:root {
  --font-family: "Inter", sans-serif;

  /* Background Colors */
  --bg-body: #e0f7fa;
  --bg-overlay: rgba(0, 0, 0, 0.2);
  --bg-game-gradient-start: #80deea;
  --bg-game-gradient-end: #4dd0e1;
  --bg-problem-area: #e1f5fe;
  --bg-progress-container: #b3e5fc;
  --bg-progress-bar: #00bcd4;
  --bg-score: #f44336;
  --bg-menu-button: #ffeb3b;
  --bg-option-button: #4caf50;
  --bg-option-button-hover: #43a047;
  --bg-modal: rgba(0, 0, 0, 0.5);
  --bg-pause-resume: #4caf50;
  --bg-pause-resume-hover: #388e3c;
  --bg-pause-quit: #f44336;
  --bg-pause-quit-hover: #d32f2f;
  --bg-modal-white: white;

  /* Text Colors */
  --text-light: white;
  --text-dark: #212121;
  --text-muted: #333;

  /* Others */
  --radius-small: 5px;
  --radius-medium: 10px;
  --radius-large: 15px;
  --radius-xl: 20px;
  --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 4px 8px rgba(0, 0, 0, 0.1);
  --confetti-color: #f43f5e;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-body);
  background-image: url("../assets/images/background.jpg");
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
  background-attachment: fixed;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background: var(--bg-overlay);
  z-index: 0;
}

.main-container {
  position: relative;
  z-index: 1;
}

.game-container {
  background: linear-gradient(
    135deg,
    var(--bg-game-gradient-start),
    var(--bg-game-gradient-end)
  );
  padding: 30px 30px 20px 30px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  width: 90%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 455px;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  margin-bottom: 20px;
}

.score-panel {
  background-color: var(--bg-score);
  color: var(--text-light);
  padding: 10px 20px;
  border-radius: var(--radius-xl);
  font-weight: bold;
}

.menu-button {
  background-color: var(--bg-menu-button);
  color: var(--text-muted);
  border: none;
  padding: 10px;
  border-radius: var(--radius-medium);
  cursor: pointer;
  font-weight: bold;
}

.problem-area {
  background-color: var(--bg-problem-area);
  color: var(--text-dark);
  padding: 30px;
  border-radius: var(--radius-large);
  text-align: center;
  font-size: 2.5em;
  font-weight: bold;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.progress-bar-container {
  background-color: var(--bg-progress-container);
  width: 100%;
  height: 10px;
  border-radius: var(--radius-small);
  overflow: hidden;
  margin-bottom: 20px;
}

.progress-bar {
  background-color: var(--bg-progress-bar);
  height: 100%;
  width: 100%;
  border-radius: var(--radius-small);
  transition: width 0.3s ease;
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  width: 100%;
}

.option-button {
  background-color: var(--bg-option-button);
  color: var(--text-light);
  border: none;
  padding: 15px;
  border-radius: var(--radius-medium);
  font-size: 1.2em;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.option-button:hover {
  background-color: var(--bg-option-button-hover);
}

.fade-in {
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.hidden {
  display: none !important;
}

#feedback {
  margin-top: 20px;
  font-size: 1.1em;
  font-weight: bold;
  text-align: center;
}

#wrongCountDisplay {
  color: var(--bg-score);
  text-align: center;
}

#gameOverScreen,
#levelUpModal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--bg-modal);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 10;
}

.confetti-container {
  position: absolute;
  top: -10px;
  left: 50%;
  width: 100%;
  height: 100%;
  pointer-events: none;
  transform: translateX(-50%);
  overflow: visible;
}

.confetti-dot {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--confetti-color);
  opacity: 0;
  animation: confetti-blast 1s forwards;
}

@keyframes confetti-blast {
  0% {
    opacity: 1;
    transform: translate(0, 0) scale(1);
  }
  100% {
    opacity: 0;
    transform: translate(var(--x), var(--y)) scale(0);
  }
}

.modal-content {
  background-color: var(--bg-modal-white);
  padding: 30px;
  border-radius: var(--radius-large);
  text-align: center;
}

/* Pause Menu Styles */
#pauseMenu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-modal);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 30;
}
#pauseMenu.hidden {
  display: none;
}
.modal-content.pause {
  padding: 20px;
  width: 300px;
  border-radius: var(--radius-large);
}
.pause button {
  width: 100%;
  padding: 12px;
  margin-top: 10px;
  border: none;
  border-radius: var(--radius-medium);
  font-weight: bold;
  cursor: pointer;
}
.pause button.resume {
  background-color: var(--bg-pause-resume);
  color: var(--text-light);
}
.pause button.resume:hover {
  background-color: var(--bg-pause-resume-hover);
}
.pause button.quit {
  background-color: var(--bg-pause-quit);
  color: var(--text-light);
}
.pause button.quit:hover {
  background-color: var(--bg-pause-quit-hover);
}

@keyframes bounce-slow {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.animate-bounce-slow {
  animation: bounce-slow 1.6s infinite;
}

.hover\:shadow-glow:hover {
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.7), 0 0 40px rgba(6, 182, 212, 0.4);
}

@keyframes mathPulse {
  0%,
  100% {
    transform: scale(1);
    opacity: 0.5;
  }
  50% {
    transform: scale(1.4);
    opacity: 1;
  }
}

@keyframes flicker {
  0%,
  19%,
  21%,
  23%,
  25%,
  54%,
  56%,
  100% {
    opacity: 1;
  }
  20%,
  22%,
  24%,
  55% {
    opacity: 0;
  }
}

.symbol {
  animation: mathPulse 1.2s ease-in-out infinite;
  display: inline-block;
}

.symbol:nth-child(1) {
  animation-delay: 0s;
}
.symbol:nth-child(2) {
  animation-delay: 0.2s;
}
.symbol:nth-child(3) {
  animation-delay: 0.4s;
}
.symbol:nth-child(4) {
  animation-delay: 0.6s;
}

.vs-text {
  animation: flicker 1.5s infinite;
  font-weight: 900;
}