:root {
  --bg: #1a1a2e;
  --surface: #16213e;
  --surface2: #0f3460;
  --accent: #e94560;
  --accent2: #f5a623;
  --green: #4caf50;
  --text: #eaeaea;
  --text-dim: #888;
  --nut: #c8a96e;
  --string: #d4c4a0;
  --fret: #aaa;
  --marker: #555;
}

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

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
}

h1 {
  font-size: 1.6rem;
  letter-spacing: 2px;
  color: var(--accent);
  margin-bottom: 4px;
  text-transform: uppercase;
}

.subtitle { color: var(--text-dim); font-size: 0.85rem; margin-bottom: 20px; }

/* Mode selector */
.mode-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.mode-tab {
  padding: 8px 20px;
  border-radius: 20px;
  border: 2px solid var(--surface2);
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}

.mode-tab.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(233, 69, 96, 0.1);
}

/* Quiz area */
.quiz-container {
  width: 100%;
  max-width: 900px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

/* Prompt */
.prompt-card {
  background: var(--surface);
  border-radius: 16px;
  padding: 20px 32px;
  text-align: center;
  border: 1px solid var(--surface2);
  width: 100%;
}

.prompt-label {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.prompt-text { font-size: 1.4rem; font-weight: 600; }
.prompt-note { font-size: 2.5rem; font-weight: 700; color: var(--accent2); }

/* Fretboard */
.fretboard-wrap {
  width: 100%;
  overflow-x: auto;
  padding: 12px 0;
}

svg.fretboard-svg {
  display: block;
  margin: 0 auto;
}

/* Answer buttons for mode 1 */
.note-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  margin-top: 4px;
}

.note-btn {
  min-width: 56px;
  height: 56px;
  padding: 0 10px;
  border-radius: 28px;
  border: 2px solid var(--surface2);
  background: var(--surface);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
}

.note-btn:hover { border-color: var(--accent); color: var(--accent); transform: scale(1.08); }
.note-btn.correct { background: var(--green); border-color: var(--green); color: #fff; }
.note-btn.wrong { background: var(--accent); border-color: var(--accent); color: #fff; }

/* Feedback */
.feedback {
  font-size: 1.2rem;
  font-weight: 600;
  height: 32px;
  transition: all 0.2s;
}

.feedback.correct { color: var(--green); }
.feedback.wrong { color: var(--accent); }

/* Next button */
.next-btn {
  padding: 12px 36px;
  border-radius: 24px;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 1px;
}

.next-btn:hover { background: #c73652; transform: scale(1.04); }
.next-btn:disabled { opacity: 0.3; cursor: default; transform: none; }

/* Submit / clear buttons for mode 2 */
.submit-btn {
  padding: 12px 36px;
  border-radius: 24px;
  border: 2px solid var(--accent2);
  background: transparent;
  color: var(--accent2);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 1px;
}

.submit-btn:hover { background: rgba(245, 166, 35, 0.15); }

.clear-btn {
  padding: 12px 36px;
  border-radius: 24px;
  border: 2px solid var(--text-dim);
  background: transparent;
  color: var(--text-dim);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 1px;
}

.clear-btn:hover { background: rgba(136, 136, 136, 0.1); }

/* Stats */
.stats {
  display: flex;
  gap: 24px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.stats span { color: var(--text); font-weight: 600; }

/* Keyboard hint */
.kbd-hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: -8px;
}

kbd {
  background: var(--surface2);
  border-radius: 4px;
  padding: 1px 5px;
  font-family: monospace;
}

/* Settings row */
.settings-row {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.settings-row label { display: flex; align-items: center; gap: 6px; cursor: pointer; }

.settings-row input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.settings-row select {
  background: var(--surface);
  border: 1px solid var(--surface2);
  color: var(--text);
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 0.85rem;
}

/* Stats screen */
.stats-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  width: 100%;
  padding: 8px 0 32px;
}

.stats-overview {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--surface2);
  border-radius: 16px;
  padding: 24px 36px;
  text-align: center;
  min-width: 120px;
}

.stat-value {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent2);
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  margin-top: 4px;
}

.stats-modes, .stats-notes {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--surface2);
  border-radius: 16px;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.stats-section-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.mode-stat-row {
  display: grid;
  grid-template-columns: 1fr auto 200px;
  align-items: center;
  gap: 16px;
  font-size: 0.9rem;
}

.mode-stat-label { color: var(--text); }
.mode-stat-nums  { color: var(--text-dim); font-variant-numeric: tabular-nums; white-space: nowrap; }

.acc-bar-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 10px;
  position: relative;
  background: var(--surface2);
  border-radius: 5px;
  overflow: visible;
}

.acc-bar {
  height: 100%;
  border-radius: 5px;
  transition: width 0.4s ease;
  min-width: 2px;
}

.acc-bar-wrap span {
  position: absolute;
  right: -40px;
  font-size: 0.8rem;
  color: var(--text-dim);
  white-space: nowrap;
}

/* Note table */
.note-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.note-table th {
  text-align: left;
  color: var(--text-dim);
  font-weight: 500;
  padding: 4px 8px 10px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.note-table td {
  padding: 7px 8px;
  border-top: 1px solid rgba(255,255,255,0.04);
  vertical-align: middle;
}

.note-table td:nth-child(2),
.note-table td:nth-child(3) {
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

.note-table .acc-bar-wrap {
  width: 160px;
  margin-right: 48px;
}

.note-cell {
  font-weight: 600;
  color: var(--accent2);
  min-width: 56px;
}

.stats-empty {
  color: var(--text-dim);
  font-size: 0.95rem;
  padding: 16px 0;
}

.reset-stats-btn {
  padding: 10px 28px;
  border-radius: 20px;
  border: 2px solid var(--text-dim);
  background: transparent;
  color: var(--text-dim);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
  letter-spacing: 1px;
}

.reset-stats-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}