/* ==========================================================================
   FOOTER
   --------------------------------------------------------------------------
   Navy closing band. The logo is reversed with a CSS filter (no duplicate
   asset — CLAUDE.md §5). Brand line, in-page navigation, legal line and a
   back-to-top control. A faint pixel cluster echoes the mark.
   ========================================================================== */

.site-footer {
  position: relative;
  padding-block: clamp(3rem, 6vw, 4.5rem) var(--space-xl);
  background-color: var(--c-navy);
  color: var(--c-on-dark-body);
  isolation: isolate;
}

.site-footer__decor {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: radial-gradient(ellipse 40% 60% at 100% 0%, rgba(0, 169, 182, 0.14), transparent 70%);
  pointer-events: none;
}

[dir="rtl"] .site-footer__decor {
  scale: -1 1;
}

.site-footer__pixels {
  position: absolute;
  inset-block-start: 1.5rem;
  inset-inline-end: var(--gutter);
  inline-size: 7rem;
  opacity: 0.35;
}

.site-footer__top {
  display: grid;
  gap: var(--space-xl);
  justify-items: center;
  text-align: center;
  padding-block-end: var(--space-xl);
  border-block-end: 1px solid var(--c-glass-border);
}

@media (min-width: 64rem) {
  .site-footer__top {
    grid-template-columns: auto 1fr;
    align-items: center;
    justify-items: start;
    text-align: start;
  }
}

.site-footer__brand {
  display: grid;
  gap: var(--space-sm);
  justify-items: inherit;
}

.site-footer__logo {
  inline-size: 8.5rem;
  block-size: auto;
  filter: brightness(0) invert(1);
}

.site-footer__tagline {
  font-size: var(--fs-small);
  color: var(--c-on-dark-meta);
}

/* In-page navigation */
.site-footer__nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2xs) var(--space-md);
}

@media (min-width: 64rem) {
  .site-footer__nav ul {
    justify-content: flex-end;
  }
}

.site-footer__nav a {
  display: inline-flex;
  align-items: center;
  min-block-size: 44px;
  padding-inline: var(--space-xs);
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--c-on-dark-body);
  transition: color var(--dur-micro) var(--ease-out);
}

.site-footer__nav a:hover {
  color: var(--c-teal);
}

/* Bottom row */
.site-footer__bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  padding-block-start: var(--space-lg);
  font-size: var(--fs-caption);
  color: var(--c-on-dark-meta);
  text-align: center;              /* mobile: copyright line centred */
}

@media (min-width: 48rem) {
  .site-footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: start;
  }
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  min-block-size: 44px;
  padding-inline: var(--space-md);
  border-radius: var(--r-pill);
  border: 1px solid var(--c-glass-border);
  color: var(--c-on-dark);
  font-size: var(--fs-caption);
  font-weight: 600;
  transition: border-color var(--dur-micro) var(--ease-out), background-color var(--dur-micro) var(--ease-out);
}

.to-top:hover {
  border-color: var(--c-teal);
  background-color: var(--c-teal-a12);
}

.to-top svg {
  inline-size: 1rem;
  block-size: 1rem;
  color: var(--c-teal);
  transition: translate var(--dur-micro) var(--ease-out);
}

.to-top:hover svg {
  translate: 0 -3px;
}