:root {
  --bg: #0f0f13;
  --bg-surface: #1a1a24;
  --bg-hover: #24243a;
  --bg-active: #2d2d4a;
  --text: #e8e6f0;
  --text-muted: #8888a8;
  --accent: #7c6fff;
  --accent-dim: #5a4fd4;
  --tenor: #f59e0b;
  --lead: #3b82f6;
  --bari: #10b981;
  --bass: #ef4444;
  --lyric: #e8e6f0;
  --border: #2a2a3e;
  --radius: 8px;
  --sidebar-w: 320px;
}

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

html {
  background: var(--bg);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

.layout {
  display: flex;
  height: 100vh;
}

/* ── Sidebar ─────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 12px 16px 12px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.sidebar-header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  flex: 1;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-logo {
  width: 40px;
  height: 40px;
  border-radius: 4px;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 1.25rem;
  width: 36px;
  height: 36px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  line-height: 1;
}

.search-filter-panel {
  width: 100%;
  margin-top: 8px;
}

/* On desktop, panel is always visible and toggle is hidden */
.search-filter-panel[hidden] { display: none !important; }

.tag-number {
  color: var(--text-muted);
  font-size: 0.75rem;
  min-width: 2ch;
  text-align: right;
  margin-right: 6px;
  flex-shrink: 0;
}

#search {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.875rem;
  outline: none;
  transition: border-color 0.2s;
}

#search:focus {
  border-color: var(--accent);
}

.filters {
  margin-top: 8px;
}

.filters select {
  width: 100%;
  padding: 6px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.8rem;
  outline: none;
  cursor: pointer;
}

.tag-list {
  list-style: none;
  overflow-y: auto;
  flex: 1;
  padding: 8px 0;
}

.tag-list li {
  padding: 10px 16px 10px 12px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: all 0.15s;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.tag-list li:hover {
  background: var(--bg-hover);
}

.tag-list li.active {
  background: var(--bg-active);
  border-left-color: var(--accent);
}

.tag-list li .tag-name {
  font-size: 0.875rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  text-align: left;
}

.tag-list li .tag-key-pill {
  font-size: 0.7rem;
  padding: 2px 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-left: 8px;
}

.sidebar-footer {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  position: relative;
}

/* Version: only increment the patch number (last digit) automatically.
   Bumping minor or major (e.g. v0.2.0, v1.0.0) requires explicit request. */
.version-label {
  position: absolute;
  right: 30px;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0.5;
  font-size: 0.65rem;
}

/* ── Main Content ────────────────────── */
.content {
  flex: 1;
  overflow-y: auto;
  padding: 32px 40px;
}

[hidden] { display: none !important; }

.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 60vh;
  text-align: center;
}

.welcome h2 {
  font-size: 1.75rem;
  margin-bottom: 8px;
}

.welcome p {
  color: var(--text-muted);
  font-size: 1rem;
}

.muted { color: var(--text-muted); margin-top: 4px; font-size: 0.85rem; }

/* ── Tag View ────────────────────────── */
.tag-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  padding-bottom: 16px;
  margin-bottom: 12px;
}

.tag-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.tag-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 600;
}

.key-badge {
  background: var(--accent-dim);
  color: white;
}

.meta-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ── Phrases / Notation Grid ─────────── */
.phrases {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.phrase {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.chord-grid {
  padding: 4px 0;
}

.grid-row {
  display: grid;
  /* grid-template-columns set inline per stave */
}

.grid-cell {
  padding: 5px 6px;
  text-align: center;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 0.85rem;
  border-right: 1px solid var(--border);
  min-width: 0;
}

.grid-cell:last-child { border-right: none; }

.grid-cell.sustain {
  color: var(--text-muted);
  opacity: 0.5;
}

.grid-cell.silent {
  color: var(--text-muted);
  opacity: 0.15;
}

.tenor-row .grid-cell { color: var(--tenor); }
.lead-row .grid-cell { color: var(--lead); }
.bari-row .grid-cell { color: var(--bari); }
.bass-row .grid-cell { color: var(--bass); }
.lyric-row .grid-cell {
  color: var(--lyric);
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
}

.lyric-row {
  background: rgba(255,255,255,0.03);
}

/* ── Responsive ──────────────────────── */

/* Back button — hidden on desktop */
.back-btn {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--accent);
  font-size: 0.85rem;
  padding: 6px 14px;
  cursor: pointer;
  margin-bottom: 12px;
  -webkit-tap-highlight-color: transparent;
}

@media (max-width: 768px) {
  body {
    overscroll-behavior: none;
  }

  .layout { flex-direction: column; }

  .sidebar {
    width: 100%;
    min-width: 100%;
    height: 100vh;
    border-right: none;
    max-height: none;
  }

  .content {
    display: none;
    padding: 20px 16px;
    padding-bottom: calc(20px + env(safe-area-inset-bottom));
    height: 100vh;
    overflow-y: auto;
    overscroll-behavior-y: none;
  }

  /* When a tag is selected, swap views */
  .layout.tag-selected .sidebar { display: none; }
  .layout.tag-selected .content { display: block; }

  /* Show back button on mobile */
  .back-btn { display: inline-block; }

  .tag-header {
    padding-top: calc(4px + env(safe-area-inset-top, 0px));
    background: var(--bg);
  }

  /* Larger touch targets */
  .tag-list li {
    padding: 14px 16px 14px 12px;
    min-height: 48px;
  }

  #search {
    padding: 12px 14px;
    font-size: 1rem;
  }

  .filters select {
    padding: 10px 12px;
    font-size: 0.9rem;
  }

  .sidebar-header {
    padding-top: calc(12px + env(safe-area-inset-top));
  }

  .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .search-filter-panel { display: none !important; }
  .search-filter-panel.open { display: block !important; }

  /* Smaller grid cells on mobile */
  .grid-cell {
    padding: 5px 4px;
    font-size: 0.8rem;
  }
}