/**
 * Leniu Web 后台标准框架（与 Skill：FRAMEWORK-BASELINE.md → WEB-ADMIN-FRAMEWORK.html 一致）
 * 路径：custom-demo-generator/WEB-ADMIN-FRAMEWORK.html
 */
:root {
  --topbar-blue: #4a80f5;
  --topbar-blue-dark: #3d6fd8;
  --menu-text: #333333;
  --menu-text-muted: #595959;
  --menu-active-bg: #e6f0ff;
  --menu-active-text: #2f6fed;
  --content-bg: #f0f2f5;
  --header-h: 52px;
  --sidebar-w: 200px;
  --shadow: 0 2px 8px rgba(0,0,0,.06);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  color: var(--menu-text);
  background: var(--content-bg);
  overflow: hidden;
}
.admin-root {
  display: flex;
  flex-direction: column;
  height: 100vh;
  min-height: 0;
}
.top-header {
  height: var(--header-h);
  min-height: var(--header-h);
  background: var(--topbar-blue);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 20px 0 16px;
  flex-shrink: 0;
  box-shadow: 0 1px 0 rgba(0,0,0,.06);
}
.header-left {
  display: flex;
  align-items: center;
  gap: 20px;
  min-width: 0;
  flex: 1;
}
.logo {
  display: flex;
  align-items: center;
  gap: 2px;
  color: #fff;
  user-select: none;
  font-family: Nunito, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  font-size: 19px;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}
.logo-mark {
  position: relative;
  display: inline-block;
  font-weight: 700;
}
.logo-mark::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -4px;
  width: 6px;
  height: 6px;
  background: #ff4d4f;
  border-radius: 50%;
}
.logo-cn {
  font-size: 18px;
  margin-left: 5px;
  font-weight: 700;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  letter-spacing: 0.08em;
}
.module-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.module-tab {
  color: rgba(255,255,255,.95);
  text-decoration: none;
  padding: 6px 18px;
  border-radius: 999px;
  font-size: 14px;
  white-space: nowrap;
  transition: background .15s, color .15s;
}
.module-tab:hover { background: rgba(255,255,255,.12); }
.module-tab.active {
  background: #fff;
  color: var(--topbar-blue);
  font-weight: 500;
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
}
.header-right {
  display: flex;
  align-items: center;
  gap: 18px;
  color: #fff;
  flex-shrink: 0;
  margin-left: auto;
}
.header-icons {
  display: flex;
  align-items: center;
  gap: 16px;
}
.header-icons i {
  font-size: 16px;
  opacity: .95;
  cursor: pointer;
}
.header-icons i:hover { opacity: 1; }
.header-divider {
  width: 1px;
  height: 20px;
  background: rgba(255,255,255,.45);
}
.user-block {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}
.user-block .avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255,255,255,.25);
  display: flex;
  align-items: center;
  justify-content: center;
}
.layout-body {
  flex: 1;
  display: flex;
  min-height: 0;
}
.sidebar-col {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: #fff;
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-right: 1px solid #e8eaf0;
}
.sidebar-sheet {
  flex: 1;
  background: #fff;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}
.sidebar-menu {
  flex: 1;
  overflow-y: auto;
  padding: 12px 4px 16px 6px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sidebar-menu > .menu-item {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  padding: 12px 10px 12px 12px;
  border-radius: 10px;
  color: var(--menu-text);
  text-decoration: none;
  margin-bottom: 0;
  position: relative;
  transition: background .15s, color .15s;
}
.sidebar-menu > .menu-item i:first-of-type:not(.arrow) {
  width: 18px;
  text-align: center;
  color: var(--menu-text-muted);
  font-size: 15px;
  flex-shrink: 0;
}
.sidebar-menu > .menu-item:hover {
  background: #f5f8ff;
  color: var(--menu-text);
}
.sidebar-menu > .menu-item:hover i:first-of-type:not(.arrow) { color: var(--topbar-blue); }
.sidebar-menu > .menu-item.active:not(.menu-item--expandable) {
  background: var(--menu-active-bg);
  color: var(--menu-active-text);
  font-weight: 500;
}
.sidebar-menu > .menu-item.active:not(.menu-item--expandable) i:first-of-type:not(.arrow) { color: var(--menu-active-text); }
.menu-item span.label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: left;
  font-size: 14px;
}
.menu-item--expandable {
  justify-content: space-between;
  gap: 4px;
  padding-left: 12px !important;
  padding-right: 10px !important;
  cursor: pointer;
}
.menu-item--expandable .menu-item__lead {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
  justify-content: flex-start;
}
.menu-item--expandable .menu-item__lead .label { text-align: left; }
.menu-item--expandable .arrow {
  font-size: 11px;
  opacity: .65;
  margin-left: 4px;
}
.menu-item--expandable.open .arrow { transform: rotate(180deg); }
/* 与一级菜单文字左缘对齐：12px(item pl) + 18px(icon) + 8px(gap) */
.submenu {
  display: none;
  flex-direction: column;
  gap: 2px;
  padding: 0 4px 8px 0;
  margin-top: -6px;
}
.submenu.open { display: flex; }
.submenu-item {
  display: block;
  padding: 9px 10px 9px 38px;
  border-radius: 8px;
  color: var(--menu-text-muted);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
  transition: background .15s, color .15s;
}
.submenu-item:hover {
  background: #f5f8ff;
  color: var(--menu-text);
}
.submenu-item.active {
  background: var(--menu-active-bg);
  color: var(--menu-active-text);
  font-weight: 500;
}
.submenu-ev-wrap {
  padding: 4px 0 0 0;
}
.submenu-ev-head {
  padding: 8px 10px 8px 38px;
  font-size: 14px;
  color: var(--menu-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: 8px;
}
.submenu-ev-head:hover { background: #f5f8ff; }
#evoucherSubmenu {
  background: #f5f8ff;
  border-radius: 8px;
  padding: 4px 0;
  margin-top: 4px;
  display: none;
  flex-direction: column;
}
#evoucherSubmenu.open { display: flex; }
#evoucherSubmenu .submenu-item {
  padding-left: 54px;
  font-size: 14px;
}
.main-area {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--content-bg);
  min-height: 0;
}
.content-scroll {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 8px 12px 12px 8px;
  display: flex;
  flex-direction: column;
}
.content-placeholder {
  flex: 1;
  min-height: 0;
  background: #fff;
  border-radius: 8px;
  padding: 16px;
  box-shadow: var(--shadow);
  color: var(--menu-text);
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.content-placeholder.content-page { overflow: hidden; }
.page-tabs {
  height: 36px;
  flex-shrink: 0;
  background: #fff;
  border-bottom: 1px solid #e8eaf0;
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 4px;
  overflow-x: auto;
  margin: -16px -16px 12px -16px;
  padding-left: 12px;
}
.page-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-size: 13px;
  color: var(--menu-text-muted);
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: 2px;
  white-space: nowrap;
  transition: all 0.2s;
}
.page-tab:hover { color: var(--topbar-blue); }
.page-tab.active {
  color: var(--topbar-blue);
  background: #fff;
  border-color: #e8eaf0;
  font-weight: 500;
}
.tab-close { font-size: 10px; color: #8c8c8c; }
.page-body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 0;
}