header {
  background-color: var(--bg-page);
  height: var(--nav-height);
  box-sizing: border-box;
  position: sticky;
  top: 0px;
  left: 0px;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* header styles */
.ks-header {
  --text-color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--nav-bg);
  font-family: var(--font-family);
  z-index: 1000;
}

/* container 行 */
.ks-nav.container {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  height: var(--nav-height);
  box-sizing: border-box;
}

.ks-left {
  display: flex;
  align-items: center;
}

.ks-logo img {
  height: var(--logo-size);
  display: block;
  object-fit: cover;
}

/* 中间主导航 */
.ks-center {
  justify-self: center;
  height: 100%;
}

.ks-menu {
  list-style: none;
  display: flex;
  align-items: center;
  margin: 0;
  padding: 0;
  height: 100%;
  position: sticky;
  top: 0px;
}

.ks-menu-item-wrap {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
  padding: 0 25px;
  border-radius: var(--border-radius);
}

.ks-menu-item-wrap.active {
  background: var(--primary-color);
}

@media (max-width: 1440px) {
  .ks-menu-item-wrap {
    padding: 0 15px;
  }
}

@media (max-width: 1024px) {
  .ks-menu-item-wrap {
    padding: 0 12px;
  }
}

@media (max-width: 992px) {
  .ks-nav.container {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .ks-center {
    display: none;
  }
}

.ks-menu-item-wrap:hover {
  background: var(--primary-color);
}

.ks-menu .ks-menu-item-wrap:hover>.ks-submenu,
.ks-menu .ks-menu-item-wrap:focus-within>.ks-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.ks-menu-item {
  font-family: var(--font-family);
  color: var(--text-color) !important;
  text-decoration: none;
  font-weight: var(--font-sub-title-weight);
  transition: color 0.18s ease, background 0.18s ease;
  font-size: var(--font-content-size);
  text-transform: capitalize;
  height: 100%;
  display: flex;
  align-items: center;
}

/* submenu 基本隐藏状态（桌面）*/
.ks-submenu {
  position: absolute;
  left: 0;
  top: calc(100% + 10px);
  min-width: 270px;
  background: var(--nav-bg);
  border: 1px solid rgba(255, 255, 255, 0.04);
  box-shadow: 0 8px 24px rgba(2, 6, 23, 0.6);
  border-radius: var(--border-radius);
  padding: 16px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
}

/* submenu 项 */
.ks-submenu li {
  padding: 0;
}

.ks-submenu a {
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  font-family: var(--font-family);
  font-size: var(--font-content-size);
}

.ks-submenu a:hover {
  background: var(--primary-color);
  color: var(--text-color);
}

.ks-sub-toggle {
  font-size: 14px;
  display: inline-block;
  background: transparent !important;
  cursor: pointer;
  transition: transform 0.3s ease;
  transform-origin: 50% 50%;
  margin-left: 10px;
}

.has-sub:hover .ks-sub-toggle {
  transform: rotate(-180deg);
}

/* Right Section (Search & Quote button) */

.ks-right,
.ks-actions {
  display: inline-flex;
  align-items: center;
  color: var(--text-color);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.ks-search-btn,
.ks-lang-btn {
  margin-right: 15px;
  position: relative;
  padding-top: 6px;
}

.ks-lang-btn .lang-selector .current-lang {
  display: none;
}

.ks-lang-btn .global-icon {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.ks-lang-btn .global-icon svg path {
  /* fill: var(--text-color); */
  stroke: var(--text-color);
}

.ks-lang-btn .lang-selector {
  width: 24px;
  height: 24px;
}

.lang-selector .lang-box::before {
  right: 8px !important;
}

.ks-quote-btn {
  background-color: var(--second-color);
  color: var(--text-color);
  font-family: var(--font-family);
  padding: 10px 20px;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color 0.3s;
}

.ks-quote-btn:hover {
  color: #000;
  /* Hover effect for button */
}

.ks-hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  cursor: pointer;
  margin-left: 24px;
}

.ks-hamburger span {
  display: block;
  height: 3px;
  background: var(--text-color);
  border-radius: 2px;
}

@media (max-width: 820px) {
  .ks-hamburger {
    display: flex;
  }
}

/* ...existing code... */

/* Mobile menu (ks-mobile-menu) */
:root {
  --nav-height: 120px;
  /* 已在 index.css 中定义，重复仅作保险 */
}

.ks-mobile-menu {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 80;
  background: #fff;
  /* backdrop-filter: blur(100px); */
  padding: 16px;
  box-sizing: border-box;
  overflow-y: auto;
  transform: translateX(-100%);
  opacity: 0;
  /* transition: transform 1s ease; */
  animation: enter 0.5s ease forwards;
  /* , opacity 0.3s ease, visibility 0.3s; */
}

@keyframes enter {
  0% {
    transform: translateX(-100%);
  }

  100% {
    transform: translateX(0%);
  }
}

/* 打开状态 */
.ks-mobile-menu.open {
  opacity: 1;
  transform: translateY(0%);
}

/* 菜单列表 */
.ks-mobile-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* 顶级项 */
.ks-mobile-menu .ks-menu-item {
  display: block;
  padding: 10px 16px;
  color: var(--text-color);
  font-weight: var(--font-sub-title-weight);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  background: transparent;
  width: 100%;
}

/* 有子项的父项视觉 */
.ks-mobile-menu .ks-menu-item-wrap.has-sub>.ks-menu-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

/* 子菜单（折叠式） */
.ks-mobile-menu .ks-mobile-submenu {
  display: none;
  /* Hidden by default */
  height: 0;
  transition: height 0.3s ease;
  /* Smooth transition */
  padding-left: 16px;
  margin-top: 5px;
  list-style: none;
}

/* 展开子菜单 */
.ks-mobile-menu .ks-mobile-submenu[aria-hidden='false'] {
  display: block;
  height: auto;
}

/* 子菜单项 */
.ks-mobile-menu .ks-mobile-submenu li a {
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  font-weight: 500;
  color: var(--text-color);
  border-radius: var(--border-radius);
}

.ks-mobile-menu .ks-mobile-submenu li a:hover {
  background: var(--primary-color);
  color: var(--text-color);
}

/* 子菜单切换按钮（移动内） */
.ks-mobile-menu .ks-mobile-sub-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  background: transparent;
  color: var(--text-color);
  transform-origin: 50% 50% !important;
}

.ks-mobile-menu .ks-mobile-sub-toggle::before {
  display: inline-block;
  transform: rotate(0deg);
  transition: transform 0.18s ease;
}

.ks-mobile-menu .ks-mobile-sub-toggle[aria-expanded='true']::before {
  transform: rotate(180deg);
}

/* 禁止 body 滚动（打开 mobile menu 时） */
body.ks-mobile-open {
  overflow: hidden;
}

/* 在较大屏恢复时隐藏移动菜单样式 */
@media (min-width: 822px) {
  .ks-mobile-menu {
    display: none !important;
  }
}

@media screen and (max-width: 552px) {
  .ks-header {
    --text-color: #000;
  }

  .ks-logo img {
    filter: invert(100%) hue-rotate(180deg) brightness(2.1);
  }
  .ks-quote-btn {
    display: none;
  }

  .ks-hamburger {
    margin-left: 0px;
  }
}