:root {
            --bg-color: #090d16;
            --card-bg: #131c2e;
            --card-border: #2a3b5c;
            --accent-blue: #38bdf8;
            --accent-yellow: #facc15;
            --accent-green: #4ade80;
            --accent-purple: #c084fc;
            --accent-red: #f43f5e;
            --accent-pink: #f472b6;
            --text-color: #f8fafc;
            --subtext-color: #94a3b8;
            --box-bg: #0b1322;

            /* Shared kit mapping */
            --kit-accent: var(--accent-blue);
            --kit-accent-ink: #ffffff;
            --kit-accent-glow: rgba(56, 189, 248, 0.3);
            --kit-surface: var(--box-bg);
            --kit-border: var(--card-border);
            --kit-input-bg: var(--card-bg);
            --kit-error: var(--accent-red);
        }

        body.light-mode {
            --bg-color: #f0fdf4;
            --card-bg: #ffffff;
            --card-border: #cbd5e1;
            --accent-blue: #0284c7;
            --accent-yellow: #d97706;
            --accent-green: #15803d;
            --accent-purple: #7e22ce;
            --accent-red: #e11d48;
            --accent-pink: #db2777;
            --text-color: #0f172a;
            --subtext-color: #475569;
            --box-bg: #f8fafc;

            /* Shared kit mapping (redeclared here — a custom property whose
               value is var(--other-var) does not reliably re-track that
               other var's light-mode override, so each theme block restates
               these explicitly) */
            --kit-accent: var(--accent-blue);
            --kit-accent-ink: #001420;
            --kit-accent-glow: rgba(2, 132, 199, 0.25);
            --kit-surface: var(--box-bg);
            --kit-border: var(--card-border);
            --kit-input-bg: var(--card-bg);
            --kit-error: var(--accent-red);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Nunito', sans-serif;
            transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-color);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 20px;
            overflow-x: hidden;
        }

        /* Top Bar & Theme Toggle in Right Corner */
        .top-bar {
            position: fixed;
            top: 16px;
            right: 20px;
            z-index: 1000;
        }

        .theme-btn {
            background: var(--card-bg);
            color: var(--text-color);
            border: 2px solid var(--card-border);
            padding: 10px 18px;
            border-radius: 20px;
            font-weight: 800;
            font-size: 0.95rem;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .theme-btn:hover {
            transform: translateY(-2px);
            border-color: var(--accent-blue);
        }

        /* Container Card */
        .game-card {
            width: 100%;
            max-width: 820px;
            background: var(--card-bg);
            border: 3px solid var(--card-border);
            border-radius: 24px;
            padding: 32px;
            box-shadow: 0 16px 36px rgba(0,0,0,0.3);
            display: flex;
            flex-direction: column;
            position: relative;
            min-height: 540px;
            justify-content: space-between;
        }

        .arcade-title {
            font-family: 'Fredoka', cursive, sans-serif;
            font-size: 2.2rem;
            color: var(--accent-yellow);
            text-align: center;
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .sub-title {
            text-align: center;
            color: var(--subtext-color);
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 24px;
        }

        /* HUD Bar */
        .hud-bar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: var(--box-bg);
            padding: 12px 20px;
            border-radius: 16px;
            border: 2px solid var(--card-border);
            margin-bottom: 20px;
        }

        .hud-item {
            font-family: 'Fredoka', sans-serif;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
        }

        .hp-hearts {
            color: var(--accent-red);
            font-size: 1.2rem;
            letter-spacing: 2px;
        }

        /* Question Box */
        .question-box {
            background: var(--box-bg);
            border: 2px solid var(--card-border);
            border-left: 6px solid var(--accent-blue);
            border-radius: 16px;
            padding: 22px;
            font-size: 1.2rem;
            line-height: 1.6;
            margin-bottom: 20px;
            font-weight: 700;
        }

        /* Options Grid */
        .options-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
            margin-bottom: 20px;
        }

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

        .option-btn {
            background: var(--box-bg);
            color: var(--text-color);
            border: 2px solid var(--card-border);
            padding: 16px 20px;
            border-radius: 16px;
            font-size: 1.05rem;
            font-weight: 700;
            cursor: pointer;
            text-align: left;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .option-btn:hover {
            border-color: var(--accent-blue);
            background: rgba(56, 189, 248, 0.08);
            transform: translateY(-2px);
        }

        .option-prefix {
            background: var(--card-border);
            color: var(--accent-blue);
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'Fredoka', sans-serif;
            font-size: 0.9rem;
            flex-shrink: 0;
        }

        /* Feedback Message */
        .feedback-banner {
            text-align: center;
            font-family: 'Fredoka', sans-serif;
            font-size: 1.2rem;
            font-weight: 700;
            min-height: 32px;
            margin-top: 6px;
        }

        .feedback-correct { color: var(--accent-green); }
        .feedback-wrong { color: var(--accent-red); }

        /* Start & Ending Screens */
        .screen-center {
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 10px 0;
        }

        .start-btn, .action-btn {
            background: var(--accent-blue);
            color: #ffffff;
            border: none;
            padding: 16px 40px;
            border-radius: 18px;
            font-family: 'Fredoka', sans-serif;
            font-size: 1.3rem;
            cursor: pointer;
            box-shadow: 0 6px 18px rgba(56, 189, 248, 0.4);
            margin-top: 20px;
            transition: transform 0.2s ease, background-color 0.2s ease;
        }

        .start-btn:hover, .action-btn:hover {
            transform: scale(1.05);
            background: #0284c7;
        }

        .instructions-list {
            text-align: left;
            background: var(--box-bg);
            border: 2px solid var(--card-border);
            border-radius: 16px;
            padding: 20px 28px;
            margin: 16px 0;
            font-size: 1.05rem;
            line-height: 1.8;
            font-weight: 600;
            max-width: 680px;
        }

        .instructions-list li {
            margin-bottom: 8px;
        }

        /* Victory Disclaimer Alert Box */
        .disclaimer-alert {
            background: rgba(250, 204, 21, 0.12);
            border: 3px dashed var(--accent-yellow);
            border-radius: 18px;
            padding: 20px 24px;
            margin: 20px 0;
            text-align: center;
            box-shadow: 0 8px 20px rgba(250, 204, 21, 0.15);
        }

        .disclaimer-alert h3 {
            color: var(--accent-yellow);
            font-size: 1.3rem;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .disclaimer-alert p {
            font-size: 1.05rem;
            color: var(--text-color);
            font-weight: 700;
            line-height: 1.5;
        }

        /* Screen Shake Animation */
        .shake {
            animation: shake 0.35s ease-in-out;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            20% { transform: translateX(-10px); }
            40% { transform: translateX(10px); }
            60% { transform: translateX(-6px); }
            80% { transform: translateX(6px); }
        }

        footer {
            margin-top: 20px;
            text-align: center;
            font-size: 0.9rem;
            color: var(--subtext-color);
            font-weight: 700;
        }

        footer span { color: var(--accent-yellow); }

        /* ==========================================================
           TERMINAL HACKING KEYPAD — AI sidekick, hacking-progress
           meter, typed keypad input, and drag-to-reorder tiles.
           ========================================================== */

        /* AI Sidekick */
        .sidekick-bar {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            background: var(--box-bg);
            border: 2px solid var(--accent-purple);
            border-radius: 16px;
            padding: 12px 16px;
            margin-bottom: 16px;
        }

        .sidekick-avatar {
            font-size: 1.6rem;
            flex-shrink: 0;
            background: var(--card-bg);
            border: 2px solid var(--accent-purple);
            border-radius: 50%;
            width: 42px;
            height: 42px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .sidekick-bubble {
            font-weight: 700;
            font-size: 0.96rem;
            line-height: 1.45;
            color: var(--text-color);
            padding-top: 4px;
        }

        /* Hacking Progress Meter */
        .hack-progress-wrap {
            margin-bottom: 18px;
        }

        .hack-progress-label {
            display: flex;
            justify-content: space-between;
            font-family: 'Fredoka', sans-serif;
            font-size: 0.85rem;
            font-weight: 700;
            color: var(--subtext-color);
            margin-bottom: 6px;
        }

        .hack-progress-track {
            width: 100%;
            height: 14px;
            background: var(--box-bg);
            border: 2px solid var(--card-border);
            border-radius: 10px;
            overflow: hidden;
        }

        .hack-progress-bar {
            height: 100%;
            width: 0%;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
            border-radius: 10px 0 0 10px;
            transition: width 0.25s ease, background 0.25s ease;
        }

        .hack-progress-bar.hack-success {
            background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
        }

        /* Typed Keypad Answer Mode */
        .type-answer-wrap {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-bottom: 8px;
        }

        .hack-input {
            font-family: 'Fredoka', monospace, sans-serif;
            font-size: 1.25rem;
            font-weight: 700;
            padding: 14px 16px;
            border-radius: 14px;
            border: 2px solid var(--card-border);
            background: var(--box-bg);
            color: var(--accent-green);
            outline: none;
            letter-spacing: 1px;
            width: 100%;
        }

        .hack-input:focus {
            border-color: var(--accent-blue);
            box-shadow: 0 0 0 3px var(--kit-accent-glow);
        }

        .hack-input.shake-field {
            animation: shake 0.3s ease-in-out;
            border-color: var(--accent-red);
        }

        .keypad-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 8px;
        }

        .keypad-btn {
            background: var(--card-bg);
            border: 2px solid var(--card-border);
            color: var(--text-color);
            border-radius: 10px;
            padding: 12px 0;
            font-family: 'Fredoka', sans-serif;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: transform 0.15s ease, border-color 0.15s ease;
        }

        .keypad-btn:hover {
            border-color: var(--accent-blue);
            transform: translateY(-1px);
        }

        .keypad-btn.keypad-del,
        .keypad-btn.keypad-clr {
            color: var(--accent-red);
        }

        .hack-submit-btn {
            background: var(--accent-blue);
            color: #ffffff;
            border: none;
            padding: 15px;
            border-radius: 14px;
            font-family: 'Fredoka', sans-serif;
            font-size: 1.1rem;
            font-weight: 700;
            cursor: pointer;
            transition: transform 0.15s ease, filter 0.15s ease;
        }

        .hack-submit-btn:hover {
            transform: translateY(-2px);
            filter: brightness(1.08);
        }

        /* Drag-to-Reorder Sequence Lock */
        .order-answer-wrap {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .order-tiles {
            display: flex;
            flex-direction: column;
            gap: 10px;
            touch-action: none;
        }

        .order-tile {
            display: flex;
            align-items: center;
            gap: 12px;
            background: var(--box-bg);
            border: 2px solid var(--card-border);
            border-radius: 14px;
            padding: 14px 16px;
            font-weight: 700;
            font-size: 1rem;
            cursor: grab;
            user-select: none;
            -webkit-user-select: none;
            touch-action: none;
            position: relative;
        }

        .order-tile.dragging {
            cursor: grabbing;
            border-color: var(--accent-purple);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
            z-index: 50;
            background: var(--card-bg);
        }

        .order-handle {
            color: var(--subtext-color);
            font-size: 1.15rem;
            flex-shrink: 0;
        }

        .order-text {
            flex: 1;
        }

        .order-move-btns {
            display: flex;
            flex-direction: column;
            gap: 3px;
            flex-shrink: 0;
        }

        .order-move-btn {
            background: none;
            border: 1px solid var(--card-border);
            color: var(--subtext-color);
            border-radius: 6px;
            width: 26px;
            height: 20px;
            font-size: 0.7rem;
            cursor: pointer;
            line-height: 1;
        }

        .order-move-btn:hover {
            border-color: var(--accent-blue);
            color: var(--accent-blue);
        }

        /* Glitch / Visual Static Overlay on incorrect entry */
        .glitch-overlay {
            position: absolute;
            inset: 0;
            pointer-events: none;
            opacity: 0;
            border-radius: 24px;
            background: repeating-linear-gradient(
                0deg,
                rgba(244, 63, 94, 0.1) 0px,
                rgba(56, 189, 248, 0.08) 2px,
                transparent 4px,
                transparent 6px
            );
            mix-blend-mode: overlay;
        }

        .glitch-overlay.glitch-active {
            animation: glitchNoise 0.42s steps(3, end);
        }

        @keyframes glitchNoise {
            0% { opacity: 0; transform: translate(0, 0); }
            20% { opacity: 0.9; transform: translate(-3px, 1px); }
            40% { opacity: 0.4; transform: translate(3px, -2px); }
            60% { opacity: 0.9; transform: translate(-2px, 2px); }
            80% { opacity: 0.3; transform: translate(2px, -1px); }
            100% { opacity: 0; transform: translate(0, 0); }
        }

        @media (max-width: 600px) {
            .keypad-grid { grid-template-columns: repeat(4, 1fr); gap: 6px; }
            .keypad-btn { padding: 10px 0; font-size: 0.9rem; }
        }