/* ============================================
   Instrument Lessons
   Index, overview, lesson, widgets.
   ============================================ */

/* ---------- Index page: instrument cards ---------- */

.instrument-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

.instrument-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  text-decoration: none;
  color: var(--text-primary);
  transition: border-color 120ms ease, transform 120ms ease, box-shadow 120ms ease;
}

.instrument-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}

.instrument-card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-primary);
  border-radius: 12px;
  font-size: 24px;
  color: var(--color-primary-light);
  flex-shrink: 0;
}

.instrument-card-body {
  flex: 1;
  min-width: 0;
}

.instrument-card-body h2 {
  margin: 0 0 var(--space-1) 0;
  font-size: 1.25rem;
}

.instrument-card-body p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.instrument-card-progress {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.instrument-card .lesson-arrow {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.lessons-overview--secondary {
  margin-top: var(--space-6);
}

/* ---------- Instrument overview: module + lesson list ---------- */

.module-section {
  margin-top: var(--space-6);
}

.module-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.module-lessons {
  display: grid;
  gap: var(--space-3);
}

.module-lesson-card {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-4);
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text-primary);
  transition: border-color 120ms ease, background 120ms ease;
}

.module-lesson-card:hover {
  border-color: var(--color-primary);
  background: var(--bg-surface);
}

.module-lesson-card.lesson-completed {
  border-color: var(--color-success);
  background: var(--surface-success);
}

.module-lesson-status {
  width: 28px;
  text-align: center;
  flex-shrink: 0;
  font-size: 1.2rem;
  color: var(--text-secondary);
}

.module-lesson-card.lesson-completed .module-lesson-status {
  color: var(--color-success);
}

.module-lesson-card.lesson-auto:not(.lesson-completed) .module-lesson-status {
  color: var(--color-warning);
}

.module-lesson-body {
  flex: 1;
  min-width: 0;
}

.module-lesson-body h3 {
  margin: 0 0 4px 0;
  font-size: 1rem;
}

.module-lesson-body p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.auto-badge {
  display: inline-block;
  margin-top: var(--space-2);
  padding: 2px 8px;
  font-size: 0.7rem;
  background: var(--surface-warning);
  color: var(--color-warning);
  border-radius: 999px;
}

.module-lesson-card.lesson-completed .auto-badge {
  background: var(--surface-success);
  color: var(--color-success);
}

.instrument-summary-bar {
  margin-top: var(--space-3);
}

/* ---------- Lesson page ---------- */

.instrument-lesson-container {
  max-width: 880px;
}

.instrument-widget-section {
  margin-top: var(--space-6);
}

.widget-instruction {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.instrument-widget {
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: var(--space-4);
  overflow-x: auto;
}

.lesson-completion-row {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-start;
}

.btn-completed {
  background: var(--color-success) !important;
  border-color: var(--color-success) !important;
}

.btn-completed:hover {
  background: var(--color-success-dark) !important;
}

.lesson-auto-status {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.lesson-auto-status .fa-check-circle {
  color: var(--color-success);
  margin-right: var(--space-2);
}

.lesson-auto-status .fa-bolt {
  color: var(--color-warning);
  margin-right: var(--space-2);
}

.lesson-pager {
  margin-top: var(--space-5);
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
}

.lesson-pager-link {
  color: var(--color-primary-light);
  text-decoration: none;
  font-size: 0.95rem;
}

.lesson-pager-link:hover {
  color: var(--color-primary);
}

/* ---------- Piano widget ---------- */

.piano-widget {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.piano-keys {
  position: relative;
  height: 180px;
  display: flex;
}

.piano-key {
  display: block;
  border: 1px solid var(--border-color);
  cursor: pointer;
  background: var(--bg-surface);
  padding: 0;
  margin: 0;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.piano-key--white {
  width: 48px;
  height: 180px;
  background: #f7f7f7;
  border-right: 1px solid #ccc;
  border-radius: 0 0 6px 6px;
  z-index: 1;
}

.piano-key--white:last-child {
  border-right: 1px solid #999;
}

.piano-key--white:hover {
  background: #e8e8f0;
}

.piano-key--white.is-active {
  background: var(--color-primary-light);
}

.piano-key--black {
  position: absolute;
  top: 0;
  width: 30px;
  height: 110px;
  background: #1a1a1a;
  border: 1px solid #000;
  border-radius: 0 0 4px 4px;
  z-index: 2;
}

.piano-key--black:hover {
  background: #2a2a2a;
}

.piano-key--black.is-active {
  background: var(--color-primary);
}

.piano-range-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ---------- Fretboard (guitar + bass) ---------- */

.fretboard-wrap {
  display: inline-flex;
  flex-direction: column;
  gap: 0;
  background: linear-gradient(180deg, #2a1810, #1a0e07);
  border-radius: 6px;
  padding: var(--space-3);
  position: relative;
  min-width: 100%;
}

.fret-number-row,
.fret-string-row,
.fret-inlay-row {
  display: flex;
  align-items: center;
}

.fret-number {
  flex: 1;
  min-width: 36px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.75rem;
  padding: 4px 0;
}

.fret-cell {
  flex: 1;
  min-width: 36px;
  height: 32px;
  background: transparent;
  border: 0;
  border-right: 2px solid #5a3a1f;
  color: var(--text-primary);
  cursor: pointer;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

.fret-cell::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(180deg, #c9a17a, #8c6c4a);
  transform: translateY(-50%);
  z-index: 0;
  pointer-events: none;
}

.fret-cell:hover {
  background: rgba(255, 255, 255, 0.1);
}

.fret-cell.is-active {
  background: var(--color-primary);
}

.fret-open {
  border-right-width: 4px;
  border-right-color: #f0e0c0;
  background: rgba(0, 0, 0, 0.3);
  font-weight: 600;
}

.fret-inlay {
  flex: 1;
  min-width: 36px;
  height: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.inlay-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: rgba(255, 255, 255, 0.35);
  border-radius: 50%;
}

/* Bass: same look, slightly different palette to differentiate */
.fretboard-wrap--bass {
  background: linear-gradient(180deg, #1a1a2e, #0a0a18);
}

/* ---------- Drums widget ---------- */

.drums-widget {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
}

.drums-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-2);
  width: 100%;
}

.drum-pad {
  aspect-ratio: 1 / 1;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--text-primary);
  transition: background 80ms ease, border-color 80ms ease, transform 60ms ease;
}

.drum-pad:hover {
  border-color: var(--color-primary);
}

.drum-pad.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  transform: scale(0.97);
}

.drum-pad-key {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 700;
}

.drum-pad-label {
  font-size: 0.85rem;
}

.drum-pad.is-active .drum-pad-key,
.drum-pad.is-active .drum-pad-label {
  color: white;
}

.drums-hint {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.drums-hint kbd {
  padding: 2px 6px;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

/* ---------- Drum groove grid (in lesson HTML) ---------- */

.groove-grid {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-3) 0;
  font-size: 0.85rem;
}

.groove-grid th,
.groove-grid td {
  border: 1px solid var(--border-color);
  padding: 6px 4px;
  text-align: center;
}

.groove-grid thead th {
  background: var(--bg-surface);
  color: var(--text-secondary);
}

.groove-grid tbody th {
  text-align: left;
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-weight: 500;
}

.groove-grid td:not(:empty) {
  color: var(--color-primary-light);
  font-weight: 700;
  background: var(--surface-primary);
}

/* ---------- Mobile tweaks ---------- */

@media (max-width: 600px) {
  .piano-keys { transform: scale(0.85); transform-origin: left center; }
  .fret-cell, .fret-inlay, .fret-number { min-width: 28px; }
  .drums-grid { grid-template-columns: repeat(2, 1fr); }
}