/* Authentication UI Styles for Japanese Grammar Tracker */

/* Theme variables and base styles */
:root {
  --color-background: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-primary: #3b82f6;
  --color-primary-hover: #2563eb;
  --color-primary-rgb: 59, 130, 246;
  --color-success: #10b981;
  --color-success-rgb: 16, 185, 129;
  --color-error: #ef4444;
  --color-error-rgb: 239, 68, 68;
  --color-warning: #f59e0b;
  --color-border: #e2e8f0;
  --color-card-border: #e2e8f0;
  --color-bg-1: #f1f5f9;
  --color-secondary: #f1f5f9;
  --color-secondary-hover: #e2e8f0;
  --color-hover: #f1f5f9;
  --color-zen-gray-50: #f8fafc;
  --color-zen-gray-100: #f1f5f9;
  --focus-ring: 0 0 0 3px rgba(59, 130, 246, 0.25);
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  /* Enhanced animations */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Japanese-inspired accent colors */
  --color-sakura: #ffb7c5;
  --color-indigo: #4f46e5;
  --color-bamboo: #84cc16;
  --color-zen: #1e293b;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--color-background);
  color: var(--color-text);
  font-family: "Inter var", Inter, "Noto Sans JP", ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.5;
  letter-spacing: 0.2px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Dark theme (respects system preference) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #0a0f1c;
    --color-surface: #101827;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-border: #1e293b;
    --color-card-border: #334155;
    --color-secondary: #0f172a;
    --color-secondary-hover: #1e293b;
    --color-hover: #1e293b;
    --color-zen-gray-50: #0f172a;
    --color-zen-gray-100: #1e293b;
    --color-bg-1: #1e293b;
    
    /* Enhanced dark mode specific colors */
    --color-primary-dark: #60a5fa;
    --color-primary-hover-dark: #3b82f6;
    --color-surface-elevated: #1e293b;
    --color-surface-glass: rgba(30, 41, 59, 0.8);
    --color-backdrop: rgba(0, 0, 0, 0.6);
    --shadow-dark: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
    --shadow-dark-lg: 0 35px 60px -12px rgba(0, 0, 0, 0.9);
    --glow-primary: 0 0 20px rgba(96, 165, 250, 0.3);
    --glow-success: 0 0 20px rgba(34, 197, 94, 0.3);
  }
}

/* Enhanced header with better visual hierarchy */
.header {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--color-border);
  z-index: 10;
  box-shadow: var(--shadow-sm);
  backdrop-filter: saturate(180%) blur(12px);
  transition: all var(--transition-normal);
}

@media (prefers-color-scheme: dark) {
  .header {
    background: rgba(15, 23, 42, 0.85);
    border-bottom: 1px solid var(--color-card-border);
    box-shadow: var(--shadow-dark);
    backdrop-filter: saturate(180%) blur(20px);
  }
}

/* Header brand with enhanced styling */
.header__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  color: var(--color-text);
  transition: transform var(--transition-fast);
}

.header__brand:hover {
  transform: translateY(-1px);
}

.brand-logo {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--color-primary), var(--color-indigo));
  color: white;
  border: none;
  font-weight: 700;
  font-size: 1.2rem;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.brand-logo::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.6s ease;
}

.brand-logo:hover::before {
  left: 100%;
}

.brand-text { 
  letter-spacing: 0.2px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-indigo));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Enhanced landing layout with better visual appeal */
.landing {
  min-height: calc(100vh - 64px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  background:
    radial-gradient(800px 300px at 50% 0%, rgba(var(--color-primary-rgb), 0.08), transparent 70%),
    radial-gradient(600px 300px at 0% 20%, rgba(16, 185, 129, 0.06), transparent 70%),
    radial-gradient(600px 300px at 100% 80%, rgba(79, 70, 229, 0.06), transparent 70%),
    var(--color-background);
  position: relative;
  overflow: hidden;
}

@media (prefers-color-scheme: dark) {
  .landing {
    background:
      radial-gradient(800px 400px at 50% 0%, rgba(96, 165, 250, 0.12), transparent 70%),
      radial-gradient(600px 300px at 0% 20%, rgba(34, 197, 94, 0.08), transparent 70%),
      radial-gradient(600px 300px at 100% 80%, rgba(139, 92, 246, 0.08), transparent 70%),
      radial-gradient(circle at 30% 40%, rgba(96, 165, 250, 0.03), transparent 50%),
      radial-gradient(circle at 70% 60%, rgba(79, 70, 229, 0.03), transparent 50%),
      var(--color-background);
  }
  
  .landing::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
      linear-gradient(135deg, transparent 0%, rgba(96, 165, 250, 0.02) 25%, transparent 50%, rgba(139, 92, 246, 0.02) 75%, transparent 100%),
      repeating-linear-gradient(45deg, transparent, transparent 35px, rgba(96, 165, 250, 0.01) 35px, rgba(96, 165, 250, 0.01) 70px);
    pointer-events: none;
    z-index: 0;
  }
}

/* Floating particles animation */
.landing::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: 
    radial-gradient(2px 2px at 20px 30px, rgba(var(--color-primary-rgb), 0.3), transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(var(--color-success-rgb), 0.3), transparent),
    radial-gradient(1px 1px at 90px 40px, rgba(var(--color-primary-rgb), 0.2), transparent),
    radial-gradient(1px 1px at 130px 80px, rgba(var(--color-success-rgb), 0.2), transparent);
  background-repeat: repeat;
  background-size: 200px 100px;
  animation: float 20s linear infinite;
  opacity: 0.6;
}

@media (prefers-color-scheme: dark) {
  .landing::before {
    background-image: 
      radial-gradient(2px 2px at 20px 30px, rgba(96, 165, 250, 0.4), transparent),
      radial-gradient(2px 2px at 40px 70px, rgba(34, 197, 94, 0.4), transparent),
      radial-gradient(1px 1px at 90px 40px, rgba(139, 92, 246, 0.3), transparent),
      radial-gradient(1px 1px at 130px 80px, rgba(34, 197, 94, 0.3), transparent),
      radial-gradient(1px 1px at 160px 20px, rgba(96, 165, 250, 0.2), transparent);
    opacity: 0.8;
    animation: float 25s linear infinite;
  }
}

@keyframes float {
  0% { transform: translateY(0px); }
  100% { transform: translateY(-100px); }
}

.card {
  background: linear-gradient(180deg, rgba(255,255,255,0.85), rgba(255,255,255,0.95));
  border: 1px solid var(--color-border);
  border-radius: 24px;
  padding: 48px;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-lg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  position: relative;
  z-index: 1;
  transition: all var(--transition-normal);
}

@media (prefers-color-scheme: dark) {
  .card {
    background: linear-gradient(180deg, var(--color-surface-glass), rgba(16, 24, 39, 0.95));
    border: 1px solid var(--color-card-border);
    box-shadow: var(--shadow-dark-lg), var(--glow-primary);
    backdrop-filter: blur(20px);
  }
  
  .card:hover {
    box-shadow: var(--shadow-dark-lg), var(--glow-primary), 0 0 40px rgba(96, 165, 250, 0.2);
  }
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 10px 10px -5px rgb(0 0 0 / 0.04);
}

.landing-card { text-align: center; }

.landing-title {
  margin: 0 0 1rem 0;
  font-size: clamp(1.75rem, 1.25rem + 2vw, 2.25rem);
  color: var(--color-text);
  font-weight: 700;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, var(--color-text), var(--color-primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.landing-subtitle {
  margin: 0 0 2rem 0;
  color: var(--color-text-secondary);
  font-size: 1.125rem;
  line-height: 1.6;
}

.landing-actions { 
  display: flex; 
  align-items: center; 
  justify-content: center; 
  gap: 0.75rem; 
}

.landing-hint {
  margin: 2rem 0 0 0;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  opacity: 0.8;
}

/* Enhanced profile display styles */
.landing-profile {
  margin-bottom: 1.5rem;
}

.profile-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  text-align: left;
}

.profile-avatar {
  width: 4rem;
  height: 4rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-indigo));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 600;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.profile-avatar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.2) 50%, transparent 70%);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.profile-avatar:hover::before {
  transform: translateX(100%);
}

.profile-details h2 {
  margin: 0 0 0.25rem 0;
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
}

.profile-email {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.landing-actions .auth-button + .auth-button {
  margin-left: 0.75rem;
}

@media (max-width: 480px) {
  .landing-actions .auth-button + .auth-button {
    margin-left: 0;
    margin-top: 0.75rem;
  }
  
  .landing-actions {
    flex-direction: column;
  }
  
  .profile-info {
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
  }
}

/* Enhanced Auth Modal Overlay */
.auth-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

@media (prefers-color-scheme: dark) {
  .auth-overlay {
    background: var(--color-backdrop);
    backdrop-filter: blur(12px);
  }
}

.auth-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* Enhanced Auth Modal */
.auth-modal {
  background: var(--color-surface);
  border-radius: 20px;
  padding: 2.5rem;
  width: 90%;
  max-width: 440px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: translateY(8px) scale(0.98);
  opacity: 0;
  transition: all var(--transition-slow);
  border: 1px solid var(--color-border);
  position: relative;
}

@media (prefers-color-scheme: dark) {
  .auth-modal {
    background: linear-gradient(180deg, var(--color-surface), var(--color-surface-elevated));
    border: 1px solid var(--color-card-border);
    box-shadow: var(--shadow-dark-lg), var(--glow-primary);
    backdrop-filter: blur(20px);
  }
  
  .auth-modal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, 
      rgba(96, 165, 250, 0.03) 0%, 
      transparent 25%, 
      transparent 75%, 
      rgba(79, 70, 229, 0.03) 100%);
    border-radius: 20px;
    pointer-events: none;
    z-index: -1;
  }
}

.auth-overlay.active .auth-modal {
  transform: none;
  opacity: 1;
}

/* Enhanced Auth Header */
.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-brand {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.auth-brand__icon {
  font-size: 1.8rem;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,0.15));
  animation: pulse-glow 2s ease-in-out infinite alternate;
}

@keyframes pulse-glow {
  from { filter: drop-shadow(0 4px 8px rgba(0,0,0,0.15)); }
  to { filter: drop-shadow(0 4px 12px rgba(var(--color-primary-rgb), 0.3)); }
}

.auth-brand__text h2 {
  margin: 0 0 0.25rem 0;
}

.auth-header h2 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  font-size: 1.6rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary), var(--color-indigo));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-header p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Enhanced Auth Form */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.form-group input {
  padding: 0.875rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: 12px;
  font-size: 1rem;
  background: var(--color-background);
  color: var(--color-text);
  transition: all var(--transition-normal);
  font-weight: 500;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(var(--color-primary-rgb), 0.1);
  transform: translateY(-1px);
}

.form-group input.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 4px rgba(var(--color-error-rgb), 0.1);
}

.form-group input:valid {
  border-color: var(--color-success);
}

@media (prefers-color-scheme: dark) {
  .form-group input {
    background: var(--color-surface-elevated);
    border-color: var(--color-card-border);
    color: var(--color-text);
  }
  
  .form-group input:focus {
    border-color: var(--color-primary-dark);
    box-shadow: 0 0 0 4px rgba(96, 165, 250, 0.15), var(--glow-primary);
    background: var(--color-surface);
  }
  
  .form-group input:valid {
    border-color: var(--color-success);
    box-shadow: 0 0 0 2px rgba(34, 197, 94, 0.1);
  }
  
  .form-group input.error {
    border-color: var(--color-error);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.15);
  }
}

/* Enhanced Input with icons */
.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-wrapper input {
  width: 100%;
  padding-left: 2.5rem;
}

.input-icon {
  position: absolute;
  left: 0.75rem;
  font-size: 1.1rem;
  opacity: 0.7;
  transition: all var(--transition-fast);
}

.input-wrapper:focus-within .input-icon {
  opacity: 1;
  transform: scale(1.1);
}

.input-wrapper--password input {
  padding-right: 2.5rem;
}

.password-toggle {
  position: absolute;
  right: 0.5rem;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.password-toggle::before {
  content: '👁️';
  display: inline-block;
  transition: all var(--transition-fast);
}

.password-toggle.visible::before {
  content: '🙈';
}

.password-toggle:hover {
  background: var(--color-hover);
  border-color: var(--color-primary);
  transform: scale(1.05);
}

@media (prefers-color-scheme: dark) {
  .password-toggle {
    border-color: var(--color-card-border);
    background: rgba(30, 41, 59, 0.5);
  }
  
  .password-toggle:hover {
    background: var(--color-secondary-hover);
    border-color: var(--color-primary-dark);
    box-shadow: 0 4px 12px rgba(96, 165, 250, 0.2);
  }
}

/* Enhanced Error Message */
.error-message {
  background: rgba(var(--color-error-rgb), 0.08);
  color: var(--color-error);
  padding: 1rem;
  border-radius: 12px;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  border: 1px solid rgba(var(--color-error-rgb), 0.2);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: slideIn var(--transition-normal);
}

.error-message::before {
  content: '⚠️';
  font-size: 1.1rem;
}

/* Enhanced Success Message */
.success-message {
  background: rgba(var(--color-success-rgb), 0.08);
  color: var(--color-success);
  padding: 1rem;
  border-radius: 12px;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  border: 1px solid rgba(var(--color-success-rgb), 0.2);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: slideIn var(--transition-normal);
}

.success-message::before {
  content: '✅';
  font-size: 1.1rem;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Enhanced Auth Buttons */
.auth-button {
  padding: 1rem 2rem;
  border: none;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 56px;
  letter-spacing: 0.025em;
  position: relative;
  overflow: hidden;
}

.auth-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.6s ease;
}

.auth-button:hover::before {
  left: 100%;
}

.auth-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.auth-button-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-indigo));
  color: white;
  box-shadow: 0 8px 20px rgba(var(--color-primary-rgb), 0.3);
}

.auth-button-primary:hover:not(:disabled) { 
  filter: brightness(1.05); 
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(var(--color-primary-rgb), 0.4);
}

@media (prefers-color-scheme: dark) {
  .auth-button-primary {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-indigo));
    box-shadow: 0 8px 20px rgba(96, 165, 250, 0.4), var(--glow-primary);
  }
  
  .auth-button-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary-hover-dark), #6366f1);
    box-shadow: 0 12px 32px rgba(96, 165, 250, 0.5), var(--glow-primary);
    filter: brightness(1.1);
  }
}

.auth-button-google {
  background: var(--color-surface);
  color: var(--color-text);
  border: 2px solid var(--color-card-border);
  border-radius: 14px;
  display: block;
  width: 100%;
  margin: 0;
  transition: all var(--transition-normal);
}

.auth-button-google:hover:not(:disabled) { 
  background: var(--color-bg-1); 
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.auth-button-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  transition: all var(--transition-normal);
}

.auth-button-secondary:hover:not(:disabled) {
  background: var(--color-primary);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

@media (prefers-color-scheme: dark) {
  .auth-button-google {
    background: var(--color-surface-elevated);
    border-color: var(--color-card-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  }
  
  .auth-button-google:hover:not(:disabled) {
    background: var(--color-secondary-hover);
    border-color: var(--color-primary-dark);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4), var(--glow-primary);
  }
  
  .auth-button-secondary {
    color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    background: rgba(96, 165, 250, 0.05);
  }
  
  .auth-button-secondary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    color: var(--color-surface);
    box-shadow: 0 8px 20px rgba(96, 165, 250, 0.3), var(--glow-primary);
  }
}

/* Enhanced Focus states */
:where(button,[role="button"],a,input,select,textarea).auth-button:focus-visible,
:where(button,[role="button"],a,input,select,textarea):focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Enhanced Loading Spinner */
.loading-spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top: 3px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Enhanced Divider */
.auth-divider {
  display: flex;
  align-items: center;
  margin: 2rem 0;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
}

.auth-divider::before {
  margin-right: 1rem;
}

.auth-divider::after {
  margin-left: 1rem;
}

/* Enhanced Auth Toggle */
.auth-toggle {
  text-align: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.auth-toggle p {
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
}

.auth-toggle button {
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: underline;
  transition: all var(--transition-fast);
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
}

.auth-toggle button:hover {
  color: var(--color-primary-hover);
  background: rgba(var(--color-primary-rgb), 0.1);
  text-decoration: none;
}

/* Enhanced Close Button */
.auth-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text-secondary);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.auth-close:hover {
  background: var(--color-hover);
  color: var(--color-text);
  transform: scale(1.1);
}

/* Enhanced User Menu */
.user-menu {
  position: relative;
  display: inline-block;
}

.user-menu-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  min-height: 40px;
  background: transparent;
  border: 1px solid var(--color-card-border);
  border-radius: 9999px;
  cursor: pointer;
  transition: all var(--transition-normal);
  color: var(--color-text);
  font-size: 0.9rem;
  box-shadow: none;
}

.user-menu-button:hover {
  background: var(--color-secondary);
  border-color: var(--color-primary);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.user-menu-button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.user-menu-button.active {
  background: var(--color-secondary-hover);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-indigo));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--color-card-border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.user-menu-button:hover .user-avatar {
  transform: scale(1.1);
}

.user-caret {
  margin-left: 0.125rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.user-menu-button:hover .user-caret { 
  color: var(--color-text); 
  transform: translateY(1px);
}

.user-menu-button.active .user-caret { 
  transform: rotate(180deg); 
}

.user-menu-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  min-width: 220px;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition-normal);
  margin-top: 0.5rem;
}

@media (prefers-color-scheme: dark) {
  .user-menu-dropdown {
    background: var(--color-surface-elevated);
    border-color: var(--color-card-border);
    box-shadow: var(--shadow-dark-lg), var(--glow-primary);
    backdrop-filter: blur(20px);
  }
  
  .user-menu-dropdown::before {
    background: var(--color-surface-elevated);
    border-left-color: var(--color-card-border);
    border-top-color: var(--color-card-border);
  }
}

.user-menu-dropdown.active { 
  opacity: 1; 
  visibility: visible; 
  transform: none; 
}

.user-menu-dropdown::before {
  content: '';
  position: absolute;
  top: -6px;
  right: 14px;
  width: 12px;
  height: 12px;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  border-top: 1px solid var(--color-border);
  transform: rotate(45deg);
}

.user-menu-item {
  display: block;
  width: 100%;
  padding: 0.875rem 1rem;
  border: none;
  background: none;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 500;
}

.user-menu-item:hover {
  background: var(--color-secondary);
  color: var(--color-primary);
}

.user-menu-item:first-child {
  border-top-left-radius: 12px;
  border-top-right-radius: 12px;
}

.user-menu-item:last-child {
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 12px;
}

/* Enhanced Sync Status */
.sync-status {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-top: 1rem;
  padding: 0.75rem;
  background: var(--color-hover);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.sync-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-success);
  transition: all var(--transition-fast);
}

.sync-indicator.syncing {
  background: var(--color-warning);
  animation: pulse 1.5s infinite;
}

.sync-indicator.offline {
  background: var(--color-error);
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(1.1); }
}

/* Enhanced Mobile Responsive */
@media (max-width: 480px) {
  .auth-modal {
    width: 100vw;
    max-width: 100vw;
    height: auto;
    max-height: 85vh;
    border-radius: 20px 20px 0 0;
    padding: 1.5rem 1rem clamp(1rem, 2vh, 1.5rem);
    margin: 0;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    transform: translateY(8px) scale(1);
  }
  
  .auth-header h2 {
    font-size: 1.4rem;
  }
  .auth-brand__icon { font-size: 1.6rem; }
  .auth-form { gap: 1rem; }
  .form-group input { min-height: 48px; }

  .auth-button-primary { 
    width: 100%; 
    border-radius: 14px; 
  }
  .auth-button { min-height: 52px; }
  
  .user-menu-dropdown {
    right: -1rem;
    left: -1rem;
    min-width: auto;
  }

  #user-label { display: none; }
}

@media (max-width: 640px) {
  #user-label { display: none; }
  .user-menu-button { 
    min-height: 36px; 
    padding: 0.375rem 0.625rem; 
  }
  .user-avatar { 
    width: 24px; 
    height: 24px; 
    font-size: 0.8rem; 
  }
}

@media (max-width: 768px) {
  .nav .user-menu-button {
    width: 100%;
    justify-content: flex-start;
    padding: 0.75rem 1rem;
    min-height: 48px;
    border: 1px solid var(--color-card-border);
    background: var(--color-surface);
  }
  .nav #user-label { display: inline; }
}

/* Respect device safe areas */
.auth-modal {
  padding-bottom: calc(1rem + env(safe-area-inset-bottom));
}

/* Enhanced grabber for bottom sheet */
@media (max-width: 480px) {
  .auth-modal::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 4px;
    border-radius: 999px;
    background: var(--color-border);
    transition: background var(--transition-fast);
  }
  
  .auth-modal:hover::before {
    background: var(--color-primary);
  }
}

/* Password strength indicator */
.password-strength {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.password-strength-bar {
  flex: 1;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
}

.password-strength-fill {
  height: 100%;
  transition: all var(--transition-normal);
  border-radius: 2px;
}

.password-strength.weak .password-strength-fill {
  background: var(--color-error);
  width: 25%;
}

.password-strength.fair .password-strength-fill {
  background: var(--color-warning);
  width: 50%;
}

.password-strength.good .password-strength-fill {
  background: var(--color-bamboo);
  width: 75%;
}

.password-strength.strong .password-strength-fill {
  background: var(--color-success);
  width: 100%;
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-border: #000000;
    --color-text: #000000;
    --color-background: #ffffff;
  }
  
  .auth-button {
    border: 2px solid currentColor;
  }
}

/* Print styles */
@media print {
  .auth-overlay,
  .user-menu-dropdown {
    display: none !important;
  }
}