body {
  font-family: 'Arial', sans-serif;
  background: #f7f9fc;
  margin: 0;
  padding: 0;
  color: #222;
}

.site-header {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 25px 0;
  background-color: #ffffff;
  border-bottom: 1px solid #e0e0e0;
}

.logo-link {
  text-decoration: none;
}

.logo-text {
  font-size: 2rem;
  font-weight: 700;
  color: #00bcd4;
}

.calculator-container {
  max-width: 500px;
  margin: 60px auto;
  padding: 30px;
  background-color: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  text-align: center;
}

.calculator-container h1 {
  margin-bottom: 30px;
  font-size: 1.8rem;
  color: #333;
}

.input-group {
  margin-bottom: 20px;
  text-align: left;
}

.input-group label {
  display: block;
  font-weight: bold;
  margin-bottom: 6px;
}

.input-group input[type="date"] {
  width: 100%;
  padding: 10px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 6px;
}

.submit-btn {
  padding: 12px 24px;
  font-size: 1rem;
  background-color: #00bcd4;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.submit-btn:hover {
  background-color: #0097a7;
}

.result-text {
  margin-top: 20px;
  font-size: 1.1rem;
  font-weight: bold;
}

.result-text.error {
  color: red;
}

.footer {
  text-align: center;
  font-size: 0.9rem;
  color: #777;
  padding: 30px 15px;
  border-top: 1px solid #ddd;
  margin-top: 50px;
}

.description {
  font-size: 1rem;
  color: #555;
  margin: -15px 0 30px 0;
  line-height: 1.6;
}


/* RESPONSIVE STYLES */
@media (max-width: 600px) {
  .calculator-container {
    margin: 30px 15px;
    padding: 20px;
  }

  .calculator-container h1 {
    font-size: 1.5rem;
  }

  .description {
    font-size: 0.95rem;
    margin-bottom: 25px;
    text-align: center;
  }

  .input-group input[type="date"] {
    font-size: 1rem;
    padding: 10px;
  }

  .submit-btn {
    width: 100%;
    font-size: 1rem;
    padding: 12px;
  }

  .result-text {
    font-size: 1rem;
  }
}