/**
 * 蓝寻 Layout System V2.0 - 统一页面布局
 * 依赖 design-tokens.css、design-components.css、design-utilities.css。
 * 本文件只提供可选的 .lx- 布局类，不修改浏览器默认样式或现有业务页面。
 */

/* ==================== 应用框架 ==================== */

.lx-layout {
  --lx-layout-sidebar-current: var(--lx-sidebar-width);
  --lx-layout-content-max: var(--lx-page-max-width);

  display: grid;
  grid-template:
    "sidebar header" var(--lx-topbar-height)
    "sidebar page" minmax(0, 1fr)
    "sidebar footer" auto /
    var(--lx-layout-sidebar-current) minmax(0, 1fr);
  min-width: 0;
  min-height: 100vh;
  min-height: 100dvh;
  color: var(--lx-color-text-primary);
  font-family: var(--lx-font-family);
  font-size: var(--lx-font-size-md);
  line-height: var(--lx-line-height-normal);
  background: var(--lx-color-bg-page);
}

.lx-layout,
.lx-layout *,
.lx-layout *::before,
.lx-layout *::after {
  box-sizing: border-box;
}

.lx-layout--sidebar-collapsed {
  --lx-layout-sidebar-current: 72px;
}

.lx-layout__sidebar {
  grid-area: sidebar;
  min-width: 0;
  border-right: 1px solid var(--lx-color-border);
  background: var(--lx-color-bg-card);
}

.lx-layout--sidebar-fixed .lx-layout__sidebar {
  position: sticky;
  top: 0;
  z-index: var(--lx-z-sticky);
  align-self: start;
  height: 100vh;
  height: 100dvh;
}

.lx-layout__mobile-menu,
.lx-layout__scrim,
.lx-bottom-nav {
  display: none;
}

/* ==================== 左侧导航 ==================== */

.lx-sidebar {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  min-height: 0;
  color: var(--lx-color-text-secondary);
  background: var(--lx-color-bg-card);
}

.lx-sidebar__brand {
  display: flex;
  flex: 0 0 var(--lx-topbar-height);
  align-items: center;
  gap: var(--lx-space-12);
  min-width: 0;
  padding: 0 var(--lx-space-20);
  border-bottom: 1px solid var(--lx-color-divider);
  color: var(--lx-color-text-primary);
  text-decoration: none;
}

.lx-sidebar__brand-mark {
  display: inline-grid;
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: var(--lx-radius-md);
  color: var(--lx-color-text-inverse);
  font-size: var(--lx-font-size-lg);
  font-weight: var(--lx-font-weight-bold);
  background: var(--lx-color-primary);
}

.lx-sidebar__brand-copy {
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
}

.lx-sidebar__brand-name {
  display: block;
  font-size: var(--lx-font-size-lg);
  font-weight: var(--lx-font-weight-semibold);
  line-height: var(--lx-line-height-tight);
}

.lx-sidebar__brand-role {
  display: block;
  margin-top: 2px;
  color: var(--lx-color-text-tertiary);
  font-size: var(--lx-font-size-xs);
}

.lx-sidebar__nav {
  flex: 1 1 auto;
  min-height: 0;
  padding: var(--lx-space-12);
  overflow-x: hidden;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-gutter: stable;
}

.lx-sidebar__section + .lx-sidebar__section {
  margin-top: var(--lx-space-20);
}

.lx-sidebar__section-title {
  margin: 0 0 var(--lx-space-8);
  padding: 0 var(--lx-space-12);
  overflow: hidden;
  color: var(--lx-color-text-tertiary);
  font-size: var(--lx-font-size-xs);
  font-weight: var(--lx-font-weight-medium);
  line-height: 24px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lx-sidebar__menu,
.lx-sidebar__submenu {
  display: grid;
  gap: var(--lx-space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.lx-sidebar__submenu {
  margin-top: var(--lx-space-4);
  padding-left: 36px;
}

.lx-sidebar__submenu--level-3 {
  padding-left: var(--lx-space-20);
}

.lx-sidebar__submenu[hidden] {
  display: none;
}

.lx-sidebar__item,
.lx-sidebar__group-toggle {
  position: relative;
  display: flex;
  width: 100%;
  min-width: 0;
  min-height: 40px;
  align-items: center;
  gap: var(--lx-space-12);
  padding: var(--lx-space-8) var(--lx-space-12);
  border: 0;
  border-radius: var(--lx-radius-md);
  color: var(--lx-color-text-secondary);
  font: inherit;
  font-weight: var(--lx-font-weight-medium);
  line-height: var(--lx-line-height-control);
  text-align: left;
  text-decoration: none;
  background: transparent;
  cursor: pointer;
  transition:
    color var(--lx-duration-fast) var(--lx-easing-standard),
    background-color var(--lx-duration-fast) var(--lx-easing-standard);
}

.lx-sidebar__item:hover,
.lx-sidebar__group-toggle:hover {
  color: var(--lx-color-text-primary);
  background: var(--lx-color-bg-hover);
}

.lx-sidebar__item:focus-visible,
.lx-sidebar__group-toggle:focus-visible,
.lx-sidebar__collapse:focus-visible {
  outline: 3px solid var(--lx-color-focus-ring);
  outline-offset: 1px;
}

.lx-sidebar__item[aria-current="page"],
.lx-sidebar__item.is-active,
.lx-sidebar__group-toggle.is-active {
  color: var(--lx-color-primary-active);
  background: var(--lx-color-bg-selected);
}

.lx-sidebar__item[aria-current="page"]::before,
.lx-sidebar__item.is-active::before {
  position: absolute;
  top: 9px;
  bottom: 9px;
  left: 0;
  width: 3px;
  border-radius: 0 var(--lx-radius-sm) var(--lx-radius-sm) 0;
  background: var(--lx-color-primary);
  content: "";
}

.lx-sidebar__icon {
  display: inline-grid;
  flex: 0 0 20px;
  width: 20px;
  height: 20px;
  place-items: center;
  color: currentColor;
  font-size: var(--lx-font-size-sm);
  font-style: normal;
  font-weight: var(--lx-font-weight-semibold);
}

.lx-sidebar__label {
  min-width: 0;
  flex: 1 1 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lx-sidebar__badge {
  display: inline-flex;
  min-width: 20px;
  height: 20px;
  align-items: center;
  justify-content: center;
  padding: 0 6px;
  border-radius: var(--lx-radius-pill);
  color: var(--lx-color-text-inverse);
  font-size: var(--lx-font-size-xs);
  font-weight: var(--lx-font-weight-semibold);
  line-height: 20px;
  background: var(--lx-color-danger);
}

.lx-sidebar__chevron {
  display: inline-block;
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--lx-duration-fast) var(--lx-easing-standard);
}

.lx-sidebar__group-toggle[aria-expanded="true"] .lx-sidebar__chevron {
  transform: rotate(225deg) translate(-1px, -1px);
}

.lx-sidebar__footer {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: var(--lx-space-8);
  padding: var(--lx-space-12);
  border-top: 1px solid var(--lx-color-divider);
}

.lx-sidebar__collapse {
  display: inline-flex;
  width: 100%;
  min-height: var(--lx-control-height);
  align-items: center;
  justify-content: center;
  gap: var(--lx-space-8);
  padding: 0 var(--lx-space-12);
  border: 1px solid var(--lx-color-border);
  border-radius: var(--lx-radius-md);
  color: var(--lx-color-text-secondary);
  font: inherit;
  background: var(--lx-color-bg-card);
  cursor: pointer;
}

.lx-sidebar__collapse:hover {
  color: var(--lx-color-text-primary);
  background: var(--lx-color-bg-hover);
}

.lx-layout--sidebar-collapsed .lx-sidebar__brand {
  justify-content: center;
  padding-right: var(--lx-space-12);
  padding-left: var(--lx-space-12);
}

.lx-layout--sidebar-collapsed .lx-sidebar__brand-copy,
.lx-layout--sidebar-collapsed .lx-sidebar__section-title,
.lx-layout--sidebar-collapsed .lx-sidebar__label,
.lx-layout--sidebar-collapsed .lx-sidebar__chevron,
.lx-layout--sidebar-collapsed .lx-sidebar__collapse-label,
.lx-layout--sidebar-collapsed .lx-sidebar__submenu {
  display: none;
}

.lx-layout--sidebar-collapsed .lx-sidebar__item,
.lx-layout--sidebar-collapsed .lx-sidebar__group-toggle {
  justify-content: center;
  padding-right: var(--lx-space-8);
  padding-left: var(--lx-space-8);
}

.lx-layout--sidebar-collapsed .lx-sidebar__badge {
  position: absolute;
  top: 2px;
  right: 2px;
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  font-size: 10px;
  line-height: 16px;
}

/* ==================== 顶部导航 ==================== */

.lx-header {
  position: sticky;
  top: 0;
  z-index: var(--lx-z-sticky);
  grid-area: header;
  display: flex;
  min-width: 0;
  height: var(--lx-topbar-height);
  align-items: center;
  gap: var(--lx-space-16);
  padding: 0 var(--lx-page-padding);
  border-bottom: 1px solid var(--lx-color-border);
  background: rgba(255, 255, 255, 0.96);
}

.lx-header__leading,
.lx-header__actions,
.lx-header__user {
  display: flex;
  min-width: 0;
  align-items: center;
}

.lx-header__leading {
  flex: 1 1 auto;
  gap: var(--lx-space-12);
}

.lx-header__actions {
  flex: 0 0 auto;
  gap: var(--lx-space-4);
}

.lx-header__user {
  gap: var(--lx-space-8);
  margin-left: var(--lx-space-8);
  padding-left: var(--lx-space-16);
  border-left: 1px solid var(--lx-color-divider);
}

.lx-header__menu-button {
  display: none;
}

.lx-header__logo {
  display: none;
  align-items: center;
  gap: var(--lx-space-8);
  color: var(--lx-color-text-primary);
  font-weight: var(--lx-font-weight-semibold);
  text-decoration: none;
}

.lx-header__breadcrumbs {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: var(--lx-space-8);
  margin: 0;
  padding: 0;
  color: var(--lx-color-text-tertiary);
  font-size: var(--lx-font-size-sm);
  list-style: none;
}

.lx-header__breadcrumbs li {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lx-header__breadcrumbs li + li::before {
  margin-right: var(--lx-space-8);
  color: var(--lx-color-border-strong);
  content: "/";
}

.lx-header__breadcrumbs [aria-current="page"] {
  color: var(--lx-color-text-primary);
  font-weight: var(--lx-font-weight-medium);
}

.lx-header__search {
  position: relative;
  flex: 0 1 280px;
  min-width: 180px;
}

.lx-header__search .lx-input {
  padding-left: 34px;
  background: var(--lx-color-bg-subtle);
}

.lx-header__search-icon {
  position: absolute;
  top: 50%;
  left: var(--lx-space-12);
  color: var(--lx-color-text-tertiary);
  transform: translateY(-50%);
  pointer-events: none;
}

.lx-header__action {
  position: relative;
}

.lx-header__action-count {
  position: absolute;
  top: -3px;
  right: -3px;
  display: inline-grid;
  min-width: 17px;
  height: 17px;
  place-items: center;
  padding: 0 4px;
  border: 2px solid var(--lx-color-bg-card);
  border-radius: var(--lx-radius-pill);
  color: var(--lx-color-text-inverse);
  font-size: 10px;
  font-weight: var(--lx-font-weight-bold);
  line-height: 13px;
  background: var(--lx-color-danger);
}

.lx-header__avatar {
  display: inline-grid;
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 1px solid var(--lx-color-primary-border);
  border-radius: 50%;
  color: var(--lx-color-primary-active);
  font-size: var(--lx-font-size-sm);
  font-weight: var(--lx-font-weight-semibold);
  background: var(--lx-color-primary-soft);
}

.lx-header__user-copy {
  min-width: 0;
}

.lx-header__user-name,
.lx-header__user-role {
  display: block;
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.lx-header__user-name {
  font-size: var(--lx-font-size-sm);
  font-weight: var(--lx-font-weight-semibold);
  line-height: var(--lx-line-height-tight);
}

.lx-header__user-role {
  margin-top: 2px;
  color: var(--lx-color-text-tertiary);
  font-size: var(--lx-font-size-xs);
  line-height: var(--lx-line-height-tight);
}

/* ==================== 页面主体 ==================== */

.lx-page {
  grid-area: page;
  min-width: 0;
  width: 100%;
  padding: var(--lx-page-padding);
  background: var(--lx-color-bg-page);
}

.lx-page__inner {
  width: 100%;
  max-width: var(--lx-layout-content-max);
  margin: 0 auto;
}

.lx-page__heading {
  display: flex;
  min-width: 0;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--lx-space-16);
  margin-bottom: var(--lx-space-20);
}

.lx-page__title {
  margin: 0;
  color: var(--lx-color-text-primary);
  font-size: var(--lx-font-size-3xl);
  font-weight: var(--lx-font-weight-semibold);
  line-height: var(--lx-line-height-tight);
}

.lx-page__description {
  max-width: 760px;
  margin: var(--lx-space-8) 0 0;
  color: var(--lx-color-text-secondary);
  font-size: var(--lx-font-size-md);
}

.lx-page__primary-actions {
  display: flex;
  flex: 0 0 auto;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--lx-space-8);
}

.lx-dashboard {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--lx-space-16);
  margin-bottom: var(--lx-space-20);
}

.lx-dashboard__item {
  min-width: 0;
}

.lx-dashboard__label {
  margin: 0;
  color: var(--lx-color-text-secondary);
  font-size: var(--lx-font-size-sm);
}

.lx-dashboard__value {
  display: block;
  margin-top: var(--lx-space-8);
  color: var(--lx-color-text-primary);
  font-size: var(--lx-font-size-stat);
  font-weight: var(--lx-font-weight-semibold);
  line-height: var(--lx-line-height-tight);
}

.lx-dashboard__meta {
  display: block;
  margin-top: var(--lx-space-8);
  color: var(--lx-color-text-tertiary);
  font-size: var(--lx-font-size-xs);
}

.lx-toolbar {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: var(--lx-space-12);
  margin-bottom: var(--lx-space-16);
  padding: var(--lx-space-12) var(--lx-space-16);
  border: 1px solid var(--lx-color-border);
  border-radius: var(--lx-radius-card);
  background: var(--lx-color-bg-card);
}

.lx-toolbar--secondary {
  margin-top: calc(var(--lx-space-16) * -1);
  border-top: 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  background: var(--lx-color-bg-subtle);
}

.lx-toolbar__group {
  display: flex;
  min-width: 0;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--lx-space-8);
}

.lx-toolbar__group--grow {
  flex: 1 1 auto;
}

.lx-toolbar__search {
  width: min(320px, 100%);
}

.lx-content {
  min-width: 0;
  border: 1px solid var(--lx-color-border);
  border-radius: var(--lx-radius-card);
  background: var(--lx-color-bg-card);
  box-shadow: var(--lx-shadow-card);
}

.lx-content + .lx-content {
  margin-top: var(--lx-space-20);
}

.lx-content__header,
.lx-content__body,
.lx-content__footer {
  min-width: 0;
  padding: var(--lx-space-16) var(--lx-space-20);
}

.lx-content__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--lx-space-12);
  border-bottom: 1px solid var(--lx-color-divider);
}

.lx-content__title {
  margin: 0;
  font-size: var(--lx-font-size-lg);
  font-weight: var(--lx-font-weight-semibold);
  line-height: var(--lx-line-height-tight);
}

.lx-content__body--flush {
  padding: 0;
}

.lx-content__footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--lx-space-8);
  border-top: 1px solid var(--lx-color-divider);
}

.lx-footer {
  grid-area: footer;
  min-width: 0;
  padding: var(--lx-space-16) var(--lx-page-padding) var(--lx-space-20);
  color: var(--lx-color-text-tertiary);
  font-size: var(--lx-font-size-xs);
  text-align: center;
  background: var(--lx-color-bg-page);
}

/* ==================== 抽屉与移动导航 ==================== */

.lx-layout-drawer {
  z-index: var(--lx-z-overlay);
  justify-content: flex-start;
}

.lx-layout-drawer__panel {
  position: relative;
  width: min(300px, calc(100vw - 48px));
  max-width: none;
  padding: 0;
  transform: translateX(0);
}

.lx-layout-drawer__panel .lx-sidebar {
  height: 100%;
}

.lx-layout-drawer__close {
  position: absolute;
  top: var(--lx-space-16);
  right: calc(var(--lx-space-16) * -3);
  border-color: rgba(255, 255, 255, 0.6);
  color: var(--lx-color-text-inverse);
  background: rgba(15, 23, 42, 0.5);
}

.lx-detail-drawer__panel {
  width: min(480px, 100vw);
}

.lx-bottom-nav {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: var(--lx-z-sticky);
  min-height: 58px;
  padding: 5px max(var(--lx-space-8), env(safe-area-inset-right))
    max(5px, env(safe-area-inset-bottom)) max(var(--lx-space-8), env(safe-area-inset-left));
  border-top: 1px solid var(--lx-color-border);
  background: rgba(255, 255, 255, 0.98);
}

.lx-bottom-nav__item {
  display: flex;
  min-width: 0;
  flex: 1 1 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: 44px;
  padding: 2px var(--lx-space-4);
  border: 0;
  border-radius: var(--lx-radius-sm);
  color: var(--lx-color-text-tertiary);
  font: inherit;
  font-size: var(--lx-font-size-xs);
  text-decoration: none;
  background: transparent;
}

.lx-bottom-nav__item:hover,
.lx-bottom-nav__item[aria-current="page"] {
  color: var(--lx-color-primary);
  background: var(--lx-color-primary-soft);
}

.lx-bottom-nav__icon {
  font-size: var(--lx-font-size-lg);
  font-weight: var(--lx-font-weight-semibold);
  line-height: 20px;
}

@media (prefers-reduced-motion: reduce) {
  .lx-sidebar__item,
  .lx-sidebar__group-toggle,
  .lx-sidebar__chevron {
    transition: none;
  }
}