:root {
            --bg-primary: #f3e9f9;
            --container-bg: #ffffff;
            --text-color: #2c3e50;
            --accent-green: #2ecc71;
            --accent-red: #ff7675;
            --accent-purple: #9b59b6;
            --parent-panel: #ffeaa7;
            --sandbox-bg: #fdf7ff;
            --basket-bg: #fffbf0;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Comic Sans MS', 'Chalkboard SE', sans-serif;
        }

        body {
            background-color: var(--bg-primary);
            color: var(--text-color);
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 80px 20px 20px 20px;
        }

        .game-window {
            background: var(--container-bg);
            border-radius: 24px;
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            width: 100%;
            max-width: 855px;
            padding: 30px;
            text-align: center;
            border: 6px solid #e8d0f5;
        }

        /* Parent Dashboard Configuration */
        .parent-config {
            background-color: var(--parent-panel);
            border: 3px dashed #d35400;
            border-radius: 16px;
            padding: 15px;
            margin-bottom: 25px;
        }

        .parent-title {
            font-size: 0.9rem;
            font-weight: bold;
            color: #d35400;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 12px;
        }

        .parent-settings-row {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        .parent-input-group {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .parent-input {
            height: 38px;
            font-size: 1rem;
            padding: 5px 10px;
            border: 2px solid #d35400;
            border-radius: 8px;
            outline: none;
        }
        
        .parent-input.name-input { width: 140px; }
        .parent-input.num-input { width: 65px; text-align: center; }

        .emoji-selector {
            display: flex;
            gap: 8px;
        }

        .emoji-opt {
            font-size: 1.6rem;
            background: white;
            border: 3px solid #ccc;
            border-radius: 12px;
            width: 44px;
            height: 44px;
            cursor: pointer;
            display: flex;
            justify-content: center;
            align-items: center;
            transition: all 0.2s ease;
        }

        .emoji-opt.selected {
            border-color: #e67e22;
            background-color: #fff2cc;
            transform: scale(1.1);
        }

        .btn-parent-load {
            background-color: #e67e22;
            color: white;
            border: none;
            padding: 8px 14px;
            font-weight: bold;
            border-radius: 8px;
            cursor: pointer;
            box-shadow: 0 3px #b35b10;
        }
        .btn-parent-load:active {
            transform: translateY(2px);
            box-shadow: 0 1px #b35b10;
        }

        /* Live Scoreboards Header */
        .game-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .badge {
            padding: 8px 16px;
            border-radius: 12px;
            font-weight: bold;
            font-size: 1.1rem;
            background-color: #f1f2f6;
        }
        .q-badge { background-color: #a29bfe; color: white; }
        .score-badge { background-color: #fdcb6e; color: #2c3e50; }
        
        .child-greeting {
            font-size: 1.6rem;
            color: var(--accent-purple);
            font-weight: bold;
            margin-bottom: 15px;
        }

        /* Vertical Math Layout Framework */
        .worksheet-grid {
            display: grid;
            grid-template-columns: 80px 120px auto;
            align-items: center;
            max-width: 780px;
            margin: 0 auto 25px auto;
        }

        .column-math-stack {
            grid-column: 1 / span 2;
            display: grid;
            grid-template-columns: 60px 140px;
            align-items: center;
            row-gap: 15px;
        }

        .math-sign {
            font-size: 4rem;
            font-weight: bold;
            color: #7f8c8d;
            text-align: center;
        }

        .big-number {
            font-size: 5.5rem;
            font-weight: bold;
            color: var(--text-color);
            text-align: center;
            background: #f1f2f6;
            border-radius: 16px;
            padding: 5px 15px;
            box-shadow: 0 4px 6px rgba(0,0,0,0.05);
            margin-right: 20px;
        }

        /* Multiplication Master Sandbox */
        .sandbox-box {
            grid-column: 3;
            grid-row: 1 / span 2;
            background-color: var(--sandbox-bg);
            border: 4px solid var(--accent-purple);
            border-radius: 20px;
            padding: 15px;
            height: 100%;
            min-height: 260px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            box-shadow: 0 6px 12px rgba(0,0,0,0.05);
        }

        /* Holds individual baskets dynamic container layout */
        .baskets-grid {
            flex-grow: 1;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            align-content: center;
            margin-bottom: 15px;
        }

        .group-basket {
            background-color: var(--basket-bg);
            border: 3px dashed #95a5a6;
            border-radius: 16px;
            padding: 10px;
            min-width: 100px;
            min-height: 100px;
            display: flex;
            flex-wrap: wrap;
            align-content: center;
            justify-content: center;
            gap: 6px;
            position: relative;
            box-shadow: inset 0 2px 5px rgba(0,0,0,0.05);
        }

        .basket-label {
            position: absolute;
            bottom: -3px;
            right: 5px;
            font-size: 0.75rem;
            font-weight: bold;
            color: #bdc3c7;
        }

        .sandbox-emoji {
            font-size: 2rem;
            user-select: none;
            animation: popIn 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
        }

        @keyframes popIn {
            0% { transform: scale(0); }
            100% { transform: scale(1); }
        }

        .sandbox-controls {
            display: flex;
            justify-content: center;
            gap: 12px;
        }

        .btn-action {
            border: none;
            color: white;
            font-size: 0.95rem;
            font-weight: bold;
            padding: 10px 18px;
            border-radius: 50px;
            cursor: pointer;
            transition: transform 0.1s ease, box-shadow 0.1s ease;
            white-space: nowrap;
        }
        .btn-add { background-color: var(--accent-green); box-shadow: 0 4px #27ae60; }
        .btn-remove { background-color: var(--accent-red); box-shadow: 0 4px #c0392b; }
        .btn-action:active { transform: translateY(3px); box-shadow: 0 1px transparent; }

        /* Worksheet Equals Divider Bar Line */
        .worksheet-line {
            grid-column: 1 / span 3;
            height: 6px;
            background-color: var(--text-color);
            border-radius: 3px;
            margin: 20px 0;
        }

        /* Bottom Row Answer Container */
        .answer-row-wrapper {
            grid-column: 1 / span 3;
            display: flex;
            justify-content: flex-start;
            align-items: center;
            padding-left: 60px;
            gap: 25px;
        }

        .input-label {
            font-size: 1.3rem;
            font-weight: bold;
            color: var(--text-color);
        }

        .input-box {
            width: 100px;
            height: 65px;
            font-size: 2.5rem;
            text-align: center;
            border: 3px solid var(--accent-purple);
            border-radius: 12px;
            color: var(--text-color);
            outline: none;
        }
        .btn-submit {
            background-color: var(--accent-purple);
            box-shadow: 0 5px #7d3c98;
            font-size: 1.3rem;
            padding: 14px 30px;
            border-radius: 50px;
        }

        /* Success Modals */
        .modal-screen {
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.5);
            display: none;
            justify-content: center;
            align-items: center;
            z-index: 100;
        }
        .modal-card {
            background: white;
            padding: 40px;
            border-radius: 24px;
            text-align: center;
            width: 90%;
            max-width: 400px;
        }
        .modal-card h2 { font-size: 2.2rem; color: var(--accent-green); margin-bottom: 10px; }
        .modal-card p { font-size: 1.2rem; margin-bottom: 20px; }

        /* Responsive Adjustments */
        @media (max-width: 768px) {
            body {
                padding: 100px 10px 20px 10px;
            }

            .game-window {
                padding: 15px;
            }

            .child-greeting {
                font-size: 1.3rem;
            }

            .badge {
                font-size: 0.9rem;
                padding: 6px 10px;
            }

            .worksheet-grid {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .column-math-stack {
                grid-column: 1;
                grid-template-columns: 50px 1fr;
                justify-items: center;
            }

            .big-number {
                font-size: 3.5rem;
                margin-right: 10px;
            }

            .math-sign {
                font-size: 3rem;
            }

            .sandbox-box {
                grid-column: 1;
                grid-row: auto;
                min-height: 200px;
                padding: 15px;
            }

            .group-basket {
                min-width: 80px;
                min-height: 80px;
            }

            .sandbox-emoji {
                font-size: 1.5rem;
            }

            .answer-row-wrapper {
                padding-left: 0;
                justify-content: center;
                gap: 15px;
            }

            .input-box {
                width: 80px;
                height: 55px;
                font-size: 2rem;
            }

            .btn-submit {
                padding: 10px 20px;
                font-size: 1.1rem;
            }
        }

        @media (max-width: 480px) {
            .parent-settings-row {
                flex-direction: column;
                gap: 10px;
            }

            .emoji-selector {
                order: -1;
            }

            .big-number {
                font-size: 2.5rem;
            }

            .math-sign {
                font-size: 2.5rem;
            }

            .sandbox-controls {
                flex-wrap: wrap;
            }

            .btn-action {
                font-size: 0.85rem;
                padding: 8px 12px;
            }
        }