/**
 * Enhanced Login Page Styles
 * Modern, User-Friendly Design - 2025 Best Practices
 *
 * Features:
 * - Mobile-first responsive design
 * - WCAG 2.1 AA accessibility compliant
 * - Smooth animations and transitions
 * - Real-time validation states
 * - Security indicators and trust badges
 * - Matches signup-enhanced.css styling
 */

/* ================================
   Container & Layout
   ================================ */

.auth-page {
  background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--bg-secondary) 100%);
  min-height: 100vh;
}

.login-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
  min-height: 100vh;
  align-items: start;
}

/* Desktop Layout - Side by Side */
@media (min-width: 1024px) {
  .login-container {
    grid-template-columns: 1fr 380px;
    grid-template-rows: auto 1fr;
    padding: var(--space-12) var(--space-8);
  }

  .login-banner {
    grid-column: 1 / -1;
  }

  .login-card {
    grid-column: 2;
    grid-row: 2;
  }

  .login-benefits {
    grid-column: 1;
    grid-row: 2;
    position: sticky;
    top: var(--space-8);
  }
}

/* ================================
   Security Banner
   ================================ */

.login-banner {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  border-left: 4px solid var(--color-primary);
}

.login-banner__content {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.login-banner__icon {
  flex-shrink: 0;
  color: var(--color-primary);
}

.login-banner__text {
  flex: 1;
}

.login-banner__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
  line-height: var(--line-height-tight);
}

.login-banner__description {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
  line-height: var(--line-height-relaxed);
}

/* ================================
   Main Login Card
   ================================ */

.login-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--space-8);
  width: 100%;
  max-width: 480px;
  margin: 0 auto;
}

/* ================================
   Header Section
   ================================ */

.login-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.login-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  line-height: var(--line-height-tight);
}

.login-subtitle {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin-bottom: 0;
  line-height: var(--line-height-relaxed);
}

/* ================================
   Social Login Section
   ================================ */

.login-social {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.btn-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-6);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-tight);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: var(--touch-target-min);
  width: 100%;
  text-decoration: none;
}

.btn-social:hover {
  background: var(--bg-secondary);
  border-color: var(--border-secondary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-social:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-primary-50);
}

.btn-social:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn-social__icon {
  flex-shrink: 0;
}

.btn-social__text {
  flex: 1;
  text-align: center;
}

/* Specific social button variants */
.btn-social--google:hover {
  border-color: #4285F4;
  background: rgba(66, 133, 244, 0.05);
}

/* ================================
   Divider
   ================================ */

.login-divider {
  position: relative;
  text-align: center;
  margin: var(--space-6) 0;
}

.login-divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border-primary);
  transform: translateY(-50%);
}

.login-divider__text {
  position: relative;
  display: inline-block;
  padding: 0 var(--space-4);
  background: var(--bg-primary);
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

/* ================================
   Form Fields
   ================================ */

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-field {
  position: relative;
}

.form-field__label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  line-height: var(--line-height-tight);
}

.form-field__required {
  color: var(--color-error);
  margin-left: var(--space-1);
}

.form-field__wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.form-field__input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--border-primary);
  border-radius: var(--radius-lg);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  line-height: var(--line-height-tight);
  transition: all var(--transition-fast);
  min-height: var(--touch-target-min);
  appearance: none;
}

.form-field__input::placeholder {
  color: var(--text-tertiary);
  opacity: 0.8;
}

.form-field__input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-50);
}

.form-field__input:disabled {
  background: var(--bg-secondary);
  color: var(--text-tertiary);
  cursor: not-allowed;
  opacity: 0.7;
}

/* Input with password toggle button */
.form-field__wrapper:has(.form-field__toggle) .form-field__input {
  padding-right: var(--space-12);
}

/* Success State */
.form-field.is-valid .form-field__input {
  border-color: var(--color-success);
  padding-right: var(--space-12);
}

.form-field.is-valid .form-field__icon--success {
  display: block;
}

/* Error State */
.form-field.is-invalid .form-field__input {
  border-color: var(--color-error);
}

.form-field.is-invalid .form-field__error {
  display: flex;
}

/* Success Icon */
.form-field__icon--success {
  display: none;
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-success);
  pointer-events: none;
}

/* Password Toggle Button */
.form-field__toggle {
  position: absolute;
  right: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  padding: var(--space-2);
  cursor: pointer;
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
  border-radius: var(--radius-base);
  display: flex;
  align-items: center;
  justify-content: center;
}

.form-field__toggle:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.form-field__toggle:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-primary-50);
}

.form-field__toggle[aria-pressed="true"] .form-field__toggle-icon--show {
  display: none;
}

.form-field__toggle[aria-pressed="true"] .form-field__toggle-icon--hide {
  display: block;
}

/* Field Error Message */
.form-field__error {
  display: none;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-error);
  margin-top: var(--space-2);
  line-height: var(--line-height-relaxed);
  animation: shake 0.3s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

.form-field__error::before {
  content: '';
  display: inline-block;
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%23EF4444'%3E%3Cpath fill-rule='evenodd' d='M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7 4a1 1 0 11-2 0 1 1 0 012 0zm-1-9a1 1 0 00-1 1v4a1 1 0 102 0V6a1 1 0 00-1-1z' clip-rule='evenodd'/%3E%3C/svg%3E");
  background-size: contain;
  flex-shrink: 0;
}

/* ================================
   Remember Me & Forgot Password
   ================================ */

.login-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-4);
  margin-top: var(--space-2);
}

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  user-select: none;
}

.form-checkbox input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.form-checkbox__indicator {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-secondary);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.form-checkbox input:checked + .form-checkbox__indicator {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.form-checkbox input:checked + .form-checkbox__indicator::after {
  content: '';
  width: 5px;
  height: 9px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.form-checkbox input:focus + .form-checkbox__indicator {
  box-shadow: 0 0 0 3px var(--color-primary-50);
}

.form-checkbox__label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: var(--line-height-tight);
}

.link--primary {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.link--primary:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.link--medium {
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

/* ================================
   Security Notice
   ================================ */

.login-notice {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: linear-gradient(135deg, rgba(251, 191, 36, 0.08) 0%, rgba(251, 191, 36, 0.04) 100%);
  border: 1px solid rgba(251, 191, 36, 0.2);
  border-radius: var(--radius-lg);
  margin-top: var(--space-2);
}

.login-notice__icon {
  flex-shrink: 0;
  color: var(--color-warning);
  margin-top: 2px;
}

.login-notice__text {
  flex: 1;
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

/* ================================
   Submit Button
   ================================ */

.login-submit {
  margin-top: var(--space-4);
  position: relative;
}

.login-submit .btn__spinner {
  display: none;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

.login-submit[aria-busy="true"] {
  pointer-events: none;
  opacity: 0.8;
}

.login-submit[aria-busy="true"] .btn__text {
  opacity: 0;
}

.login-submit[aria-busy="true"] .btn__spinner {
  display: block;
}

/* ================================
   Trust Badges
   ================================ */

.login-trust {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
  padding-top: var(--space-6);
  margin-top: var(--space-6);
  border-top: 1px solid var(--border-primary);
}

.login-trust__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--text-tertiary);
  white-space: nowrap;
}

.login-trust__icon {
  flex-shrink: 0;
  color: var(--color-success);
}

/* ================================
   Footer
   ================================ */

.login-footer {
  text-align: center;
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-primary);
}

.login-footer__text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
}

.link--bold {
  font-weight: var(--font-weight-semibold);
}

/* ================================
   Benefits Panel (Desktop Sidebar)
   ================================ */

.login-benefits {
  display: none;
}

@media (min-width: 1024px) {
  .login-benefits {
    display: block;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    box-shadow: var(--shadow-lg);
  }

  .login-benefits__title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    line-height: var(--line-height-tight);
  }

  .login-benefits__description {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    line-height: var(--line-height-relaxed);
  }

  .login-benefits__list {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--space-8) 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
  }

  .login-benefits__item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
  }

  .login-benefits__icon {
    flex-shrink: 0;
    color: var(--color-primary);
  }

  .login-benefits__content {
    flex: 1;
  }

  .login-benefits__item-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-1);
    line-height: var(--line-height-tight);
  }

  .login-benefits__item-text {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin: 0;
    line-height: var(--line-height-relaxed);
  }

  /* Stats Section */
  .login-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    padding-top: var(--space-6);
    border-top: 1px solid var(--border-primary);
  }

  .login-stats__item {
    text-align: center;
  }

  .login-stats__value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--space-1);
    line-height: var(--line-height-tight);
  }

  .login-stats__label {
    font-size: var(--font-size-xs);
    color: var(--text-tertiary);
    line-height: var(--line-height-tight);
  }
}

/* ================================
   Alert Component
   ================================ */

.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.alert__icon {
  flex-shrink: 0;
  margin-top: 2px;
}

.alert--error {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1) 0%, rgba(239, 68, 68, 0.05) 100%);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--color-error);
}

.alert--error .alert__icon {
  color: var(--color-error);
}

.alert--success {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(16, 185, 129, 0.05) 100%);
  border: 1px solid rgba(16, 185, 129, 0.2);
  color: var(--color-success);
}

.alert--success .alert__icon {
  color: var(--color-success);
}

/* ================================
   Responsive Design - Mobile
   ================================ */

@media (max-width: 768px) {
  .login-container {
    padding: var(--space-6) var(--space-4);
    gap: var(--space-6);
  }

  .login-card {
    padding: var(--space-6);
  }

  .login-banner {
    padding: var(--space-4);
  }

  .login-banner__content {
    flex-direction: column;
    text-align: center;
  }

  .login-title {
    font-size: var(--font-size-2xl);
  }

  .login-subtitle {
    font-size: var(--font-size-sm);
  }

  .login-options {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  .login-trust {
    flex-direction: column;
    align-items: center;
  }
}

/* ================================
   Accessibility Enhancements
   ================================ */

/* High Contrast Mode */
@media (prefers-contrast: high) {
  .form-field__input,
  .btn-social {
    border-width: 3px;
  }

  .login-notice,
  .alert {
    border-width: 2px;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus-Visible Support */
.form-field__input:focus-visible,
.btn-social:focus-visible,
.login-submit:focus-visible,
.form-checkbox input:focus-visible + .form-checkbox__indicator {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Screen Reader Only */
.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;
}

/* ================================
   Dark Mode Adjustments
   ================================ */

[data-theme="dark"] {
  .login-banner {
    background: var(--bg-secondary);
  }

  .login-card,
  .login-benefits {
    background: var(--bg-secondary);
  }

  .btn-social {
    background: var(--bg-tertiary);
  }

  .btn-social:hover {
    background: var(--bg-secondary);
    border-color: var(--border-secondary);
  }
}

/* ================================
   Print Styles
   ================================ */

@media print {
  .login-container {
    background: white;
  }

  .login-banner,
  .login-social,
  .login-divider,
  .login-trust,
  .login-benefits,
  .login-notice {
    display: none !important;
  }

  .login-card {
    box-shadow: none;
    border: 1px solid black;
  }
}