:root {
            --bg-color: #060911;
            --container-bg: #0b111e;
            --card-bg: #121a2c;
            --border-color: #1e2d4a;
            --accent-cyan: #00f0ff;
            --accent-green: #00ff88;
            --accent-red: #ff2a6d;
            --accent-gold: #ffb703;
            --text-primary: #e2e8f0;
            --text-secondary: #64748b;
            --font-header: 'Orbitron', sans-serif;
            --font-body: 'Rajdhani', sans-serif;
            --font-mono: 'Share Tech Mono', monospace;
            --glow-color: rgba(0, 240, 255, 0.2);
            --shadow-color: rgba(0, 0, 0, 0.7);
            --canvas-bg: #04070f;
            --panel-sunken: rgba(0, 0, 0, 0.25);

            /* Shared kit mapping */
            --kit-accent: var(--accent-cyan);
            --kit-accent-ink: #001014;
            --kit-accent-glow: var(--glow-color);
            --kit-surface: var(--card-bg);
            --kit-border: var(--border-color);
            --kit-input-bg: var(--container-bg);
            --kit-error: var(--accent-red);
        }

        body.light-mode {
            --bg-color: #f1f5f9;
            --container-bg: #ffffff;
            --card-bg: #f8fafc;
            --border-color: #cbd5e1;
            --accent-cyan: #0284c7;
            --accent-green: #16a34a;
            --accent-red: #dc2626;
            --accent-gold: #d97706;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --glow-color: rgba(2, 132, 199, 0.12);
            --shadow-color: rgba(0, 0, 0, 0.08);
            --canvas-bg: #eef3fa;
            --panel-sunken: rgba(2, 132, 199, 0.06);

            /* Shared kit mapping (redeclared here — custom properties whose
               value is itself var(--other-var) do not reliably re-track that
               other var's light-mode override across browsers, so each theme
               block must restate these explicitly) */
            --kit-accent: var(--accent-cyan);
            --kit-accent-ink: #001014;
            --kit-accent-glow: var(--glow-color);
            --kit-surface: var(--card-bg);
            --kit-border: var(--border-color);
            --kit-input-bg: var(--container-bg);
            --kit-error: var(--accent-red);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-primary);
            font-family: var(--font-body);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 16px;
        }

        /* Fixed Top Right Control Switch */
        .top-controls {
            position: fixed;
            top: 18px;
            right: 22px;
            z-index: 1000;
        }

        .theme-toggle-btn {
            background: var(--container-bg);
            color: var(--text-primary);
            border: 2px solid var(--border-color);
            padding: 8px 16px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-weight: 700;
            font-size: 0.85rem;
            cursor: pointer;
            box-shadow: 0 4px 12px var(--shadow-color);
            letter-spacing: 1px;
        }

        .theme-toggle-btn:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        /* Main Container */
        .tactical-container {
            width: 100%;
            max-width: 980px;
            background: var(--container-bg);
            border: 2px solid var(--border-color);
            border-top: 5px solid var(--accent-cyan);
            border-radius: 6px;
            padding: 28px;
            box-shadow: 0 16px 40px var(--shadow-color);
            min-height: 600px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .title-header {
            font-family: var(--font-header);
            font-size: 1.8rem;
            color: var(--accent-cyan);
            text-align: center;
            letter-spacing: 2px;
            margin-bottom: 4px;
            text-transform: uppercase;
        }

        .subtitle-header {
            font-family: var(--font-mono);
            text-align: center;
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-bottom: 20px;
            letter-spacing: 1px;
            text-transform: uppercase;
        }

        /* HUD Bar */
        .hud-status-bar {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 10px 18px;
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 12px 18px;
            margin-bottom: 20px;
            font-family: var(--font-mono);
            border-radius: 4px;
        }

        .hud-item {
            display: flex;
            flex-direction: column;
        }

        .hud-label {
            font-size: 0.75rem;
            color: var(--text-secondary);
            text-transform: uppercase;
        }

        .hud-value {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--accent-cyan);
        }

        /* Battery Energy Gauge */
        .battery-container {
            width: 160px;
            height: 12px;
            background: var(--border-color);
            border-radius: 6px;
            overflow: hidden;
            margin-top: 4px;
        }

        .battery-fill {
            height: 100%;
            width: 100%;
            background: var(--accent-green);
            transition: width 0.3s ease, background-color 0.3s ease;
        }

        /* Layout Grid for Interactive Arena */
        .arena-grid {
            display: grid;
            grid-template-columns: 380px 1fr;
            gap: 24px;
            align-items: start;
        }

        @media (max-width: 820px) {
            .arena-grid {
                grid-template-columns: 1fr;
            }
        }

        /* Canvas Radar Container */
        .canvas-wrapper {
            position: relative;
            width: 380px;
            height: 380px;
            margin: 0 auto;
            background: var(--canvas-bg);
            border: 2px solid var(--border-color);
            border-radius: 6px;
            box-shadow: inset 0 0 20px rgba(0, 240, 255, 0.05);
            cursor: crosshair;
        }

        canvas {
            display: block;
            width: 100%;
            height: 100%;
        }

        /* Command Terminal Controls */
        .terminal-panel {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: 6px;
            padding: 20px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-height: 380px;
        }

        .telemetry-box {
            background: var(--panel-sunken);
            border: 1px solid var(--border-color);
            border-left: 3px solid var(--accent-cyan);
            padding: 14px 18px;
            margin-bottom: 16px;
            border-radius: 4px;
        }

        .telemetry-title {
            font-family: var(--font-mono);
            font-size: 0.75rem;
            color: var(--accent-cyan);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 6px;
        }

        .telemetry-prompt {
            font-size: 1.15rem;
            line-height: 1.5;
            font-weight: 600;
        }

        /* Deadpan Tactical-AI Commentary Line */
        .ai-quip-line {
            font-family: var(--font-mono);
            font-size: 0.78rem;
            color: var(--text-secondary);
            font-style: italic;
            line-height: 1.45;
            margin: 8px 0 16px;
        }

        /* Incoming Intercept Overlay Banner (sits on the radar canvas) */
        .intercept-banner {
            position: absolute;
            top: 8px;
            left: 8px;
            right: 8px;
            z-index: 5;
            display: flex;
            flex-direction: column;
            gap: 5px;
            background: var(--panel-sunken);
            border: 1px solid var(--accent-red);
            border-radius: 4px;
            padding: 6px 10px;
            font-family: var(--font-mono);
            font-size: 0.68rem;
            font-weight: 700;
            color: var(--accent-red);
            text-transform: uppercase;
            letter-spacing: 1px;
            pointer-events: none;
            animation: interceptPulse 0.6s ease-in-out infinite alternate;
        }

        @keyframes interceptPulse {
            from { opacity: 0.78; }
            to { opacity: 1; }
        }

        .intercept-timer-track {
            width: 100%;
            height: 5px;
            background: var(--border-color);
            border-radius: 3px;
            overflow: hidden;
        }

        .intercept-timer-fill {
            height: 100%;
            width: 100%;
            background: var(--accent-red);
            transition: width 0.05s linear;
        }

        /* Coordinate Inputs */
        .coord-control-group {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-bottom: 16px;
        }

        .slider-row {
            display: flex;
            align-items: center;
            gap: 12px;
            font-family: var(--font-mono);
        }

        .slider-label {
            width: 80px;
            font-weight: 700;
            color: var(--accent-cyan);
        }

        .coord-slider {
            flex: 1;
            accent-color: var(--accent-cyan);
            cursor: pointer;
        }

        .coord-val-display {
            width: 44px;
            text-align: right;
            font-size: 1.1rem;
            font-weight: 700;
        }

        /* Tactical Action Buttons */
        .fire-btn {
            background: var(--accent-cyan);
            color: #000;
            border: none;
            padding: 14px;
            font-family: var(--font-header);
            font-size: 1rem;
            font-weight: 900;
            letter-spacing: 2px;
            text-transform: uppercase;
            cursor: pointer;
            border-radius: 4px;
            box-shadow: 0 4px 14px var(--glow-color);
            transition: transform 0.15s ease, opacity 0.15s ease;
            width: 100%;
        }

        .fire-btn:hover {
            transform: translateY(-2px);
            opacity: 0.95;
        }

        /* Feedback Status */
        .feedback-line {
            font-family: var(--font-mono);
            text-align: center;
            font-size: 1rem;
            font-weight: 700;
            min-height: 24px;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-top: 10px;
        }

        .text-success { color: var(--accent-green); }
        .text-error { color: var(--accent-red); }

        /* General Layout Screen Center */
        .screen-center {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 10px 0;
        }

        .primary-btn {
            background: var(--accent-cyan);
            color: #000;
            border: none;
            padding: 14px 40px;
            font-family: var(--font-header);
            font-size: 1rem;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            cursor: pointer;
            margin-top: 20px;
            border-radius: 4px;
            box-shadow: 0 4px 16px var(--glow-color);
        }

        .briefing-box {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            padding: 22px 28px;
            text-align: left;
            margin: 20px 0;
            max-width: 680px;
            line-height: 1.7;
            font-size: 1rem;
            border-radius: 4px;
        }

        .briefing-box ul { padding-left: 20px; }
        .briefing-box li { margin-bottom: 8px; }

        .disclaimer-card {
            background: rgba(0, 240, 255, 0.05);
            border: 2px dashed var(--accent-cyan);
            padding: 22px 26px;
            margin: 20px 0;
            text-align: center;
            max-width: 680px;
            border-radius: 4px;
        }

        .disclaimer-card h3 {
            font-family: var(--font-header);
            color: var(--accent-cyan);
            font-size: 1.1rem;
            margin-bottom: 8px;
            letter-spacing: 1px;
            text-transform: uppercase;
        }

        footer {
            margin-top: 20px;
            font-family: var(--font-mono);
            font-size: 0.8rem;
            color: var(--text-secondary);
            text-align: center;
        }