body[data-system-scope="auth"] {
  --form-control-min-height: 3rem;
  --form-control-radius: .55rem;
  /* --form-control-border: definição única em application.css (D2). */
  --form-control-background: var(--paper);
  --form-control-color: var(--ink-900);
  --form-focus-color: var(--accent-500);
  --form-label-font-size: .84rem;
  --form-label-color: var(--ink-700);
  --form-help-color: var(--ink-500);
  background:
    radial-gradient(circle at 12% 12%, color-mix(in srgb, var(--accent-500) 9%, transparent), transparent 32rem),
    linear-gradient(145deg, var(--bone), var(--paper));
}

body[data-system-scope="auth"] .site-header {
  padding-left: calc(clamp(1rem, 4vw, 3rem) + env(safe-area-inset-left, 0px));
  padding-right: calc(clamp(1rem, 4vw, 3rem) + env(safe-area-inset-right, 0px));
  padding-top: calc(.75rem + env(safe-area-inset-top, 0px));
}

.auth-site-header { position: relative; }
.auth-site-header .theme-toggle {
  position: absolute;
  right: calc(clamp(1rem, 4vw, 3rem) + env(safe-area-inset-right, 0px));
}

.auth-shell {
  width: min(100%, 70rem);
  box-sizing: border-box;
  min-height: calc(100vh - 12rem);
  min-height: calc(100svh - 12rem);
  display: grid;
  grid-template-columns: minmax(16rem, .85fr) minmax(19rem, 1fr);
  align-items: center;
  gap: clamp(2rem, 7vw, 7rem);
  margin-inline: auto;
  padding-top: clamp(2.5rem, 8vw, 6.5rem);
  padding-right: calc(1rem + env(safe-area-inset-right, 0px));
  padding-bottom: clamp(2.5rem, 8vw, 6.5rem);
  padding-left: calc(1rem + env(safe-area-inset-left, 0px));
}

.auth-story {
  display: grid;
  align-content: center;
  gap: 1.25rem;
}

.auth-story > * {
  animation: auth-rise .5s ease-out both;
}

.auth-story > :nth-child(2) { animation-delay: .05s; }
.auth-story > :nth-child(3) { animation-delay: .1s; }
.auth-story > :nth-child(4) { animation-delay: .15s; }

.auth-story h1 {
  max-width: 12ch;
  font-size: clamp(2.6rem, 6vw, 5.6rem);
}

.auth-story__copy {
  max-width: 36rem;
  margin: 0;
  color: var(--ink-700);
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.75;
}

.auth-story__proof {
  width: fit-content;
  margin: .5rem 0 0;
  border-left: 2px solid var(--accent-500);
  padding-left: 1rem;
  color: var(--ink-500);
  font-size: .86rem;
}

.auth-panel {
  border: 1px solid color-mix(in srgb, var(--ink-700) 22%, transparent);
  border-radius: 1rem;
  background: color-mix(in srgb, var(--paper) 96%, transparent);
  box-shadow: 0 1.75rem 5rem color-mix(in srgb, var(--shadow-color) 16%, transparent);
  padding: clamp(1.4rem, 5vw, 2.5rem);
  animation: auth-panel-enter .55s cubic-bezier(.2, .75, .25, 1) both;
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

.auth-panel:focus-within {
  border-color: color-mix(in srgb, var(--accent-500) 42%, transparent);
  box-shadow: 0 1.75rem 5rem color-mix(in srgb, var(--shadow-color) 16%, transparent), 0 0 0 4px var(--accent-soft);
}

.auth-panel__heading {
  display: grid;
  gap: .65rem;
  margin-bottom: 1.6rem;
}

.auth-panel__heading h2 {
  font-size: clamp(1.65rem, 4vw, 2.3rem);
}

.auth-panel__heading p,
.auth-help,
.auth-switch {
  margin: 0;
  color: var(--ink-500);
}

.auth-form {
  display: grid;
  gap: var(--form-stack-gap);
}

.auth-password { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .5rem; }
.auth-password input { min-width: 0; }

.auth-panel .auth-submit {
  width: 100%;
  margin-top: .25rem;
}


.auth-divider {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: .75rem;
  margin-block: 1.2rem;
  color: var(--ink-500);
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .08em;
}

.auth-divider::before,
.auth-divider::after {
  content: "";
  height: 1px;
  background: color-mix(in srgb, var(--ink-700) 18%, transparent);
}

.auth-panel .auth-provider {
  width: 100%;
}

.auth-provider-note {
  margin: .75rem 0 0;
  color: var(--ink-500);
  font-size: var(--form-help-font-size);
  line-height: 1.5;
  text-align: center;
}

.auth-switch {
  margin-top: 1.35rem;
  text-align: center;
  font-size: .88rem;
}

.auth-help { margin-top: .8rem; font-size: var(--form-help-font-size); line-height: 1.5; }
.auth-help a { min-height: 2.75rem; display: inline-flex; align-items: center; }

.auth-errors {
  margin: 0 0 1.25rem;
  border: 1px solid color-mix(in srgb, #b91c1c 38%, transparent);
  border-radius: .55rem;
  background: var(--danger-soft);
  padding: .9rem 1rem;
  color: var(--ink-700);
  font-size: var(--form-error-font-size);
  line-height: 1.5;
}

.auth-errors p {
  margin: 0;
  font-weight: 750;
}

.auth-errors ul {
  margin: .45rem 0 0;
  padding-left: 1.2rem;
}

.auth-token-note {
  border-radius: .6rem;
  background: var(--accent-soft);
  padding: 1rem;
  color: var(--ink-700);
  font-size: .9rem;
}

.auth-footer {
  min-height: 4rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: .6rem;
  border-top: 1px solid color-mix(in srgb, var(--ink-700) 15%, transparent);
  color: var(--ink-500);
  font-size: .78rem;
  padding: .5rem calc(1rem + env(safe-area-inset-right, 0px)) calc(.5rem + env(safe-area-inset-bottom, 0px)) calc(1rem + env(safe-area-inset-left, 0px));
}

.auth-footer a {
  color: var(--ink-500);
  text-decoration: none;
  transition: color .16s ease;
}

@keyframes auth-rise {
  from { opacity: 0; transform: translateY(.65rem); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes auth-panel-enter {
  from { opacity: 0; transform: translateY(1rem) scale(.99); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.auth-footer a:hover {
  color: var(--accent-700);
}

@media (max-width: 760px) {
  .auth-shell {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding-block: 2.5rem 4rem;
  }

  .auth-story h1 {
    max-width: 15ch;
    font-size: clamp(2.35rem, 13vw, 4rem);
  }
}

@media (max-width: 560px) {
  body[data-system-scope="auth"] .site-header { min-height: 3.5rem; }

  .auth-shell {
    width: 100%;
    min-height: auto;
    gap: 1.25rem;
    margin-inline: 0;
    padding: 1.25rem calc(1rem + env(safe-area-inset-right, 0px)) 2.5rem calc(1rem + env(safe-area-inset-left, 0px));
  }

  .auth-story { gap: .5rem; padding-inline: .5rem; }
  .auth-story h1 { max-width: 16ch; font-size: clamp(2.05rem, 10.5vw, 2.85rem); line-height: 1; }
  .auth-story__copy,
  .auth-story__proof { display: none; }

  .auth-panel {
    border-radius: .75rem;
    box-shadow: 0 1.1rem 3rem color-mix(in srgb, var(--shadow-color) 15%, transparent);
    padding: 1.25rem;
  }
  .auth-panel:focus-within {
    box-shadow: 0 1.1rem 3rem color-mix(in srgb, var(--shadow-color) 15%, transparent), 0 0 0 3px var(--accent-soft);
  }
  .auth-panel__heading { margin-bottom: 1.25rem; }
  .auth-footer { min-height: 4.5rem; flex-wrap: wrap; row-gap: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .auth-story > *,
  .auth-panel,
  .auth-submit,
  .auth-panel:focus-within {
    animation: none;
    scroll-behavior: auto;
    transition: none;
  }
}