/* ========================================
   CSS Custom Properties & Theme
   ======================================== */
:root {
    /* Colors - Light Mode */
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent-primary: #6366f1;
    --accent-secondary: #818cf8;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

    /* Circle of Fifths Colors */
    --circle-bg: var(--bg-card);
    --circle-text: var(--text-primary);
    --circle-highlight: var(--accent-secondary);
}

/* ========================================
   Circle of Fifths
   ======================================== */
.circle-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: var(--bg-secondary);
    /* Use secondary (white) for card effect */
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.circle-container {
    width: 300px;
    height: 300px;
    margin-bottom: var(--spacing-md);
    position: relative;
    /* transition: transform var(--transition-normal); Removed transform to avoid conflicts */
}

.circle-info h3 {
    text-align: center;
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.circle-info p {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* SVG Styles */
.circle-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-15deg);
    /* Offset so C is exactly Top Center? No, C is 0deg. 12 slices = 30each. C should be center of top slice. Top is -90. If slice 0 is 0-30... center is 15. So rotate -90 - 15 = -105. */
    /* Let's handle rotation in JS or simplified CSS */
    overflow: visible;
}

.sector-group {
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sector-shape {
    stroke: var(--bg-primary);
    /* Gap color */
    stroke-width: 2px;
    transition: all var(--transition-fast);
}

.sector-outer {
    fill: var(--bg-tertiary);
}

.sector-inner {
    fill: var(--bg-secondary);
    /* Make inner slightly darker? */
    filter: brightness(0.95);
}

[data-theme='dark'] .sector-inner {
    filter: brightness(1.2);
}

.sector-group:hover .sector-shape {
    fill: var(--accent-secondary);
    opacity: 0.5;
}

.sector-group.active .sector-shape {
    fill: var(--accent-primary);
    opacity: 1;
    filter: none;
}

.sector-group.neighbor .sector-shape {
    fill: var(--accent-secondary);
    opacity: 0.3;
}

.sector-label {
    fill: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 12px;
    pointer-events: none;
    text-anchor: middle;
    dominant-baseline: middle;
    transition: fill var(--transition-fast);
}

.sector-group.active .sector-label {
    fill: white;
    font-weight: 700;
}

:root {
    --fretboard-bg: #1e293b;
    --fret-color: #64748b;
    --string-color: #94a3b8;
    --finger-bg: var(--accent-primary);
    --finger-text: #ffffff;
    --recommended-border: #10b981;
    --recommended-glow: 0 0 15px rgba(16, 185, 129, 0.4);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Borders */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark Mode */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    --fretboard-bg: #0f172a;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-md);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ========================================
   App Container
   ======================================== */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Header
   ======================================== */
/* ========================================
   Header
   ======================================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-xl);
    position: sticky;
    top: 0;
    z-index: 100;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

[data-theme='dark'] .header {
    background: rgba(15, 23, 42, 0.8);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: inherit;
}

.logo-icon-wrapper {
    width: 40px;
    height: 40px;
    /* Background is now in the image */
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
    overflow: hidden;
    /* Clip the square image to rounded corners */
}

.app-logo-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.logo h1 {
    font-family: 'Outfit', sans-serif;
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: -0.01em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

.dark-mode-toggle {
    width: 44px;
    height: 44px;
    border: none;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.dark-mode-toggle:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.dark-mode-toggle svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
    transition: transform var(--transition-normal);
}

.sun-icon {
    display: block;
}

.moon-icon {
    display: none;
}

[data-theme="dark"] .sun-icon {
    display: none;
}

[data-theme="dark"] .moon-icon {
    display: block;
}

/* ========================================
   Control Panel
   ======================================== */
.control-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.control-group label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.select-input,
.text-input {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-md);
    font-family: var(--font-family);
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.select-input:hover,
.text-input:hover {
    border-color: var(--accent-secondary);
}

.select-input:focus,
.text-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.input-hint {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

.custom-input-group {
    grid-column: 1 / -1;
}

/* ========================================
   Action Buttons
   ======================================== */
.action-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-md);
    font-weight: 600;
    font-family: var(--font-family);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.btn-icon svg {
    width: 20px;
    height: 20px;
    color: var(--text-primary);
}

.transpose-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-left: auto;
}

.transpose-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

/* ========================================
   Diatonic Reference
   ======================================== */
.diatonic-reference {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--border-color);
}

.diatonic-reference h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.diatonic-reference h2 span {
    color: var(--accent-primary);
}

.diatonic-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: var(--spacing-sm);
}

.diatonic-chord {
    text-align: center;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: 2px solid transparent;
}

.diatonic-chord:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
}

.diatonic-chord.active {
    background: var(--accent-primary);
    color: white;
}

.diatonic-numeral {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.diatonic-chord.active .diatonic-numeral {
    color: rgba(255, 255, 255, 0.8);
}

.diatonic-name {
    font-size: var(--font-size-md);
    font-weight: 700;
}

/* ========================================
   Progression Display
   ======================================== */
.progression-display {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-xl);
}

.progression-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.progression-header h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.progression-numerals {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.numeral-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.numeral-text {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--accent-primary);
}

.chord-name-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.numeral-arrow {
    font-size: var(--font-size-xl);
    color: var(--text-muted);
}

/* ========================================
   Chord Cards
   ======================================== */
.chord-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.chord-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.chord-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.chord-card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.chord-card-numeral {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.voicing-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.voicing-option {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    transition: all var(--transition-fast);
}

.voicing-option.recommended {
    border-color: var(--recommended-border);
    box-shadow: var(--recommended-glow);
}

.voicing-option.recommended::before {
    content: '★ Best';
    position: absolute;
    top: -10px;
    left: 10px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--recommended-border);
    background: var(--bg-secondary);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.voicing-option {
    position: relative;
}

.voicing-label {
    flex-shrink: 0;
    width: 70px;
}

.voicing-type {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.voicing-fret {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

/* ========================================
   Chord Diagram
   ======================================== */
.chord-diagram {
    flex: 1;
}

.chord-diagram svg {
    width: 100%;
    max-width: 140px;
    height: auto;
}

/* Chord diagram styling */
.chord-diagram .fretboard,
.scale-diagram .fretboard {
    fill: var(--fretboard-bg);
}

.chord-diagram .fret,
.scale-diagram .fret {
    stroke: var(--fret-color);
    stroke-width: 1;
}

.chord-diagram .string,
.scale-diagram .string {
    stroke: var(--string-color);
    stroke-width: 1.5;
}

.chord-diagram .nut,
.scale-diagram .nut {
    stroke: var(--string-color);
    stroke-width: 4;
}

.chord-diagram .finger,
.scale-diagram .finger {
    fill: var(--finger-bg);
}

.chord-diagram .finger-text,
.scale-diagram .finger-text {
    fill: var(--finger-text);
    font-size: 10px;
    font-weight: 600;
    font-family: var(--font-family);
}

.chord-diagram .muted,
.scale-diagram .muted {
    stroke: var(--text-muted);
    stroke-width: 2;
}

.chord-diagram .open,
.scale-diagram .open {
    stroke: var(--text-secondary);
    stroke-width: 2;
    fill: none;
}

.chord-diagram .fret-number,
.scale-diagram .fret-number {
    fill: var(--text-muted);
    font-size: 10px;
    font-family: var(--font-family);
}

.chord-diagram .barre,
.scale-diagram .barre {
    fill: var(--finger-bg);
    rx: 8;
    ry: 8;
}



/* ======================================== 
   Scales Panel
   ======================================== */
.scales-panel {
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    margin-top: var(--spacing-lg);
}

.scales-panel h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-md);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.scales-panel h3 svg {
    width: 18px;
    height: 18px;
    color: var(--accent-primary);
}

.scales-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.scale-item {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 2px solid transparent;
    transition: all var(--transition-fast);
}

.scale-item:hover {
    border-color: var(--accent-secondary);
    transform: translateY(-2px);
}

.scale-item.primary {
    border-color: var(--recommended-border);
    box-shadow: var(--recommended-glow);
}

.scale-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.scale-name {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--text-primary);
}

.scale-badge {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--recommended-border);
    background: rgba(16, 185, 129, 0.1);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.scale-notes {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-xs);
    font-family: monospace;
    letter-spacing: 0.05em;
}

.scale-description {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}

/* Fretboard Diagram Container */
.fretboard-container {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.fretboard-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
}

.position-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    flex: 1;
}

.fretboard-nav {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.fretboard-nav:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.fretboard-nav:hover svg {
    color: white;
}

.fretboard-nav svg {
    width: 16px;
    height: 16px;
    color: var(--text-secondary);
}

.fretboard-diagram {
    display: flex;
    justify-content: center;
    padding: var(--spacing-sm) 0;
}

.fretboard-svg {
    width: 100%;
    max-width: 300px;
    height: auto;
}

/* SVG Fretboard Styling */
.fretboard-bg {
    fill: var(--fretboard-bg);
}

.fret-line {
    stroke: var(--fret-color);
    stroke-width: 1;
}

.string-line {
    stroke: var(--string-color);
}

.fret-label {
    fill: var(--text-muted);
    font-size: 9px;
    font-family: var(--font-family);
}

.fret-marker {
    fill: var(--text-muted);
    opacity: 0.3;
}

.scale-note {
    fill: var(--accent-primary);
    stroke: white;
    stroke-width: 1;
}

.scale-note.root {
    fill: var(--recommended-border);
}

.note-label {
    fill: white;
    font-size: 8px;
    font-weight: 700;
    font-family: var(--font-family);
}

/* Position Dots */
.position-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.position-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.position-dot:hover {
    background: var(--text-muted);
}

.position-dot.active {
    background: var(--accent-primary);
    width: 20px;
}

.no-diagram {
    text-align: center;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    padding: var(--spacing-md);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    margin-top: auto;
    text-align: center;
    padding: var(--spacing-xl) 0;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* ========================================
   Empty State
   ======================================== */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-muted);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state p {
    font-size: var(--font-size-lg);
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

.chord-card {
    animation: fadeIn var(--transition-normal) ease-out;
}

.chord-card:nth-child(1) {
    animation-delay: 0ms;
}

.chord-card:nth-child(2) {
    animation-delay: 100ms;
}

.chord-card:nth-child(3) {
    animation-delay: 200ms;
}

.chord-card:nth-child(4) {
    animation-delay: 300ms;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-sm);
    }

    .header {
        padding: var(--spacing-md) 0;
    }

    .logo h1 {
        font-size: var(--font-size-xl);
    }

    .control-panel {
        grid-template-columns: 1fr;
    }

    .action-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn {
        justify-content: center;
    }

    .transpose-group {
        margin-left: 0;
        justify-content: center;
    }

    .diatonic-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .diatonic-grid .diatonic-chord:nth-child(5),
    .diatonic-grid .diatonic-chord:nth-child(6),
    .diatonic-grid .diatonic-chord:nth-child(7) {
        grid-column: span 1;
    }

    .progression-display {
        padding: var(--spacing-md);
    }

    .chord-cards {
        grid-template-columns: 1fr;
    }

    .progression-numerals {
        gap: var(--spacing-md);
    }

    .numeral-text {
        font-size: var(--font-size-xl);
    }

    .voicing-option {
        flex-direction: column;
    }

    .voicing-label {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .diatonic-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .numeral-arrow {
        display: none;
    }

    .progression-numerals {
        gap: var(--spacing-sm);
    }
}

/* ========================================
   Scrollbar Styling
   ======================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: var(--radius-full);
}


/* ========================================
   Chord Modification UI
   ======================================== */

.chord-card {
    position: relative;
    /* Context for absolute positioning if needed */
}

.chord-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-right: 32px;
    /* Space for edit button */
}

.edit-chord-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    opacity: 0.8;
}

.edit-chord-btn:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    opacity: 1;
    transform: scale(1.05);
}

.edit-chord-btn svg {
    width: 14px;
    height: 14px;
}

.modification-panel {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    animation: slideDown 0.2s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.flavor-category {
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    margin-top: var(--spacing-sm);
}

.flavor-category:first-of-type {
    margin-top: 0;
}

.flavor-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    /* 3 buttons per row */
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.flavor-btn {
    padding: 8px 6px;
    font-size: 0.85rem;
    font-family: var(--font-family);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    /* Slightly lighter contrast on tertiary card */
    color: var(--text-secondary);
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-fast);
}

.flavor-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    background: var(--bg-secondary);
}

.flavor-btn.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.close-panel-btn {
    width: 100%;
    padding: var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    background: transparent;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    margin-top: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.close-panel-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
    background: var(--bg-secondary);
}

/* ========================================
   Scale Positions Section
   ======================================== */
.scales-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-xl);
}

.scales-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.scales-header-row h2 {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin: 0;
}

.scale-controls {
    display: flex;
    gap: var(--spacing-md);
}

.scale-controls .select-input {
    min-width: 180px;
}

/* Scale Header (inside scalesDisplay) */
.scale-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.scale-header h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--accent-primary);
    margin: 0 0 var(--spacing-md) 0;
}

.scale-notes-display {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.scale-degree {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 var(--spacing-sm);
    font-size: var(--font-size-md);
    font-weight: 600;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-family);
}

.scale-degree.root {
    background: var(--accent-primary);
    color: white;
}

/* Scale Positions Grid */
.scale-positions-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-md);
}

/* Scale Position Card */
.scale-position-card {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.scale-position-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.position-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.position-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-primary);
}

.position-fret {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    font-weight: 500;
}

/* Scale Diagram Container */
.scale-diagram-container {
    display: flex;
    justify-content: center;
    padding: var(--spacing-sm) 0;
}

.scale-diagram-container svg {
    width: 100%;
    max-width: 120px;
    height: auto;
}

/* Scale SVG Styling */
.scale-svg .fretboard {
    fill: var(--fretboard-bg);
}

.scale-svg .fret {
    stroke: var(--fret-color);
    stroke-width: 1;
}

.scale-svg .string {
    stroke: var(--string-color);
    stroke-width: 1.5;
}

.scale-svg .nut {
    stroke: var(--string-color);
    stroke-width: 4;
}

.scale-svg .fret-number {
    fill: var(--text-muted);
    font-size: 10px;
    font-family: var(--font-family);
}

/* Scale Notes - Root is filled black, others are hollow */
.scale-note-root {
    fill: var(--text-primary);
    stroke: var(--text-primary);
    stroke-width: 1;
}

.scale-note-root.open {
    fill: var(--text-primary);
    stroke: var(--text-primary);
    stroke-width: 1;
}

.scale-note {
    fill: var(--accent-primary);
    stroke: white;
    stroke-width: 1;
}

.scale-note.open {
    fill: var(--accent-primary);
    stroke: white;
    stroke-width: 1;
}

/* Hollow scale notes - matching reference diagram style */
.scale-note-hollow {
    fill: none;
    stroke: var(--text-primary);
    stroke-width: 2;
}

/* String labels at top of fretboard */
.string-label {
    fill: var(--text-primary);
    font-size: 10px;
    font-weight: 600;
    font-family: var(--font-family);
}

/* Fret number at bottom */
.fret-number-label {
    fill: var(--text-primary);
    font-size: 11px;
    font-weight: 600;
    font-family: var(--font-family);
}

.scale-note-text {
    fill: white;
    font-size: 9px;
    font-weight: 700;
    font-family: var(--font-family);
}

.scale-note-text.root {
    fill: white;
}

/* Responsive Scale Grid */
@media (max-width: 1200px) {
    .scale-positions-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .scales-header-row {
        flex-direction: column;
        align-items: stretch;
    }

    .scale-controls {
        justify-content: center;
    }

    .scale-positions-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .scale-degree {
        min-width: 30px;
        height: 30px;
        font-size: var(--font-size-sm);
    }
}

@media (max-width: 480px) {
    .scale-positions-grid {
        grid-template-columns: 1fr;
    }

    .scale-diagram-container svg {
        max-width: 150px;
    }
}

/* ======================================== 
   Tabs System
   ======================================== */
.app-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    background: rgba(255, 255, 255, 0.05);
    /* Glassy background */
    padding: 0.5rem;
    border-radius: 12px;
    gap: 0.5rem;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.tab-button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s ease;
}

.tab-button:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.tab-button.active {
    background: var(--primary);
    color: white;
    /* Fallback */
    background-color: var(--accent-primary);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

[data-theme="dark"] .tab-button {
    color: var(--text-muted);
}

[data-theme="dark"] .tab-button:hover {
    color: var(--text-primary);
}

[data-theme="dark"] .tab-button.active {
    color: white;
}


/* ======================================== 
   Scale Visualization
   ======================================== */
.scale-card {
    background: var(--bg-tertiary);
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--shadow-md);
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--border-color);
}

.scale-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.scale-diagram {
    width: 100%;
    /* Remove max-width restriction or increase it for horizontal diagrams */
    max-width: 500px;
    height: auto;
    margin: 0 auto;
    display: block;
}

.scale-note {
    cursor: pointer;
    transition: all 0.2s;
}

.scale-note:hover {
    r: 12;
    filter: drop-shadow(0 0 4px rgba(0, 0, 0, 0.3));
}

.scale-notes {
    text-align: center;
    margin-top: 15px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
    font-family: 'Inter', monospace;
}

#scalesGrid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    #scalesGrid {
        grid-template-columns: 1fr;
    }
}