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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.container {
  background: white;
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
  width: 100%;
  max-width: 450px;
}

h1 {
  text-align: center;
  color: #333;
  margin-bottom: 20px;
  font-size: 1.5rem;
}

#score {
  text-align: center;
  color: #666;
  font-size: 1.1rem;
  margin-bottom: 25px;
}

.sentence {
  font-size: 1.3rem;
  color: #333;
  margin-bottom: 30px;
  line-height: 1.6;
  min-height: 50px;
}

.blank {
  color: #667eea;
  font-weight: bold;
  border-bottom: 2px solid #667eea;
  padding: 0 5px;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.options button {
  padding: 14px 20px;
  font-size: 1.1rem;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  background: white;
  color: #333;
  cursor: pointer;
  transition: all 0.2s ease;
}

.options button:hover:not(:disabled) {
  border-color: #667eea;
  background: #f8f8ff;
}

.options button:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.options button.correct {
  border-color: #22c55e;
  background: #dcfce7;
  color: #166534;
}

.options button.wrong {
  border-color: #ef4444;
  background: #fee2e2;
  color: #991b1b;
}

.feedback {
  text-align: center;
  margin-top: 20px;
  font-size: 1.1rem;
  font-weight: bold;
  min-height: 28px;
}

.feedback.correct {
  color: #22c55e;
}

.feedback.wrong {
  color: #ef4444;
}

.btn {
  width: 100%;
  margin-top: 25px;
  padding: 14px;
  font-size: 1.1rem;
  background: #667eea;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.btn:hover:not(:disabled) {
  background: #5a67d8;
}

.btn:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.btn.restart {
  background: #764ba2;
}

.btn.restart:hover:not(:disabled) {
  background: #6b3f8f;
}