:root {
  --product-shell-field: #01091f;
  --product-shell-text: #f7fbff;
  --product-shell-muted: #9db4c9;
  --product-shell-mint: #5ff0c3;
  --product-shell-line: rgba(162, 197, 226, 0.16);
}

.app-header.product-shell-header {
  position: sticky;
  z-index: 40;
  top: 0;
  display: grid;
  width: 100%;
  min-height: 5.8rem;
  grid-template-columns: minmax(15rem, 1fr) auto minmax(12rem, 1fr);
  align-items: center;
  gap: clamp(1rem, 3vw, 3rem);
  margin: 0;
  padding: max(0.75rem, env(safe-area-inset-top)) clamp(1rem, 3vw, 2.5rem) 0.8rem;
  border-bottom: 1px solid var(--product-shell-line);
  background: rgba(1, 9, 31, 0.86);
  backdrop-filter: blur(20px);
}

.product-brand {
  display: inline-flex;
  min-width: 0;
  min-height: 3.6rem;
  align-items: center;
  gap: 0.8rem;
  color: var(--product-shell-text);
  text-decoration: none;
}

.product-brand-icon {
  display: block;
  width: 3.45rem;
  height: 3.45rem;
  flex: 0 0 auto;
  object-fit: contain;
  filter: drop-shadow(0 0 1rem rgba(95, 240, 195, 0.18));
}

.product-brand-name {
  min-width: 0;
  color: var(--product-shell-text);
  font-size: clamp(1.18rem, 1.8vw, 1.42rem);
  font-weight: 850;
  letter-spacing: -0.045em;
  line-height: 1;
  white-space: nowrap;
}

.product-brand-name .brand-ai {
  color: var(--product-shell-mint);
  font-size: 1.08em;
  letter-spacing: -0.06em;
}

.product-brand-name .brand-tennis {
  font: inherit;
  letter-spacing: inherit;
}

.product-motto {
  margin: 0;
  color: var(--product-shell-text);
  font-size: clamp(0.94rem, 1.4vw, 1.12rem);
  font-weight: 760;
  letter-spacing: -0.025em;
  text-align: center;
}

.product-shell-meta {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: flex-end;
  gap: 0.8rem;
}

.product-shell-section {
  color: var(--product-shell-mint);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  white-space: nowrap;
}

.product-shell-status[hidden] {
  display: none !important;
}

@media (max-width: 48rem) {
  .app-header.product-shell-header {
    min-height: 6.8rem;
    grid-template-areas:
      "brand brand"
      "motto meta";
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.25rem 0.75rem;
    padding-inline: 0.85rem;
  }

  .product-brand {
    grid-area: brand;
    gap: 0.62rem;
  }

  .product-brand-icon {
    width: 2.85rem;
    height: 2.85rem;
  }

  .product-brand-name {
    font-size: clamp(1rem, 4.1vw, 1.16rem);
  }

  .product-motto {
    grid-area: motto;
    align-self: start;
    font-size: 0.92rem;
    text-align: left;
  }

  .product-shell-meta {
    grid-area: meta;
  }

  .product-shell-section {
    font-size: 0.66rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .product-brand-icon {
    filter: none;
  }
}