:root {
  --primary-color: #2E3A59;
  --accent-color: #F5A623;
  --bg-overlay: rgba(0, 0, 0, 0.7);
  --font-main: 'Raleway', sans-serif;
}

.btn, .nav-link {
  font-family: var(--font-main);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #fff;
  padding: 8px 16px;
  border-radius: 4px;
  border: none;
}

.btn-primary:hover,
.nav-link:hover {
  background-color: #1f283e;
  text-decoration: none;
}

.calculator-modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--bg-overlay);
  justify-content: center;
  align-items: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.calculator-container {
  background: #fff;
  max-width: 420px;
  width: 90%;
  padding: 30px;
  border-radius: 8px;
  position: relative;
  box-shadow: 0 10px 25px rgba(0,0,0,0.15);
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from { transform: translateY(-20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.close-modal {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.4rem;
  color: #999;
}

.close-modal:hover {
  color: var(--accent-color);
}

.calculator-container h2 {
  margin-bottom: 20px;
  color: var(--primary-color);
  font-family: var(--font-main);
  text-align: center;
}

.calculator-input {
  margin-bottom: 15px;
}

.calculator-input label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-family: var(--font-main);
}

.calculator-input input,
.calculator-input select {
  width: 100%;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 5px;
  font-family: var(--font-main);
}

.btn-calculate {
  width: 100%;
  background-color: var(--accent-color);
  color: #fff;
  padding: 12px;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
}

.btn-calculate:hover {
  background-color: #d18a1f;
}

.calculator-result {
  margin-top: 20px;
  font-family: var(--font-main);
  font-size: 1.1rem;
  font-weight: bold;
  text-align: center;
  color: var(--primary-color);
}

.calculator-note {
  margin-top: 15px;
  font-size: 0.85rem;
  color: #666;
  text-align: center;
  font-style: italic;
  font-family: var(--font-main);
}