* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  background: #000;
  overflow: hidden;
  font-family: sans-serif;
  color: #fff;
}

#game-container {
  position: relative;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center center;
  overflow: hidden;
}

#spaceship-wrapper {
  position: absolute;
  pointer-events: none;
}

#spaceship {
  position: relative;
  width: 40px;
  height: 50px;
}

.ship-body {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 20px solid transparent;
  border-right: 20px solid transparent;
  border-bottom: 30px solid #0ff;
  filter: drop-shadow(0 0 5px #0ff);
}

.ship-mid {
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translate(-50%, 0);
  width: 16px;
  height: 20px;
  background: #099;
  filter: drop-shadow(0 0 4px #0ff);
}

#ship-thruster {
  position: absolute;
  top: 60%;
  left: 50%;
  transform: translate(-50%, 0);
  width: 10px;
  height: 20px;
  background: linear-gradient(#f00, transparent);
  filter: drop-shadow(0 0 6px #f00);
  animation: thrusterIdle 0.4s infinite alternate;
}

@keyframes thrusterIdle {
  0% {
    height: 15px;
    box-shadow: 0 0 10px #f00;
  }

  100% {
    height: 25px;
    box-shadow: 0 0 15px #f90;
  }
}

.boost {
  animation: thrusterBoost 0.2s infinite alternate !important;
}

@keyframes thrusterBoost {
  0% {
    height: 30px;
    box-shadow: 0 0 15px 4px #f00;
  }

  100% {
    height: 45px;
    box-shadow: 0 0 25px 8px #ff0;
  }
}

.laser {
  position: absolute;
  width: 4px;
  height: 20px;
  background: linear-gradient(#ff0, #f80);
  box-shadow: 0 0 6px #ff0;
  pointer-events: none;
}

.laser-spread {
  position: absolute;
  width: 4px;
  height: 15px;
  background: linear-gradient(#0f0, #080);
  box-shadow: 0 0 6px #0f0;
  pointer-events: none;
}

.missile {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: radial-gradient(#fff, #0ff);
  box-shadow: 0 0 8px #0ff;
  pointer-events: none;
}

.shockwave {
  position: absolute;
  width: 20px;
  height: 20px;
  border: 2px solid #f00;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  box-shadow: 0 0 12px 4px #f00;
  pointer-events: none;
  animation: shockExpand 0.4s linear forwards;
}

@keyframes shockExpand {
  0% {
    transform: scale(0.01);
  }

  100% {
    transform: scale(5);
  }
}

.charged-beam {
  position: absolute;
  width: 12px;
  height: 30px;
  background: linear-gradient(#ff0, #f00);
  box-shadow: 0 0 12px #ff0;
  pointer-events: none;
}

.asteroid {
  position: absolute;
  background: #444;
  border: 2px solid #777;
  border-radius: 50%;
  box-shadow: 0 0 10px #222;
  pointer-events: none;
}

.spin {
  animation: spin 6s linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

#ui {
  position: absolute;
  top: 10px;
  left: 10px;
  color: #0ff;
  text-shadow: 0 0 4px #0ff;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

#score-label,
#lives-label {
  font-size: 16px;
}

#lives-container {
  display: inline-block;
}

.life-indicator {
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 3px;
  background: #0f0;
  box-shadow: 0 0 4px #0f0;
}

#weapon-info {
  font-size: 14px;
}

#weapon-cooldown-bar {
  position: relative;
  width: 120px;
  height: 10px;
  background: #222;
  border: 1px solid #0ff;
  overflow: hidden;
}

#weapon-cooldown-fill {
  position: absolute;
  left: 0;
  top: 0;
  width: 0%;
  height: 100%;
  background: linear-gradient(to right, #0ff, #0cc);
  transition: width 0.1s linear;
}

#game-over-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  z-index: 10000;
  display: none;
}

#game-over-overlay h1 {
  font-size: 3rem;
  color: #f33;
  text-shadow: 0 0 6px #fff;
  margin-bottom: 1rem;
}

#final-score {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

#restart-button {
  background: #222;
  color: #0ff;
  border: 2px solid #0ff;
  padding: 8px 16px;
  cursor: pointer;
  text-transform: uppercase;
  transition: background 0.2s;
}

#restart-button:hover {
  background: #0ff;
  color: #222;
}

#instructions-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  z-index: 10000;
}

#instructions-overlay h2 {
  font-size: 2rem;
  color: #0f0;
  margin-bottom: 1rem;
  text-shadow: 0 0 6px #fff;
}

#instructions-content {
  width: 80%;
  max-width: 600px;
  margin-bottom: 1rem;
  line-height: 1.5;
  font-size: 1rem;
  color: #fff;
  text-shadow: 0 0 4px #0ff;
}

#start-game-button {
  background: #222;
  color: #0ff;
  border: 2px solid #0ff;
  padding: 8px 16px;
  cursor: pointer;
  text-transform: uppercase;
  transition: background 0.2s;
}

#start-game-button:hover {
  background: #0ff;
  color: #222;
}

#leaderboard-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10001;
  text-align: center;
  color: #fff;
}

#leaderboard-overlay h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

#leaderboard-list {
  list-style: none;
  padding: 0;
  margin-bottom: 1rem;
}

#leaderboard-list li {
  margin: 0.4rem 0;
}

.leaderboard-btn {
  margin: 0.3rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  background: #222;
  color: #0ff;
  border: 2px solid #0ff;
  text-transform: uppercase;
  transition: background 0.2s;
}

.leaderboard-btn:hover {
  background: #0ff;
  color: #222;
}

#bg-selection-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 10002;
  text-align: center;
}

#bg-selection-overlay h2 {
  color: #fff;
  margin-bottom: 1.5rem;
}

.bg-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.bg-btn {
  padding: 1rem;
  cursor: pointer;
  border: 2px solid #fff;
  background: #333;
  color: #fff;
  text-transform: uppercase;
  transition: background 0.3s;
}

.bg-btn:hover {
  background: #555;
}