.shell {
      min-height: 100vh;
      display: grid;
      grid-template-columns: 244px minmax(0, 1fr);
      transition: grid-template-columns 160ms ease;
    }

    .sidebar {
      position: sticky;
      top: 0;
      display: flex;
      flex-direction: column;
      height: 100vh;
      overflow: auto;
      padding: 16px 12px;
      border-right: 1px solid var(--line);
      background: #fff;
    }

    .sidebar-collapse-button {
      position: absolute;
      top: 18px;
      right: 10px;
      z-index: 1;
      display: grid;
      place-items: center;
      width: 28px;
      height: 28px;
      padding: 0;
      border: 1px solid var(--line);
      border-radius: 5px;
      background: #fff;
      color: #667085;
      cursor: pointer;
    }

    .sidebar-collapse-button:hover { background: #f5f7fa; color: #344054; }
    .sidebar-collapse-button svg { width: 14px; height: 14px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; transition: transform 160ms ease; }

    .shell.sidebar-collapsed { grid-template-columns: 44px minmax(0, 1fr); }
    .shell.sidebar-collapsed .sidebar { overflow: hidden; padding: 16px 7px; }
    .shell.sidebar-collapsed .sidebar > :not(.sidebar-collapse-button) { display: none; }
    .shell.sidebar-collapsed .sidebar-collapse-button { right: 7px; }
    .shell.sidebar-collapsed .sidebar-collapse-button svg { transform: rotate(180deg); }

    .brand {
      display: grid;
      gap: 6px;
      padding: 2px 8px 16px;
      border-bottom: 1px solid var(--line);
    }

    .brand img,
    .brand-logo {
      width: 178px;
      height: auto;
      display: block;
    }

    .brand h1,
    .brand strong {
      display: block;
      margin: 0;
      font-size: 13px;
      line-height: 1.2;
    }

    .brand span {
      display: block;
      color: var(--muted);
      font-size: 11px;
      font-weight: 600;
      margin-top: 0;
    }

    .nav-title {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: calc(100% - 16px);
      margin: 16px 8px 6px;
      padding: 0;
      border: 0;
      background: transparent;
      color: #8a94a3;
      cursor: pointer;
      font: inherit;
      font-size: 9px;
      font-weight: 700;
      text-align: left;
      text-transform: uppercase;
    }

    .nav-title:hover { color: #475467; }
    .nav-title:focus-visible { outline: 2px solid #84adff; outline-offset: 4px; }

    .nav-list {
      display: grid;
      gap: 3px;
    }

    .nav-list[hidden] { display: none; }

    .sidebar > .section-nav > .nav-item {
      width: calc(100% - 12px);
      margin-left: 12px;
    }

    .sidebar > .api-nav > .nav-group-title {
      margin-left: 21px;
    }

    .sidebar > .api-nav > .nav-item {
      width: calc(100% - 24px);
      margin-left: 24px;
    }

    .nav-group-title {
      margin: 12px 8px 3px;
      color: var(--subtle);
      font-size: 10px;
      font-weight: 700;
      letter-spacing: .04em;
      text-transform: uppercase;
    }

    .nav-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      width: 100%;
      min-width: 0;
      height: auto;
      min-height: 34px;
      border: 1px solid transparent;
      background: transparent;
      border-radius: 6px;
      padding: 7px 8px;
      cursor: pointer;
      color: #344054;
      text-align: left;
      text-decoration: none;
      font: inherit;
      font-size: 14px;
      font-weight: 400;
      appearance: none;
      -webkit-appearance: none;
    }

    .nav-item:hover { background: #f5f7fa; }
    .nav-item.active { border-color: #cddbf7; background: #eef4ff; color: #1849a9; font-weight: 650; }
    .nav-item.placeholder { cursor: default; }
    .nav-item.placeholder:hover { border-color: transparent; background: transparent; }

    .nav-caret {
      width: 0;
      height: 0;
      border-top: 4px solid transparent;
      border-bottom: 4px solid transparent;
      border-left: 5px solid currentColor;
      transition: transform 120ms ease;
    }
    .nav-toggle[aria-expanded="true"] .nav-caret { transform: rotate(90deg); }
    .badge {
      border-radius: 4px;
      border: 1px solid var(--line);
      color: var(--muted);
      font-size: 9px;
      font-weight: 700;
      padding: 2px 6px;
      text-transform: uppercase;
      white-space: nowrap;
    }

    .sidebar-footer {
      display: grid;
      gap: 8px;
      margin-top: auto;
      padding: 16px 2px 0;
    }

    .shell > .sidebar .timezone-select {
      width: 100%;
      height: 34px;
      min-height: 34px;
      max-height: 34px;
      box-sizing: border-box;
      padding: 5px 34px 5px 8px;
      border: 1px solid var(--line);
      border-radius: 5px;
      color: #475467;
      background-color: #fff;
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      font-size: 11px;
      font-weight: 400;
      line-height: 1.2;
      letter-spacing: normal;
      text-transform: none;
    }

    .shell > .sidebar .timezone-select option {
      font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      font-size: 11px;
      font-weight: 400;
    }

    .live-state {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      width: 100%;
      height: 34px;
      box-sizing: border-box;
      padding: 0 9px;
      border: 1px solid var(--line);
      border-radius: 5px;
      background: #fff;
      color: var(--muted);
      font-size: 11px;
      white-space: nowrap;
    }

    .live-dot {
      width: 7px;
      height: 7px;
      border-radius: 50%;
      background: #15803d;
      box-shadow: 0 0 0 3px #dcfce7;
    }

    .live-dot.error {
      background: #b42318;
      box-shadow: 0 0 0 3px #fee4e2;
    }

    @media (max-width: 900px) {
      .shell {
        grid-template-columns: 1fr;
      }

      .sidebar {
        position: relative;
        height: auto;
        padding: 12px 14px;
        border-right: 0;
        border-bottom: 1px solid var(--line);
      }

      .sidebar-collapse-button { top: 14px; right: 14px; }
      .shell.sidebar-collapsed { grid-template-columns: 1fr; }
      .shell.sidebar-collapsed .sidebar { height: 52px; padding: 12px 14px; }
      .shell.sidebar-collapsed .sidebar-collapse-button { right: 14px; }

      .brand { padding: 2px 4px 12px; }
      .sidebar > .nav-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
      .sidebar > .api-nav { grid-template-columns: 1fr; }
      .nav-group-title { grid-column: 1 / -1; }
      .sidebar-footer {
        grid-template-columns: repeat(2, minmax(0, max-content));
        align-items: center;
        margin-top: 12px;
        padding-top: 0;
      }
    }

    @media (max-width: 640px) {
      .sidebar > .nav-list {
        grid-template-columns: 1fr;
      }

      .sidebar-footer {
        grid-template-columns: 1fr;
      }
    }