* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #f1f2f3;
}

.container {
  box-sizing: border-box;
  max-width: 1640px;
  min-width: 1240px;
  width: 100%;
  margin: 25px auto;
  color: #333;
}

.container * {
  box-sizing: border-box;
}

header {
  margin-bottom: 25px;
  text-align: center;
}

header h1 {
  font-size: 2.1rem;
  margin-bottom: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
}

header p {
  font-size: 1rem;
  opacity: 0.9;
}

.calculator {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 20px;
  gap: 20px;
  margin-bottom: 25px;
}

.input-group {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.input-group label {
  width: 100px;
  font-weight: bold;
}

.input-group input {
  flex: 1;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 16px;
}

.button-group {
  display: flex;
  gap: 15px;
  margin-top: 10px;
}
.tip-group{
  position: relative;
  top: -7.5px;
  font-size: 14px;
  color: #8a8a8a;
}
button {
  padding: 13px 42px;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s;
}

.calculate-btn {
  background-color: #e74c3c;
  color: white;
}

.calculate-btn:hover {
  background-color: #c0392b;
}

.copy-btn {
  background-color: #3498db;
  color: white;
}

.copy-btn:hover {
  background-color: #2980b9;
}

.clear-btn {
  background-color: #95a5a6;
  color: white;
}

.clear-btn:hover {
  background-color: #7f8c8d;
}

.result {
  padding: 15px;
  background-color: #f9f9f9;
  border-radius: 5px;
  border-left: 5px solid #e74c3c;
}

.result h3 {
  margin-top: 0;
  color: #e74c3c;
}

.result-value {
  font-size: 24px;
  font-weight: bold;
  margin: 10px 0;
}

.info-section {
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  padding: 20px;
  margin-bottom: 25px;
}

.info-section h2 {
  font-size: 24px;
  margin-bottom: 20px;
}

.info-section h3 {
  color: #2c3e50;
  margin-top: 25px;
}

.info-section p {
  line-height: 1.6;
  margin: 10px 0;
}

.info-section ul {
  padding-left: 20px;
}

.info-section li {
  margin-bottom: 10px;
}

.info-section table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.info-section th,
.info-section td {
  border: 1px solid #ddd;
  padding: 12px;
  text-align: left;
}

.info-section th {
  background-color: #f2f2f2;
}

.info-section tr:nth-child(even) {
  background-color: #f9f9f9;
}

footer {
  text-align: center;
  opacity: 0.8;
  font-size: 14px;
}

.notice {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #2c3e50;
  color: white;
  padding: 15px 30px;
  border-radius: 5px;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 1000;
}

.notice.show {
  opacity: 1;
}

.formula {
  background-color: #f8f9fa;
  padding: 15px;
  border-radius: 5px;
  font-family: monospace;
  border-left: 3px solid #e74c3c;
  margin-top: 15px;
}

.comparison {
  display: flex;
  gap: 20px;
  margin: 20px 0;
}

.comparison-box {
  flex: 1;
  background-color: #f9f9f9;
  padding: 15px;
  border-radius: 5px;
  border: 1px solid #eee;
}

.comparison-box h4 {
  margin-top: 0;
  color: #e74c3c;
}

.error {
  color: #e74c3c;
  font-size: 14px;
  margin-top: 5px;
}