.app-shell {
  width: min(1540px, 100%);
  min-height: 100vh;
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 0 18px;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  border-radius: 8px;
  background: var(--ink);
  border: 1px solid rgb(255 255 255 / 22%);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.brand-mark img {
  display: block;
  width: 58px;
  height: 58px;
}

.topbar-actions {
  display: grid;
  min-width: 190px;
  gap: 6px;
}

.workspace {
  display: grid;
  grid-template-columns: 278px minmax(0, 1fr) 370px;
  gap: 18px;
  align-items: start;
}

.filters-panel,
.source-strip,
.catalog-panel,
.selection-panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgb(255 255 255 / 92%);
  box-shadow: var(--soft-shadow);
  backdrop-filter: blur(16px);
}

.source-strip {
  display: grid;
  grid-template-columns: minmax(210px, 300px) 1fr;
  gap: 18px;
  align-items: center;
  margin-bottom: 18px;
  padding: 16px;
}

.filters-panel,
.selection-panel {
  position: sticky;
  top: 18px;
  display: grid;
  gap: 20px;
  padding: 16px;
}

.catalog-panel {
  min-width: 0;
  padding: 18px;
}

.catalog-header,
.panel-heading,
.stats-row,
.action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.catalog-header {
  padding-bottom: 16px;
}

.panel-heading span,
.stats-row span {
  color: var(--muted);
  font-size: 0.8rem;
}

.search-wrap {
  display: grid;
  gap: 7px;
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(245px, 1fr));
  gap: 14px;
}

@media (max-width: 1120px) {
  .workspace {
    grid-template-columns: 245px minmax(0, 1fr);
  }

  .selection-panel {
    position: static;
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .app-shell {
    padding: 14px;
  }

  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .source-strip {
    grid-template-columns: 1fr;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .filters-panel {
    position: static;
  }

  .app-grid {
    grid-template-columns: 1fr;
  }
}