.studio-layout {
            display: grid;
            grid-template-columns: 1fr 340px;
            gap: 16px;
            align-items: start;
            margin-top: 16px;
        }

        @media (max-width: 1024px) {
            .studio-layout {
                grid-template-columns: 1fr;
            }
        }

        .scene-panel {
            position: relative;
            border-radius: var(--r-lg);
            overflow: hidden;
            background: radial-gradient(ellipse at 50% 20%, #1d2438 0%, #0b0e17 70%);
            border: 1px solid var(--border);
            min-height: 380px;
        }

        #studio-canvas {
            display: block;
            width: 100%;
            height: 100%;
            touch-action: pan-y;
        }

        .scene-hud {
            position: absolute;
            inset: 0;
            pointer-events: none;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            padding: 14px 16px;
        }

        .hud-top {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            gap: 12px;
        }

        .chord-flash {
            font-size: clamp(1.8rem, 5vw, 3.2rem);
            font-weight: 800;
            color: #fff;
            text-shadow: 0 0 24px rgba(99, 102, 241, 0.9), 0 4px 18px rgba(0, 0, 0, 0.6);
            opacity: 0;
            transform: translateY(8px) scale(0.92);
            transition: opacity .18s ease, transform .18s ease;
            line-height: 1;
        }

        .chord-flash.show {
            opacity: 1;
            transform: translateY(0) scale(1);
        }

        .hud-hint {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.55);
            background: rgba(10, 13, 22, 0.55);
            backdrop-filter: blur(6px);
            padding: 6px 10px;
            border-radius: var(--r-full);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .hud-chord-info {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .hud-controls-top {
            display: flex;
            flex-direction: column;
            align-items: flex-end;
            gap: 6px;
        }

        .cam-presets-bar {
            display: inline-flex;
            gap: 4px;
            background: rgba(10, 14, 26, 0.75);
            backdrop-filter: blur(12px);
            padding: 4px;
            border-radius: var(--r-full);
            border: 1px solid rgba(255, 255, 255, 0.12);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
            pointer-events: auto;
        }

        .btn-cam {
            background: transparent;
            border: none;
            color: var(--text-primary);
            font-size: 11px;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: var(--r-full);
            cursor: pointer;
            transition: all 0.15s ease;
            white-space: nowrap;
        }

        .btn-cam:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
        }

        .btn-cam.active {
            background: var(--accent-fill);
            color: #fff;
            box-shadow: 0 0 8px var(--accent-glow);
        }

        .btn-cam.btn-mirror-toggle.active {
            background: var(--warning, #f59e0b);
            color: #0b0e17;
            font-weight: 700;
        }

        .chord-meta-pill {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(10, 14, 26, 0.75);
            backdrop-filter: blur(12px);
            padding: 4px 10px;
            border-radius: var(--r-full);
            border: 1px solid rgba(255, 255, 255, 0.12);
            font-size: 11px;
            font-weight: 600;
            pointer-events: auto;
        }

        .hud-step-pill {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(10, 14, 26, 0.75);
            backdrop-filter: blur(12px);
            padding: 4px 10px;
            border-radius: var(--r-full);
            border: 1px solid rgba(255, 255, 255, 0.12);
            font-size: 11px;
            font-weight: 600;
            pointer-events: auto;
            width: fit-content;
        }

        .hud-step-pill .step-num {
            color: var(--text-muted);
        }

        .hud-step-pill .step-current {
            color: #fff;
            font-weight: 800;
        }

        .hud-step-pill .step-next {
            color: var(--text-muted);
            font-size: 10px;
        }

        .hud-orientation-pill {
            font-size: 11px;
            color: var(--text-secondary);
            background: rgba(10, 13, 22, 0.65);
            backdrop-filter: blur(8px);
            padding: 4px 10px;
            border-radius: var(--r-full);
            border: 1px solid rgba(255, 255, 255, 0.1);
            width: fit-content;
        }

        .chord-notes {
            color: var(--text-primary);
            letter-spacing: 0.05em;
        }

        .chord-anchor-tip {
            display: none;
            color: var(--warning-text);
            font-weight: 700;
        }

        .chord-anchor-tip.has-anchor {
            display: inline-block;
        }

        .hud-bottom-bar {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            gap: 12px;
            width: 100%;
        }

        .hud-strum-controls {
            display: flex;
            align-items: center;
            gap: 10px;
            pointer-events: auto;
        }

        .btn-hud-strum {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(99, 102, 241, 0.85);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.2);
            padding: 6px 14px;
            border-radius: var(--r-full);
            font-size: 12px;
            font-weight: 700;
            cursor: pointer;
            backdrop-filter: blur(8px);
            box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
            transition: all 0.15s ease;
        }

        .btn-hud-strum:hover {
            background: var(--accent-fill);
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(99, 102, 241, 0.6);
        }

        .hud-pluck-hint {
            font-size: 11px;
            color: rgba(255, 255, 255, 0.65);
            font-style: italic;
        }

        .hud-bottom {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            gap: 12px;
        }

        .upcoming-chord {
            font-size: var(--text-lg);
            font-weight: 700;
            color: #4ade80;
            background: rgba(10, 13, 22, 0.6);
            padding: 6px 12px;
            border-radius: var(--r-full);
            border: 1px solid rgba(74, 222, 128, 0.3);
            opacity: 0;
            transition: opacity .3s;
        }

        .upcoming-chord.show {
            opacity: 1;
        }

        .beat-dots {
            display: flex;
            gap: 6px;
        }

        .beat-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.15);
            transition: background .1s, transform .1s;
        }

        .beat-dot.on {
            background: var(--accent-fill);
            transform: scale(1.35);
            box-shadow: 0 0 12px var(--accent);
        }

        .side-panel {
            display: flex;
            flex-direction: column;
            gap: 12px;
            min-width: 0;
        }

        .phase-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--r-md);
            padding: 14px;
        }

        .phase-title {
            font-size: var(--text-sm);
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--text-accent);
            margin-bottom: 4px;
        }

        .phase-instruction {
            font-size: var(--text-md);
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 8px;
        }

        .phase-action {
            font-size: var(--text-sm);
            color: var(--text-secondary);
        }

        .controls-card {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            align-items: center;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--r-md);
            padding: 12px;
        }

        .controls-card label {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            color: var(--text-secondary);
        }

        .controls-card select,
        .controls-card input[type="range"] {
            accent-color: var(--accent);
        }

        .controls-card select {
            background: var(--bg-surface);
            color: var(--text-primary);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 6px 10px;
        }

        .btn-studio {
            padding: 8px 16px;
            border-radius: var(--r-full);
            border: 1px solid var(--border);
            background: var(--bg-surface);
            color: var(--text-primary);
            font-weight: 600;
            font-size: 13px;
            cursor: pointer;
            transition: all .15s;
        }

        .btn-studio:hover {
            border-color: var(--accent);
            transform: translateY(-1px);
        }

        .btn-studio.primary {
            background: var(--accent-fill);
            color: #fff;
            border-color: var(--accent);
        }

        .btn-studio.success {
            background: var(--success);
            color: var(--on-success);
            border-color: var(--success);
        }

        .btn-studio:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }

        .feedback-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--r-md);
            padding: 14px;
            min-height: 80px;
        }

        .feedback-icon {
            font-size: var(--text-2xl);
            margin-bottom: 6px;
        }

        .feedback-title {
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 4px;
        }

        .feedback-text {
            font-size: var(--text-base);
            color: var(--text-secondary);
        }

        .progress-bar {
            height: 6px;
            background: var(--bg-elevated);
            border-radius: var(--r-full);
            overflow: hidden;
            margin-top: 10px;
        }

        .progress-fill {
            height: 100%;
            background: var(--accent-fill);
            border-radius: var(--r-full);
            transition: width .3s ease;
        }

        .chord-strip {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            padding: 4px 0 0;
        }

        .chord-chip {
            flex: 0 0 auto;
            min-width: 70px;
            text-align: center;
            padding: 8px 12px;
            border-radius: 12px;
            background: var(--bg-card);
            border: 2px solid var(--border);
            cursor: pointer;
            transition: all .15s;
            user-select: none;
        }

        .chord-chip,
        .library-chord {
            font: inherit;
            color: var(--text-primary);
        }

        .chord-chip.active {
            border-color: var(--accent);
            box-shadow: 0 0 16px var(--accent-glow);
            transform: translateY(-2px);
        }

        .chord-chip .chip-step-badge {
            display: inline-block;
            font-size: 10px;
            font-weight: 700;
            color: var(--text-muted);
            background: rgba(255, 255, 255, 0.08);
            padding: 2px 6px;
            border-radius: 99px;
            margin-bottom: 4px;
        }

        .chord-chip.active .chip-step-badge {
            background: var(--accent-fill);
            color: #ffffff;
        }

        .chord-chip .chip-name {
            font-size: var(--text-lg);
            font-weight: 800;
            color: var(--text-primary);
        }

        .chord-chip .chip-sub {
            font-size: 10px;
            color: var(--text-muted);
        }

        .assistance-badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 11px;
            font-weight: 700;
            padding: 3px 8px;
            border-radius: var(--r-full);
            background: var(--accent-soft);
            color: var(--text-accent);
        }

        .webgl-fallback {
            position: absolute;
            inset: 0;
            display: none;
            place-items: center;
            color: var(--text-muted);
            text-align: center;
            padding: 24px;
        }

        .webgl-fallback a { color: var(--text-accent); font-weight: 600; }

        .scene-loading {
            position: absolute;
            inset: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 12px;
            color: var(--text-muted);
            background: rgba(10, 13, 22, 0.85);
            z-index: 10;
            transition: opacity .3s;
        }

        .scene-loading.hidden {
            opacity: 0;
            pointer-events: none;
        }

        .scene-spinner {
            width: 36px;
            height: 36px;
            border: 3px solid rgba(255, 255, 255, 0.1);
            border-top-color: var(--accent);
            border-radius: 50%;
            animation: spin .8s linear infinite;
        }

        @keyframes spin {
            to { transform: rotate(360deg); }
        }

        .studio-error {
            position: absolute;
            inset: 0;
            display: none;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 12px;
            color: var(--text-secondary);
            background: rgba(10, 13, 22, 0.9);
            z-index: 20;
            text-align: center;
            padding: 24px;
        }

        .studio-error.show {
            display: flex;
        }

        @media (max-width: 640px) {
            .scene-panel {
                min-height: 280px;
            }
            .cam-presets-bar {
                max-width: 100%;
                overflow-x: auto;
                scrollbar-width: none;
            }
            .cam-presets-bar::-webkit-scrollbar {
                display: none;
            }
            .hud-bottom-bar {
                flex-wrap: wrap;
                gap: 8px;
            }
            .btn-hud-strum {
                min-height: 38px;
                padding: 6px 16px;
                font-size: 13px;
            }
            .hud-pluck-hint {
                font-size: 11px;
                white-space: nowrap;
            }
        }

        .studio-card,
        .progression-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--r-md);
            padding: 16px;
        }

        .chord-library-card {
            margin-top: 16px;
        }

        .studio-card-heading h2,
        .progression-card h2 {
            margin: 0 0 4px;
            font-size: var(--text-lg);
            color: var(--text-primary);
        }

        .studio-card-heading p {
            margin: 0;
            color: var(--text-secondary);
            font-size: var(--text-sm);
        }

        .chord-library {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            align-content: start;
        }

        .chord-library-layout {
            display: grid;
            grid-template-columns: minmax(180px, 0.8fr) minmax(300px, 1.2fr);
            gap: 18px;
            margin-top: 14px;
        }

        .library-chord-preview {
            display: grid;
            grid-template-columns: minmax(130px, 190px) minmax(0, 1fr);
            align-items: center;
            gap: 14px;
            min-width: 0;
            padding: 12px;
            border: 1px solid var(--border);
            border-radius: var(--r-md);
            background: var(--bg-surface);
        }

        .library-chord-preview #library-chord-diagram svg {
            display: block;
            width: min(100%, 180px);
            height: auto;
            margin-inline: auto;
        }

        .library-chord-preview ul {
            margin: 4px 0 10px;
            padding-left: 18px;
            color: var(--text-secondary);
            font-size: var(--text-sm);
        }

        .practice-tip-heading {
            margin: 0;
            color: var(--text-primary);
            font-size: var(--text-sm);
        }

        .practice-mic-note,
        #practice-timing {
            display: block;
            margin: 8px 0 0;
            color: var(--text-secondary);
            font-size: var(--text-sm);
        }

        .library-chord {
            min-width: 54px;
            padding: 8px 13px;
            border: 1px solid var(--border);
            border-radius: var(--r-full);
            background: var(--bg-surface);
            font-weight: 700;
            cursor: pointer;
        }

        .library-chord:hover,
        .library-chord.active {
            border-color: var(--accent);
            background: var(--accent-soft);
        }

        .progression-card h2 {
            font-size: var(--text-md);
        }

        .chord-chip {
            appearance: none;
        }

        .guided-practice {
            margin-top: 18px;
        }

        .practice-controls {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px 12px;
            margin: 14px 0;
            color: var(--text-secondary);
            font-size: var(--text-sm);
        }

        .practice-controls select {
            min-width: min(100%, 220px);
            padding: 7px 10px;
            border: 1px solid var(--border);
            border-radius: 8px;
            background: var(--bg-surface);
            color: var(--text-primary);
        }

        .practice-controls input {
            accent-color: var(--accent);
        }

        .elastic-toggle {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 13px;
            font-weight: 600;
            color: var(--text-accent);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: var(--r-sm);
            background: rgba(99, 102, 241, 0.08);
            border: 1px solid var(--border);
        }

        .practice-goal {
            margin-left: auto;
            font-weight: 700;
            color: var(--text-accent);
        }

        .practice-workspace {
            display: grid;
            grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
            gap: 18px;
        }

        .practice-chord-preview {
            padding: 14px;
            text-align: center;
            background: var(--bg-surface);
            border: 1px solid var(--border);
            border-radius: var(--r-md);
        }

        .practice-step-label {
            color: var(--text-secondary);
            font-size: var(--text-sm);
        }

        .practice-chord-name {
            color: var(--text-primary);
            font-size: var(--text-2xl);
            font-weight: 800;
        }

        .practice-diagram svg {
            display: block;
            width: min(100%, 190px);
            height: auto;
            margin: 4px auto 0;
        }

        .practice-instruction {
            margin: 0 0 6px;
            color: var(--text-primary);
            font-weight: 700;
        }

        .practice-detail {
            margin: 0 0 10px;
            color: var(--text-secondary);
            font-size: var(--text-sm);
        }

        .practice-guidance h3 {
            margin: 10px 0 4px;
            color: var(--text-primary);
            font-size: var(--text-sm);
        }

        .practice-guidance ul {
            margin: 0;
            padding-left: 20px;
            color: var(--text-secondary);
            font-size: var(--text-sm);
        }

        .practice-progress {
            max-width: 340px;
            margin-top: 12px;
            color: var(--text-secondary);
            font-size: var(--text-sm);
        }

        .practice-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 12px;
        }

        @media (max-width: 640px) {
            .practice-workspace {
                grid-template-columns: 1fr;
            }

            .chord-library-layout,
            .library-chord-preview {
                grid-template-columns: 1fr;
            }

            .practice-chord-preview {
                max-width: 260px;
                width: 100%;
                margin-inline: auto;
            }

            .practice-goal {
                width: 100%;
                margin-left: 0;
            }
        }

        .studio-error-icon { font-size: var(--text-3xl); }
        #btn-first10 { width: 100%; justify-content: center; font-size: 14px; padding: 12px; }

        .studio-quick-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 16px;
            align-items: center;
        }

        .quick-nav-pill {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 12px;
            font-size: 12px;
            font-weight: 600;
            color: var(--text-secondary);
            background: var(--bg-surface);
            border: 1px solid var(--border);
            border-radius: var(--r-full);
            text-decoration: none;
            transition: all 0.15s ease;
        }

        .quick-nav-pill:hover,
        .quick-nav-pill:focus-visible {
            color: var(--text-accent);
            border-color: var(--text-accent);
            background: var(--bg-hover);
            transform: translateY(-1px);
        }