/* ==========================================================================
   header.css — 顶部导航 / 下拉菜单 / 移动端抽屉
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--line);
  transition: box-shadow 0.24s var(--ease);
}

.site-header.is-scrolled {
  box-shadow: 0 8px 24px -16px rgba(21, 40, 61, 0.45);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  height: var(--header-h);
}

/* --------------------------------------------------------------------------
   Brand
   -------------------------------------------------------------------------- */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  flex: none;
  min-width: 0;
}

.brand__mark {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0.03em;
  line-height: 1;
  color: var(--navy);
  padding-bottom: 2px;
  border-bottom: 3px solid var(--orange);
}

.brand__divider {
  width: 1px;
  height: 30px;
  background: var(--line);
  flex: none;
}

.brand__text {
  display: none;
  line-height: 1.25;
}

.brand__name {
  display: block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--navy);
}

.brand__desc {
  display: block;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

@media (min-width: 480px) {
  .brand__text {
    display: block;
  }
}

@media (max-width: 1199.98px) {
  .brand__divider,
  .brand__text {
    display: none;
  }
}

@media (max-width: 1199.98px) {
  :root {
    --header-h: 64px;
  }

  .brand__mark {
    font-size: 23px;
  }
}

/* --------------------------------------------------------------------------
   Desktop navigation
   -------------------------------------------------------------------------- */

.nav {
  display: none;
}

@media (min-width: 1200px) {
  .nav {
    display: block;
    margin-left: auto;
  }
}

.nav__list {
  display: flex;
  align-items: center;
}

.nav__item {
  position: relative;
}

.nav__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: var(--header-h);
  padding: 0 10px;
  font-size: 0.875rem;
  font-weight: 550;
  color: var(--text);
  position: relative;
  transition: color 0.16s var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 20px;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s var(--ease);
}

.nav__link:hover,
.nav__link[aria-expanded="true"] {
  color: var(--navy);
}

.nav__link:hover::after,
.nav__link[aria-expanded="true"]::after {
  transform: scaleX(1);
}

.nav__caret {
  width: 10px;
  height: 10px;
  flex: none;
  color: var(--muted);
  transition: transform 0.2s var(--ease);
}

.nav__link[aria-expanded="true"] .nav__caret {
  transform: rotate(180deg);
}

/* Dropdown panel */

.nav__panel {
  position: absolute;
  top: calc(var(--header-h) - 10px);
  left: 0;
  min-width: 300px;
  padding: 10px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 2px solid var(--navy);
  border-radius: var(--r-sm);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease),
    visibility 0.18s;
}

.nav__item.is-open > .nav__panel {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.nav__panel-link {
  display: block;
  padding: 9px 12px;
  border-radius: var(--r-xs);
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--text);
  transition: background-color 0.15s var(--ease), color 0.15s var(--ease);
}

.nav__panel-link:hover,
.nav__panel-link:focus-visible {
  background: var(--bg);
  color: var(--navy);
}

.nav__panel-foot {
  margin-top: 8px;
  padding: 10px 12px 4px;
  border-top: 1px solid var(--line);
}

/* Products 面板：分类清单读自 product_category，数量随后台上新而变化。
   两列排，避免 10 项单列把面板拉到大半个屏高。 */
.nav__panel--products {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 8px;
  min-width: 540px;
}

.nav__panel--products .nav__panel-foot {
  grid-column: 1 / -1;
}

/* 仅在支持 hover 的设备上启用悬停展开，避免触摸设备误触 */
@media (hover: hover) and (min-width: 1200px) {
  .nav__item:hover > .nav__panel {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

.header-actions .btn {
  --btn-h: 42px;
  padding: 0 18px;
  font-size: 0.875rem;
}

@media (max-width: 575.98px) {
  .header-actions {
    gap: 8px;
  }

  .header-actions .btn {
    --btn-h: 38px;
    padding: 0 12px;
    font-size: 0.8125rem;
  }

  .brand {
    gap: 8px;
  }
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-right: -6px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
}

@media (min-width: 1200px) {
  .nav-toggle {
    display: none;
  }
}

.nav-toggle__bar {
  display: block;
  width: 19px;
  height: 2px;
  background: var(--navy);
  transition: transform 0.22s var(--ease), opacity 0.16s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   Mobile drawer
   -------------------------------------------------------------------------- */

.mobile-nav {
  position: fixed;
  top: var(--header-h);
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 95;
  display: flex;
  flex-direction: column;
  padding: 4px 0 48px;
  background: var(--white);
  overflow-y: auto;
  overscroll-behavior: contain;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease),
    visibility 0.22s;
}

.mobile-nav.is-open {
  opacity: 1;
  visibility: visible;
  transform: none;
}

@media (min-width: 1200px) {
  .mobile-nav {
    display: none;
  }
}

.mnav__list {
  padding: 0 var(--sp-5);
}

.mnav__row {
  border-bottom: 1px solid var(--line);
}

.mnav__link,
.mnav__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: 100%;
  padding: 16px 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--navy);
  text-align: left;
}

.mnav__toggle .nav__caret {
  width: 12px;
  height: 12px;
}

.mnav__toggle[aria-expanded="true"] .nav__caret {
  transform: rotate(180deg);
}

.mnav__sub {
  display: none;
  padding: 2px 0 14px 14px;
  border-left: 2px solid var(--line);
  margin-bottom: 6px;
}

.mnav__sub.is-open {
  display: block;
}

.mnav__sub a {
  display: block;
  padding: 8px 0;
  font-size: 0.9375rem;
  color: var(--muted);
}

.mnav__sub a:hover,
.mnav__sub a:focus-visible {
  color: var(--navy);
}

.mnav__actions {
  padding: var(--sp-5);
  display: grid;
  gap: 10px;
}

.mnav__meta {
  padding: 0 var(--sp-5);
  margin-top: 4px;
  font-size: 0.8125rem;
  color: var(--muted);
  line-height: 1.7;
}

body.nav-open {
  overflow: hidden;
}