/* ========================================
   头部导航样式
======================================== */

:root {
  --zs-header-offset: 4.9rem;
}

body > main > *:first-child {
  margin-top: var(--zs-header-offset);
}

/* 导航容器 */
.zs-nav-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1010;
  background: var(--zs-white);
  box-shadow: 0 2px 10px -2px rgba(0, 0, 0, 0.1);
}

.zs-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  padding: 0.8rem 2rem;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

/* Logo区域 */
.zs-nav-logo {
  display: flex;
  align-items: center;
}

.zs-nav-logo a {
  display: flex;
  align-items: center;
}

.zs-nav-logo img {
  height: 2.5rem;
  width: auto;
}

/* 导航菜单 */
.zs-nav-menu {
  display: flex;
  align-items: center;
  gap: 0;
}

.zs-nav-menu > li {
  position: relative;
}

.zs-nav-menu > li > a {
  display: block;
  padding: 1rem 2rem;
  font-size: 1.2em;
  font-weight: 700;
  color: var(--zs-primary);
  transition: color 0.3s ease;
}

.zs-nav-menu > li > a:hover {
  color: var(--zs-secondary);
}

/* 下拉菜单触发器 */
.zs-nav-dropdown {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.zs-nav-dropdown-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 0.5rem;
  height: 0.8rem;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.zs-nav-dropdown-arrow svg {
  width: 0.5rem;
  height: 0.8rem;
  max-width: 0.5rem;
  max-height: 0.8rem;
  display: block;
  overflow: visible;
}

.zs-nav-dropdown-arrow svg polyline,
.zs-nav-dropdown-arrow svg .cls-1 {
  fill: none;
  stroke: var(--zs-primary);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2px;
}

/* 下拉菜单 */
.zs-nav-submenu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--zs-white);
  border-radius: 0 0 10px 10px;
  box-shadow: 0 5px 15px -5px rgba(0, 0, 0, 0.1);
  padding: 1rem 0;
  min-width: 180px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.zs-nav-menu > li:hover .zs-nav-submenu {
  opacity: 1;
  visibility: visible;
}

.zs-nav-menu > li:hover .zs-nav-dropdown-arrow {
  transform: rotate(90deg);
}

.zs-nav-menu > li:hover .zs-nav-dropdown-arrow svg polyline,
.zs-nav-menu > li:hover .zs-nav-dropdown-arrow svg .cls-1 {
  stroke: var(--zs-secondary);
}

.zs-nav-submenu a {
  display: block;
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  color: var(--zs-primary);
  transition: all 0.3s ease;
}

.zs-nav-submenu a:hover {
  background: var(--zs-bg-light);
  color: var(--zs-secondary);
}

/* 右侧工具栏 */
.zs-nav-tools {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.zs-nav-tool {
  position: relative;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.zs-nav-tool:hover {
  transform: scale(1.05);
}

.zs-nav-tool img {
  width: 1.5rem;
  height: 1.5rem;
}

/* 购物车数量 */
.zs-nav-cart-count {
  position: absolute;
  top: -0.5rem;
  right: -0.5rem;
  width: 1.2rem;
  height: 1.2rem;
  background: var(--zs-primary);
  color: var(--zs-white);
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  border: 2px solid var(--zs-white);
}

/* 搜索按钮 */
.zs-nav-search-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 3rem;
  height: 3rem;
  border: 1px solid var(--zs-primary);
  border-radius: 50%;
  transition: all 0.3s ease;
}

.zs-nav-search-btn:hover {
  background: var(--zs-secondary);
  border-color: var(--zs-secondary);
}

.zs-nav-search-btn:hover img {
  filter: brightness(0) invert(1);
}

.zs-nav-search-btn img {
  width: 1.2rem;
  height: 1.2rem;
}

/* 账户下拉菜单 */
.zs-account-dropdown {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--zs-light-gray);
  border-radius: 15px;
  padding: 1.5rem;
  min-width: 200px;
  border: 1px solid var(--zs-primary);
  box-shadow: 0 5px 15px -5px rgba(0, 0, 0, 0.1);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.zs-nav-tool:hover .zs-account-dropdown {
  opacity: 1;
  visibility: visible;
}

.zs-account-dropdown > div {
  position: relative;
}

.zs-account-dropdown > div + div {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--zs-border);
}

.zs-account-dropdown .zs-btn {
  width: 100%;
  display: block;
}

.zs-account-dropdown p {
  font-size: 0.9rem;
  color: var(--zs-gray);
  margin-bottom: 0.5rem;
}

/* 语言选择 */
.zs-nav-lang {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  overflow: hidden;
}

.zs-nav-lang img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 移动端菜单按钮 */
.zs-nav-burger {
  display: none;
  cursor: pointer;
  position: relative;
  width: 2.8rem;
  height: 2.8rem;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(17, 51, 102, 0.16);
  background: var(--zs-white);
  transition: border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
}

.zs-nav-burger span {
  display: none;
}

.zs-nav-burger::before,
.zs-nav-burger::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 1.1rem;
  height: 2px;
  border-radius: 999px;
  background: var(--zs-primary);
  transform: translateX(-50%);
  transition: transform 0.25s ease, top 0.25s ease, bottom 0.25s ease, opacity 0.25s ease, background 0.25s ease;
}

.zs-nav-burger::before {
  top: 0.95rem;
  box-shadow: 0 0.35rem 0 var(--zs-primary);
}

.zs-nav-burger::after {
  bottom: 0.95rem;
}

.zs-nav-burger:hover {
  border-color: rgba(27, 154, 170, 0.38);
  box-shadow: 0 10px 20px -18px rgba(17, 51, 102, 0.32);
}

.zs-nav-burger.active {
  background: rgba(27, 154, 170, 0.08);
  border-color: rgba(27, 154, 170, 0.42);
}

.zs-nav-burger.active::before {
  top: 50%;
  box-shadow: none;
  transform: translateX(-50%) translateY(-50%) rotate(45deg);
  background: var(--zs-secondary);
}

.zs-nav-burger.active::after {
  bottom: 50%;
  transform: translateX(-50%) translateY(50%) rotate(-45deg);
  background: var(--zs-secondary);
}

/* 搜索栏展开 */
.zs-nav-searchbar {
  position: absolute;
  left: 50%;
  transform: translateX(-50%) translateY(-0.5rem);
  width: min(100%, calc(1400px - 4rem));
  top: 100%;
  background: transparent;
  padding: 0.75rem 0 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
}

.zs-nav-searchbar.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.zs-nav-searchbar-form {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 0.9rem 0.75rem 1.05rem;
  background: var(--zs-white);
  border: 1px solid rgba(17, 51, 102, 0.12);
  border-radius: 14px;
  box-shadow: 0 14px 34px -24px rgba(17, 51, 102, 0.28);
}

.zs-nav-searchbar-icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.zs-nav-searchbar-icon img {
  width: 1.5rem;
  height: 1.5rem;
}

.zs-nav-searchbar-field {
  flex: 1;
  min-width: 0;
}

.zs-nav-searchbar-field input {
  width: 100%;
  min-width: 0;
  height: 2.85rem;
  padding: 0 1rem;
  border: 1px solid #2ba9bf;
  border-radius: 12px;
  font-size: 0.98rem;
  color: var(--zs-primary);
  background: #fff;
}

.zs-nav-searchbar-field input:focus {
  outline: none;
  border-color: var(--zs-secondary);
  box-shadow: 0 0 0 3px rgba(27, 154, 170, 0.14);
}

.zs-nav-searchbar-field input::placeholder {
  color: #8b9bb1;
}

.zs-nav-searchbar-form .zs-btn {
  min-width: 5.5rem;
  min-height: 2.85rem;
}

/* 响应式 */
@media (max-width: 1200px) {
  .zs-nav-menu > li > a {
    padding: 1rem 1.5rem;
  }
}

@media (max-width: 1024px) {
  .zs-nav-menu {
    display: none;
  }

  .zs-nav-tools {
    display: flex;
    margin-left: auto;
    margin-right: 0.75rem;
    gap: 0;
  }

  .zs-nav-tool,
  .zs-nav-lang {
    display: none;
  }

  .zs-nav-search-btn {
    width: 2.8rem;
    height: 2.8rem;
  }

  .zs-nav-burger {
    display: block;
    flex-shrink: 0;
  }

  .zs-nav-menu.active {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    position: absolute;
    top: calc(100% + 0.65rem);
    left: 1rem;
    right: 1rem;
    background: var(--zs-white);
    border: 1px solid rgba(17, 51, 102, 0.08);
    border-radius: 18px;
    box-shadow: 0 24px 40px -30px rgba(17, 51, 102, 0.34);
    padding: 0.65rem 0;
    z-index: 1015;
    max-height: calc(100vh - 6.5rem);
    overflow-y: auto;
  }

  .zs-nav-menu.active > li + li {
    border-top: 1px solid rgba(17, 51, 102, 0.08);
  }

  .zs-nav-menu.active > li {
    width: 100%;
  }

  .zs-nav-menu.active > li > a {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    width: 100%;
    box-sizing: border-box;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    text-align: left;
  }

  .zs-nav-menu.active .zs-nav-dropdown {
    width: 100%;
    justify-content: space-between;
  }

  .zs-nav-submenu {
    position: static;
    transform: none;
    box-shadow: none;
    padding: 0.2rem 1.25rem 0.85rem;
    margin-top: -0.15rem;
    opacity: 1;
    visibility: visible;
    display: none;
    border-radius: 0;
    min-width: 0;
    background: transparent;
  }

  .zs-nav-menu > li.active .zs-nav-submenu {
    display: block;
  }

  .zs-nav-menu > li.active .zs-nav-dropdown-arrow {
    transform: rotate(90deg);
  }

  .zs-nav-submenu a {
    padding: 0.75rem 0.9rem;
    border-radius: 12px;
    font-size: 0.95rem;
    color: #4f607e;
  }

  .zs-nav-submenu a:hover,
  .zs-nav-submenu a.active {
    background: #f4f8fb;
    color: var(--zs-primary);
  }

  .zs-nav-searchbar {
    width: calc(100% - 2rem);
  }
}

@media (max-width: 768px) {
  :root {
    --zs-header-offset: 4.1rem;
  }

  .zs-nav {
    padding: 0.6rem 1rem;
  }

  .zs-nav-logo img {
    height: 2rem;
  }

  .zs-nav-search-btn,
  .zs-nav-burger {
    width: 2.65rem;
    height: 2.65rem;
  }

  .zs-nav-searchbar {
    width: calc(100% - 1rem);
    padding-top: 0.5rem;
  }

  .zs-nav-searchbar-form {
    gap: 0.7rem;
    padding: 0.7rem;
  }

  .zs-nav-searchbar-field input {
    height: 2.65rem;
    padding: 0 0.85rem;
    font-size: 0.92rem;
  }

  .zs-nav-searchbar-form .zs-btn {
    min-width: 4.8rem;
    min-height: 2.65rem;
    padding: 0.65rem 1rem;
  }
}

@media (max-width: 480px) {
  .zs-nav-menu.active > li > a {
    padding: 0.9rem 1rem;
  }

  .zs-nav-submenu {
    padding: 0.15rem 1rem 0.75rem;
  }

  .zs-nav-searchbar {
    width: calc(100% - 0.75rem);
  }

  .zs-nav-searchbar-form {
    flex-wrap: wrap;
  }

  .zs-nav-searchbar-icon {
    align-self: center;
  }

  .zs-nav-searchbar-field {
    width: calc(100% - 2.2rem);
  }

  .zs-nav-searchbar-form .zs-btn {
    width: 100%;
  }
}