/* ── Tool-spezifische Overrides & Ergänzungen ── */

        /* Layout */
        .tab-bar {
            display: flex;
            background: var(--clr-surface);
            border-bottom: 1px solid var(--border-color);
            padding: 0 8px;
            flex-wrap: wrap;
            gap: 2px;
        }

        .tab-btn {
            padding: 10px 16px;
            border: none;
            background: transparent;
            color: var(--clr-muted);
            cursor: pointer;
            font-size: .85rem;
            font-weight: 600;
            border-bottom: 3px solid transparent;
            transition: var(--transition-fast);
            white-space: nowrap;
            font-family: inherit;
        }

        .tab-btn:hover {
            color: var(--clr-text);
            background: var(--box-bg);
        }

        .tab-btn.active {
            color: var(--clr-accent-text);
            border-bottom-color: var(--clr-accent);
        }

        .tab-btn.exercise-tab {
            color: var(--warning-text);
        }

        .tab-btn.exercise-tab.active {
            border-bottom-color: var(--warning);
            color: var(--warning-text);
        }

        .tab-content {
            display: none;
            padding: 16px;
        }

        .tab-content.active {
            display: block;
        }

        /* Rule Box */
        .rule-box {
            background: var(--box-bg);
            border-left: 4px solid var(--clr-accent2);
            border-radius: var(--radius);
            padding: 14px 18px;
            margin-bottom: 14px;
            border: 1px solid var(--border-color);
            border-left: 4px solid var(--clr-accent2);
        }

        .rule-box h2 {
            font-size: .95rem;
            color: var(--clr-accent2-text);
            margin-bottom: 8px;
        }

        .rule-select-row {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 10px;
        }

        .rule-select-row label {
            font-size: .85rem;
            font-weight: 600;
            color: var(--clr-accent2-text);
        }

        .rule-select-row select {
            padding: 5px 10px;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            font-size: .85rem;
            background: var(--clr-bg);
            color: var(--clr-text);
            font-family: inherit;
        }

        .rule-desc {
            background: var(--clr-bg);
            border-radius: 8px;
            padding: 10px 14px;
            font-size: .83rem;
            line-height: 1.8;
            color: var(--clr-muted);
            border: 1px solid var(--border-color);
        }

        .rule-desc code {
            background: rgba(56, 189, 248, .15);
            color: var(--clr-accent2-text);
            padding: 1px 5px;
            border-radius: 3px;
            font-family: monospace;
        }

        /* Custom Rule */
        .custom-rule-area {
            margin-top: 10px;
            background: var(--clr-bg);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 12px;
        }

        .custom-rule-area h4 {
            font-size: .85rem;
            color: var(--clr-accent-text);
            margin-bottom: 8px;
        }

        .custom-rule-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 8px;
            margin-bottom: 8px;
        }

        .custom-rule-grid label {
            font-size: .78rem;
            color: var(--clr-muted);
            font-weight: 600;
            display: flex;
            align-items: center;
        }

        .custom-rule-grid input,
        .custom-rule-grid select {
            width: 100%;
            padding: 4px 8px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            font-size: .82rem;
            background: var(--clr-surface);
            color: var(--clr-text);
            font-family: inherit;
        }

        .custom-feedback {
            font-size: .8rem;
            padding: 6px 10px;
            border-radius: 5px;
            margin-top: 6px;
        }

        .custom-feedback.ok {
            background: rgba(52, 211, 153, .1);
            color: var(--success-text);
            border: 1px solid var(--success);
        }

        .custom-feedback.err {
            background: rgba(248, 113, 113, .1);
            color: var(--danger-text);
            border: 1px solid var(--danger);
        }

        /* Example Bar */
        .example-bar {
            background: rgba(251, 191, 36, .07);
            border: 1px solid rgba(251, 191, 36, .3);
            border-radius: 8px;
            padding: 8px 12px;
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .example-bar label {
            font-size: .83rem;
            font-weight: 600;
            color: var(--warning-text);
        }

        .example-bar select {
            padding: 4px 8px;
            border-radius: 5px;
            border: 1px solid rgba(251, 191, 36, .4);
            font-size: .83rem;
            background: var(--clr-bg);
            color: var(--clr-text);
            font-family: inherit;
        }

        /* Main Area */
        .main-area {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            flex-wrap: wrap;
        }

        .datagram-section {
            flex: 0 0 auto;
            width: min(100%, 430px);
        }

        .raster-section {
            flex: 1;
            min-width: 260px;
        }

        /* Datagramm */
        .datagram-section h3,
        .raster-section h3 {
            font-size: .95rem;
            color: var(--clr-text);
            margin-bottom: 10px;
            padding-bottom: 5px;
            border-bottom: 2px solid var(--border-color);
        }

        .datagram-container {
            background: var(--clr-surface);
            border-radius: var(--radius);
            padding: 14px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
        }

        .section-label {
            font-size: .72rem;
            font-weight: 700;
            color: var(--clr-muted);
            text-transform: uppercase;
            letter-spacing: .05em;
            margin: 8px 0 3px;
        }

        .byte-row {
            display: flex;
            align-items: stretch;
            margin-bottom: 4px;
            border-radius: 6px;
            overflow: hidden;
            border: 2px solid transparent;
        }

        .byte-label {
            width: 125px;
            min-width: 125px;
            font-size: .68rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            padding: 5px 6px;
            border-radius: 6px 0 0 6px;
            line-height: 1.2;
        }

        .byte-bits {
            display: flex;
            flex: 1;
        }

        .bit-cell {
            flex: 1;
            text-align: center;
            font-family: 'Courier New', monospace;
            font-size: .95rem;
            font-weight: bold;
            padding: 6px 1px;
            border-left: 1px solid rgba(255, 255, 255, .08);
            cursor: pointer;
            transition: background .1s;
            min-width: 22px;
            touch-action: manipulation;
        }

        .bit-cell:first-child {
            border-left: none;
        }

        .byte-value-display {
            display: flex;
            align-items: center;
            margin-left: 3px;
            font-size: .72rem;
            color: var(--clr-muted);
            min-width: 42px;
        }

        .byte-value-display span {
            background: var(--box-bg);
            border-radius: 4px;
            padding: 2px 4px;
            font-family: monospace;
            white-space: nowrap;
            border: 1px solid var(--border-color);
        }

        .byte-row.header-byte {
            border-color: var(--clr-accent2);
        }

        .byte-row.header-byte .byte-label {
            background: var(--clr-accent2);
            color: #0f172a;
        }

        .byte-row.header-byte .bit-cell {
            background: rgba(56, 189, 248, .12);
            color: var(--clr-accent2-text);
        }

        .byte-row.header-byte .bit-cell:hover {
            background: rgba(56, 189, 248, .25);
        }

        .byte-row.payload-byte {
            border-color: var(--clr-accent);
        }

        .byte-row.payload-byte .byte-label {
            background: var(--clr-accent);
            color: #0f172a;
        }

        .byte-row.payload-byte .bit-cell {
            background: rgba(52, 211, 153, .1);
            color: var(--clr-accent-text);
        }

        .byte-row.payload-byte .bit-cell:hover {
            background: rgba(52, 211, 153, .22);
        }

        .byte-row.payload-rle {
            border-color: var(--warning);
        }

        .byte-row.payload-rle .byte-label {
            background: var(--warning);
            color: #0f172a;
        }

        .byte-row.payload-rle .bit-cell {
            background: rgba(251, 191, 36, .1);
            color: var(--warning-text);
        }

        .byte-row.payload-rle .bit-cell:hover {
            background: rgba(251, 191, 36, .22);
        }

        .bit-index-row {
            display: flex;
            margin-bottom: 2px;
        }

        .bit-index-spacer {
            width: 125px;
            min-width: 125px;
        }

        .bit-index-cell {
            flex: 1;
            text-align: center;
            font-size: .6rem;
            color: var(--clr-muted);
            min-width: 22px;
        }

        .separator {
            border: none;
            border-top: 1px dashed var(--border-color);
            margin: 6px 0;
        }

        .payload-scroll {
            max-height: 320px;
            overflow-y: auto;
            padding-right: 2px;
        }

        .payload-scroll::-webkit-scrollbar {
            width: 5px;
        }

        .payload-scroll::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 3px;
        }

        /* Raster */
        .raster-container {
            background: var(--clr-surface);
            border-radius: var(--radius);
            padding: 14px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
        }

        .raster-info {
            display: flex;
            gap: 8px;
            margin-bottom: 10px;
            flex-wrap: wrap;
        }

        .info-badge {
            background: var(--box-bg);
            border: 1px solid var(--border-color);
            border-radius: 5px;
            padding: 3px 8px;
            font-size: .78rem;
            color: var(--clr-muted);
        }

        .info-badge strong {
            color: var(--clr-accent2-text);
        }

        .pixel-canvas-wrap {
            overflow: auto;
            max-width: 100%;
            max-height: 440px;
            display: inline-block;
        }

        #pixel-grid-bw,
        #pixel-grid-gs,
        #pixel-grid-color {
            display: inline-grid;
            cursor: crosshair;
        }

        .pixel {
            border: none;
        }

        .legend {
            display: flex;
            gap: 10px;
            margin-top: 10px;
            flex-wrap: wrap;
        }

        .legend-item {
            display: flex;
            align-items: center;
            gap: 5px;
            font-size: .77rem;
            color: var(--clr-muted);
        }

        .legend-color {
            width: 16px;
            height: 16px;
            border-radius: 3px;
            border: 1px solid var(--border-color);
            flex-shrink: 0;
        }

        /* Palette */
        .palette-section {
            margin-bottom: 10px;
        }

        .palette-section h4 {
            font-size: .82rem;
            color: var(--clr-muted);
            margin-bottom: 6px;
            font-weight: 600;
        }

        .palette-grid {
            display: flex;
            gap: 5px;
            flex-wrap: wrap;
            align-items: center;
        }

        .palette-swatch {
            width: 28px;
            height: 28px;
            border-radius: 5px;
            border: 2px solid var(--border-color);
            cursor: pointer;
            transition: transform .15s, border-color .15s;
            flex-shrink: 0;
            touch-action: manipulation;
        }

        .palette-swatch:hover {
            transform: scale(1.15);
        }

        .palette-swatch.selected {
            border-color: var(--clr-accent2);
            transform: scale(1.15);
            box-shadow: 0 0 0 2px rgba(56, 189, 248, .4);
        }

        .custom-color-wrap {
            display: flex;
            align-items: center;
            gap: 6px;
            margin-top: 6px;
            flex-wrap: wrap;
        }

        .custom-color-wrap label {
            font-size: .78rem;
            color: var(--clr-muted);
        }

        .custom-color-wrap input[type=color] {
            width: 36px;
            height: 28px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            cursor: pointer;
            padding: 1px;
            background: transparent;
        }

        /* Sliders */
        input[type=range] {
            -webkit-appearance: none;
            appearance: none;
            height: 8px;
            border-radius: 4px;
            outline: none;
            cursor: pointer;
        }

        input[type=range]::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            cursor: pointer;
            border: 2px solid var(--clr-bg);
            box-shadow: 0 1px 4px rgba(0, 0, 0, .4);
        }

        .gray-slider {
            background: rgba(148, 163, 184, .3);
        }

        .gray-slider::-webkit-slider-thumb {
            background: var(--clr-muted);
        }

        .red-slider {
            background: rgba(248, 113, 113, .3);
        }

        .red-slider::-webkit-slider-thumb {
            background: var(--danger);
        }

        .green-slider {
            background: rgba(52, 211, 153, .3);
        }

        .green-slider::-webkit-slider-thumb {
            background: var(--clr-accent);
        }

        .blue2-slider {
            background: rgba(56, 189, 248, .3);
        }

        .blue2-slider::-webkit-slider-thumb {
            background: var(--clr-accent2);
        }

        /* GS Payload */
        .gs-byte-cell {
            display: flex;
            align-items: center;
            gap: 5px;
            padding: 4px 5px;
            background: var(--box-bg);
            border-radius: 4px;
            margin: 2px 0;
            border: 1px solid var(--border-color);
        }

        .gs-byte-cell label {
            font-size: .68rem;
            color: var(--clr-muted);
            min-width: 60px;
            flex-shrink: 0;
        }

        .gs-value-box {
            font-family: monospace;
            font-size: .78rem;
            background: var(--clr-bg);
            border: 1px solid var(--border-color);
            padding: 2px 4px;
            border-radius: 4px;
            min-width: 30px;
            text-align: center;
            color: var(--clr-text);
        }

        /* Grauwert-Vorschau im Datagramm – immer sichtbarer Rand */
        .gs-preview-box {
            width: 20px;
            height: 20px;
            border-radius: 3px;
            box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.5),
                0 0 0 1px rgba(255, 255, 255, 0.4);
            border: none !important;
            flex-shrink: 0;
        }

        .gs-bin-span {
            font-family: monospace;
            font-size: .66rem;
            color: var(--clr-accent-text);
            min-width: 64px;
        }

        /* Color Triplet */
        .color-triplet {
            background: var(--box-bg);
            border-radius: 6px;
            padding: 5px 7px;
            margin-bottom: 3px;
            border-left: 3px solid #805ad5;
            border: 1px solid var(--border-color);
            border-left: 3px solid #a78bfa;
        }

        .triplet-label {
            font-size: .68rem;
            color: var(--clr-muted);
            margin-bottom: 3px;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 5px;
        }

        .color-swatch-inline {
            width: 18px;
            height: 18px;
            border-radius: 3px;
            border: 1px solid var(--border-color);
            display: inline-block;
            flex-shrink: 0;
        }

        .channel-row {
            display: flex;
            align-items: center;
            gap: 4px;
            margin-bottom: 2px;
        }

        .channel-label {
            width: 14px;
            font-weight: bold;
            font-size: .73rem;
            flex-shrink: 0;
        }

        .channel-label.r {
            color: var(--danger-text);
        }

        .channel-label.g {
            color: var(--clr-accent-text);
        }

        .channel-label.b {
            color: var(--clr-accent2-text);
        }

        .ch-val {
            font-family: monospace;
            font-size: .73rem;
            min-width: 24px;
            text-align: right;
            flex-shrink: 0;
            color: var(--clr-text);
        }

        .ch-bin {
            font-family: monospace;
            font-size: .63rem;
            color: var(--clr-muted);
            min-width: 64px;
            flex-shrink: 0;
        }

        /* Buttons */
        .controls {
            display: flex;
            gap: 8px;
            margin-top: 12px;
            flex-wrap: wrap;
        }

        .btn {
            padding: 7px 14px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            cursor: pointer;
            font-size: .83rem;
            font-weight: 600;
            transition: var(--transition-fast);
            touch-action: manipulation;
            font-family: inherit;
            background: var(--box-bg);
            color: var(--clr-text);
        }

        .btn:hover {
            transform: translateY(-1px);
            box-shadow: var(--shadow);
        }

        .btn-primary {
            background: var(--clr-accent2);
            color: #0f172a;
            border-color: var(--clr-accent2);
        }

        .btn-primary:hover {
            background: #7dd3fc;
        }

        .btn-success {
            background: var(--clr-accent);
            color: #0f172a;
            border-color: var(--clr-accent);
        }

        .btn-success:hover {
            background: #6ee7b7;
        }

        .btn-secondary {
            background: var(--box-bg);
            color: var(--clr-muted);
        }

        .btn-secondary:hover {
            color: var(--clr-text);
            border-color: var(--clr-muted);
        }

        .btn-warning {
            background: var(--warning);
            color: #0f172a;
            border-color: var(--warning);
        }

        .btn-warning:hover {
            background: #fcd34d;
        }

        .error-box {
            background: rgba(248, 113, 113, .1);
            border: 1px solid var(--danger);
            border-radius: 5px;
            padding: 7px 10px;
            font-size: .82rem;
            color: var(--danger-text);
            margin-top: 6px;
            display: none;
        }

        /* Draw Mode Bar */
        .draw-mode-bar {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 6px 10px;
            background: var(--box-bg);
            border-radius: 8px;
            margin-bottom: 8px;
            flex-wrap: wrap;
            border: 1px solid var(--border-color);
        }

        .draw-mode-bar label {
            font-size: .8rem;
            font-weight: 600;
            color: var(--clr-muted);
        }

        .mode-btn {
            padding: 4px 10px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            cursor: pointer;
            font-size: .78rem;
            background: var(--clr-bg);
            color: var(--clr-muted);
            transition: var(--transition-fast);
            touch-action: manipulation;
            font-family: inherit;
        }

        .mode-btn.active {
            border-color: var(--clr-accent2);
            background: rgba(56, 189, 248, .15);
            color: var(--clr-accent2-text);
            font-weight: 600;
        }

        .rle-info {
            background: rgba(251, 191, 36, .08);
            border: 1px solid rgba(251, 191, 36, .3);
            border-radius: 5px;
            padding: 6px 10px;
            font-size: .78rem;
            color: var(--warning-text);
            margin-bottom: 6px;
        }

        /* ══ EXERCISE STYLES ══ */
        .exercise-page {
            max-width: 960px;
        }

        .stats-bar {
            background: var(--clr-surface);
            border-radius: var(--radius);
            padding: 14px 18px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
            margin-bottom: 16px;
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            align-items: center;
        }

        .stat-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            min-width: 65px;
        }

        .stat-value {
            font-size: 1.8rem;
            font-weight: 800;
            line-height: 1;
        }

        .stat-label {
            font-size: .7rem;
            color: var(--clr-muted);
            font-weight: 600;
            text-transform: uppercase;
        }

        .stat-item.correct .stat-value {
            color: var(--success-text);
        }

        .stat-item.wrong .stat-value {
            color: var(--danger-text);
        }

        .stat-item.streak .stat-value {
            color: var(--warning-text);
        }

        .stat-item.total .stat-value {
            color: var(--clr-accent2-text);
        }

        .progress-wrap {
            flex: 1;
            min-width: 160px;
        }

        .progress-label {
            font-size: .75rem;
            color: var(--clr-muted);
            margin-bottom: 4px;
            display: flex;
            justify-content: space-between;
        }

        .progress-bar-bg {
            background: var(--box-bg);
            border-radius: 99px;
            height: 12px;
            overflow: hidden;
            border: 1px solid var(--border-color);
        }

        .progress-bar-fill {
            height: 100%;
            border-radius: 99px;
            background: linear-gradient(90deg, var(--clr-accent), var(--clr-accent2));
            transition: width .5s ease;
        }

        .difficulty-bar {
            display: flex;
            gap: 8px;
            margin-bottom: 16px;
            flex-wrap: wrap;
            align-items: center;
        }

        .difficulty-bar label {
            font-size: .85rem;
            font-weight: 600;
            color: var(--clr-muted);
        }

        .diff-btn {
            padding: 6px 16px;
            border: 1px solid var(--border-color);
            border-radius: 20px;
            cursor: pointer;
            font-size: .82rem;
            font-weight: 600;
            background: var(--box-bg);
            color: var(--clr-muted);
            transition: var(--transition-fast);
            touch-action: manipulation;
            font-family: inherit;
        }

        .diff-btn[data-diff="easy"].active {
            background: var(--success);
            border-color: var(--success);
            color: #0f172a;
        }

        .diff-btn[data-diff="medium"].active {
            background: var(--warning);
            border-color: var(--warning);
            color: #0f172a;
        }

        .diff-btn[data-diff="hard"].active {
            background: var(--danger);
            border-color: var(--danger);
            color: #fff;
        }

        .diff-btn[data-diff="expert"].active {
            background: #a78bfa;
            border-color: #a78bfa;
            color: #0f172a;
        }

        /* Exercise Card */
        .exercise-card {
            background: var(--clr-surface);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
            margin-bottom: 16px;
            position: relative;
            overflow: hidden;
            animation: slideDown .35s ease;
        }

        .exercise-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
        }

        .exercise-card.type-decode::before {
            background: linear-gradient(90deg, var(--clr-accent2), #7dd3fc);
        }

        .exercise-card.type-encode::before {
            background: linear-gradient(90deg, var(--clr-accent), #6ee7b7);
        }

        .exercise-card.type-full::before {
            background: linear-gradient(90deg, #a78bfa, #c4b5fd);
        }

        .ex-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            margin-bottom: 12px;
            gap: 10px;
            flex-wrap: wrap;
        }

        .ex-title {
            font-size: 1rem;
            font-weight: 700;
            color: var(--clr-text);
        }

        .ex-badges {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }

        /* Reuse badge from zec.css – override colours */
        .badge {
            padding: 3px 10px;
            border-radius: 20px;
            font-size: .72rem;
            font-weight: 700;
            text-transform: uppercase;
        }

        .badge-decode {
            background: rgba(56, 189, 248, .15);
            color: var(--clr-accent2-text);
        }

        .badge-encode {
            background: rgba(52, 211, 153, .15);
            color: var(--clr-accent-text);
        }

        .badge-full {
            background: rgba(167, 139, 250, .15);
            color: #a78bfa;
        }

        .badge-easy {
            background: rgba(52, 211, 153, .1);
            color: var(--success-text);
        }

        .badge-medium {
            background: rgba(251, 191, 36, .1);
            color: var(--warning-text);
        }

        .badge-hard {
            background: rgba(248, 113, 113, .1);
            color: var(--danger-text);
        }

        .badge-expert {
            background: rgba(167, 139, 250, .1);
            color: #a78bfa;
        }

        .ex-desc {
            font-size: .88rem;
            color: var(--clr-muted);
            margin-bottom: 14px;
            line-height: 1.6;
        }

        .ex-desc strong {
            color: var(--clr-accent2-text);
        }

        .ex-desc code {
            background: rgba(56, 189, 248, .12);
            color: var(--clr-accent2-text);
            padding: 1px 5px;
            border-radius: 3px;
            font-family: monospace;
        }

        .answer-section {
            margin-top: 14px;
            border-top: 1px dashed var(--border-color);
            padding-top: 14px;
        }

        .answer-section h4 {
            font-size: .85rem;
            font-weight: 600;
            color: var(--clr-muted);
            margin-bottom: 8px;
        }

        /* Datagram Input (exercise) */
        .ex-datagram {
            background: var(--box-bg);
            border-radius: 8px;
            padding: 12px;
            margin-bottom: 10px;
            border: 1px solid var(--border-color);
        }

        .ex-datagram-title {
            font-size: .78rem;
            font-weight: 700;
            color: var(--clr-muted);
            text-transform: uppercase;
            margin-bottom: 8px;
        }

        .ex-byte-row {
            display: flex;
            align-items: center;
            gap: 6px;
            margin-bottom: 6px;
            flex-wrap: wrap;
        }

        .ex-byte-label {
            font-size: .72rem;
            font-weight: 600;
            min-width: 110px;
            color: var(--clr-muted);
        }

        .ex-bit-cells {
            display: flex;
            gap: 3px;
        }

        .ex-bit-cell {
            width: 30px;
            height: 30px;
            text-align: center;
            font-family: 'Courier New', monospace;
            font-size: 1rem;
            font-weight: bold;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            cursor: pointer;
            background: var(--clr-bg);
            color: var(--clr-text);
            line-height: 30px;
            transition: var(--transition-fast);
            touch-action: manipulation;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .ex-bit-cell.header-cell {
            border-color: rgba(56, 189, 248, .4);
            background: rgba(56, 189, 248, .08);
            color: var(--clr-accent2-text);
        }

        .ex-bit-cell.header-cell:hover {
            background: rgba(56, 189, 248, .2);
        }

        .ex-bit-cell.payload-cell {
            border-color: rgba(52, 211, 153, .4);
            background: rgba(52, 211, 153, .08);
            color: var(--clr-accent-text);
        }

        .ex-bit-cell.payload-cell:hover {
            background: rgba(52, 211, 153, .2);
        }

        .ex-bit-cell.active {
            background: var(--clr-text) !important;
            color: var(--clr-bg) !important;
            border-color: var(--clr-text) !important;
        }

        .ex-bit-cell.header-cell.active {
            background: var(--clr-accent2) !important;
            color: #0f172a !important;
            border-color: var(--clr-accent2) !important;
        }

        .ex-bit-cell.payload-cell.active {
            background: var(--clr-accent) !important;
            color: #0f172a !important;
            border-color: var(--clr-accent) !important;
        }

        .ex-bit-cell.locked {
            cursor: default;
            opacity: .7;
        }

        .ex-byte-val {
            display: none;
        }

        /* Lösung nicht verraten */

        /* Pixel Grid (exercise) */
        /* ── Pixel-Grid (exercise) – vollständig neu ── */
        .ex-pixel-grid {
            display: inline-grid;
            border: 2px solid var(--clr-muted);
            border-radius: 3px;
            overflow: hidden;
            margin: 6px 0;
            background: #ffffff;
            /* Fallback */
        }

        .ex-pixel {
            box-sizing: border-box;
            cursor: pointer;
        }

        /* Schwarz immer dunkel, Weiß immer hell – unabhängig vom Theme */
        .ex-pixel.black {
            background: #1a202c !important;
            border-color: #4a5568 !important;
        }

        .ex-pixel.white {
            background: #ffffff !important;
            border-color: #cbd5e0 !important;
        }

        .ex-pixel.locked {
            cursor: default;
        }

        /* Raster immer sichtbar – Rahmen auch bei hellen Pixeln */
        .ex-pixel-grid .ex-pixel {
            border: 1px solid #a0aec0;
        }

        /* Tool-Pixel-Grids: Raster auch bei hellen Farben sichtbar */
        #pixel-grid-bw .pixel,
        #pixel-grid-gs .pixel,
        #pixel-grid-color .pixel {
            border: 1px solid #a0aec0 !important;
            box-sizing: border-box;
        }

        /* Im Dark-Mode: Raster etwas heller damit es auf dunklem BG sichtbar bleibt */
        html:not([data-theme="light"]) #pixel-grid-bw .pixel,
        html:not([data-theme="light"]) #pixel-grid-gs .pixel,
        html:not([data-theme="light"]) #pixel-grid-color .pixel {
            border-color: #718096 !important;
        }

        /* Weiße BW-Pixel im Dark-Mode: explizit weiß */
        html:not([data-theme="light"]) #pixel-grid-bw .pixel[style*="background: rgb(255, 255, 255)"],
        html:not([data-theme="light"]) #pixel-grid-bw .pixel[style*="background:#fff"] {
            background: #ffffff !important;
        }

        /* Number Input */
        .val-input {
            width: 70px;
            padding: 6px 8px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: .95rem;
            font-family: monospace;
            text-align: center;
            background: var(--clr-bg);
            color: var(--clr-text);
        }

        .val-input:focus {
            outline: none;
            border-color: var(--clr-accent2);
        }

        .val-input.correct {
            border-color: var(--success);
            background: rgba(52, 211, 153, .08);
        }

        .val-input.wrong {
            border-color: var(--danger);
            background: rgba(248, 113, 113, .08);
            animation: shake .3s ease;
        }

        /* Bit Input */
        .bit-input-row {
            display: flex;
            gap: 5px;
            margin-bottom: 6px;
            flex-wrap: wrap;
            align-items: center;
        }

        .bit-input {
            width: 32px;
            height: 32px;
            font-family: 'Courier New', monospace;
            font-size: 1rem;
            font-weight: bold;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            background: var(--clr-bg);
            color: var(--clr-muted);
            cursor: pointer;
            transition: var(--transition-fast);
            touch-action: manipulation;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .bit-input:hover {
            border-color: var(--clr-accent2);
            background: rgba(56, 189, 248, .1);
        }

        .bit-input.b1 {
            background: var(--clr-text);
            color: var(--clr-bg);
            border-color: var(--clr-text);
        }

        .bit-input.b0 {
            background: var(--clr-bg);
            color: var(--clr-muted);
        }

        /* Feedback */
        .ex-feedback {
            padding: 10px 14px;
            border-radius: 8px;
            font-size: .88rem;
            font-weight: 600;
            margin-top: 10px;
            display: none;
            align-items: center;
            gap: 8px;
        }

        .ex-feedback.show {
            display: flex;
        }

        .ex-feedback.correct {
            background: rgba(52, 211, 153, .1);
            color: var(--success-text);
            border: 1px solid var(--success);
        }

        .ex-feedback.wrong {
            background: rgba(248, 113, 113, .1);
            color: var(--danger-text);
            border: 1px solid var(--danger);
        }

        /* Hint */
        .ex-hint {
            background: rgba(251, 191, 36, .08);
            border: 1px solid rgba(251, 191, 36, .3);
            border-radius: 6px;
            padding: 8px 12px;
            font-size: .82rem;
            color: var(--warning-text);
            margin-top: 8px;
            display: none;
        }

        .ex-hint.show {
            display: block;
        }

        .ex-controls {
            display: flex;
            gap: 8px;
            margin-top: 14px;
            flex-wrap: wrap;
        }

        /* Notes */
        .editable-note {
            font-size: .75rem;
            color: #a78bfa;
            font-weight: 600;
            margin-bottom: 6px;
            padding: 4px 8px;
            background: rgba(167, 139, 250, .1);
            border-radius: 4px;
            display: inline-block;
            border: 1px solid rgba(167, 139, 250, .2);
        }

        .locked-note {
            font-size: .75rem;
            color: var(--clr-accent2-text);
            font-weight: 600;
            margin-bottom: 6px;
            padding: 4px 8px;
            background: rgba(56, 189, 248, .08);
            border-radius: 4px;
            display: inline-block;
            border: 1px solid rgba(56, 189, 248, .2);
        }

        /* Steps */
        .step-indicator {
            display: flex;
            gap: 8px;
            margin-bottom: 12px;
            flex-wrap: wrap;
        }

        .step {
            display: flex;
            align-items: center;
            gap: 5px;
            font-size: .8rem;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 20px;
            background: var(--box-bg);
            color: var(--clr-muted);
            border: 1px solid var(--border-color);
        }

        .step.active-step {
            background: rgba(56, 189, 248, .12);
            color: var(--clr-accent2-text);
            border-color: rgba(56, 189, 248, .3);
        }

        .step.done-step {
            background: rgba(52, 211, 153, .12);
            color: var(--success-text);
            border-color: rgba(52, 211, 153, .3);
        }

        .step-num {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: .72rem;
            font-weight: 800;
            background: var(--clr-muted);
            color: var(--clr-bg);
            flex-shrink: 0;
        }

        .step.active-step .step-num {
            background: var(--clr-accent2);
        }

        .step.done-step .step-num {
            background: var(--success);
        }

        /* Achievement */
        .achievement-banner {
            display: none;
            background: linear-gradient(135deg, var(--warning), #f59e0b);
            color: #0f172a;
            border-radius: 10px;
            padding: 10px 16px;
            margin-bottom: 12px;
            align-items: center;
            gap: 10px;
            font-weight: 600;
            font-size: .9rem;
            animation: slideDown .4s ease;
        }

        .achievement-banner.show {
            display: flex;
        }

        .ach-icon {
            font-size: 1.6rem;
        }

        /* Toast */
        .toast {
            position: fixed;
            bottom: 24px;
            left: 50%;
            transform: translateX(-50%) translateY(20px);
            background: var(--clr-surface);
            color: var(--clr-text);
            border: 1px solid var(--border-color);
            padding: 10px 20px;
            border-radius: 20px;
            font-size: .88rem;
            font-weight: 600;
            opacity: 0;
            transition: all .3s;
            z-index: 1000;
            pointer-events: none;
            box-shadow: var(--shadow-lg);
        }

        .toast.show {
            opacity: 1;
            transform: translateX(-50%) translateY(0);
        }

        .streak-toast {
            position: fixed;
            top: 80px;
            right: 20px;
            background: linear-gradient(135deg, var(--warning), #f59e0b);
            color: #0f172a;
            padding: 12px 18px;
            border-radius: 12px;
            font-weight: 700;
            font-size: .95rem;
            box-shadow: var(--shadow-lg);
            opacity: 0;
            transform: translateX(40px);
            transition: all .4s;
            z-index: 1000;
            pointer-events: none;
        }

        .streak-toast.show {
            opacity: 1;
            transform: translateX(0);
        }

        .score-popup {
            position: fixed;
            pointer-events: none;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--success-text);
            z-index: 9998;
            animation: scoreFloat 1s ease forwards;
        }

        .celebration {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            pointer-events: none;
            z-index: 9999;
        }

        .confetti-piece {
            position: absolute;
            top: 20%;
            animation: confettiFall .8s ease forwards;
        }

        /* Flame */
        .flame {
            display: inline-block;
            animation: flamePulse 1s infinite;
        }

        /* Animations */
        @keyframes slideDown {
            from {
                transform: translateY(-10px);
                opacity: 0;
            }

            to {
                transform: translateY(0);
                opacity: 1;
            }
        }

        @keyframes scoreFloat {
            0% {
                opacity: 1;
                transform: translateY(0);
            }

            100% {
                opacity: 0;
                transform: translateY(-60px);
            }
        }

        @keyframes confettiFall {
            0% {
                transform: translateY(-20px) rotate(0deg);
                opacity: 1;
            }

            100% {
                transform: translateY(80px) rotate(720deg);
                opacity: 0;
            }
        }

        @keyframes flamePulse {

            0%,
            100% {
                transform: scale(1);
            }

            50% {
                transform: scale(1.2);
            }
        }

        @media(max-width:700px) {
            .main-area {
                flex-direction: column;
            }

            .datagram-section {
                width: 100%;
            }

            .full-datagram-wrap {
                flex-direction: column;
            }
        }

        /* Speicherbedarf-Badge */
        .memory-badge {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            background: rgba(167, 139, 250, .12);
            border: 1px solid rgba(167, 139, 250, .3);
            border-radius: 6px;
            padding: 4px 10px;
            font-size: .78rem;
            color: #a78bfa;
            font-weight: 600;
            font-family: monospace;
            margin-top: 6px;
            flex-wrap: wrap;
            line-height: 1.6;
        }

        .memory-badge .mem-item {
            white-space: nowrap;
        }

        .memory-badge .mem-sep {
            color: var(--clr-muted);
            opacity: .5;
        }

        /* Export-Buttons */
        .export-bar {
            display: flex;
            gap: 6px;
            margin-top: 8px;
            flex-wrap: wrap;
            align-items: center;
        }

        .export-bar label,
        .export-bar-label {
            font-size: .75rem;
            color: var(--clr-muted);
            font-weight: 600;
        }

        .btn-export {
            padding: 4px 10px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            cursor: pointer;
            font-size: .75rem;
            font-weight: 600;
            font-family: inherit;
            background: var(--box-bg);
            color: var(--clr-muted);
            transition: var(--transition-fast);
            touch-action: manipulation;
        }

        .btn-export:focus-visible {
            outline: 2px solid var(--clr-accent-text);
            outline-offset: 2px;
        }

        .btn-export:hover {
            border-color: #a78bfa;
            color: #a78bfa;
            background: rgba(167, 139, 250, .08);
        }

        /* Gesamtstatistik */
        .global-stats-bar {
            background: var(--clr-surface);
            border-radius: var(--radius);
            padding: 16px 20px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
            margin: 16px;
            border-left: 4px solid #a78bfa;
        }

        .global-stats-bar h3 {
            font-size: .95rem;
            color: #a78bfa;
            margin-bottom: 12px;
        }

        .global-stats-grid {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            align-items: center;
        }

        .global-stat {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            min-width: 70px;
        }

        .global-stat-val {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1;
            color: #a78bfa;
        }

        .global-stat-label {
            font-size: .68rem;
            color: var(--clr-muted);
            font-weight: 600;
            text-transform: uppercase;
            text-align: center;
        }

        .global-progress-wrap {
            flex: 1;
            min-width: 180px;
        }

        .global-reset-btn {
            margin-left: auto;
        }

        /* Schachbrett-Hintergrund für Transparenz-Vorschau (RGBA) */
        .pixel-canvas-wrap.show-alpha #pixel-grid-color .pixel {
            background-clip: padding-box;
        }

        .pixel-canvas-wrap.show-alpha {
            background-image:
                linear-gradient(45deg, #cbd5e0 25%, transparent 25%),
                linear-gradient(-45deg, #cbd5e0 25%, transparent 25%),
                linear-gradient(45deg, transparent 75%, #cbd5e0 75%),
                linear-gradient(-45deg, transparent 75%, #cbd5e0 75%);
            background-size: 16px 16px;
            background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
            background-color: #ffffff;
            border-radius: 4px;
        }

        /* Im Dark-Mode etwas angepasst */
        html:not([data-theme="light"]) .pixel-canvas-wrap.show-alpha {
            background-image:
                linear-gradient(45deg, #4a5568 25%, transparent 25%),
                linear-gradient(-45deg, #4a5568 25%, transparent 25%),
                linear-gradient(45deg, transparent 75%, #4a5568 75%),
                linear-gradient(-45deg, transparent 75%, #4a5568 75%);
            background-color: #2d3748;
        }

        /* ── Custom Rule Area ── */
        .custom-section {
            margin-bottom: 14px;
            background: var(--clr-bg);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 10px 12px;
        }

        .custom-section-title {
            font-size: .82rem;
            font-weight: 700;
            color: var(--clr-accent2-text);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
        }

        .btn-custom-add {
            padding: 3px 10px;
            border: 1px solid var(--clr-accent);
            border-radius: 12px;
            background: rgba(52, 211, 153, .1);
            color: var(--clr-accent-text);
            font-size: .75rem;
            font-weight: 600;
            cursor: pointer;
            font-family: inherit;
            transition: var(--transition-fast);
        }

        .btn-custom-add:hover {
            background: rgba(52, 211, 153, .25);
        }

        .custom-payload-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
        }

        @media(max-width:600px) {
            .custom-payload-grid {
                grid-template-columns: 1fr;
            }
        }

        .custom-field {
            display: flex;
            flex-direction: column;
            gap: 3px;
        }

        .custom-field label {
            font-size: .75rem;
            font-weight: 600;
            color: var(--clr-muted);
        }

        .custom-field select,
        .custom-field input[type=text],
        .custom-field input[type=number] {
            padding: 5px 8px;
            border: 1px solid var(--border-color);
            border-radius: 6px;
            font-size: .82rem;
            background: var(--clr-surface);
            color: var(--clr-text);
            font-family: inherit;
        }

        .custom-field-hint {
            font-size: .68rem;
            color: var(--clr-muted);
            opacity: .75;
            line-height: 1.3;
        }

        /* Header/Payload-Byte-Zeilen */
        .custom-byte-row {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 6px 8px;
            background: var(--clr-surface);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            margin-bottom: 5px;
            flex-wrap: wrap;
        }

        .custom-byte-num {
            font-size: .72rem;
            font-weight: 700;
            color: var(--clr-accent2-text);
            min-width: 46px;
            font-family: monospace;
        }

        .custom-byte-row select {
            flex: 1;
            min-width: 130px;
            padding: 4px 7px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            font-size: .78rem;
            background: var(--clr-bg);
            color: var(--clr-text);
            font-family: inherit;
        }

        .custom-byte-row input[type=text],
        .custom-byte-row input[type=number] {
            width: 80px;
            padding: 4px 7px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            font-size: .78rem;
            background: var(--clr-bg);
            color: var(--clr-text);
            font-family: monospace;
        }

        .custom-byte-desc {
            font-size: .68rem;
            color: var(--clr-muted);
            min-width: 100px;
            flex: 2;
        }

        .btn-custom-remove {
            padding: 3px 8px;
            border: 1px solid var(--danger);
            border-radius: 5px;
            background: rgba(248, 113, 113, .1);
            color: var(--danger-text);
            font-size: .75rem;
            cursor: pointer;
            font-family: inherit;
            flex-shrink: 0;
            transition: var(--transition-fast);
        }

        .btn-custom-remove:hover {
            background: rgba(248, 113, 113, .25);
        }

        .btn-custom-remove:disabled {
            opacity: .35;
            cursor: default;
        }

        /* Bit-Zellen für Schwarz/Weiß-Code */
        .custom-bit-cells {
            display: flex;
            gap: 3px;
        }

        .custom-bit-cell {
            width: 28px;
            height: 28px;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: monospace;
            font-size: .95rem;
            font-weight: bold;
            cursor: pointer;
            transition: var(--transition-fast);
            background: var(--clr-bg);
            color: var(--clr-muted);
            touch-action: manipulation;
            user-select: none;
        }

        .custom-bit-cell.active {
            background: var(--clr-text);
            color: var(--clr-bg);
            border-color: var(--clr-text);
        }

        .custom-code-val {
            font-size: .75rem;
            font-family: monospace;
            color: var(--clr-accent2-text);
            font-weight: 600;
            min-width: 30px;
        }

        /* Vorschrift-Vorschau */
        .custom-preview-box {
            background: var(--clr-bg);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 10px 14px;
            font-size: .78rem;
            font-family: monospace;
            line-height: 2;
            color: var(--clr-text);
            white-space: pre-wrap;
            word-break: break-all;
        }

        .custom-hint {
            font-size: .7rem;
            color: var(--clr-muted);
            margin-top: 5px;
            opacity: .8;
        }

        /* Gesperrte Bit-Zelle im Header */
        .bit-cell.locked-bit {
            opacity: 0.3;
            cursor: not-allowed;
            pointer-events: none;
        }

        /* Aktive editierbare Bit-Zelle */
        .bit-cell.editable-bit {
            border-left: 1px solid rgba(56, 189, 248, .3);
        }

        /* Trennlinie zwischen gesperrtem und editierbarem Nibble */
        .bit-cell.nibble-sep {
            border-left: 2px solid var(--clr-accent2) !important;
        }

        .size-warning {
            background: rgba(251, 191, 36, .1);
            border: 1px solid rgba(251, 191, 36, .4);
            border-radius: 6px;
            padding: 6px 12px;
            font-size: .78rem;
            color: var(--warning-text);
            font-weight: 600;
            margin-bottom: 6px;
        }

        /* ══ WORKSHEET GENERATOR ══ */
        .ws-section {
            background: var(--clr-surface);
            border-radius: var(--radius);
            padding: 18px 20px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
            margin-bottom: 16px;
        }

        .ws-section h3 {
            font-size: .95rem;
            font-weight: 700;
            color: var(--clr-accent2-text);
            margin-bottom: 14px;
            padding-bottom: 6px;
            border-bottom: 2px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .ws-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
        }

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

        .ws-field {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .ws-field label {
            font-size: .78rem;
            font-weight: 600;
            color: var(--clr-muted);
        }

        .ws-field input[type=text],
        .ws-field input[type=number],
        .ws-field select,
        .ws-field textarea {
            padding: 7px 10px;
            border: 1px solid var(--border-color);
            border-radius: 7px;
            font-size: .85rem;
            background: var(--clr-bg);
            color: var(--clr-text);
            font-family: inherit;
            width: 100%;
            box-sizing: border-box;
        }

        .ws-field textarea {
            resize: vertical;
            min-height: 54px;
        }

        .ws-field input:focus,
        .ws-field select:focus,
        .ws-field textarea:focus {
            outline: none;
            border-color: var(--clr-accent2);
        }

        .ws-field-hint {
            font-size: .68rem;
            color: var(--clr-muted);
            opacity: .75;
        }

        /* Task-Auswahl */
        .ws-task-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 10px;
            margin-top: 4px;
        }

        .ws-task-card {
            border: 2px solid var(--border-color);
            border-radius: 10px;
            padding: 12px 14px;
            cursor: pointer;
            transition: var(--transition-fast);
            background: var(--clr-bg);
            user-select: none;
        }

        .ws-task-card:hover {
            border-color: var(--clr-accent2);
            background: rgba(56, 189, 248, .05);
        }

        .ws-task-card.selected {
            border-color: var(--clr-accent2);
            background: rgba(56, 189, 248, .10);
        }

        .ws-task-card-header {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 6px;
        }

        .ws-task-check {
            width: 18px;
            height: 18px;
            border: 2px solid var(--border-color);
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: .75rem;
            flex-shrink: 0;
            transition: var(--transition-fast);
            background: var(--clr-bg);
        }

        .ws-task-card.selected .ws-task-check {
            background: var(--clr-accent2);
            border-color: var(--clr-accent2);
            color: #0f172a;
        }

        .ws-task-title {
            font-size: .85rem;
            font-weight: 700;
            color: var(--clr-text);
        }

        .ws-task-desc {
            font-size: .72rem;
            color: var(--clr-muted);
            line-height: 1.5;
        }

        .ws-diff-row {
            display: flex;
            gap: 5px;
            margin-top: 7px;
            flex-wrap: wrap;
        }

        .ws-diff-chip {
            padding: 2px 8px;
            border: 1px solid var(--border-color);
            border-radius: 10px;
            font-size: .68rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition-fast);
            background: var(--clr-bg);
            color: var(--clr-muted);
            user-select: none;
        }

        .ws-diff-chip.active-easy {
            background: var(--success);
            border-color: var(--success);
            color: #0f172a;
        }

        .ws-diff-chip.active-medium {
            background: var(--warning);
            border-color: var(--warning);
            color: #0f172a;
        }

        .ws-diff-chip.active-hard {
            background: var(--danger);
            border-color: var(--danger);
            color: #fff;
        }

        .ws-diff-chip.active-expert {
            background: #a78bfa;
            border-color: #a78bfa;
            color: #0f172a;
        }

        .ws-count-row {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-top: 7px;
            font-size: .75rem;
            color: var(--clr-muted);
        }

        .ws-count-row input[type=number] {
            width: 52px;
            padding: 3px 6px;
            border: 1px solid var(--border-color);
            border-radius: 5px;
            font-size: .82rem;
            background: var(--clr-bg);
            color: var(--clr-text);
            font-family: monospace;
            text-align: center;
        }

        /* Vorschau */
        .ws-preview-wrap {
            background: #ffffff;
            border: 1px solid #cbd5e0;
            border-radius: 8px;
            padding: 0;
            overflow: hidden;
            box-shadow: 0 4px 24px rgba(0, 0, 0, .12);
            max-width: 760px;
            margin: 0 auto;
        }

        .ws-preview-inner {
            padding: 28px 36px;
            font-family: 'Segoe UI', Arial, sans-serif;
            font-size: 11pt;
            color: #1a202c;
            background: #ffffff;
            min-height: 400px;
        }

        .ws-preview-header {
            border-bottom: 2px solid #2d3748;
            padding-bottom: 10px;
            margin-bottom: 18px;
        }

        .ws-preview-title {
            font-size: 16pt;
            font-weight: 800;
            color: #1a202c;
            margin-bottom: 4px;
        }

        .ws-preview-subtitle {
            font-size: 10pt;
            color: #4a5568;
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .ws-preview-meta {
            display: flex;
            justify-content: space-between;
            font-size: 9pt;
            color: #718096;
            margin-top: 4px;
        }

        .ws-preview-footer {
            border-top: 1px solid #cbd5e0;
            margin-top: 20px;
            padding-top: 8px;
            font-size: 8.5pt;
            color: #718096;
            display: flex;
            justify-content: space-between;
        }

        /* Aufgaben im Arbeitsblatt */
        .ws-task-block {
            margin-bottom: 22px;
            page-break-inside: avoid;
            break-inside: avoid;
        }

        .ws-task-num {
            font-size: 11pt;
            font-weight: 700;
            color: #2d3748;
            margin-bottom: 5px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .ws-task-num .ws-badge {
            font-size: 7.5pt;
            padding: 1px 7px;
            border-radius: 10px;
            font-weight: 600;
        }

        .ws-badge-easy {
            background: #c6f6d5;
            color: #276749;
        }

        .ws-badge-medium {
            background: #fefcbf;
            color: #744210;
        }

        .ws-badge-hard {
            background: #fed7d7;
            color: #9b2c2c;
        }

        .ws-badge-expert {
            background: #e9d8fd;
            color: #553c9a;
        }

        .ws-badge-bw {
            background: #e2e8f0;
            color: #2d3748;
        }

        .ws-badge-gs {
            background: #ebf8ff;
            color: #2c5282;
        }

        .ws-badge-color {
            background: #fff5f5;
            color: #9b2c2c;
        }

        .ws-task-question {
            font-size: 10.5pt;
            color: #2d3748;
            margin-bottom: 8px;
            line-height: 1.6;
        }

        /* Pixel-Raster für Arbeitsblatt */
        .ws-pixel-grid-wrap {
            margin: 8px 0;
            display: inline-block;
        }

        .ws-pixel-table {
            border-collapse: collapse;
            border: 2px solid #2d3748;
        }

        .ws-pixel-table td {
            width: 20px;
            height: 20px;
            border: 1px solid #a0aec0;
            box-sizing: border-box;
        }

        .ws-pixel-table td.black {
            background: #1a202c;
        }

        .ws-pixel-table td.white {
            background: #ffffff;
        }

        .ws-pixel-table td.empty {
            background: #ffffff;
        }

        /* Datagramm für Arbeitsblatt */
        .ws-datagram-table {
            border-collapse: collapse;
            font-family: 'Courier New', monospace;
            font-size: 8.5pt;
            margin: 6px 0;
            width: 100%;
        }

        .ws-datagram-table th {
            background: #edf2f7;
            padding: 3px 5px;
            border: 1px solid #cbd5e0;
            font-size: 7.5pt;
            color: #4a5568;
            text-align: center;
        }

        .ws-datagram-table td {
            padding: 3px 5px;
            border: 1px solid #cbd5e0;
            text-align: center;
            font-size: 9pt;
        }

        .ws-datagram-table .bit-1 {
            background: #1a202c;
            color: #ffffff;
            font-weight: bold;
        }

        .ws-datagram-table .bit-0 {
            background: #ffffff;
            color: #1a202c;
        }

        .ws-datagram-table .bit-blank {
            background: #f7fafc;
            color: transparent;
            min-width: 18px;
        }

        .ws-datagram-table .lbl-header {
            background: #ebf8ff;
            color: #2c5282;
            font-weight: 700;
            font-size: 7pt;
            text-align: left;
            white-space: nowrap;
        }

        .ws-datagram-table .lbl-payload {
            background: #f0fff4;
            color: #276749;
            font-weight: 700;
            font-size: 7pt;
            text-align: left;
            white-space: nowrap;
        }

        /* Antwortfelder */
        .ws-answer-box {
            border: 1.5px solid #cbd5e0;
            border-radius: 5px;
            background: #f7fafc;
            padding: 6px 10px;
            min-height: 36px;
            margin-top: 5px;
            font-family: monospace;
            font-size: 9pt;
            color: transparent;
            /* Antwort unsichtbar */
            position: relative;
        }

        .ws-answer-lines {
            margin-top: 5px;
        }

        .ws-answer-line {
            border-bottom: 1px solid #a0aec0;
            height: 24px;
            margin-bottom: 4px;
        }

        /* Lösungsseite */
        .ws-solution-page {
            page-break-before: always;
            break-before: page;
            padding-top: 10px;
        }

        .ws-solution-title {
            font-size: 13pt;
            font-weight: 800;
            color: #2d3748;
            border-bottom: 2px solid #a0aec0;
            padding-bottom: 8px;
            margin-bottom: 14px;
        }

        .ws-solution-item {
            margin-bottom: 10px;
            padding: 6px 10px;
            background: #f7fafc;
            border-left: 3px solid #38a169;
            border-radius: 0 5px 5px 0;
            font-size: 9.5pt;
        }

        .ws-solution-item .sol-num {
            font-weight: 700;
            color: #2d3748;
            margin-bottom: 3px;
        }

        .ws-solution-item .sol-ans {
            font-family: monospace;
            color: #276749;
        }

        /* Generator-Controls */
        .ws-action-bar {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            align-items: center;
            margin-bottom: 16px;
        }

        .ws-status {
            font-size: .82rem;
            color: var(--clr-muted);
            margin-left: auto;
        }

        .ws-status.ready {
            color: var(--success-text);
            font-weight: 600;
        }

        /* Tabs innerhalb des Generators */
        .ws-inner-tabs {
            display: flex;
            gap: 4px;
            margin-bottom: 16px;
            border-bottom: 2px solid var(--border-color);
            padding-bottom: 0;
        }

        .ws-inner-tab {
            padding: 7px 14px;
            border: none;
            background: transparent;
            color: var(--clr-muted);
            cursor: pointer;
            font-size: .83rem;
            font-weight: 600;
            border-bottom: 3px solid transparent;
            margin-bottom: -2px;
            font-family: inherit;
            transition: var(--transition-fast);
        }

        .ws-inner-tab.active {
            color: var(--clr-accent2-text);
            border-bottom-color: var(--clr-accent2);
        }

        .ws-inner-tab:hover {
            color: var(--clr-text);
        }

        .ws-inner-panel {
            display: none;
        }

        .ws-inner-panel.active {
            display: block;
        }

        /* Trennlinie Aufgaben */
        .ws-task-sep {
            border: none;
            border-top: 1px dashed #cbd5e0;
            margin: 14px 0;
        }

        /* ══ CUSTOM EXAMPLES UPLOAD ══ */
        .custom-examples-wrap {
            margin-top: 10px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            background: var(--box-bg);
            padding: 10px 12px;
        }

        .custom-examples-title {
            font-size: .78rem;
            font-weight: 700;
            color: var(--clr-accent2-text);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .custom-examples-dropzone {
            border: 2px dashed var(--border-color);
            border-radius: 8px;
            padding: 14px 10px;
            text-align: center;
            color: var(--clr-muted);
            font-size: .8rem;
            cursor: pointer;
            transition: var(--transition-fast);
            background: var(--clr-bg);
            position: relative;
        }

        .custom-examples-dropzone:hover,
        .custom-examples-dropzone.dragover {
            border-color: var(--clr-accent2);
            background: rgba(56, 189, 248, .06);
            color: var(--clr-accent2-text);
        }

        .custom-examples-dropzone input[type=file] {
            position: absolute;
            inset: 0;
            opacity: 0;
            cursor: pointer;
            width: 100%;
            height: 100%;
        }

        .custom-examples-dropzone .dz-icon {
            font-size: 1.6rem;
            display: block;
            margin-bottom: 4px;
        }

        .custom-examples-dropzone .dz-hint {
            font-size: .72rem;
            color: var(--clr-muted);
            margin-top: 3px;
        }

        .custom-examples-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 10px;
            min-height: 0;
        }

        .custom-example-thumb {
            position: relative;
            border: 2px solid var(--border-color);
            border-radius: 6px;
            overflow: hidden;
            cursor: pointer;
            transition: var(--transition-fast);
            background: var(--clr-bg);
            display: flex;
            flex-direction: column;
            align-items: center;
            width: 72px;
        }

        .custom-example-thumb:hover {
            border-color: var(--clr-accent2);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        .custom-example-thumb canvas {
            display: block;
            width: 68px;
            height: 68px;
            image-rendering: pixelated;
        }

        .custom-example-thumb .thumb-label {
            font-size: .6rem;
            color: var(--clr-muted);
            padding: 2px 4px;
            text-align: center;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            width: 100%;
            box-sizing: border-box;
            background: var(--clr-surface);
        }

        .custom-example-thumb .thumb-del {
            position: absolute;
            top: 2px;
            right: 2px;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: rgba(248, 113, 113, .85);
            color: #fff;
            font-size: .6rem;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity .15s;
            padding: 0;
            line-height: 1;
        }

        .custom-example-thumb:hover .thumb-del {
            opacity: 1;
        }

        .custom-example-thumb.active-thumb {
            border-color: var(--clr-accent2);
            box-shadow: 0 0 0 2px rgba(56, 189, 248, .35);
        }
    
        /* Kontrast-Korrekturen (WCAG AA, 2026-10-07): gleiche Farbtöne, nur dunkler bzw. heller */
        html:not([data-theme="light"]) .memory-badge { color: #ab90fa; }  /* statt #a78bfa */
        html[data-theme="light"] .global-stats-bar h3 { color: #7e55f8; }  /* statt #a78bfa */
        html[data-theme="light"] .memory-badge { color: #7347f7; }  /* statt #a78bfa */
    

        /* Export-Fenster (Bild / Datagramm) */
        .export-dialog-box {
            max-width: 960px;
        }

        .export-layout {
            display: grid;
            grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
            gap: 16px;
            align-items: start;
        }

        .export-optionen {
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 10px 12px;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .export-optionen legend {
            font-weight: 700;
            padding: 0 4px;
        }

        .export-option {
            display: flex;
            gap: 8px;
            align-items: center;
            font-size: .9rem;
            cursor: pointer;
        }

        .export-option input[type="checkbox"] {
            width: 18px;
            height: 18px;
            flex: none;
        }

        .export-groesse select {
            font: inherit;
        }

        .export-hinweis {
            font-size: .8rem;
            color: var(--clr-muted);
            margin: 4px 0;
        }

        .export-optionen .btn-export {
            align-self: flex-start;
            margin-top: 4px;
        }

        .export-vorschau-wrap {
            border: 1px dashed var(--border-color);
            border-radius: 8px;
            padding: 10px;
            max-height: 55vh;
            overflow: auto;
            background-color: #e2e8f0;
            background-image: linear-gradient(45deg, #cbd5e0 25%, transparent 25%, transparent 75%, #cbd5e0 75%),
                linear-gradient(45deg, #cbd5e0 25%, transparent 25%, transparent 75%, #cbd5e0 75%);
            background-size: 16px 16px;
            background-position: 0 0, 8px 8px;
            text-align: center;
        }

        .export-vorschau-wrap img {
            max-width: 100%;
            height: auto;
        }

        .export-vorschau-wrap img.pixelig {
            image-rendering: pixelated;
        }

        .export-aktionen {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 12px;
        }

        /* Meldungen auch über dem Export-Fenster zeigen */
        .toast {
            z-index: 2100;
        }

        @media (max-width: 700px) {
            .export-layout {
                grid-template-columns: minmax(0, 1fr);
            }
        }