:root {
    color-scheme: dark light;
    
    /* Design Tokens - Dark Mode (Default / Premium space slate) */
    --bg-base-dark: #080914;
    --bg-surface-dark: rgba(22, 26, 48, 0.45);
    --border-color-dark: rgba(255, 255, 255, 0.08);
    --text-primary-dark: #f8fafc;
    --text-secondary-dark: #94a3b8;
    --accent-glow-1-dark: rgba(139, 92, 246, 0.28);
    --accent-glow-2-dark: rgba(236, 72, 153, 0.22);
    --accent-glow-3-dark: rgba(59, 130, 246, 0.22);
    
    /* Design Tokens - Light Mode */
    --bg-base-light: #f6f8fd;
    --bg-surface-light: rgba(255, 255, 255, 0.75);
    --border-color-light: rgba(0, 0, 0, 0.08);
    --text-primary-light: #0f172a;
    --text-secondary-light: #475569;
    --accent-glow-1-light: rgba(139, 92, 246, 0.08);
    --accent-glow-2-light: rgba(236, 72, 153, 0.06);
    --accent-glow-3-light: rgba(59, 130, 246, 0.06);

    /* Resolved Variables using light-dark() */
    --bg-base: light-dark(var(--bg-base-light), var(--bg-base-dark));
    --bg-surface: light-dark(var(--bg-surface-light), var(--bg-surface-dark));
    --border-color: light-dark(var(--border-color-light), var(--border-color-dark));
    --text-primary: light-dark(var(--text-primary-light), var(--text-primary-dark));
    --text-secondary: light-dark(var(--text-secondary-light), var(--text-secondary-dark));
    --accent-glow-1: light-dark(var(--accent-glow-1-light), var(--accent-glow-1-dark));
    --accent-glow-2: light-dark(var(--accent-glow-2-light), var(--accent-glow-2-dark));
    --accent-glow-3: light-dark(var(--accent-glow-3-light), var(--accent-glow-3-dark));

    /* Accents */
    --accent-primary: #8b5cf6;
    --accent-primary-hover: #7c3aed;
    --accent-secondary: #ec4899;
    --accent-success: #10b981;
    --accent-success-hover: #059669;
    --accent-info: #3b82f6;
    --accent-warning: #f59e0b;
    --accent-error: #ef4444;

    /* Focus indicators */
    --focus-ring: 0 0 0 3px rgba(139, 92, 246, 0.4);
    
    /* Scrollbars */
    --scrollbar-track: light-dark(#edf2f7, #111322);
    --scrollbar-thumb: light-dark(#cbd5e1, #2b304d);
    --scrollbar-thumb-hover: light-dark(#94a3b8, #3f466e);
}

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

body {
    font-family: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    padding-bottom: 60px;
}

/* Decorative Background Glows */
.bg-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(140px);
    z-index: -1;
    pointer-events: none;
    opacity: 0.8;
    transition: all 0.5s ease;
}

.bg-glow-1 {
    width: 600px;
    height: 600px;
    background: var(--accent-glow-1);
    top: -200px;
    left: -200px;
}

.bg-glow-2 {
    width: 500px;
    height: 500px;
    background: var(--accent-glow-2);
    bottom: -150px;
    right: -150px;
}

.bg-glow-3 {
    width: 400px;
    height: 400px;
    background: var(--accent-glow-3);
    top: 30%;
    left: 60%;
}

/* Custom Scrollbars */
:root {
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
    scrollbar-width: thin;
}

/* For non-compliant or legacy WebKit browsers */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
    z-index: 1;
}

header {
    text-align: center;
    margin-bottom: 50px;
}

header h1 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #a78bfa 0%, #ec4899 50%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-fill-color: transparent;
    filter: drop-shadow(0 2px 8px rgba(139, 92, 246, 0.15));
}

header p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    font-weight: 450;
    max-width: 600px;
    margin: 0 auto;
}

/* Upload Section */
.upload-section {
    margin-bottom: 40px;
}

.upload-area {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 2px dashed var(--border-color);
    border-radius: 20px;
    padding: 60px 40px;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 20px;
    padding: 2px;
    background: linear-gradient(135deg, transparent, transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
    transition: all 0.4s ease;
}

.upload-area:hover {
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 20px 40px rgba(139, 92, 246, 0.18);
    background: light-dark(rgba(255, 255, 255, 0.85), rgba(30, 35, 65, 0.55));
}

.upload-area:hover::before {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
}

.upload-area.dragover {
    border-color: transparent;
    background: light-dark(rgba(139, 92, 246, 0.05), rgba(139, 92, 246, 0.12));
    transform: scale(1.02);
    box-shadow: 0 20px 50px rgba(139, 92, 246, 0.25);
}

.upload-area.dragover::before {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
}

.upload-content .upload-icon {
    font-size: 3.5rem;
    margin-bottom: 24px;
    display: inline-block;
    filter: drop-shadow(0 4px 10px rgba(139, 92, 246, 0.2));
    transition: transform 0.3s ease;
}

.upload-area:hover .upload-icon {
    transform: scale(1.1) translateY(-4px);
}

.upload-content p {
    font-size: 1.15rem;
    margin-bottom: 24px;
    color: var(--text-primary);
    font-weight: 600;
}

.upload-btn {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    padding: 14px 32px;
    border-radius: 14px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 4px 20px rgba(139, 92, 246, 0.35);
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.5);
    filter: brightness(1.05);
}

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

/* Analysis Section styling */
.analysis-section {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    margin-bottom: 40px;
}

.results-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

@media (max-width: 868px) {
    .results-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

.scale-analysis, .chord-suggestions {
    background: light-dark(rgba(0, 0, 0, 0.02), rgba(255, 255, 255, 0.025));
    padding: 30px;
    border-radius: 18px;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.scale-analysis::before, .chord-suggestions::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
}

.scale-analysis h2, .chord-suggestions h2 {
    color: var(--text-primary);
    margin-bottom: 24px;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.scale-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.scale-info > div {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: light-dark(rgba(255, 255, 255, 0.8), rgba(15, 18, 36, 0.5));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.scale-info > div:hover {
    border-color: rgba(139, 92, 246, 0.3);
    background: light-dark(rgba(255, 255, 255, 0.95), rgba(25, 30, 58, 0.6));
}

.scale-info label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.scale-info span {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1.1rem;
}

#detectedScale {
    color: var(--accent-primary);
    text-shadow: 0 0 10px rgba(139, 92, 246, 0.15);
}

#confidence {
    color: var(--accent-secondary);
    text-shadow: 0 0 10px rgba(236, 72, 153, 0.15);
}

/* Notes chips */
.notes-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    max-width: 70%;
    justify-content: flex-end;
}

.note-chip {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(236, 72, 153, 0.15));
    border: 1px solid rgba(139, 92, 246, 0.25);
    color: var(--text-primary);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.note-chip:hover {
    transform: translateY(-1px);
    border-color: var(--accent-primary);
    box-shadow: 0 0 10px rgba(139, 92, 246, 0.2);
}

/* Chords suggestions */
.chord-list {
    display: grid;
    gap: 12px;
    margin-bottom: 24px;
}

.chord-item {
    background: light-dark(rgba(255, 255, 255, 0.8), rgba(15, 18, 36, 0.5));
    border: 1px solid var(--border-color);
    padding: 16px 20px;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.chord-item:hover {
    transform: translateX(4px);
    border-color: rgba(139, 92, 246, 0.3);
    background: light-dark(rgba(255, 255, 255, 0.95), rgba(25, 30, 58, 0.6));
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.chord-name {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.chord-notes {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.05em;
}

.chord-function {
    background: light-dark(rgba(59, 130, 246, 0.1), rgba(59, 130, 246, 0.15));
    color: light-dark(#1d4ed8, #60a5fa);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid light-dark(rgba(59, 130, 246, 0.2), rgba(59, 130, 246, 0.3));
}

.export-section {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.export-btn {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    border: none;
    padding: 14px 30px;
    border-radius: 14px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
}

.export-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.5);
    filter: brightness(1.05);
}

.export-btn:disabled {
    background: light-dark(#e5e7eb, #1f293d);
    color: light-dark(#9ca3af, #4b5563);
    border: 1px solid var(--border-color);
    cursor: not-allowed;
    box-shadow: none;
}

/* Guitar Tabs Panel */
.guitar-tabs-section {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
    margin-bottom: 40px;
}

.guitar-tabs-section h2 {
    color: var(--text-primary);
    margin-bottom: 30px;
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
}

.guitar-tabs-section h2::before {
    content: "🎸";
    margin-right: 12px;
    font-size: 1.3em;
}

.tab-controls {
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.tuning-controls {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.tab-buttons {
    display: flex;
    gap: 12px;
}

.tab-control-btn {
    background: linear-gradient(135deg, #a78bfa, #ec4899);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 14px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 4px 15px rgba(236, 72, 153, 0.3);
}

.tab-control-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(236, 72, 153, 0.45);
    filter: brightness(1.05);
}

.tuning-selector-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.tuning-selector-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.tuning-selector {
    padding: 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: light-dark(white, #111424);
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
}

.tuning-selector:hover {
    border-color: var(--accent-primary);
}

.tuning-selector:focus {
    border-color: var(--accent-primary);
    box-shadow: var(--focus-ring);
}

.tuning-display {
    text-align: left;
    display: flex;
    align-items: center;
    gap: 12px;
}

.tuning-name {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 0.95rem;
    margin-bottom: 0;
}

.tuning-strings {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
}

.tuning-string {
    background: light-dark(rgba(0, 0, 0, 0.05), rgba(255, 255, 255, 0.05));
    padding: 4px 8px;
    border-radius: 6px;
    font-weight: bold;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.tuning-string:first-child {
    background: light-dark(#fee2e2, rgba(239, 68, 68, 0.15));
    color: light-dark(#b91c1c, #f87171);
    border-color: light-dark(#fca5a5, rgba(239, 68, 68, 0.3));
}

.guitar-tabs-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.chord-tab-container {
    background: light-dark(rgba(0, 0, 0, 0.015), rgba(255, 255, 255, 0.015));
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 24px;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    flex-direction: column;
}

.chord-tab-container:hover {
    border-color: rgba(139, 92, 246, 0.3);
    background: light-dark(rgba(255, 255, 255, 0.9), rgba(20, 24, 45, 0.6));
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.chord-tab-container.no-tab {
    opacity: 0.6;
    border-style: dashed;
}

.chord-tab-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.chord-roman {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.chord-function-label {
    background: light-dark(rgba(139, 92, 246, 0.1), rgba(139, 92, 246, 0.15));
    color: light-dark(#6d28d9, #a78bfa);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid light-dark(rgba(139, 92, 246, 0.2), rgba(139, 92, 246, 0.3));
}

.guitar-chord-container {
    text-align: center;
    width: 100%;
}

.chord-name-header {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: -0.02em;
}

.fingering-name {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-weight: 550;
}

/* Monospace Guitar Fretboard Diagram */
.tab-diagram {
    font-family: 'JetBrains Mono', monospace;
    background: light-dark(#f8fafc, #0a0c16);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    margin: 12px 0;
    overflow-x: auto;
    display: inline-block;
    min-width: 100%;
    position: relative;
}

.fret-header {
    display: flex;
    margin-bottom: 8px;
    font-weight: 800;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 4px;
}

.string-row {
    display: flex;
    margin: 4px 0;
    align-items: center;
    height: 24px;
    position: relative;
}

.string-row::after {
    content: '';
    position: absolute;
    left: 28px;
    right: 0;
    height: 1px;
    background: light-dark(#cbd5e1, #334155);
    z-index: 1;
}

.string-row:nth-child(2)::after { height: 1px; }
.string-row:nth-child(3)::after { height: 1px; }
.string-row:nth-child(4)::after { height: 2px; }
.string-row:nth-child(5)::after { height: 2px; }
.string-row:nth-child(6)::after { height: 3px; }
.string-row:nth-child(7)::after { height: 3.5px; }

.string-label {
    width: 20px;
    text-align: center;
    font-weight: 800;
    color: var(--accent-primary);
    margin-right: 12px;
    z-index: 2;
    font-size: 0.95rem;
    flex-shrink: 0;
}

.fret-label {
    width: 32px;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.fret-cell {
    width: 32px;
    height: 24px;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    line-height: 1;
    z-index: 2;
    color: transparent;
    flex-shrink: 0;
}

.fret-cell.fretted {
    color: white;
    font-weight: bold;
    font-size: 0.85rem;
    position: relative;
}

.fret-cell.fretted::before {
    content: '';
    position: absolute;
    width: 22px;
    height: 22px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(139, 92, 246, 0.4);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: -1;
}

.fret-cell.open {
    color: var(--accent-success);
    font-weight: 800;
    font-size: 0.95rem;
}

.fret-cell.muted {
    color: var(--accent-error);
    font-weight: 800;
    font-size: 0.95rem;
}

.fret-cell:not(.fretted):not(.open):not(.muted) {
    color: transparent;
}

.difficulty-indicator {
    margin-top: 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.difficulty-indicator span {
    background: light-dark(rgba(0, 0, 0, 0.04), rgba(255, 255, 255, 0.05));
    padding: 6px 12px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.fingering-selector-container {
    text-align: center;
    width: 100%;
}

.fingering-selector {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    background: light-dark(white, #111424);
    margin-bottom: 16px;
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 600;
    outline: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.fingering-selector:hover {
    border-color: var(--accent-primary);
}

.fingering-selector:focus {
    border-color: var(--accent-primary);
    box-shadow: var(--focus-ring);
}

.diagram-container {
    min-height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.compact-tab-container {
    background: light-dark(rgba(0, 0, 0, 0.015), rgba(255, 255, 255, 0.015));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    margin: 12px 0;
}

.compact-chord-name {
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
    font-size: 1.1rem;
}

.compact-tab-notation {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    background: light-dark(#f8fafc, #0a0c16);
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.tab-string-line {
    margin: 4px 0;
    display: flex;
    align-items: center;
}

.string-name {
    color: var(--accent-primary);
    font-weight: bold;
    margin-right: 8px;
    width: 20px;
}

.fret-notation {
    color: var(--text-primary);
    letter-spacing: 0.1em;
}

.no-tab-available {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-secondary);
    border: 1px dashed var(--border-color);
    border-radius: 16px;
}

.no-tab-message {
    font-style: italic;
    margin-top: 8px;
    font-size: 0.9rem;
}

.no-tabs-message {
    text-align: center;
    padding: 50px 20px;
    color: var(--text-secondary);
    font-style: italic;
    grid-column: 1 / -1;
    font-size: 1.05rem;
}

.guitar-help-info {
    background: light-dark(rgba(139, 92, 246, 0.03), rgba(139, 92, 246, 0.05));
    border-radius: 16px;
    padding: 24px;
    margin-top: 40px;
    border: 1px solid rgba(139, 92, 246, 0.2);
    border-left: 4px solid var(--accent-primary);
}

.guitar-help-info h3 {
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 1.2rem;
    font-weight: 700;
}

.guitar-help-info ul {
    list-style: none;
    padding: 0;
    margin-bottom: 16px;
}

.guitar-help-info li {
    margin: 10px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.guitar-help-info li::before {
    content: "♪";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: bold;
}

.guitar-help-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* Accordion Accordion styling */
.additional-info {
    background: light-dark(rgba(0, 0, 0, 0.015), rgba(255, 255, 255, 0.015));
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 8px;
    margin-bottom: 30px;
    transition: all 0.3s ease;
}

.additional-info:hover {
    border-color: rgba(139, 92, 246, 0.2);
}

.additional-info summary {
    font-weight: 700;
    cursor: pointer;
    padding: 16px 20px;
    border-radius: 10px;
    transition: all 0.3s ease;
    color: var(--text-primary);
    outline: none;
    user-select: none;
}

.additional-info summary:hover {
    background-color: light-dark(rgba(0, 0, 0, 0.03), rgba(255, 255, 255, 0.03));
}

.details-content {
    margin-top: 10px;
    padding: 20px;
    background: light-dark(white, #111424);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    line-height: 1.8;
    color: var(--text-secondary);
}

.details-content p {
    margin-bottom: 12px;
}

.details-content p:last-child {
    margin-bottom: 0;
}

/* Explainer (How it works) bottom block */
.info-section {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
}

.info-section h3 {
    color: var(--text-primary);
    margin-bottom: 16px;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.info-section p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1.05rem;
    max-width: 700px;
    margin: 0 auto;
}

/* Loading & error states */
.loading {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid light-dark(rgba(139, 92, 246, 0.1), rgba(139, 92, 246, 0.2));
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s cubic-bezier(0.5, 0, 0.5, 1) infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    background: light-dark(#fee2e2, rgba(239, 68, 68, 0.15));
    color: light-dark(#b91c1c, #f87171);
    padding: 16px 20px;
    border-radius: 12px;
    margin: 12px 0;
    border-left: 4px solid var(--accent-error);
    border-top: 1px solid light-dark(#fca5a5, rgba(239, 68, 68, 0.2));
    border-bottom: 1px solid light-dark(#fca5a5, rgba(239, 68, 68, 0.2));
    border-right: 1px solid light-dark(#fca5a5, rgba(239, 68, 68, 0.2));
    font-weight: 600;
    font-size: 0.95rem;
}

.success {
    background: light-dark(#d1fae5, rgba(16, 185, 129, 0.15));
    color: light-dark(#065f46, #34d399);
    padding: 16px 20px;
    border-radius: 12px;
    margin: 12px 0;
    border-left: 4px solid var(--accent-success);
    border-top: 1px solid light-dark(#a7f3d0, rgba(16, 185, 129, 0.2));
    border-bottom: 1px solid light-dark(#a7f3d0, rgba(16, 185, 129, 0.2));
    border-right: 1px solid light-dark(#a7f3d0, rgba(16, 185, 129, 0.2));
    font-weight: 600;
    font-size: 0.95rem;
}

/* Responsiveness enhancements */
@media (max-width: 768px) {
    .container {
        padding: 20px 10px;
    }
    
    header h1 {
        font-size: 2.25rem;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .analysis-section, .guitar-tabs-section, .info-section {
        padding: 24px 16px;
        border-radius: 18px;
    }
    
    .guitar-tabs-list {
        grid-template-columns: 1fr;
    }
    
    .tab-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .tuning-controls {
        width: 100%;
        justify-content: space-between;
    }
    
    .tuning-display {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
    
    .tab-buttons {
        width: 100%;
    }
    
    .tab-control-btn {
        flex: 1;
        text-align: center;
    }
    
    .notes-list {
        max-width: 100%;
        justify-content: flex-start;
        margin-top: 8px;
    }
    
    .scale-info > div {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}

/* Footer Styling */
footer {
    text-align: center;
    margin-top: 60px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

footer a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    display: inline-block;
}

footer a::after {
    content: '';
    position: absolute;
    width: 100%;
    transform: scaleX(0);
    height: 2px;
    bottom: -2px;
    left: 0;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    transform-origin: bottom right;
    transition: transform 0.25s ease-out;
}

footer a:hover {
    color: var(--accent-secondary);
}

footer a:hover::after {
    transform: scaleX(1);
    transform-origin: bottom left;
}