:root {
    --bg-color: #050505;
    --text-color: #e0e0e0;
    --accent-green: #0f0;
    --accent-red: #f00;
    --accent-cyan: #0ff;
    --accent-yellow: #ff0;
    --glass-bg: rgba(20, 20, 20, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-main: 'VT323', monospace;
    --font-ui: 'Roboto Mono', monospace;
}

.hidden {
    display: none !important;
}

* {
    box-sizing: border-box;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

body,
html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    overflow: hidden;
}

#game-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at center, #1a1a1a 0%, #000000 100%);
}

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

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    /* Let clicks pass through to canvas when not on buttons */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* Enable pointer events for interactive UI elements */
#start-screen,
#game-over-screen,
#hud {
    pointer-events: auto;
}

/* Glassmorphism Panel */
.panel {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 0 20px rgba(0, 255, 0, 0.1);
    max-width: 90%;
    width: 400px;
    animation: fadeIn 0.5s ease-out;
}

.glass {
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

/* Typography & Glitch */
h1 {
    font-size: 4rem;
    margin: 0;
    color: var(--accent-green);
    text-shadow: 2px 2px var(--accent-red);
    letter-spacing: 5px;
    position: relative;
}

.glitch {
    position: relative;
}

.glitch::before,
.glitch::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
}

.glitch::before {
    left: 2px;
    text-shadow: -1px 0 var(--accent-red);
    clip: rect(24px, 550px, 90px, 0);
    animation: glitch-anim-2 3s infinite linear alternate-reverse;
}

.glitch::after {
    left: -2px;
    text-shadow: -1px 0 var(--accent-cyan);
    clip: rect(85px, 550px, 140px, 0);
    animation: glitch-anim 2.5s infinite linear alternate-reverse;
}

.subtitle {
    font-family: var(--font-ui);
    font-size: 1rem;
    color: #888;
    margin-bottom: 2rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

/* Buttons */
.btn {
    background: transparent;
    border: 1px solid var(--accent-green);
    color: var(--accent-green);
    padding: 10px 20px;
    font-family: var(--font-main);
    font-size: 1.5rem;
    cursor: pointer;
    margin: 10px;
    width: 80%;
    transition: all 0.2s;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    background: var(--accent-green);
    color: #000;
    box-shadow: 0 0 15px var(--accent-green);
}

.btn:active {
    transform: scale(0.98);
}

/* HUD */
#hud {
    position: absolute;
    top: 20px;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-around;
    padding: 0 20px;
    pointer-events: none;
    /* HUD shouldn't block clicks */
}

.stat-box {
    background: rgba(0, 0, 0, 0.6);
    padding: 5px 15px;
    border-radius: 20px;
    border: 1px solid #333;
    font-size: 1.5rem;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 10px;
}

.stat-box .icon {
    font-size: 1.2rem;
}

#ammo-display {
    color: var(--accent-yellow);
}

/* Animations */
@keyframes glitch-anim {
    0% {
        clip: rect(10px, 9999px, 30px, 0);
        transform: skew(0.5deg);
    }

    20% {
        clip: rect(80px, 9999px, 100px, 0);
        transform: skew(-0.5deg);
    }

    40% {
        clip: rect(10px, 9999px, 50px, 0);
        transform: skew(0.2deg);
    }

    60% {
        clip: rect(40px, 9999px, 90px, 0);
        transform: skew(-0.2deg);
    }

    80% {
        clip: rect(20px, 9999px, 60px, 0);
        transform: skew(0.1deg);
    }

    100% {
        clip: rect(60px, 9999px, 80px, 0);
        transform: skew(-0.1deg);
    }
}

@keyframes glitch-anim-2 {
    0% {
        clip: rect(60px, 9999px, 90px, 0);
        transform: skew(-0.5deg);
    }

    20% {
        clip: rect(10px, 9999px, 40px, 0);
        transform: skew(0.5deg);
    }

    40% {
        clip: rect(50px, 9999px, 80px, 0);
        transform: skew(-0.2deg);
    }

    60% {
        clip: rect(20px, 9999px, 50px, 0);
        transform: skew(0.2deg);
    }

    80% {
        clip: rect(90px, 9999px, 100px, 0);
        transform: skew(-0.1deg);
    }

    100% {
        clip: rect(30px, 9999px, 70px, 0);
        transform: skew(0.1deg);
    }
}

@keyframes pulse {
    0% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }

    100% {
        opacity: 1;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Toast */
#toast {
    position: absolute;
    top: 15%;
    /* Moved to top for better visibility */
    left: 50%;
    transform: translateX(-50%);
    background: rgba(10, 10, 10, 0.3);
    color: #fff;
    padding: 15px 30px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    font-family: var(--font-main);
    font-size: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    z-index: 200;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    pointer-events: none;
    text-shadow: 0 2px 0 #000;
    white-space: nowrap;

    /* Premium Border Effect */
    border-left: 4px solid #fff;
    border-right: 4px solid #fff;

    animation: toastSlideIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

#toast.warning {
    border-color: var(--accent-red);
    color: var(--accent-red);
    box-shadow: 0 0 30px rgba(255, 0, 0, 0.3);
}

#toast.success {
    border-color: var(--accent-yellow);
    color: var(--accent-yellow);
    box-shadow: 0 0 30px rgba(255, 255, 0, 0.3);
}

#toast.info {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.3);
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translate(-50%, -20px) scale(0.9);
    }

    to {
        opacity: 1;
        transform: translate(-50%, 0) scale(1);
    }
}

/* Game Over & Typography */
h2 {
    font-size: 2.5rem;
    color: var(--accent-green);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 3px;
}

.danger-text {
    color: var(--accent-red);
    font-size: 3.5rem;
    margin: 0 0 1rem 0;
    text-shadow: 4px 4px 0px #500;
    animation: pulse 0.5s infinite alternate;
}

.final-score {
    font-size: 2.5rem;
    margin: 2rem 0;
    color: #fff;
    background: rgba(0, 0, 0, 0.5);
    padding: 10px;
    border: 1px solid #333;
}

.final-score span {
    color: var(--accent-yellow);
    font-weight: bold;
    font-size: 3rem;
    vertical-align: middle;
}