/* ─────────────────────────────────────────────────────────────────
   auth-modal.css — Unified split-pane auth modal (OTP + Google).
   WCAG 2.1 AA: focus trapping, aria-modal, Escape key handled in JS.
───────────────────────────────────────────────────────────────── */

/* ── Backdrop ───────────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* ── Modal root (centres the pane) ─────────────────────────────── */
.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 201;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

/* ── Split pane ─────────────────────────────────────────────────── */
.auth-modal__pane {
  display: flex;
  width: 100%;
  max-width: 860px;
  max-height: calc(100dvh - 2rem);
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
  animation: modal-in var(--duration-normal) var(--ease-spring) both;
}

@keyframes modal-in {
  from { opacity: 0; transform: scale(0.96) translateY(10px); }
  to   { opacity: 1; transform: scale(1)    translateY(0); }
}

@media (prefers-reduced-motion: reduce) {
  .auth-modal__pane { animation: none; }
}

/* ── Sidebar (value-prop panel) ─────────────────────────────────── */
.auth-modal__sidebar {
  flex: 0 0 42%;
  background: linear-gradient(155deg, #1e1b4b 0%, #0f172a 100%);
  padding: var(--space-10) var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  overflow-y: auto;
}

.auth-modal__sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.auth-modal__mark {
  width: 40px;
  height: 40px;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-extrabold);
  font-size: 0.7rem;
  letter-spacing: var(--tracking-wide);
  flex-shrink: 0;
}

.auth-modal__brand-name {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-bold);
  color: rgba(255, 255, 255, 0.9);
}

.auth-modal__sidebar-copy { flex: 1; }

.auth-modal__sidebar-headline {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-extrabold);
  color: #fff;
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-6);
}

.auth-modal__sidebar-bullets {
  list-style: none;
  padding: 0;
  margin: 0 0 var(--space-8) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.auth-modal__sidebar-bullets li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.72);
  line-height: var(--line-height-normal);
}

.auth-modal__sidebar-bullets li::before {
  content: '✓';
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  background: rgba(37, 99, 235, 0.22);
  color: #93c5fd;
  border-radius: 50%;
  font-size: 0.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
  font-weight: var(--font-weight-bold);
}

.auth-modal__trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: auto;
}

/* ── Content (auth form) ────────────────────────────────────────── */
.auth-modal__content {
  flex: 1;
  position: relative;
  padding: var(--space-10) var(--space-8);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

/* Close button */
.auth-modal__close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: background var(--duration-fast), color var(--duration-fast);
}

.auth-modal__close:hover {
  background: var(--color-surface-subtle);
  color: var(--color-text-primary);
}

.auth-modal__close:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.auth-modal__heading {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-text-primary);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-2);
}

.auth-modal__sub {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  margin-bottom: var(--space-6);
}

/* ── Trust note (Google-only modal) ────────────────────────────── */
.auth-modal__trust-note {
  margin-top: var(--space-4);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
  line-height: 1.5;
}

/* ── Error banner ───────────────────────────────────────────────── */
.modal-error {
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  color: var(--color-error);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  margin-bottom: var(--space-4);
}

/* ── Step visibility ────────────────────────────────────────────── */
.modal-step { display: none; }
.modal-step--active { display: flex; flex-direction: column; flex: 1; }

/* ── Form field ─────────────────────────────────────────────────── */
.modal-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.modal-field label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.modal-field input[type="tel"] {
  height: 46px;
  padding: 0 var(--space-4);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-body);
  color: var(--color-text-primary);
  width: 100%;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}

.modal-field input[type="tel"]:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

/* ── Age gate ───────────────────────────────────────────────────── */
.modal-age-gate {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.modal-age-gate input[type="checkbox"] {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 1px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.modal-age-gate label {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  line-height: var(--line-height-normal);
}

/* ── Flywheel consent (Epic 15.1 — unbundled, optional) ─────────── */
.modal-consent {
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-5);
}

.modal-consent__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.modal-consent__item input[type="checkbox"] {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 2px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.modal-consent__item label {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  cursor: pointer;
  line-height: var(--line-height-relaxed);
}

/* ── Divider ────────────────────────────────────────────────────── */
.modal-divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  color: var(--color-text-tertiary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  margin: var(--space-4) 0;
}

.modal-divider::before,
.modal-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

/* Google button overrides */
.btn--google {
  background: var(--color-surface);
  color: var(--color-text-primary);
  border: 1.5px solid var(--color-border);
  font-weight: var(--font-weight-medium);
}

.btn--google:hover {
  background: var(--color-surface-subtle);
  border-color: var(--color-border-strong);
}

.btn--google:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ── Back button (step 2) ───────────────────────────────────────── */
.modal-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2) 0;
  margin-bottom: var(--space-5);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast);
}

.modal-back:hover { color: var(--color-primary); }

.modal-back:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ── OTP sent notice ────────────────────────────────────────────── */
.modal-otp-notice {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  background: var(--color-surface-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-5);
  line-height: var(--line-height-normal);
}

/* ── OTP digit inputs ───────────────────────────────────────────── */
.otp-inputs {
  display: flex;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-5);
}

.otp-digit {
  width: 48px;
  height: 56px;
  text-align: center;
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  caret-color: var(--color-primary);
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast), background var(--duration-fast);
  -moz-appearance: textfield;
}

.otp-digit::-webkit-outer-spin-button,
.otp-digit::-webkit-inner-spin-button { -webkit-appearance: none; }

.otp-digit:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-focus);
}

.otp-digit:not(:placeholder-shown) {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

/* ── Resend row ─────────────────────────────────────────────────── */
.modal-resend {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  flex-wrap: wrap;
}

#modal-btn-resend {
  color: var(--color-primary);
  background: none;
  border: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
  min-height: 24px;
}

#modal-btn-resend:disabled {
  color: var(--color-text-tertiary);
  text-decoration: none;
  cursor: not-allowed;
}

#modal-btn-resend:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ─────────────────────────────────────────────────────────────────
   RESPONSIVE: mobile collapses to bottom sheet, single column
───────────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .auth-modal {
    padding: 0;
    align-items: flex-end;
  }

  .auth-modal__pane {
    flex-direction: column;
    border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
    max-height: 92dvh;
    animation: modal-slide-up var(--duration-normal) var(--ease-out) both;
  }

  @keyframes modal-slide-up {
    from { transform: translateY(100%); }
    to   { transform: translateY(0); }
  }

  .auth-modal__sidebar {
    flex: 0 0 auto;
    padding: var(--space-5);
    flex-direction: row;
    align-items: center;
    gap: var(--space-4);
  }

  .auth-modal__sidebar-copy { display: none; }
  .auth-modal__trust-badges { display: none; }

  .auth-modal__content { padding: var(--space-6) var(--space-5); }

  .otp-inputs { gap: var(--space-1); }
  .otp-digit  { width: 44px; height: 52px; }
}