/* =============================================================================
   ADMIN LOGIN PAGE
   Design System Valastro - Minimalista B/N
   ============================================================================= */

.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  background: var(--color-black);
  position: relative;
  overflow: hidden;
}

/* Subtle animated background pattern */
.login-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 20% 30%, var(--color-white-05) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, var(--color-white-02) 0%, transparent 40%);
  pointer-events: none;
}

.login-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 420px;
  background: var(--color-white-02);
  border: 1px solid var(--color-white-08);
  padding: var(--space-xl);
  transition: all 0.3s ease;
}

.login-card:hover {
  background: var(--color-white-04);
  border-color: var(--color-white-15);
}

/* Header */
.login-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.login-header h1 {
  font-family: var(--font-serif);
  font-size: var(--fs-h2);
  color: var(--color-white);
  margin-bottom: var(--space-xs);
  letter-spacing: -0.02em;
}

.login-header p {
  font-size: var(--fs-body-sm);
  color: var(--color-white-60);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

/* Error Message */
.error-message {
  background: var(--color-white-05);
  border: 1px solid rgba(220, 53, 69, 0.3);
  padding: var(--space-sm) var(--space-md);
  margin-bottom: var(--space-md);
  color: #ef4444;
  font-size: var(--fs-body-sm);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  animation: shake 0.5s ease;
}

.error-message::before {
  content: '⚠';
  font-size: 1.2rem;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}

/* Form */
.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-group label {
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  color: var(--color-white-80);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.form-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-white-05);
  border: 1px solid var(--color-white-10);
  color: var(--color-white);
  font-size: var(--fs-body);
  font-family: var(--font-sans);
  transition: all 0.3s ease;
}

.form-input:focus {
  outline: none;
  background: var(--color-white-08);
  border-color: var(--color-white);
}

.form-input::placeholder {
  color: var(--color-white-40);
}

.btn-full {
  width: 100%;
  margin-top: var(--space-xs);
  padding: var(--space-sm);
  font-weight: var(--fw-medium);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

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

.btn-full:disabled:hover {
  transform: none;
  background: var(--color-white);
  color: var(--color-black);
}

/* Divider */
.divider {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin: var(--space-lg) 0;
  color: var(--color-white-40);
  font-size: var(--fs-body-sm);
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-white-10);
}

/* Google Sign In Button */
.btn-google {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  color: var(--color-white);
  border: 1px solid var(--color-white-30);
  font-size: var(--fs-body-sm);
  font-weight: var(--fw-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-google:hover {
  background: var(--color-white);
  color: var(--color-black);
  border-color: var(--color-white);
}

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

.btn-google svg {
  flex-shrink: 0;
}

/* Footer */
.login-footer {
  margin-top: var(--space-xl);
  text-align: center;
}

.login-footer a {
  color: var(--color-white-60);
  text-decoration: none;
  font-size: var(--fs-body-sm);
  transition: color 0.3s ease;
}

.login-footer a:hover {
  color: var(--color-white);
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-white);
  color: var(--color-black);
  border: 1px solid var(--color-white);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  transform: translateX(400px);
  transition: transform 0.3s ease;
  z-index: 10000;
  max-width: 350px;
  font-size: var(--fs-body-sm);
}

.toast.show {
  transform: translateX(0);
}

.toast.error {
  background: var(--color-black);
  color: #ef4444;
  border-color: #ef4444;
}

.toast.success {
  background: var(--color-black);
  color: #22c55e;
  border-color: #22c55e;
}

/* Loading State */
.btn-full.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--color-white-30);
  border-top-color: var(--color-black);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn-full.loading span {
  opacity: 0;
}

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

/* ============================================
   RESPONSIVE & MOBILE OPTIMIZATIONS
   ============================================ */

/* Tablet: 1024px e sotto */
@media (max-width: 1024px) {
  .login-card {
    max-width: 480px;
  }
  
  .login-header h1 {
    font-size: clamp(2.25rem, 4vw, 3rem);
  }
}

/* Mobile: 768px e sotto */
@media (max-width: 768px) {
  .login-container {
    padding: var(--space-md);
    align-items: flex-start;
    padding-top: 10vh;
  }
  
  .login-container::before {
    background: 
      radial-gradient(circle at 30% 20%, var(--color-white-05) 0%, transparent 50%),
      radial-gradient(circle at 70% 80%, var(--color-white-02) 0%, transparent 50%);
  }

  .login-card {
    padding: var(--space-lg) var(--space-md);
    max-width: 100%;
  }
  
  .login-card:hover {
    background: var(--color-white-02);
    border-color: var(--color-white-08);
  }

  .login-header {
    margin-bottom: var(--space-lg);
  }

  .login-header h1 {
    font-size: clamp(2rem, 5vw, 2.5rem);
    margin-bottom: var(--space-sm);
  }
  
  .login-header p {
    font-size: var(--fs-caption);
    letter-spacing: 0.15em;
  }
  
  .error-message {
    padding: var(--space-sm);
    font-size: var(--fs-caption);
  }
  
  .login-form {
    gap: var(--space-sm);
  }
  
  .form-group label {
    font-size: var(--fs-caption);
  }
  
  .form-input {
    padding: var(--space-sm);
    font-size: 16px; /* Previene zoom automatico su iOS */
  }
  
  .btn-full {
    padding: var(--space-sm);
    font-size: var(--fs-body-sm);
  }
  
  .divider {
    margin: var(--space-md) 0;
    font-size: var(--fs-caption);
  }
  
  .btn-google {
    padding: var(--space-sm);
    font-size: var(--fs-caption);
    gap: var(--space-xs);
  }
  
  .login-footer {
    margin-top: var(--space-lg);
  }
  
  .login-footer a {
    font-size: var(--fs-caption);
  }

  .toast {
    bottom: var(--space-sm);
    right: var(--space-sm);
    left: var(--space-sm);
    max-width: none;
    font-size: var(--fs-caption);
  }
}

/* Small Mobile: 480px e sotto */
@media (max-width: 480px) {
  .login-container {
    padding: var(--space-sm);
    padding-top: 8vh;
  }
  
  .login-card {
    padding: var(--space-md) var(--space-sm);
  }
  
  .login-header h1 {
    font-size: clamp(1.75rem, 6vw, 2rem);
  }
  
  .login-header p {
    font-size: 0.65rem;
  }
  
  .error-message {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.75rem;
  }
  
  .form-group {
    gap: 0.35rem;
  }
  
  .form-input {
    padding: var(--space-xs) var(--space-sm);
    font-size: 16px;
  }
  
  .btn-full {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.85rem;
  }
  
  .divider {
    margin: var(--space-sm) 0;
  }
  
  .btn-google {
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.75rem;
  }
  
  .login-footer {
    margin-top: var(--space-md);
  }
  
  .toast {
    bottom: var(--space-xs);
    right: var(--space-xs);
    left: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
  }
}

/* Landscape mobile */
@media (max-width: 768px) and (orientation: landscape) {
  .login-container {
    padding-top: 5vh;
    align-items: center;
  }
  
  .login-card {
    max-width: 500px;
  }
  
  .login-header {
    margin-bottom: var(--space-md);
  }
  
  .login-form {
    gap: var(--space-sm);
  }
  
  .divider {
    margin: var(--space-sm) 0;
  }
  
  .login-footer {
    margin-top: var(--space-md);
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  .btn-full,
  .btn-google {
    min-height: 44px; /* Standard iOS touch target */
    -webkit-tap-highlight-color: rgba(255, 255, 255, 0.1);
  }
  
  /* Disabilita hover effects su touch devices */
  .login-card:hover {
    background: var(--color-white-02);
    border-color: var(--color-white-08);
  }
  
  .btn-google:hover {
    background: transparent;
    color: var(--color-white);
    border-color: var(--color-white-30);
  }
  
  .login-footer a:hover {
    color: var(--color-white-60);
  }
  
  /* Active states per feedback tattile */
  .btn-full:active {
    transform: scale(0.98);
    background: var(--color-white-90);
  }
  
  .btn-google:active {
    background: var(--color-white-05);
  }
  
  .form-input:focus {
    background: var(--color-white-08);
  }
}

/* Safe area per dispositivi con notch */
@supports (padding: max(0px)) {
  .login-container {
    padding-top: max(var(--space-lg), env(safe-area-inset-top));
    padding-bottom: max(var(--space-lg), env(safe-area-inset-bottom));
  }
  
  @media (max-width: 768px) {
    .login-container {
      padding-top: max(10vh, env(safe-area-inset-top));
      padding-bottom: max(var(--space-md), env(safe-area-inset-bottom));
    }
  }
  
  @media (max-width: 480px) {
    .login-container {
      padding-top: max(8vh, env(safe-area-inset-top));
    }
  }
  
  .toast {
    bottom: max(var(--space-lg), env(safe-area-inset-bottom));
    right: max(var(--space-lg), env(safe-area-inset-right));
  }
  
  @media (max-width: 768px) {
    .toast {
      bottom: max(var(--space-sm), env(safe-area-inset-bottom));
      left: max(var(--space-sm), env(safe-area-inset-left));
      right: max(var(--space-sm), env(safe-area-inset-right));
    }
  }
}

/* iOS specific fixes */
@supports (-webkit-touch-callout: none) {
  /* Fix per autofill background su iOS */
  .form-input:-webkit-autofill {
    -webkit-text-fill-color: var(--color-white);
    -webkit-box-shadow: 0 0 0 1000px var(--color-white-05) inset;
    transition: background-color 5000s ease-in-out 0s;
  }
  
  /* Previene bounce scrolling */
  .login-container {
    overscroll-behavior-y: none;
  }
}