.studio-wrap {
            display: flex;
            flex-direction: column;
            gap: 16px;
            height: 100%;
        }

        .scene-panel {
            position: relative;
            border-radius: var(--r-lg, 20px);
            overflow: hidden;
            background: radial-gradient(ellipse at 50% 20%, #1d2438 0%, #0b0e17 70%);
            border: 1px solid var(--border);
            min-height: 420px;
            flex: 1;
        }

        #three-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;
        }

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

        .chord-flash {
            font-size: clamp(2.2rem, 7vw, 4.2rem);
            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);
        }

        .chord-meta-pill {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: var(--text-xs);
            background: rgba(10, 13, 22, 0.65);
            backdrop-filter: blur(10px);
            padding: 5px 12px;
            border-radius: 99px;
            border: 1px solid rgba(255, 255, 255, 0.12);
            width: fit-content;
        }

        .chord-notes {
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.05em;
        }

        .chord-anchor-tip {
            color: var(--warning-text);
            font-weight: 600;
            font-size: 11px;
        }

        .hud-controls-top {
            display: flex;
            flex-direction: column;
            align-items: flex-end;
            gap: 8px;
        }

        .cam-presets-bar {
            display: flex;
            gap: 4px;
            background: rgba(10, 13, 22, 0.65);
            backdrop-filter: blur(10px);
            padding: 3px 5px;
            border-radius: 99px;
            border: 1px solid rgba(255, 255, 255, 0.12);
            pointer-events: auto;
        }

        .btn-cam {
            background: transparent;
            border: none;
            color: var(--text-muted);
            font-size: 12px;
            font-weight: 600;
            padding: 5px 10px;
            border-radius: 99px;
            cursor: pointer;
            transition: all .18s ease;
        }

        .btn-cam:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.08);
        }

        .btn-cam.active {
            background: var(--accent-fill);
            color: #ffffff;
            box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
        }

        .btn-cam:focus-visible {
            outline: 2px solid var(--border-focus);
            outline-offset: 2px;
        }

        .hud-hint {
            font-size: 12px;
            color: var(--text-secondary);
            background: rgba(10, 13, 22, 0.75);
            backdrop-filter: blur(6px);
            padding: 5px 10px;
            border-radius: 999px;
            border: 1px solid var(--border);
        }

        .hud-bottom-bar {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            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: var(--accent-fill);
            color: #ffffff;
            border: none;
            font-size: var(--text-xs);
            font-weight: 700;
            padding: 7px 16px;
            border-radius: 99px;
            cursor: pointer;
            box-shadow: 0 2px 10px rgba(99, 102, 241, 0.35);
            transition: transform .15s ease, background .15s ease;
        }

        .btn-hud-strum:hover {
            transform: scale(1.04);
            background: var(--accent);
        }

        .btn-hud-strum:active {
            transform: scale(0.96);
        }

        .btn-hud-strum [data-icon] svg {
            width: 1.1em;
            height: 1.1em;
        }

        .hud-pluck-hint {
            font-size: 11px;
            color: rgba(255, 255, 255, 0.5);
            background: rgba(10, 13, 22, 0.5);
            backdrop-filter: blur(6px);
            padding: 4px 9px;
            border-radius: 99px;
        }

        .hud-beat {
            align-self: flex-end;
            display: flex;
            gap: 8px;
        }

        .beat-dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.15);
            transition: background .1s, transform .1s, box-shadow .1s;
        }

        .beat-dot.on {
            background: var(--accent-fill, #4f46e5);
            transform: scale(1.35);
            box-shadow: 0 0 12px var(--accent, #6366f1);
        }

        .ug-strip {
            display: flex;
            gap: 10px;
            overflow-x: auto;
            padding: 4px 2px 8px;
            scrollbar-width: thin;
        }

        .ug-chip {
            flex: 0 0 auto;
            min-width: 84px;
            text-align: center;
            padding: 10px 14px;
            border-radius: var(--r-md, 14px);
            background: var(--bg-elevated);
            border: 2px solid var(--border);
            cursor: pointer;
            transition: border-color .15s, transform .15s, box-shadow .15s;
            user-select: none;
        }

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

        .ug-chip .chip-sub {
            font-size: 11px;
            color: var(--text-muted, #8a93a8);
        }

        .ug-chip.active {
            border-color: var(--accent, #6366f1);
            box-shadow: 0 0 16px rgba(99, 102, 241, 0.35);
            transform: translateY(-3px);
        }

        .ug-chip .chip-remove {
            position: absolute;
            display: none;
        }

        .controls-card {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            align-items: center;
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: var(--r-md, 14px);
            padding: 12px 14px;
        }

        .controls-card label {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted, #8a93a8);
        }

        .controls-card select,
        .controls-card input[type="range"] {
            accent-color: var(--accent, #6366f1);
        }

        .controls-card select {
            background: var(--bg-surface);
            color: var(--text-primary);
            border: 1px solid var(--border);
            border-radius: var(--r-sm, 10px);
            padding: 7px 10px;
        }

        .bpm-val {
            min-width: 52px;
            font-family: 'JetBrains Mono', monospace;
            color: var(--text-primary);
            font-size: 13px;
        }

        .chord-picker {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .picker-btn {
            padding: 7px 13px;
            border-radius: var(--r-full, 999px);
            border: 1px solid var(--border);
            background: var(--bg-surface);
            color: var(--text-primary);
            font-weight: 700;
            font-size: 13px;
            cursor: pointer;
            transition: background .12s, border-color .12s, transform .12s;
        }

        .picker-btn:hover {
            border-color: var(--accent, #6366f1);
            transform: translateY(-1px);
        }

        .btn-icon-round {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            border: none;
            font-size: 19px;
            cursor: pointer;
            background: var(--accent-fill, #4f46e5);
            color: #fff;
            display: grid;
            place-items: center;
            box-shadow: 0 4px 14px var(--accent-glow, rgba(99, 102, 241, 0.4));
            transition: transform .12s;
        }

        .btn-icon-round:active {
            transform: scale(0.93);
        }

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

        .picker-label {
            font-size: 13px;
            color: var(--text-muted, #8a93a8);
            font-weight: 700;
        }

        .strip-empty {
            color: var(--text-muted, #8a93a8);
            font-size: 14px;
            padding: 10px 4px;
        }

        .viz-help {
            background: var(--bg-elevated);
            border: 1px solid var(--border);
            border-radius: var(--r-md, 14px);
            padding: 10px 14px;
            font-size: 14px;
            color: var(--text-muted, #8a93a8);
        }

        .viz-help summary {
            cursor: pointer;
            font-weight: 700;
            color: var(--text-primary);
        }

        .viz-help p {
            margin: 10px 0 4px;
            line-height: 1.55;
        }

        @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;
            }
        }

        .hud-step-pill {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: var(--text-xs);
            background: rgba(10, 13, 22, 0.75);
            backdrop-filter: blur(10px);
            padding: 4px 10px;
            border-radius: 99px;
            border: 1px solid rgba(99, 102, 241, 0.35);
            box-shadow: 0 0 10px rgba(99, 102, 241, 0.15);
            width: fit-content;
        }

        .hud-step-pill .step-num {
            background: var(--accent-fill);
            color: #ffffff;
            font-weight: 800;
            font-size: 11px;
            padding: 2px 7px;
            border-radius: 99px;
        }

        .hud-step-pill .step-current {
            font-weight: 800;
            color: var(--text-primary);
            font-size: 13px;
        }

        .hud-step-pill .step-next {
            color: var(--text-muted);
            font-weight: 600;
            font-size: 11px;
        }

        .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: 99px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            width: fit-content;
        }

        .ug-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;
        }

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

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

        .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);
        }

        /* ── Progressive Voicing Tiers & Acoustic Mic ── */
        .btn-tier {
            padding: 4px 8px;
            font-size: 11px;
            font-weight: 600;
            border-radius: var(--r-full, 999px);
            background: rgba(15, 23, 42, 0.7);
            color: var(--text-secondary);
            border: 1px solid rgba(255, 255, 255, 0.12);
            cursor: pointer;
            transition: all 0.15s ease;
        }
        .btn-tier.active {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .btn-acoustic-mic {
            padding: 4px 10px;
            font-size: 11px;
            font-weight: 700;
            border-radius: var(--r-full, 999px);
            background: rgba(245, 158, 11, 0.15);
            color: var(--warning-text);
            border: 1px solid var(--warning, #f59e0b);
            cursor: pointer;
            transition: all 0.15s ease;
        }
        .btn-acoustic-mic.active {
            background: var(--success);
            color: var(--on-success, #000000);
            border-color: var(--success);
        }
        .scene-diagnostic-toast {
            position: absolute;
            top: 70px;
            left: 16px;
            max-width: 340px;
            padding: 8px 14px;
            border-radius: var(--r-md, 8px);
            background: rgba(15, 23, 42, 0.92);
            border: 1px solid var(--warning);
            color: var(--text-primary);
            font-size: 12px;
            font-weight: 600;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
            z-index: 10;
        }
        .scene-diagnostic-toast.dead {
            border-color: var(--error);
            color: var(--error-text);
        }
        .scene-diagnostic-toast.buzz {
            border-color: var(--warning);
            color: var(--warning-text);
        }
        .scene-diagnostic-toast.clean {
            border-color: var(--success);
            color: var(--success-text);
        }