/* Auth modal overlay, container, tabs, forms, buttons, and social login. */

.auth-modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
}

.auth-modal__backdrop {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal-backdrop);
  background: rgba(0, 0, 0, 0.5);
}

.auth-modal__container {
  position: relative;
  z-index: var(--z-modal);
  width: 100%;
  max-width: 420px;
  max-height: 90vh;
  overflow-y: auto;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-xl);
}

.auth-modal__close {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-sm);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  font-size: var(--font-size-2xl);
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  line-height: 1;
}

.auth-modal__close:hover {
  color: var(--color-text);
  background: var(--color-bg-muted);
}

/* ---- Tabs ---- */

.auth-modal__tabs {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}

.auth-modal__tab {
  flex: 1;
  padding: var(--space-sm) var(--space-md);
  border: none;
  background: none;
  font-family: var(--font-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 150ms ease, border-color 150ms ease;
}

.auth-modal__tab:hover {
  color: var(--color-text);
}

.auth-modal__tab--active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

/* ---- Form ---- */

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

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

.auth-form__group label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.auth-form__group--checkbox {
  flex-direction: row;
  align-items: center;
}

.auth-form__group--checkbox label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  cursor: pointer;
}

.auth-form__group--checkbox input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

.form-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-base);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
  box-sizing: border-box;
}

.form-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input::placeholder {
  color: var(--color-text-muted);
}

/* ---- Messages ---- */

.auth-form__message {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  min-height: 0;
}

.auth-form__message:empty {
  display: none;
}

.auth-form__message--error {
  color: var(--color-error);
}

.auth-form__message--success {
  color: var(--color-success);
}

/* ---- Links ---- */

.auth-form__link {
  display: inline-block;
  font-size: var(--font-size-sm);
  color: var(--color-primary);
  text-decoration: none;
  text-align: center;
}

.auth-form__link:hover {
  text-decoration: underline;
}

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: var(--line-height-normal);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease;
  text-decoration: none;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
}

.btn--full {
  width: 100%;
}

/* ---- Social login ---- */

.auth-social {
  margin-top: var(--space-lg);
}

.auth-social__divider {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.auth-social__divider::before,
.auth-social__divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.auth-social__buttons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.btn--social {
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  font-size: var(--font-size-sm);
  padding: var(--space-sm);
}

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

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

/* ---- Forgot-password panel heading ---- */

.auth-modal__panel h2 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--space-md);
  color: var(--color-text);
}

/* ---- Mobile ---- */

@media (max-width: 480px) {
  .auth-modal {
    padding: 0;
    align-items: flex-end;
  }

  .auth-modal__container {
    max-width: 100%;
    max-height: 95vh;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: var(--space-lg) var(--space-md) var(--space-xl);
  }

  .auth-social__buttons {
    grid-template-columns: 1fr 1fr;
  }
}