:root {
            --bg-color: #0d1117;
            --terminal-bg: #010409;
            --primary-text: #c9d1d9;
            --accent-color: #58a6ff;
            --accent-glow: rgba(88, 166, 255, 0.3);
            --success-color: #39d353;
            --error-color: #f85149;
            --border-color: #30363d;
            --header-bg: #161b22;
            --font-family: 'Fira Code', monospace;
            --base-font-size: 16px;
        }

        /* General Setup */
        html, body {
            margin: 0;
            padding: 0;
            height: 100%;
            width: 100%;
            background-color: var(--bg-color);
            color: var(--primary-text);
            font-family: var(--font-family);
            font-size: var(--base-font-size);
            overflow: hidden;
        }

        /* Game Wrapper */
        .game-wrapper {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100%;
            padding: 20px;
            box-sizing: border-box;
        }

        /* Pop-up Modals (Start, Warning, Game Over) */
        .modal-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(13, 17, 23, 0.9);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 100;
            text-align: center;
            padding: 20px;
            box-sizing: border-box;
        }

        .modal-content {
            background-color: var(--terminal-bg);
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 8px;
            max-width: 650px;
            box-shadow: 0 0 25px rgba(0,0,0,0.5);
        }

        .modal-content h1 {
            color: var(--accent-color);
            margin-top: 0;
            font-size: 2em;
        }

        .modal-content p {
            line-height: 1.7;
            font-size: 1.1em;
        }
        
        #start-screen, #game-over-screen, #warning-screen {
            display: none;
        }
        
        .start-button, .reset-button {
            background-color: var(--accent-color);
            color: var(--terminal-bg);
            border: 1px solid var(--accent-color);
            padding: 15px 30px;
            font-family: var(--font-family);
            font-size: 1.1em;
            font-weight: 700;
            cursor: pointer;
            border-radius: 6px;
            margin-top: 25px;
            transition: all 0.2s ease-in-out;
        }

        .start-button:hover, .reset-button:hover {
            background-color: #79b8ff;
            box-shadow: 0 0 15px var(--accent-glow);
        }

        /* Main Game Container */
        #game-container {
            width: 100%;
            height: 100%;
            max-width: 1500px;
            display: none;
            flex-direction: column;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            background-color: var(--terminal-bg);
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0,0,0,0.3);
        }

        /* Header: Progress & Timer */
        .game-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 20px;
            border-bottom: 1px solid var(--border-color);
            background-color: var(--header-bg);
        }

        #progress-text {
            font-weight: 700;
            font-size: 1.1em;
            color: var(--primary-text);
        }

        #timer {
            font-weight: 700;
            color: var(--success-color);
            font-size: 1.3em;
            letter-spacing: 1px;
        }

        /* Main Content Area (2-column layout) */
        .main-content {
            display: flex;
            flex-grow: 1;
            overflow: hidden;
        }
        
        /* Panel Base Style */
        .panel {
            padding: 20px;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
        }
        
        .panel-header {
            padding-bottom: 10px;
            margin-bottom: 20px;
            border-bottom: 1px solid var(--border-color);
            color: var(--primary-text);
            font-weight: 700;
            text-align: center;
            letter-spacing: 1px;
            text-transform: uppercase;
        }
        
        .panel-header .icon {
            margin-right: 8px;
        }

        /* AI Chat Panel (Left Column) */
        #ai-chat-panel {
            width: 40%;
            border-right: 1px solid var(--border-color);
        }
        
        .ai-message {
            color: var(--error-color);
            font-style: italic;
            margin-bottom: 20px;
            line-height: 1.6;
            word-wrap: break-word;
        }
        .ai-message strong {
            font-weight: 700;
        }

        /* Terminal Panel (Right Column) */
        #terminal-panel {
            width: 60%;
        }

        #terminal-output {
            flex-grow: 1;
            white-space: pre-wrap;
            word-wrap: break-word;
        }

        .terminal-line {
            margin-bottom: 10px;
            line-height: 1.5;
        }

        #input-line {
            display: flex;
            margin-top: auto; /* Pushes input to the bottom */
            padding-top: 15px;
            border-top: 1px solid var(--border-color);
        }

        .prompt {
            color: var(--success-color);
            font-weight: 700;
            animation: blink-caret 1.2s step-end infinite;
        }

        #terminal-input {
            background: transparent;
            border: none;
            color: var(--primary-text);
            font-family: var(--font-family);
            font-size: 1em;
            flex-grow: 1;
            padding-left: 10px;
            outline: none;
        }

        /* Text Styles */
        .narrative { color: var(--accent-color); font-style: italic; }
        .task-title { color: var(--success-color); font-weight: 700; font-size: 1.1em; text-transform: uppercase;}
        .grid, .corrupted-msg { letter-spacing: 0.2em; color: #a5d6ff; }
        .flag { color: var(--success-color); font-weight: 700; background-color: rgba(57, 211, 83, 0.1); padding: 4px 8px; border-radius: 4px; border: 1px solid var(--success-color);}
        .error-msg { color: var(--error-color); font-weight: bold; }
        
        /* Level 4 Password Rules */
        #password-rules { margin: 25px 0; }
        .rule { 
            display: flex; 
            align-items: center; 
            margin-bottom: 18px;
            font-size: 1em;
        }
        
        .rule input[type="checkbox"] {
            -webkit-appearance: none;
            appearance: none;
            background-color: transparent;
            margin: 0;
            margin-right: 15px;
            color: var(--success-color);
            width: 1.2em;
            height: 1.2em;
            border: 0.15em solid var(--success-color);
            border-radius: 0.15em;
            display: grid;
            place-content: center;
            cursor: default;
        }

        .rule input[type="checkbox"]::before {
            content: "";
            width: 0.65em;
            height: 0.65em;
            transform: scale(0);
            transition: 120ms transform ease-in-out;
            box-shadow: inset 1em 1em var(--success-color);
            transform-origin: bottom left;
            clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
        }

        .rule input[type="checkbox"]:checked::before {
            transform: scale(1);
        }

        @keyframes blink-caret {
            from, to { color: transparent; }
            50% { color: var(--success-color); }
        }

        @media (max-width: 1024px) {
            .main-content { flex-direction: column; }
            #ai-chat-panel, #terminal-panel { width: 100%; height: 50%; box-sizing: border-box; }
            #ai-chat-panel { border-right: none; border-bottom: 1px solid var(--border-color);}
        }

        @media (max-width: 768px) {
            :root { --base-font-size: 14px; }
            .game-wrapper { padding: 5px; }
            .modal-content { padding: 25px; }
        }