/* Final button hierarchy and mobile polish */
        #btn-copy-all.tool-btn.copy-action-button {
            background: linear-gradient(135deg, rgba(111, 211, 232, 0.20), rgba(124, 224, 168, 0.16)) !important;
            color: #f4fbff !important;
            border: 1px solid rgba(111, 211, 232, 0.38) !important;
            box-shadow: 0 14px 34px rgba(0,0,0,0.24), inset 0 0 0 1px rgba(255,255,255,0.035) !important;
            justify-content: center !important;
            min-height: 42px !important;
            letter-spacing: 0.01em;
        }
        #btn-copy-all.tool-btn.copy-action-button svg { color: #bff4ff !important; }
        #btn-copy-all.tool-btn.copy-action-button:hover,
        #btn-copy-all.tool-btn.copy-action-button:focus-visible {
            background: linear-gradient(135deg, rgba(111, 211, 232, 0.28), rgba(124, 224, 168, 0.22)) !important;
            border-color: rgba(124, 224, 168, 0.48) !important;
            color: #ffffff !important;
            transform: translateY(-1px);
        }
        #btn-copy-all.copy-done {
            color: #eafff2 !important;
            background: linear-gradient(135deg, rgba(124,224,168,0.22), rgba(111,211,232,0.16)) !important;
        }
        #btn-copy-all.is-copying {
            color: #ffe8ad !important;
            background: linear-gradient(135deg, rgba(255,211,111,0.20), rgba(111,211,232,0.12)) !important;
        }

        #add-roi.tool-btn,
        #align-roi.tool-btn,
        #apply-roi-all.tool-btn,
        #calculate-all.tool-btn {
            color: #eefbff !important;
            border-width: 1px !important;
            font-weight: 760 !important;
            box-shadow: 0 12px 28px rgba(0,0,0,0.22), inset 0 1px 0 rgba(255,255,255,0.045) !important;
        }
        #add-roi.tool-btn {
            background: linear-gradient(135deg, rgba(78, 170, 190, 0.16), rgba(95, 193, 205, 0.12)) !important;
            border-color: rgba(92, 190, 210, 0.36) !important;
        }
        #align-roi.tool-btn {
            background: linear-gradient(135deg, rgba(91, 190, 205, 0.19), rgba(110, 207, 210, 0.14)) !important;
            border-color: rgba(111, 211, 232, 0.40) !important;
        }
        #apply-roi-all.tool-btn {
            background: linear-gradient(135deg, rgba(116, 203, 172, 0.18), rgba(111, 211, 232, 0.12)) !important;
            border-color: rgba(124, 224, 168, 0.40) !important;
        }
        #calculate-all.tool-btn {
            background: linear-gradient(135deg, rgba(111, 211, 232, 0.22), rgba(124, 224, 168, 0.17)) !important;
            border-color: rgba(124, 224, 168, 0.43) !important;
        }
        #add-roi.tool-btn:hover,
        #align-roi.tool-btn:hover,
        #apply-roi-all.tool-btn:hover,
        #calculate-all.tool-btn:hover,
        #add-roi.tool-btn:focus-visible,
        #align-roi.tool-btn:focus-visible,
        #apply-roi-all.tool-btn:focus-visible,
        #calculate-all.tool-btn:focus-visible {
            color: #ffffff !important;
            filter: saturate(1.08) brightness(1.06);
            transform: translateY(-1px);
        }

        .toolbar { gap: 8px !important; }
        .tool-btn { min-height: 36px; }
        .tool-btn svg { flex: 0 0 auto; }
        .side-stack .floating-panel { border-radius: 15px !important; }
        .panel-header { user-select: none; }
        .metric-card,
        .histogram-stat,
        .quality-panel,
        .advanced-metrics-panel {
            border-color: rgba(173,216,240,0.13) !important;
        }

        @media (max-width: 1100px) and (min-width: 861px) {
            header { padding: 0 14px !important; gap: 10px !important; }
            .toolbar { gap: 6px !important; padding: 5px !important; }
            .tool-btn { padding: 7px 9px !important; font-size: 0.82rem !important; gap: 6px !important; }
            .tool-btn.compact { padding: 7px 8px !important; }
            .header-actions { gap: 6px !important; margin-left: 8px !important; }
            .guide-link,
            .producer-badge { padding: 0 8px !important; }
            .language-control { min-width: 104px !important; }
        }

        @media (max-width: 860px) {
            header { min-width: 0 !important; }
            .app-mobile-menu { max-height: calc(100dvh - 78px); overflow: auto; overscroll-behavior: contain; }
            .app-mobile-menu-grid { grid-template-columns: repeat(3, minmax(0, 1fr)) !important; }
            .app-mobile-menu button,
            .app-mobile-menu a { min-width: 0; line-height: 1.15; }
            .side-stack { left: 10px !important; right: 10px !important; width: auto !important; }
            .filter-panel,
            .auto-panel { left: 10px !important; right: 10px !important; width: auto !important; }
        }

        @media (max-width: 520px) {
            .app-mobile-menu { padding: 10px !important; border-radius: 20px !important; }
            .app-mobile-menu-grid { grid-template-columns: repeat(2, minmax(0, 1fr)) !important; gap: 7px !important; }
            .app-mobile-menu-links,
            .app-mobile-menu-lang { gap: 7px !important; margin-top: 8px !important; }
            .logo-text { font-size: 0.9rem !important; }
            .side-stack { bottom: 82px !important; height: min(46dvh, 420px) !important; }
            body.has-multi-images .side-stack { bottom: 108px !important; }
            .side-stack.collapsed { height: 46px !important; }
            .panel-content { padding: 12px !important; }
            .metrics-grid,
            .advanced-metrics-grid,
            .quality-grid,
            .histogram-stats { gap: 8px !important; }
            #btn-copy-all.tool-btn.copy-action-button { min-height: 44px !important; font-size: 0.82rem !important; }
        }


        /* Final mobile toolbar restoration */
        @media (max-width: 860px) {
            header {
                height: auto !important;
                min-height: 64px !important;
                display: grid !important;
                grid-template-columns: minmax(0, 1fr) auto !important;
                grid-template-areas: "brand actions" "tools tools" !important;
                align-items: center !important;
                row-gap: 8px !important;
                padding: 9px 10px 10px !important;
            }
            .logo-container { grid-area: brand !important; min-width: 0 !important; }
            .header-actions { grid-area: actions !important; justify-self: end !important; align-self: center !important; }
            header > .toolbar {
                grid-area: tools !important;
                display: flex !important;
                width: 100% !important;
                max-width: 100% !important;
                overflow-x: auto !important;
                overflow-y: hidden !important;
                -webkit-overflow-scrolling: touch !important;
                scrollbar-width: thin !important;
                scroll-snap-type: x proximity !important;
                padding: 6px !important;
                gap: 7px !important;
                border-radius: 16px !important;
                background: rgba(9, 20, 36, 0.78) !important;
            }
            header > .toolbar .tool-btn {
                flex: 0 0 auto !important;
                white-space: nowrap !important;
                scroll-snap-align: start !important;
                min-height: 36px !important;
                padding: 7px 10px !important;
                font-size: 0.82rem !important;
            }
            header > .toolbar > div[style*="width: 1px"] { flex: 0 0 1px !important; }
            .header-actions > .guide-link,
            .header-actions > .producer-badge,
            .header-actions > .language-control { display: none !important; }
            .app-menu-toggle { display: inline-flex !important; }
            .app-mobile-menu { top: calc(54px + env(safe-area-inset-top)) !important; }
            .app-mobile-menu-grid { display: none !important; }
            .app-mobile-menu-head small::after { content: " / Kılavuz, AllJect, dil"; }
            main { min-height: 0 !important; }
        }
        @media (max-width: 420px) {
            .logo-text { font-size: 0.86rem !important; max-width: calc(100vw - 76px) !important; }
            header > .toolbar .tool-btn { padding: 7px 9px !important; font-size: 0.79rem !important; }
            header > .toolbar .tool-btn svg { width: 16px !important; height: 16px !important; }
            .app-menu-toggle { width: 36px !important; height: 36px !important; border-radius: 13px !important; }
        }


        /* Final lightweight motion and touch performance polish */
        header > .toolbar,
        .app-mobile-menu,
        .side-stack,
        .floating-panel {
            will-change: transform, opacity;
        }
        .tool-btn,
        .app-mobile-menu button,
        .app-mobile-menu a,
        .image-thumb,
        .column-card {
            transition: transform 0.16s ease, background 0.16s ease, border-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease !important;
        }
        .tool-btn:active,
        .app-mobile-menu button:active,
        .app-mobile-menu a:active {
            transform: translateY(0) scale(0.985) !important;
        }
        @media (max-width: 860px) {
            header > .toolbar::after {
                content: "";
                flex: 0 0 10px;
                height: 1px;
            }
            header > .toolbar::-webkit-scrollbar { height: 4px; }
            header > .toolbar::-webkit-scrollbar-thumb { background: rgba(111,211,232,0.32); border-radius: 999px; }
        }


        /* Final localized mobile menu helper labels */
        @media (max-width: 860px) {
            :root[data-current-language="tr"] .app-mobile-menu-head small::after { content: " / K\0131lavuz, AllJect, dil" !important; }
            :root[data-current-language="en"] .app-mobile-menu-head small::after { content: " / Guide, AllJect, language" !important; }
            :root[data-current-language="de"] .app-mobile-menu-head small::after { content: " / Handbuch, AllJect, Sprache" !important; }
        }

        /* Final interaction, z-index and responsive header fix */
        #side-stack,
        .side-stack,
        .floating-panel,
        .filter-panel,
        .auto-panel,
        .alignment-preview-panel,
        .copy-assist-panel,
        .export-preflight-panel,
        .notification-center,
        .app-mobile-menu {
            pointer-events: auto !important;
        }
        #side-stack { z-index: 1560 !important; }
        .filter-panel,
        .auto-panel { z-index: 1580 !important; }
        .alignment-preview-panel { z-index: 1590 !important; }
        .notification-center { z-index: 2100 !important; pointer-events: none !important; }
        .notification-center,
        .notification-center *,
        .notification-center .app-toast,
        .notification-center .app-toast * {
            pointer-events: none !important;
        }
        .app-mobile-menu { z-index: 2400 !important; }
        .app-menu-toggle { z-index: 2450 !important; }
        .side-stack,
        .side-stack-content,
        .floating-panel,
        .panel-content,
        .metric-card,
        .quality-panel,
        .advanced-metrics-panel,
        .histogram-wrapper,
        .roi-table,
        .roi-detail-panel,
        .copy-assist-panel,
        .export-preflight-panel,
        .app-toast-message {
            user-select: text !important;
            -webkit-user-select: text !important;
        }
        .btn-collapse,
        .tool-btn,
        .mini-btn,
        .thumb-action,
        .app-menu-toggle,
        .app-mobile-menu button,
        .app-mobile-menu a,
        input,
        select,
        label,
        canvas,
        svg {
            user-select: none !important;
            -webkit-user-select: none !important;
        }
        .panel-header { cursor: default !important; }
        .btn-collapse { cursor: pointer !important; touch-action: manipulation !important; }
        body.no-image #side-stack {
            opacity: 0 !important;
            visibility: hidden !important;
            pointer-events: none !important;
            transform: translateY(10px) scale(0.985) !important;
        }
        body.no-image .empty-state {
            z-index: 1900 !important;
            pointer-events: auto !important;
        }
        body.no-image .empty-upload-card,
        body.no-image .empty-upload-card * {
            pointer-events: auto !important;
        }
        body:not(.no-image) .empty-state {
            display: none !important;
            visibility: hidden !important;
            pointer-events: none !important;
            z-index: -1 !important;
        }
        body:not(.no-image) #canvas-container,
        body:not(.no-image) #canvas-container .konvajs-content,
        body:not(.no-image) #canvas-container canvas {
            pointer-events: auto !important;
            touch-action: none !important;
        }
        body:not(.no-image) #side-stack {
            visibility: visible !important;
            opacity: 1 !important;
            pointer-events: auto !important;
        }
        .alignment-preview-panel:not(.visible),
        .filter-panel:not(.visible),
        .auto-panel:not(.visible) {
            display: none !important;
            visibility: hidden !important;
            pointer-events: none !important;
        }
        .alignment-preview-panel:not(.visible) *,
        .filter-panel:not(.visible) *,
        .auto-panel:not(.visible) * {
            pointer-events: none !important;
        }
        .alignment-preview-panel.visible {
            display: block !important;
            visibility: visible !important;
        }
        .filter-panel.visible {
            display: flex !important;
            visibility: visible !important;
        }
        .auto-panel.visible {
            display: grid !important;
            visibility: visible !important;
        }
        #side-stack.collapsed {
            height: 46px !important;
            max-height: 46px !important;
            min-height: 46px !important;
            overflow: hidden !important;
        }
        #side-stack.collapsed .side-stack-content {
            display: none !important;
        }
        #side-stack.mobile-expanded {
            height: var(--side-stack-open-height, 388px) !important;
            max-height: var(--side-stack-open-height, 388px) !important;
            min-height: 180px !important;
            overflow: hidden !important;
        }
        #side-stack.mobile-expanded .side-stack-content {
            display: flex !important;
        }
        #side-stack .side-stack-header {
            position: relative !important;
            z-index: 3 !important;
            pointer-events: auto !important;
        }
        #side-stack-toggle {
            position: relative !important;
            z-index: 4 !important;
            pointer-events: auto !important;
        }
        #side-stack .side-stack-content {
            overflow-y: auto !important;
            overscroll-behavior: contain !important;
            -webkit-overflow-scrolling: touch !important;
            touch-action: pan-y !important;
        }

        @media (min-width: 861px) and (max-width: 980px) {
            header {
                height: 66px !important;
                padding: 8px 12px !important;
                align-items: center !important;
                gap: 10px !important;
            }
            .logo-container,
            .toolbar,
            .header-actions {
                align-self: center !important;
            }
            .toolbar {
                flex: 1 1 auto !important;
                min-width: 0 !important;
                max-width: calc(100vw - 318px) !important;
                overflow-x: auto !important;
                overflow-y: hidden !important;
                -webkit-overflow-scrolling: touch !important;
                padding: 5px !important;
                gap: 6px !important;
            }
            .toolbar .tool-btn {
                flex: 0 0 auto !important;
                padding: 7px 9px !important;
                font-size: 0.8rem !important;
                white-space: nowrap !important;
            }
            .header-actions {
                flex: 0 0 auto !important;
                margin-left: 0 !important;
                gap: 6px !important;
            }
            .guide-link,
            .producer-badge,
            .language-control {
                height: 32px !important;
                transform: none !important;
            }
        }

        /* Release polish: subtle, non-blocking UI motion */
        @keyframes releaseCardIn {
            from { opacity: 0; transform: translateY(8px) scale(0.988); }
            to { opacity: 1; transform: translateY(0) scale(1); }
        }
        @keyframes releaseMenuIn {
            from { opacity: 0; transform: translateY(-8px) scale(0.985); }
            to { opacity: 1; transform: translateY(0) scale(1); }
        }
        @keyframes releaseButtonSheen {
            0%, 62% { transform: translateX(-130%) skewX(-16deg); opacity: 0; }
            74% { opacity: 0.26; }
            100% { transform: translateX(130%) skewX(-16deg); opacity: 0; }
        }
        @keyframes releaseActiveRoi {
            0% { box-shadow: inset 3px 0 rgba(111,211,232,0.0), 0 0 0 rgba(111,211,232,0.0); }
            100% { box-shadow: inset 3px 0 rgba(111,211,232,0.72), 0 0 18px rgba(111,211,232,0.08); }
        }
        .empty-upload-card,
        body:not(.no-image) #side-stack,
        .copy-assist-panel,
        .export-preflight-panel {
            animation: releaseCardIn 0.28s cubic-bezier(.2,.85,.24,1) both;
        }
        .app-mobile-menu.open {
            animation: releaseMenuIn 0.18s cubic-bezier(.2,.85,.24,1) both;
            transform-origin: top right;
        }
        .btn-upload,
        #btn-copy-all,
        #calculate-all {
            isolation: isolate;
            overflow: hidden;
            position: relative;
        }
        .btn-upload::after,
        #btn-copy-all::after,
        #calculate-all::after {
            content: "";
            position: absolute;
            inset: -25% -45%;
            background: linear-gradient(90deg, transparent, rgba(255,255,255,0.34), transparent);
            pointer-events: none;
            opacity: 0;
            animation: releaseButtonSheen 4.8s ease-in-out infinite;
        }
        #calculate-all::after { animation-delay: 1.3s; }
        #btn-copy-all::after { animation-delay: 2.2s; }
        .roi-row {
            transition: background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
        }
        .roi-row.active {
            animation: releaseActiveRoi 0.32s ease both;
        }
        .roi-row:hover {
            transform: translateX(1px);
        }
        .metric-card,
        .histogram-stat,
        .quality-panel,
        .advanced-metrics-panel {
            transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
        }
        .metric-card:hover,
        .histogram-stat:hover {
            transform: translateY(-1px);
            border-color: rgba(111,211,232,0.24) !important;
        }
        .tool-btn:focus-visible,
        .btn-collapse:focus-visible,
        .app-menu-toggle:focus-visible {
            outline: 2px solid rgba(111,211,232,0.62) !important;
            outline-offset: 2px;
        }

        /* Responsive guardrails: header tools may scroll inside their rail, never the page. */
        html,
        body {
            max-width: 100%;
            overflow-x: hidden !important;
        }
        header {
            min-width: 0 !important;
            gap: 12px !important;
        }
        .logo-container {
            flex: 0 1 auto !important;
            min-width: 0 !important;
        }
        header > .toolbar {
            flex: 1 1 auto !important;
            min-width: 0 !important;
            max-width: 100% !important;
            overflow-x: auto !important;
            overflow-y: hidden !important;
            -webkit-overflow-scrolling: touch !important;
            scrollbar-width: thin;
        }
        header > .toolbar .tool-btn {
            flex: 0 0 auto !important;
        }
        .header-actions {
            flex: 0 0 auto !important;
            min-width: 0 !important;
        }
        .btn-upload::after,
        #btn-copy-all::after,
        #calculate-all::after {
            inset: 0 !important;
        }
        .btn-upload::after {
            content: none !important;
            display: none !important;
            animation: none !important;
        }

        @media (max-width: 860px) {
            .build-version-badge,
            .background-analysis-status {
                left: 10px !important;
                right: auto !important;
                max-width: calc(100vw - 20px) !important;
                overflow: hidden !important;
                text-overflow: ellipsis !important;
                white-space: nowrap !important;
            }
            .build-version-badge {
                top: calc(124px + env(safe-area-inset-top)) !important;
            }
            .background-analysis-status {
                top: calc(146px + env(safe-area-inset-top)) !important;
            }
            body.app-menu-open .build-version-badge,
            body.app-menu-open .background-analysis-status {
                opacity: 0 !important;
                visibility: hidden !important;
            }
        }

        @media (min-width: 1181px) and (max-width: 1440px) {
            .producer-badge { display: none !important; }
            .guide-link { padding: 0 9px !important; }
            .language-control { min-width: 108px !important; }
            header > .toolbar { gap: 6px !important; padding: 5px !important; }
            header > .toolbar .tool-btn { padding: 7px 9px !important; font-size: 0.82rem !important; gap: 6px !important; }
            header > .toolbar .tool-btn.compact { padding: 7px 8px !important; }
        }

        @media (prefers-reduced-motion: reduce) {
            *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
        }