/* 导航栏 */
.site-header .top-bar {
  background: #f5f5f5;
  padding: 8px 0;
  font-size: 13px;
}
.site-header .hotline {
  color: #c81623;
  font-weight: bold;
}
.main-nav {
  background: #fff;
  border-bottom: 1px solid #eee;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 15px;
}
.main-nav .logo {
  font-size: 18px;
  font-weight: bold;
  color: #333;
  white-space: nowrap;
  display: flex;
  align-items: center;
}
.main-nav .logo img {
  display: block;
  height: 44px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  flex-shrink: 0;
}
.main-nav .logo .logo-text {
  margin-left: 12px;
  font-size: 18px;
  font-weight: bold;
  color: #333;
  white-space: nowrap;
}
/* 仅一级菜单横向排列，二级菜单保持纵向列表 */
.main-nav .nav-menu > ul {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: nowrap;
}
.main-nav .nav-menu > ul > li {
  position: relative;
}
.main-nav .nav-menu > ul > li > a {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  color: #333;
  white-space: nowrap;
}
.main-nav .nav-menu > ul > li > a:hover,
.main-nav .nav-menu > ul > li.open > a {
  color: #c81623;
}

/* 二级下拉菜单：纵向列表，不继承 flex */
.main-nav .nav-menu .dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: #fff;
  border: 1px solid #e8e8e8;
  border-radius: 4px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
  padding: 6px 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  z-index: 1000;
  list-style: none;
  margin: 0;
}
.main-nav .nav-menu .dropdown,
.main-nav .nav-menu .dropdown ul {
  display: block;
}
.main-nav .nav-menu .has-dropdown.open .dropdown {
  opacity: 1;
  visibility: visible;
}
.main-nav .nav-menu .dropdown li {
  display: block;
  margin: 0;
  padding: 0;
}
.main-nav .nav-menu .dropdown a {
  display: block;
  padding: 10px 18px;
  font-size: 13px;
  color: #555;
  line-height: 1.4;
  white-space: nowrap;
}
.main-nav .nav-menu .dropdown a:hover {
  color: #c81623;
  background: #fff5f5;
}
.main-nav .nav-menu .dropdown li + li {
  border-top: none;
}
/* 有二级菜单的项：箭头标识（PC 端可选显示） */
.main-nav .nav-menu .has-dropdown > a .nav-arrow {
  display: none;
}
.nav-search {
  display: flex;
  align-items: center;
  gap: 6px;
}
.nav-search .search-input {
  width: 140px;
  padding: 6px 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 13px;
}
.nav-search .search-btn {
  padding: 6px 14px;
  background: #c81623;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 13px;
}
.nav-search .search-btn:hover {
  background: #a6121d;
}

/* 移动端：汉堡按钮（小屏显示），固定尺寸防止变形 */
.nav-toggle {
  display: none;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  padding: 0;
  border: none;
  background: transparent;
  cursor: pointer;
  position: relative;
  align-items: center;
  justify-content: center;
}
.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background: #333;
  border-radius: 1px;
  position: absolute;
  left: 50%;
  margin-left: -11px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}
.nav-toggle-bar:nth-child(1) {
  top: 13px;
}
.nav-toggle-bar:nth-child(2) {
  top: 21px;
}
.nav-toggle-bar:nth-child(3) {
  top: 29px;
}
body.nav-open .nav-toggle-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
body.nav-open .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
body.nav-open .nav-toggle-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* 移动端：搜索在导航抽屉内显示，桌面保留右侧 */
.nav-search-desk {
  display: flex;
}
.nav-search-mobile {
  display: none;
}

/* ========== 响应式：平板及以下 收起为抽屉导航 ========== */
@media (max-width: 992px) {
  .nav-inner {
    flex-wrap: nowrap;
    min-height: 44px;
  }
  .main-nav .logo {
    flex: 1;
    min-width: 0;
    order: 1;
  }
  .nav-toggle {
    display: flex;
    order: 2;
    flex-shrink: 0;
  }
  .nav-search-desk {
    display: none;
  }
  .nav-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    max-width: 85vw;
    height: 100vh;
    background: #fff;
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    z-index: 1002;
    overflow-y: auto;
    padding: 70px 0 24px;
    transition: transform 0.3s ease;
    transform: translateX(100%);
  }
  body.nav-open .nav-menu {
    transform: translateX(0);
  }
  /* 移动端必须竖排：用更高优先级覆盖 PC 的 flex */
  .main-nav .nav-menu > ul {
    display: block !important;
    padding: 0 16px;
  }
  .main-nav .nav-menu > ul > li {
    display: block !important;
    width: 100%;
    border-bottom: 1px solid #eee;
    
  }
  .main-nav .nav-menu > ul > li > a {
    display: flex !important;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 14px 12px;
    font-size: 15px;
    box-sizing: border-box;
  }
  .main-nav .nav-menu .has-dropdown > a .nav-arrow {
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;

    border-top: 6px solid #666;
    margin-left: 8px;
    flex-shrink: 0;
    transition: transform 0.25s ease;
  }
  
  .main-nav .nav-menu .has-dropdown.open > a .nav-arrow {
    transform: rotate(180deg);
    border-top-color: #c81623;
  }
  .main-nav .nav-menu .has-dropdown .dropdown {
    position: static;
    opacity: 1;

    visibility: visible;
    min-width: auto;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding: 0 0 8px;
    margin: 0 0 8px 12px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .main-nav .nav-menu .has-dropdown.open .dropdown {
    max-height: 500px;
  }
  .main-nav .nav-menu .dropdown li {
    display: block !important;
  }
  .main-nav .nav-menu .dropdown a {
    padding: 10px 12px;
    font-size: 14px;
    color: #666;
  }
  .nav-search-mobile {
    display: flex;
    flex-direction: row;
    padding: 16px;
    gap: 8px;
    border-top: 1px solid #eee;
    margin-top: 16px;
  }
  .nav-search-mobile .search-input {
    flex: 1;
    min-width: 0;
    box-sizing: border-box;
  }
  .nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
  }
  body.nav-open .nav-overlay {
    opacity: 1;
    visibility: visible;
  }
  body.nav-open {
    overflow: hidden;
  }
}

@media (max-width: 768px) {
  .site-header .top-bar {
    padding: 6px 0;
    font-size: 12px;
  }
  .site-header .top-bar .container {
    justify-content: center;
  }
  .nav-inner {
    padding: 10px 12px;
  }
  .main-nav .logo {
    font-size: 16px;
    max-width: 60%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .main-nav .logo img {
    height: 38px;
  }
  .main-nav .logo .logo-text {
    margin-left: 8px;
    font-size: 14px;
  }
}

@media (max-width: 480px) {
  .main-nav .logo .logo-text {
    font-size: 12px;
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

/* 底部 */
.site-footer {
  background: #2c2c2c;
  color: #bbb;
  padding: 40px 0 0;
  margin-top: 50px;
}
.site-footer .container {
  display: grid;
  grid-template-columns: 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 30px;
  border-bottom: 1px solid #444;
}
@media (max-width: 900px) {
  .site-footer .container {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  .site-footer {
    padding: 24px 0 0;
    margin-top: 32px;
  }
  .site-footer .container {
    gap: 24px;
    padding-bottom: 20px;
  }
  .footer-company {
    font-size: 15px;
  }
  .footer-nav-links {
    gap: 8px 12px;
  }
  .footer-bottom {
    padding: 12px 15px;
    font-size: 11px;
  }
  .footer-bottom .container {
    display: flex;
    flex-direction: column;
    gap: 6px;
  }
}
.footer-intro .footer-logo {
  display: inline-block;
  margin-bottom: 12px;
}
.footer-intro .footer-logo img {
  height: 40px;
  width: auto;
  max-width: 180px;
  object-fit: contain;
  vertical-align: middle;
}
.footer-company {
  font-size: 16px;
  font-weight: bold;
  color: #fff;
  margin-bottom: 10px;
}
.footer-desc {
  font-size: 13px;
  line-height: 1.8;
  color: #999;
}
.site-footer h4 {
  font-size: 14px;
  color: #fff;
  margin-bottom: 12px;
  font-weight: 600;
}
.footer-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}
.footer-nav-links a {
  color: #bbb;
  font-size: 13px;
}
.footer-nav-links a:hover {
  color: #fff;
}
.footer-contact-block p {
  margin: 6px 0;
  font-size: 13px;
}
.footer-contact-block a {
  color: #bbb;
}
.footer-contact-block a:hover {
  color: #c81623;
}
.footer-addresses p {
  margin: 6px 0;
  font-size: 12px;
  color: #999;
  line-height: 1.6;
}
.footer-bottom {
  padding: 16px 0;
  text-align: center;
  font-size: 12px;
  color: #888;
}
.footer-bottom a {
  color: #888;
  margin-right: 12px;
}
.footer-bottom a:hover {
  color: #c81623;
}
.footer-copy {
  color: #666;
}