body {
            margin: 0;
            padding: 0;
            background: linear-gradient(to bottom, #0a0a2e, #16213e, #1a1a3a);
            overflow: hidden;
            font-family: 'Inter', 'Arial', sans-serif;
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            position: relative; 
        }
        
        canvas {
            display: block;
            background: radial-gradient(circle at 20% 80%, #120458 0%, transparent 50%),
                        radial-gradient(circle at 80% 20%, #2c1810 0%, transparent 50%),
                        radial-gradient(circle at 40% 40%, #0a0a2e 0%, transparent 50%);
            width: 100%;
            height: 100%;
        }
        
        .game-ui-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none; 
            display: none; 
            flex-direction: column;
            align-items: center;
        }

        .pause-button {
            position: absolute;
            top: 20px;
            left: 20px;
            font-size: clamp(24px, 4vw, 30px); 
            background-color: rgba(0, 120, 150, 0.7);
            color: #00ffff;
            border: 2px solid #00ffff;
            border-radius: 8px;
            padding: 5px 12px; 
            cursor: pointer;
            pointer-events: all; 
            z-index: 15; 
            box-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
            transition: background-color 0.2s, transform 0.1s;
        }

        .pause-button:hover {
            background-color: rgba(0, 150, 180, 0.9);
            transform: scale(1.1);
        }
        
        .problem {
            margin-top: 30px;
            font-size: clamp(24px, 5vw, 36px);
            font-weight: bold;
            text-shadow: 0 0 10px #00ffff, 0 0 20px #00ffff;
            color: #00ffff;
            text-align: center;
        }
        
        .score-container { 
            position: absolute;
            top: 20px;
            right: 30px;
            display: flex;
            flex-direction: column;
            align-items: flex-end;
        }
        .score {
            font-size: clamp(18px, 4vw, 24px);
            color: #ffff00;
            text-shadow: 0 0 5px #ffff00;
        }
        .shields-display {
            font-size: clamp(14px, 3vw, 18px);
            color: #00ff00; 
            text-shadow: 0 0 3px #00ff00;
            margin-top: 5px;
        }
        
        .instructions {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            text-align: center;
            font-size: clamp(12px, 2.5vw, 14px);
            color: #aaa;
            width: 90%;
        }

        .screen {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(10, 10, 46, 0.97); 
            display: none; 
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            z-index: 10; 
            padding: 20px;
            box-sizing: border-box;
            overflow-y: auto;
        }
        .screen h1 {
            font-size: clamp(30px, 7vw, 52px);
            color: #00ffff;
            text-shadow: 0 0 10px #00ffff, 0 0 20px #00ffff;
            margin-bottom: 30px;
        }
        .screen h2 { 
            font-size: clamp(26px, 6vw, 44px);
            color: #ffff00;
            text-shadow: 0 0 8px #ffff00;
            margin-bottom: 15px; 
        }
        .screen button {
            background-color: #0077cc; 
            color: white;
            border: 2px solid #00ffff; 
            padding: 12px 25px;
            font-size: clamp(16px, 3.5vw, 22px);
            font-weight: bold;
            border-radius: 10px; 
            cursor: pointer;
            margin: 10px;
            transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
            box-shadow: 0 4px 15px rgba(0, 200, 255, 0.3); 
            min-width: 180px;
            pointer-events: all; 
        }
        .screen button:hover {
            background-color: #0099e6; 
            transform: translateY(-2px) scale(1.03); 
            box-shadow: 0 6px 20px rgba(0, 255, 255, 0.5);
        }
        .screen button.danger-button { 
            background-color: #cc0000;
            border-color: #ff4444;
            box-shadow: 0 4px 15px rgba(255, 0, 0, 0.3);
        }
        .screen button.danger-button:hover {
            background-color: #e60000;
            box-shadow: 0 6px 20px rgba(255, 50, 50, 0.5);
        }

        .screen > p { 
            font-size: clamp(16px, 3vw, 20px);
            margin-bottom: 20px;
            max-width: 600px;
            line-height: 1.5;
        }

        .level-category-title {
            font-size: clamp(18px, 4vw, 24px);
            color: #ff8c00; 
            margin-top: 20px;
            margin-bottom: 10px;
            text-shadow: 0 0 5px #ff8c00;
        }

        #levelSelectMenu .level-buttons-container {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            max-width: 800px; 
            margin-bottom: 15px;
        }
        #levelSelectMenu .level-buttons-container button {
            padding: 10px 15px;
            min-width: 55px; 
            font-size: clamp(14px, 3vw, 18px);
        }
         #levelSelectMenu .core-level-button { 
            min-width: 200px !important; 
            padding: 12px 20px !important;
            font-size: clamp(15px, 3.2vw, 20px) !important;
        }

        .report-container {
            background-color: rgba(0, 0, 0, 0.4); padding: 15px; border-radius: 8px;
            margin-top: 10px; margin-bottom: 15px; max-width: 90%; width: 600px; 
            min-height: 150px; max-height: 350px; border: 1px solid #00ffff66; 
            color: #e0e0e0; text-align: left; box-shadow: 0 0 15px rgba(0, 255, 255, 0.2);
            display: flex; flex-direction: column; 
        }
        .report-container h3 { 
            color: #ffff00; margin-top: 0; margin-bottom: 10px;
            font-size: clamp(17px, 3.2vw, 20px); border-bottom: 1px solid #00ffff44;
            padding-bottom: 8px; flex-shrink: 0; 
        }
        .report-content-scrollable { flex-grow: 1; overflow-y: auto; padding-right: 10px; }
        .report-container p { margin-bottom: 10px; line-height: 1.6; font-size: clamp(15px, 2.8vw, 18px); }
        .report-container p.final-score-report { font-weight: bold; color: #00ff00; margin-bottom: 15px; }
        
        .stats-table { width: 100%; border-collapse: collapse; margin-top: 0; }
        .stats-table th, .stats-table td {
            border: 1px solid #00ffff88; padding: 8px 10px; text-align: left;
            font-size: clamp(13px, 2.5vw, 16px); word-break: break-word; 
        }
        .stats-table th {
            background-color: rgba(0, 80, 120, 0.6); color: #ffff00;
            position: sticky; top: 0; z-index: 1; 
        }
        .stats-table td:nth-child(1) { width: 50%; }
        .stats-table td:nth-child(2), .stats-table td:nth-child(3) { text-align: center; width: 25%; }

        .heatmap-container {
            display: grid; grid-template-columns: repeat(13, 1fr); gap: 2px; padding: 10px;
            background-color: rgba(0,0,0,0.2); border-radius: 8px; max-width: 90vw; margin: 20px auto;
        }
        .heatmap-cell, .heatmap-header {
            aspect-ratio: 1 / 1; display: flex; align-items: center; justify-content: center;
            font-size: clamp(10px, 1.5vw, 14px); font-weight: bold;
            border: 1px solid #003344; border-radius: 4px; color: white;
        }
        .heatmap-header { background-color: rgba(0, 80, 120, 0.5); color: #ffff00; }
        .heatmap-cell { background-color: #444; cursor: default; transition: transform 0.1s ease-in-out; }
        .heatmap-cell:hover { transform: scale(1.1); z-index: 2; }

        #finalChallengeScreen {
            justify-content: flex-start; /* Aligns content to the top */
            padding-top: 5vh;
        }
        #finalChallengeScreen .scrollable-text {
            max-height: 20vh;
            overflow-y: auto;
            margin-bottom: 15px;
        }
        #challengeHeatmapContainer {
            transform: scale(0.75);
            margin: -15px auto;
        }

        .modal-overlay {
            position: fixed; top: 0; left: 0; width: 100%; height: 100%;
            background-color: rgba(0,0,0,0.7); display: none; align-items: center;
            justify-content: center; z-index: 1000;
        }
        .modal-content {
            background-color: #1a2a4a; padding: 25px; border-radius: 10px;
            border: 2px solid #00ffff; text-align: center;
            box-shadow: 0 5px 25px rgba(0, 200, 255, 0.4);
            max-width: 90%; width: 400px;
        }
        .modal-content p { font-size: clamp(16px, 3vw, 18px); margin-bottom: 20px; color: #eee; }
        .modal-buttons button { min-width: 120px; margin: 5px 10px; }
        
        /* --- MAP STYLES --- */
        #mapContainer {
            width: 90%;
            max-width: 800px;
            height: 60vh;
            background: #00000033;
            border: 1px solid #00ffff;
            border-radius: 8px;
            margin-bottom: 15px;
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 15px;
            overflow-y: auto;
        }
        .map-node {
            padding: 15px 20px;
            border-radius: 8px;
            border: 2px solid;
            text-align: left;
            font-size: clamp(14px, 3vw, 18px);
            transition: all 0.2s ease-in-out;
        }
        .map-node h3 { margin: 0 0 5px 0; font-size: clamp(16px, 3.5vw, 20px); }
        .map-node p { margin: 0; font-size: clamp(12px, 2.5vw, 14px); opacity: 0.8; }
        .map-node.locked {
            background-color: #333;
            border-color: #555;
            color: #777;
        }
        .map-node.completed {
            background-color: #004444;
            border-color: #007777;
            color: #aaffff;
            cursor: pointer;
        }
        .map-node.completed:hover {
            background-color: #006666;
        }
        .map-node.current {
            background-color: #0077cc;
            border-color: #00ffff;
            color: white;
            cursor: pointer;
            transform: scale(1.03);
            box-shadow: 0 0 15px rgba(0, 255, 255, 0.5);
        }
        .map-node.current:hover {
            background-color: #0099e6;
        }
        
        /* --- DEV TOOLS STYLES --- */
        .dev-tools-container {
            border-top: 1px solid #00ffff88;
            margin-top: 15px;
            padding-top: 15px;
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }
        .dev-tools-container button {
            background-color: #4a0d66;
            border-color: #aa44ff;
            font-size: clamp(12px, 2.5vw, 14px);
            padding: 8px 15px;
            min-width: auto;
        }
        .dev-tools-container button:hover {
            background-color: #6a2da6;
        }

        #mainMenu, #levelSelectMenu, #levelCompleteScreen, #gameOverScreen, #pauseMenuScreen,
        #reportingMenuScreen, #heatmapReportScreen, #settingsScreen, #confirmationModal,
        #learningMapScreen, #instructionScreen, #journeyIntroScreen, #finalChallengeScreen,
        #waveAlertModal, #graduationScreen { 
            display: none;
        }