/* ==========================================================
   Firebase Auth — Modern Clean UI
   Version: 2.0
   Scope: #auth-container OR .faf-auth
   ========================================================== */

/* ---------- CSS Variables ---------- */
:is(#auth-container, .faf-auth) {
  /* Colors */
  --c-bg: #0a0f1a;
  --c-card-bg: #12181f;
  --c-card-bg-elevated: #1a2332;
  --c-text: #f1f5f9;
  --c-text-muted: #94a3b8;
  --c-text-dim: #64748b;
  --c-border: #1e293b;
  --c-border-hover: #334155;
  --c-input-bg: #0f1419;
  --c-input-text: #e2e8f0;
  --c-input-placeholder: #64748b;
  
  /* Accent colors */
  --c-primary: #3b82f6;
  --c-primary-hover: #2563eb;
  --c-primary-glow: rgba(59, 130, 246, 0.15);
  --c-success: #10b981;
  --c-success-bg: rgba(16, 185, 129, 0.1);
  --c-error: #ef4444;
  --c-error-bg: rgba(239, 68, 68, 0.1);
  --c-warning: #f59e0b;
  
  /* Layout */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px var(--c-primary-glow);
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
  --transition-slow: 0.3s ease;
}

/* ---------- Base Container ---------- */
:is(#auth-container, .faf-auth) {
  max-width: 420px;
  margin: 2.5rem auto;
  padding: 2rem 1.75rem;
  background: var(--c-card-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  color: var(--c-text);
  color-scheme: dark;
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
  font-size: 0.9375rem;
  line-height: 1.5;
}

:is(#auth-container, .faf-auth),
:is(#auth-container, .faf-auth) *,
:is(#auth-container, .faf-auth) *::before,
:is(#auth-container, .faf-auth) *::after {
  box-sizing: border-box;
}

/* ---------- Headings ---------- */
:is(#auth-container, .faf-auth) h1,
:is(#auth-container, .faf-auth) h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  color: var(--c-text);
  letter-spacing: -0.02em;
}

:is(#auth-container, .faf-auth) .faf-subtitle {
  color: var(--c-text-muted);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}

/* ---------- Social Login (Google) ---------- */
:is(#auth-container, .faf-auth) .faf-social {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

:is(#auth-container, .faf-auth) .faf-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  width: 100%;
  min-height: 48px;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--c-border);
  background: var(--c-card-bg-elevated);
  color: var(--c-text);
  font-weight: 500;
  font-size: 0.9375rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

:is(#auth-container, .faf-auth) .faf-btn:hover {
  background: #1e2a3a;
  border-color: var(--c-border-hover);
  transform: translateY(-1px);
}

:is(#auth-container, .faf-auth) .faf-btn:active {
  transform: translateY(0);
}

:is(#auth-container, .faf-auth) .faf-btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--c-card-bg), 0 0 0 4px var(--c-primary);
}

:is(#auth-container, .faf-auth) .faf-btn[disabled],
:is(#auth-container, .faf-auth) .faf-btn.is-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

:is(#auth-container, .faf-auth) .faf-btn-google {
  background: #fff;
  color: #1f2937;
  border-color: #e5e7eb;
}

:is(#auth-container, .faf-auth) .faf-btn-google:hover {
  background: #f9fafb;
  border-color: #d1d5db;
}

:is(#auth-container, .faf-auth) .faf-btn-google svg {
  width: 20px;
  height: 20px;
}

/* ---------- Divider ---------- */
:is(#auth-container, .faf-auth) .faf-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.25rem 0;
  color: var(--c-text-dim);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

:is(#auth-container, .faf-auth) .faf-divider::before,
:is(#auth-container, .faf-auth) .faf-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-border), transparent);
}

/* ---------- Form & Inputs ---------- */
:is(#auth-container, .faf-auth) .faf-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

:is(#auth-container, .faf-auth) .faf-fields {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

:is(#auth-container, .faf-auth) .faf-field {
  position: relative;
}

:is(#auth-container, .faf-auth) .faf-field label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--c-text-muted);
  margin-bottom: 0.375rem;
}

:is(#auth-container, .faf-auth) .faf-fields input,
:is(#auth-container, .faf-auth) input[type="email"],
:is(#auth-container, .faf-auth) input[type="password"],
:is(#auth-container, .faf-auth) input[type="text"] {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--c-input-bg);
  color: var(--c-input-text);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  outline: none;
  transition: all var(--transition-fast);
}

:is(#auth-container, .faf-auth) .faf-fields input::placeholder {
  color: var(--c-input-placeholder);
}

:is(#auth-container, .faf-auth) .faf-fields input:hover {
  border-color: var(--c-border-hover);
}

:is(#auth-container, .faf-auth) .faf-fields input:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px var(--c-primary-glow), var(--shadow-glow);
}

:is(#auth-container, .faf-auth) .faf-fields input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Input validation states */
:is(#auth-container, .faf-auth) .faf-fields input[aria-invalid="true"],
:is(#auth-container, .faf-auth) .faf-fields input.is-invalid {
  border-color: var(--c-error);
  box-shadow: 0 0 0 3px var(--c-error-bg);
}

:is(#auth-container, .faf-auth) .faf-fields input.is-valid {
  border-color: var(--c-success);
  box-shadow: 0 0 0 3px var(--c-success-bg);
}

/* Password hint */
:is(#auth-container, .faf-auth) .faf-hint,
:is(#auth-container, .faf-auth) #pw-hint {
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  margin-top: 0.375rem;
  min-height: 1.25rem;
}

/* ---------- Action Buttons ---------- */
:is(#auth-container, .faf-auth) .faf-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

:is(#auth-container, .faf-auth) .faf-actions button,
:is(#auth-container, .faf-auth) .faf-actions .btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  min-height: 48px;
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

/* Primary button (Login) */
:is(#auth-container, .faf-auth) .faf-actions button[data-faf="login"],
:is(#auth-container, .faf-auth) .faf-actions .btn--primary {
  background: var(--c-primary);
  color: #fff;
  border: none;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

:is(#auth-container, .faf-auth) .faf-actions button[data-faf="login"]:hover,
:is(#auth-container, .faf-auth) .faf-actions .btn--primary:hover {
  background: var(--c-primary-hover);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
  transform: translateY(-1px);
}

/* Secondary button (Register) */
:is(#auth-container, .faf-auth) .faf-actions button[data-faf="register"],
:is(#auth-container, .faf-auth) .faf-actions .btn--secondary {
  background: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border);
}

:is(#auth-container, .faf-auth) .faf-actions button[data-faf="register"]:hover,
:is(#auth-container, .faf-auth) .faf-actions .btn--secondary:hover {
  background: var(--c-card-bg-elevated);
  border-color: var(--c-border-hover);
}

:is(#auth-container, .faf-auth) .faf-actions button:active {
  transform: translateY(0);
}

:is(#auth-container, .faf-auth) .faf-actions button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--c-card-bg), 0 0 0 4px var(--c-primary);
}

:is(#auth-container, .faf-auth) .faf-actions button[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

/* ---------- Message Banner ---------- */
:is(#auth-container, .faf-auth) #message,
:is(#auth-container, .faf-auth) .faf-message {
  padding: 0.875rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  margin-top: 1rem;
  display: none;
  animation: faf-slideIn 0.2s ease;
}

:is(#auth-container, .faf-auth) #message.success,
:is(#auth-container, .faf-auth) .faf-message.success {
  background: var(--c-success-bg);
  color: var(--c-success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

:is(#auth-container, .faf-auth) #message.error,
:is(#auth-container, .faf-auth) .faf-message.error {
  background: var(--c-error-bg);
  color: var(--c-error);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

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

/* ---------- Secondary Actions (Verify/Resend) ---------- */
:is(#auth-container, .faf-auth) .faf-secondary-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--c-border);
}

:is(#auth-container, .faf-auth) .faf-secondary-actions button,
:is(#auth-container, .faf-auth) button[data-faf="verify"],
:is(#auth-container, .faf-auth) button[data-faf="resendVerification"] {
  flex: 1;
  min-width: 140px;
  padding: 0.625rem 1rem;
  font-size: 0.8125rem;
  background: transparent;
  color: var(--c-primary);
  border: 1px solid var(--c-primary);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

:is(#auth-container, .faf-auth) .faf-secondary-actions button:hover,
:is(#auth-container, .faf-auth) button[data-faf="verify"]:hover,
:is(#auth-container, .faf-auth) button[data-faf="resendVerification"]:hover {
  background: var(--c-primary-glow);
}

/* ---------- Utility Classes ---------- */
:is(#auth-container, .faf-auth) .is-hidden {
  display: none !important;
}

:is(#auth-container, .faf-auth) .is-loading {
  position: relative;
  pointer-events: none;
}

:is(#auth-container, .faf-auth) .is-loading::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--c-card-bg);
  opacity: 0.7;
  border-radius: inherit;
}

/* ---------- Loader Spinner ---------- */
:is(#auth-container, .faf-auth) .faf-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: faf-spin 0.6s linear infinite;
}

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

/* ========== POST-LOGIN MENU ========== */
:is(#auth-container, .faf-auth) #post-login-menu {
  width: 100%;
}

:is(#auth-container, .faf-auth) #post-login-menu .menu-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

:is(#auth-container, .faf-auth) #post-login-menu .menu-actions .btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.625rem;
  width: 100%;
  min-height: 52px;
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--c-border);
  background: var(--c-card-bg-elevated);
  color: var(--c-text);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

:is(#auth-container, .faf-auth) #post-login-menu .menu-actions .btn:hover {
  background: #1e2a3a;
  border-color: var(--c-border-hover);
  transform: translateY(-1px);
}

:is(#auth-container, .faf-auth) #post-login-menu .menu-actions .btn:active {
  transform: translateY(0);
}

/* Buy Tokens - Primary */
:is(#auth-container, .faf-auth) #post-login-menu .menu-actions [data-faf="buyTokens"],
:is(#auth-container, .faf-auth) #post-login-menu .menu-actions .btn--primary {
  background: linear-gradient(135deg, var(--c-primary), #6366f1);
  border: none;
  color: #fff;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

:is(#auth-container, .faf-auth) #post-login-menu .menu-actions [data-faf="buyTokens"]:hover,
:is(#auth-container, .faf-auth) #post-login-menu .menu-actions .btn--primary:hover {
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

/* Logout - Danger */
:is(#auth-container, .faf-auth) #post-login-menu .menu-actions [data-faf="logout"],
:is(#auth-container, .faf-auth) #post-login-menu .menu-actions .btn--danger {
  background: transparent;
  border-color: var(--c-error);
  color: var(--c-error);
}

:is(#auth-container, .faf-auth) #post-login-menu .menu-actions [data-faf="logout"]:hover,
:is(#auth-container, .faf-auth) #post-login-menu .menu-actions .btn--danger:hover {
  background: var(--c-error-bg);
}

/* Icon styling */
:is(#auth-container, .faf-auth) #post-login-menu .menu-actions .btn .emoji,
:is(#auth-container, .faf-auth) #post-login-menu .menu-actions .btn svg {
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
}

/* ========== MODAL (Token Purchase) ========== */
@keyframes faf-fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes faf-scaleIn {
  from {
    opacity: 0;
    transform: translate(-50%, -48%) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}

:is(#auth-container, .faf-auth) #token-backdrop {
  position: fixed !important;
  inset: 0 !important;
  background: rgba(0, 0, 0, 0.6) !important;
  backdrop-filter: blur(4px) !important;
  -webkit-backdrop-filter: blur(4px) !important;
  z-index: 9997 !important;
  display: none;
  animation: faf-fadeIn 0.2s ease both;
}

:is(#auth-container, .faf-auth) #token-confirmation {
  position: fixed !important;
  left: 50% !important;
  top: 50% !important;
  transform: translate(-50%, -50%) !important;
  width: min(90vw, 400px) !important;
  max-height: 85vh !important;
  overflow: auto !important;
  background: var(--c-card-bg) !important;
  color: var(--c-text) !important;
  border: 1px solid var(--c-border) !important;
  border-radius: var(--radius-lg) !important;
  box-shadow: var(--shadow-lg) !important;
  z-index: 9998 !important;
  display: none;
  animation: faf-scaleIn 0.25s cubic-bezier(0.16, 1, 0.3, 1) both;
  padding: 1.5rem !important;
}

:is(#auth-container, .faf-auth) #token-confirmation h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 0 0 1rem;
}

:is(#auth-container, .faf-auth) #token-confirmation select,
:is(#auth-container, .faf-auth) #token-select {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--c-input-bg);
  color: var(--c-input-text);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  cursor: pointer;
  margin-bottom: 1rem;
}

:is(#auth-container, .faf-auth) #token-confirmation .modal-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

:is(#auth-container, .faf-auth) #token-confirmation .modal-actions button {
  flex: 1;
  min-height: 44px;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

:is(#auth-container, .faf-auth) #confirm-buy {
  background: var(--c-primary);
  color: #fff;
  border: none;
}

:is(#auth-container, .faf-auth) #confirm-buy:hover {
  background: var(--c-primary-hover);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 480px) {
  :is(#auth-container, .faf-auth) {
    margin: 1rem;
    padding: 1.5rem 1.25rem;
    border-radius: var(--radius-md);
  }
  
  :is(#auth-container, .faf-auth) h1,
  :is(#auth-container, .faf-auth) h2 {
    font-size: 1.25rem;
  }
  
  :is(#auth-container, .faf-auth) .faf-fields input,
  :is(#auth-container, .faf-auth) .faf-actions button {
    min-height: 52px;
  }
}

/* ========== REDUCED MOTION ========== */
@media (prefers-reduced-motion: reduce) {
  :is(#auth-container, .faf-auth) *,
  :is(#auth-container, .faf-auth) *::before,
  :is(#auth-container, .faf-auth) *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ========== TOKEN BALANCE ========== */
:is(#auth-container, .faf-auth) .token-balance {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--c-card-bg-elevated);
  border-radius: var(--radius-md);
  margin-bottom: 1rem;
}

:is(#auth-container, .faf-auth) .token-balance #token-count {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-primary);
}