#app {
  .main-container {
    height: calc(100% - 50px);
    transition: margin-left .28s;
    margin-left: $base-sidebar-width;
    position: relative;
  }
  .sidebarHide {
    margin-left: 0 !important;
  }
  .sidebar-container {
    -webkit-transition: width .28s;
    transition: width 0.28s;
    width: 239px !important;
    background: url('../images/sidebar-background.webp') no-repeat center;
    // background-color: $base-menu-background;
    background-size: 100% 100%;
    height: 100%;
    position: fixed;
    font-size: 0px;
    top: -8px;
    bottom: 0;
    left: 0;
    z-index: 1001;
    overflow: hidden;
    -webkit-box-shadow: 2px 0 6px rgba(0, 21, 41, .35);
    box-shadow: 2px 0 6px rgba(0, 21, 41, .35);
    // reset element-ui css
    .horizontal-collapse-transition {
      transition: 0s width ease-in-out, 0s padding-left ease-in-out, 0s padding-right ease-in-out;
    }
    .scrollbar-wrapper {
      overflow-x: hidden !important;
    }

    .el-scrollbar__bar.is-vertical {
      right: 0px;
    }

    .el-scrollbar {
      height: 100%;
    }

    &.has-logo {
      .el-scrollbar {
        height: calc(100% - 50px);
      }
    }

    .is-horizontal {
      display: none;
    }

    a {
      display: inline-block;
      width: 100%;
      overflow: hidden;
    }

    .svg-icon {
      margin-right: 16px;
    }
    .el-menu {
      border: none;
      height: 100%;
      width: 100% !important;
      background-color: transparent !important;
      padding: 25px 18px;

      .el-sub-menu {
        margin-bottom: 15px !important;
        .el-sub-menu__title {
          height: 37px;
          line-height: 37px;
          background: url('../images/sidebar-normal.png') no-repeat;
          background-size: 100% 100% !important;
        }
        .el-menu {
          padding: 1px 18px !important;
          .el-menu-item {
            min-width: 100% !important;
            height: 30px;
            color: #fff;
            padding-left: 4px;
            background: transparent !important;
            margin-bottom: 0px;
            &:hover {
              background: transparent !important;
            }
          }
        }
      }
      .is-opened{
        margin-bottom: 0px !important;
      }
      .el-menu-item {
        display: flex;
        align-items: center;
        margin-bottom: 20px;
        height: 37px;
        line-height: 37px;
        color: #fff;
        background: url('../images/sidebar-normal.png') no-repeat;
        background-size: 100% 100% !important;
      }

      .is-active {
        background: url('../images/sidebar-active.png') no-repeat !important;
        .el-menu{
          .nest-menu{
            .is-active{
              color: #008efe !important;
            }
          }
        }
        .el-sub-menu__title {
          background: url('../images/sidebar-active.png') no-repeat !important;
          background-size: 100% 100% !important;
        }
      }

    }

    .el-menu-item,
    .menu-title {
      // overflow: hidden !important;
      // text-overflow: ellipsis !important;
      // white-space: nowrap !important;
    }

    .el-menu-item .el-menu-tooltip__trigger {
      display: inline-block !important;
    }

    // menu hover
    .sub-menu-title-noDropdown,
    .el-sub-menu__title {
      &:hover {
        background-color: rgba(0, 0, 0, 0.06) !important;
      }
    }

    & .theme-dark .is-active>.el-sub-menu__title {
      color: $base-menu-color-active !important;
    }

    & .nest-menu .el-sub-menu>.el-sub-menu__title,
    & .el-sub-menu .el-menu-item {
      min-width: $base-sidebar-width !important;

      &:hover {
        background-color: rgba(0, 0, 0, 0.06) !important;
      }
    }

    & .theme-dark .nest-menu .el-sub-menu>.el-sub-menu__title,
    & .theme-dark .el-sub-menu .el-menu-item {
      background-color: $base-sub-menu-background !important;

      &:hover {
        background-color: $base-sub-menu-hover !important;
      }
    }
  }
  .hideSidebar {
    .sidebar-container {
      width: 54px !important;
    }

    .main-container {
      margin-left: 54px;
    }

    .sub-menu-title-noDropdown {
      padding: 0 !important;
      position: relative;

      .el-tooltip {
        padding: 0 !important;

        .svg-icon {
          margin-left: 20px;
        }
      }
    }

    .el-sub-menu {
      overflow: hidden;

      &>.el-sub-menu__title {
        padding: 0 !important;

        .svg-icon {
          margin-left: 20px;
        }

      }
    }

    .el-menu--collapse {
      .el-sub-menu {
        &>.el-sub-menu__title {
          &>span {
            height: 0;
            width: 0;
            overflow: hidden;
            visibility: hidden;
            display: inline-block;
          }

          &>i {
            height: 0;
            width: 0;
            overflow: hidden;
            visibility: hidden;
            display: inline-block;
          }
        }
      }
    }
  }
  .el-menu--collapse .el-menu .el-sub-menu {
    min-width: $base-sidebar-width !important;
  }
  // mobile responsive
  .mobile {
    .main-container {
      margin-left: 0px;
    }

    .sidebar-container {
      transition: transform .28s;
      width: $base-sidebar-width !important;
    }

    &.hideSidebar {
      .sidebar-container {
        pointer-events: none;
        transition-duration: 0.3s;
        transform: translate3d(-$base-sidebar-width, 0, 0);
      }
    }
  }
  .withoutAnimation {
    .main-container,
    .sidebar-container {
      transition: none;
    }
  }

  .platform-admin-main {
    height: calc(100vh - 50px);
    overflow: auto !important;
    background:
      radial-gradient(circle at 12% 18%, rgba(14, 74, 112, 0.45), transparent 34%),
      radial-gradient(circle at 78% 6%, rgba(25, 92, 170, 0.3), transparent 28%),
      linear-gradient(135deg, #03070e 0%, #061827 48%, #02060d 100%) !important;

    &::-webkit-scrollbar {
      width: 5px;
      height: 5px;
    }

    &::-webkit-scrollbar-track {
      background: #111a24;
      border-radius: 10px;
    }

    &::-webkit-scrollbar-thumb {
      background: #2d8fcf;
      border-radius: 10px;
    }
  }

  .studentLayout,
  .teacherLayout {
    background:
      radial-gradient(circle at 10% 20%, rgba(11, 42, 74, 0.74), transparent 34%),
      radial-gradient(circle at 88% 8%, rgba(0, 136, 210, 0.24), transparent 28%),
      linear-gradient(135deg, #02050c 0%, #07101d 52%, #02060d 100%);

    .main-container {
      margin-left: 304px;
      background:
        radial-gradient(circle at 10% 20%, rgba(11, 42, 74, 0.72), transparent 34%),
        radial-gradient(circle at 88% 8%, rgba(0, 136, 210, 0.22), transparent 28%),
        linear-gradient(135deg, #02050c 0%, #07101d 52%, #02060d 100%);
    }

    .app-main,
    .teacher-main {
      height: calc(100vh - 50px);
      padding: 28px 32px 40px 24px;
      overflow: auto;
      background:
        radial-gradient(circle at 12% 18%, rgba(14, 74, 112, 0.45), transparent 34%),
        radial-gradient(circle at 78% 6%, rgba(25, 92, 170, 0.3), transparent 28%),
        linear-gradient(135deg, #03070e 0%, #061827 48%, #02060d 100%) !important;

      &::-webkit-scrollbar {
        width: 5px;
        height: 5px;
      }

      &::-webkit-scrollbar-track {
        background: #111a24;
        border-radius: 10px;
      }

      &::-webkit-scrollbar-thumb {
        background: #2d8fcf;
        border-radius: 10px;
      }
    }

    .sidebar-container {
      top: 50px;
      width: 304px !important;
      height: calc(100% - 50px);
      padding: 0;
      background: transparent !important;
      border-right: 0;
      box-shadow: none;
      overflow: hidden;

      &::before {
        display: none;
      }

      &.student-sidebar-shell {
        position: fixed;
        z-index: 1;
        height: calc(100% - 50px);
        background: transparent !important;
      }

      .student-sidebar-scroll {
        height: 100%;
      }

      .scrollbar-wrapper {
        overflow-x: hidden !important;
      }

      .student-course-nav {
        width: calc(100% - 40px);
        min-height: calc(100% - 56px);
        margin: 28px 20px;
        padding: 24px 16px 28px;
        border: 1px solid rgba(0, 180, 255, 0.25);
        border-radius: 32px;
        background: rgba(8, 18, 28, 0.7);
        box-shadow: 0 22px 48px rgba(0, 0, 0, 0.22), inset 0 1px 0 rgba(169, 229, 255, 0.08);
        backdrop-filter: blur(12px);
      }

      .student-course-heading {
        display: flex;
        align-items: center;
        gap: 10px;
        width: 100%;
        min-height: 22px;
        margin: 0 0 14px;
        border: 0;
        padding: 0 6px;
        line-height: 1.35;
        text-align: left;
        color: #7e9fc5;
        background: transparent;
        font-family: inherit;
        font-size: 12px;
        font-weight: 800;
        letter-spacing: 1.6px;
        text-transform: uppercase;
        white-space: normal;
        cursor: pointer;
        transition: color 0.2s ease;
      }

      .student-course-heading:hover,
      .student-course-heading.active {
        color: #c9edff;
      }

      .student-course-list {
        margin: 0 0 28px;
      }

      .student-course-link {
        position: relative;
        display: flex;
        align-items: center;
        gap: 10px;
        width: 100%;
        min-height: 42px;
        margin: 0 0 8px;
        border: 1px solid transparent;
        border-radius: 18px;
        padding: 10px 14px 10px 16px;
        line-height: 1.4;
        text-align: left;
        color: #d7e9ff;
        background: rgba(255, 255, 255, 0.025);
        font-family: inherit;
        font-size: 15px;
        font-weight: 700;
        letter-spacing: 0;
        white-space: normal;
        overflow: hidden;
        cursor: pointer;
        transition: color 0.2s ease, transform 0.2s ease, border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
      }

      .student-course-icon {
        position: relative;
        z-index: 1;
        display: inline-flex;
        flex: 0 0 auto;
        align-items: center;
        justify-content: center;
        width: 26px;
        height: 26px;
        border: 1px solid rgba(0, 170, 255, 0.26);
        border-radius: 10px;
        color: #7ee9ff;
        background:
          linear-gradient(135deg, rgba(0, 170, 255, 0.24), rgba(43, 110, 255, 0.08)),
          rgba(1, 24, 36, 0.82);
        box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 0 10px rgba(0, 170, 255, 0.08);

        svg {
          width: 15px;
          height: 15px;
        }
      }

      .student-course-icon--heading {
        width: 22px;
        height: 22px;
        border-radius: 9px;
        color: #9defff;
        background: rgba(0, 132, 198, 0.18);

        svg {
          width: 13px;
          height: 13px;
        }
      }

      .student-course-text {
        min-width: 0;
        flex: 1;
      }

      .student-course-link:hover,
      .student-course-link.active {
        color: #ffffff;
        border-color: rgba(0, 170, 255, 0.72);
        background: linear-gradient(95deg, rgba(0, 160, 255, 0.2), rgba(0, 100, 200, 0.1));
        box-shadow: 0 2px 14px rgba(0, 170, 255, 0.18);
        transform: translateX(3px);
      }

      .student-course-link.active {
        border-left: 3px solid #00aaff;
      }

      .student-course-link.disabled {
        cursor: default;
      }

      .student-report-button {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        width: calc(100% - 28px);
        min-height: 44px;
        margin: 18px 14px 0;
        border: 1px solid rgba(0, 170, 255, 0.65);
        border-radius: 40px;
        line-height: 42px;
        text-align: center;
        color: #caf0ff;
        background: rgba(0, 160, 255, 0.15);
        font-family: inherit;
        font-size: 14px;
        font-weight: 800;
        cursor: pointer;
        transition: background 0.2s ease, box-shadow 0.2s ease;

        &:hover,
        &.active {
          color: #ffffff;
          background: rgba(0, 170, 255, 0.26);
          box-shadow: 0 0 14px rgba(34, 183, 237, 0.32);
        }
      }
    }
  }

  .mobile.studentLayout,
  .mobile.teacherLayout {
    .main-container {
      margin-left: 0;
    }

    .sidebar-container {
      width: 304px !important;
    }

    &.hideSidebar {
      .sidebar-container {
        transform: translate3d(-304px, 0, 0);
      }
    }
  }

  .teacherLayout {
    .sidebar-container {
      border-right: 1px solid rgba(0, 180, 255, 0.24);

      &::after {
        content: "";
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        z-index: 3;
        width: 1px;
        background: linear-gradient(180deg, rgba(81, 211, 255, 0.38), rgba(81, 211, 255, 0.18) 45%, rgba(81, 211, 255, 0.28));
        pointer-events: none;
      }

      .student-sidebar-scroll,
      .el-scrollbar__wrap,
      .el-scrollbar__view {
        height: 100%;
      }

      .el-scrollbar__bar.is-vertical {
        right: 4px;
        opacity: 0;
        transition: opacity 0.2s ease;
      }

      &:hover .el-scrollbar__bar.is-vertical {
        opacity: 1;
      }

      .student-course-nav {
        width: 100%;
        height: 100%;
        min-height: 100%;
        margin: 0;
        padding: 28px 20px;
        box-sizing: border-box;
        border: 0;
        border-radius: 0;
        background:
          radial-gradient(circle at 18% 10%, rgba(0, 170, 255, 0.12), transparent 34%),
          rgba(8, 18, 28, 0.82);
        box-shadow: inset -1px 0 0 rgba(169, 229, 255, 0.06), 12px 0 32px rgba(0, 5, 16, 0.2);
      }

      .student-course-list {
        margin-bottom: 0;
      }

      .student-course-link {
        min-height: 46px;
        margin-bottom: 10px;
      }

      .course-sidebar-toggle {
        position: absolute;
        top: 14px;
        right: 14px;
        z-index: 8;
        display: grid;
        width: 32px;
        height: 32px;
        place-items: center;
        border: 1px solid rgba(89, 218, 255, 0.5);
        border-radius: 9px;
        color: #dff8ff;
        background: rgba(5, 54, 83, 0.84);
        box-shadow: 0 0 14px rgba(0, 170, 255, 0.15);
        font-size: 24px;
        line-height: 1;
        cursor: pointer;
        transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;

        &:hover {
          border-color: #70e4ff;
          background: rgba(11, 116, 160, 0.8);
          transform: translateX(1px);
        }
      }
    }

    &.hideSidebar {
      .sidebar-container {
        width: 64px !important;

        .student-course-nav {
          padding: 58px 10px 24px;
        }

        .student-course-heading,
        .student-course-link {
          justify-content: center;
          padding-right: 0;
          padding-left: 0;
        }

        .student-course-heading {
          margin-bottom: 14px;
        }

        .student-course-link {
          min-height: 42px;
          margin-bottom: 10px;
        }

        .student-course-text {
          display: none;
        }

        .course-sidebar-toggle {
          right: 16px;
          transform: none;
        }
      }

      .main-container {
        margin-left: 64px;
      }
    }

  }

  /* 仅学生实训任务页提供课程导航的图标轨道，离开任务页不改变原有学生布局。 */
  .studentLayout:has(.student-training-shell) {
    .sidebar-container {
      border-right: 1px solid rgba(0, 180, 255, 0.24);

      .student-course-nav {
        margin: 20px;
      }

      .course-sidebar-toggle {
        position: absolute;
        top: 28px;
        right: 28px;
        z-index: 8;
        display: grid;
        width: 32px;
        height: 32px;
        place-items: center;
        border: 1px solid rgba(89, 218, 255, 0.5);
        border-radius: 9px;
        color: #dff8ff;
        background: rgba(5, 54, 83, 0.84);
        box-shadow: 0 0 14px rgba(0, 170, 255, 0.15);
        font-size: 24px;
        line-height: 1;
        cursor: pointer;
        transition: background .2s ease, border-color .2s ease, transform .2s ease;

        &:hover,
        &:focus-visible {
          border-color: #70e4ff;
          outline: none;
          background: rgba(11, 116, 160, 0.8);
          transform: translateX(1px);
        }
      }
    }

    &.hideSidebar {
      .sidebar-container {
        width: 64px !important;

        .student-course-nav {
          box-sizing: border-box;
          width: 100%;
          min-height: 100%;
          margin: 0;
          padding: 58px 11px 24px;
          border: 0;
          border-radius: 0;
          background:
            linear-gradient(180deg, rgba(8, 31, 47, .92), rgba(3, 16, 28, .98));
          box-shadow: inset -1px 0 0 rgba(132, 228, 255, .1);
        }

        .student-course-heading,
        .student-course-link {
          box-sizing: border-box;
          width: 42px;
          justify-content: center;
          padding-right: 0;
          padding-left: 0;
        }

        /* 分类名收起后没有辨识价值，保留具有页面入口的标题按钮。 */
        div.student-course-heading {
          display: none;
        }

        .student-course-heading {
          min-height: 42px;
          margin: 0 0 10px;
        }

        .student-course-link {
          min-height: 42px;
          margin: 0 0 8px;
          border-radius: 13px;
          background: rgba(255, 255, 255, .025);
        }

        .student-course-list {
          margin: 0 0 10px;
        }

        .student-course-text {
          display: none;
        }

        .student-course-icon {
          width: 27px;
          height: 27px;
        }

        .student-course-link.active {
          border: 1px solid rgba(0, 190, 255, .85);
          background: linear-gradient(135deg, rgba(0, 174, 255, .28), rgba(18, 95, 190, .14));
          box-shadow: 0 0 14px rgba(0, 178, 255, .25);
          transform: none;
        }

        .course-sidebar-toggle {
          top: 12px;
          right: 16px;
          transform: none;
        }
      }

      .main-container {
        margin-left: 64px;
      }
    }
  }
}
// when menu collapsed
.el-menu--vertical {
  &>.el-menu {
    .svg-icon {
      margin-right: 16px;
    }
  }

  .nest-menu .el-sub-menu>.el-sub-menu__title,
  .el-menu-item {
    &:hover {
      // you can use $sub-menuHover
      background-color: rgba(0, 0, 0, 0.06) !important;
    }
  }

  // the scroll bar appears when the sub-menu is too long
  >.el-menu--popup {
    max-height: 100vh;
    overflow-y: auto;

    &::-webkit-scrollbar-track-piece {
      background: #d3dce6;
    }

    &::-webkit-scrollbar {
      width: 6px;
    }

    &::-webkit-scrollbar-thumb {
      background: #99a9bf;
      border-radius: 20px;
    }
  }
}

/*
 * 学生端 + 教师端共用亮色主题覆盖
 * 取代 #app .studentLayout, #app .teacherLayout 共享的暗色背景（L274-411）
 * 超管端 (role 1) 走独立深色路径：#app .platform-admin-main (L250-272)
 */
#app .studentLayout,
#app .teacherLayout {
  // 整体浅色背景 + 蓝色点缀，营造明亮的科技感
  background:
    radial-gradient(circle at 10% 20%, rgba(30, 136, 229, 0.07), transparent 34%),
    radial-gradient(circle at 88% 8%, rgba(66, 165, 245, 0.05), transparent 28%),
    linear-gradient(135deg, #f5f8fc 0%, #eaf2fb 52%, #f3f8ff 100%) !important;

  .main-container {
    background:
      radial-gradient(circle at 10% 20%, rgba(30, 136, 229, 0.06), transparent 34%),
      radial-gradient(circle at 88% 8%, rgba(66, 165, 245, 0.04), transparent 28%),
      linear-gradient(135deg, #f5f8fc 0%, #eaf2fb 52%, #f3f8ff 100%) !important;
  }

  .app-main,
  .teacher-main {
    background:
      radial-gradient(circle at 12% 18%, rgba(30, 136, 229, 0.05), transparent 34%),
      radial-gradient(circle at 78% 6%, rgba(66, 165, 245, 0.04), transparent 28%),
      linear-gradient(135deg, #f7fafd 0%, #eef4fb 48%, #f5f8fc 100%) !important;

    &::-webkit-scrollbar {
      width: 6px;
      height: 6px;
    }

    &::-webkit-scrollbar-track {
      background: rgba(30, 60, 100, 0.06);
      border-radius: 10px;
    }

    &::-webkit-scrollbar-thumb {
      background: rgba(30, 136, 229, 0.35);
      border-radius: 10px;

      &:hover {
        background: rgba(30, 136, 229, 0.55);
      }
    }
  }

  // 侧边栏整体：纯白极简（Stripe/Linear 风），右侧 1px 灰线，无玻璃无发光
  .sidebar-container {
    border-right: 1px solid #e5e7eb !important;
    background: #ffffff !important;
    box-shadow: none !important;

    &::after {
      display: none !important;
    }

    // 教师端导航容器：透明，交给容器白底
    .student-course-nav {
      background: transparent !important;
      box-shadow: none !important;
      backdrop-filter: none !important;
    }

    // 分组标题：小号灰字
    .student-course-heading {
      color: #9ca3af !important;
      font-size: 11px;
      font-weight: 600;
      letter-spacing: 0.02em;

      &:hover,
      &.active {
        color: #6b7280 !important;
      }
    }

    // 菜单项：默认透明无边框；hover 中性灰；激活淡蓝平底 + 细指示条
    .student-course-link {
      color: #374151 !important;
      background: transparent !important;
      border: none !important;
      border-radius: 6px !important;
      box-shadow: none !important;
      // 连续列表风：小间距贴边排列，压过共用区 8px 胶囊悬浮间距
      margin: 0 0 2px !important;
      min-height: 40px !important;
      padding: 0 12px !important;
      transition: background-color 0.15s ease, color 0.15s ease;

      &:hover {
        color: #1f2937 !important;
        background: #f5f7fa !important;
      }

      // 激活：无渐变、无发光；2px 短指示条（Stripe 式）+ 蓝字 + 蓝色软底
      &.active {
        color: #2563eb !important;
        font-weight: 600;
        background: #eff6ff !important;
        border-left: none !important;
        position: relative;

        &::before {
          content: "";
          position: absolute;
          left: 0;
          top: 22%;
          bottom: 22%;
          width: 2px;
          border-radius: 1px;
          background: #2563eb;
        }
      }
    }

    // 图标容器：透明无边框，颜色跟随菜单文字
    .student-course-icon {
      color: inherit !important;
      border-color: transparent !important;
      background: transparent !important;
      box-shadow: none !important;

      &--heading {
        color: #9ca3af !important;
        background: transparent !important;
      }
    }

    // 报告按钮（如有）：白底灰边 ghost
    .student-report-button {
      color: #374151 !important;
      background: #ffffff !important;
      border-color: #e5e7eb !important;

      &:hover,
      &.active {
        color: #2563eb !important;
        background: #eff6ff !important;
        border-color: rgba(37, 99, 235, 0.35) !important;
      }
    }

    // 折叠把手：贴侧边栏右缘、垂直居中的极小竖条（全 !important 压过旧深色块）
    .course-sidebar-toggle {
      position: absolute !important;
      top: 50% !important;
      right: 0 !important;
      transform: translateY(-50%) !important;
      z-index: 8;
      display: flex !important;
      align-items: center !important;
      justify-content: center !important;
      box-sizing: border-box !important;
      width: 14px !important;
      height: 44px !important;
      padding: 0 !important;
      border: 1px solid #e5e7eb !important;
      border-right: 0 !important;
      border-radius: 8px 0 0 8px !important;
      background: #ffffff !important;
      color: #9ca3af !important;
      box-shadow: -2px 0 6px rgba(17, 24, 39, 0.08) !important;
      cursor: pointer;
      transition: background-color 0.15s ease, color 0.15s ease;

      .toggle-arrow { font-size: 10px; }
      .toggle-arrow--right { display: none; }

      &:hover,
      &:focus-visible {
        background: #1f2937 !important;
        color: #ffffff !important;
        outline: none;
      }
    }
  }

  // 折叠态：左箭头隐藏、右箭头显示（与 .sidebar-container 同级，避免嵌套出双容器）
  .sidebar-container.is-collapse .course-sidebar-toggle {
    .toggle-arrow--left { display: none; }
    .toggle-arrow--right { display: inline-flex; }
  }
}

/*
 * 学生端 + 教师端实训页背景覆盖
 * student-training.scss 中 .student-training-shell 的暗色背景统一覆盖为亮色
 */
#app .studentLayout .app-main:has(.student-training-shell),
#app .teacherLayout .app-main:has(.student-training-shell) {
  background: linear-gradient(135deg, #f5f8fc 0%, #eaf2fb 52%, #f3f8ff 100%) !important;
}

#app .studentLayout .app-main:has(.student-training-shell) .student-training-shell,
#app .teacherLayout .app-main:has(.student-training-shell) .student-training-shell {
  background: transparent !important;
}

/* ========================================================================
 * 学生端课程菜单（role 4）墨黑极简主题
 * 1) 仅命中 .is-student-nav，教师端 teacherLayout 不受影响
 * 2) 置于文件末尾，选择器多出一个 .is-student-nav 类，覆盖前文共享亮色块
 * 3) 风格：白底 + 墨黑选中块，去玻璃卡片/渐变/胶囊/位移动画
 * ====================================================================== */
#app .studentLayout {
  .sidebar-container.is-student-nav {
    background: #ffffff !important;
    border-right: 1px solid #e5e7eb !important;
    box-shadow: none !important;

    &::after { display: none !important; }

    .student-sidebar-scroll,
    .el-scrollbar__wrap,
    .el-scrollbar__view {
      height: 100%;
    }

    /* 侧边栏滚动条中性化 */
    .el-scrollbar__wrap {
      &::-webkit-scrollbar { width: 5px; }
      &::-webkit-scrollbar-track { background: transparent; }
      &::-webkit-scrollbar-thumb {
        background: #d1d5db;
        border-radius: 10px;
      }
      &::-webkit-scrollbar-thumb:hover { background: #9ca3af; }
    }

    .el-scrollbar__bar.is-vertical {
      right: 4px;
      opacity: 0;
      transition: opacity 0.2s ease;
    }

    &:hover .el-scrollbar__bar.is-vertical { opacity: 1; }
  }

  /* el-menu 菜单容器：白底、紧凑行高 */
  .sidebar-container.is-student-nav .student-course-menu {
    box-sizing: border-box;
    width: 100%;
    border-right: 0;
    background: #ffffff;
    padding: 12px 10px;
    --el-menu-item-height: 46px;
    --el-menu-sub-item-height: 46px;
  }

  /* 一级行（直跳项 / 分组标题）：墨黑实底白字，仅命中根菜单直接子项。
     EP 会给 title 绑内联 color/background，必须 !important 才能覆盖 */
  .student-course-menu > li.el-menu-item,
  .student-course-menu > li.el-sub-menu > .el-sub-menu__title {
    height: 46px;
    line-height: 46px;
    margin: 0 0 8px;
    border-radius: 8px;
    color: #ffffff !important;
    font-size: 14px;
    font-weight: 600;
    background: #1f2937 !important;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;

    .student-menu-icon { color: #ffffff !important; }

    &:hover,
    &:focus {
      color: #ffffff !important;
      background: #111827 !important;
      outline: none;

      .student-menu-icon { color: #ffffff !important; }
    }
  }

  /* 一级激活（直跳项 / 当前路由所在分组）：深黑底 + 左侧白色引导条 */
  .student-course-menu > li.el-menu-item.is-active,
  .student-course-menu > li.el-sub-menu.is-active > .el-sub-menu__title {
    color: #ffffff !important;
    background: #111827 !important;
    box-shadow: inset 3px 0 0 #ffffff;

    .student-menu-icon { color: #ffffff !important; }

    &:hover,
    &:focus {
      color: #ffffff !important;
      background: #111827 !important;

      .student-menu-icon { color: #ffffff !important; }
    }
  }

  /* 二级列表展开区：白底 */
  .sidebar-container.is-student-nav .el-sub-menu .el-menu {
    background: #ffffff;
  }

  /* 二级菜单项：透明底、hover 浅灰、激活墨黑实底。
     老规则对嵌套项写了 transparent !important（L80-90），背景必须 !important 才能覆盖 */
  .sidebar-container.is-student-nav .el-sub-menu .el-menu-item {
    height: 34px;
    line-height: 34px;
    min-width: auto;
    border-radius: 8px;
    color: #4b5563;
    background: transparent;

    &:hover,
    &:focus {
      background: #f3f4f6 !important;
      color: #111827;
      outline: none;
    }

    &.is-active {
      background: #1f2937 !important;
      color: #ffffff;

      &:hover {
        background: #111827 !important;
        color: #ffffff;
      }
    }

    &.is-disabled,
    &.is-disabled:hover {
      color: #c0c5cd;
      opacity: 1;
      background: transparent !important;
      cursor: default;
    }
  }

  /* 分组折叠箭头：墨黑块上用 70% 白，hover/激活全白；旋转由组件内置 */
  .sidebar-container.is-student-nav .el-sub-menu__icon-arrow {
    color: rgba(255, 255, 255, 0.7) !important;
  }

  .sidebar-container.is-student-nav .el-sub-menu__title:hover .el-sub-menu__icon-arrow,
  .sidebar-container.is-student-nav li.el-sub-menu.is-active .el-sub-menu__icon-arrow {
    color: #ffffff !important;
  }

  /* 菜单图标：16px，与文字间距 8px */
  .sidebar-container.is-student-nav .student-menu-icon {
    margin-right: 8px;
    font-size: 16px;
  }

  /* 折叠把手沿用共享块的边缘定位（!important）；此处仅覆写 hover，
     压过旧 .studentLayout:has(.student-training-shell) 蓝色玻璃 hover */
  .sidebar-container.is-student-nav .course-sidebar-toggle {
    &:hover,
    &:focus-visible {
      border-color: #1f2937;
      background: #1f2937;
      color: #ffffff;
      outline: none;
    }
  }

  /* 64px 图标轨道模式（el-menu collapse 原生支持，二级以弹出层展示） */
  &.hideSidebar .sidebar-container.is-student-nav {
    .student-course-menu {
      box-sizing: border-box;
      width: 64px;
      padding: 12px 8px;
    }

    /* 一级深蓝块在轨道模式下只居中显图标 */
    .student-course-menu > li.el-menu-item,
    .student-course-menu > li.el-sub-menu > .el-sub-menu__title {
      justify-content: center;
      padding: 0;
    }

    .student-menu-icon { margin-right: 0; }

    /* 恢复折叠模式下 sub-menu title 里的 icon 尺寸 ——
       Element Plus 默认把 .hideSidebar 里 sub-menu title 的 <i> 也压成 0 宽高，
       但分组标题在折叠轨道模式下仍需显示图标 */
    .el-menu--collapse .el-sub-menu > .el-sub-menu__title > i.student-menu-icon {
      width: var(--el-menu-icon-width, 24px) !important;
      height: var(--el-menu-icon-width, 24px) !important;
      overflow: visible !important;
      visibility: visible !important;
      display: inline-flex !important;
    }
  }
}

/* ========================================================================
 * 学生端 64px 轨道模式：分组二级弹出层（teleport 到 body，脱离 sidebar 作用域）
 * 通过 el-sub-menu 的 popper-class="student-menu-popper" 锚定换肤
 * ====================================================================== */
.el-popper.student-menu-popper,
.el-menu--popup-container.student-menu-popper {
  padding: 6px;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  box-shadow: 0 6px 20px rgba(17, 24, 39, 0.12);

  .el-menu--popup {
    padding: 0;
    background: #ffffff;
  }

  .el-menu-item {
    height: 34px;
    line-height: 34px;
    border-radius: 8px;
    color: #374151;
    background: transparent;

    &:hover,
    &:focus {
      background: #f3f4f6;
      color: #111827;
      outline: none;
    }

    &.is-active {
      background: #1f2937;
      color: #ffffff;

      &:hover {
        background: #111827;
        color: #ffffff;
      }
    }
  }
}

/* ========================================================================
 * 教师端（role 3）极简 SaaS 教育风：纯白画布 + 教育蓝
 * 覆盖前文 #app .studentLayout, #app .teacherLayout 共享的浅蓝玻璃块
 * 选择器带 .teacherLayout 锚点且置于文件末尾，确保胜出
 * ====================================================================== */
#app .teacherLayout {
  background: #ffffff !important;

  .main-container { background: #ffffff !important; }

  .app-main,
  .teacher-main {
    background: #ffffff !important;

    &::-webkit-scrollbar-track { background: transparent !important; }
    &::-webkit-scrollbar-thumb { background: #d1d5db !important; }
    &::-webkit-scrollbar-thumb:hover { background: #9ca3af !important; }
  }

  // 实训页背景一并收敛为纯白
  .app-main:has(.student-training-shell) { background: #ffffff !important; }

  .sidebar-container {
    background: #ffffff !important;
    border-right: 1px solid #e5e7eb !important;
    box-shadow: none !important;

    &::after { display: none !important; }

    // 导航容器：去掉大圆角玻璃卡片，铺满侧栏
    .student-course-nav {
      width: 100%;
      min-height: 100%;
      margin: 0;
      padding: 16px 10px;
      border: 0;
      border-radius: 0;
      background: #ffffff !important;
      box-shadow: none !important;
      backdrop-filter: none;
    }

    // 分组标题：13px 深灰 700，不再大写拉字距
    .student-course-heading {
      margin: 0 0 8px;
      padding: 0 8px;
      color: #1f2937 !important;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0;
      text-transform: none;

      &:hover { color: #1f2937 !important; }
    }

    .student-course-list { margin: 0 0 16px; }

    // 菜单项：纯文字行、38px 高、8px 圆角
    .student-course-link {
      min-height: 38px;
      margin: 0 0 4px;
      padding: 0 10px;
      border: 0 !important;
      border-radius: 8px !important;
      color: #4b5563 !important;
      background: transparent !important;
      font-size: 13px;
      font-weight: 400;

      &:hover {
        color: #1f2937 !important;
        background: #f3f4f6 !important;
        box-shadow: none !important;
        transform: none !important;
      }

      // 激活：教育蓝浅底 + 蓝字 + 左侧 3px 蓝条
      &.active {
        color: #3b82f6 !important;
        background: #eff6ff !important;
        box-shadow: inset 3px 0 0 #3b82f6;
      }

      &.disabled {
        color: #c0c5cd !important;
        background: transparent !important;
      }
    }

    // 图标：透明底灰图标，hover/激活变色
    .student-course-icon {
      width: 24px;
      height: 24px;
      border: 0 !important;
      border-radius: 6px;
      color: #9ca3af !important;
      background: transparent !important;
      box-shadow: none !important;
    }

    .student-course-icon--heading {
      color: #3b82f6 !important;
      background: #eff6ff !important;
    }

    .student-course-link:hover .student-course-icon { color: #4b5563 !important; }
    .student-course-link.active .student-course-icon { color: #3b82f6 !important; }
  }
}