:root {
  --app-bg: #f4f6f9;
  --app-panel: #ffffff;
  --app-border: #dfe5ee;
  --app-muted: #6c7584;
  --app-dark: #111827;
  --app-sidebar: #101827;
  --app-sidebar-soft: #182235;
  --app-primary: #0d6efd;
}

* { box-sizing: border-box; }
body { background: var(--app-bg); color: #1f2937; }
code { user-select: all; color: #c7254e; }

.app-shell { min-height: 100vh; display: flex; }
.app-sidebar {
  width: 270px;
  min-height: 100vh;
  position: sticky;
  top: 0;
  align-self: flex-start;
  background: linear-gradient(180deg, var(--app-sidebar), #0b1220);
  color: #fff;
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  box-shadow: 8px 0 24px rgba(15, 23, 42, .08);
}
.app-brand { display: flex; align-items: center; gap: 12px; padding: 8px 8px 14px; border-bottom: 1px solid rgba(255,255,255,.08); }
.app-brand-mark { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; background: #0d6efd; font-weight: 800; font-size: 1.25rem; }
.app-brand strong { display: block; line-height: 1.15; }
.app-brand small { display: block; color: rgba(255,255,255,.62); margin-top: 2px; }
.app-nav { display: grid; gap: 6px; }
.app-nav-link { color: rgba(255,255,255,.76); text-decoration: none; padding: 10px 12px; border-radius: 10px; display: flex; align-items: center; justify-content: space-between; font-weight: 600; }
.app-nav-link:hover { color: #fff; background: rgba(255,255,255,.08); }
.app-nav-link.active { color: #fff; background: var(--app-sidebar-soft); box-shadow: inset 3px 0 0 #0d6efd; }
.app-sidebar-footer { margin-top: auto; padding-top: 12px; border-top: 1px solid rgba(255,255,255,.08); }

.app-main { flex: 1; min-width: 0; }
.app-topbar { height: 70px; background: rgba(255,255,255,.86); backdrop-filter: blur(8px); border-bottom: 1px solid var(--app-border); display: flex; align-items: center; justify-content: space-between; padding: 0 28px; position: sticky; top: 0; z-index: 1020; }
.app-topbar strong { display: block; font-size: 1.1rem; }
.app-kicker { display: block; color: var(--app-muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; font-weight: 700; }
.app-content { padding: 26px 28px 40px; max-width: 1680px; margin: 0 auto; }
.app-content > .d-flex:first-child h1 { font-size: 1.55rem; margin: 0; }
.app-content > .d-flex:first-child { align-items: center; }
.app-content > .d-flex:first-child .btn-secondary { background: #fff; color: #344054; border-color: var(--app-border); }

.card { border: 1px solid var(--app-border); border-radius: 16px; box-shadow: 0 8px 24px rgba(15, 23, 42, .04); }
.card.card-body { padding: 20px; }
.app-alert, .alert { border-radius: 14px; border-width: 1px; }
.list-group { border-radius: 16px; overflow: hidden; box-shadow: 0 8px 24px rgba(15,23,42,.04); }
.list-group-item { border-color: var(--app-border); padding: 14px 16px; font-weight: 600; }

.table { background: #fff; border-color: var(--app-border); margin-bottom: 0; }
.table thead th { background: #f8fafc; color: #344054; font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; border-bottom: 1px solid var(--app-border); white-space: nowrap; }
.table tbody td { vertical-align: middle; }
.table-responsive, .app-table-card { border: 1px solid var(--app-border); border-radius: 16px; overflow: hidden; background: #fff; box-shadow: 0 8px 24px rgba(15,23,42,.04); }
.app-table-card .table { border: 0; }
.badge { font-weight: 700; }

.btn { border-radius: 10px; font-weight: 600; }
.btn-sm { border-radius: 9px; }
.form-control, .form-select { border-radius: 10px; border-color: #cfd6e1; }
.form-control:focus, .form-select:focus { box-shadow: 0 0 0 .2rem rgba(13,110,253,.12); }

.app-stat-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin-bottom: 18px; }
.app-stat-card { background: #fff; border: 1px solid var(--app-border); border-radius: 16px; padding: 16px; box-shadow: 0 8px 24px rgba(15,23,42,.04); }
.app-stat-label { color: var(--app-muted); font-size: .82rem; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; }
.app-stat-value { font-size: 1.55rem; font-weight: 800; margin-top: 4px; }

.catalog-store-card { background: #fff; border: 1px solid var(--app-border); border-radius: 18px; padding: 18px; box-shadow: 0 8px 24px rgba(15,23,42,.04); }
.catalog-store-title { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.catalog-store-title h2 { font-size: 1.05rem; margin: 0; }
.catalog-meta { color: var(--app-muted); font-size: .9rem; }
.catalog-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.progress { height: 9px; border-radius: 999px; background: #e8edf5; }
.progress-bar { border-radius: 999px; }

.modal-content { border: 0; border-radius: 18px; box-shadow: 0 22px 70px rgba(15, 23, 42, .3); overflow: hidden; }
.modal-header { background: #f8fafc; border-bottom-color: var(--app-border); }
.modal-footer { background: #f8fafc; border-top-color: var(--app-border); }
.modal-body { background: #fff; }
.products-modal .modal-dialog { max-width: min(1420px, 96vw); }
.products-filter-bar { background: #f8fafc; border-bottom: 1px solid var(--app-border); padding: 16px; position: sticky; top: 0; z-index: 2; }
.product-table th, .product-table td { white-space: nowrap; }
.product-name-cell { min-width: 320px; white-space: normal !important; }
.product-sku-cell { max-width: 200px; overflow: hidden; text-overflow: ellipsis; }
.product-status { display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px; border-radius: 999px; font-size: .78rem; font-weight: 700; background: #eef2ff; color: #3730a3; }
.product-stock-instock { background: #e8f7ef; color: #11633d; }
.product-stock-outofstock { background: #fff1f2; color: #9f1239; }
.product-stock-onbackorder { background: #fff7ed; color: #9a3412; }

@media (max-width: 991.98px) {
  .app-shell { display: block; }
  .app-sidebar { position: fixed; z-index: 1040; inset: 0 auto 0 0; transform: translateX(-100%); transition: transform .2s ease; }
  body.sidebar-open .app-sidebar { transform: translateX(0); }
  .app-topbar { padding: 0 16px; }
  .app-content { padding: 18px 14px 34px; }
  .app-stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 575.98px) {
  .app-stat-grid { grid-template-columns: 1fr; }
  .catalog-actions { display: grid; grid-template-columns: 1fr; }
  .catalog-actions .form-select, .catalog-actions .btn { width: 100% !important; }
}