/* ==========================================================================
   页脚
   ========================================================================== */

.footer {
  position: relative;
  z-index: 1;
  margin-top: var(--section-py);
  padding: 80px 0 32px;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, transparent, rgba(255, 255, 255, 0.02));
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--border);
}

.footer__brand .nav__brand {
  margin-bottom: 16px;
}
.footer__brand p {
  color: var(--text-mute);
  font-size: 14px;
  max-width: 280px;
  line-height: 1.6;
}
.footer__brand p.brand-zh {
  font-family: var(--font-display);
  font-size: 24px;
  color: var(--text);
  margin-bottom: 8px;
}

.footer__col h4 {
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-mute);
  font-weight: 500;
  margin-bottom: 20px;
}
.footer__col ul { list-style: none; padding: 0; margin: 0; }
.footer__col li { margin-bottom: 12px; }
.footer__col a {
  color: var(--text-soft);
  font-size: 14px;
  transition: color 240ms var(--ease);
}
.footer__col a:hover { color: var(--accent); }

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 28px;
  color: var(--text-mute);
  font-size: 12px;
}
.footer__bottom .certs {
  display: flex;
  gap: 16px;
  align-items: center;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
}
.footer__bottom .certs span {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-soft);
}

@media (max-width: 900px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}
@media (max-width: 480px) {
  .footer__grid { grid-template-columns: 1fr; }
}