* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #f1f2f3;
}

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

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

header {
  position: relative;
  margin-bottom: 20px;
  text-align: center;
}

header h1 {
  font-size: 32px;
  margin-bottom: 5px;
}

header p {
  font-size: 16px;
  line-height: 1.6;
}

.container h2{
  line-height: 1;
  margin-bottom: 15px;
  font-size: 24px;
}

.calculator {
  display: flex;
  gap: 20px;
  margin-bottom: 25px;
}

.input-section,
.result-section {
  flex: 1;
  background-color: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: bold;
  color: #555;
}

input,
select {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 5px;
  font-size: 1rem;
}

button {
  background-color: #ff7e5f;
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: bold;
  transition: background-color 0.3s;
  display: block;
  width: 100%;
}

button:hover {
  background-color: #ff6b47;
}

.result-box {
  text-align: center;
  padding: 40px 15px;
  background-color: #f9f9f9;
  border-radius: 5px;
}

.human-age {
  font-size: 2.8rem;
  font-weight: bold;
  color: #ff7e5f;
  margin: 25px 0;
}

.comparison-table {
  background-color: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  margin-bottom: 30px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

th,
td {
  padding: 10px 15px;
  text-align: center;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: #f8f8f8;
  font-weight: bold;
}

tr:hover {
  background-color: #f9f9f9;
}

.features {
  background-color: #fff;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  margin-bottom: 25px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
}

.feature-item {
  text-align: center;
  padding: 20px;
  background-color: #f9f9f9;
  border-radius: 8px;
}

.feature-item h3{
  font-size: 18px;
  margin-bottom: 10px;
}

.feature-emoji {
  font-size: 2.5rem;
  margin-bottom: 15px;
}

footer {
  text-align: center;
  color: #666;
  font-size: 0.9rem;
}

.notice {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #333;
  color: white;
  padding: 15px 25px;
  border-radius: 5px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 1000;
}

.notice.show {
  opacity: 1;
}