* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, sans-serif;
  background: linear-gradient(135deg, #667eea, #764ba2);
  margin: 0;
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  background: #ffffff;
  padding: 35px;
  border-radius: 16px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

h1 {
  text-align: center;
  margin-bottom: 30px;
  color: #2c3e50;
}

.lang-btn {
  float: right;
  background: #6c5ce7;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 14px;
}

button {
  padding: 12px 24px;
  font-size: 16px;
  background: linear-gradient(135deg, #0984e3, #6c5ce7);
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
}

button:hover {
  opacity: 0.9;
}

.center {
  text-align: center;
  margin-top: 20px;
}

.question {
  background: #f7f9fc;
  padding: 20px;
  margin-bottom: 18px;
  border-radius: 12px;
  border-left: 5px solid #6c5ce7;
}

.question p {
  font-weight: 600;
}

.correct {
  color: #00b894;
  font-weight: bold;
}

.wrong {
  color: #d63031;
  font-weight: bold;
}

#result {
  margin-top: 30px;
  padding: 20px;
  border-radius: 12px;
  background: #ecf0ff;
  text-align: center;
}

canvas {
  margin-top: 40px;
  background: #f8f9ff;
  padding: 20px;
  border-radius: 12px;
}