.app-shell-root {
      position: fixed;
      top: 0;
      right: 0;
      pointer-events: none;
      z-index: 950;
      display: none;
    }

    html[data-app-shell-mode="host"] .app-shell-root,
    body[data-app-shell-mode="host"] .app-shell-root {
      display: block;
    }

    .app-shell-status {
      display: none;
      position: fixed;
      top: 12px;
      right: 12px;
      max-width: min(68vw, 360px);
      border-radius: 999px;
      border: 1px solid rgba(255, 255, 255, 0.25);
      background: rgba(15, 23, 42, 0.66);
      color: #f8fafc;
      font-size: 12px;
      line-height: 1.2;
      font-weight: 600;
      padding: 8px 12px;
      text-align: right;
      opacity: 0.95;
      backdrop-filter: blur(8px);
      box-shadow: 0 8px 20px rgba(15, 23, 42, 0.25);
    }

    .app-shell-view-host {
      position: fixed;
      inset: 0;
      z-index: 900;
      display: none;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      padding-bottom: var(--sbm-mobile-tabbar-offset, calc(96px + env(safe-area-inset-bottom, 0px)));
    }

    html[data-app-shell-mode="host"] body[data-shared-menu-layout="desktop-top"] .app-shell-view-host {
      padding-top: 0;
      padding-bottom: env(safe-area-inset-bottom, 0px);
    }

    html[data-app-shell-mode="host"] body[data-shared-menu-layout="desktop-top"] .app-shell-view-stack,
    html[data-app-shell-mode="host"] body[data-shared-menu-layout="desktop-top"] .app-shell-view-loading {
      top: var(--sbm-desktop-menu-offset, 78px);
    }

    html[data-app-shell-mode="host"] body[data-app-shell-active-view="non-marathon"] .app-shell-view-host {
      display: block;
    }

    html[data-app-shell-mode="host"] body[data-app-shell-active-view="non-marathon"] .container {
      display: none;
    }

    html[data-app-shell-mode="host"] body[data-app-shell-active-view="non-marathon"][data-app-shell-overlay-open="1"]:not([data-shared-menu-layout="desktop-top"]) {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      width: 100%;
      height: 100dvh;
      min-height: 100dvh;
      display: block;
      padding: 0;
      overflow: hidden;
      overscroll-behavior: none;
    }

    html[data-app-shell-mode="host"] body[data-app-shell-overlay-open="1"]:not([data-shared-menu-layout="desktop-top"]) #shared-burger-menu-root {
      display: none !important;
    }

    html[data-app-shell-mode="host"] body[data-app-shell-overlay-kind="purchases"] #shared-burger-menu-root {
      display: none !important;
    }

    html[data-app-shell-mode="host"] body[data-app-shell-active-view="non-marathon"][data-app-shell-overlay-open="1"]:not([data-shared-menu-layout="desktop-top"]) .app-shell-view-host {
      padding-bottom: 0;
    }

    html[data-app-shell-mode="host"] body[data-app-shell-active-view="non-marathon"][data-app-shell-overlay-open="1"]:not([data-shared-menu-layout="desktop-top"]) .app-shell-view-stack,
    html[data-app-shell-mode="host"] body[data-app-shell-active-view="non-marathon"][data-app-shell-overlay-open="1"]:not([data-shared-menu-layout="desktop-top"]) .app-shell-view-loading {
      bottom: 0;
    }

    html[data-app-shell-mode="host"] body[data-app-shell-overlay-kind="purchases"],
    html[data-app-shell-mode="host"] body[data-app-shell-overlay-kind="curator-assignments"] {
      overflow: hidden;
    }

    .app-shell-view-stack {
      position: absolute;
      top: 0;
      right: 0;
      bottom: var(--sbm-mobile-tabbar-offset, calc(96px + env(safe-area-inset-bottom, 0px)));
      left: 0;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    }

    .app-shell-tab-frame {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      border: 0;
      display: none;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    }

    .app-shell-tab-frame.is-active {
      display: block;
    }

    .app-shell-view-loading {
      position: absolute;
      top: 0;
      right: 0;
      bottom: var(--sbm-mobile-tabbar-offset, calc(96px + env(safe-area-inset-bottom, 0px)));
      left: 0;
      z-index: 5;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 12px;
      color: #ffffff;
      font-size: 15px;
      font-weight: 600;
      text-align: center;
      background: linear-gradient(135deg, rgba(102, 126, 234, 0.74) 0%, rgba(118, 75, 162, 0.76) 100%);
      backdrop-filter: blur(2px);
      pointer-events: auto;
    }

    .app-shell-view-loading[hidden] {
      display: none;
    }

    .app-shell-view-loading-spinner {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      border: 3px solid rgba(255, 255, 255, 0.35);
      border-top-color: #ffffff;
      animation: app-shell-loading-spin 0.9s linear infinite;
    }

    @keyframes app-shell-loading-spin {
      to {
        transform: rotate(360deg);
      }
    }

    .app-shell-purchases-overlay,
    .app-shell-curator-assignments-overlay {
      position: fixed;
      inset: 0;
      z-index: 1300;
      display: flex;
      align-items: stretch;
      justify-content: stretch;
      background: rgba(8, 11, 24, 0.42);
      backdrop-filter: blur(10px);
    }

    .app-shell-purchases-overlay[hidden],
    .app-shell-curator-assignments-overlay[hidden] {
      display: none;
    }

    .app-shell-purchases-overlay-backdrop,
    .app-shell-curator-assignments-overlay-backdrop {
      display: none;
    }

    .app-shell-purchases-overlay-surface,
    .app-shell-curator-assignments-overlay-surface {
      position: relative;
      display: flex;
      flex-direction: column;
      width: 100%;
      height: 100%;
      min-height: 100dvh;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      overflow: hidden;
    }

    .app-shell-purchases-overlay-chrome,
    .app-shell-curator-assignments-overlay-chrome {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      flex: 0 0 auto;
      min-height: calc(58px + env(safe-area-inset-top, 0px));
      padding: env(safe-area-inset-top, 0px) 14px 10px;
      background: linear-gradient(180deg, rgba(30, 41, 82, 0.72) 0%, rgba(20, 26, 49, 0.22) 100%);
      backdrop-filter: blur(16px);
    }

    .app-shell-purchases-overlay-close,
    .app-shell-curator-assignments-overlay-close {
      width: 42px;
      height: 42px;
      border: 1px solid rgba(255, 255, 255, 0.24);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.14);
      color: #ffffff;
      font-size: 24px;
      line-height: 1;
      cursor: pointer;
      transition: background 0.18s ease, transform 0.14s ease;
    }

    .app-shell-purchases-overlay-close:hover,
    .app-shell-purchases-overlay-close:focus-visible,
    .app-shell-curator-assignments-overlay-close:hover,
    .app-shell-curator-assignments-overlay-close:focus-visible {
      background: rgba(255, 255, 255, 0.24);
      outline: none;
    }

    .app-shell-purchases-overlay-close:active,
    .app-shell-curator-assignments-overlay-close:active {
      transform: scale(0.97);
    }

    .app-shell-purchases-overlay-frame,
    .app-shell-curator-assignments-overlay-frame {
      flex: 1 1 auto;
      width: 100%;
      min-height: 0;
      border: 0;
      background: transparent;
    }

    @media (min-width: 921px) {
      .app-shell-purchases-overlay,
      .app-shell-curator-assignments-overlay {
        align-items: center;
        justify-content: center;
        padding: 28px;
        background: rgba(6, 8, 20, 0.56);
      }

      .app-shell-purchases-overlay-backdrop,
      .app-shell-curator-assignments-overlay-backdrop {
        position: absolute;
        inset: 0;
        display: block;
      }

      .app-shell-purchases-overlay-surface,
      .app-shell-curator-assignments-overlay-surface {
        width: min(960px, calc(100vw - 56px));
        height: min(860px, calc(100dvh - 56px));
        min-height: 620px;
        border-radius: 28px;
        border: 1px solid rgba(199, 210, 254, 0.24);
        box-shadow: 0 28px 64px rgba(8, 10, 22, 0.34);
      }

      .app-shell-purchases-overlay-chrome,
      .app-shell-curator-assignments-overlay-chrome {
        min-height: 58px;
        padding: 8px 12px;
        border-bottom: 1px solid rgba(199, 210, 254, 0.16);
      }
    }

    /* Unified menu styles are loaded from /js/shared_burger_menu.js */