/* ===== BASE RESETS & GLOBAL STYLES ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", system-ui, sans-serif;
  text-align: center;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: linear-gradient(135deg, #fff 0%, #f0f0f0 100%);
  color: #333;
  padding-top: 150px; /* Space for fixed header */
  transition: all 0.3s ease;
}

/* ===== DARK MODE STYLES ===== */
body.dark-mode {
  background: linear-gradient(135deg, #121212 0%, #222 100%);
  color: #f0f0f0;
}

/* ===== HEADER STYLES ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 0px 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  flex-wrap: wrap;
}

.dark-mode header {
  background-color: rgba(30, 30, 30, 0.95);
}

header img {
  height: 100px;
  width: auto;
  transition: transform 0.3s;
}

header h1 {
  font-size: 1.5rem;
  background: linear-gradient(to right, #3498db, #2ecc71);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 0 10px;
}

.dark-mode header h1 {
  background: linear-gradient(to right, #3aafff, #4cff8f);
  -webkit-background-clip: text;
  background-clip: text;
}

header > div {
  display: flex;
  gap: 10px;
}

/* Header buttons */
.sound-toggle,
.dark-mode-toggle {
  background: rgba(0, 0, 0, 0.08);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.3s;
  display: grid;
  place-items: center;
}

.dark-mode .sound-toggle,
.dark-mode .dark-mode-toggle {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

/* ===== GAME CONTAINERS ===== */
#start-screen,
#game-screen {
  background: white;
  padding: 2rem;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  margin: 1rem auto;
  width: 95%;
  max-width: 500px;
  transition: all 0.3s;
}

.dark-mode #start-screen,
.dark-mode #game-screen {
  background: #2a2a2a;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

#game-screen {
  display: none;
}

/* ===== GAME ELEMENTS ===== */
#score {
  font-size: 1.3rem;
  font-weight: bold;
  color: #27ae60;
  margin-bottom: 1rem;
}

.timer-container {
  width: 100%;
  margin: 1rem 0;
}

.progress-container {
  width: 100%;
  height: 12px;
  background: rgba(0, 0, 0, 0.05);
  border-radius: 6px;
  margin-top: 8px;
  overflow: hidden;
}

.dark-mode .progress-container {
  background: rgba(255, 255, 255, 0.1);
}

.progress-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(to right, #3498db, #2ecc71);
  border-radius: 6px;
  transition: width 0.1s linear;
}

#question {
  font-size: 2.5rem;
  margin: 1.5rem 0;
  font-weight: bold;
  min-height: 60px;
  color: #2c3e50;
}

.dark-mode #question {
  color: #f0f0f0;
}

/* ===== ANSWER OPTIONS ===== */
#options {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin: 2rem 0;
  flex-wrap: wrap;
}

#options button {
  flex: 1;
  min-width: 80px;
  padding: 1rem;
  font-size: 1.5rem;
  background: linear-gradient(145deg, #3498db, #2ecc71);
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  position: relative;
}

/* Keyboard key indicators (desktop only) */
#options button::after {
  content: attr(data-key);
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.8rem;
  background: rgba(0, 0, 0, 0.3);
  color: white;
  padding: 2px 8px;
  border-radius: 10px;
  display: none; /* Hidden by default */
}

#options button:active {
  transform: scale(0.96);
}

/* ===== KEY HINTS ===== */
.key-hint {
  font-size: 0.9rem;
  color: #7f8c8d;
  margin-top: 1rem;
  font-style: italic;
  display: none; /* Hidden by default */
}

.dark-mode .key-hint {
  color: #aaa;
}

/* Desktop hint */
.key-hint.desktop-hint {
  display: none; /* Will be shown via media query */
}

/* Mobile hint */
.key-hint.mobile-hint {
  display: none; /* Will be shown via media query */
}

/* ===== START BUTTON ===== */
#start-btn {
  padding: 1rem 2rem;
  font-size: 1.3rem;
  background: linear-gradient(145deg, #e74c3c, #f39c12);
  color: white;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  margin-top: 1rem;
}

#start-btn:hover {
  transform: scale(1.03);
}

#start-btn:active {
  transform: scale(0.98);
}

/* ===== FEEDBACK ANIMATION ===== */
.correct-feedback {
  position: fixed;
  font-size: 100px;
  color: #4caf50;
  pointer-events: none;
  animation: fadeInOut 0.5s ease-out;
  z-index: 100;
  text-shadow: 0 0 10px rgba(76, 175, 80, 0.5);
}

@keyframes fadeInOut {
  0% {
    opacity: 0;
    transform: scale(0.5);
  }
  50% {
    opacity: 1;
    transform: scale(1.2);
  }
  100% {
    opacity: 0;
    transform: scale(0.8);
  }
}

/* ===== RESPONSIVE ADJUSTMENTS ===== */
@media (min-width: 769px) {
  /* Show desktop hint and key indicators */
  .key-hint.desktop-hint {
    display: block;
  }
  #options button::after {
    display: block;
  }
}

@media (max-width: 768px) {
  body {
    padding-top: 90px;
  }

  header {
    padding: 10px 5%;
  }

  header img {
    height: 60px;
  }

  header h1 {
    font-size: 1.3rem;
  }

  /* Show mobile hint */
  .key-hint.mobile-hint {
    display: block;
  }

  /* Adjust game elements */
  #question {
    font-size: 2rem;
  }

  #options {
    gap: 10px;
  }

  #options button {
    font-size: 1.4rem;
    padding: 1.2rem 0.5rem;
    min-width: 70px;
  }

  /* Header buttons */
  .sound-toggle,
  .dark-mode-toggle {
    width: 36px;
    height: 36px;
    font-size: 1.1rem;
  }
}

@media (max-width: 480px) {
  #question {
    font-size: 1.8rem;
  }

  #options button {
    font-size: 1.3rem;
    min-width: 60px;
    padding: 1rem 0.5rem;
  }

  #start-btn {
    padding: 1rem 1.5rem;
    font-size: 1.2rem;
  }
}