/* Shared footer: landing, book reader shell, sign-in, and other public layouts */

.public-footer {
  --public-footer-pad-x: clamp(1.5rem, 5vw, 3rem);
  --public-footer-pad-y: clamp(2.25rem, 5vw, 3.5rem);
  position: relative;
  padding: var(--public-footer-pad-y) var(--public-footer-pad-x);
  border-top: 1px solid color-mix(in srgb, var(--color-subtle-dark) 12%, transparent);
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--color-subtle-light) 65%, var(--color-bg)) 0%,
      var(--color-bg) 38%,
      var(--color-bg) 100%
    );
  color: color-mix(in srgb, var(--color-ink) 72%, transparent);
}

/* Landing page: match --landing-bg from landing.css */
.public-footer--landing {
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--color-subtle-light) 55%, var(--landing-bg)) 0%,
      var(--landing-bg) 42%,
      var(--landing-bg) 100%
    );
}

.public-footer--landing .public-footer__inner {
  max-width: none;
}

.public-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    color-mix(in srgb, var(--color-selected-dark) 35%, transparent) 20%,
    color-mix(in srgb, var(--color-link) 28%, transparent) 50%,
    color-mix(in srgb, var(--color-selected-dark) 35%, transparent) 80%,
    transparent 100%
  );
  opacity: 0.85;
  pointer-events: none;
}

.public-footer__inner {
  max-width: none;
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(14rem, 1.1fr) minmax(20rem, 2fr) minmax(14rem, 1fr);
  gap: clamp(1.25rem, 3vw, 2.25rem);
  align-items: start;
  text-align: left;
}

.public-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.public-footer__brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.public-footer__brand-link:hover {
  color: var(--color-link);
}

.public-footer__tagline {
  margin: 0;
  font-size: 0.92rem;
  color: color-mix(in srgb, var(--color-ink) 60%, transparent);
}

.public-footer__links {
  display: grid;
  grid-template-columns: repeat(3, minmax(9rem, 1fr));
  gap: 1rem 1.25rem;
}

.public-footer__group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.public-footer__group-title {
  margin: 0 0 0.25rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-ink) 50%, transparent);
}

.public-footer__nav {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
}

.public-footer__nav-link {
  color: color-mix(in srgb, var(--color-ink) 78%, transparent);
  text-decoration: none;
  padding: 0.15rem 0;
  margin: 0;
  border-radius: 0;
  font-size: 0.9rem;
  font-weight: 500;
  transition:
    color 160ms ease,
    background 160ms ease;
}

.public-footer__nav-link:hover {
  color: var(--color-link);
}

.public-footer__nav-link:focus-visible {
  outline: 2px solid var(--color-selected-dark);
  outline-offset: 2px;
}

.public-footer__nav-link--primary {
  font-weight: 600;
  color: var(--color-link);
}

.public-footer__support-note {
  margin: 0.35rem 0 0;
  font-size: 0.82rem;
  line-height: 1.4;
  color: color-mix(in srgb, var(--color-ink) 52%, transparent);
}

.public-footer__nav-dot {
  display: inline-block;
  width: 3px;
  height: 3px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--color-ink) 28%, transparent);
  vertical-align: middle;
}

.public-footer__meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.4rem;
  font-size: 0.9375rem;
  line-height: 1.5;
}

.public-footer__credit {
  margin: 0;
  font-weight: 500;
  color: color-mix(in srgb, var(--color-ink) 88%, transparent);
}

.public-footer__attribution {
  margin: 0;
  font-size: 0.875rem;
  color: color-mix(in srgb, var(--color-ink) 58%, transparent);
  letter-spacing: 0.01em;
}

.public-footer__byline {
  font-weight: 400;
  color: color-mix(in srgb, var(--color-ink) 48%, transparent);
}

.public-footer__link {
  color: var(--color-link);
  text-decoration: none;
  font-weight: 500;
  transition: color 160ms ease, opacity 160ms ease;
}

.public-footer__link:hover {
  color: color-mix(in srgb, var(--color-link) 88%, var(--color-ink) 12%);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.public-footer__link--emphasis {
  font-weight: 600;
}

.public-footer__copyright {
  margin: 0.1rem 0 0;
  font-size: 0.82rem;
  color: color-mix(in srgb, var(--color-ink) 52%, transparent);
}

@media (max-width: 720px) {
  .public-footer__links {
    grid-template-columns: 1fr;
    gap: 1.1rem;
  }
}

@media (max-width: 520px) {
  .public-footer__inner {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .public-footer__links {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .public-footer__meta {
    gap: 0.3rem;
  }
}