body {
  font-family: Arial, sans-serif;
  max-width: 700px;
  margin: auto;
  padding: 20px;
  background: #f5f5f5;
}

h1, h2 {
  text-align: center;
}

#filter-container,
#quiz-container,
#score-container,
#history-container {
  background: white;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 20px;
}

label {
  margin-right: 10px;
}

select {
  margin-right: 20px;
  padding: 5px;
}

button {
  margin-top: 10px;
  padding: 8px 14px;
  cursor: pointer;
}

#options button {
  display: block;
  width: 100%;
  margin-bottom: 8px;
  text-align: left;
}

#feedback {
  margin-top: 10px;
  font-weight: bold;
  min-height: 1.5em;
}

.correct {
  color: green;
}

.incorrect {
  color: red;
}

#summary table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 10px;
}

#summary th, #summary td {
  border: 1px solid #ccc;
  padding: 6px 8px;
  text-align: left;
}

.correct-row {
  background-color: #d0f0d0;
}

.incorrect-row {
  background-color: #f9d0d0;
}

#history-list {
  list-style: none;
  padding-left: 0;
}

#history-list li {
  background: #eee;
  margin-bottom: 6px;
  padding: 8px;
  border-radius: 4px;
  cursor: pointer;
}

#history-list li:hover {
  background: #ddd;
}