/* ============================================================
 * 布局 —— 公共头部 / 导航 / 页脚 / 栅格
 * 头部与页脚由 nav.js 统一注入，class 名与 JS 模板保持一致
 * ============================================================ */

/* ===================== 头部 ===================== */
.site-header {
  position: relative;
  z-index: var(--z-header);
  background: var(--color-bg);
  box-shadow: none;
  border-bottom: 1px solid var(--color-border);
  padding-top: env(safe-area-inset-top, 0px);
}

/* ---- 上栏：品牌色底 + Logo ---- */
.site-header__brand {
  position: relative;
  background: var(--color-primary);
  height: 134px;
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
  isolation: isolate;
}

.site-header__brand-inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  height: 134px;
  min-height: 134px;
  padding-top: 0;
  padding-bottom: 0;
}

.site-header__brand-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  gap: 10px;
  flex: 0 1 auto;
  min-width: 0;
}

.site-header__utils {
  display: none;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0;
  font-size: 15px;
  line-height: 1.4;
}

.site-header__util {
  color: #fff;
  padding: 2px 0;
  white-space: nowrap;
}

.site-header__util:hover {
  color: rgba(255, 255, 255, 0.85);
}

.site-header__util-sep {
  color: rgba(255, 255, 255, 0.55);
  margin: 0 12px;
  user-select: none;
}

/* ---- Logo：叠在红弧背景上层（原站 .logo margin-top:10px） ---- */
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  isolation: isolate;
  margin-top: 10px;
  align-self: flex-start;
}

.site-logo__img {
  height: 112px;
  width: auto;
  max-width: min(100%, 510px);
  display: block;
  flex-shrink: 0;
  background: transparent;
  padding: 0;
  border-radius: 0;
  object-fit: contain;
}

/* ---- 下栏：主导航 ---- */
.site-header__nav {
  display: none;
  background: var(--color-bg);
}

.site-header__nav-inner {
  display: flex;
  align-items: center;
  min-height: 64px;
  padding: 4px 0;
}

/* ---- 站内搜索 ---- */
.site-search-wrap {
  flex: 0 0 auto;
  flex-shrink: 0;
  min-width: 0;
}

.site-search {
  display: flex;
  align-items: center;
  border: 1px solid #d8dde3;
  border-radius: var(--radius-pill);
  overflow: hidden;
  background: #fff;
  height: 38px;
  width: 220px;
  max-width: 100%;
  padding: 0;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

/* 头部品牌区搜索：方框 + 主色按钮 */
.site-search--brand {
  border-radius: 2px;
  width: 280px;
  max-width: 100%;
  height: 40px;
}

.site-search--brand .site-search__btn {
  border-radius: 0;
  width: 44px;
  height: 40px;
  background: var(--color-primary-dark);
}

.site-search--brand .site-search__btn:hover {
  background: var(--color-primary-dark);
  filter: brightness(0.9);
}

.site-search--brand:focus-within {
  box-shadow: none;
  border-color: #c8ced6;
}

.site-search:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-border);
}

.site-search__input {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  padding: 6px 12px;
  font-size: 13px;
  background: transparent;
  color: var(--color-text);
}

.site-search__input::placeholder {
  color: var(--color-text-muted);
}

.site-search__btn {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 0;
  align-self: stretch;
  background: var(--color-primary);
  color: #fff;
  transition: background var(--transition-fast);
}

.site-search__btn:hover {
  background: var(--color-primary-dark);
  color: #fff;
}

.site-search__btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.site-logo__icon {
  width: 38px;
  height: 38px;
  flex-shrink: 0;
}

.site-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.site-logo__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-heading);
  white-space: nowrap;
}

.site-logo__sub {
  font-size: 11px;
  color: var(--color-text-muted);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

/* ---- 桌面导航 ---- */
.site-nav {
  display: none; /* 移动端默认隐藏，由汉堡菜单接管 */
}

.site-nav__list {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 100%;
  justify-content: space-between;
  gap: 0;
  flex-wrap: nowrap;
}

.site-nav__item {
  position: relative;
  flex: 1 1 0;
  min-width: 0;
  text-align: center;
}

.site-nav__link {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: 16px 8px;
  height: auto;
  min-height: 0;
  line-height: 1.25;
  color: var(--color-heading);
  font-size: 15px;
  font-weight: 700;
  white-space: nowrap;
  border-radius: 0;
  transition: color var(--transition-fast);
}

.site-nav__link:hover,
.site-nav__item.is-active > .site-nav__link {
  color: var(--color-primary);
  background: transparent;
}

.site-nav__caret {
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--transition-fast);
}

/* 下拉菜单 */
.site-nav__dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translate(-50%, 8px);
  width: max-content;
  min-width: 140px;
  background: var(--color-bg);
  box-shadow: var(--shadow-md);
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  padding: var(--space-sm) 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), transform var(--transition-fast),
    visibility var(--transition-fast);
  z-index: var(--z-dropdown);
}

.site-nav__item:hover > .site-nav__dropdown,
.site-nav__item:focus-within > .site-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.site-nav__dropdown a {
  display: block;
  padding: 10px 18px;
  font-size: 14px;
  color: var(--color-text);
  white-space: nowrap;
}

.site-nav__dropdown a:hover,
.site-nav__dropdown a.is-active {
  color: var(--color-primary);
  background: var(--color-primary-bg);
}

/* 下拉菜单中的分组入口与其他二级导航保持相同字重 */
.site-nav__group-link {
  font-weight: 400;
  color: var(--color-text);
}

.site-nav__group-link:not(:first-child) {
  margin-top: 4px;
  border-top: 1px solid var(--color-border);
}

/* 分组下的二级项缩进 */
.site-nav__item--grouped a {
  padding-left: 28px;
}

/* ---- 汉堡按钮（移动端） ---- */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
  width: 56px;
  height: 56px;
  padding: 12px;
  border-radius: var(--radius-sm);
  /* 扩大可点区域，避免贴边难点 */
  touch-action: manipulation;
}

.nav-toggle__bar {
  display: block;
  height: 3px;
  width: 100%;
  background: var(--color-heading);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

body.menu-open .nav-toggle__bar:nth-child(1) {
  transform: translateY(10px) rotate(45deg);
}

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

body.menu-open .nav-toggle__bar:nth-child(3) {
  transform: translateY(-10px) rotate(-45deg);
}

/* ---- 移动端全屏菜单 ---- */
.mobile-menu {
  position: fixed;
  /* 打开时贴在当前页头下方（页头不吸顶，通常从顶部打开菜单） */
  inset: calc(var(--header-height-mobile) + env(safe-area-inset-top, 0px)) 0 0 0;
  background: var(--color-bg);
  z-index: var(--z-mobile-menu);
  overflow-y: auto;
  padding: var(--space-md);
  padding-bottom: calc(var(--space-md) + env(safe-area-inset-bottom, 0px));
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  visibility: hidden;
}

body.menu-open .mobile-menu {
  transform: translateX(0);
  visibility: visible;
}

body.menu-open {
  overflow: hidden;
}

.mobile-menu__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 14px var(--space-sm);
  font-size: var(--fs-md);
  font-weight: 500;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
}

.mobile-menu__link.is-active {
  color: var(--color-primary);
}

.mobile-menu__group .mobile-menu__link::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform var(--transition-fast);
}

.mobile-menu__group.is-open > .mobile-menu__link::after {
  transform: rotate(-135deg);
}

.mobile-menu__sub {
  display: none;
  background: var(--color-bg-gray);
  border-radius: var(--radius-md);
  margin: var(--space-sm) 0;
}

.mobile-menu__group.is-open > .mobile-menu__sub {
  display: block;
}

.mobile-menu__sub a {
  display: block;
  padding: 12px var(--space-lg);
  font-size: 15px;
  color: var(--color-text-secondary);
}

.mobile-menu__sub a.is-active {
  color: var(--color-primary);
  font-weight: 500;
}

.mobile-menu__group-link {
  display: block;
  padding: 12px var(--space-lg);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
}

.mobile-menu__link--grouped {
  padding-left: var(--space-xl);
}

/* 汉堡菜单底部搜索：默认隐藏，<1024px 显示（与桌面导航同断点） */
.mobile-menu__search {
  display: none;
  margin-top: var(--space-lg);
  margin-left: 0;
  padding: var(--space-md) var(--space-sm) var(--space-sm);
  border-top: 1px solid var(--color-border);
  width: 100%;
  max-width: none;
  flex: none;
}

.mobile-menu__utils {
  margin-top: var(--space-md);
  padding: var(--space-sm) 0;
  border-top: 1px solid var(--color-border);
}

.mobile-menu__utils .mobile-menu__link {
  color: var(--color-primary);
}

.mobile-menu__search .site-search {
  width: 100%;
  max-width: none;
}

/* ===================== 页脚 ===================== */
.site-footer {
  background: var(--color-bg-dark);
  color: rgba(255, 255, 255, 0.75);
  font-size: var(--fs-sm);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  padding: var(--space-xl) 0;
}

.site-footer__title {
  color: #fff;
  font-size: var(--fs-md);
  margin-bottom: var(--space-md);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.site-footer__links li {
  margin: 0;
}

.site-footer__links a {
  color: rgba(255, 255, 255, 0.75);
}

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

.site-footer__contact li {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: 10px;
  line-height: 1.6;
}

.site-footer__contact a {
  color: inherit;
}

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

.site-footer__contact .icon {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 4px;
  fill: var(--color-accent);
}

.site-footer__qrs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  position: relative;
  z-index: 2;
}

.site-footer__qr {
  margin: 0;
  text-align: center;
  position: relative;
  z-index: 1;
  outline: none;
}

.site-footer__qr:hover,
.site-footer__qr:focus-within {
  z-index: 50;
}

.site-footer__qr img {
  width: 72px;
  height: 72px;
  object-fit: contain;
  background: #fff;
  padding: 4px;
  border-radius: var(--radius-sm);
  display: block;
  cursor: zoom-in;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
  transform-origin: bottom center;
  will-change: transform;
}

.site-footer__qr:first-child img {
  transform-origin: bottom left;
}

.site-footer__qr:last-child img {
  transform-origin: bottom right;
}

.site-footer__qr:hover img,
.site-footer__qr:focus-within img {
  transform: scale(2.9);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
}

.site-footer__qr figcaption {
  margin-top: 6px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
}

@media (hover: none) {
  .site-footer__qr img {
    width: 76px;
    height: 76px;
  }

  .site-footer__qr:focus-within img {
    transform: scale(2.4);
  }
}

/* 底栏：版权与备案同一行 */
.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: var(--space-md) 0 calc(var(--space-md) + 4px);
  display: flex;
  justify-content: center;
  text-align: center;
  font-size: var(--fs-xs);
  color: rgba(255, 255, 255, 0.5);
}

.site-footer__meta {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 6px 10px;
  line-height: 1.6;
}

.site-footer__sep {
  opacity: 0.45;
  user-select: none;
}

.site-footer__bottom a {
  color: inherit;
  text-decoration: none;
}

.site-footer__bottom a:hover {
  color: rgba(255, 255, 255, 0.85);
}

/* ===================== 栅格 ===================== */
.grid {
  display: grid;
  gap: var(--space-lg);
}

/* 栅格子项默认最小宽度为 0，避免 nowrap 内容撑破列宽导致整行溢出 */
.grid > * {
  min-width: 0;
}

/* ===================== 响应式 ===================== */

/* <1024px：顶栏隐藏搜索（与桌面导航同断点），放入汉堡菜单；汉堡按钮靠右 */
/* <1024px：顶栏隐藏搜索与快捷入口，汉堡菜单靠右 */
@media (max-width: 1023px) {
  .site-header__brand-inner > .site-search-wrap,
  .site-header__brand-right > .site-search-wrap {
    display: none;
  }

  .site-header__utils {
    display: none;
  }

  .site-header__brand-right {
    flex-direction: row;
    align-items: center;
  }

  .site-logo {
    margin-left: 8px;
  }

  .nav-toggle {
    margin-left: auto;
    margin-right: 2px;
  }

  .nav-toggle__bar {
    background: #fff;
  }

  .mobile-menu__search {
    display: block;
  }
}

/* 小屏：压缩顶栏高度 */
@media (max-width: 767px) {
  .site-header__brand {
    height: auto;
    min-height: 84px;
  }

  .site-header__brand-inner {
    height: auto;
    min-height: 84px;
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .site-logo {
    margin-top: 0;
    align-self: center;
  }

  .site-logo__img {
    height: 56px;
    max-width: min(100%, 360px);
  }
}

@media (max-width: 767px) {
  .site-footer__grid {
    gap: var(--space-lg);
    padding: var(--space-lg) 0;
  }

  .site-footer__links {
    flex-direction: column;
    gap: 8px;
  }
}

/* 平板端 ≥768px：高度固定 134 */
@media (min-width: 768px) {
  .site-logo__img {
    height: 112px;
    max-width: min(100%, 510px);
    padding: 0;
  }

  .site-header__brand-inner {
    height: 134px;
    min-height: 134px;
  }

  .site-search {
    height: 40px;
    width: 260px;
    max-width: 260px;
  }

  .site-search__btn {
    width: 40px;
    height: 40px;
  }

  .site-footer__grid {
    grid-template-columns: 1fr 1.4fr auto;
    align-items: start;
  }

  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* 平板汉堡态：Logo 为汉堡按钮留出空间，避免顶栏溢出 */
@media (min-width: 768px) and (max-width: 1023px) {
  .site-logo {
    flex: 1 1 auto;
    min-width: 0;
    margin-top: 0;
    align-self: center;
  }

  .site-logo__img {
    height: 96px;
    max-width: min(100%, 420px);
  }

  .site-header__brand-right {
    flex-shrink: 0;
  }

  .mobile-menu {
    inset: calc(var(--header-height-tablet) + env(safe-area-inset-top, 0px)) 0 0 0;
  }
}

/* 桌面端 ≥1024px */
@media (min-width: 1024px) {
  .site-header__utils {
    display: flex;
    font-size: 15px;
  }

  .site-header__nav {
    display: block;
  }

  .site-logo__img {
    height: 112px;
    max-width: min(100%, 510px);
    padding: 0;
  }

  .site-header__brand-inner {
    height: 134px;
    min-height: 134px;
  }

  .site-header__brand-right {
    gap: 12px;
    padding-right: 4px;
  }

  .site-nav {
    display: block;
    flex: 1 1 auto;
    min-width: 0;
    margin: 0;
    overflow: visible;
    width: 100%;
  }

  .site-nav__list {
    width: 100%;
    justify-content: space-between;
    gap: 0;
  }

  .site-nav__item {
    flex: 1 1 0;
  }

  .site-nav__link {
    width: 100%;
    font-size: 18px;
    font-weight: 700;
    padding: 18px 6px;
    border-radius: 0;
  }

  .site-search-wrap {
    flex: 0 0 auto;
    width: 320px;
    max-width: 320px;
    margin-left: 0;
    padding-left: 0;
  }

  .site-search,
  .site-search--brand {
    width: 320px;
    max-width: 320px;
    height: 42px;
  }

  .site-search--brand .site-search__btn {
    width: 46px;
    height: 42px;
  }

  .site-search__btn {
    width: 42px;
    height: 42px;
  }

  .site-search__input {
    font-size: 14px;
    padding: 6px 14px;
  }

  .nav-toggle,
  .mobile-menu {
    display: none;
  }

  .site-footer__grid {
    grid-template-columns: minmax(180px, 1fr) minmax(280px, 1.6fr) auto;
    gap: var(--space-2xl);
  }

  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* 桌面宽度仍紧（1024–1200）：略收导航字号 */
@media (min-width: 1024px) and (max-width: 1200px) {
  .site-logo__img {
    height: 112px;
    max-width: 480px;
    padding: 0;
  }

  .site-nav__link {
    padding: 16px 4px;
    font-size: 16px;
  }

  .site-search-wrap {
    width: 280px;
    max-width: 280px;
  }

  .site-search {
    width: 280px;
    max-width: 280px;
  }
}