/**
 * 页脚样式
 * 包含页脚内容、底部链接、回到顶部按钮
 */

/* ========== 站点页脚 ========== */
.site-footer {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  color: #e2e8f0;
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  margin-top: auto;
}

/* ========== 页脚内容 ========== */
.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
  color: #ffffff;
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-bottom: var(--spacing-sm);
}

.footer-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 30px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary-500), var(--color-secondary-500));
  border-radius: 1px;
}

/* ========== 公司介绍区 ========== */
.footer-about {
  max-width: 320px;
}

.footer-logo {
  margin-bottom: var(--spacing-md);
}

.footer-logo-img {
  height: 45px;
  width: auto;
  object-fit: contain;
}

.footer-desc {
  color: #94a3b8;
  line-height: var(--leading-relaxed);
  margin-bottom: var(--spacing-lg);
  font-size: var(--text-sm);
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.contact-item i {
  color: var(--color-primary-400);
  font-size: var(--text-lg);
  margin-top: 2px;
  flex-shrink: 0;
}

.contact-detail {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.contact-label {
  font-size: var(--text-xs);
  color: #64748b;
  display: block;
}

.contact-detail a,
.contact-detail span {
  color: #e2e8f0;
  text-decoration: none;
  transition: color var(--transition-fast);
  font-size: var(--text-sm);
  word-break: break-all;
}

.contact-detail a:hover {
  color: var(--color-primary-400);
}

/* ========== 链接列表 ========== */
.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  font-size: var(--text-sm);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.footer-links a::before {
  content: '›';
  color: var(--color-primary-400);
  font-size: var(--text-lg);
  transition: transform var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-primary-400);
  transform: translateX(4px);
}

.footer-links a:hover::before {
  transform: translateX(2px);
}

/* ========== 社交链接 ========== */
.footer .social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.footer .social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: rgba(255, 255, 255, 0.05);
  color: #e2e8f0;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.footer .social-link:hover {
  background: var(--color-primary-500);
  color: #ffffff;
  transform: translateY(-3px);
  border-color: var(--color-primary-500);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

/* ========== 二维码 ========== */
.qrcode {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.qrcode-img {
  width: 100px;
  height: 100px;
  border-radius: var(--radius);
  margin-bottom: var(--spacing-sm);
}

.qrcode p {
  font-size: var(--text-xs);
  color: #94a3b8;
  text-align: center;
  margin: 0;
}

/* ========== 服务优势 ========== */
.footer-features {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.footer-feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--radius);
  transition: all var(--transition-base);
}

.footer-feature:hover {
  background: rgba(255, 255, 255, 0.05);
}

.feature-icon {
  font-size: 20px;
  color: var(--color-primary-400);
  flex-shrink: 0;
}

.feature-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.feature-title {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: #e2e8f0;
}

.feature-desc {
  font-size: var(--text-xs);
  color: #94a3b8;
}

/* ========== 分割线 ========== */
.footer-divider {
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.1) 50%,
    transparent 100%
  );
  margin-bottom: var(--spacing-xl);
}

/* ========== 页脚底部 ========== */
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-copyright p {
  margin: 0;
  font-size: var(--text-sm);
  color: #94a3b8;
}

.footer-links-inline {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xs);
  font-size: var(--text-sm);
}

.footer-links-inline a {
  color: #94a3b8;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links-inline a:hover {
  color: var(--color-primary-400);
}

.footer-links-inline .separator {
  color: #475569;
}

.icp-info {
  color: #64748b;
  font-size: var(--text-xs);
  margin: 0;
}

/* ========== 回到顶部按钮 ========== */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-primary-600) 100%);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: linear-gradient(135deg, var(--color-primary-600) 0%, var(--color-primary-700) 100%);
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.5);
}

.back-to-top:active {
  transform: translateY(-2px);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
  }

  .footer-about {
    max-width: 100%;
  }
}

@media (max-width: 768px) {
  .site-footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }

  .footer-links-inline {
    justify-content: center;
  }

  .back-to-top {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 44px;
    height: 44px;
  }

  .back-to-top svg {
    width: 18px;
    height: 18px;
  }
}

@media (max-width: 480px) {
  .footer-links-inline {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .footer-links-inline .separator {
    display: none;
  }
}