body {
  margin: 0;
  padding: 20px;
  font-family: Arial, sans-serif;
  background-color: #f0f8ff;
}

.game-title {
  text-align: center;
  font-size: 36px;
  color: #4a90e2;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
  margin-bottom: 20px;
  font-weight: bold;
}

.game-container {
  max-width: 800px;
  margin: 0 auto;
}

.collected-area {
  background-color: #fff;
  padding: 15px;
  border: 2px solid #333;
  border-radius: 10px;
  margin-bottom: 20px;
  font-size: 18px;
  min-height: 30px;
  display: flex;
  align-items: center;
}

.collected-label {
  font-weight: bold;
  color: #333;
}

#collected-flag {
  color: #ff4444;
  font-weight: bold;
  margin-left: 10px;
}

.tank {
  width: 100%;
  height: 400px;
  border: 5px solid #4a90e2;
  border-radius: 15px;
  background: linear-gradient(to bottom, #87ceeb 0%, #4682b4 100%);
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.flag-container {
  width: 100%;
  height: 100%;
  position: relative;
}

.flag-char {
  position: absolute;
  font-size: 24px;
  font-weight: bold;
  color: #ff4444;
  cursor: pointer;
  user-select: none;
  padding: 10px;
  border-radius: 8px;
  transition: all 0.2s ease;
  filter: blur(3px);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(5px);
  min-width: 20px;
  min-height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.flag-char:hover {
  transform: scale(1.1);
  filter: blur(2px);
}

.flag-char.collected {
  opacity: 0;
  transform: scale(0);
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

.result-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.result-overlay.show {
  display: flex;
}

.result-content {
  background: white;
  padding: 40px;
  border-radius: 20px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  animation: resultPop 0.5s ease-out;
}

.result-text {
  font-size: 48px;
  font-weight: bold;
  margin-bottom: 30px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.result-text.correct {
  color: #4caf50;
  animation: celebration 1s ease-in-out infinite;
}

.result-text.incorrect {
  color: #f44336;
  animation: shake 0.5s ease-in-out;
}

.restart-btn {
  padding: 15px 30px;
  font-size: 18px;
  background: #4a90e2;
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.restart-btn:hover {
  background: #357abd;
  transform: scale(1.05);
}

@keyframes resultPop {
  0% {
    transform: scale(0.5);
    opacity: 0;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes celebration {
  0%,
  100% {
    transform: scale(1) rotate(0deg);
  }
  25% {
    transform: scale(1.1) rotate(-5deg);
  }
  75% {
    transform: scale(1.1) rotate(5deg);
  }
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-10px);
  }
  75% {
    transform: translateX(10px);
  }
}