:root {
            --primary: #ff3333;
            --primary-glow: rgba(255, 51, 51, 0.6);
            --accent: #00f0ff;
            --accent-glow: rgba(0, 240, 255, 0.5);
            --bg-glass: rgba(15, 18, 28, 0.75);
            --border-glass: rgba(255, 255, 255, 0.15);
        }

        * {
            box-sizing: border-box;
            user-select: none;
            -webkit-user-select: none;
        }

        body, html {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            background-color: #050508;
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            touch-action: none;
        }

        #gameCanvas {
            width: 100%;
            height: 100%;
            display: block;
            cursor: crosshair;
        }

        /* Glassmorphism HUD */
        #hud {
            position: absolute;
            top: 20px;
            left: 20px;
            display: none;
            flex-direction: column;
            gap: 12px;
            z-index: 10;
            pointer-events: none;
        }

        .hud-card {
            background: var(--bg-glass);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: 12px;
            padding: 12px 20px;
            color: #fff;
            box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
            min-width: 200px;
        }

        .hud-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: #88a;
            margin-bottom: 4px;
        }

        .hud-val {
            font-size: 24px;
            font-weight: 700;
            letter-spacing: 1px;
            text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
        }

        /* Health Bar */
        .bar-container {
            width: 100%;
            height: 10px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 5px;
            overflow: hidden;
            margin-top: 6px;
            position: relative;
        }

        .bar-fill {
            height: 100%;
            width: 100%;
            background: linear-gradient(90deg, #ff3333, #ff6600);
            box-shadow: 0 0 12px var(--primary-glow);
            transition: width 0.25s ease-out, background-color 0.3s;
        }

        /* Weapon Bar */
        #weaponSelector {
            position: absolute;
            bottom: 25px;
            left: 50%;
            transform: translateX(-50%);
            display: none;
            gap: 10px;
            z-index: 10;
            background: var(--bg-glass);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            padding: 8px;
            border-radius: 16px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
        }

        .weapon-btn {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 10px;
            padding: 8px 16px;
            color: #aaa;
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            pointer-events: auto;
        }

        .weapon-btn.active {
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.25), rgba(0, 100, 255, 0.3));
            border-color: var(--accent);
            color: #fff;
            box-shadow: 0 0 15px var(--accent-glow);
            transform: translateY(-2px);
        }

        .weapon-key {
            font-size: 10px;
            color: #667;
            background: rgba(0, 0, 0, 0.4);
            padding: 2px 6px;
            border-radius: 4px;
        }

        .weapon-btn.active .weapon-key {
            color: var(--accent);
            background: rgba(0, 240, 255, 0.2);
        }

        /* Crosshair & Hit Markers */
        #crosshair {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 24px;
            height: 24px;
            transform: translate(-50%, -50%);
            pointer-events: none;
            z-index: 8;
            display: none;
        }

        .ch-dot {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 4px;
            height: 4px;
            background: #fff;
            border-radius: 50%;
            transform: translate(-50%, -50%);
            box-shadow: 0 0 5px rgba(255,255,255,0.8);
        }

        .ch-line {
            position: absolute;
            background: rgba(255, 255, 255, 0.85);
            box-shadow: 0 0 4px rgba(0,0,0,0.5);
        }
        .ch-top { width: 2px; height: 7px; top: 0; left: 11px; }
        .ch-bottom { width: 2px; height: 7px; bottom: 0; left: 11px; }
        .ch-left { width: 7px; height: 2px; left: 0; top: 11px; }
        .ch-right { width: 7px; height: 2px; right: 0; top: 11px; }

        /* Hit Marker Effect */
        #hitMarker {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 28px;
            height: 28px;
            transform: translate(-50%, -50%) rotate(45deg);
            pointer-events: none;
            z-index: 9;
            opacity: 0;
            transition: opacity 0.05s ease-out;
        }

        #hitMarker::before, #hitMarker::after {
            content: '';
            position: absolute;
            background: #ff3333;
            box-shadow: 0 0 8px #ff0000;
        }
        #hitMarker::before { width: 100%; height: 2px; top: 13px; left: 0; }
        #hitMarker::after { width: 2px; height: 100%; top: 0; left: 13px; }

        /* Screen Red Damage Flash */
        #damageFlash {
            position: absolute;
            inset: 0;
            background: radial-gradient(circle, transparent 40%, rgba(255, 0, 0, 0.6) 100%);
            pointer-events: none;
            z-index: 5;
            opacity: 0;
            transition: opacity 0.15s ease-out;
        }

        /* Minimap Radar */
        #minimapContainer {
            position: absolute;
            top: 20px;
            right: 20px;
            width: 140px;
            height: 140px;
            border-radius: 50%;
            background: rgba(5, 10, 20, 0.8);
            border: 2px solid rgba(0, 240, 255, 0.3);
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.2), inset 0 0 15px rgba(0,0,0,0.8);
            overflow: hidden;
            display: none;
            z-index: 10;
        }

        #minimapCanvas {
            width: 100%;
            height: 100%;
        }

        /* Screens & Overlays */
        .screen-overlay {
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at center, rgba(20, 5, 10, 0.92), rgba(2, 2, 5, 0.98));
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            z-index: 20;
            color: #fff;
            text-align: center;
            padding: 20px;
            backdrop-filter: blur(15px);
        }

        .screen-title {
            font-size: clamp(2.8rem, 7vw, 5.5rem);
            font-weight: 900;
            text-transform: uppercase;
            letter-spacing: 6px;
            margin: 0 0 10px 0;
            background: linear-gradient(180deg, #ffffff 30%, #ff3333 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 0 30px var(--primary-glow);
            animation: pulseGlow 3s infinite alternate;
        }

        .screen-sub {
            font-size: 1.1rem;
            color: #aab;
            margin-bottom: 25px;
            letter-spacing: 2px;
        }

        .instructions-box {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-left: 4px solid var(--accent);
            border-radius: 12px;
            padding: 20px 30px;
            max-width: 580px;
            text-align: left;
            margin-bottom: 30px;
            line-height: 1.6;
            font-size: 0.95rem;
            color: #ccd;
        }

        .instructions-box key {
            background: rgba(0, 240, 255, 0.15);
            color: var(--accent);
            padding: 2px 8px;
            border-radius: 4px;
            border: 1px solid rgba(0, 240, 255, 0.3);
            font-weight: bold;
        }

        .btn-primary {
            background: linear-gradient(135deg, #ff3333, #bb0000);
            color: #fff;
            border: none;
            padding: 16px 45px;
            font-size: 1.25rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            border-radius: 50px;
            cursor: pointer;
            box-shadow: 0 10px 30px var(--primary-glow);
            transition: all 0.25s ease;
            position: relative;
            overflow: hidden;
        }

        .btn-primary:hover {
            transform: scale(1.05) translateY(-2px);
            box-shadow: 0 15px 40px rgba(255, 51, 51, 0.8);
        }

        .btn-secondary {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            padding: 12px 28px;
            font-size: 1rem;
            border-radius: 30px;
            cursor: pointer;
            margin: 6px;
            transition: all 0.2s ease;
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.25);
            transform: translateY(-2px);
        }

        /* Wave Banner */
        #waveBanner {
            position: absolute;
            top: 40%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: 3.5rem;
            font-weight: 900;
            color: #fff;
            text-transform: uppercase;
            letter-spacing: 6px;
            text-shadow: 0 0 25px var(--primary-glow);
            pointer-events: none;
            opacity: 0;
            z-index: 15;
            transition: opacity 0.5s ease;
        }

        /* Mobile Touch Controls */
        #touchControls {
            position: absolute;
            bottom: 20px;
            width: 100%;
            display: none;
            justify-content: space-between;
            padding: 0 20px;
            box-sizing: border-box;
            z-index: 12;
            pointer-events: none;
        }

        .touch-joystick {
            width: 110px;
            height: 110px;
            background: rgba(255, 255, 255, 0.1);
            border: 2px solid rgba(255, 255, 255, 0.25);
            border-radius: 50%;
            position: relative;
            pointer-events: auto;
            touch-action: none;
        }

        .touch-thumb {
            width: 45px;
            height: 45px;
            background: rgba(0, 240, 255, 0.5);
            border: 2px solid var(--accent);
            border-radius: 50%;
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            pointer-events: none;
            box-shadow: 0 0 10px var(--accent-glow);
        }

        #shootBtnTouch {
            width: 90px;
            height: 90px;
            background: linear-gradient(135deg, #ff3333, #990000);
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            color: #fff;
            font-weight: bold;
            font-size: 16px;
            letter-spacing: 1px;
            pointer-events: auto;
            box-shadow: 0 0 20px var(--primary-glow);
            border: 2px solid rgba(255, 255, 255, 0.4);
            touch-action: none;
        }

        #viewBtnTouch {
            position: absolute;
            top: 20px;
            right: 170px;
            background: var(--bg-glass);
            border: 1px solid var(--border-glass);
            color: #fff;
            padding: 10px 16px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: bold;
            z-index: 12;
            display: none;
            pointer-events: auto;
        }

        @keyframes pulseGlow {
            0% { text-shadow: 0 0 20px rgba(255,51,51,0.5); }
            100% { text-shadow: 0 0 45px rgba(255,51,51,0.9), 0 0 10px rgba(255,255,255,0.8); }
        }

        @media (max-width: 768px) {
            #hud { top: 10px; left: 10px; }
            .hud-card { min-width: 140px; padding: 8px 14px; }
            .hud-val { font-size: 18px; }
            #weaponSelector { bottom: 110px; padding: 4px; }
            .weapon-btn { padding: 6px 10px; font-size: 11px; }
            #minimapContainer { width: 100px; height: 100px; top: 10px; right: 10px; }
        }