/* Base styles and utilities */
.container {
  padding-left: 1rem;
  padding-right: 1rem;
  margin-left: auto;
  margin-right: auto;
  max-width: 80rem;
}

.calculator-card {
  background-color: white;
  border-radius: 0.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  transition: transform 0.3s, box-shadow 0.3s;
}

.calculator-card:hover {
  transform: translateY(-0.25rem);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.nav-link {
  color: #4a5568;
  transition: color 0.2s;
}

.nav-link:hover {
  color: #1a365d;
}

.nav-link.active {
  color: #1a365d;
  font-weight: 500;
}

.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 0.375rem;
  font-weight: 500;
  transition: background-color 0.2s, color 0.2s;
}

.btn-primary {
  background-color: #1a365d;
  color: white;
}

.btn-primary:hover {
  background-color: #4299e1;
}

.section-title {
  font-size: 1.875rem;
  font-weight: 700;
  color: #1a365d;
  margin-bottom: 1rem;
}

/* Form controls */
.form-group {
  margin-bottom: 1rem;
}

.form-control {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  line-height: 1.5;
  color: #4a5568;
  background-color: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 0.375rem;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
  border-color: #4299e1;
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.15);
  outline: none;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

/* Card component */
.card {
  background: white;
  border-radius: 0.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.card-header {
  padding: 1.5rem 1.5rem 0.5rem;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.card-description {
  color: #718096;
  font-size: 0.875rem;
}

.card-content {
  padding: 1.5rem;
}

.card-footer {
  padding: 1.5rem;
  border-top: 1px solid #e2e8f0;
}

/* Results area */
.result-box {
  background-color: #ebf8ff;
  border-radius: 0.5rem;
  padding: 1rem;
  margin-top: 1.5rem;
}

.result-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a365d;
}