/* 
 * Forms CSS for Structural Engineering Tools
 * Input fields, buttons, labels, and form layouts
 */

/* Form layouts */
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .form-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.form-section {
  background-color: var(--bg-tertiary);
  border-radius: var(--border-radius-sm);
  padding: 1.5rem;
}

.form-section h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

/* Input field styling */
.input-group {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.input-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: right;
  min-width: 120px;
  flex-shrink: 0;
}

.input-field {
  flex: 1;
  padding: 0.5rem 0.75rem;
  background-color: var(--bg-quaternary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  transition: var(--transition);
}

.input-field:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.input-field:hover {
  border-color: var(--text-muted);
}

.input-field::placeholder {
  color: var(--text-muted);
}

/* Specialized input variations */
.input-field-large {
  padding: 0.75rem 1rem;
  font-size: 1rem;
}

.input-field-small {
  padding: 0.375rem 0.5rem;
  font-size: 0.75rem;
}

/* Button styling */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  user-select: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Button variants */
.btn-primary {
  background-color: var(--accent-blue);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--accent-blue-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-quaternary);
  border-color: var(--text-muted);
}

.btn-success {
  background-color: var(--accent-green);
  color: white;
}

.btn-success:hover:not(:disabled) {
  background-color: var(--accent-green-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-danger {
  background-color: var(--accent-red);
  color: white;
}

.btn-danger:hover:not(:disabled) {
  background-color: var(--accent-red-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

/* Button sizes */
.btn-large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

.btn-small {
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
}

.btn-full-width {
  width: 100%;
}

/* Form validation styles */
.input-field.error {
  border-color: var(--accent-red);
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.2);
}

.input-field.success {
  border-color: var(--accent-green);
  box-shadow: 0 0 0 2px rgba(22, 163, 74, 0.2);
}

.error-message {
  color: var(--accent-red);
  font-size: 0.75rem;
  margin-top: 0.25rem;
}

.success-message {
  color: var(--accent-green);
  font-size: 0.75rem;
  margin-top: 0.25rem;
}

/* Checkbox and radio styling */
.checkbox-group,
.radio-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.checkbox,
.radio {
  width: 1rem;
  height: 1rem;
  background-color: var(--bg-quaternary);
  border: 1px solid var(--border-color);
  border-radius: 0.25rem;
  cursor: pointer;
}

.radio {
  border-radius: 50%;
}

.checkbox:checked,
.radio:checked {
  background-color: var(--accent-blue);
  border-color: var(--accent-blue);
}

/* Select dropdown styling */
.select-field {
  flex: 1;
  padding: 0.5rem 0.75rem;
  background-color: var(--bg-quaternary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
}

.select-field:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

/* Fieldset styling */
.fieldset {
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 1rem;
  margin-bottom: 1.5rem;
}

.fieldset legend {
  color: var(--text-primary);
  font-weight: 600;
  padding: 0 0.5rem;
}

/* Responsive form adjustments */
@media (max-width: 767px) {
  .input-group {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }
  
  .input-label {
    text-align: left;
    min-width: auto;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
}

/* Focus visible for better accessibility */
.btn:focus-visible,
.input-field:focus-visible,
.select-field:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}