.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: auto;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  z-index: 30;
}

.sidebar-brand {
  font-weight: 700;
  color: var(--color-text);
}

.sidebar-nav {
  display: grid;
  gap: var(--space-1);
}

.nav-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text);
}

.nav-link:hover,
.nav-link.is-active {
  background: color-mix(in srgb, var(--color-primary) 12%, var(--color-surface));
  text-decoration: none;
}

.sidebar-footer {
  margin-top: auto;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.app-main {
  min-width: 0;
  padding: var(--space-4) var(--space-5) calc(var(--space-6) + 56px);
}

.topbar {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  min-height: var(--topbar-height);
  margin-bottom: var(--space-4);
}

.topbar-toggle {
  display: none;
}

.topbar-search {
  flex: 1;
  position: relative;
}

.topbar-search input {
  width: 100%;
  min-height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 0 var(--space-3);
}

.search-suggest {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 4px);
  z-index: 40;
}

.mobile-nav {
  display: none;
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2);
  z-index: 20;
}

.mobile-nav a {
  flex: 1;
  text-align: center;
  padding: var(--space-2);
  color: var(--color-text-muted);
  font-size: 0.75rem;
}

.sidebar-backdrop {
  display: none;
}

.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: var(--space-5);
}

.auth-card {
  width: min(420px, 100%);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
}

.sticky-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

.picking-screen .barcode-input {
  min-height: 48px;
  font-size: 1.125rem;
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0 var(--space-3);
  background: var(--color-surface);
  color: var(--color-text);
}

.picking-line {
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-3);
}

.field-error {
  color: var(--color-danger);
  font-size: 0.85rem;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-2);
}

.tabs a {
  color: var(--color-text-muted);
}

.issue-banner {
  border: 1px solid color-mix(in srgb, var(--color-danger) 40%, var(--color-border));
  background: color-mix(in srgb, var(--color-danger) 8%, var(--color-surface));
  color: var(--color-text);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}


@media (max-width: 960px) {
  html,
  body {
    max-width: 100%;
    overflow-x: clip;
  }

  .app-shell {
    grid-template-columns: 1fr;
    max-width: 100vw;
    overflow-x: clip;
  }

  .app-main {
    max-width: 100%;
    overflow-x: clip;
    padding-left: var(--space-3);
    padding-right: var(--space-3);
  }

  .page-header,
  .page-actions {
    flex-wrap: wrap;
  }

  .data-table {
    display: block;
    width: 100%;
    overflow-x: auto;
  }

  .topbar-toggle {
    display: inline-flex;
  }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(280px, 86vw);
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    box-shadow: var(--shadow-md);
    visibility: hidden;
  }

  .sidebar.is-open {
    transform: translateX(0);
    visibility: visible;
  }

  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(16, 24, 32, 0.45);
    border: 0;
    z-index: 25;
  }

  .mobile-nav {
    display: flex;
  }

  .sticky-actions {
    position: sticky;
    bottom: 64px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    z-index: 15;
  }
}