body {
  font-family: Arial, sans-serif;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
  background-color: #f5f5f5;
}
.container {
  background-color: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
h1 {
  color: #2c3e50;
  border-bottom: 3px solid #3498db;
  padding-bottom: 10px;
}
h2 {
  color: #34495e;
  margin-top: 30px;
}
h3 {
  color: #2980b9;
  margin-top: 20px;
}
.section {
  margin: 20px 0;
  padding: 20px;
  background-color: #ecf0f1;
  border-radius: 5px;
}
.input-group {
  margin: 15px 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
}
.input-group label {
  min-width: 220px;
  font-weight: bold;
  color: #2c3e50;
}
.input-group input {
  padding: 8px;
  border: 1px solid #bdc3c7;
  border-radius: 4px;
  width: 120px;
  font-size: 14px;
}
.input-group select {
  padding: 8px;
  border: 1px solid #bdc3c7;
  border-radius: 4px;
  width: 140px;
  font-size: 14px;
}
.input-group .unit {
  margin-left: 10px;
  color: #7f8c8d;
}
button {
  background-color: #3498db;
  color: white;
  padding: 12px 24px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  margin: 10px 5px;
}
button:hover {
  background-color: #2980b9;
}
button.reset {
  background-color: #95a5a6;
}
.results {
  padding: 20px;
  border-radius: 5px;
  margin-top: 20px;
}
.results.takeoff { background-color: #d5f5e3; }
.results.landing { background-color: #d6eaf8; }
.results.aborted { background-color: #fadbd8; }
.result-item {
  margin: 10px 0;
  padding: 10px;
  background-color: white;
  border-left: 4px solid #2ecc71;
}
.result-item.warning {
  border-left-color: #f39c12;
  background-color: #fef9e7;
}
.result-item.critical {
  border-left-color: #e74c3c;
  background-color: #fdedec;
}
.result-label {
  font-weight: bold;
  color: #2c3e50;
}
.result-value {
  font-size: 18px;
  color: #27ae60;
  font-weight: bold;
}
.formula {
  background-color: #f8f9f9;
  padding: 10px;
  border-left: 3px solid #3498db;
  font-family: 'Courier New', monospace;
  font-size: 13px;
  margin: 10px 0;
}
table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}
table th, table td {
  border: 1px solid #bdc3c7;
  padding: 10px;
  text-align: center;
}
table th {
  background-color: #3498db;
  color: white;
}
table tr:nth-child(even) {
  background-color: #ecf0f1;
}
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.grid-3 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 20px;
}
@media (max-width: 768px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}
.checkbox-group {
  display: flex;
  align-items: center;
  margin: 10px 0;
}
.checkbox-group input[type="checkbox"] {
  margin-right: 10px;
  width: 18px;
  height: 18px;
}
.checkbox-group label {
  font-weight: bold;
  color: #2c3e50;
  cursor: pointer;
}
.wind-calc {
  background-color: #e8f6f3;
  padding: 15px;
  border-radius: 5px;
  margin-top: 10px;
  border: 1px solid #a3e4d7;
}
.wind-result {
  font-weight: bold;
  padding: 10px;
  margin-top: 10px;
  border-radius: 4px;
}
.wind-result.headwind { background-color: #d5f5e3; color: #27ae60; }
.wind-result.tailwind { background-color: #fadbd8; color: #c0392b; }
.tabs {
  display: flex;
  margin-top: 20px;
  border-bottom: 2px solid #bdc3c7;
  margin-bottom: 20px;
}
.tab {
  padding: 12px 24px;
  background-color: #ecf0f1;
  border: 1px solid #bdc3c7;
  border-radius: 5px 5px 0 0;
  cursor: pointer;
  font-weight: bold;
  color: #7f8c8d;
  margin-right: 5px;
}
.tab.active {
  background-color: white;
  color: #2c3e50;
  border-bottom: 2px solid white;
  margin-bottom: -2px;
}
.tab:hover { background-color: #d5dbdb; }
.tab-content { display: none; }
.tab-content.active { display: block; }
.runway-requirement {
  background-color: #d5f5e3;
  border: 2px solid #27ae60;
  padding: 15px;
  border-radius: 5px;
  margin: 20px 0;
}
.runway-requirement.critical {
  background-color: #fadbd8;
  border-color: #c0392b;
}