 /* Base styles */
        :root {
            --primary-color: #3b669d;
            --primary-hover: #4b77ae;
            --background-dark: #181f28;
            --panel-dark: #242c3b;
            --border-dark: #2a3545;
            --text-light: #e0e0e0;
            --success-color: #4CAF50;
            --highlight-color: #ff4500;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: var(--background-dark);
            color: var(--text-light);
            line-height: 1.6;
            transition: all 0.3s ease;
            padding: 1rem;
        }

        h1,
        h2,
        h3 {
            color: var(--primary-hover);
            text-align: center;
            margin-bottom: 0.5rem;
            animation: fadeIn 0.8s ease-in-out;
        }

        .ppx-header-container {
            /* Will center horizontally in any parent div */
            display: block;
            width: 100%;
            text-align: center;
            /* Self-contained styles */
            font-family: 'Courier New', monospace;
            padding: 20px 0;
            position: relative;
            overflow: hidden;
        }

        .ppx-header-glitch {
            font-size: 3rem;
            font-weight: bold;
            position: relative;
            display: inline-block;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--text-light, #e0e0e0);
            text-shadow:
                0 0 5px var(--primary-color, #3b669d),
                0 0 10px var(--primary-hover, #4b77ae);
            margin: 0;
            padding: 10px;
        }

        .ppx-header-glitch::before,
        .ppx-header-glitch::after {
            content: "PP-X Web v2";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            overflow: hidden;
            background: transparent;
            padding: 10px;
        }

        .ppx-header-glitch::before {
            left: 3px;
            text-shadow: -2px 0 #00e5ff;
            animation: glitch-anim-1 2s infinite linear alternate-reverse;
            clip-path: polygon(0 0, 100% 0, 100% 45%, 0 45%);
            -webkit-clip-path: polygon(0 0, 100% 0, 100% 45%, 0 45%);
        }

        .ppx-header-glitch::after {
            left: -3px;
            text-shadow: 2px 0 var(--success-color, #4CAF50);
            animation: glitch-anim-2 3s infinite linear alternate-reverse;
            clip-path: polygon(0 55%, 100% 55%, 100% 100%, 0 100%);
            -webkit-clip-path: polygon(0 55%, 100% 55%, 100% 100%, 0 100%);
        }

        .ppx-binary-rain {
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: -1;
            opacity: 0.2;
        }

        .ppx-matrix-char {
            position: absolute;
            color: var(--primary-color, #3b669d);
            font-family: 'Courier New', monospace;
            font-size: 14px;
            line-height: 1;
            user-select: none;
            white-space: nowrap;
        }

        .ppx-scanning-line {
            position: absolute;
            height: 2px;
            width: 100%;
            background: #00e5ff;
            box-shadow: 0 0 10px 3px #00e5ff;
            opacity: 0.7;
            top: 50%;
            left: 0;
            animation: scanning 3s infinite;
        }

        .ppx-header-border {
            position: absolute;
            inset: 0;
            border: 2px solid var(--border-dark, #2a3545);
            pointer-events: none;
            animation: border-pulse 4s infinite;
        }

        @keyframes scanning {

            0%,
            100% {
                top: 0;
            }

            50% {
                top: 100%;
            }
        }

        @keyframes glitch-anim-1 {

            0%,
            100% {
                transform: translateX(0);
            }

            5%,
            30% {
                transform: translateX(-5px);
            }

            10%,
            25% {
                transform: translateX(5px);
            }

            15% {
                transform: translateX(-5px);
            }

            20% {
                transform: translateX(5px);
            }
        }

        @keyframes glitch-anim-2 {

            0%,
            100% {
                transform: translateX(0);
            }

            5%,
            30% {
                transform: translateX(5px);
            }

            10%,
            25% {
                transform: translateX(-5px);
            }

            15% {
                transform: translateX(5px);
            }

            20% {
                transform: translateX(-5px);
            }
        }

        @keyframes border-pulse {

            0%,
            100% {
                box-shadow: 0 0 0 rgba(0, 229, 255, 0);
            }

            50% {
                box-shadow: 0 0 15px rgba(0, 229, 255, 0.7);
            }
        }

        .ppx-terminal-line {
            position: absolute;
            bottom: 8px;
            width: 100%;
            font-family: 'Courier New', monospace;
            font-size: 12px;
            color: var(--primary-hover, #4b77ae);
            text-align: center;
            white-space: nowrap;
            overflow: hidden;
            opacity: 0.8;
        }

        .ppx-terminal-text {
            display: inline-block;
            white-space: nowrap;
            animation: typing 8s steps(60) infinite;
        }

        @keyframes typing {
            0% {
                width: 0;
            }

            40% {
                width: 100%;
            }

            60% {
                width: 100%;
            }

            100% {
                width: 0;
            }
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
        }

        /* Header section */
        .app-header {
            text-align: center;
            margin-bottom: 1rem;
            animation: slideDown 0.5s ease-in-out;
        }

        @keyframes slideDown {
            from {
                transform: translateY(-20px);
                opacity: 0;
            }

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

        @keyframes fadeIn {
            from {
                opacity: 0;
            }

            to {
                opacity: 1;
            }
        }

        /* Game grid section */
        .game-section {
            display: flex;
            flex-direction: column;
            align-items: center;
            animation: fadeIn 0.8s ease-in-out;
        }

        .game-container {
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        /* Make the grid container smaller */
        .grid-container {
            width: 100%;
            max-width: min(60vw, 60vh);
            /* Reduced from 80vw/80vh */
            aspect-ratio: 1;
            margin: 1rem auto;
        }

        #grid {
            width: 100%;
            aspect-ratio: 1;
            border-collapse: collapse;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
            border-radius: 8px;
            overflow: hidden;
        }

        td {
            position: relative;
            border: 1px solid var(--border-dark);
            text-align: center;
            cursor: pointer;
            transition: background-color 0.2s, transform 0.2s;
        }

        td:before {
            content: "";
            display: block;
            padding-top: 100%;
        }

        /* Ensure circles are in the middle */
        td>* {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        td:hover {
            background-color: rgba(255, 255, 255, 0.1);
            transform: scale(1.05);
        }

        /* Enhanced circle styling with animation */
        .circle {
            position: relative;
            width: 75%;
            height: 75%;
            border-radius: 50%;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
            transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                box-shadow 0.3s ease;
            animation: popIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }

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

            70% {
                transform: scale(1.1);
            }

            100% {
                transform: scale(1);
                opacity: 1;
            }
        }

        td:hover .circle {
            transform: scale(1.1);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
        }

        .circle:active {
            transform: scale(0.95);
        }

        .color-0 {
            background-color: #2d2d2d;
        }

        .color-1 {
            background-color: #4d7bd6;
            background-image: linear-gradient(135deg, #4d7bd6, #3b69d0);
        }

        .color-2 {
            background-color: #ff5c91;
            background-image: linear-gradient(135deg, #ff5c91, #ff4483);
        }

        .color-3 {
            background-color: #9c5dd5;
            background-image: linear-gradient(135deg, #9c5dd5, #8a4bc4);
        }

        .empty {
            background-color: var(--border-dark);
            animation: pulseEmpty 2s infinite alternate;
        }

        @keyframes pulseEmpty {
            from {
                opacity: 0.7;
            }

            to {
                opacity: 1;
            }
        }

        /* Mode controls with animations */
        .mode-controls {
            display: flex;
            gap: 0.5rem;
            justify-content: center;
            margin-bottom: 1rem;
            flex-wrap: wrap;
            animation: fadeIn 0.8s ease-in-out 0.2s both;
        }

        .instructions {
            text-align: center;
            margin-bottom: 1rem;
            padding: 0 1rem;
            animation: fadeIn 0.8s ease-in-out 0.3s both;
        }

        /* Enhanced buttons with animations */
        button,
        .mode-btn,
        .control-btn {
            padding: 0.5rem 1rem;
            font-size: 0.9rem;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.2s ease;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
            animation: fadeIn 0.5s ease-in-out;
            position: relative;
            overflow: hidden;
        }

        button:after,
        .mode-btn:after,
        .control-btn:after {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            width: 5px;
            height: 5px;
            background: rgba(255, 255, 255, 0.5);
            opacity: 0;
            border-radius: 100%;
            transform: scale(1, 1) translate(-50%);
            transform-origin: 50% 50%;
        }

        button:focus:not(:active):after,
        .mode-btn:focus:not(:active):after,
        .control-btn:focus:not(:active):after {
            animation: ripple 1s ease-out;
        }

        @keyframes ripple {
            0% {
                transform: scale(0, 0);
                opacity: 0.5;
            }

            20% {
                transform: scale(25, 25);
                opacity: 0.3;
            }

            100% {
                opacity: 0;
                transform: scale(40, 40);
            }
        }

        button:hover,
        .mode-btn:hover,
        .control-btn:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
        }

        button:active,
        .mode-btn:active,
        .control-btn:active {
            transform: translateY(0);
            box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
        }

        .mode-btn.active {
            background-color: var(--success-color);
            color: white;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% {
                box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.4);
            }

            70% {
                box-shadow: 0 0 0 10px rgba(76, 175, 80, 0);
            }

            100% {
                box-shadow: 0 0 0 0 rgba(76, 175, 80, 0);
            }
        }

        /* Solution section with animations */
        #solution {
            max-width: 100%;
            margin: 1rem 0;
            text-align: center;
            padding: 1rem;
            background-color: var(--panel-dark);
            border-radius: 8px;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
            animation: fadeIn 0.8s ease-in-out 0.4s both;
            transition: all 0.3s ease;
        }

        #solution:hover {
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
            transform: translateY(-2px);
        }

        #solutionControls {
            display: flex;
            gap: 0.5rem;
            margin-top: 1rem;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            animation: fadeIn 0.8s ease-in-out 0.5s both;
        }

        #stepCounter {
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 0.5rem;
            background-color: var(--panel-dark);
            border-radius: 5px;
            min-width: 100px;
            transition: all 0.3s ease;
            animation: fadeIn 0.8s ease-in-out 0.5s both;
        }

        /* Builder controls with animations */
        #builderControls {
            margin-top: 1rem;
            padding: 1rem;
            border: none;
            border-radius: 8px;
            background-color: var(--panel-dark);
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
            width: 100%;
            animation: slideUp 0.5s ease-in-out;
            transition: all 0.3s ease;
        }

        @keyframes slideUp {
            from {
                transform: translateY(20px);
                opacity: 0;
            }

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

        #builderControls:hover {
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4);
        }

        #colorPalette {
            display: flex;
            gap: 0.75rem;
            margin-bottom: 1rem;
            flex-wrap: wrap;
            justify-content: center;
            animation: fadeIn 0.8s ease-in-out 0.6s both;
        }

        .color-option {
            display: flex;
            flex-direction: column;
            align-items: center;
            cursor: pointer;
            padding: 0.5rem;
            border-radius: 8px;
            transition: all 0.3s ease;
            animation: fadeIn 0.5s ease;
        }

        .color-option:hover {
            background-color: var(--border-dark);
            transform: translateY(-2px);
        }

        .color-option.selected {
            background-color: #324156;
            box-shadow: 0 0 0 2px var(--primary-color);
            animation: bounce 0.5s ease;
        }

        @keyframes bounce {

            0%,
            100% {
                transform: translateY(0);
            }

            50% {
                transform: translateY(-5px);
            }
        }

        #levelControls,
        #savedLevels {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1rem;
            flex-wrap: wrap;
            justify-content: center;
            align-items: center;
            animation: fadeIn 0.8s ease-in-out 0.7s both;
        }

        /* Form inputs with animations */
        input[type="text"],
        input[type="number"],
        select {
            padding: 0.5rem;
            border-radius: 5px;
            border: 1px solid var(--primary-color);
            background-color: #1e2634;
            color: var(--text-light);
            font-size: 0.9rem;
            transition: all 0.3s ease;
            animation: fadeIn 0.5s ease;
        }

        input:focus,
        select:focus {
            border-color: var(--primary-hover);
            outline: none;
            box-shadow: 0 0 0 2px rgba(75, 119, 174, 0.3);
            transform: translateY(-2px);
        }

        /* Image loader section with animations */
        .settings-section {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            margin-top: 2rem;
            justify-content: center;
            animation: fadeIn 0.8s ease-in-out 0.8s both;
        }

        .image-container {
            background-color: var(--panel-dark);
            padding: 1rem;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
            flex: 1;
            min-width: 280px;
            max-width: 400px;
            transition: all 0.3s ease;
            animation: fadeIn 0.8s ease;
        }

        .image-container:hover {
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4);
            transform: translateY(-3px);
        }

        .form-group {
            margin-bottom: 0.75rem;
            animation: fadeIn 0.5s ease;
        }

        .form-group label {
            display: block;
            margin-bottom: 0.25rem;
        }

        #previewContainer {
            margin-top: 1rem;
            border: 2px solid var(--primary-color);
            border-radius: 4px;
            overflow: hidden;
            max-width: 100%;
            transition: all 0.3s ease;
            animation: fadeIn 0.8s ease;
        }

        #previewCanvas {
            max-width: 100%;
            height: auto;
        }

        /* Solution markers with enhanced animations */
        .solution-marker {
            position: absolute;
            width: 20px;
            height: 20px;
            background-color: var(--highlight-color);
            color: white;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
            font-weight: bold;
            z-index: 10;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
            animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }

        /* Add these positioning classes for the markers */
        .top-right {
            top: 0;
            right: 0;
        }

        .top-left {
            top: 0;
            left: 0;
        }

        .bottom-right {
            bottom: 0;
            right: 0;
        }

        .bottom-left {
            bottom: 0;
            left: 0;
        }

        .markers-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
        }

        /* Optional: Make the cell highlight more visible when it has solution steps */
        .solution-cell {
            position: relative;
        }

        .solution-highlight {
            background-color: rgba(255, 69, 0, 0.2);
        }

        /* Media query for mobile devices */
        @media screen and (max-width: 768px) {
            .grid-container {
                max-width: 100%;
                width: 100%;
            }
        }

        .file-drop-area {
            position: relative;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 20px;
            border: 2px dashed var(--primary-color, #3b669d);
            border-radius: 8px;
            background-color: rgba(59, 102, 157, 0.1);
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .file-drop-area.highlight {
            border-color: var(--primary-hover, #4b77ae);
            background-color: rgba(59, 102, 157, 0.2);
            box-shadow: 0 0 10px rgba(0, 229, 255, 0.5);
        }

        .file-msg {
            margin-bottom: 10px;
            color: var(--text-light, #e0e0e0);
            font-size: 0.9rem;
        }

        .file-input-label {
            padding: 8px 16px;
            background-color: var(--primary-color, #3b669d);
            color: var(--text-light, #e0e0e0);
            border-radius: 5px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .file-input-label:hover {
            background-color: var(--primary-hover, #4b77ae);
            transform: translateY(-2px);
        }

        .file-input {
            position: absolute;
            left: 0;
            top: 0;
            height: 100%;
            width: 100%;
            opacity: 0;
            cursor: pointer;
        }

        #preview-filename {
            margin-top: 10px;
            font-size: 0.8rem;
            color: var(--success-color, #4CAF50);
            word-break: break-all;
            text-align: center;
        }