/* ============================================================
   桌面 / 平板版面 (>= 769px)
   採用左側固定側邊欄的電商後台版型
   ============================================================ */

@media (min-width: 769px) {
  body {
    background: var(--bg);
  }

  /* ---------- 上方導覽列 ---------- */
  .top-nav {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 40;
    box-shadow: var(--shadow);
    overflow: visible;
  }

  .top-nav-inner {
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 12px 24px;
    max-width: 1440px;
    margin: 0 auto;
  }

  .brand-block {
    flex: 0 0 auto;
    padding: 0;
    border-bottom: none;
    font-size: 1.02rem;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
    font-size: 1.08rem;
  }

  .menu-mobile-toggle {
    display: none;
  }

  .menu-list {
    flex: 1 1 auto;
    padding: 0;
    overflow: visible;
  }

  .menu-groups {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 14px;
    flex-wrap: wrap;
  }

  .menu-group {
    position: relative;
    flex: 0 0 auto;
  }

  .menu-group-toggle {
    width: auto;
    padding: 10px 16px;
    border-radius: 0;
    font-size: 0.93rem;
    font-weight: 700;
    /*background: rgba(255, 255, 255, 0.04);*/
    border: 1px solid transparent;
  }

  .menu-group-toggle::after {
    margin-left: 12px;
  }

  .menu-group-toggle:hover,
  .menu-group.open > .menu-group-toggle {
    background: var(--sidebar-bg-light);
    border-color: var(--sidebar-border);
    border-radius: 10px;
  }

  .menu-group-items {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    left: auto;
    min-width: 220px;
    max-width: min(320px, calc(100vw - 40px));
    padding: 10px;
    margin-top: 0;
    display: none;
    flex-direction: column;
    gap: 4px;
    background: var(--sidebar-bg);
    border: 1px solid var(--sidebar-border);
    border-radius: 14px;
    box-shadow: var(--shadow);
    z-index: 60;
  }

  .menu-group.open > .menu-group-items {
    display: flex;
  }

  .menu-item {
    padding: 10px 12px;
    border-radius: 10px;
    font-size: 0.9rem;
  }

  /* ---------- 內容區 ---------- */
  .top-nav ~ .page-shell {
    margin-left: 0;
    margin-right: auto;
    max-width: 1440px;
    padding-top: 24px;
  }

  .page-shell {
    padding: 28px 32px 70px;
  }

  .card {
    padding: 30px;
  }

  .card.wide {
    padding: 36px 40px;
  }

  .brand {
    margin-bottom: 22px;
  }

  .brand h1 {
    margin: 0;
    font-size: 1.9rem;
  }

  .brand p {
    margin: 0;
    color: var(--muted);
  }

  .page-header h1,
  .page-header h2 {
    font-size: 1.7rem;
    margin: 0;
  }

  .intro-panel {
    padding: 18px 20px;
    margin-bottom: 22px;
    border-radius: var(--radius);
  }

  .filter-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }

  .grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .grid .card {
    height: 100%;
  }
}