/* ==================== THEME SYSTEM ==================== */
        :root {
            /* Base structure */
            --header-height: 38px;
            --footer-height: 140px;
            --font-tech: 'Courier New', 'Consolas', monospace;
            --font-ui: 'Segoe UI', 'Verdana', sans-serif;
            
            /* Module colors (shared across themes - WCAG AAA compliant) */
            --mod-input-color: #fbbf24;      /* Brighter Amber */
            --mod-db-color: #22d3ee;         /* Brighter Cyan */
            --mod-score-color: #cbd5e1;      /* Lighter Grey */
            --mod-prog-color: #e879f9;       /* Brighter Magenta */
            --mod-solar-color: #22d3ee;      /* Brighter Teal */
            --mod-ref-color: #fb923c;        /* Brighter Orange */
            --mod-tool-color: #34d399;       /* Brighter Green */
        }

        /* THEME A: Clean DAW / Logic-style (subtle color bands) */
        body[data-theme="clean-daw"] {
            --bg-app: #18181b;
            --bg-panel: #27272a;
            --bg-header: #3f3f46;
            --bg-input: #09090b;
            
            --accent-primary: #60a5fa; /* Improved contrast from #3b82f6 */
            --accent-secondary: #34d399; /* Improved contrast from #10b981 */
            --accent-glow: rgba(96, 165, 250, 0.15);
            --accent-grid: rgba(255, 255, 255, 0.03);
            
            --text-main: #ffffff; /* Pure white for max contrast */
            --text-muted: #d4d4d8; /* Lighter gray for better readability */
            --text-highlight: #93c5fd;
            
            --border-light: #52525b; /* More visible borders */
            --border-hover: #60a5fa;
            
            --radius-sm: 2px;
            --radius-md: 4px;
        }

        /* THEME B: Channel Strip DAW (Reaper-ish) */
        body[data-theme="channel-strip"] {
            --bg-app: #0f172a;
            --bg-panel: #1e293b;
            --bg-header: #334155;
            --bg-input: #020617; /* Darker input background */
            
            --accent-primary: #38bdf8;
            --accent-secondary: #22d3ee;
            --accent-glow: rgba(56, 189, 248, 0.2);
            --accent-grid: rgba(56, 189, 248, 0.04);
            
            --text-main: #f8fafc;
            --text-muted: #cbd5e1; /* Lighter blue-gray */
            --text-highlight: #bae6fd;
            
            --border-light: #64748b;
            --border-hover: #38bdf8;
            
            --radius-sm: 1px;
            --radius-md: 2px;
        }

        /* THEME C: Matrix FX (darker, more glow) */
        body[data-theme="matrix-fx"] {
            --bg-app: #000000;
            --bg-panel: #050a0f;
            --bg-header: #0a1520;
            --bg-input: #000000;
            
            --accent-primary: #00f3ff;
            --accent-secondary: #00ff41;
            --accent-glow: rgba(0, 243, 255, 0.3);
            --accent-grid: rgba(0, 243, 255, 0.1);
            
            --text-main: #e0f7fa;
            --text-muted: #8ab4c5; /* Lighter cyan-gray */
            --text-highlight: #00f3ff;
            
            --border-light: #2a5c7d;
            --border-hover: #00f3ff;
            
            --radius-sm: 0px;
            --radius-md: 0px;
        }

        /* THEME D: Steam 2000 (Retro Olive/Green) */
        body[data-theme="steam-2000"] {
            --bg-app: #1e251e;
            --bg-panel: #2a352b;
            --bg-header: #3d4c3f;
            --bg-input: #121612; /* Darker input */
            
            --accent-primary: #d4e09b; /* Lighter olive for contrast */
            --accent-secondary: #a8b970;
            --accent-glow: rgba(198, 212, 126, 0.15);
            --accent-grid: rgba(198, 212, 126, 0.06);
            
            --text-main: #f0f5e9; /* Brighter text */
            --text-muted: #b8c4b0; /* Lighter muted text */
            --text-highlight: #ffffff;
            
            --border-light: #5c7060;
            --border-hover: #d4e09b;
            
            --radius-sm: 0px;
            --radius-md: 0px;
            
            /* Override fonts for that retro feel */
            --font-ui: 'Verdana', 'Tahoma', sans-serif;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        
        /* Accessibility: Focus Styles */
        :focus-visible {
            outline: 2px solid var(--accent-primary);
            outline-offset: 2px;
        }
        
        body {
            background-color: var(--bg-app);
            background-image: 
                linear-gradient(var(--accent-grid) 1px, transparent 1px),
                linear-gradient(90deg, var(--accent-grid) 1px, transparent 1px);
            background-size: 20px 20px;
            color: var(--text-main);
            font-family: var(--font-ui);
            height: 100vh;
            display: flex;
            flex-direction: column;
            overflow: auto; /* allow workspace scrolling when content exceeds viewport */
            font-size: 12px;
        }

        /* ==================== CONTROL DECK (TOP) ==================== */
        .control-deck {
            height: var(--header-height);
            background: rgba(5, 10, 15, 0.9);
            border-bottom: 1px solid var(--accent-primary);
            display: flex;
            align-items: center;
            padding: 0 12px;
            gap: 16px;
        }

        /* Hide internal titles since we have module headers */
        #number-generator-container h3 { display: none; }
        
        /* ==================== MAIN WORKSPACE ==================== */
        .workspace {
            flex: 1;
            display: grid;
            grid-template-columns: minmax(280px, var(--sidebar-left-width, 0.85fr)) 6px 1fr 6px minmax(260px, var(--sidebar-right-width, 0.75fr));
            overflow: auto;
            background: transparent;
            padding: 6px;
            gap: 0; /* Gap handled by splitters */
            align-items: start;
        }

        .splitter {
            width: 6px;
            cursor: col-resize;
            background: transparent;
            transition: background 0.2s;
            z-index: 10;
            position: relative;
        }
        .splitter:hover, .resizing .splitter {
            background: var(--accent-primary);
            box-shadow: 0 0 10px var(--accent-glow);
        }
        .splitter::after {
            content: '';
            position: absolute;
            left: 2px;
            top: 10%;
            bottom: 10%;
            width: 2px;
            background: var(--border-light);
            opacity: 0.3;
        }

        .resizing * {
            user-select: none !important;
            pointer-events: none !important;
        }
        .resizing .workspace, .resizing .splitter {
            pointer-events: all !important;
        }

        .workspace-column {
            display: flex;
            flex-direction: column;
            gap: 6px;
            overflow: visible;
            min-height: min-content;
        }
        
        .workspace-column.right-sidebar {
            position: sticky;
            top: calc(var(--header-height) + 6px);
            align-self: flex-start;
            max-height: calc(100vh - var(--header-height) - 12px);
            overflow-y: auto;
        }

        .workspace-column.center-stage {
            border: 1px solid var(--border-light);
            background: rgba(0,0,0,0.5);
            position: relative;
            padding: 0;
            gap: 6px;
            padding-bottom: 6px;
        }
        
        /* Corner decorations for center stage */
        .workspace-column.center-stage::before {
            content: '';
            position: absolute;
            top: -1px; left: -1px;
            width: 10px; height: 10px;
            border-top: 2px solid var(--accent-primary);
            border-left: 2px solid var(--accent-primary);
        }
        .workspace-column.center-stage::after {
            content: '';
            position: absolute;
            bottom: -1px; right: -1px;
            width: 10px; height: 10px;
            border-bottom: 2px solid var(--accent-primary);
            border-right: 2px solid var(--accent-primary);
        }

        /* ==================== LEARN MODULE PAGES ==================== */
        #learn-inversions-page,
        #learn-chords-page,
        #learn-piano-notes-page {
            max-width: 100%;
        }

        /* ==================== BOTTOM DECK (PIANO) ==================== */
        .bottom-deck {
            min-height: auto;
            height: clamp(160px, 25vh, 320px);
            overflow: hidden;
            background: linear-gradient(180deg, #0a0a0a 0%, #000000 100%);
            border-top: 2px solid var(--accent-primary);
            padding: 0;
            flex-shrink: 0;
            position: relative;
            z-index: 90;
            box-shadow: 
                0 -4px 20px rgba(0,0,0,0.8),
                0 -1px 0 var(--accent-primary),
                inset 0 1px 0 rgba(255,255,255,0.05);
        }
        
        /* Decorative corner accents for bottom deck */
        .bottom-deck::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 40px;
            height: 40px;
            border-top: 2px solid var(--accent-primary);
            border-left: 2px solid var(--accent-primary);
            opacity: 0.5;
        }
        
        .bottom-deck::after {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 40px;
            height: 40px;
            border-top: 2px solid var(--accent-primary);
            border-right: 2px solid var(--accent-primary);
            opacity: 0.5;
        }
        
        .bottom-deck-label {
            position: absolute;
            top: 4px;
            left: 12px;
            display: flex;
            align-items: center;
            gap: 6px;
            font-family: var(--font-tech);
            font-size: 0.6rem;
            color: var(--accent-primary);
            text-transform: uppercase;
            letter-spacing: 1.5px;
            z-index: 10;
            pointer-events: none;
        }
        
        .deck-icon {
            font-size: 0.8rem;
            filter: drop-shadow(0 0 4px var(--accent-primary));
        }
        
        /* Tech decoration in header */
        body[data-theme="matrix-fx"] .module-header::before {
            content: '■ ';
            color: var(--accent-secondary);
            margin-right: 5px;
        }

        .studio-module.is-dragging {
            opacity: 0.5;
            border: 2px dashed var(--accent-primary) !important;
            transform: scale(0.98);
            z-index: 100;
        }

        .module-header {
            cursor: grab;
        }
        .module-header:active {
            cursor: grabbing;
        }

        /* ==================== PER-MODULE COLOR THEMING ==================== */
        
        /* Theme A: Clean DAW - Subtle colored header bands only */
        body[data-theme="clean-daw"] .mod-input .module-header { color: var(--mod-input-color); }
        body[data-theme="clean-daw"] .mod-db .module-header { color: var(--mod-db-color); }
        body[data-theme="clean-daw"] .mod-score .module-header { color: var(--mod-score-color); }
        body[data-theme="clean-daw"] .mod-prog .module-header { color: var(--mod-prog-color); }
        body[data-theme="clean-daw"] .mod-solar .module-header { color: var(--mod-solar-color); }
        body[data-theme="clean-daw"] .mod-ref .module-header { color: var(--mod-ref-color); }
        body[data-theme="clean-daw"] .mod-tool .module-header { color: var(--mod-tool-color); }

        /* Theme B: Channel Strip - Header + left border with module color, body slightly tinted */
        body[data-theme="channel-strip"] .mod-input { 
            border-left: 3px solid var(--mod-input-color); 
            background: linear-gradient(90deg, rgba(245, 158, 11, 0.05) 0%, var(--bg-panel) 100%);
        }
        body[data-theme="channel-strip"] .mod-input .module-header { 
            color: var(--mod-input-color); 
            background: linear-gradient(90deg, rgba(245, 158, 11, 0.15) 0%, transparent 100%);
        }

        /* ==================== LANDING PAGE STYLES ==================== */
        .landing-page {
            font-family: var(--font-ui);
        }

        .landing-page h1, .landing-page h3 {
            font-weight: 600;
        }

        .module-card {
            background: var(--bg-panel);
            border: 1px solid var(--border-light);
            border-radius: 6px;
            padding: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .module-card:hover {
            background: rgba(96, 165, 250, 0.05);
            border-color: var(--accent-primary);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
            transform: translateY(-2px);
        }

        .module-card.selected {
            background: rgba(96, 165, 250, 0.15);
            border-color: var(--accent-primary);
            box-shadow: 0 0 12px rgba(96, 165, 250, 0.3);
        }

        .module-card-title {
            font-weight: 600;
            font-size: 1.1rem;
            color: var(--text-main);
        }

        .module-card-description {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.4;
        }

        .module-card-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
            margin-top: 8px;
        }

        .module-card-tag {
            background: rgba(96, 165, 250, 0.1);
            border: 1px solid var(--accent-primary);
            color: var(--accent-primary);
            padding: 3px 8px;
            border-radius: 3px;
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .skill-level-btn.active {
            background: var(--accent-primary) !important;
            color: #000 !important;
            border-color: var(--accent-primary) !important;
        }

        /* Mobile Responsive */
        @media (max-width: 768px) {
            #module-grid {
                grid-template-columns: 1fr !important;
            }

            .landing-page {
                padding: 15px !important;
            }

            .landing-page h1 {
                font-size: 1.8rem;
            }

            #intent-search {
                width: 100% !important;
            }

            .skill-level-btn {
                flex: 1;
                min-width: 80px;
                padding: 8px 12px !important;
                font-size: 0.8rem !important;
            }
        }

        body[data-theme="channel-strip"] .mod-db { 
            border-left: 3px solid var(--mod-db-color);
            background: linear-gradient(90deg, rgba(0, 243, 255, 0.05) 0%, var(--bg-panel) 100%);
        }
        body[data-theme="channel-strip"] .mod-db .module-header { 
            color: var(--mod-db-color);
            background: linear-gradient(90deg, rgba(0, 243, 255, 0.15) 0%, transparent 100%);
        }

        body[data-theme="channel-strip"] .mod-score { 
            border-left: 3px solid var(--mod-score-color);
        }
        body[data-theme="channel-strip"] .mod-score .module-header { 
            color: var(--mod-score-color);
        }

        body[data-theme="channel-strip"] .mod-prog { 
            border-left: 3px solid var(--mod-prog-color);
            background: linear-gradient(90deg, rgba(217, 70, 239, 0.05) 0%, var(--bg-panel) 100%);
        }
        body[data-theme="channel-strip"] .mod-prog .module-header { 
            color: var(--mod-prog-color);
            background: linear-gradient(90deg, rgba(217, 70, 239, 0.15) 0%, transparent 100%);
        }

        body[data-theme="channel-strip"] .mod-solar { 
            border-left: 3px solid var(--mod-solar-color);
            background: linear-gradient(90deg, rgba(6, 182, 212, 0.05) 0%, var(--bg-panel) 100%);
        }
        body[data-theme="channel-strip"] .mod-solar .module-header { 
            color: var(--mod-solar-color);
            background: linear-gradient(90deg, rgba(6, 182, 212, 0.15) 0%, transparent 100%);
        }

        body[data-theme="channel-strip"] .mod-ref { 
            border-left: 3px solid var(--mod-ref-color);
            background: linear-gradient(90deg, rgba(249, 115, 22, 0.05) 0%, var(--bg-panel) 100%);
        }
        body[data-theme="channel-strip"] .mod-ref .module-header { 
            color: var(--mod-ref-color);
            background: linear-gradient(90deg, rgba(249, 115, 22, 0.15) 0%, transparent 100%);
        }

        body[data-theme="channel-strip"] .mod-tool { 
            border-left: 3px solid var(--mod-tool-color);
            background: linear-gradient(90deg, rgba(16, 185, 129, 0.05) 0%, var(--bg-panel) 100%);
        }
        body[data-theme="channel-strip"] .mod-tool .module-header { 
            color: var(--mod-tool-color);
            background: linear-gradient(90deg, rgba(16, 185, 129, 0.15) 0%, transparent 100%);
        }

        /* Theme C: Matrix FX - Strong accent with background wash */
        body[data-theme="matrix-fx"] .mod-input {
            border: 1px solid rgba(245, 158, 11, 0.3);
            background: radial-gradient(circle at top left, rgba(245, 158, 11, 0.08), var(--bg-panel));
        }
        body[data-theme="matrix-fx"] .mod-input .module-header { 
            color: var(--mod-input-color);
            text-shadow: 0 0 8px rgba(245, 158, 11, 0.5);
        }
        body[data-theme="matrix-fx"] .mod-input:hover {
            border-color: var(--mod-input-color);
            box-shadow: 0 0 20px rgba(245, 158, 11, 0.3);
        }

        body[data-theme="matrix-fx"] .mod-db {
            border: 1px solid rgba(0, 243, 255, 0.3);
            background: radial-gradient(circle at top left, rgba(0, 243, 255, 0.08), var(--bg-panel));
        }
        body[data-theme="matrix-fx"] .mod-db .module-header { 
            color: var(--mod-db-color);
            text-shadow: 0 0 8px rgba(0, 243, 255, 0.5);
        }
        body[data-theme="matrix-fx"] .mod-db:hover {
            border-color: var(--mod-db-color);
            box-shadow: 0 0 20px rgba(0, 243, 255, 0.3);
        }

        body[data-theme="matrix-fx"] .mod-score {
            border: 1px solid var(--border-light);
        }
        body[data-theme="matrix-fx"] .mod-score .module-header { 
            color: var(--mod-score-color);
        }

        body[data-theme="matrix-fx"] .mod-prog {
            border: 1px solid rgba(217, 70, 239, 0.3);
            background: radial-gradient(circle at top left, rgba(217, 70, 239, 0.08), var(--bg-panel));
        }
        body[data-theme="matrix-fx"] .mod-prog .module-header { 
            color: var(--mod-prog-color);
            text-shadow: 0 0 8px rgba(217, 70, 239, 0.5);
        }
        body[data-theme="matrix-fx"] .mod-prog:hover {
            border-color: var(--mod-prog-color);
            box-shadow: 0 0 20px rgba(217, 70, 239, 0.3);
        }

        body[data-theme="matrix-fx"] .mod-solar {
            border: 1px solid rgba(6, 182, 212, 0.3);
            background: radial-gradient(circle at top left, rgba(6, 182, 212, 0.08), var(--bg-panel));
        }
        body[data-theme="matrix-fx"] .mod-solar .module-header { 
            color: var(--mod-solar-color);
            text-shadow: 0 0 8px rgba(6, 182, 212, 0.5);
        }
        body[data-theme="matrix-fx"] .mod-solar:hover {
            border-color: var(--mod-solar-color);
            box-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
        }

        body[data-theme="matrix-fx"] .mod-ref {
            border: 1px solid rgba(249, 115, 22, 0.3);
            background: radial-gradient(circle at top left, rgba(249, 115, 22, 0.08), var(--bg-panel));
        }
        body[data-theme="matrix-fx"] .mod-ref .module-header { 
            color: var(--mod-ref-color);
            text-shadow: 0 0 8px rgba(249, 115, 22, 0.5);
        }
        body[data-theme="matrix-fx"] .mod-ref:hover {
            border-color: var(--mod-ref-color);
            box-shadow: 0 0 20px rgba(249, 115, 22, 0.3);
        }

        body[data-theme="matrix-fx"] .mod-tool {
            border: 1px solid rgba(16, 185, 129, 0.3);
            background: radial-gradient(circle at top left, rgba(16, 185, 129, 0.08), var(--bg-panel));
        }
        body[data-theme="matrix-fx"] .mod-tool .module-header { 
            color: var(--mod-tool-color);
            text-shadow: 0 0 8px rgba(16, 185, 129, 0.5);
        }
        body[data-theme="matrix-fx"] .mod-tool:hover {
            border-color: var(--mod-tool-color);
            box-shadow: 0 0 20px rgba(16, 185, 129, 0.3);
        }

        .module-content {
            padding: 10px;
            overflow: visible;
            background: transparent;
            display: flex;
            flex-direction: column;
        }
        
        /* Specific Module Tweaks */
        #sheet-music-container {
            background: #e0e0e0;
            border: 2px solid var(--border-light);
            min-height: 180px;
            max-height: none;
            display: flex;
            justify-content: center;
            padding: 20px;
            filter: invert(1) hue-rotate(180deg);
        }
        
        #chord-explorer-container {
            overflow: visible;
            display: flex;
            flex-direction: column;
            width: 100%;
        }

        /* ==================== PROGRESSION BUILDER STYLES ==================== */
        .progression-builder-ui {
            display: flex;
            flex-direction: column;
            gap: 8px;
            font-family: var(--font-ui);
        }
        
        .pb-top {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: flex-start;
        }
        
        .pb-left {
            flex: 1;
            min-width: 300px;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        
        .pb-input {
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            padding: 8px;
            border-radius: var(--radius-sm);
        }
        
        .pb-input-numbers {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            min-height: 32px;
            align-items: center;
        }
        
        .pb-chip {
            background: var(--accent-primary);
            color: #000;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
            font-size: 0.85rem;
            font-weight: 600;
            font-family: var(--font-tech);
        }
        
        .pb-hint {
            color: var(--text-muted);
            font-size: 0.85rem;
            font-style: italic;
        }
        
        .pb-keyscale {
            margin-top: 6px;
            color: var(--accent-secondary);
            font-size: 0.8rem;
            font-family: var(--font-tech);
        }
        
        .pb-controls {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        
        .pg-target {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            align-items: center;
        }
        
        .pg-degree-list {
            display: flex;
            flex-wrap: wrap;
            gap: 4px;
        }
        
        .pg-degree-btn {
            font-size: 0.75rem;
            padding: 4px 8px !important;
        }
        
        .pb-explore {
            display: flex;
            gap: 8px;
            align-items: center;
            flex-wrap: wrap;
        }
        
        .pb-label {
            font-size: 0.85rem;
            color: var(--text-main);
            font-family: var(--font-tech);
        }
        
        .pb-select {
            flex: 1;
            min-width: 150px;
        }
        
        .pb-regenerate {
            white-space: nowrap;
        }
        
        .pb-pad {
            display: flex;
            flex-direction: column;
            gap: 8px;
            align-items: center;
            margin-top: 10px;
        }
        
        .pb-pad-wrap {
            position: relative;
            width: 180px;
            height: 180px;
            margin: 12px 20px;
        }
        
        .pb-axis-label {
            position: absolute;
            font-size: 0.65rem;
            font-weight: 600;
            color: var(--text-muted);
            text-transform: uppercase;
            font-family: var(--font-tech);
            letter-spacing: 1px;
            white-space: nowrap;
        }
        
        .pb-axis-top { top: -20px; left: 50%; transform: translateX(-50%); }
        .pb-axis-bottom { bottom: -20px; left: 50%; transform: translateX(-50%); }
        .pb-axis-left { left: -35px; top: 50%; transform: translateY(-50%) rotate(-90deg); }
        .pb-axis-right { right: -35px; top: 50%; transform: translateY(-50%) rotate(90deg); }
        
        .pb-axis-badge {
            font-size: 0.6rem;
            margin-left: 3px;
        }
        
        .pb-axis-sub {
            font-size: 0.6rem;
            display: block;
            margin-top: 2px;
        }
        
        .pb-pad-surface {
            width: 100%;
            height: 100%;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            position: relative;
            cursor: crosshair;
            overflow: hidden;
        }
        
        .pb-status {
            display: flex;
            gap: 8px;
            width: 100%;
            justify-content: center;
        }

        .pb-card {
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 4px;
            padding: 6px 10px;
            text-align: center;
            flex: 1;
            min-width: 80px;
        }
        
        .pb-card-label {
            font-size: 0.7rem;
            color: var(--text-muted);
            text-transform: uppercase;
            margin-bottom: 4px;
            font-family: var(--font-tech);
        }
        
        .pb-card-value {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 2px;
        }
        
        .pb-card-sub {
            font-size: 0.7rem;
            color: var(--text-muted);
        }

        .pb-chord-explanation {
            font-size: 0.7rem;
            color: var(--text-secondary);
            margin-bottom: 2px;
            line-height: 1.2;
        }

        .pb-chord-degree {
            font-size: 0.65rem;
            color: var(--text-muted);
            text-align: center;
        }

        .pb-progression-controls {
            display: flex;
            gap: 8px;
            justify-content: center;
            margin-top: 8px;
        }

        .pb-suggest-alternatives,
        .pb-show-analysis {
            font-size: 0.8rem;
            padding: 6px 12px;
        }
        
        .pb-sub-panel {
            margin-top: 12px;
            padding: 12px;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
        }
        
        .pb-sub-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 8px;
        }

        .pb-progression-display {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 12px;
            padding: 10px;
            background: rgba(0,0,0,0.2);
            border-radius: 4px;
        }

        .pb-chord-item {
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            border-radius: 4px;
            padding: 8px;
            min-width: 120px;
            flex: 1 1 120px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .pb-chord-main {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-left: 8px;
            margin-bottom: 4px;
        }

        .pb-chord-name {
            font-weight: 700;
            font-size: 1.1rem;
            color: var(--text-main);
        }

        .pb-chord-grade {
            font-size: 0.7rem;
            font-weight: 600;
        }

        /* Mini Chord Strip */
        .mini-chord-strip {
            display: flex;
            gap: 8px;
            padding: 8px 12px;
            overflow-x: auto;
            overflow-y: hidden;
            flex-wrap: nowrap;
            background: rgba(0,0,0,0.3);
            border-bottom: 1px solid var(--border-light);
            min-height: 50px;
            align-items: center;
        }

        /* Piano overrides */
        #piano-container {
            height: auto;
            min-height: auto;
            width: 100%;
            overflow-x: auto;
            overflow-y: visible;
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
            align-items: flex-start;
            padding: 10px 6px 0 6px;
            background: 
                radial-gradient(ellipse at center top, rgba(0, 243, 255, 0.03) 0%, transparent 50%),
                linear-gradient(180deg, rgba(0,0,0,0.5) 0%, #000000 100%);
            position: relative;
        }
        
        /* Add subtle grid pattern to piano container */
        #piano-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-image: 
                linear-gradient(rgba(255,255,255,0.01) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255,255,255,0.01) 1px, transparent 1px);
            background-size: 20px 20px;
            pointer-events: none;
            opacity: 0.5;
        }

        /* ==================== RESPONSIVE & ECONOMIC SPACE ==================== */
        @media (max-width: 1200px) {
            .workspace {
                grid-template-columns: minmax(280px, var(--sidebar-left-width, 0.85fr)) 6px 1fr; 
            }
            .workspace-column.right-sidebar, #splitter-right {
                display: none; 
            }
        }

        @media (max-width: 900px) {
            body { overflow: auto; height: auto; display: block; }
            .workspace {
                display: flex;
                flex-direction: column;
                height: auto;
                overflow: visible;
                padding: 10px;
                gap: 10px;
            }
            .splitter { display: none; }
            .workspace-column {
                width: 100% !important;
                height: auto;
                overflow: visible;
                border: none;
            }
            .bottom-deck {
                position: sticky;
                bottom: 0;
                /* Keep the instrument dock usable on mobile */
                height: clamp(170px, 32vh, 360px);
                padding-bottom: 0;
            }
        }

        /* Economic Visualizer Patches */
        .guitar-fretboard {
            max-width: 100%;
            overflow-x: auto;
            scrollbar-width: thin;
        }
        
        #piano-container {
            max-width: 100%;
            overflow-x: hidden;
            scrollbar-width: thin;
        }

        /* Ensure columns don't collapse */
        .workspace-column {
            min-width: 0; /* Allow grid items to shrink below content size */
        }
        
        /* Utilities */
        .btn-icon { 
            background: transparent; 
            border: 1px solid transparent; 
            color: var(--text-muted); 
            cursor: pointer; 
            font-family: var(--font-tech);
            padding: 2px 6px;
        }
        .btn-icon:hover { 
            color: var(--accent-primary); 
            border-color: var(--accent-primary);
            background: rgba(0, 243, 255, 0.1);
        }
        
        /* Scrollbars */
        ::-webkit-scrollbar { width: 8px; height: 8px; }
        ::-webkit-scrollbar-track { background: #000; border-left: 1px solid var(--border-light); }
        ::-webkit-scrollbar-thumb { background: var(--border-light); border: 1px solid #000; }
        ::-webkit-scrollbar-thumb:hover { background: var(--accent-primary); }
        
        /* Global Button Styles for injected modules */
        button {
            font-family: var(--font-tech) !important;
            text-transform: uppercase;
            letter-spacing: 1px;
            border-radius: 0 !important; /* Square buttons */
        }
        
        .btn {
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            color: var(--text-main);
            padding: 8px 12px;
            cursor: pointer;
            font-size: 0.85rem;
            transition: all 0.2s ease;
        }
        
        .btn:hover {
            border-color: var(--accent-primary);
            background: rgba(0, 243, 255, 0.1);
            color: var(--accent-primary);
        }
        
        .btn-primary {
            background: var(--accent-primary);
            color: #000;
            border-color: var(--accent-primary);
        }
        
        .btn-primary:hover {
            background: var(--accent-secondary);
            border-color: var(--accent-secondary);
        }
        
        /* Input Styles */
        input, select {
            background: #000 !important;
            border: 1px solid var(--border-light) !important;
            color: var(--accent-primary) !important;
            font-family: var(--font-tech) !important;
            border-radius: 0 !important;
        }
        input:focus, select:focus {
            border-color: var(--accent-primary) !important;
            box-shadow: 0 0 8px var(--accent-glow) !important;
            outline: none;
        }
        
        /* ==================== SIMPLIFIED CONTROL DECK ==================== */
        .primary-input-section {
            border-left: 1px solid var(--border-light);
            padding-left: 16px;
        }
        
        .grading-section {
            border-left: 1px solid var(--border-light);
            padding-left: 12px;
        }
        
        .secondary-controls {
            border-left: 1px solid var(--border-light);
            padding-left: 12px;
        }
        
        /* ==================== DROPDOWN PANELS ==================== */
        .tools-dropdown-panel,
        #settings-dropdown-panel,
        #help-dropdown-panel {
            position: absolute;
            top: calc(100% + 4px);
            right: 0;
            background: var(--bg-panel);
            border: 1px solid var(--border-light);
            padding: 8px;
            min-width: 200px;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
            pointer-events: none;
            transition: all 0.2s ease;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.5);
        }
        
        .tools-dropdown-panel.open,
        #settings-dropdown-panel.open,
        #help-dropdown-panel.open {
            max-height: 400px;
            opacity: 1;
            pointer-events: auto;
        }
        
        .module-toggle-item {
            display: flex;
            align-items: center;
            padding: 6px 8px;
            margin-bottom: 4px;
            background: var(--bg-input);
            border: 1px solid var(--border-light);
            transition: all 0.2s ease;
        }
        
        .module-toggle-item:hover {
            border-color: var(--accent-primary);
            background: rgba(0, 243, 255, 0.05);
        }
        
        .module-toggle-item input[type="checkbox"] {
            margin-right: 8px;
            cursor: pointer;
            width: 16px;
            height: 16px;
            accent-color: var(--accent-primary);
        }
        
        .module-toggle-item label {
            cursor: pointer;
            flex: 1;
            font-size: 0.75rem;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            user-select: none;
        }
        
        .module-toggle-item:hover label {
            color: var(--accent-primary);
        }
        
        /* ==================== TUTORIAL SYSTEM ==================== */
        .tutorial-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.85);
            z-index: 9998;
            display: none;
            pointer-events: none;
        }
        
        .tutorial-overlay.active {
            display: block;
        }
        
        .tutorial-highlight {
            position: absolute;
            border: 3px solid var(--accent-primary);
            box-shadow: 0 0 20px var(--accent-primary), inset 0 0 20px rgba(0, 243, 255, 0.2);
            pointer-events: none;
            z-index: 9999;
            animation: pulse-highlight 2s infinite;
        }
        
        @keyframes pulse-highlight {
            0%, 100% { box-shadow: 0 0 20px var(--accent-primary), inset 0 0 20px rgba(0, 243, 255, 0.2); }
            50% { box-shadow: 0 0 40px var(--accent-primary), inset 0 0 40px rgba(0, 243, 255, 0.3); }
        }
        
        .tutorial-tooltip {
            position: fixed;
            background: var(--bg-panel);
            border: 2px solid var(--accent-primary);
            padding: 16px 20px;
            max-width: 400px;
            z-index: 10000;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.8);
            font-family: var(--font-ui);
            display: none;
        }
        
        .tutorial-tooltip.active {
            display: block;
        }
        
        .tutorial-tooltip-title {
            font-family: var(--font-tech);
            font-size: 0.9rem;
            color: var(--accent-primary);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 8px;
            border-bottom: 1px solid var(--border-light);
            padding-bottom: 6px;
        }
        
        .tutorial-tooltip-content {
            color: var(--text-main);
            font-size: 0.85rem;
            line-height: 1.5;
            margin-bottom: 12px;
        }
        
        .tutorial-tooltip-actions {
            display: flex;
            gap: 8px;
            justify-content: flex-end;
        }
        
        .tutorial-tooltip-actions button {
            padding: 6px 12px;
            font-size: 0.75rem;
        }
        
        /* Demo Mode Hover Tooltips */
        .demo-tooltip {
            position: absolute;
            background: var(--bg-panel);
            border: 1px solid var(--accent-primary);
            padding: 12px 16px;
            max-width: 300px;
            z-index: 10001;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.7);
            pointer-events: none;
            opacity: 0;
            transition: opacity 0.2s ease;
            font-family: var(--font-ui);
            font-size: 0.8rem;
            line-height: 1.4;
            color: var(--text-main);
        }
        
        .demo-tooltip.show {
            opacity: 1;
        }
        
        .demo-tooltip-title {
            font-family: var(--font-tech);
            font-size: 0.75rem;
            color: var(--accent-primary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
        }
        
        /* Easy Mode Indicator */
        .easy-mode-badge {
            position: fixed;
            top: 60px;
            right: 20px;
            background: var(--accent-secondary);
            color: #000;
            padding: 8px 16px;
            font-family: var(--font-tech);
            font-size: 0.75rem;
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 1px;
            z-index: 9997;
            box-shadow: 0 4px 12px rgba(52, 211, 153, 0.4);
            animation: badge-glow 2s infinite;
        }

        /* Input Mode Toggle Buttons */
        .input-mode-btn {
            background: var(--bg-lighter);
            border: 1px solid var(--border-main);
            color: var(--text-dim);
            padding: 6px 12px;
            font-size: 1.1rem;
            cursor: pointer;
            transition: all 0.2s ease;
            font-family: var(--font-ui);
        }
        
        .input-mode-btn:hover {
            background: var(--bg-panel);
            border-color: var(--accent-primary);
            color: var(--text-main);
        }
        
        .input-mode-btn.active {
            background: var(--accent-primary);
            border-color: var(--accent-primary);
            color: #000;
            font-weight: bold;
        }

        /* Word Analysis Panel */
        .word-analysis-panel {
            position: fixed;
            top: 80px;
            right: -350px;
            width: 340px;
            max-height: calc(100vh - 100px);
            background: var(--bg-panel);
            border: 1px solid var(--accent-primary);
            box-shadow: -4px 0 16px rgba(0, 0, 0, 0.7);
            z-index: 9000;
            transition: right 0.3s ease;
            display: flex;
            flex-direction: column;
        }
        
        .word-analysis-panel.active {
            right: 20px;
        }

        /* Word Settings Panel */
        .word-settings-panel {
            position: fixed;
            top: 80px;
            right: -350px;
            width: 340px;
            max-height: calc(100vh - 100px);
            background: var(--bg-panel);
            border: 1px solid var(--border-main);
            box-shadow: -4px 0 16px rgba(0, 0, 0, 0.7);
            z-index: 9000;
            transition: right 0.3s ease;
            display: flex;
            flex-direction: column;
        }
        
        .word-settings-panel.active {
            right: 20px;
        }

        .word-analysis-panel .panel-header,
        .word-settings-panel .panel-header {
            background: var(--bg-darker);
            border-bottom: 1px solid var(--border-light);
            padding: 12px 16px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-family: var(--font-tech);
            font-size: 0.85rem;
            color: var(--text-main);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .word-analysis-panel .panel-content,
        .word-settings-panel .panel-content {
            flex: 1;
            overflow-y: auto;
            padding: 16px;
        }

        .analysis-empty {
            color: var(--text-dim);
            font-style: italic;
            text-align: center;
            padding: 24px;
        }

        .analysis-section {
            margin-bottom: 16px;
            padding: 12px;
            background: var(--bg-lighter);
            border: 1px solid var(--border-main);
        }

        .analysis-section-title {
            font-family: var(--font-tech);
            font-size: 0.75rem;
            color: var(--accent-primary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 8px;
        }

        .analysis-item {
            display: flex;
            justify-content: space-between;
            padding: 4px 0;
            font-size: 0.85rem;
        }

        .analysis-item-label {
            color: var(--text-dim);
        }

        .analysis-item-value {
            color: var(--text-main);
            font-weight: bold;
        }

        .archetype-match {
            background: var(--bg-darker);
            border: 1px solid var(--accent-secondary);
            padding: 8px;
            margin-top: 8px;
        }

        .archetype-match-title {
            color: var(--accent-secondary);
            font-weight: bold;
            margin-bottom: 4px;
        }

        .archetype-match-confidence {
            color: var(--text-dim);
            font-size: 0.8rem;
        }

        /* Settings Panel Specific */
        .setting-group {
            margin-bottom: 20px;
        }

        .setting-group label {
            display: block;
            font-size: 0.85rem;
            color: var(--text-main);
            margin-bottom: 8px;
            font-family: var(--font-tech);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            font-size: 0.75rem;
        }

        .weight-slider {
            width: 100%;
            height: 6px;
            background: var(--bg-lighter);
            border: 1px solid var(--border-main);
            outline: none;
            cursor: pointer;
            -webkit-appearance: none;
            appearance: none;
        }

        .weight-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 16px;
            height: 16px;
            background: var(--accent-primary);
            cursor: pointer;
            border-radius: 50%;
        }

        .weight-slider::-moz-range-thumb {
            width: 16px;
            height: 16px;
            background: var(--accent-primary);
            cursor: pointer;
            border-radius: 50%;
            border: none;
        }

        .weight-value {
            display: inline-block;
            margin-left: 8px;
            color: var(--accent-primary);
            font-weight: bold;
            min-width: 40px;
        }

        #reset-weights-btn {
            width: 100%;
            margin-top: 8px;
        }

        
        @keyframes badge-glow {
            0%, 100% { box-shadow: 0 4px 12px rgba(52, 211, 153, 0.4); }
            50% { box-shadow: 0 4px 20px rgba(52, 211, 153, 0.7); }
        }
        
        .demo-mode-badge {
            position: fixed;
            top: 100px;
            right: 20px;
            background: var(--accent-primary);
            color: #000;
            padding: 8px 16px;
            font-family: var(--font-tech);
            font-size: 0.75rem;
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 1px;
            z-index: 9997;
            box-shadow: 0 4px 12px rgba(96, 165, 250, 0.4);
        }
        
        /* Tutorial Step Counter */
        .tutorial-progress {
            position: fixed;
            top: 60px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--bg-panel);
            border: 1px solid var(--accent-primary);
            padding: 8px 20px;
            font-family: var(--font-tech);
            font-size: 0.75rem;
            color: var(--accent-primary);
            text-transform: uppercase;
            letter-spacing: 1px;
            z-index: 9997;
            display: none;
        }
        
        .tutorial-progress.active {
            display: block;
        }