:root {
  --primary: #6c5ce7;
  --secondary: #a29bfe;
  --accent: #413f59;
  --dark: #2d3436;
  --score: #7ac69a;
  --light: #f5f6fa;
  --correct: #00b894;
  --wrong: #d63031;
  --loading-bg: #2d3436;
  --timer: #00cec9;
  --progressbar: #a29bfe;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--light);
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--loading-bg);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 100;
  transition: opacity 0.5s;
}

.loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

.logo {
  width: 150px;
  height: 150px;
  margin-bottom: 30px;
  background-color: var(--accent);
  border-radius: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 3rem;
  font-weight: bold;
  color: white;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.loading-text {
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.loading-bar {
  width: 200px;
  height: 10px;
  background-color: rgba(255, 255, 255, 0.2);
  border-radius: 5px;
  overflow: hidden;
}

.loading-progress {
  height: 100%;
  width: 0%;
  background-color: var(--accent);
  transition: width 0.3s;
}

/* Start Screen */
.start-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 50;
  transition: opacity 0.5s;
}

.start-screen.hidden {
  opacity: 0;
  pointer-events: none;
}

.game-title {
  font-size: 3rem;
  margin-bottom: 20px;
  text-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
}

.game-description {
  font-size: 1.2rem;
  margin-bottom: 40px;
  text-align: center;
  max-width: 80%;
  line-height: 1.5;
}

.mode-buttons {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 80%;
  max-width: 300px;
}

.mode-button {
  background-color: var(--accent);
  color: white;
  border: none;
  padding: 15px 40px;
  font-size: 1.3rem;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.mode-button:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

/* Game Container */
.game-container {
  background-color: rgba(45, 52, 54, 0.9);
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  width: 90%;
  max-width: 500px;
  padding: 30px;
  text-align: center;
  position: relative;
  overflow: hidden;
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.5s;
}

.game-container.active {
  opacity: 1;
  transform: scale(1);
}

.header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 30px;
  font-size: 1.2rem;
  position: relative;
}

.home-button {
  position: absolute;
  left: 0;
  top: 0;
  background: none;
  border: none;
  color: var(--secondary);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color 0.3s;
}

.home-button:hover {
  color: var(--accent);
}

.score {
  color: var(--score);
  font-weight: bold;
  margin-left: 30px;
}

.question-number {
  color: var(--secondary);
}

.timer-container {
  color: var(--timer);
  font-weight: bold;
  font-size: 1.2rem;
  margin-bottom: 10px;
  height: 30px;
}

.question {
  font-size: 2.5rem;
  margin: 20px 0;
  min-height: 80px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
  margin-bottom: 20px;
}

.option {
  background-color: var(--dark);
  border: 2px solid var(--secondary);
  border-radius: 10px;
  padding: 15px;
  font-size: 1.5rem;
  cursor: pointer;
  transition: all 0.3s;
}

.option:hover {
  background-color: var(--primary);
  transform: translateY(-3px);
}

.feedback {
  height: 30px;
  font-size: 1.2rem;
  margin-bottom: 10px;
  font-weight: bold;
}

.correct {
  color: var(--correct);
}

.wrong {
  color: var(--wrong);
}

.progress-bar {
  height: 8px;
  background-color: var(--dark);
  border-radius: 4px;
  margin-top: 20px;
  overflow: hidden;
}

.progress {
  height: 100%;
  background-color: var(--progressbar);
  width: 0%;
  transition: width 0.3s;
}

/* Ad Screen */
.ad-screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 10;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s;
}

.ad-screen.active {
  opacity: 1;
  pointer-events: all;
}

.ad-content {
  background-color: var(--dark);
  padding: 20px;
  border-radius: 15px;
  text-align: center;
  max-width: 80%;
}

.ad-title {
  color: var(--accent);
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.ad-message {
  margin-bottom: 30px;
  font-size: 1.1rem;
}

.ad-timer {
  color: var(--secondary);
  font-size: 1.2rem;
  margin-bottom: 20px;
}

.close-ad {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s;
}

.close-ad:hover {
  background-color: var(--accent);
}

/* Game Over Screen */
.game-over {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 10;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s;
}

.game-over.active {
  opacity: 1;
  pointer-events: all;
}

.game-over h2 {
  color: var(--accent);
  font-size: 2rem;
  margin-bottom: 20px;
}

.final-score {
  font-size: 1.5rem;
  margin-bottom: 30px;
}

.restart {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 15px 30px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 1.2rem;
  transition: all 0.3s;
}

.restart:hover {
  background-color: var(--accent);
  transform: scale(1.05);
}

@media (max-width: 500px) {
  .game-title {
    font-size: 2.5rem;
  }

  .question {
    font-size: 2rem;
  }

  .options {
    grid-template-columns: 1fr;
  }

  .mode-buttons {
    width: 90%;
  }

  .home-button {
    font-size: 1.2rem;
  }

  .score {
    margin-left: 25px;
  }
}