* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
}

.app-shell {
  max-width: var(--app-maxw);
  margin: 0 auto;
  padding: var(--sp-3);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
  padding: 0 var(--sp-3);
  background: color-mix(in srgb, var(--c-surface) 94%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--c-primary) 28%, var(--c-border));
  backdrop-filter: blur(8px);
}

.brand-row {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

/* Diamond brand badge */
.brand-badge {
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 0;
  transform: rotate(45deg);
  background: linear-gradient(140deg, var(--c-primary), var(--c-primary-2));
  flex-shrink: 0;
}

/* Fantasy font in header */
.app-header strong,
#backroomShopName {
  font-family: var(--font-fantasy);
  font-size: var(--text-lg);
  letter-spacing: 0.05em;
}

.main-grid {
  display: grid;
  gap: var(--sp-3);
}

@media (min-width: 992px) {
  .main-grid.dm-grid {
    grid-template-columns: 1.2fr 1fr 0.8fr;
    align-items: start;
  }
}