/* ----------------------------------------------------------------------------
 * Pre-auth surface styles.
 *
 * Scoped to the centered AuthCardLayout used by /login, /signup,
 * /password-reset, /verify-email. All values come from tokens.css — no
 * literal colors, sizes, or spacings in this file.
 * ------------------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-md);
  line-height: var(--line-height-body);
  color: var(--color-fg-primary);
  background-color: var(--color-bg-app);
  -webkit-font-smoothing: antialiased;
}

.auth-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
}

.auth-shell__inner {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.auth-wordmark {
  text-align: center;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-2xl);
  letter-spacing: var(--letter-spacing-heading);
  color: var(--color-accent);
  user-select: none;
}

.auth-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-7);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.auth-card__title {
  margin: 0;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-xl);
  letter-spacing: var(--letter-spacing-heading);
}

.auth-card__subtitle {
  margin: 0;
  color: var(--color-fg-secondary);
  font-size: var(--font-size-md);
}

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

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.field__label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-fg-secondary);
}

.field__input {
  font-family: inherit;
  font-size: var(--font-size-md);
  color: var(--color-fg-primary);
  background-color: var(--color-bg-input);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  transition: border-color var(--duration-base) var(--ease-standard),
    box-shadow var(--duration-base) var(--ease-standard);
  width: 100%;
}

.field__input:focus-visible {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--focus-ring);
}

.field__input:disabled {
  color: var(--color-fg-disabled);
  cursor: not-allowed;
}

/* ---------- PasswordInput ---------- */

.password-input {
  position: relative;
}

.password-input__field {
  padding-right: var(--space-9);
}

.password-input__toggle {
  position: absolute;
  top: 50%;
  right: var(--space-2);
  transform: translateY(-50%);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-xs);
  padding: var(--space-1) var(--space-2);
  font: inherit;
  font-size: var(--font-size-sm);
  color: var(--color-fg-secondary);
  cursor: pointer;
  min-height: 28px;
}

.password-input__toggle:hover {
  background-color: var(--color-bg-hover);
  color: var(--color-fg-primary);
}

.password-input__toggle:focus-visible {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--focus-ring);
}

/* ---------- PasswordStrengthIndicator ---------- */

.password-strength {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-top: var(--space-1);
}

.password-strength__bars {
  display: flex;
  gap: var(--space-1);
}

.password-strength__bar {
  flex: 1 1 0;
  height: 4px;
  border-radius: var(--radius-pill);
  background-color: var(--color-border-light);
  transition: background-color var(--duration-fast) var(--ease-standard);
}

.password-strength[data-strength="weak"] .password-strength__bar:nth-child(1) {
  background-color: var(--color-danger-fg);
}

.password-strength[data-strength="fair"] .password-strength__bar:nth-child(-n + 2) {
  background-color: var(--color-warning-fg);
}

.password-strength[data-strength="strong"] .password-strength__bar {
  background-color: var(--color-success-fg);
}

.password-strength__label {
  font-size: var(--font-size-xs);
  color: var(--color-fg-tertiary);
}

/* ---------- OAuthButton ---------- */

.oauth-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  width: 100%;
  font: inherit;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-fg-primary);
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  min-height: 44px;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--duration-base) var(--ease-standard),
    border-color var(--duration-base) var(--ease-standard);
}

.oauth-button:hover {
  background-color: var(--color-bg-hover);
  border-color: var(--color-border-focus);
}

.oauth-button:focus-visible {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: var(--focus-ring);
}

.oauth-button__icon {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

/* ---------- InAppAlert ---------- */

.alert {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-size: var(--font-size-md);
}

.alert[data-variant="info"] {
  color: var(--color-info-fg);
  background-color: var(--color-info-bg);
  border-color: var(--color-info-fg);
}

.alert[data-variant="success"] {
  color: var(--color-success-fg);
  background-color: var(--color-success-bg);
  border-color: var(--color-success-fg);
}

.alert[data-variant="warning"] {
  color: var(--color-warning-fg);
  background-color: var(--color-warning-bg);
  border-color: var(--color-warning-fg);
}

.alert[data-variant="danger"] {
  color: var(--color-danger-fg);
  background-color: var(--color-danger-bg);
  border-color: var(--color-danger-fg);
}

.alert__icon {
  flex: 0 0 auto;
  margin-top: var(--space-1);
}

/* ---------- Page layout primitives ---------- */

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

.auth-mode {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.auth-submit {
  font: inherit;
  font-weight: var(--font-weight-medium);
  color: var(--color-bg-card);
  background-color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: var(--space-3) var(--space-4);
  min-height: 44px;
  cursor: pointer;
  transition: background-color var(--duration-base) var(--ease-standard),
    border-color var(--duration-base) var(--ease-standard);
}

.auth-submit:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.auth-submit:active {
  background-color: var(--color-accent-active);
  border-color: var(--color-accent-active);
}

.auth-submit:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-fg-tertiary);
  font-size: var(--font-size-sm);
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  flex: 1 1 0;
  height: 1px;
  background-color: var(--color-border-light);
}

.auth-instruction {
  margin: 0;
  color: var(--color-fg-secondary);
  font-size: var(--font-size-md);
}

.auth-secondary {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--color-fg-secondary);
}

.auth-secondary a,
.auth-toggle-prompt a {
  color: var(--color-accent);
  text-decoration: none;
}

.auth-secondary a:hover,
.auth-toggle-prompt a:hover {
  text-decoration: underline;
}

.auth-secondary a:focus-visible,
.auth-toggle-prompt a:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-xs);
}

.auth-toggle-prompt {
  margin: 0;
  padding-top: var(--space-2);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-fg-secondary);
}

/* ---------- Utility ---------- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}