body {
  background:
    linear-gradient(90deg, transparent calc(50% - 0.5px), var(--color-grid) 50%, transparent calc(50% + 0.5px)),
    var(--color-canvas);
}

:root {
  --account-bg: var(--color-canvas);
  --account-panel: var(--color-surface);
  --account-border: var(--color-border);
  --account-text: var(--color-text);
  --account-soft: var(--color-text-soft);
  --account-muted: var(--color-text-muted);
  --account-focus: var(--color-text);
}

.auth-shell {
  width: min(100% - 3rem, 72rem);
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: minmax(16rem, 0.8fr) minmax(22rem, 1.2fr);
  align-items: stretch;
  margin: 0 auto;
  border-inline: 1px solid var(--color-border);
}

.auth-rail {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--space-8);
  border-right: var(--border-width-hairline) solid var(--color-border);
}

.auth-brand {
  display: flex;
  align-items: flex-start;
  padding: 0;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-decoration: none;
  text-transform: uppercase;
}

.auth-rail-copy {
  max-width: 18rem;
  padding-top: var(--space-8);
  border-top: var(--border-width-hairline) solid var(--color-border);
}

.auth-rail-copy p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-label);
  text-transform: uppercase;
}

.auth-rail-copy span {
  display: block;
  margin-top: var(--space-4);
  color: var(--color-text-soft);
  font-size: var(--font-size-sm);
}

.auth-brand::before {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  margin-right: 0.7rem;
  border: 1px solid currentColor;
  content: "A/";
  letter-spacing: -0.08em;
}

.auth-card {
  align-self: center;
  padding: clamp(2rem, 6vw, 5.5rem);
}

.auth-eyebrow {
  margin: 0 0 2rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.auth-card h1 {
  max-width: 10ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 7vw, 5.5rem);
  font-weight: 550;
  letter-spacing: -0.065em;
  line-height: 0.92;
  text-wrap: balance;
}

.auth-intro {
  max-width: 34rem;
  margin: 1.5rem 0 0;
  color: var(--color-text-soft);
}

.social-login {
  margin-top: 2.5rem;
}

.social-login h2 {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  letter-spacing: var(--letter-spacing-label);
  text-transform: uppercase;
}

.social-login-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
  margin-top: 1rem;
}

.social-login-actions .secondary-button {
  width: 100%;
}

.social-privacy-note {
  margin: 1rem 0 0;
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

.legal-checkbox {
  display: grid !important;
  grid-template-columns: 1.25rem 1fr;
  gap: 0.75rem;
  align-items: start;
  margin-top: 1.25rem !important;
  font-size: 0.84rem !important;
  font-weight: 400 !important;
  line-height: 1.55;
}

.legal-checkbox input {
  width: 1.25rem;
  min-height: 1.25rem;
  height: 1.25rem;
  margin-top: 0.15rem;
}

.legal-checkbox a { text-decoration-thickness: 1px; text-underline-offset: 0.2em; }

.link-button {
  min-height: 2.75rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.auth-divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 2rem 0 0;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
}

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

.auth-divider + .auth-form {
  margin-top: 1rem;
}

.auth-retry {
  margin-top: 1.5rem;
}

.auth-form,
.profile-form {
  display: grid;
  gap: 0.65rem;
  margin-top: 2.5rem;
}

.auth-form label,
.profile-form label {
  margin-top: 0.7rem;
  font-size: 0.82rem;
  font-weight: 700;
}

.auth-form button,
.profile-form button {
  justify-self: start;
  margin-top: 1rem;
}

.field-help {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.auth-status {
  min-height: 1.65rem;
  margin: 1.5rem 0 0;
  padding-left: 0;
  color: var(--color-text-soft);
  font-size: 0.9rem;
}

.auth-status:not(:empty)::before {
  margin-right: 0.6rem;
  color: var(--color-text-muted);
  content: "—";
}

.auth-status[data-state="error"] {
  padding: 0.75rem;
  border-left: 3px double var(--color-text);
  background: repeating-linear-gradient(-45deg, transparent, transparent 5px, rgba(255,255,255,0.035) 5px, rgba(255,255,255,0.035) 6px);
  color: var(--color-text);
}

.auth-status[data-state="success"] {
  padding: 0.75rem;
  border: 1px solid var(--color-text-muted);
  color: var(--color-text);
}

.auth-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-grid);
  color: var(--color-text-soft);
  font-size: 0.85rem;
}

.auth-links a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
}

.secondary-button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 0;
  background: transparent;
  color: var(--color-text);
  font-weight: 700;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.secondary-button:hover {
  border-color: var(--color-highlight);
  background: var(--color-text);
  color: var(--color-inverse);
}

@media (max-width: 46rem) {
  body { background: var(--color-canvas); }
  .auth-shell {
    width: min(100% - 2rem, 36rem);
    min-height: 100vh;
    grid-template-columns: 1fr;
    align-content: start;
    border-inline: 0;
  }
  .auth-brand {
    min-height: 5rem;
    align-items: center;
    padding: 1rem 0;
    border: 0;
  }
  .auth-rail { padding: var(--space-4) 0 var(--space-6); border-right: 0; border-bottom: var(--border-width-hairline) solid var(--color-border); }
  .auth-rail-copy { max-width: none; padding-top: var(--space-4); }
  .auth-rail-copy span { margin-top: var(--space-2); }
  .auth-card { padding: 3rem 0; }
  .auth-card h1 { font-size: clamp(2.75rem, 14vw, 4.5rem); }
  .auth-form button { width: 100%; }
  .social-login-actions { grid-template-columns: 1fr; }
}