/* Footer styles */
.site-footer {
  background-color: var(--neutral-900);
  padding: var(--space-12) 0 var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer-column:first-child {
  grid-column: 1 / -1;
}

@media (min-width: 1024px) {
  .footer-column:first-child {
    grid-column: auto;
  }
}

.footer-title {
  font-size: var(--font-lg);
  font-weight: 600;
  color: white;
  margin-bottom: var(--space-4);
}

.footer-description {
  font-size: var(--font-sm);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: var(--space-5);
  max-width: 90%;
}

.footer-social {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.social-link {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
  position: relative;
}

.social-link::before {
  content: "";
  display: block;
  width: 18px;
  height: 18px;
  background-color: white;
  mask-size: contain;
  -webkit-mask-size: contain;
  mask-repeat: no-repeat;
  -webkit-mask-repeat: no-repeat;
  mask-position: center;
  -webkit-mask-position: center;
}

.weixin::before {
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 9h.01'/%3E%3Cpath d='M15 9h.01'/%3E%3Cpath d='M22 14.5v.5a2 2 0 0 1-2 2h-1a1 1 0 0 1-1-1v-1a1 1 0 0 0-1-1h-1a1 1 0 0 0-1 1v1a1 1 0 0 1-1 1h-3a1 1 0 0 1-1-1v-3a1 1 0 0 1 1-1h1a1 1 0 0 0 1-1v-1a1 1 0 0 1 1-1h2a1 1 0 0 1 1 1v1a1 1 0 0 0 1 1h1a1 1 0 0 1 1 1v3'/%3E%3Cpath d='M8 12h.01'/%3E%3Cpath d='M2 9.5v5a2.5 2.5 0 0 0 2.5 2.5h3.5a2.5 2.5 0 0 0 2.5-2.5v-5A2.5 2.5 0 0 0 8 7H4.5A2.5 2.5 0 0 0 2 9.5'/%3E%3Cpath d='M16 12h.01'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 9h.01'/%3E%3Cpath d='M15 9h.01'/%3E%3Cpath d='M22 14.5v.5a2 2 0 0 1-2 2h-1a1 1 0 0 1-1-1v-1a1 1 0 0 0-1-1h-1a1 1 0 0 0-1 1v1a1 1 0 0 1-1 1h-3a1 1 0 0 1-1-1v-3a1 1 0 0 1 1-1h1a1 1 0 0 0 1-1v-1a1 1 0 0 1 1-1h2a1 1 0 0 1 1 1v1a1 1 0 0 0 1 1h1a1 1 0 0 1 1 1v3'/%3E%3Cpath d='M8 12h.01'/%3E%3Cpath d='M2 9.5v5a2.5 2.5 0 0 0 2.5 2.5h3.5a2.5 2.5 0 0 0 2.5-2.5v-5A2.5 2.5 0 0 0 8 7H4.5A2.5 2.5 0 0 0 2 9.5'/%3E%3Cpath d='M16 12h.01'/%3E%3C/svg%3E");
}

.weibo::before {
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M19 3l-4 4'/%3E%3Cpath d='M11 11c-1.657 0-3 1.343-3 3s1.343 3 3 3 3-1.343 3-3-1.343-3-3-3z'/%3E%3Cpath d='M11 2a9 9 0 0 0-9 9m18 0a9 9 0 0 0-9-9m9 9a9 9 0 0 1-9 9m0-18a9 9 0 0 0-9 9'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M19 3l-4 4'/%3E%3Cpath d='M11 11c-1.657 0-3 1.343-3 3s1.343 3 3 3 3-1.343 3-3-1.343-3-3-3z'/%3E%3Cpath d='M11 2a9 9 0 0 0-9 9m18 0a9 9 0 0 0-9-9m9 9a9 9 0 0 1-9 9m0-18a9 9 0 0 0-9 9'/%3E%3C/svg%3E");
}

.qq::before {
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 4a5 5 0 0 0-10 0v5a5 5 0 0 1-5 5h14a5 5 0 0 1-5-5V4'/%3E%3Cpath d='M13 18h-2a2 2 0 0 0-2 2v1h6v-1a2 2 0 0 0-2-2z'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M18 4a5 5 0 0 0-10 0v5a5 5 0 0 1-5 5h14a5 5 0 0 1-5-5V4'/%3E%3Cpath d='M13 18h-2a2 2 0 0 0-2 2v1h6v-1a2 2 0 0 0-2-2z'/%3E%3C/svg%3E");
}

.social-link:hover {
  background-color: var(--primary-500);
  transform: translateY(-2px);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links li a {
  font-size: var(--font-sm);
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-normal), transform var(--transition-normal);
  display: inline-block;
}

.footer-links li a:hover {
  color: var(--primary-500);
  transform: translateX(4px);
}

.footer-bottom {
  margin-top: var(--space-12);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-info {
  margin-bottom: var(--space-4);
}

@media (min-width: 768px) {
  .footer-info {
    margin-bottom: 0;
  }
}

.footer-info p {
  font-size: var(--font-xs);
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.5;
}

.footer-links-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-4);
}

.footer-links-bottom a {
  font-size: var(--font-xs);
  color: rgba(255, 255, 255, 0.5);
  transition: color var(--transition-normal);
}

.footer-links-bottom a:hover {
  color: var(--primary-500);
}