/* Ecat site: footer, floating controls, scroll reveal, responsive. */
/* Footer */

.site-footer {
  margin-top: 0;
  padding-block: 56px 24px;
  border-top: 1px solid var(--line);
  background: var(--bg-deep);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.9fr 0.9fr 1.4fr;
  gap: 32px;
}

.footer-brand .brand {
  margin-bottom: 14px;
}

.footer-brand p {
  max-width: 34ch;
  font-size: 0.88rem;
}

.footer-license {
  margin-top: 14px;
  color: var(--muted-2) !important;
  font-size: 0.78rem !important;
}

.footer-license a {
  color: var(--muted);
  border-bottom: 1px solid var(--line-strong);
}

.footer-license a:hover {
  color: var(--orange-soft);
}

.footer-links h2,
.footer-meta h2 {
  margin-bottom: 12px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--ink);
}

.footer-links a {
  display: block;
  width: fit-content;
  margin-block: 7px;
  font-size: 0.88rem;
  color: var(--muted);
  transition: color 0.18s ease;
}

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

.footer-meta p {
  margin-block: 7px;
  font-size: 0.84rem;
}

.footer-meta a {
  color: var(--muted);
  border-bottom: 1px solid transparent;
}

.footer-meta a:hover {
  color: var(--orange-soft);
  border-bottom-color: rgba(232, 116, 59, 0.5);
}

.footer-info {
  margin-top: 12px;
  font-size: 0.72rem;
  line-height: 1.9;
  color: var(--muted-2);
}

.footer-info b {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--orange-soft);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.footer-bottom p {
  font-size: 0.74rem;
  color: var(--muted-2);
}

/* Back to top pet */

.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: var(--z-float);
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: rgba(18, 26, 35, 0.92);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.36);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition:
    opacity 0.25s ease,
    visibility 0.25s ease,
    transform 0.25s ease,
    border-color 0.18s ease;
}

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

.back-top:hover {
  border-color: rgba(232, 116, 59, 0.65);
  transform: translateY(-2px);
}

.back-top img {
  width: 46px;
  height: 46px;
  pointer-events: none;
}

/* Scroll reveal (only when JS is present) */

.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* Responsive */

@media (max-width: 1080px) {
  .site-nav {
    gap: 14px;
  }

  .site-nav a {
    font-size: 0.82rem;
  }

  .brand-cn {
    display: none;
  }
}

@media (max-width: 960px) {
  .menu-toggle {
    display: inline-grid;
    place-items: center;
  }

  .site-nav {
    position: absolute;
    top: calc(var(--header) + 1px);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 18px;
    border-bottom: 1px solid var(--line);
    background: rgba(10, 14, 19, 0.98);
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.3);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding-block: 12px;
    border-bottom: 1px solid var(--line);
    font-size: 0.95rem;
  }

  .site-nav a:last-child {
    border-bottom: 0;
  }

  .site-nav a::after {
    display: none;
  }

  .hero {
    min-height: auto;
    padding-block: 40px 56px;
  }

  .hero-grid,
  .intro-grid {
    grid-template-columns: 1fr;
  }

  .hero-stage {
    max-width: 360px;
    justify-self: center;
  }

  .hero-title {
    max-width: 14ch;
  }

  .intro-visual {
    order: -1;
  }

  .pet-stack {
    min-height: 300px;
  }

  .pet-stack-main {
    width: 220px;
  }

  .pet-stack-a {
    width: 104px;
  }

  .pet-stack-b {
    width: 94px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat:nth-child(3) {
    border-left: 0;
    padding-left: 0;
  }

  .stat {
    border-top: 1px solid var(--line);
  }

  .stat:nth-child(-n + 2) {
    border-top: 0;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .header-inner {
    gap: 12px;
  }

  .header-actions .icon-btn {
    display: none;
  }

  .hero-stage {
    max-width: 280px;
  }

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
  }

  .pet-stack {
    min-height: 240px;
  }

  .pet-stack-main {
    width: 176px;
  }

  .pet-stack-a {
    width: 86px;
  }

  .pet-stack-b {
    width: 78px;
  }

  .arch-row {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .arch-label {
    padding-top: 0;
  }

  .page-hero-pet {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .back-top {
    right: 16px;
    bottom: 16px;
    width: 56px;
    height: 56px;
  }

  .back-top img {
    width: 40px;
    height: 40px;
  }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header,
  .back-top {
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: var(--bg-elev);
  }
}