/* Additional styles for navigation and responsiveness */
.nav-links {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  padding: 0.5rem;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 8px;
}

.nav-links a {
  color: white;
  text-decoration: none;
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.nav-links a:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Error styles */
.error {
  color: #dc2626;
  font-size: 0.9rem;
  margin-top: 0.3rem;
}

/* Loading indicator */
.loading {
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  border: 3px solid var(--border-color);
  border-radius: 50%;
  border-top-color: var(--primary-color);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  .form-row {
    flex-direction: column;
  }

  .form-row .form-group {
    width: 100%;
  }

  .nav-links {
    gap: 0.5rem;
  }

  .nav-links a {
    padding: 0.2rem 0.6rem;
    font-size: 0.9rem;
  }

  .calculator-card {
    padding: 1rem;
  }
}

/* Print styles */
@media print {
  .nav-links,
  .calculate-btn,
  .footer {
    display: none;
  }

  body {
    padding: 2rem;
  }

  .result {
    display: block !important;
    border: 1px solid #000;
  }
}

/* Theme colors */
[data-theme="dark"] {
  --background-color: #1a1a1a;
  --surface-color: #2d2d2d;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --border-color: #404040;
}

/* Accessibility improvements */
:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}