body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: #f4f7f6;
  color: #333;
  margin: 0;
  padding: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  max-width: 600px;
  width: 100%;
  background-color: #fff;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

header {
  text-align: center;
  margin-bottom: 30px;
}

header h1 {
  color: #2c3e50;
  margin-bottom: 10px;
}

.calculator {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.date-inputs {
  display: flex;
  gap: 20px;
  justify-content: space-between;
}

.input-group {
  display: flex;
  flex-direction: column;
  width: 100%;
}

label {
  margin-bottom: 8px;
  font-weight: 500;
  color: #555;
}

input[type="date"],
select {
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 16px;
  width: 100%;
  box-sizing: border-box;
}

input[type="number"] {
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-size: 16px;
  width: 100%;
  box-sizing: border-box;
}

.progressive-vacation {
  display: flex;
  flex-direction: column;
}

button#calculateBtn {
  padding: 15px;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 18px;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

button#calculateBtn:hover {
  background-color: #2980b9;
}

.result-container {
  margin-top: 20px;
  padding: 20px;
  background-color: #eaf4ff;
  border-left: 5px solid #3498db;
  border-radius: 5px;
}

.result-container h2 {
  margin-top: 0;
  color: #2c3e50;
}

.vacation-days {
  font-size: 24px;
  font-weight: bold;
  color: #3498db;
  text-align: center;
}

footer {
  text-align: center;
  margin-top: 30px;
  font-size: 12px;
  color: #777;
}

@media (max-width: 480px) {
  .date-inputs {
    flex-direction: column;
  }
}