/* ==========================================================================
   NAYITEK Component Stylesheet
   纳易科技企业官网 - 通用组件样式
   ========================================================================== */

/* ==========================================================================
   1. 双层导航系统
   ========================================================================== */

/* --- 顶部栏 (Top Bar) ---
   始终固定在页面顶部，高度48px，深绿背景
   Logo居左 + 搜索居中 + 联系方式居右
   ========================================================================== */
.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1001;
  height: 48px;
  background-color: var(--color-dark);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-slow);
}

.top-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  padding: 0 var(--container-padding);
}

/* Logo区域 */
.top-bar__logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-bar__logo-img-wrap {
  position: relative;
  display: inline-block;
  line-height: 0;
}

.top-bar__logo img {
  height: 28px;
  width: auto;
  display: block;
  transition: filter var(--transition-base), transform var(--transition-base);
}

/*
 * Hover时Logo变品牌绿 #01BF71
 * 方案：SVG feColorMatrix滤镜——唯一能把纯白色精确映射到任意颜色的CSS方案
 * 透明背景完全不受影响（feColorMatrix只处理不透明像素）
 */
.top-bar__logo:hover img {
  filter: url(#logo-recolor-green);
}

.top-bar__logo-text {
  font-family: var(--font-en), var(--font-cn);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-white);
  text-decoration: none;
  letter-spacing: 0.5px;
}

.top-bar__logo-text:hover {
  color: var(--color-primary-light);
}

/* 搜索区域 */
.top-bar__search {
  flex: 1;
  max-width: 320px;
  margin: 0 24px;
  position: relative;
}

.top-bar__search-input {
  width: 100%;
  padding: 6px 12px 6px 36px;
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  color: var(--color-white);
  font-size: 0.8125rem;
  transition: all var(--transition-base);
}

.top-bar__search-input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.top-bar__search-input:focus {
  outline: none;
  background-color: rgba(255, 255, 255, 0.15);
  border-color: var(--color-primary);
}

/* 搜索图标（纯CSS）*/
.top-bar__search::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  pointer-events: none;
}

.top-bar__search::after {
  content: '';
  position: absolute;
  left: 22px;
  top: 50%;
  transform: translateY(-25%) rotate(45deg);
  width: 2px;
  height: 6px;
  background-color: rgba(255, 255, 255, 0.5);
  pointer-events: none;
}

/* 联系方式 */
.top-bar__contact {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 0.8125rem;
}

.top-bar__contact a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color var(--transition-base);
  display: flex;
  align-items: center;
  gap: 4px;
}

.top-bar__contact a:hover {
  color: var(--color-primary-light);
}

.top-bar__tel {
  font-family: var(--font-en), var(--font-cn);
  letter-spacing: 0.3px;
}

/* --- 主导航栏 (Main Navigation) ---
   白色背景，高度64px，位于顶部栏下方
   sticky定位，下滑隐藏
   ========================================================================== */
.main-nav {
  position: fixed;
  top: 48px;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 64px;
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow);
}

.main-nav.is-hidden {
  transform: translateY(-100%);
}

.main-nav.is-scrolled {
  box-shadow: var(--shadow-md);
}

.main-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* 导航菜单 */
.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0;
  width: 100%;
}

/* English按钮推到最右侧（与首页按钮左右对称） */
.nav-menu__item--right {
  margin-left: auto;
}

.nav-menu__item {
  position: relative;
}

.nav-menu__link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 20px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-gray-700);
  text-decoration: none;
  transition: color var(--transition-base);
  white-space: nowrap;
}

.nav-menu__link:hover,
.nav-menu__link.is-active {
  color: var(--color-primary);
}

.nav-menu__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 16px;
  right: 16px;
  height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.nav-menu__link:hover::after,
.nav-menu__link.is-active::after {
  transform: scaleX(1);
}

/* 下拉箭头 */
.nav-menu__arrow {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  margin-left: 2px;
  transition: transform var(--transition-base);
}

.nav-menu__item:hover .nav-menu__arrow,
.nav-menu__item.is-open .nav-menu__arrow {
  transform: rotate(180deg);
}

/* --- 下拉菜单 ---
   hover触发（桌面）/ 点击触发（移动端）
   ========================================================================== */
.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background-color: var(--color-white);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all var(--transition-slow);
  padding: 8px 0;
  z-index: 100;
}

.nav-menu__item:hover > .dropdown,
.nav-menu__item.is-open > .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown__item {
  list-style: none;
  margin: 0;
  padding: 0;
}

.dropdown__link {
  display: block;
  padding: 10px 20px;
  font-size: 0.875rem;
  color: var(--color-gray-600);
  text-decoration: none;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.dropdown__link:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-light);
  padding-left: 24px;
}

/* 多列下拉菜单 */
.dropdown--mega {
  min-width: 480px;
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.dropdown--mega .dropdown__group-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-gray-400);
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 0 20px 8px;
}

/* --- 汉堡菜单按钮（移动端）---
   ========================================================================== */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  padding: 8px;
  cursor: pointer;
  background: none;
  border: none;
  z-index: 1010;
}

.nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-gray-700);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}

.nav-toggle__bar + .nav-toggle__bar {
  margin-top: 5px;
}

/* 汉堡 → X 动画 */
.nav-toggle.is-active .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-active .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-active .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- 移动端侧滑面板 ---
   ========================================================================== */
.mobile-nav {
  display: none;
  position: fixed;
  top: 48px;
  right: 0;
  bottom: 0;
  width: 300px;
  max-width: 85vw;
  background-color: var(--color-white);
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
  overflow-y: auto;
  z-index: 1005;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  padding: 16px 0;
}

.mobile-nav.is-open {
  transform: translateX(0);
}

.mobile-nav__menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav__item {
  border-bottom: 1px solid var(--color-gray-100);
}

.mobile-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-gray-700);
  text-decoration: none;
  transition: color var(--transition-base);
}

.mobile-nav__link:hover,
.mobile-nav__link.is-active {
  color: var(--color-primary);
}

/* 移动端下拉菜单 */
.mobile-nav__submenu {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
  background-color: var(--color-gray-50);
}

.mobile-nav__submenu.is-open {
  max-height: 500px;
}

.mobile-nav__sublink {
  display: block;
  padding: 10px 24px 10px 40px;
  font-size: 0.875rem;
  color: var(--color-gray-600);
  text-decoration: none;
  transition: all var(--transition-base);
}

.mobile-nav__sublink:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-light);
}

/* 遮罩层 */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  top: 48px;
  background-color: rgba(0, 0, 0, 0.4);
  z-index: 1004;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.nav-overlay.is-visible {
  opacity: 1;
}

/* 导航响应式 */
@media (max-width: 1024px) {
  .nav-menu {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .mobile-nav {
    display: block;
  }

  .nav-overlay {
    display: block;
  }

  .top-bar__search {
    display: none;
  }
}

@media (max-width: 480px) {
  .top-bar__contact {
    gap: 10px;
    font-size: 0.75rem;
  }
}

/* ==========================================================================
   搜索结果浮层 (Pagefind)
   ========================================================================== */
.pagefind-results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  min-width: 360px;
  max-height: 420px;
  overflow-y: auto;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  padding: 6px 0;
}
.pagefind-results::-webkit-scrollbar { width: 4px; }
.pagefind-results::-webkit-scrollbar-thumb { background: #D1D5DB; border-radius: 4px; }

.pagefind-results__empty {
  padding: 20px 16px;
  text-align: center;
  color: #9CA3AF;
  font-size: 0.875rem;
}

.pagefind-results__item {
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  transition: background 0.15s;
  border-bottom: 1px solid #F3F4F6;
}
.pagefind-results__item:last-child { border-bottom: none; }
.pagefind-results__item:hover { background: #F0FDF4; }

.pagefind-results__title {
  font-size: 0.875rem;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 3px;
  line-height: 1.4;
}
.pagefind-results__item:hover .pagefind-results__title { color: #01BF71; }

.pagefind-results__excerpt {
  font-size: 0.8125rem;
  color: #6B7280;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.pagefind-results__excerpt mark {
  background: none;
  color: #01BF71;
  font-weight: 600;
}

/* ==========================================================================
   2. 页脚 (Footer)
   四列布局：公司信息 | 产品矩阵 | 联系方式 | 关注我们
   ========================================================================== */

.footer {
  background-color: var(--color-dark);
  color: var(--color-white);
  padding: 64px 0 0;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

/* 页脚列通用 */
.footer__col-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-white);
  font-family: var(--font-en), var(--font-cn);
}

/* 页脚Logo图片 */
.footer__logo-img {
  height: 50px;
  width: auto;
  margin-bottom: 16px;
  transition: opacity var(--transition-base);
}

.footer__logo-wrap {
  position: relative;
  display: inline-block;
}

.footer__logo-reg {
  position: absolute;
  top: -2px;
  right: -12px;
  font-size: 16px;
  color: var(--color-gray-400);
  line-height: 1;
}

/*
 * 页脚Logo hover变品牌绿 #01BF71
 * 与顶部栏Logo共用同一个SVG滤镜
 */
.footer__logo-img:hover,
.footer__logo-wrap:hover .footer__logo-img,
a:hover .footer__logo-wrap .footer__logo-img {
  filter: url(#logo-recolor-green);
}

/* 公司信息列 */
.footer__brand-desc {
  font-size: 0.875rem;
  color: var(--color-gray-400);
  line-height: 1.8;
  margin-bottom: 20px;
}

.footer__social {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 微信公众号二维码 */
.footer__wechat-link {
  display: inline-block;
  padding: 4px;
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.footer__wechat-link:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(1, 191, 113, 0.2);
}

.footer__wechat-qr {
  width: 100px;
  height: 100px;
  display: block;
}
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--color-white);
  text-decoration: none;
  transition: all var(--transition-base);
}

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

/* 链接列 */
.footer__links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer__links li {
  margin-bottom: 10px;
}

.footer__links a {
  font-size: 0.875rem;
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color var(--transition-base);
}

.footer__links a:hover {
  color: var(--color-primary-light);
}

/* 联系信息 */
.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.875rem;
  color: var(--color-gray-400);
}

.footer__contact-icon {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 2px;
  opacity: 0.7;
}

/* 底部版权栏 */
.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.8125rem;
  color: var(--color-gray-500);
  text-align: center;
}

.footer__bottom-links {
  display: flex;
  align-items: center;
  gap: 20px;
}

.footer__bottom-links a {
  color: var(--color-gray-500);
  text-decoration: none;
  transition: color var(--transition-base);
}

.footer__bottom-links a:hover {
  color: var(--color-primary-light);
}

/* 页脚响应式 */
@media (max-width: 1024px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

.footer__icp a {
  color: var(--color-gray-500);
  text-decoration: none;
  transition: color var(--transition-base);
}
.footer__icp a:hover {
  color: #fff;
}

@media (max-width: 768px) {
  .footer {
    padding: 48px 0 0;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer__bottom {
    gap: 12px;
  }
}

/* ==========================================================================
   3. 侧边导航 (Side Navigation)
   左侧固定，sticky定位
   支持锚点模式和页面跳转模式
   ========================================================================== */

.side-nav {
  position: sticky;
  top: calc(48px + 64px + 24px); /* top-bar + main-nav + gap */
  flex-shrink: 0;
  width: 220px;
  max-height: calc(100vh - 48px - 64px - 48px);
  overflow-y: auto;
  padding: 24px 0;
}

/* 自定义滚动条 */
.side-nav::-webkit-scrollbar {
  width: 3px;
}

.side-nav::-webkit-scrollbar-track {
  background: transparent;
}

.side-nav::-webkit-scrollbar-thumb {
  background-color: var(--color-gray-300);
  border-radius: 3px;
}

.side-nav::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-gray-400);
}

.side-nav__title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-gray-400);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 0 16px;
  margin-bottom: 12px;
}

.side-nav__menu {
  list-style: none;
  margin: 0;
  padding: 0;
}

.side-nav__item {
  margin-bottom: 2px;
}

.side-nav__link {
  display: block;
  padding: 8px 16px;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-gray-500);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all var(--transition-base);
  line-height: 1.5;
}

.side-nav__link:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-light);
}

/* 当前激活项 */
.side-nav__link.is-active {
  color: var(--color-primary);
  font-weight: 600;
  border-left-color: var(--color-primary);
  background-color: var(--color-bg-light);
}

/* 子菜单 */
.side-nav__submenu {
  list-style: none;
  margin: 0;
  padding: 0 0 0 16px;
}

.side-nav__sublink {
  display: block;
  padding: 6px 16px;
  font-size: 0.8125rem;
  color: var(--color-gray-400);
  text-decoration: none;
  transition: all var(--transition-base);
}

.side-nav__sublink:hover {
  color: var(--color-primary);
}

.side-nav__sublink.is-active {
  color: var(--color-primary);
  font-weight: 500;
}

/* 侧边导航响应式 */
@media (max-width: 1024px) {
  .side-nav {
    display: none;
  }

  /* 移动端侧边导航可以改为水平滚动或折叠 */
  .side-nav--mobile {
    display: block;
    position: relative;
    top: auto;
    width: 100%;
    max-height: none;
    padding: 16px 0;
    border-bottom: 1px solid var(--color-gray-200);
  }

  .side-nav--mobile .side-nav__menu {
    display: flex;
    overflow-x: auto;
    gap: 0;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .side-nav--mobile .side-nav__menu::-webkit-scrollbar {
    display: none;
  }

  .side-nav--mobile .side-nav__item {
    flex-shrink: 0;
    margin-bottom: 0;
  }

  .side-nav--mobile .side-nav__link {
    padding: 8px 16px;
    border-left: none;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
  }

  .side-nav--mobile .side-nav__link.is-active {
    border-left-color: transparent;
    border-bottom-color: var(--color-primary);
  }

  .side-nav--mobile .side-nav__submenu {
    display: none;
  }
}

/* ==========================================================================
   4. 动画类
   使用 Intersection Observer 配合 .animate 类触发
   ========================================================================== */

/* 通用动画基类 - 默认可见（渐进增强：无JS时内容仍可见） */
.animate {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

/* JS加载后通过 <html class="js"> 切换为动画模式 */
.js .animate {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

/* 进入视口时的激活状态 */
.animate.active {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* 渐入 */
.animate--fade {
  opacity: 1;
  transition: opacity 0.6s ease;
}

.js .animate--fade {
  opacity: 0;
  transition: opacity 0.6s ease;
}

.animate--fade.active {
  opacity: 1 !important;
}

/* 从下方滑入 */
.animate--slide-up {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .animate--slide-up {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate--slide-up.active {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* 从左侧滑入 */
.animate--slide-left {
  opacity: 1;
  transform: translateX(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .animate--slide-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate--slide-left.active {
  opacity: 1 !important;
  transform: translateX(0) !important;
}

/* 从右侧滑入 */
.animate--slide-right {
  opacity: 1;
  transform: translateX(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .animate--slide-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate--slide-right.active {
  opacity: 1 !important;
  transform: translateX(0) !important;
}

/* 缩放 */
.animate--scale {
  opacity: 1;
  transform: scale(1);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .animate--scale {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate--scale.active {
  opacity: 1 !important;
  transform: scale(1) !important;
}

/* 动画延迟 */
.animate--delay-1 { transition-delay: 0.1s; }
.animate--delay-2 { transition-delay: 0.2s; }
.animate--delay-3 { transition-delay: 0.3s; }
.animate--delay-4 { transition-delay: 0.4s; }
.animate--delay-5 { transition-delay: 0.5s; }

/* 数字递增动画容器 */
.counter {
  font-family: var(--font-en), var(--font-cn);
  font-weight: 700;
  font-size: 2.5rem;
  color: var(--color-primary);
  line-height: 1;
}

.counter__suffix {
  font-size: 1.5rem;
  font-weight: 600;
  margin-left: 2px;
}

/* ==========================================================================
   5. 侧边导航布局容器
   用于包含侧边导航的页面布局
   ========================================================================== */

.layout-with-sidebar {
  display: flex;
  gap: 40px;
  align-items: flex-start;
}

.layout-with-sidebar__main {
  flex: 1;
  min-width: 0;
}

.layout-with-sidebar__sidebar {
  flex-shrink: 0;
  width: 220px;
  align-self: stretch;
}

@media (max-width: 1024px) {
  .layout-with-sidebar {
    flex-direction: column;
    gap: 0;
  }

  .layout-with-sidebar__sidebar {
    width: 100%;
  }
}

/* ==========================================================================
   6. 页面主体内容区占位
   确保内容不被固定导航遮挡
   ========================================================================== */

.page-content {
  padding-top: calc(48px + 64px); /* top-bar + main-nav */
}

/* ==========================================================================
   7. 搜索模态框 / 搜索结果
   ========================================================================== */

.search-overlay {
  position: fixed;
  inset: 0;
  z-index: 2000;
  background-color: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-slow);
}

.search-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.search-overlay__box {
  width: 100%;
  max-width: 640px;
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transform: translateY(-20px) scale(0.95);
  transition: transform var(--transition-slow);
}

.search-overlay.is-open .search-overlay__box {
  transform: translateY(0) scale(1);
}

.search-overlay__input {
  width: 100%;
  padding: 20px 24px;
  font-size: 1.125rem;
  border: none;
  outline: none;
  background: transparent;
  color: var(--color-gray-800);
}

.search-overlay__results {
  border-top: 1px solid var(--color-gray-200);
  max-height: 400px;
  overflow-y: auto;
}

.search-overlay__result-item {
  display: block;
  padding: 14px 24px;
  color: var(--color-gray-700);
  text-decoration: none;
  transition: background-color var(--transition-base);
  border-bottom: 1px solid var(--color-gray-100);
}

.search-overlay__result-item:hover {
  background-color: var(--color-bg-light);
  color: var(--color-primary);
}

/* ==========================================================================
   8. 回到顶部按钮
   ========================================================================== */

.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  width: 44px;
  height: 44px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-slow);
}

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

.back-to-top:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* 箭头图标（纯CSS）*/
.back-to-top::before {
  content: '';
  display: block;
  width: 10px;
  height: 10px;
  border-left: 2px solid var(--color-white);
  border-top: 2px solid var(--color-white);
  transform: translateY(3px) rotate(45deg);
}

/* ==========================================================================
   9. 表单提交 Toast 提示
   ========================================================================== */

.form-toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: #fff;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  max-width: 90vw;
  text-align: center;
}
.form-toast.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.form-toast--success {
  background: #059669;
}
.form-toast--error {
  background: #DC2626;
}