/* ==========================================================================
   JD Packaging — 全站统一页脚（产品页 / 博客页 / 枢纽页共用）
   独立实现，视觉与首页页脚对齐。作用域限定在 .site-footer 内，避免污染各页样式。
   ========================================================================== */

.site-footer {
  background: #0a0a0a;
  color: rgba(255, 255, 255, 0.45);
  font-family: Arial, 'Helvetica Neue', sans-serif;
  font-size: 12px;
  line-height: 1.75;
  padding: 56px 48px 28px;
  margin-top: 0;
}
.site-footer .sf-inner { max-width: 1100px; margin: 0 auto; }
.site-footer .sf-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 40px;
}
.site-footer h4 {
  font-family: Arial, 'Helvetica Neue', sans-serif;
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: #c8a96e;
  margin: 0 0 16px;
}
.site-footer .sf-brand {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 18px;
  letter-spacing: 3px;
  color: #fff;
  margin-bottom: 10px;
}
.site-footer p { margin: 0 0 10px; }
.site-footer a { color: rgba(255, 255, 255, 0.5); text-decoration: none; transition: color 0.3s; }
.site-footer a:hover { color: #c8a96e; }
.site-footer .sf-links a { display: block; padding: 3px 0; }

.site-footer .sf-social { display: flex; gap: 14px; margin-top: 18px; }
.site-footer .sf-social a { opacity: 0.55; transition: opacity 0.3s; display: inline-flex; }
.site-footer .sf-social a:hover { opacity: 1; }
.site-footer .sf-social svg { width: 18px; height: 18px; fill: currentColor; }

.site-footer .sf-certs { display: flex; flex-wrap: wrap; gap: 7px; }
.site-footer .sf-cert {
  font-size: 10.5px;
  letter-spacing: 0.4px;
  padding: 4px 9px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 2px;
  color: rgba(255, 255, 255, 0.6);
  white-space: nowrap;
}

.site-footer .sf-bottom {
  max-width: 1100px;
  margin: 40px auto 0;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 11.5px;
  color: rgba(255, 255, 255, 0.32);
}

@media (max-width: 900px) {
  .site-footer { padding: 44px 24px 24px; }
  .site-footer .sf-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 560px) {
  .site-footer .sf-grid { grid-template-columns: 1fr; }
}