.footer {
  background: #0A0D14;
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 60px 0 30px;
  color: rgba(255,255,255,0.7);
  font-size: 14px;
}

.footer__inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px;
}

/* Brand */
.footer__brand {
  margin-bottom: 40px;
}
.footer__logo {
  height: 40px; width: auto; margin-bottom: 12px;
}
.footer__tagline {
  font-size: 14px; color: var(--color-gray); max-width: 300px;
}

/* Grid */
.footer__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-bottom: 40px;
}

.footer__col-title {
  color: var(--color-white); font-size: 15px; font-weight: 600;
  margin-bottom: 16px; font-family: var(--font-heading);
}

.footer__link {
  display: block; color: rgba(255,255,255,0.6); font-size: 14px;
  padding: 4px 0; transition: color var(--transition-base);
}
.footer__link:hover { color: var(--color-cyan); }

/* Social */
.footer__social {
  display: flex; gap: 12px; margin-bottom: 30px; flex-wrap: wrap;
}
.footer__social-link {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(255,255,255,0.08); color: rgba(255,255,255,0.6);
  transition: all var(--transition-base);
}
.footer__social-link:hover { background: rgba(0,229,255,0.15); color: var(--color-cyan); }
.footer__social-link--placeholder {
  font-size: 16px; cursor: default; opacity: 0.3;
}

/* Language */
.footer__lang {
  display: flex; align-items: center; gap: 4px; margin-bottom: 30px;
}
.footer__lang-link {
  color: rgba(255,255,255,0.5); font-size: 13px; transition: color var(--transition-base); text-decoration: none;
}
.footer__lang-link:hover { color: var(--color-cyan); }
.footer__lang-link--active { color: var(--color-cyan); font-weight: 600; }
.footer__lang-divider { color: rgba(255,255,255,0.2); font-size: 12px; }

/* Bottom */
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 20px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
}
.footer__copyright { color: var(--color-gray); font-size: 13px; }
.footer__icp { font-size: 12px; }
.footer__icp a { color: var(--color-gray); transition: color var(--transition-base); }
.footer__icp a:hover { color: var(--color-cyan); }
.footer__icp-divider { margin: 0 8px; color: rgba(255,255,255,0.2); }

/* Back to top */
.back-to-top {
  position: fixed; bottom: 30px; right: 30px; z-index: 999;
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-cyan), var(--color-tech-green));
  color: #fff; display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: all var(--transition-smooth);
  box-shadow: 0 4px 15px rgba(0,229,255,0.3);
}
.back-to-top--visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-3px); box-shadow: 0 6px 20px rgba(0,229,255,0.4); }

/* Responsive */
@media (max-width: 1024px) {
  .footer__grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
  .footer__inner { padding: 0 24px; }
}
@media (max-width: 768px) {
  .footer__grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .footer__inner { padding: 0 16px; }
  .footer__bottom { flex-direction: column; text-align: center; }
}