/* ==========================================================================
   Footer — CSI Dry Eye
   ========================================================================== */

.footer {
  background-color: var(--color-bg-navy);
  color: var(--color-text-inverse);
  padding-top: var(--space-5xl);
}

/* ---- Grid ---- */

.footer__grid {
  display: grid;
  gap: var(--space-2xl);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer__grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

/* ---- Brand column ---- */

.footer__col--brand {
  max-width: 300px;
}

.footer__logo img {
  height: 36px;
  width: auto;
  margin-bottom: var(--space-lg);
}

.footer__description {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.6);
  line-height: var(--lh-relaxed);
}

/* ---- Column headings ---- */

.footer__col-title {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-lg);
}

/* ---- Links ---- */

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer__links a,
.footer__link {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__links a:hover,
.footer__link:hover {
  color: #fff;
  text-decoration: none;
}

/* ---- Social icons ---- */

.footer__social {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.footer__social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.6);
  transition: background-color var(--transition-fast),
              color var(--transition-fast);
}

.footer__social a:hover {
  background-color: rgba(255, 255, 255, 0.15);
  color: #fff;
  text-decoration: none;
}

.footer__social svg {
  width: 18px;
  height: 18px;
}

/* ---- Bottom bar ---- */

.footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-block: var(--space-lg);
  margin-top: var(--space-3xl);
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.4);
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
  }
}

.footer__bottom-links {
  display: flex;
  gap: var(--space-lg);
}

.footer__bottom-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
  justify-content: space-between;
}

@media (min-width: 768px) {
  .footer__bottom-inner {
    flex-direction: row;
  }
}

.footer__copyright {
  margin: 0;
}

.footer__legal-link,
.footer__bottom-links a {
  color: rgba(255, 255, 255, 0.4);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__legal-link:hover,
.footer__bottom-links a:hover {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
}