* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

body,
html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #05050a;
    font-family: 'Courier New', Courier, monospace;
    cursor: none;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#ui-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 20px;
}

.hud {
    color: #00ffcc;
    font-size: 1.5rem;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(0, 255, 204, 0.5);
    display: flex;
    justify-content: space-between;
    width: 100%;
}

#crosshair {
    width: 40px;
    height: 40px;
    border: 2px dashed #ff0055;
    border-radius: 50%;
    position: absolute;
    pointer-events: none;
    z-index: 100;
    transform: translate(-50%, -50%);
    animation: rotateCrosshair 4s linear infinite;
    box-shadow: 0 0 8px #ff0055;
}

#crosshair::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 6px;
    height: 6px;
    background: #00ffcc;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    box-shadow: 0 0 10px #00ffcc;
}

@keyframes rotateCrosshair {
    from {
        transform: translate(-50%, -50%) rotate(0deg);
    }

    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.target {
    position: absolute;
    width: 60px;
    height: 60px;
    background: radial-gradient(circle, rgba(0, 255, 204, 0.8) 0%, rgba(0, 0, 0, 0) 70%);
    border: 3px solid #00ffcc;
    border-radius: 50%;
    z-index: 5;
    transform: translate(-50%, -50%) scale(0);
    animation: spawnTarget 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    box-shadow: 0 0 15px #00ffcc;
    pointer-events: auto;
}

.target::after {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border: 2px solid #ff0055;
    border-radius: 50%;
    animation: pulseRing 1.5s infinite linear;
}

@keyframes spawnTarget {
    to {
        transform: translate(-50%, -50%) scale(1);
    }
}

@keyframes pulseRing {
    0% {
        transform: scale(0.6);
        opacity: 0;
    }

    50% {
        opacity: 1;
    }

    100% {
        transform: scale(1.4);
        opacity: 0;
    }
}

.flash {
    animation: flashScreen 0.15s ease-out;
}

@keyframes flashScreen {
    0% {
        background: rgba(255, 0, 85, 0.2);
    }

    100% {
        background: transparent;
    }
}

#game-over-screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(5, 5, 10, 0.9);
    z-index: 20;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: #ff0055;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
}

#game-over-screen.visible {
    opacity: 1;
    pointer-events: auto;
}

.btn {
    margin-top: 20px;
    padding: 12px 30px;
    background: transparent;
    border: 2px solid #00ffcc;
    color: #00ffcc;
    font-size: 1.2rem;
    font-family: inherit;
    font-weight: bold;
    cursor: none;
    text-shadow: 0 0 5px #00ffcc;
    box-shadow: 0 0 10px rgba(0, 255, 204, 0.2);
    transition: all 0.3s;
}

.btn:hover {
    background: #00ffcc;
    color: #05050a;
    box-shadow: 0 0 25px #00ffcc;
}