/**
 * BUTTONS.CSS - Enterprise Button System
 * 
 * Sistema di bottoni professionale per gestionale:
 * - Varianti semantiche chiare
 * - Stati hover/active/focus/disabled
 * - Icon buttons e table actions
 * - Responsive device-based
 * 
 * ⚠️ Estende e migliora i bottoni da components.css
 * ⚠️ Usa esclusivamente variabili CSS da base.css
 */

/* ============================================
   BUTTON BASE (Enhancement)
   ============================================ */

.btn {
  position: relative;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.01em;
}

.btn:active {
  transform: translateY(0);
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  z-index: 1;
}

/* ============================================
   BUTTON VARIANTS (Enhanced)
   ============================================ */

.btn-primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.16);
  transform: translateY(-1px);
}

.btn-primary:active {
  background: var(--color-primary-dark);
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-primary:focus-visible {
  outline-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-secondary {
  background: var(--color-secondary);
  border-color: var(--color-secondary);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-secondary:hover {
  background: var(--color-secondary-hover);
  border-color: var(--color-secondary-hover);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.16);
  transform: translateY(-1px);
}

.btn-secondary:active {
  background: #0f172a;
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-secondary:focus-visible {
  outline-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(17, 24, 39, 0.2);
}

.btn-success {
  background: var(--color-success);
  border-color: var(--color-success);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-success:hover {
  background: var(--color-success-dark);
  border-color: var(--color-success-dark);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.16);
  transform: translateY(-1px);
}

.btn-success:active {
  background: #1e7e34;
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-success:focus-visible {
  outline-color: var(--color-success);
  box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.2);
}

.btn-danger {
  background: var(--color-danger);
  border-color: var(--color-danger);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-danger:hover {
  background: var(--color-danger-dark);
  border-color: var(--color-danger-dark);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.16);
  transform: translateY(-1px);
}

.btn-danger:active {
  background: #bd2130;
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-danger:focus-visible {
  outline-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.25);
}

.btn-warning {
  background: var(--color-warning);
  border-color: var(--color-warning);
  color: #000000;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-warning:hover {
  background: var(--color-warning-dark);
  border-color: var(--color-warning-dark);
  color: #000000;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.16);
  transform: translateY(-1px);
}

.btn-warning:active {
  background: #d39e00;
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-warning:focus-visible {
  outline-color: var(--color-warning);
  box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.25);
}

.btn-info {
  background: var(--color-info);
  border-color: var(--color-info);
  color: #ffffff;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-info:hover {
  background: var(--color-info-dark);
  border-color: var(--color-info-dark);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(15, 23, 42, 0.16);
  transform: translateY(-1px);
}

.btn-info:active {
  background: var(--color-info-dark);
  transform: translateY(0);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.12);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--color-text-muted);
  box-shadow: none;
}

.btn-ghost:hover {
  background: var(--color-bg-soft);
  color: var(--color-text);
  box-shadow: none;
  transform: none;
}

.btn-ghost:active {
  background: var(--color-bg-soft);
  transform: none;
}

.btn-ghost:focus-visible {
  outline-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.btn-outline {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: none;
}

.btn-outline:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(34, 99, 197, 0.2);
  transform: translateY(-1px);
}

.btn-outline:active {
  background: var(--color-primary-dark);
  transform: translateY(0);
}

.btn-outline:focus-visible {
  outline-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

/* ============================================
   BUTTON SIZES (Enhanced)
   ============================================ */

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  gap: var(--space-1);
  min-height: 28px;
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  gap: var(--space-3);
  min-height: 48px;
  font-weight: var(--font-weight-semibold);
}

/* ============================================
   ICON BUTTONS
   ============================================ */

.btn-icon {
  padding: var(--space-2);
  width: auto;
  aspect-ratio: 1;
  min-width: 36px;
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-icon.btn-sm {
  padding: var(--space-1);
  min-width: 28px;
  min-height: 28px;
}

.btn-icon.btn-lg {
  padding: var(--space-3);
  min-width: 48px;
  min-height: 48px;
}

.btn-icon i {
  font-size: 1em;
  line-height: 1;
}

/* ============================================
   TABLE ACTIONS (Enhanced)
   ============================================ */

.table-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  margin-left: var(--space-1);
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-btn);
  transition: background-color var(--transition-fast),
    color var(--transition-fast);
  font-size: var(--font-size-base);
  line-height: 1;
  vertical-align: middle;
}

.table-action:first-child {
  margin-left: 0;
}

.table-action:hover {
  background-color: var(--color-bg-soft);
  color: var(--color-text);
  text-decoration: none;
}

.table-action:active {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.table-action:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* ============================================
   BUTTON GROUPS
   ============================================ */

.btn-group {
  display: inline-flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  align-items: center;
}

.btn-group .btn {
  margin: 0;
}

.btn-group .btn:not(:first-child) {
  margin-left: 0;
}

/* ============================================
   FORM BUTTONS
   ============================================ */

.form-actions .btn {
  min-width: 120px;
}

.form-actions .btn-primary {
  order: 1;
}

.form-actions .btn-secondary,
.form-actions .btn-ghost {
  order: 2;
}

.form-actions .btn-danger {
  order: 3;
  margin-left: auto;
}

/* ============================================
   COMPATIBILITY LAYER
   ============================================ */

/* Alias per classi specifiche template */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-bg-card);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-btn);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.submit-btn {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

.submit-btn:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  background: transparent;
  border: var(--border-width) solid transparent;
  border-radius: var(--radius-btn);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.action-btn:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* Big delete button */
.big-delete-btn {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  min-height: 48px;
}

/* Allegati upload button */
.allegati-upload-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: #ffffff;
  background: var(--color-primary);
  border: var(--border-width) solid var(--color-primary);
  border-radius: var(--radius-btn);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.allegati-upload-btn:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(34, 99, 197, 0.3);
}

/* Button senza classe .btn (compatibilità) */
button.btn-danger:not(.btn) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: #ffffff;
  background: var(--color-danger);
  border: var(--border-width) solid var(--color-danger);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

button.btn-danger:not(.btn):hover {
  background: var(--color-danger-dark);
  border-color: var(--color-danger-dark);
  box-shadow: 0 4px 8px rgba(220, 53, 69, 0.3);
  transform: translateY(-1px);
}

/* ============================================
   RESPONSIVE (Device-based)
   ============================================ */

/* Desktop: Hover evidente, padding maggiore */
body.device-desktop .btn {
  min-height: 36px;
  padding: var(--space-2) var(--space-5);
  font-size: var(--font-size-sm);
}

body.device-desktop .btn:hover {
  transform: translateY(-1px);
}

body.device-desktop .btn-icon {
  min-width: 36px;
  min-height: 36px;
}

body.device-desktop .table-action {
  width: 32px;
  height: 32px;
}

body.device-desktop .table-action:hover {
  transform: scale(1.1);
}

/* Tablet: Bottoni leggermente più alti, hover meno aggressivo */
body.device-tablet .btn {
  min-height: 44px;
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
}

body.device-tablet .btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

body.device-tablet .btn-icon {
  min-width: 44px;
  min-height: 44px;
}

body.device-tablet .table-action {
  width: 36px;
  height: 36px;
}

body.device-tablet .table-action:hover {
  transform: scale(1.05);
}

/* Mobile: Full-width nei form, spacing maggiore, no hover-only */
body.device-mobile .btn {
  min-height: 44px;
  padding: var(--space-3) var(--space-5);
  font-size: var(--font-size-sm);
}

body.device-mobile .form-actions .btn {
  width: 100%;
  min-width: auto;
}

body.device-mobile .btn-group {
  width: 100%;
  flex-direction: column;
}

body.device-mobile .btn-group .btn {
  width: 100%;
}

body.device-mobile .btn-icon {
  min-width: 44px;
  min-height: 44px;
}

body.device-mobile .table-action {
  width: 40px;
  height: 40px;
  font-size: var(--font-size-lg);
}

body.device-mobile .table-action:active {
  transform: scale(0.95);
  background-color: var(--color-primary-light);
}

/* Desktop: Stabile anche con finestra stretta */
body.device-desktop .btn {
  width: auto;
}

body.device-desktop .form-actions .btn {
  width: auto;
  min-width: 120px;
}

body.device-desktop .btn-group {
  flex-direction: row;
}

body.device-desktop .btn-group .btn {
  width: auto;
}

/* ============================================
   BUTTON LOADING STATE
   ============================================ */

.btn.is-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn.is-loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: var(--radius-full);
  animation: spin 0.6s linear infinite;
}

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

.btn-primary.is-loading::after,
.btn-success.is-loading::after,
.btn-danger.is-loading::after {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: #ffffff;
}

/* ============================================
   BUTTON ACCESSIBILITY
   ============================================ */

/* Skip link button */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: #ffffff;
  padding: var(--space-2) var(--space-4);
  text-decoration: none;
  z-index: var(--z-tooltip);
  border-radius: 0 0 var(--radius-md) 0;
}

.skip-link:focus {
  top: 0;
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .btn,
  .table-action {
    transition: none;
  }

  .btn:hover,
  .table-action:hover {
    transform: none;
  }
}