/* 公共样式 - 头部导航 */

:root {
  /* 主题色 */
  --color-primary: #0b51c8;
  --color-primary-hover: #2d6ae0;
  --color-primary-active: #083ea3;
  --color-primary-light: #e8eefc;
  --color-primary-rgb: 11, 81, 200;

  /* 圆角：按钮统一 */
  --radius-button: 4px;

  /* 文字 */
  --color-text: #2d3a4a;
  --color-text-secondary: #5a6a7a;
  --color-nav: #3d4f63;
  --color-heading: #1e2a38;

  /* 边框 / 背景 */
  --color-border: #e8ecf0;
  --color-bg: #fff;
  --color-bg-muted: #f5f6f8;
  --color-bg-banner: linear-gradient(180deg, #f5f8fc 0%, #eef3f9 55%, #e6edf6 100%);

  /* 布局 */
  --header-height: 72px;
  --banner-height: 600px;
  --container-width: 1400px;
  --font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-size-base: 16px;
  --submenu-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  --transition: 0.25s ease;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: 1.5;
}

body.nav-open {
  overflow: hidden;
}

body.search-open {
  overflow: hidden;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Header ---------- */

.site-header {
  position: relative;
  z-index: 1000;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

/* 向上滚动时固定顶栏，向下滚动时恢复文档流 */
.site-header.is-scroll-pinned {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  border-bottom-color: rgba(232, 236, 240, 0.95);
  box-shadow: 0 2px 16px rgba(30, 42, 56, 0.08);
  animation: site-header-pin-in 0.28s ease;
}

body.is-header-pinned {
  padding-top: var(--header-height);
}

@keyframes site-header-pin-in {
  from {
    transform: translateY(-100%);
  }

  to {
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header.is-scroll-pinned {
    animation: none;
  }
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-width);
  height: var(--header-height);
  margin: 0 auto;
  padding: 0 24px;
}

.site-logo {
  flex-shrink: 0;
}

.site-logo__img {
  width: auto;
  height: 44px;
}

.site-header__right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
  min-width: 0;
  justify-content: flex-end;
}

/* ---------- Nav list ---------- */

.site-nav {
  flex: 1;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: nowrap;
  gap: 2px 0;
}

.nav-item {
  position: relative;
}

.nav-link,
.submenu-link {
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition);
}

.nav-link {
  padding: 10px 12px;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-nav);
  white-space: nowrap;
}

.nav-link:hover,
.submenu-link:hover {
  color: var(--color-primary-hover);
}

.nav-link.is-active,
.submenu-link.is-active {
  color: var(--color-primary);
}

/* ---------- Arrows ---------- */

.nav-arrow {
  flex-shrink: 0;
  width: 0;
  height: 0;
  border-style: solid;
}

.nav-arrow--down {
  margin-top: 2px;
  border-width: 4px 4px 0;
  border-color: currentColor transparent transparent;
}

.nav-arrow--right {
  margin-left: auto;
  border-width: 4px 0 4px 5px;
  border-color: transparent transparent transparent currentColor;
}

/* ---------- Submenu (desktop) ---------- */

.submenu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  padding: 8px 0;
  background: #fff;
  border: 1px solid var(--color-border);
  box-shadow: var(--submenu-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  pointer-events: none;
}

.submenu-l2 {
  z-index: 10;
}

.submenu-l3 {
  top: -8px;
  left: 100%;
  z-index: 20;
}

.submenu > li {
  position: relative;
  border-bottom: 1px solid #f2f4f6;
}

.submenu > li:last-child {
  border-bottom: none;
}

.submenu-link {
  padding: 12px 20px;
  font-size: 14px;
  color: var(--color-nav);
  white-space: nowrap;
}

/* 电脑端：二级、三级菜单 16px + 悬停展开 */
@media (min-width: 1201px) {
  .submenu-link {
    font-size: 16px;
  }

  .nav-item.has-child:hover > .submenu-l2,
  .submenu > li.has-child:hover > .submenu-l3 {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .submenu > li.has-child:hover > .submenu-l3 {
    transform: translateX(0);
  }

  .submenu-l3 {
    transform: translateX(8px);
  }
}

/* ---------- Search ---------- */

.search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  margin-left: 4px;
  color: var(--color-text);
  transition: color var(--transition);
}

.search-btn:hover {
  color: var(--color-primary-hover);
}

/* ---------- Search panel ---------- */

.search-panel {
  position: fixed;
  inset: 0;
  z-index: 1100;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: calc(var(--header-height) + 16px) 16px 24px;
  pointer-events: none;
  visibility: hidden;
  opacity: 0;
  transition: opacity var(--transition), visibility var(--transition);
}

.search-panel.is-open {
  pointer-events: auto;
  visibility: visible;
  opacity: 1;
}

.search-panel__backdrop {
  position: absolute;
  inset: 0;
  border: none;
  padding: 0;
  margin: 0;
  background: rgba(0, 0, 0, 0.45);
  cursor: pointer;
}

.search-panel__dialog {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 720px;
  padding: 16px 20px;
  background: var(--color-bg);
  border-radius: 8px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--color-border);
}

.search-panel__form {
  display: flex;
  flex: 1;
  gap: 10px;
  min-width: 0;
}

.search-panel__input {
  flex: 1;
  min-width: 0;
  padding: 12px 16px;
  font-size: var(--font-size-base);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-button);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.search-panel__input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.2);
}

.search-panel__submit {
  flex-shrink: 0;
  padding: 12px 20px;
  font-size: var(--font-size-base);
  font-weight: 600;
  color: #fff;
  background: var(--color-primary);
  border-radius: var(--radius-button);
  cursor: pointer;
  transition: background var(--transition);
}

.search-panel__submit:hover {
  background: var(--color-primary-hover);
}

.search-panel__close {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-nav);
  border-radius: var(--radius-button);
  transition: color var(--transition), background var(--transition);
}

.search-panel__close:hover {
  color: var(--color-text);
  background: var(--color-bg-muted);
}

@media (max-width: 576px) {
  .search-panel {
    padding: calc(var(--header-height) + 12px) 12px 20px;
  }

  .search-panel__dialog {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 8px;
    padding: 10px 12px 14px;
  }

  /* 关闭在上方右侧，不与输入行重叠 */
  .search-panel__close {
    position: static;
    order: -1;
    align-self: flex-end;
    width: 36px;
    height: 36px;
  }

  .search-panel__close svg {
    width: 18px;
    height: 18px;
  }

  .search-panel__form {
    flex: none;
    width: 100%;
    align-items: stretch;
    gap: 8px;
  }

  /* 输入框与 Search 同高、整体缩小 */
  .search-panel__input,
  .search-panel__submit {
    height: 36px;
    min-height: 36px;
    font-size: 14px;
    line-height: 1.25;
    box-sizing: border-box;
  }

  .search-panel__input {
    padding: 0 10px;
  }

  .search-panel__submit {
    flex: 0 0 auto;
    padding: 0 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

/* ---------- Hamburger ---------- */

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-open .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-open .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

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

.nav-overlay {
  display: none;
}

/* ---------- Tablet & Mobile ---------- */

@media (max-width: 1200px) {
  :root {
    --header-height: 64px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-header__right {
    position: fixed;
    top: var(--header-height);
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    width: min(360px, 88vw);
    padding: 16px 0 32px;
    background: #fff;
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition);
  }

  .nav-open .site-header__right {
    transform: translateX(0);
  }

  /* 蒙层在侧栏下方：与 inner 同层时后出现的会盖住前者，故降低蒙层层级、抬高含侧栏的 inner */
  .nav-open .site-header__inner {
    position: relative;
    z-index: 1002;
  }

  .nav-overlay {
    display: block;
    position: fixed;
    inset: var(--header-height) 0 0 0;
    z-index: 1001;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-link {
    justify-content: space-between;
    padding: 14px 24px;
    font-size: 14px;
  }

  .submenu {
    position: static;
    min-width: 0;
    padding: 0;
    border: none;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .nav-item.is-expanded > .submenu-l2,
  .submenu > li.is-expanded > .submenu-l3 {
    max-height: 800px;
  }

  .submenu-l2 {
    background: #f8f9fb;
  }

  .submenu-l3 {
    background: #f0f2f5;
  }

  .submenu-link {
    padding: 12px 24px 12px 36px;
    font-size: var(--font-size-base);
  }

  .submenu-l3 .submenu-link {
    padding-left: 48px;
  }

  .search-btn {
    margin: 8px 24px 0;
    width: auto;
    height: 44px;
    justify-content: flex-start;
    padding: 0 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-button);
  }
}

@media (max-width: 576px) {
  .site-header__inner {
    padding: 0 16px;
  }

  .site-logo__img {
    height: 36px;
  }
}

/* ---------- Footer ---------- */

.site-footer {
  padding: 56px 0 24px;
  color: #fff;
  background: var(--color-primary);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px 32px;
}

.site-footer__heading {
  margin: 0 0 20px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.3;
  color: #fff;
}

.site-footer__list,
.site-footer__contact-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer__list > li + li {
  margin-top: 4px;
}

.site-footer__link {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  padding: 10px 0;
  font-size: var(--font-size-base, 16px);
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.92);
  transition: color 0.2s ease, opacity 0.2s ease;
}

.site-footer__link:hover {
  color: #fff;
  opacity: 1;
}

.site-footer__chevron {
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  opacity: 0.75;
}

.site-footer__contact-list > li + li {
  margin-top: 16px;
}

.site-footer__contact {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: var(--font-size-base, 16px);
  line-height: 1.55;
  color: rgba(255, 255, 255, 0.92);
}

a.site-footer__contact:hover {
  color: #fff;
}

.site-footer__contact-inline-link {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-footer__contact-inline-link:hover {
  color: #fff;
}

.site-footer__icon {
  flex-shrink: 0;
  display: flex;
  margin-top: 2px;
  color: #fff;
}

.site-footer__icon svg {
  display: block;
}

.site-footer__copyright {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.22);
}

.site-footer__copyright-inner {
  font-size: 14px;
  line-height: 1.6;
  text-align: center;
  color: rgba(255, 255, 255, 0.88);
}

.site-footer__copyright-inner p {
  margin: 0;
}

.site-footer__copyright-inner a {
  color: #fff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.site-footer__copyright-inner a:hover {
  opacity: 0.9;
}

@media (max-width: 992px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer__col--contact {
    grid-column: 1 / -1;
  }
}

@media (max-width: 576px) {
  .site-footer {
    padding: 40px 0 24px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .site-footer__col--contact {
    grid-column: auto;
  }
}

/* ---------- 右侧社媒侧栏（首页等） ---------- */

.site-dock {
  position: fixed;
  top: 50%;
  right: 0;
  z-index: 950;
  transform: translateY(-50%);
}

.site-dock.is-positioned {
  right: auto;
  transform: none;
}

.site-dock.is-dragging {
  user-select: none;
}

.site-dock__drag {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 28px;
  margin: 0;
  padding: 0;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(28, 33, 40, 0.6);
  border: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  cursor: grab;
  touch-action: none;
  transition: background 0.2s ease;
}

.site-dock__drag:hover {
  background: rgba(28, 33, 40, 0.82);
}

.site-dock.is-dragging .site-dock__drag {
  cursor: grabbing;
}

.site-dock__nav,
.site-dock__list,
.site-dock__list li {
  overflow: visible;
}

.site-dock__nav {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

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

.site-dock__item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin: 0;
  padding: 0;
  overflow: visible;
  color: #fff;
  text-decoration: none;
  background: transparent;
  border: none;
  cursor: pointer;
}

.site-dock__item::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  z-index: 0;
  width: 52px;
  height: 52px;
  background: rgba(28, 33, 40, 0.6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: width 0.28s ease, background 0.2s ease;
}

.site-dock__list li:first-child .site-dock__item::before {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.site-dock__item:hover,
.site-dock__item:focus-visible {
  z-index: 2;
  outline: none;
}

.site-dock__item:hover::before,
.site-dock__item:focus-visible::before {
  width: 196px;
  background: rgba(var(--color-primary-rgb), 0.88);
}

.site-dock__label {
  position: absolute;
  top: 0;
  right: 52px;
  z-index: 1;
  display: flex;
  align-items: center;
  width: 0;
  height: 52px;
  margin: 0;
  padding: 0;
  overflow: hidden;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.2;
  white-space: nowrap;
  text-align: left;
  opacity: 0;
  pointer-events: none;
  transition: width 0.28s ease, opacity 0.2s ease, padding 0.28s ease;
}

.site-dock__item:hover .site-dock__label,
.site-dock__item:focus-visible .site-dock__label {
  width: 144px;
  padding: 0 10px 0 16px;
  opacity: 1;
}

.site-dock__icon {
  position: relative;
  z-index: 2;
  display: flex;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
}

.site-dock__icon-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: #1c2128;
  background: #fff;
  border-radius: 50%;
}

.site-dock__icon-badge svg,
.site-dock__icon-badge img {
  display: block;
}

.site-dock__icon-badge img {
  width: 18px;
  height: 18px;
  object-fit: contain;
}

div.site-dock__item {
  cursor: default;
}

.site-dock__icon-badge--alibaba {
  color: var(--color-primary);
}

.site-dock__item--top {
  margin-top: 0;
}

.site-dock__icon-ring {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  color: #fff;
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.9);
  border-radius: 50%;
}

.site-dock__icon-ring svg {
  display: block;
  margin-top: -1px;
}

@media (max-width: 768px) {
  .site-dock {
    display: none;
  }
}

/* ---------- Back to top（全站，非侧栏页） ---------- */

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  color: #fff;
  background: var(--color-primary);
  border: none;
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(var(--color-primary-rgb), 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease,
    background 0.2s ease;
  cursor: pointer;
}

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

.back-to-top:hover {
  background: var(--color-primary-hover);
}

.back-to-top svg {
  display: block;
}

@media (max-width: 576px) {
  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }
}