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

:root {
  --bg:           #0d1117;
  --surface:      #161b22;
  --card:         #21262d;
  --border:       #30363d;
  --accent:       #c8963a;
  --text:         #c9d1d9;
  --text-dim:     #8b949e;
  --text-bright:  #f0f6fc;
  --bar:          #484f58;
  --correct-bg:   #0d2a52;
  --correct-bd:   #2d6ef5;
  --correct-tx:   #79c0ff;
  --partial-bg:   #2a1800;
  --partial-bd:   #8b5e3c;
  --partial-tx:   #d4a97a;
  --incorrect-bg: #2d1200;
  --incorrect-bd: #f97316;
  --incorrect-tx: #fed7aa;
  --radius:       6px;
}

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

#app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

/* ── Header ──────────────────────────────────────────────── */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0 1.25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.header-title {
  font-family: Georgia, serif;
  font-size: 1.4rem;
  color: var(--accent);
  letter-spacing: 0.06em;
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  padding: 0.45rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  font-size: 0.875rem;
  transition: border-color 0.12s, color 0.12s;
  white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #0d1117;
  font-weight: 600;
}
.btn-primary:hover { opacity: 0.88; color: #0d1117; }

.btn-danger { border-color: var(--incorrect-bd); }
.btn-danger:hover { color: var(--incorrect-tx); border-color: var(--incorrect-tx); }

/* ── List view ───────────────────────────────────────────── */
.list-actions {
  display: flex;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.standards-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.75rem;
}

.standard-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  cursor: pointer;
  transition: border-color 0.12s, transform 0.12s;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.standard-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.card-title    { font-size: 1rem; font-weight: 600; color: var(--text-bright); }
.card-composer { font-size: 0.8rem; color: var(--text-dim); }
.card-key      { font-size: 0.8rem; color: var(--accent); margin-top: 0.2rem; }
.card-meta     { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.3rem; flex-wrap: wrap; }

.card-badge {
  font-size: 0.7rem;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  font-weight: 600;
}
.card-badge.new  { background: #1a3a2a; color: #4caf7f; border: 1px solid #2d6a4f; }
.card-badge.done { background: var(--correct-bg); color: var(--correct-tx); border: 1px solid var(--correct-bd); }
.card-perf { font-size: 0.72rem; color: var(--text-dim); }

/* ── Detail header ───────────────────────────────────────── */
.detail-header { margin-bottom: 1.5rem; }

.detail-back {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.82rem;
  color: var(--text-dim);
  cursor: pointer;
  margin-bottom: 0.5rem;
  transition: color 0.12s;
}
.detail-back:hover { color: var(--accent); }

.detail-title {
  font-family: Georgia, serif;
  font-size: 1.7rem;
  color: var(--text-bright);
  line-height: 1.2;
}

.detail-sub {
  color: var(--text-dim);
  font-size: 0.875rem;
  margin-top: 0.2rem;
}
.detail-key { color: var(--accent); font-weight: 600; }

.detail-stats-bar {
  margin-top: 0.6rem;
  font-size: 0.82rem;
  color: var(--text-dim);
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.detail-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

/* ── Chord grid ──────────────────────────────────────────── */
.chord-grid {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.part-label {
  font-family: Georgia, serif;
  font-size: 0.78rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin: 0.9rem 0 0.3rem;
}

.grid-row {
  display: flex;
  align-items: stretch;
  border-left: 2px solid var(--bar);
}

.bar {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 4px 6px;
  border-right: 2px solid var(--bar);
}

/* Volta rows */
.volta-row {
  display: flex;
  align-items: stretch;
  border-left: 2px solid var(--bar);
}

.shared-bars {
  display: flex;
  align-items: stretch;
}

.volta-split {
  display: flex;
  flex-direction: column;
  border-right: 2px solid var(--bar);
}

.volta-ending {
  display: flex;
  align-items: center;
  flex: 1;
  padding: 2px 0;
}
.volta-ending:not(:last-child) { border-bottom: 1px dashed var(--bar); }

.volta-label {
  font-size: 0.68rem;
  color: var(--accent);
  font-style: italic;
  padding: 0 5px;
  min-width: 20px;
  flex-shrink: 0;
}

.volta-ending .bar { border-right: none; }
.volta-ending .bar:not(:last-child) { border-right: 2px solid var(--bar); }

/* ── Cells ───────────────────────────────────────────────── */
.cell {
  min-width: 72px;
  min-height: 52px;
  padding: 4px 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 600;
  border-radius: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
  transition: border-color 0.12s, background 0.12s, transform 0.08s;
  text-align: center;
  line-height: 1.2;
  color: var(--text-dim);
}
.cell:not(.correct):hover { border-color: var(--accent); transform: scale(1.03); }
.cell[draggable="true"] { cursor: grab; }
.cell[draggable="true"]:active { cursor: grabbing; }
.cell.dragging { opacity: 0.45; }
.cell.drag-over {
  border-color: var(--accent) !important;
  box-shadow: 0 0 0 2px var(--accent);
  transform: scale(1.05);
}
.cell:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.cell.correct {
  background: var(--correct-bg);
  border-color: var(--correct-bd);
  color: var(--correct-tx);
  cursor: default;
}
.cell.correct:hover { transform: none; border-color: var(--correct-bd); }

.cell.partial {
  background: var(--partial-bg);
  border-color: var(--partial-bd);
  border-width: 2px;
  color: var(--partial-tx);
}

.cell.incorrect {
  background: var(--incorrect-bg);
  border-color: var(--incorrect-bd);
  border-width: 2px;
  color: var(--incorrect-tx);
}

/* Completion grid flash */
@keyframes grid-complete {
  0%   { background: transparent; }
  20%  { background: rgba(45, 110, 245, 0.12); }
  50%  { background: rgba(200, 150, 58, 0.10); }
  80%  { background: rgba(45, 110, 245, 0.06); }
  100% { background: transparent; }
}
.chord-grid.completed { animation: grid-complete 1.6s ease-out; }

/* ── Completion banner ───────────────────────────────────── */
.completion-banner {
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: linear-gradient(135deg, #0d2a52 0%, #1a0d40 100%);
  border: 1px solid var(--correct-bd);
  border-radius: var(--radius);
  text-align: center;
}
.completion-banner h2 {
  font-family: Georgia, serif;
  color: var(--correct-tx);
  font-size: 1.3rem;
  margin-bottom: 0.4rem;
}
.completion-banner p {
  color: var(--text-dim);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}
.hints-notice { color: var(--incorrect-tx); font-size: 0.8rem; margin-bottom: 0.75rem; }
.completion-actions { display: flex; gap: 0.6rem; justify-content: center; }

/* ── Picker overlay ──────────────────────────────────────── */
.picker-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.72);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  backdrop-filter: blur(3px);
}

.picker-modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  width: min(440px, 94vw);
  max-height: 86vh;
  overflow-y: auto;
}

.picker-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}
.picker-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-bright);
}
.picker-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  padding: 0 0.2rem;
}
.picker-close:hover { color: var(--text-bright); }

.picker-section-label {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.4rem;
}
.picker-section-type { margin-top: 1rem; }
.picker-root-preview { color: var(--accent); font-weight: 700; font-size: 1rem; }

/* Note picker (step 1) */
.note-section { margin-bottom: 0.75rem; }
.note-group-label {
  font-size: 0.68rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.35rem;
}
.note-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}
.note-btn {
  padding: 0.5rem 0.7rem;
  min-width: 48px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 600;
  transition: border-color 0.1s, color 0.1s;
  text-align: center;
}
.note-btn:hover { border-color: var(--accent); color: var(--accent); }
.note-btn.selected {
  background: var(--accent);
  border-color: var(--accent);
  color: #0d1117;
}

/* Type picker (step 2) */
.type-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.35rem;
}
.type-btn {
  padding: 0.5rem 0.3rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--text);
  cursor: pointer;
  font-size: 0.8rem;
  transition: border-color 0.1s, color 0.1s;
  text-align: center;
  white-space: nowrap;
}
.type-btn:hover { border-color: var(--accent); color: var(--accent); }
.type-btn.selected {
  background: var(--accent);
  border-color: var(--accent);
  color: #0d1117;
}
.type-btn.inactive { opacity: 0.35; cursor: default; }
.type-btn.inactive:hover { border-color: var(--border); color: var(--text); }

/* ── Settings view ───────────────────────────────────────── */
.settings-section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.settings-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 1rem;
}
.settings-actions { display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: center; }

.stats-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.83rem;
}
.stats-table th {
  text-align: left;
  color: var(--text-dim);
  font-weight: 500;
  padding: 0.35rem 0.5rem;
  border-bottom: 1px solid var(--border);
}
.stats-table td {
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.stats-table tr:last-child td { border-bottom: none; }
.stat-num { text-align: right; color: var(--text-dim); }

/* ── About page ──────────────────────────────────────────── */
.about-page {
  max-width: 640px;
  margin-top: 1.5rem;
  line-height: 1.7;
}
.about-heading {
  font-family: Georgia, serif;
  font-size: 1.4rem;
  color: var(--text-bright);
  margin-bottom: 1rem;
}
.about-subheading {
  font-family: Georgia, serif;
  font-size: 1rem;
  color: var(--accent);
  margin: 1.4rem 0 0.4rem;
}
.about-page p {
  color: var(--text);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}
.about-swatch {
  display: inline-block;
  padding: 0.05rem 0.45rem;
  border-radius: 3px;
  font-weight: 600;
  font-size: 0.82rem;
}
.correct-swatch   { background: var(--correct-bg);   color: var(--correct-tx);   border: 1px solid var(--correct-bd); }
.partial-swatch   { background: var(--partial-bg);   color: var(--partial-tx);   border: 1px solid var(--partial-bd); }
.incorrect-swatch { background: var(--incorrect-bg); color: var(--incorrect-tx); border: 1px solid var(--incorrect-bd); }

/* ── Toast ───────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  z-index: 300;
  pointer-events: none;
  animation: toast-in 0.2s ease;
}
@keyframes toast-in { from { opacity: 0; transform: translateX(-50%) translateY(8px); } }
.toast-info { background: var(--card); border: 1px solid var(--border); color: var(--text); }
.toast-warn { background: #3a1a00; border: 1px solid #c87800; color: #ffcc80; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 600px) {
  .cell         { min-width: 58px; min-height: 44px; font-size: 0.7rem; }
  .type-grid    { grid-template-columns: repeat(3, 1fr); }
  .standards-list { grid-template-columns: 1fr; }
  .detail-title { font-size: 1.35rem; }
  .completion-actions { flex-direction: column; align-items: center; }
}