/* Reset and Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #0f3460;
  --text-primary: #e8e8e8;
  --text-secondary: #a8a8b3;
  --accent: #e85d3a;
  --accent-hover: #ff7a5c;
  --root-color: #e85d3a;
  --scale-color: #4ecdc4;
  --chord-color: #ffe66d;
  --shared-color: #ff6b6b;
  --fret-color: #3a3a5c;
  --string-color: #5a5a7c;
  --border-radius: 8px;
  --transition: 0.2s ease;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.site-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
}

.main-nav {
  display: flex;
  gap: 1.5rem;
}

.main-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition);
}

.main-nav a:hover {
  color: var(--accent);
}

/* Hero */
.hero {
  padding: 3rem 0 2rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* Controls Section */
.controls-section {
  padding: 2rem 0;
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255,255,255,0.05);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.presets {
  margin-bottom: 2rem;
}

.presets h2 {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.preset-btn {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.1);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all var(--transition);
}

.preset-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.panel-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.panel-control h3 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--accent);
}

.control-row {
  margin-bottom: 0.75rem;
}

.control-row label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}

.control-row select {
  width: 100%;
  padding: 0.625rem;
  background: var(--bg-primary);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-size: 1rem;
  cursor: pointer;
}

.control-row select:focus {
  outline: none;
  border-color: var(--accent);
}

.global-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.toggle-group {
  display: flex;
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.toggle-btn {
  padding: 0.5rem 1rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all var(--transition);
}

.toggle-btn.active {
  background: var(--accent);
  color: white;
}

.toggle-btn:hover:not(.active) {
  color: var(--text-primary);
}

#chord-overlay {
  padding: 0.5rem;
  background: var(--bg-primary);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
}

.action-btn {
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.875rem;
  transition: all var(--transition);
}

.action-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
}

/* Fretboards Section */
.fretboards-section {
  padding: 2rem 0;
}

.fretboard-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.fretboard-wrapper h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  text-align: center;
}

.fretboard {
  display: grid;
  grid-template-columns: 13 repeat(12, 1fr);
  gap: 1px;
  background: var(--string-color);
  border: 2px solid var(--fret-color);
  border-radius: 4px;
  overflow: hidden;
}

.fret-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
  background: var(--bg-secondary);
}

.fret-cell:hover {
  filter: brightness(1.3);
  z-index: 1;
}

.fret-cell.root {
  background: var(--root-color);
  color: white;
}

.fret-cell.scale {
  background: var(--scale-color);
  color: var(--bg-primary);
}

.fret-cell.chord {
  box-shadow: inset 0 0 0 2px var(--chord-color);
}

.fret-cell.shared {
  box-shadow: inset 0 0 0 2px var(--shared-color);
}

.fret-cell.empty {
  background: var(--bg-secondary);
}

.fret-labels {
  display: grid;
  grid-template-columns: repeat(13, 1fr);
  gap: 1px;
  margin-top: 0.25rem;
  font-size: 0.7rem;
  color: var(--text-secondary);
  text-align: center;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: center;
  padding: 1rem;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.root { background: var(--root-color); }
.dot.scale { background: var(--scale-color); }
.dot.chord { background: var(--chord-color); }
.dot.shared { background: var(--shared-color); }

/* Info Section */
.info-section {
  padding: 3rem 0;
  background: var(--bg-secondary);
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.info-card {
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--border-radius);
  border: 1px solid rgba(255,255,255,0.05);
}

.info-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
}

.info-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* FAQ Section */
.faq-section {
  padding: 3rem 0;
}

.faq-section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.details {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.details summary {
  padding: 1rem 1.5rem;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.details summary::-webkit-details-marker {
  display: none;
}

.details summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--accent);
}

.details[open] summary::after {
  content: '−';
}

.details p {
  padding: 0 1.5rem 1rem;
  color: var(--text-secondary);
}

/* Footer */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 2rem 0;
  text-align: center;
}

.site-footer p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

.last-updated {
  font-size: 0.75rem;
  opacity: 0.7;
}

/* Responsive */
@media (max-width: 900px) {
  .panel-controls {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .fretboard-container {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .global-controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  .toggle-group {
    justify-content: center;
  }
}

@media (max-width: 600px) {
  .site-header .container {
    flex-direction: column;
    gap: 1rem;
  }
  
  .main-nav {
    gap: 1rem;
  }
  
  .hero {
    padding: 2rem 0 1.5rem;
  }
  
  .preset-buttons {
    flex-direction: column;
  }
  
  .preset-btn {
    width: 100%;
    text-align: center;
  }
  
  .fret-cell {
    font-size: 0.5rem;
  }
  
  .info-grid {
    grid-template-columns: 1fr;
  }
}

/* Print Styles */
@media print {
  .site-header,
  .controls-section,
  .site-footer,
  .info-section,
  .faq-section {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .fretboards-section {
    padding: 0;
  }
  
  .fretboard-wrapper {
    page-break-inside: avoid;
  }
  
  .fret-cell {
    border: 1px solid #ccc;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}

/* Focus styles for accessibility */
button:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Animation for note playback */
@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.fret-cell.playing {
  animation: pulse 0.3s ease;
}


/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}