/* ====================================================================
   FOOTER.CSS — Elements India
   --------------------------------------------------------------------
   Styles for components/footer.html.
   Back-to-top show/hide on scroll is toggled by main.js via
   the .back-to-top--visible class.
   ==================================================================== */


/* --------------------------------------------------------------------
   1. FOOTER SHELL
   -------------------------------------------------------------------- */

.site-footer {
  background-color: var(--color-slate);
  color: rgba(255, 255, 255, 0.75);
  position: relative;
}

.site-footer__top {
  padding-block: var(--space-9) var(--space-8);
}

.footer-grid {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: var(--space-7);
}


/* --------------------------------------------------------------------
   2. BRAND COLUMN
   -------------------------------------------------------------------- */

.footer-col--brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.brand__logo--footer {
  height: 40px;
  width: auto;
  /* logo is dark by default; invert for legibility on the slate footer */
  filter: brightness(0) invert(1);
  opacity: 0.92;
}

.footer-tagline {
  font-size: var(--fs-sm);
  line-height: var(--lh-normal);
  color: rgba(255, 255, 255, 0.65);
  max-width: 34ch;
}

.social-list {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  transition: border-color var(--duration-fast) var(--ease-standard),
              background-color var(--duration-fast) var(--ease-standard);
}

.social-link img {
  filter: brightness(0) invert(1);
  opacity: 0.85;
}

.social-link:hover {
  border-color: var(--color-rust);
  background-color: color-mix(in srgb, var(--color-rust) 15%, transparent);
}


/* --------------------------------------------------------------------
   3. LINK COLUMNS
   -------------------------------------------------------------------- */

.footer-heading {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-4);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.8);
  transition: color var(--duration-fast) var(--ease-standard);
}

.footer-links a:hover {
  color: var(--color-white);
}


/* --------------------------------------------------------------------
   4. CONTACT COLUMN
   -------------------------------------------------------------------- */

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  font-size: var(--fs-sm);
  color: rgba(255, 255, 255, 0.8);
}

.footer-contact img {
  margin-top: 2px;
  filter: brightness(0) invert(1);
  opacity: 0.6;
  flex-shrink: 0;
}

.footer-contact a:hover {
  color: var(--color-white);
}


/* --------------------------------------------------------------------
   5. BOTTOM BAR
   -------------------------------------------------------------------- */

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.site-footer__bottom-inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-5) var(--container-pad);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-copyright,
.footer-credit {
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.5);
}


/* --------------------------------------------------------------------
   6. BACK TO TOP
   -------------------------------------------------------------------- */

.back-to-top {
  position: fixed;
  right: var(--space-6);
  bottom: var(--space-6);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-ink);
  color: var(--color-paper);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-soft);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--duration-base) var(--ease-standard),
              transform var(--duration-base) var(--ease-standard),
              visibility var(--duration-base),
              background-color var(--duration-fast) var(--ease-standard);
  z-index: 90;
}

.back-to-top--visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-rust);
}

.back-to-top__arrow {
  font-size: var(--fs-md);
  line-height: 1;
}