:root {
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --accent-color: #4da8da;
  --accent-hover: #3b8ab8;
  --board-bg: #1e1e1e;
  --board-border: #333;
  --block-bg: #4da8da;
  --block-text: #121212;
  --floor-bg: #383838;
  --success-color: #4CAF50;
  --error-color: #F44336;
}

body {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
  width: 100vw;
  overflow-x: hidden;
}

header {
  width: 100%;
  background-color: var(--board-bg);
  border-bottom: 2px solid var(--board-border);
  padding: 15px 0;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0,0,0,0.5);
  margin-bottom: 20px;
}

header img.logo {
  height: 60px;
  vertical-align: middle;
}

h1, h2, h3 {
  text-align: center;
  color: var(--text-color);
}

a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: bold;
  font-size: 1.2rem;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Form Styles */
form {
  display: flex;
  flex-direction: column;
  gap: 20px;
  background-color: var(--board-bg);
  padding: 40px;
  border-radius: 15px;
  border: 1px solid var(--board-border);
  width: 400px;
  max-width: 90vw;
  margin-top: 20px;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);
}

label {
  font-size: 1.2rem;
  font-weight: bold;
}

select, input[type="number"] {
  padding: 15px;
  border-radius: 8px;
  border: 1px solid #555;
  background-color: #2c2c2c;
  color: var(--text-color);
  font-size: 1.2rem;
}

/* Button Styles */
button {
  background-color: var(--accent-color);
  color: var(--block-text);
  border: none;
  border-radius: 8px;
  padding: 15px 25px;
  font-size: 1.3rem;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s, box-shadow 0.2s;
}

button:hover:not(:disabled) {
  background-color: var(--accent-hover);
}

button:active:not(:disabled) {
  transform: scale(0.98);
}

button:disabled {
  cursor: default;
  opacity: 0.8;
}

/* Screens */
#start-screen, #end-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: 30px;
  width: 100%;
}

#game-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  flex-grow: 1;
}

/* Game Board */
#score {
  font-size: 2rem;
  font-weight: bold;
  margin-bottom: 15px;
  color: var(--accent-color);
}

#game-board {
  position: relative;
  width: 500px; /* Increased from 300px */
  max-width: 95vw;
  height: 600px; /* Increased from 500px */
  max-height: 60vh;
  border: 4px solid var(--board-border);
  background-color: var(--board-bg);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.block {
  position: absolute;
  width: 100%;
  height: 40px; /* Increased to match new board size */
  line-height: 40px;
  text-align: center;
  font-size: 24px; /* Larger font */
  font-weight: bold;
  background-color: var(--block-bg);
  color: var(--block-text);
  box-shadow: inset 0 -4px 0 rgba(0,0,0,0.2);
  border-radius: 5px;
}

.floor {
  position: absolute;
  bottom: 0;
  width: 100%;
  background-color: var(--floor-bg);
  transition: height 0.2s ease-out;
  border-top: 3px solid #555;
}

/* Answers Area */
#question-container {
  margin-top: 30px;
  text-align: center;
  width: 100%;
}

#question {
  font-size: 2.5rem;
  margin: 15px 0;
  color: var(--accent-color);
  transition: color 0.3s;
}

.answers {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.answer-btn {
  min-width: 120px;
  padding: 20px;
  font-size: 1.8rem;
  border-radius: 12px;
}

.answer-btn.correct {
  background-color: var(--success-color);
  color: white;
  box-shadow: 0 0 15px var(--success-color);
  animation: pulse-success 0.5s ease;
}

.answer-btn.wrong {
  background-color: var(--error-color);
  color: white;
  box-shadow: 0 0 15px var(--error-color);
  animation: shake-error 0.5s ease;
}

#final-score {
  font-size: 2rem;
  margin: 30px 0;
  text-align: center;
}

/* Animations */
@keyframes pulse-success {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

@keyframes shake-error {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-10px); }
  50% { transform: translateX(10px); }
  75% { transform: translateX(-10px); }
}