/* ==============================================================================
   TRACCIATO STUDIO OS - STILI SCHERMATA DI LOGIN (OPERAZIONE 2.3)
   Design Swiss Minimal, Precisione Tipografica e Contrasti Calibrati
   ============================================================================== */

.login-viewport {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: radial-gradient(circle at 50% 30%, var(--surface-2) 0%, var(--bg-primary) 70%);
  position: relative;
  overflow: hidden;
}

/* Griglia millimetrica tecnica di sfondo (sottilissima) */
.login-viewport::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

[data-theme="light"] .login-viewport {
  background: radial-gradient(circle at 50% 30%, #FFFFFF 0%, #F1F5F9 70%);
}

[data-theme="light"] .login-viewport::before {
  background-image: 
    linear-gradient(to right, rgba(0, 0, 0, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
}

/* Card Centrale di Accesso */
.login-card {
  width: 100%;
  max-width: 440px;
  background: var(--surface-1);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 48px -12px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.04);
  padding: 2.5rem 2.25rem;
  position: relative;
  z-index: 10;
  backdrop-filter: blur(12px);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

[data-theme="light"] .login-card {
  background: #FFFFFF;
  border-color: #E2E8F0;
  box-shadow: 0 20px 35px -10px rgba(15, 23, 42, 0.10), 0 1px 3px rgba(0, 0, 0, 0.05);
}

/* Header & Brand Icon */
.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-brand-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  color: #10B981;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.12);
}

.login-brand-icon .reticle-svg {
  width: 34px;
  height: 34px;
}

.login-badge-row {
  display: flex;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.login-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  margin-bottom: 0.4rem;
}

.login-subtitle {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.45;
}

/* Banner Alert Errori */
.login-alert {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.28);
  border-left: 3px solid #EF4444;
  border-radius: var(--radius-sm);
  color: #F87171;
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1.4;
}

[data-theme="light"] .login-alert {
  background: #FEF2F2;
  border-color: #FCA5A5;
  border-left-color: #EF4444;
  color: #B91C1C;
}

/* Modulo Form */
.login-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.form-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 0.85rem;
  width: 17px;
  height: 17px;
  color: var(--text-dim);
  pointer-events: none;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.6rem;
  background: var(--surface-2);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: #3B82F6;
  background: var(--surface-3);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

[data-theme="light"] .form-input {
  background: #F8FAFC;
  border-color: #CBD5E1;
  color: #0F172A;
}

[data-theme="light"] .form-input:focus {
  background: #FFFFFF;
  border-color: #2563EB;
}

/* Pulsante Toggle Password */
.btn-toggle-pwd {
  position: absolute;
  right: 0.75rem;
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: color var(--transition-fast);
}

.btn-toggle-pwd:hover {
  color: var(--text-primary);
}

.btn-toggle-pwd svg {
  width: 17px;
  height: 17px;
}

/* Spunta Ricordami a 30 Giorni */
.login-remember-row {
  margin-top: 0.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.remember-checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  cursor: pointer;
  user-select: none;
}

.custom-chk-box {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1px solid var(--border-strong);
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.custom-chk-box.checked {
  background: #3B82F6;
  border-color: #3B82F6;
  box-shadow: 0 0 8px rgba(59, 130, 246, 0.35);
}

.chk-check-icon {
  width: 12px;
  height: 12px;
  stroke: #FFFFFF;
  opacity: 0;
  transform: scale(0.6);
  transition: all var(--transition-fast);
}

.custom-chk-box.checked .chk-check-icon {
  opacity: 1;
  transform: scale(1);
}

.remember-text {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  font-weight: 500;
}

.remember-help-text {
  font-size: 0.725rem;
  color: var(--text-dim);
  margin-left: 1.8rem;
  line-height: 1.35;
}

/* Pulsante Submit Login */
.btn-login-submit {
  width: 100%;
  margin-top: 0.75rem;
  padding: 0.85rem 1.25rem;
  background: #3B82F6;
  border: 1px solid #2563EB;
  color: #FFFFFF;
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.3);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  transition: all var(--transition-fast);
}

.btn-login-submit:hover:not(:disabled) {
  background: #2563EB;
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
  transform: translateY(-1px);
}

.btn-login-submit:active:not(:disabled) {
  transform: translateY(0);
}

.btn-login-submit:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-login-submit.login-success {
  background: #10B981 !important;
  border-color: #059669 !important;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.4) !important;
}

.btn-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #FFFFFF;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* Footer Tecnico */
.login-footer {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-subtle);
}

/* Animazione Shake Errore */
.shake-animation {
  animation: shake 0.4s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
}

@keyframes shake {
  10%, 90% { transform: translate3d(-1px, 0, 0); }
  20%, 80% { transform: translate3d(2px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
  40%, 60% { transform: translate3d(4px, 0, 0); }
}

/* Utility per screen reader */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}