:root {
    --bullet-color: #00FFFF;
    --ship-color: #FFFFFF;
    --asteroid-color: #FFFFFF;
}

body {
    margin: 0;
    font-family: "Pixelify Sans", sans-serif;
    background: black;
    color: lightgrey;
}

h1{
	color:white;
}

canvas {
    background: black;
    display: block;
    margin: 0 auto;
	z-index:1;
}

#score {
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 24px;
	z-index:10;
}

.screen {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    font-size: 36px;
    transition: opacity 0.5s ease-in-out;
    opacity: 0;
	z-index:100;
}

.screen.show {
    display: flex;
    opacity: 1;
}

button {
    border: 2px solid white;
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 24px;
    background: black;
    color: white;
    border-radius: 5px;
    width: 150px;
    cursor: pointer;
    transition: background 0.3s, color 0.3s;
}

button:hover {
    background: darkgrey;
    color: black;
}

button:focus {
    outline: 2px solid #00FFFF;
}


/* FIREWORKS */ 
@keyframes firework {
  0% { transform: translate(var(--x), var(--initialY)); width: var(--initialSize); opacity: 1; }
  50% { width: 0.5vmin; opacity: 1; }
  100% { width: var(--finalSize); opacity: 0; }
}

/* @keyframes fireworkPseudo {
  0% { transform: translate(-50%, -50%); width: var(--initialSize); opacity: 1; }
  50% { width: 0.5vmin; opacity: 1; }
  100% { width: var(--finalSize); opacity: 0; }
}
 */
.firework,
.firework::before,
.firework::after
{
  --initialSize: 0.5vmin;
  --finalSize: 45vmin;
  --particleSize: 0.2vmin;
  --color1: yellow;
  --color2: khaki;
  --color3: white;
  --color4: lime;
  --color5: gold;
  --color6: mediumseagreen;
  --y: -30vmin;
  --x: -50%;
  --initialY: 60vmin;
  content: "";
  animation: firework 2s infinite;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, var(--y));
  width: var(--initialSize);
  aspect-ratio: 1;
  background: 
    /*
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 0% 0%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 100% 0%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 100% 100%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 0% 100%,
    */
    
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 50% 0%,
    radial-gradient(circle, var(--color2) var(--particleSize), #0000 0) 100% 50%,
    radial-gradient(circle, var(--color3) var(--particleSize), #0000 0) 50% 100%,
    radial-gradient(circle, var(--color4) var(--particleSize), #0000 0) 0% 50%,
    
    /* bottom right */
    radial-gradient(circle, var(--color5) var(--particleSize), #0000 0) 80% 90%,
    radial-gradient(circle, var(--color6) var(--particleSize), #0000 0) 95% 90%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 90% 70%,
    radial-gradient(circle, var(--color2) var(--particleSize), #0000 0) 100% 60%,
    radial-gradient(circle, var(--color3) var(--particleSize), #0000 0) 55% 80%,
    radial-gradient(circle, var(--color4) var(--particleSize), #0000 0) 70% 77%,
    
    /* bottom left */
    radial-gradient(circle, var(--color5) var(--particleSize), #0000 0) 22% 90%,
    radial-gradient(circle, var(--color6) var(--particleSize), #0000 0) 45% 90%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 33% 70%,
    radial-gradient(circle, var(--color2) var(--particleSize), #0000 0) 10% 60%,
    radial-gradient(circle, var(--color3) var(--particleSize), #0000 0) 31% 80%,
    radial-gradient(circle, var(--color4) var(--particleSize), #0000 0) 28% 77%,
    radial-gradient(circle, var(--color5) var(--particleSize), #0000 0) 13% 72%,
    
    /* top left */
    radial-gradient(circle, var(--color6) var(--particleSize), #0000 0) 80% 10%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 95% 14%,
    radial-gradient(circle, var(--color2) var(--particleSize), #0000 0) 90% 23%,
    radial-gradient(circle, var(--color3) var(--particleSize), #0000 0) 100% 43%,
    radial-gradient(circle, var(--color4) var(--particleSize), #0000 0) 85% 27%,
    radial-gradient(circle, var(--color5) var(--particleSize), #0000 0) 77% 37%,
    radial-gradient(circle, var(--color6) var(--particleSize), #0000 0) 60% 7%,
    
    /* top right */
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 22% 14%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 45% 20%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 33% 34%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 10% 29%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 31% 37%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 28% 7%,
    radial-gradient(circle, var(--color1) var(--particleSize), #0000 0) 13% 42%
    ;
  background-size: var(--initialSize) var(--initialSize);
  background-repeat: no-repeat;
}

.firework::before {
  --x: -50%;
  --y: -50%;
  --initialY: -50%;
/*   transform: translate(-20vmin, -2vmin) rotate(40deg) scale(1.3) rotateY(40deg); */
  transform: translate(-50%, -50%) rotate(40deg) scale(1.3) rotateY(40deg);
/*   animation: fireworkPseudo 2s infinite; */
}

.firework::after {
  --x: -50%;
  --y: -50%;
  --initialY: -50%;
/*   transform: translate(44vmin, -50%) rotate(170deg) scale(1.15) rotateY(-30deg); */
  transform: translate(-50%, -50%) rotate(170deg) scale(1.15) rotateY(-30deg);
/*   animation: fireworkPseudo 2s infinite; */
}

.firework:nth-of-type(2) {
  --x: 30vmin;
}

.firework:nth-of-type(2),
.firework:nth-of-type(2)::before,
.firework:nth-of-type(2)::after {
  --color1: pink;
  --color2: violet;
  --color3: fuchsia;
  --color4: orchid;
  --color5: plum;
  --color6: lavender;  
  --finalSize: 40vmin;
  left: 30%;
  top: 60%;
  animation-delay: -0.25s;
}

.firework:nth-of-type(3) {
  --x: -30vmin;
  --y: -50vmin;
}

.firework:nth-of-type(3),
.firework:nth-of-type(3)::before,
.firework:nth-of-type(3)::after {
  --color1: cyan;
  --color2: lightcyan;
  --color3: lightblue;
  --color4: PaleTurquoise;
  --color5: SkyBlue;
  --color6: lavender;
  --finalSize: 35vmin;
  left: 70%;
  top: 60%;
  animation-delay: -0.4s;
}