@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a2e;
  --bg-card: #16162a;
  --bg-glass: rgba(22, 22, 42, 0.7);
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(255,255,255,0.12);
  --text-primary: #e8e8f0;
  --text-secondary: #8888a8;
  --text-muted: #5a5a78;
  --accent-1: #7c5cfc;
  --accent-2: #c850c0;
  --accent-3: #4fd1c5;
  --accent-4: #f093fb;
  --accent-glow: rgba(124,92,252,0.3);
  --stem-bass: #f97316;
  --stem-drums: #ef4444;
  --stem-guitar: #eab308;
  --stem-other: #8b5cf6;
  --stem-piano: #06b6d4;
  --stem-vocals: #ec4899;
  --stem-full: #7c5cfc;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 30px var(--accent-glow);
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
}

* { margin:0; padding:0; box-sizing:border-box; }
html { font-size:14px; scroll-behavior:smooth; }
body {
  font-family:'Inter',system-ui,sans-serif;
  background:var(--bg-primary);
  color:var(--text-primary);
  height:100vh;
  overflow:hidden;
}

::-webkit-scrollbar { width:6px; height:6px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:var(--bg-tertiary); border-radius:3px; }
::-webkit-scrollbar-thumb:hover { background:var(--accent-1); }

/* ─── Layout ─── */
.app { display:flex; flex-direction:column; height:100vh; overflow:hidden; }
.header {
  position:sticky; top:0; z-index:100;
  background:rgba(10,10,15,0.85);
  backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border);
  padding:0.75rem 1.5rem;
  display:flex; align-items:center; gap:1rem;
}
.header .logo {
  font-size:1.3rem; font-weight:800;
  background:linear-gradient(135deg,var(--accent-1),var(--accent-2));
  -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent;
  letter-spacing:-0.5px;
}
.header .logo span { font-weight:400; opacity:0.7; }

/* ─── Tabs ─── */
.tabs {
  display:flex; gap:0.25rem;
  background:var(--bg-secondary);
  border-radius:var(--radius);
  padding:3px; margin-left:auto;
}
.tab-btn {
  padding:0.45rem 1rem;
  border:none; border-radius:var(--radius-sm);
  background:transparent; color:var(--text-secondary);
  font-family:inherit; font-size:0.82rem; font-weight:500;
  cursor:pointer; transition:var(--transition);
  white-space:nowrap;
}
.tab-btn:hover { color:var(--text-primary); background:var(--bg-tertiary); }
.tab-btn.active {
  color:#fff;
  background:linear-gradient(135deg,var(--accent-1),var(--accent-2));
  box-shadow:0 2px 12px var(--accent-glow);
}

/* ─── Panels ─── */
.main { flex:1; padding:1rem 1.5rem 5rem; overflow-y:auto; overflow-x:hidden; min-height:0; }
.panel { display:none; animation:fadeIn 0.3s ease; will-change: opacity, transform; transform: translateZ(0); }
.panel.active { display:block; }
.panel.panel-fullscreen.active { display:flex; flex-direction:column; height:calc(100vh - 110px); }
@keyframes fadeIn { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:none} }

/* ─── Stem Selector ─── */
.stem-bar {
  display:flex; gap:0.5rem; flex-wrap:wrap;
  margin-bottom:1rem; align-items:center;
}
.stem-chip {
  padding:0.35rem 0.85rem;
  border:1px solid var(--border);
  border-radius:20px;
  background:var(--bg-secondary); color:var(--text-secondary);
  font-size:0.78rem; font-weight:500; cursor:pointer;
  transition:var(--transition); text-transform:capitalize;
}
.stem-chip:hover { border-color:var(--border-hover); color:var(--text-primary); }
.stem-chip.active { color:#fff; border-color:transparent; box-shadow:0 2px 10px rgba(0,0,0,0.3); }
.stem-chip:not([data-stem]).active { background:var(--accent-1); }
.stem-chip[data-stem="bass"].active { background:var(--stem-bass); }
.stem-chip[data-stem="drums"].active { background:var(--stem-drums); }
.stem-chip[data-stem="guitar"].active { background:var(--stem-guitar); }
.stem-chip[data-stem="other"].active { background:var(--stem-other); }
.stem-chip[data-stem="piano"].active { background:var(--stem-piano); }
.stem-chip[data-stem="vocals"].active { background:var(--stem-vocals); }
.stem-chip[data-stem="full"].active { background:var(--stem-full); }
.header-brand { display:flex; align-items:center; gap:1.5rem; }
.header-brand .logo { margin:0; }
.artist-selector {
  background:#222;
  color:#eee;
  border:1px solid #444;
  padding:0.4rem 0.8rem;
  border-radius:4px;
  font-size:0.9rem;
  outline:none;
}
.compare-player-slot { margin-top:0.4rem; }
.heatmap-stems-spaced { margin-bottom:0.5rem; }
.cluster-panel { position:relative; }
.cluster-graph-wrap { position:relative; }
.cluster-size-legend {
  position:absolute;
  right:12px;
  bottom:12px;
  z-index:3;
  pointer-events:none;
  max-width:220px;
  padding:0.55rem 0.7rem;
  border:1px solid rgba(255,255,255,0.08);
  border-radius:10px;
  background:rgba(10,12,20,0.72);
  backdrop-filter:blur(10px);
  box-shadow:0 8px 24px rgba(0,0,0,0.28);
}
.cluster-detail-empty-icon { font-size:1.5rem; margin-bottom:0.5rem; }
.cluster-detail-empty-text { font-size:0.7rem; color:var(--text-muted); }
.cluster-custom-panel {
  display:none;
  position:absolute;
  left:16px;
  top:58px;
  z-index:8;
  width:320px;
  padding:0.65rem 0.7rem;
  border:1px solid rgba(255,255,255,0.08);
  border-radius:10px;
  background:rgba(12,14,24,0.94);
  backdrop-filter:blur(12px);
  box-shadow:0 12px 28px rgba(0,0,0,0.32);
  overflow:hidden;
}

/* ─── Cards Grid ─── */
.song-grid {
  display:grid;
  grid-template-columns:repeat(4, 1fr);
  gap:0.75rem;
}
.song-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:1rem;
  cursor:pointer; transition:var(--transition);
  position:relative; overflow:hidden;
}
.song-card::before {
  content:''; position:absolute; top:0; left:0; right:0; height:3px;
  background:linear-gradient(90deg,var(--accent-1),var(--accent-2));
  opacity:0; transition:var(--transition);
}
.song-card:hover { border-color:var(--border-hover); transform:translateY(-2px); box-shadow:var(--shadow); }
.song-card:hover::before { opacity:1; }
.song-card.selected { border-color:var(--accent-1); box-shadow:var(--shadow-glow); }
.song-card.selected::before { opacity:1; }
.song-card .title { font-weight:600; font-size:0.95rem; margin-bottom:0.3rem; line-height:1.3; }
.song-card .meta { font-size:0.75rem; color:var(--text-secondary); }
.song-card .meta span { margin-right:0.6rem; }
.song-card .mood-badge {
  display:inline-block; margin-top:0.4rem;
  padding:0.15rem 0.5rem; border-radius:10px;
  background:rgba(124,92,252,0.15); color:var(--accent-1);
  font-size:0.7rem; font-weight:500;
}

/* ─── Stem Activity Indicators ─── */
.stem-dots {
  display:flex; gap:0.3rem; margin-top:0.4rem; align-items:center;
}
.stem-dot {
  width:8px; height:8px; border-radius:50%;
  border:1px solid rgba(255,255,255,0.1);
  position:relative;
}
.stem-dot.active { border:none; }
.stem-dot.silent { background:rgba(255,255,255,0.05); }
.stem-dot-label {
  font-size:0.6rem; color:var(--text-muted);
  margin-right:0.15rem;
}
.silent-tag {
  display:inline-flex; align-items:center; gap:0.2rem;
  padding:0.1rem 0.4rem; border-radius:4px;
  background:rgba(239,68,68,0.1); color:#ef4444;
  font-size:0.62rem; font-weight:500;
}

/* ─── Audio Player ─── */
.player-bar {
  position:fixed; bottom:0; left:0; right:0; z-index:200;
  background:rgba(10,10,15,0.95);
  backdrop-filter:blur(24px);
  border-top:1px solid var(--border);
  padding:0.5rem 1.5rem;
  display:flex; align-items:center; gap:1rem;
  transform:translateY(100%); transition:transform 0.4s ease;
}
.player-bar.visible { transform:none; }
.player-bar .now-playing { min-width:160px; }
.player-bar .now-playing .np-title { font-weight:600; font-size:0.82rem; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; max-width:180px; }
.player-bar .now-playing .np-stem { font-size:0.7rem; color:var(--text-secondary); text-transform:capitalize; }

/* ─── Waveform ─── */
.waveform-wrap {
  flex:1; min-width:0; max-width:500px;
  height:48px; position:relative;
  cursor:pointer;
  border-radius:var(--radius-sm);
  overflow:hidden;
  background:var(--bg-secondary);
}
.waveform-canvas {
  width:100%; height:100%;
  display:block;
}
.waveform-progress {
  position:absolute; top:0; left:0; bottom:0;
  background:rgba(124,92,252,0.12);
  pointer-events:none; transition:width 0.1s linear;
}
.waveform-time {
  position:absolute; bottom:2px; right:6px;
  font-family:'JetBrains Mono',monospace;
  font-size:0.65rem; color:var(--text-muted);
  pointer-events:none;
}

.player-controls {
  display:flex; align-items:center; gap:0.5rem;
}
.ctrl-btn {
  width:36px; height:36px; border:none; border-radius:50%;
  background:var(--accent-1); color:#fff;
  display:flex; align-items:center; justify-content:center;
  cursor:pointer; transition:var(--transition);
  font-size:1rem;
}
.ctrl-btn:hover { background:var(--accent-2); transform:scale(1.05); }

.player-stem-btns { display:flex; gap:0.3rem; flex-wrap:wrap; }
.player-stem-btn {
  padding:0.25rem 0.55rem; border:1px solid var(--border); border-radius:6px;
  background:transparent; color:var(--text-secondary);
  font-size:0.68rem; font-weight:500; cursor:pointer; transition:var(--transition);
  text-transform:capitalize; font-family:inherit;
}
.player-stem-btn:hover { border-color:var(--border-hover); color:var(--text-primary); }
.player-stem-btn.active { background:var(--accent-1); color:#fff; border-color:var(--accent-1); }
.player-stem-btn.silent-stem { opacity:0.35; text-decoration:line-through; }

/* ─── Analytics Panel ─── */
.analytics-header { margin-bottom: 1.5rem; }
.analytics-header h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: 0.5rem; }
.analytics-header .sub { font-size: 0.85rem; color: var(--text-secondary); max-width: 700px; line-height: 1.5; }
.analytics-chart-wrap { display: flex; flex-direction: column; gap: 1.5rem; }

/* Hero stat block */
.analytics-hero {
  background: var(--bg-card);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
}
.analytics-hero-inner { display: flex; justify-content: center; align-items: center; gap: 2rem; flex-wrap: wrap; margin-bottom: 1rem; }
.analytics-hero-stat { display: flex; flex-direction: column; align-items: center; gap: 0.4rem; }
.analytics-hero-number { font-size: 3rem; font-weight: 900; line-height: 1; font-family: 'JetBrains Mono', monospace; }
.analytics-hero-label { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.4; }
.analytics-hero-divider { font-size: 1.5rem; color: var(--border-hover); font-weight: 300; }
.analytics-hero-caption { font-size: 0.75rem; color: var(--text-muted); }

/* Section containers */
.analytics-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.analytics-section-header {
  padding: 1rem 1.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}
.analytics-section-header h3 { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.25rem; }
.analytics-section-header p { font-size: 0.78rem; color: var(--text-secondary); line-height: 1.4; }
.analytics-section-body { padding: 1.25rem 1.5rem; }
.analytics-note { font-size: 0.78rem; color: var(--text-secondary); line-height: 1.5; margin-bottom: 1rem; padding: 0.6rem 0.75rem; background: var(--bg-tertiary); border-radius: var(--radius-sm); border-left: 3px solid var(--accent-1); }
.analytics-footnote { font-size: 0.7rem; color: var(--text-muted); margin-top: 0.75rem; font-family: 'JetBrains Mono', monospace; }

/* Bar chart rows */
.a-bar-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; }
.a-bar-label { width: 70px; font-size: 0.8rem; font-weight: 600; text-transform: capitalize; flex-shrink: 0; }
.a-bar-track { flex: 1; height: 14px; background: var(--bg-tertiary); border-radius: 7px; overflow: hidden; position: relative; }
.a-bar-fill { height: 100%; border-radius: 7px; width: 0%; }
.a-bar-val { width: 90px; text-align: right; font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; font-weight: 600; flex-shrink: 0; }

/* Correlation table */
.a-corr-table { font-size: 0.82rem; }
.a-corr-header, .a-corr-row { display: grid; grid-template-columns: 80px repeat(4, 1fr); gap: 0.5rem; padding: 0.4rem 0; align-items: center; }
.a-corr-header { font-size: 0.7rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 1px solid var(--border); padding-bottom: 0.5rem; margin-bottom: 0.25rem; }
.a-corr-row { border-bottom: 1px solid rgba(255,255,255,0.03); }
.a-corr-row:last-child { border-bottom: none; }

/* Collinearity matrix */
.a-matrix-wrap { overflow-x: auto; margin: 0.5rem 0; }
.a-matrix { display: grid; gap: 2px; min-width: 400px; }
.a-matrix-cell { padding: 0.35rem 0.25rem; text-align: center; border-radius: 4px; font-size: 0.75em; }
.a-matrix-corner { background: transparent; }
.a-matrix-head { font-size: 0.72rem; font-weight: 600; text-transform: capitalize; background: var(--bg-secondary); padding: 0.4rem 0.2rem; }

/* Interpretation findings */
.analytics-interpretation .analytics-section-header { background: linear-gradient(135deg, rgba(124,92,252,0.08), rgba(200,80,192,0.05)); }
.analytics-finding { display: flex; gap: 1rem; margin-bottom: 1.25rem; padding-bottom: 1.25rem; border-bottom: 1px solid var(--border); line-height: 1.6; font-size: 0.83rem; }
.analytics-finding:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.analytics-finding-icon { width: 38px; height: 38px; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; flex-shrink: 0; }

/* ─── Similarity Panel ─── */
.sim-layout { display:grid; grid-template-columns:280px 1fr; gap:1rem; min-height:70vh; }
@media(max-width:900px) { .sim-layout { grid-template-columns:1fr; } }
.sim-sidebar {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:0.75rem;
  max-height:75vh; overflow-y:auto;
}
.sim-sidebar .search-box {
  width:100%; padding:0.5rem 0.75rem;
  border:1px solid var(--border); border-radius:var(--radius-sm);
  background:var(--bg-secondary); color:var(--text-primary);
  font-family:inherit; font-size:0.82rem;
  margin-bottom:0.5rem; outline:none;
}
.sim-sidebar .search-box:focus { border-color:var(--accent-1); }
.sim-song-item {
  display:flex; align-items:center; gap:0.5rem;
  padding:0.45rem 0.5rem; border-radius:var(--radius-sm);
  cursor:pointer; transition:var(--transition);
  border:1px solid transparent; font-size:0.8rem;
}
.sim-song-item:hover { background:var(--bg-tertiary); }
.sim-song-item.active { background:var(--bg-tertiary); border-color:var(--accent-1); }
.sim-song-item .idx { font-family:'JetBrains Mono'; font-size:0.68rem; color:var(--text-muted); min-width:1.4rem; }
.sim-song-item .name { font-weight:500; flex:1; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.sim-content { display:flex; flex-direction:column; gap:1rem; }

/* ─── Similarity Results ─── */
.sim-results-header {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:1rem;
}
.sim-results-header h2 { font-size:1.1rem; font-weight:700; margin-bottom:0.3rem; }
.sim-results-header .sub { font-size:0.8rem; color:var(--text-secondary); }

.sim-results-grid {
  display:grid; grid-template-columns:repeat(4, 1fr);
  gap:0.75rem;
}
.sim-result-card {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:1rem;
  transition:var(--transition); cursor:pointer;
}
.sim-result-card:hover { border-color:var(--border-hover); transform:translateY(-1px); }
.sim-result-card .rank { font-family:'JetBrains Mono'; font-size:0.72rem; color:var(--text-muted); }
.sim-result-card .res-title { font-weight:600; font-size:0.9rem; margin:0.2rem 0; }
.sim-result-card .res-meta { font-size:0.72rem; color:var(--text-secondary); margin-bottom:0.4rem; }

.sim-bar-container { display:flex; align-items:center; gap:0.5rem; margin-bottom:0.25rem; }
.sim-bar-label { font-size:0.68rem; color:var(--text-secondary); min-width:48px; text-transform:capitalize; }
.sim-bar-track { flex:1; height:5px; background:var(--bg-tertiary); border-radius:3px; overflow:hidden; }
.sim-bar-fill { height:100%; border-radius:3px; transition:width 0.5s ease; }
.sim-bar-value { font-family:'JetBrains Mono'; font-size:0.7rem; min-width:40px; text-align:right; font-weight:500; }

/* ─── Stem Contribution ─── */
.stem-contrib-section {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:1rem;
}
.stem-contrib-section h3 { font-size:0.9rem; font-weight:600; margin-bottom:0.75rem; }

/* ─── Heatmap ─── */
.heatmap-split {
  display:grid;
  grid-template-columns:1fr 420px;
  gap:1rem;
  height:calc(100vh - 160px);
}
@media(max-width:900px) { .heatmap-split { grid-template-columns:1fr; height:auto; } }
.heatmap-left {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:0.75rem;
  display:flex; align-items:flex-start; justify-content:flex-start;
  flex-direction:column;
  overflow:auto;
  min-height:0;
}
.heatmap-right {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:1rem;
  overflow-y:auto;
}
.heatmap-left > div {
  max-width:none;
}
.heatmap-detail-empty {
  display:flex; align-items:center; justify-content:center;
  height:100%; color:var(--text-muted);
  font-size:0.85rem; text-align:center; line-height:1.8;
}
.heatmap-right.locked { border-color:var(--accent-1); box-shadow:0 0 12px var(--accent-glow); }
.heatmap-detail-header { margin-bottom:0.75rem; }
.heatmap-detail-header h3 { font-size:0.92rem; font-weight:700; line-height:1.3; }
.heatmap-detail-header .sub { font-size:0.72rem; color:var(--text-secondary); }
.heatmap-detail-score {
  text-align:center; margin:0.75rem 0;
}
.heatmap-detail-score .big {
  font-size:2.2rem; font-weight:900;
  background:linear-gradient(135deg,var(--accent-1),var(--accent-2));
  background-clip:text;
  -webkit-background-clip:text; -webkit-text-fill-color:transparent;
}
.heatmap-detail-score .label { font-size:0.7rem; color:var(--text-secondary); }

/* ─── Cluster Panel ─── */
.cluster-toolbar {
  display:flex; align-items:center; gap:1rem; flex-wrap:wrap; margin-bottom:0.5rem;
}
.cluster-toolbar .stem-bar { margin-bottom:0; }
.cluster-slider-wrap {
  flex:1; display:flex; align-items:center; gap:0.5rem;
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:0.35rem 0.75rem;
  font-size:0.78rem; color:var(--text-secondary);
}
.cluster-slider-wrap input[type="range"] {
  flex:1; accent-color:var(--accent-1);
}
.cluster-slider-wrap span {
  font-family:'JetBrains Mono',monospace; font-weight:600;
  color:var(--text-primary); min-width:36px;
}
.cluster-actions { margin-left:auto; }
.cluster-split {
  display:grid; grid-template-columns:1fr 340px;
  gap:1rem; flex:1; min-height:0;
}
@media(max-width:900px) { .cluster-split { grid-template-columns:1fr; } }
.cluster-graph-wrap {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); position:relative; overflow:hidden;
}
.cluster-graph-wrap svg { width:100%; height:100%; display:block; }
.cluster-detail {
  background:var(--bg-card); border:1px solid var(--border);
  border-radius:var(--radius); padding:1rem; overflow-y:auto;
}
.cluster-detail-empty {
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  height:100%; color:var(--text-muted);
  font-size:0.85rem; text-align:center; line-height:1.8;
}
.cluster-detail.has-selection { border-color:var(--accent-1); box-shadow:0 0 12px var(--accent-glow); }
.cluster-legend {
  display:flex; flex-wrap:wrap; gap:0.5rem; margin-bottom:0.75rem;
}
.cluster-legend-item {
  display:flex; align-items:center; gap:0.3rem;
  font-size:0.7rem; color:var(--text-secondary);
}
.cluster-legend-dot {
  width:10px; height:10px; border-radius:50%;
}
.cluster-song-row {
  display:flex; align-items:center; gap:0.5rem;
  padding:0.4rem 0.5rem; border-radius:var(--radius-sm);
  border-bottom:1px solid var(--border); transition:var(--transition);
}
.cluster-song-row:hover { background:var(--bg-tertiary); }
.cluster-song-row .rank {
  font-family:'JetBrains Mono',monospace; font-size:0.68rem;
  color:var(--text-muted); min-width:1.4rem;
}
.cluster-song-row .name { flex:1; font-size:0.8rem; font-weight:500; }
.cluster-song-row .cluster-badge {
  padding:0.1rem 0.4rem; border-radius:8px;
  font-size:0.62rem; font-weight:600; color:#fff;
}
/* D3 brush */
.selection { fill:rgba(124,92,252,0.15); stroke:var(--accent-1); stroke-width:1.5; stroke-dasharray:4 2; }

/* ─── Compare Panel ─── */
.compare-controls-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:0.95rem;
}
.compare-controls-head h2 {
  font-size:1.02rem;
  font-weight:700;
  margin-bottom:0.2rem;
}
.compare-controls-head .sub {
  font-size:0.78rem;
  color:var(--text-secondary);
}
.compare-controls-row {
  display:grid;
  grid-template-columns:minmax(0,1fr) auto auto;
  gap:0.45rem;
  margin-top:0.75rem;
}
#compare-add-select {
  width:100%;
  background:var(--bg-secondary);
  color:var(--text-primary);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  padding:0.45rem 0.55rem;
  font-family:inherit;
  font-size:0.82rem;
}
#compare-add-select:disabled {
  opacity:0.45;
  cursor:not-allowed;
}
.compare-limit-note {
  margin-top:0.5rem;
  font-size:0.72rem;
  color:var(--text-secondary);
}
.compare-selected-list {
  margin-top:0.6rem;
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:0.55rem;
}
.compare-song-pill {
  background:var(--bg-secondary);
  border:1px solid var(--border);
  border-radius:10px;
  padding:0.5rem;
  display:flex;
  flex-direction:column;
  gap:0.4rem;
}
.compare-song-pill.in-focus {
  border-color:var(--accent-1);
  box-shadow:0 0 0 1px rgba(124,92,252,0.3);
}
.compare-song-pill-head {
  display:flex;
  align-items:center;
  gap:0.45rem;
}
.compare-song-pill-rank {
  width:1.35rem;
  height:1.35rem;
  border-radius:999px;
  display:flex;
  align-items:center;
  justify-content:center;
  background:rgba(124,92,252,0.18);
  color:#c7b8ff;
  font-family:'JetBrains Mono',monospace;
  font-size:0.66rem;
  font-weight:600;
}
.compare-song-pill-name {
  font-size:0.78rem;
  font-weight:600;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.compare-song-pill-actions {
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:0.35rem;
}
.compare-chip-remove {
  width:24px;
  height:24px;
  border:none;
  border-radius:6px;
  background:rgba(239,68,68,0.15);
  color:#fca5a5;
  cursor:pointer;
  font-size:0.74rem;
  transition:var(--transition);
}
.compare-chip-remove:hover { background:rgba(239,68,68,0.28); color:#fff; }
.compare-chip-remove:disabled {
  opacity:0.35;
  cursor:not-allowed;
}

.compare-summary-grid {
  margin:0.85rem 0;
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:0.65rem;
}
.compare-stat-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:10px;
  padding:0.75rem;
}
.compare-stat-label {
  font-size:0.68rem;
  color:var(--text-muted);
  text-transform:uppercase;
  letter-spacing:0.4px;
}
.compare-stat-value {
  margin-top:0.3rem;
  font-family:'JetBrains Mono',monospace;
  font-size:1.35rem;
  font-weight:800;
  line-height:1.15;
}
.compare-stat-sub {
  margin-top:0.4rem;
  font-size:0.72rem;
  color:var(--text-secondary);
  line-height:1.4;
}

.compare-matrix-layout {
  display:grid;
  grid-template-columns:1fr 360px;
  gap:0.9rem;
  align-items:start;
}
.compare-matrix-card,
.compare-pair-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:0.9rem;
}
.compare-matrix-head h3 {
  font-size:0.9rem;
  font-weight:700;
  margin-bottom:0.2rem;
}
.compare-matrix-head .sub {
  font-size:0.74rem;
  color:var(--text-secondary);
}
.compare-stem-bar {
  margin-top:0.55rem;
  display:flex;
  flex-wrap:wrap;
  gap:0.35rem;
}
.compare-stem-chip {
  border:1px solid var(--border);
  background:var(--bg-secondary);
  color:var(--text-secondary);
  border-radius:999px;
  padding:0.28rem 0.58rem;
  font-size:0.68rem;
  font-weight:600;
  text-transform:capitalize;
  cursor:pointer;
  transition:var(--transition);
}
.compare-stem-chip:hover {
  color:var(--text-primary);
  border-color:var(--border-hover);
}
.compare-stem-chip.active {
  color:#fff;
  border-color:transparent;
  box-shadow:0 2px 10px rgba(0,0,0,0.3);
}
.compare-stem-chip[data-stem="bass"].active { background:var(--stem-bass); }
.compare-stem-chip[data-stem="drums"].active { background:var(--stem-drums); }
.compare-stem-chip[data-stem="guitar"].active { background:var(--stem-guitar); }
.compare-stem-chip[data-stem="other"].active { background:var(--stem-other); }
.compare-stem-chip[data-stem="piano"].active { background:var(--stem-piano); }
.compare-stem-chip[data-stem="vocals"].active { background:var(--stem-vocals); }
.compare-stem-chip[data-stem="full"].active { background:var(--stem-full); }
.compare-matrix-scroll {
  margin-top:0.65rem;
  overflow:auto;
}
.compare-matrix-grid {
  display:grid;
  grid-template-columns:220px repeat(var(--compare-count), minmax(92px,1fr));
  gap:0.35rem;
  min-width:max-content;
}
.compare-matrix-cell {
  min-height:44px;
  border:1px solid var(--border);
  border-radius:8px;
  background:var(--bg-secondary);
  color:var(--text-primary);
  font-size:0.72rem;
  padding:0.35rem;
  display:flex;
  align-items:center;
  justify-content:center;
  text-align:center;
}
.compare-matrix-corner {
  background:transparent;
  border-style:dashed;
  color:var(--text-muted);
  font-weight:600;
}
.compare-matrix-head,
.compare-matrix-row {
  justify-content:flex-start;
  padding:0.45rem 0.5rem;
  font-weight:600;
  line-height:1.25;
}
.compare-matrix-head {
  background:rgba(124,92,252,0.1);
  border-color:rgba(124,92,252,0.24);
}
.compare-matrix-row {
  background:rgba(255,255,255,0.02);
  color:var(--text-secondary);
}
.compare-matrix-diag {
  color:var(--text-muted);
  font-family:'JetBrains Mono',monospace;
}
button.compare-matrix-value {
  cursor:pointer;
  font-family:'JetBrains Mono',monospace;
  font-size:0.78rem;
  font-weight:700;
  color:var(--sim-color);
  background:color-mix(in srgb, var(--sim-color) calc(var(--sim-alpha) * 100%), #0a0a0f);
  border:1px solid color-mix(in srgb, var(--sim-color) 38%, transparent);
  transition:var(--transition);
}
button.compare-matrix-value:hover {
  transform:translateY(-1px);
  filter:brightness(1.08);
}
button.compare-matrix-value.active {
  box-shadow:0 0 0 2px rgba(255,255,255,0.16), 0 0 0 4px rgba(124,92,252,0.2);
}

.compare-pair-head h3 {
  font-size:0.85rem;
  line-height:1.35;
}
.compare-pair-score {
  margin-top:0.35rem;
  font-family:'JetBrains Mono',monospace;
  font-size:2.2rem;
  font-weight:900;
  line-height:1;
}
.compare-pair-score-label {
  margin-top:0.15rem;
  font-size:0.7rem;
  color:var(--text-secondary);
}
.compare-pair-song-grid {
  margin-top:0.7rem;
  display:grid;
  grid-template-columns:1fr;
  gap:0.45rem;
}
.compare-pair-song {
  background:var(--bg-secondary);
  border:1px solid var(--border);
  border-radius:8px;
  padding:0.55rem;
}
.compare-pair-song-name {
  font-size:0.77rem;
  font-weight:700;
}
.compare-pair-song-meta {
  margin:0.2rem 0 0.45rem;
  font-size:0.68rem;
  color:var(--text-secondary);
}
.compare-pair-stems {
  margin-top:0.75rem;
  display:grid;
  gap:0.42rem;
}
.compare-pair-stem-row {
  display:grid;
  grid-template-columns:52px 1fr 48px;
  gap:0.4rem;
  align-items:center;
}
.compare-pair-stem-row.muted { opacity:0.35; }
.compare-pair-stem-name {
  font-size:0.68rem;
  font-weight:700;
  text-transform:capitalize;
}
.compare-pair-stem-track {
  height:8px;
  border-radius:999px;
  background:var(--bg-tertiary);
  overflow:hidden;
}
.compare-pair-stem-fill {
  height:100%;
  border-radius:999px;
}
.compare-pair-stem-val {
  font-family:'JetBrains Mono',monospace;
  font-size:0.68rem;
  font-weight:600;
  text-align:right;
}

.compare-empty-state {
  border:1px dashed var(--border-hover);
  border-radius:10px;
  padding:1rem;
  text-align:center;
  font-size:0.8rem;
  color:var(--text-muted);
}

@media(max-width:1100px) {
  .compare-summary-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
  .compare-matrix-layout { grid-template-columns:1fr; }
}
@media(max-width:700px) {
  .compare-controls-row { grid-template-columns:1fr; }
  .compare-summary-grid { grid-template-columns:1fr; }
  .compare-selected-list { grid-template-columns:1fr; }
  .compare-matrix-grid { grid-template-columns:160px repeat(var(--compare-count), minmax(86px,1fr)); }
}

/* ─── Popup Modal ─── */
.modal-overlay {
  position:fixed; inset:0; z-index:500;
  background:rgba(0,0,0,0.6);
  backdrop-filter:blur(6px);
  display:flex; align-items:center; justify-content:center;
  opacity:0; pointer-events:none;
  transition:opacity 0.25s ease;
  will-change: opacity;
}
.modal-overlay.open { opacity:1; pointer-events:auto; }
.modal {
  background:var(--bg-card);
  border:1px solid var(--border-hover);
  border-radius:var(--radius-lg);
  padding:1.5rem;
  max-width:560px; width:90%;
  max-height:85vh; overflow-y:auto;
  box-shadow:0 16px 64px rgba(0,0,0,0.6), 0 0 40px var(--accent-glow);
  transform:scale(0.92) translateY(12px) translateZ(0);
  transition:transform 0.3s ease;
  will-change: transform;
}
.modal-overlay.open .modal { transform:none; }
.modal-close {
  float:right; background:none; border:none;
  color:var(--text-muted); font-size:1.3rem;
  cursor:pointer; padding:0.2rem 0.5rem;
  border-radius:6px; transition:var(--transition);
}
.modal-close:hover { color:var(--text-primary); background:var(--bg-tertiary); }
.modal h2 { font-size:1.05rem; font-weight:700; margin-bottom:0.2rem; }
.modal .modal-sub { font-size:0.78rem; color:var(--text-secondary); margin-bottom:1rem; }
.modal-section { margin-top:1rem; }
.modal-section h4 { font-size:0.8rem; font-weight:600; color:var(--text-secondary); margin-bottom:0.5rem; text-transform:uppercase; letter-spacing:0.5px; }
.modal-actions { display:flex; gap:0.4rem; flex-wrap:wrap; margin-top:0.75rem; }
.modal-action-btn {
  padding:0.35rem 0.75rem;
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  background:var(--bg-secondary); color:var(--text-primary);
  font-family:inherit; font-size:0.78rem; font-weight:500;
  cursor:pointer; transition:var(--transition);
}
.modal-action-btn:hover { background:var(--accent-1); color:#fff; border-color:var(--accent-1); }
.modal-action-btn.primary {
  background:linear-gradient(135deg,var(--accent-1),var(--accent-2));
  color:#fff; border:none;
}
.modal-action-btn:disabled {
  opacity:0.45;
  cursor:not-allowed;
}
.modal-action-btn:disabled:hover {
  background:var(--bg-secondary);
  color:var(--text-primary);
  border-color:var(--border);
}

/* ─── Play Buttons ─── */
.play-btn {
  display:inline-flex; align-items:center; gap:0.3rem;
  padding:0.25rem 0.5rem; border:1px solid var(--border);
  border-radius:6px; background:transparent; color:var(--text-secondary);
  font-family:inherit; font-size:0.7rem; cursor:pointer; transition:var(--transition);
}
.play-btn:hover { background:var(--accent-1); color:#fff; border-color:var(--accent-1); }
.play-btn.silent-stem { opacity:0.3; text-decoration:line-through; }
.play-btn svg { width:10px; height:10px; }

/* ─── Loading ─── */
.loader {
  display:flex; align-items:center; justify-content:center;
  min-height:60vh; flex-direction:column; gap:1rem;
}
.loader .spinner {
  width:40px; height:40px; border:3px solid var(--bg-tertiary);
  border-top-color:var(--accent-1); border-radius:50%;
  animation:spin 0.8s linear infinite;
}
@keyframes spin { to{transform:rotate(360deg)} }
.loader p { color:var(--text-secondary); font-size:0.85rem; }
.section-title { font-size:1rem; font-weight:700; margin-bottom:0.75rem; }