.app-shell {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  min-height: 100vh;
}
.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  background: var(--panel2);
  border-inline-end: 1px solid var(--line);
  padding: 18px 12px;
}
.brand { display: flex; flex-direction: column; padding: 0 10px 18px; }
.brand b { font-size: 19px; }
.brand small { color: var(--muted); }
nav { display: grid; gap: 5px; }
nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 8px;
}
nav a:hover, nav a.active { background: var(--panel); color: #fff; }
nav .nav-admin {
  margin-top: 12px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}
.workspace { min-width: 0; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 14px;
  background: rgba(15, 23, 42, .95);
  border-bottom: 1px solid var(--line);
  padding: 12px 18px;
}
.topbar h1 { font-size: 20px; margin: 0; }
.topbar p { margin: 2px 0 0; color: var(--muted); font-size: 12px; }
.user-tools {
  margin-inline-start: auto;
  display: flex;
  gap: 7px;
  align-items: center;
  flex-wrap: wrap;
}
.icon-btn { display: none; }
main { padding: 18px; max-width: 1600px; width: 100%; margin: auto; }
.page-actions, .filters, .form-row, .actions, .tabs {
  display: flex;
  gap: 8px;
  align-items: end;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.stats, .cards, .store-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
  margin-bottom: 14px;
}

@media (max-width: 850px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    width: 240px;
    z-index: 40;
    transform: translateX(110%);
    transition: .2s;
  }
  .sidebar.open { transform: none; }
  .icon-btn { display: block; }
  .topbar { align-items: flex-start; }
  .user-tools span { display: none; }
  main { padding: 12px; }
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cards { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .topbar {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    padding: 10px;
  }
  .topbar p { display: none; }
  .user-tools {
    grid-column: 1 / -1;
    width: 100%;
    margin: 2px 0 0;
    justify-content: flex-end;
  }
  .user-tools button { padding: 5px 8px; font-size: 12px; }
  main { padding: 9px; }
  .page-actions, .filters, .form-row, .actions, .tabs { align-items: stretch; }
}