/* ============================================================
   nav.css - 导航组件

   用途: Header, 移动端导航, 汉堡菜单, 分类导航
   依赖: core/tokens.css
   ============================================================ */

/* ============================================================
   Header - 页头
   ============================================================ */
.pb-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: var(--color-header-bg, var(--color-bg));
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

/* 滚动时加深阴影 (V2 去玻璃 · 2026-04-19)
   原 backdrop-filter blur + rgba 半透明底, 违反"禁用大面积半透明背景"规则 (04_主题适配.md §3.5)。
   改为: background 继承上方 .pb-header 的实色 (var(--color-header-bg)), 仅靠阴影加深表示 "已脱离页首" 层级。
   T2 深色主题 / T5 靛蓝主题等若需自定义 scrolled 视觉, 在各自 [data-theme="N"] 组件块内覆盖即可。 */
.pb-header.is-scrolled {
  background-color: var(--color-header-bg, var(--color-bg));
  border-bottom-color: var(--color-border);
  box-shadow: 0 4px 20px var(--overlay-text-06);
}

.pb-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  max-width: var(--container-2xl);
  height: var(--header-height);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.pb-header__act {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.pb-header__contact {
  display: none;
}

.pb-header__act .pb-header__contact {
  display: none;
}

.pb-header__search {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.pb-header__search:hover {
  color: var(--color-primary);
}

.pb-header__menu {
  display: flex;
  color: var(--color-text-secondary);
}

/* ============================================================
   Brand - Logo
   ============================================================ */
.pb-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
}

.pb-brand img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.pb-brand__meta {
  display: flex;
  flex-direction: column;
}

.pb-brand__t {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  line-height: var(--line-height-tight);
}

.pb-brand__s {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.pb-brand--compact .pb-brand__t {
  font-size: var(--font-size-md);
}

/* ============================================================
   Burger - 汉堡菜单图标
   ============================================================ */
.pb-burger {
  position: relative;
  display: block;
  width: 20px;
  height: 2px;
  background-color: currentColor;
  border-radius: var(--radius-full);
  transition: background-color var(--duration-200) var(--easing-in-out);
}

.pb-burger::before,
.pb-burger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: var(--radius-full);
  transition: transform var(--duration-200) var(--easing-in-out);
}

.pb-burger::before { top: -6px; }
.pb-burger::after { bottom: -6px; }

.is-open .pb-burger {
  background-color: transparent;
}

.is-open .pb-burger::before {
  transform: translateY(6px) rotate(45deg);
}

.is-open .pb-burger::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* ============================================================
   Navigation - 移动端抽屉导航
   ============================================================ */
.pb-nav {
  position: fixed;
  top: 0;
  right: 0;
  z-index: var(--z-drawer);
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 320px;
  height: 100vh;
  background-color: var(--color-header-bg, var(--color-bg));
  box-shadow: var(--shadow-2xl);
  transform: translateX(100%);
  transition: transform var(--duration-300) var(--easing-in-out);
  overflow-y: auto;
}

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

.pb-nav__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: var(--space-px) solid var(--color-border);
}

.pb-nav__list {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: var(--space-4);
  list-style: none;
}

.pb-nav__item {
  border-bottom: var(--space-px) solid var(--color-border-light);
}

.pb-nav__link {
  flex: 1;
  display: flex;
  align-items: center;
  padding: var(--space-3) 0;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--duration-150) var(--easing-in-out);
}

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

.pb-nav__foot {
  margin-top: auto;
  padding: var(--space-4);
  border-top: var(--space-px) solid var(--color-border);
}

.pb-nav__contact {
  width: 100%;
}

/* ============================================================
   Sort Nav - 分类导航
   ============================================================ */
.pb-sortnav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  min-height: 56px;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding: var(--space-4);
  background-color: var(--color-header-bg, var(--color-bg));
  border-bottom: var(--space-px) solid var(--color-border);
}

.pb-sortnav__link {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  background-color: var(--color-bg-tertiary);
  border: var(--space-px) solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: background-color var(--duration-150) var(--easing-in-out),
              border-color var(--duration-150) var(--easing-in-out),
              color var(--duration-150) var(--easing-in-out);
}

.pb-sortnav__link:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background-color: var(--color-primary-lighter);
}

.pb-sortnav__link.is-active,
.pb-sortnav__link[aria-current="page"] {
  color: var(--color-text-on-primary);
  background-color: var(--color-primary);
  border-color: var(--color-primary);
}

/* ============================================================
   Mobile Bar - 底部导航栏
   ============================================================ */
.pb-mobile-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  display: flex;
  align-items: stretch;
  justify-content: space-around;
  height: 56px;
  padding: 0 env(safe-area-inset-right, 0) env(safe-area-inset-bottom, 0) env(safe-area-inset-left, 0);
  background-color: var(--color-header-bg, var(--color-bg));
  border-top: var(--space-px) solid var(--color-border);
  box-shadow: 0 -2px 10px var(--overlay-black-08);
}

.pb-mobile-bar__item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-width: 64px;
  max-width: 96px;
  padding: var(--space-2) var(--space-2);
  font-size: 11px;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--duration-150) var(--easing-in-out),
              background-color var(--duration-150) var(--easing-in-out);
}

.pb-mobile-bar__item .pg-ico,
.pb-mobile-bar__item svg,
.pb-mobile-bar__item img {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

.pb-mobile-bar__item:hover,
.pb-mobile-bar__item.is-active {
  color: var(--color-primary);
  background-color: var(--color-primary-lighter);
}

.pb-mobile-bar__item--cta {
  flex: 1.2;
  color: var(--color-text-on-primary);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  margin-top: -4px;
  padding-top: var(--space-3);
}

.pb-mobile-bar__item--cta:hover {
  color: var(--color-text-on-primary);
  background: linear-gradient(135deg, var(--color-primary-hover) 0%, var(--color-primary-dark) 100%);
}

body.nav-open .pb-mobile-bar {
  display: none;
}

/* ============================================================
   Responsive - 768px+
   ============================================================ */
@media (min-width: 768px) {
  .pb-header__inner {
    height: var(--header-height);
    padding-inline: var(--space-6);
  }

  .pb-header__act .pb-header__menu {
    display: none;
  }

  .pb-header__act .pb-header__contact {
    display: flex;
  }

  .pb-nav {
    position: static;
    flex-direction: row;
    width: auto;
    max-width: none;
    height: auto;
    background-color: transparent;
    box-shadow: none;
    transform: none;
    overflow: visible;
  }

  .pb-nav__head {
    display: none;
  }

  .pb-nav__list {
    flex-direction: row;
    gap: var(--space-1);
    padding: 0;
  }

  .pb-nav__item {
    position: relative;
    border-bottom: none;
  }

  .pb-nav__link {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
  }

  .pb-nav__link:hover {
    background-color: var(--color-bg-secondary);
  }

  .pb-nav__foot {
    display: none;
  }

  .pb-mobile-bar {
    display: none;
  }
}

/* ============================================================
   Responsive - 1024px+ (仅增量调整)
   ============================================================ */
@media (min-width: 1024px) {
  .pb-header__inner {
    padding-inline: var(--space-8);
  }
}

/* ============================================================
   Nav 补充组件（从 aoyun.base.css 迁移）
   ============================================================ */.pb-nav__close {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2);
  background: transparent;
  border: none;
  cursor: pointer;
}

.pb-nav__text {
  font-size: var(--font-size-sm);
}

/* ============================================================
   Language Dropdown  (pb-lang-dropdown)
   Triggered by {pboot:langswitch} in ParserController.
   Placement: inside .pb-nav (mobile drawer) AND .pb-header__act (desktop).
   Mobile  (<768px): shows inside nav drawer, menu expands statically.
   Desktop (≥768px): icon-button in header action bar, floating dropdown.
   Extend new languages by adding acode entries in ParserController flag_map/short_map.
   ============================================================ */

.pb-lang-dropdown {
  position: relative;
}

.pb-lang-dropdown__trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.3125rem 0.5rem;
  background: transparent;
  border: none;
  border-radius: var(--radius-md, 6px);
  cursor: pointer;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm, 0.875rem);
  font-weight: 500;
  white-space: nowrap;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.pb-lang-dropdown__trigger:hover,
.pb-lang-dropdown__trigger[aria-expanded="true"] {
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
}

.pb-lang-dropdown__trigger:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.pb-lang-dropdown__chevron {
  transition: transform var(--transition-fast);
}

.pb-lang-dropdown__trigger[aria-expanded="true"] .pb-lang-dropdown__chevron {
  transform: rotate(180deg);
}

.pb-lang-dropdown__menu {
  position: absolute;
  top: calc(100% + 0.375rem);
  right: 0;
  min-width: 9rem;
  list-style: none;
  margin: 0;
  padding: 0.25rem 0;
  background: var(--color-bg-primary, #ffffff);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg, 8px);
  box-shadow: var(--shadow-dropdown);
  z-index: var(--z-dropdown, 200);
}

.pb-lang-dropdown__menu[hidden] {
  display: none;
}

.pb-lang-dropdown__item {
  display: flex;
}

.pb-lang-dropdown__link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  width: 100%;
  text-decoration: none;
  font-size: var(--font-size-sm, 0.875rem);
  color: var(--color-text-primary);
  transition: background-color var(--transition-fast);
}

.pb-lang-dropdown__link:hover {
  background-color: var(--color-bg-secondary);
}

.pb-lang-dropdown__link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: -2px;
}

.pb-lang-dropdown__item--active {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  font-size: var(--font-size-sm, 0.875rem);
  color: var(--color-text-primary);
}

.pb-lang-dropdown__item--active .pb-lang-dropdown__name {
  font-weight: 600;
}

.pb-lang-dropdown__check {
  margin-left: auto;
  color: var(--color-primary);
}

.pb-nav .pb-lang-dropdown {
  border-top: 1px solid var(--color-border-light, var(--color-border));
}

.pb-nav .pb-lang-dropdown__trigger {
  width: 100%;
  min-height: 48px;
  justify-content: flex-start;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: 0;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.pb-nav .pb-lang-dropdown__trigger:hover,
.pb-nav .pb-lang-dropdown__trigger[aria-expanded="true"] {
  color: var(--color-primary);
  background-color: transparent;
}

.pb-nav .pb-lang-dropdown__menu {
  position: static;
  box-shadow: none;
  border: none;
  border-radius: 0;
  padding: 0 0 var(--space-2);
  min-width: unset;
  background: transparent;
}

.pb-nav .pb-lang-dropdown__link,
.pb-nav .pb-lang-dropdown__item--active {
  min-height: 40px;
  padding: var(--space-2) var(--space-4);
  padding-left: var(--space-8);
  font-size: var(--font-size-sm);
}

.pb-nav .pb-lang-dropdown__link:hover {
  color: var(--color-primary);
  background: transparent;
}

.pb-nav .pb-lang-dropdown__item--active {
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold, 600);
}

.pb-header__act .pb-lang-dropdown {
  display: none;
}

@media (min-width: 768px) {

  .pb-nav .pb-lang-dropdown {
    display: none;
  }

  .pb-header__act .pb-lang-dropdown {
    display: flex;
    align-items: center;
  }

  .pb-header__act .pb-lang-dropdown__trigger {
    min-height: 2rem;
    padding: 0.25rem 0.5rem;
  }

  .pb-header__act .pb-lang-dropdown__menu {

    right: 0;
    left: auto;
  }
}

/* ============================================================
   Theme 5 · Indigo Aurora (T7) 纯白实色 Header
   版本: T7_INDIGO_AURORA_V2_NO_GLASS · 2026-04-19

   设计意图 (V2 去玻璃):
     T7 的 Header 采用纯白实色 + 靛蓝细描边 + 柔和靛蓝外阴影。
     不使用 backdrop-filter, 不使用 rgba 半透明背景 —— 避免下层正文
     透上来与 Header 内容混搭。
     .is-scrolled 状态仅通过阴影加深体现 "已脱离页首" 的层级关系,
     不改变背景色。

   全主题硬规则: surface 级 rgba < 1 背景 + backdrop-filter 禁用。
     详见 04_主题适配.md §五。
   ============================================================ */
[data-theme="5"] .pb-header {
  background: #ffffff;
  border-bottom: 1px solid rgba(99, 102, 241, 0.18);
  box-shadow: 0 2px 12px rgba(99, 102, 241, 0.08);
}

[data-theme="5"] .pb-header.is-scrolled {
  background: #ffffff;
  border-bottom-color: rgba(99, 102, 241, 0.28);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.14);
}