/* ssd site — footer, back-to-top, motion, responsive */
/* ---------- footer ---------- */
.site-footer {
  padding: 64px 0 28px;
  background: #040914;
  border-top: 1px solid var(--line);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 36px;
}
.footer-brand img { width: 64px; margin-bottom: 12px; }
.footer-brand strong { display: block; font-size: 1.1rem; }
.footer-brand p { margin: 4px 0 12px; color: var(--muted); font-size: 0.9rem; }
.footer-note { color: var(--faint); font-size: 0.78rem; line-height: 1.6; }
.footer-col h3 {
  margin: 0 0 14px;
  color: #fff;
  font-size: 0.82rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
.footer-col a {
  display: block;
  padding: 4px 0;
  color: var(--muted);
  font-size: 0.9rem;
}
.footer-col a:hover { color: var(--cyan); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 46px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.82rem;
}
.footer-bottom p { margin: 0; }
.footer-info { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.footer-info b { color: var(--muted); font-weight: 680; }
.footer-info .dot { color: var(--faint); }
.icp-link { color: var(--faint); }
.icp-link:hover { color: var(--cyan); }

/* ---------- back to top (mascot) ---------- */
.backtop {
  position: fixed;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(22px, env(safe-area-inset-bottom));
  z-index: 90;
  display: grid;
  place-items: center;
  width: 68px; height: 68px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px) scale(0.9);
  background: radial-gradient(circle at 50% 35%, rgba(94, 151, 240, 0.28), rgba(7, 14, 32, 0.86) 68%);
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  box-shadow: 0 18px 40px rgba(1, 6, 20, 0.55);
  backdrop-filter: blur(10px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0.25s;
}
.backtop.is-on { opacity: 1; visibility: visible; transform: none; }
.backtop:hover { border-color: var(--gold); transform: translateY(-3px); }
.backtop img {
  grid-area: 1 / 1;
  width: 46px; height: 46px;
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
}
.backtop .backtop-hover { opacity: 0; transform: scale(0.9); }
.backtop:hover .backtop-idle,
.backtop:focus-visible .backtop-idle { opacity: 0; transform: scale(0.9); }
.backtop:hover .backtop-hover,
.backtop:focus-visible .backtop-hover { opacity: 1; transform: none; }

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .mascot-float, .float-chip, .eyebrow .dot { animation: none; }
}

/* ---------- responsive header/hero/footer ---------- */
@media (max-width: 980px) {
  .hero { min-height: auto; padding-top: 64px; }
  .hero-grid { grid-template-columns: 1fr; gap: 18px; }
  .hero-art { min-height: 320px; order: -1; }
  .mascot-float { width: min(52%, 260px); }
  .float-chip { font-size: 0.64rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: fixed;
    inset: 72px 0 auto 0;
    z-index: 99;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    max-height: calc(100dvh - 72px);
    padding: 14px 20px 24px;
    overflow-y: auto;
    background: rgba(7, 14, 32, 0.97);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(18px);
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s;
  }
  body.nav-open .site-nav { opacity: 1; visibility: visible; transform: none; }
  .site-nav a { padding: 13px 14px; font-size: 1rem; }
  .site-nav .nav-lang, .site-nav .nav-cta { margin-left: 0; justify-content: center; }
  .site-nav .nav-cta { margin-top: 8px; }
  .header-inner { min-height: 64px; }
  .site-nav { inset-block-start: 64px; max-height: calc(100dvh - 64px); }
  .section { padding: 64px 0; }
  .page-hero { padding: 52px 0 32px; }
  .page-hero .mascot-mini { width: 82px; margin-left: 16px; }
}

@media (max-width: 560px) {
  .container { width: calc(100% - 28px); }
  .hero { padding: 44px 0 64px; }
  .hero-art { min-height: 250px; }
  .mascot-float { width: min(58%, 210px); }
  .chip-1 { top: 4%; }
  .chip-3 { bottom: 2%; }
  .hero-actions .btn { flex: 1 1 auto; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .backtop { width: 58px; height: 58px; }
  .backtop img { width: 40px; height: 40px; }
}