .fb-note.next { opacity: 0.35; }
#fretboard .fb-note.bar circle { fill: rgba(23, 25, 29, 0.55); stroke-dasharray: 3 2; }
#fretboard .fb-note.bar .fb-note-label { fill: var(--text); opacity: 0.8; }
#fretboard .fb-hit { cursor: pointer; }
#fretboard .fb-hit:hover { fill: rgba(255, 255, 255, 0.08); }
.tbtn.small { padding: 3px 9px; font-size: 12px; }

/* alphaTab player chrome */
.at-cursor-bar { background: rgba(232, 163, 61, 0.12); }
.at-cursor-beat { background: rgba(232, 163, 61, 0.9); width: 3px; }
.at-selection div { background: rgba(90, 140, 255, 0.15); }
.at-highlight * { fill: var(--accent); stroke: var(--accent); }

/* slim scrollbars */
#btn-info { display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; padding: 5px 8px; }
#btn-info svg { display: block; flex-shrink: 0; }
#asset-info {
  margin: auto;
  width: min(600px, calc(100vw - 32px));
  max-height: calc(100vh - 48px);
  overflow-y: auto;
  padding: 22px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
}
#asset-info::backdrop { background: rgba(0, 0, 0, 0.65); }
.info-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 14px; }
#asset-info h2 { font-size: 18px; }
#asset-info p { margin: 12px 0; }
#asset-info a { color: var(--accent); }
.asset-credits { list-style: none; }
.asset-credits li { padding: 12px 0; border-bottom: 1px solid var(--line); }
#asset-info details { margin-top: 16px; }
#asset-info summary { cursor: pointer; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 5px; }
::-webkit-scrollbar-track { background: transparent; }