* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #f1f2f3;
}

.container {
  box-sizing: border-box;
  width: 100%;
  max-width: 1560px;
  min-width: 1240px;
  margin: 20px auto;
  color: #333;
}

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

header {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 25px;
}

header h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
}

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

.container h2{
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 15px;
}

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

.input-section {
  flex: 1;
  background: #fff;
  padding: 20px;
  border-radius: 8px;
}

.result-section {
  flex: 1;
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
}

.group-box{
  display: grid;
  grid-template-columns: repeat(2,1fr);
  gap: 20px;
  margin-bottom: 25px;
}


.container label {
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
  font-weight: bold;
  color: #34495e;
}

.container input,
.container select {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
}

.buttons {
  display: flex;
  gap: 20px;
}

button {
  flex: 1;
  text-align: center;
  padding: 12px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  font-weight: bold;
  color: white;
  transition: all 0.3s;
}

.calculate-btn {
  background: #3498db;
  flex: 1.5;
}

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

.copy-btn {
  background: #2ecc71;
}

.copy-btn:hover {
  background: #27ae60;
}

.clear-btn {
  background: #e74c3c;
}

.clear-btn:hover {
  background: #c0392b;
}

.result-box {
  text-align: center;
}

.result-value {
  font-size: 28px;
  font-weight: bold;
  color: #2c3e50;
  margin: 25px 0;
  padding: 30px 10px;
  background: #ffe3e3;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
}

.blood-pressure-info {
  margin-bottom: 25px;
  background: #fff;
  padding: 20px;
  border-radius: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 15px 0;
}

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

th {
  background: #f2f2f2;
}

.notice {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 15px 25px;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  border-radius: 5px;
  z-index: 1000;
  display: none;
}

footer {
  text-align: center;
  font-size: 15px;
  color: #7f8c8d;
}

.features {
  display: flex;
  gap: 20px;
  margin-bottom: 25px;
  text-align: left;
}

.feature {
  flex: 1;
  padding: 20px;
  background: #fff;
  border-radius: 8px;
}

.feature h3 {
  color: #3498db;
  margin-bottom: 15px;
  font-size: 20px;
}

.instructions {
  background: #fff;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 25px;
}
.instructions p{
  margin-top: 10px;
}

.instructions h3 {
  color: #e67e22;
  margin-bottom: 15px;
}

.example {
  background: #e8f4fc;
  padding: 15px;
  border-radius: 8px;
  margin-top: 15px;
}