body {
  font-family: Arial, sans-serif;
  background-color: white;
  margin: 0;
  padding: 0;
}

.grammarly-desktop-integration {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
  -moz-user-select: none;
  -webkit-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.grammarly-desktop-integration:before {
  content: attr(data-content);
}

#game {
  margin: 20px;
}

.left {
  float: left;
}

.banner {
  padding: 10px;
  margin-bottom: 20px;
  clear: both;
  text-align: center;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

.settings-banner {
  background-color: rgba(208, 208, 208, 0.9);
  padding: 20px;
  margin: 20px 0;
  margin-left: -20px;
  margin-right: -20px;
  width: calc(100% + 40px);
}

.game-problem-area {
  background-color: rgba(208, 208, 208, 0.9);
  padding: 1px 0;
  margin: 200px 0 20px 0;
  width: 100vw;
  text-align: center;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
}

.start {
  text-align: center;
  margin: 20px 0;
}

.problem {
  font-size: 36px;
  margin: 20px 0;
  display: inline-block;
}

.answer {
  margin: 20px 0;
  display: inline-block;
  margin-left: 10px;
}

.answer input {
  font-size: 36px;
  padding: 2px;
  border: 2px solid #333;
  text-align: center;
  width: 180px;
  text-align: left;
}

.problem-line {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.end {
  text-align: center;
  margin: 20px 0;
}

.correct {
  color: green;
}

.settings-section {
  margin: 20px 0;
}

.settings-section h3 {
  margin-bottom: 10px;
  font-size: 16px;
}

.operation-settings {
  margin-left: 20px;
  margin-bottom: 15px;
}

.range-setting {
  margin: 5px 0;
}

.range-setting input {
  width: 50px;
  padding: 2px;
  border: 1px solid #999;
}

.decimal-settings {
  margin-left: 20px;
  margin-top: 10px;
  display: none;
}

.decimal-row {
  margin: 5px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.decimal-row select {
  padding: 2px;
  border: 1px solid #999;
}

.fraction-settings {
  margin-left: 20px;
  margin-top: 10px;
  display: none;
}

.fraction-row {
  margin: 5px 0;
  display: flex;
  align-items: center;
  gap: 10px;
}

.fraction-note {
  font-size: 12px;
  color: #666;
  margin-top: 5px;
  margin-left: 20px;
}

.denominator-settings {
  margin-left: 20px;
  margin-top: 10px;
}

.denominator-settings label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}

.denominator-settings input[type="text"] {
  width: 100%;
  max-width: 400px;
  padding: 5px;
  border: 1px solid #999;
  font-size: 12px;
}

.denominator-note {
  font-size: 11px;
  color: #666;
  margin-top: 3px;
}

button {
  padding: 10px 20px;
  background-color: #f0f0f0;
  border: 2px solid #999;
  cursor: pointer;
  font-size: 14px;
}

button:hover {
  background-color: #e0e0e0;
}

select {
  padding: 5px;
  border: 1px solid #999;
}

.description {
  text-align: center;
  margin: 20px 0;
  font-size: 14px;
  line-height: 1.4;
}

.description a {
  color: #0066cc;
  text-decoration: none;
}

.description a:hover {
  text-decoration: underline;
}

.fraction {
  display: inline-block;
  text-align: center;
  vertical-align: middle;
}

.fraction .numerator {
  display: block;
  border-bottom: 1px solid #000;
  padding-bottom: 2px;
  margin-bottom: 2px;
}

.fraction .denominator {
  display: block;
  padding-top: 2px;
}

.mixed-number {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  vertical-align: middle;
}

.mixed-number .whole {
  font-size: 32px;
}