/* CSS Variables for easy theming */
:root {
  --primary-color: #007bff;
  --primary-hover: #0056b3;
  --secondary-color: #6c757d;
  --secondary-hover: #5a6268;
  --success-color: #28a745;
  --error-color: #dc3545;
  --background-color: #ffffff;
  --text-color: #333333;
  --border-color: #ddd;
  --backdrop-color: rgba(0, 0, 0, 0.5);
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15), 0 6px 10px rgba(0, 0, 0, 0.1);
  --transition: 0.3s ease;
}

/* Modal Container - Hidden by default */
.auth-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
  opacity: 0;
  transition: opacity var(--transition);
}

/* Modal Visible State */
.auth-modal.show {
  display: flex;
  opacity: 1;
  align-items: center;
  justify-content: center;
}

/* Backdrop Overlay */
.auth-modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--backdrop-color);
  animation: fadeIn var(--transition);
}

/* Modal Content Card */
.auth-modal-content {
  position: relative;
  background-color: var(--background-color);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  max-width: 400px;
  width: 90%;
  padding: 32px;
  z-index: 1001;
  animation: slideIn var(--transition);
  max-height: 90vh;
  overflow-y: auto;
}

/* Modal Header */
.auth-modal-content h2 {
  margin: 0 0 12px 0;
  font-size: 24px;
  font-weight: 600;
  color: var(--text-color);
  text-align: center;
}

.auth-modal-content p {
  margin: 0 0 24px 0;
  font-size: 14px;
  color: #666;
  text-align: center;
  line-height: 1.5;
}

/* Form Styling */
#auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Email Input */
#email-input {
  width: 100%;
  padding: 12px 16px;
  font-size: 16px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  box-sizing: border-box;
  transition: border-color var(--transition), box-shadow var(--transition);
  font-family: inherit;
}

#email-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

#email-input::placeholder {
  color: #999;
}

/* Consent Checkbox Label */
.consent-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  font-size: 14px;
  color: var(--text-color);
  line-height: 1.5;
}

.consent-label input[type="checkbox"] {
  margin-top: 2px;
  cursor: pointer;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.consent-label span {
  flex: 1;
}

/* Primary Submit Button */
#submit-email {
  width: 100%;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  background-color: var(--primary-color);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color var(--transition), transform 0.1s ease;
  font-family: inherit;
}

#submit-email:hover:not(:disabled) {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

#submit-email:active:not(:disabled) {
  transform: translateY(0);
}

#submit-email:disabled {
  background-color: #ccc;
  cursor: not-allowed;
  opacity: 0.6;
}

#submit-email:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.3);
}

/* Secondary Cancel Button */
#cancel-auth.secondary,
button.secondary {
  width: 100%;
  padding: 12px 24px;
  font-size: 16px;
  font-weight: 600;
  color: #ffffff;
  background-color: var(--secondary-color);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color var(--transition), transform 0.1s ease;
  font-family: inherit;
}

#cancel-auth.secondary:hover,
button.secondary:hover {
  background-color: var(--secondary-hover);
  transform: translateY(-1px);
}

#cancel-auth.secondary:active,
button.secondary:active {
  transform: translateY(0);
}

#cancel-auth.secondary:focus,
button.secondary:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(108, 117, 125, 0.3);
}

/* Auth Message */
.auth-message {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  text-align: center;
  display: none;
  animation: fadeIn var(--transition);
}

.auth-message.success {
  display: block;
  background-color: #d4edda;
  color: var(--success-color);
  border: 1px solid #c3e6cb;
}

.auth-message.error {
  display: block;
  background-color: #f8d7da;
  color: var(--error-color);
  border: 1px solid #f5c6cb;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Responsive Design - Mobile */
@media (max-width: 600px) {
  .auth-modal-content {
    padding: 24px 20px;
    border-radius: 12px 12px 0 0;
    max-height: 95vh;
    width: 100%;
    margin-top: auto;
  }

  .auth-modal.show {
    align-items: flex-end;
  }

  .auth-modal-content h2 {
    font-size: 20px;
  }

  .auth-modal-content p {
    font-size: 13px;
  }

  #email-input,
  #submit-email,
  #cancel-auth.secondary {
    font-size: 15px;
    padding: 11px 16px;
  }

  .consent-label {
    font-size: 13px;
  }

  @keyframes slideIn {
    from {
      opacity: 0;
      transform: translateY(100%) scale(0.95);
    }
    to {
      opacity: 1;
      transform: translateY(0) scale(1);
    }
  }
}

/* Accessibility - Focus visible for keyboard navigation */
@media (prefers-reduced-motion: reduce) {
  .auth-modal,
  .auth-modal-backdrop,
  .auth-modal-content,
  .auth-message,
  #email-input,
  #submit-email,
  #cancel-auth.secondary {
    animation: none;
    transition: none;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  #email-input,
  #submit-email,
  #cancel-auth.secondary {
    border: 2px solid currentColor;
  }
}