/* ------------------------------------------------
   Header — dark brand header
   ------------------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface-dark);
  border-bottom: 1px solid #1a1a1a;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  overflow: hidden;
}

.header-nav {
  display: flex;
  gap: var(--space-6);
}

.header-nav a {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-on-dark-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.header-nav a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* ------------------------------------------------
   Hero / Product section
   ------------------------------------------------ */
.hero {
  padding-block: var(--space-12) var(--space-16);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  align-items: start;
}

.product-gallery {
  position: relative !important;
  z-index: 1;
}

.product-info {
  position: relative;
  z-index: 2;
  background: var(--color-bg);
}

.product-image-main {
  width: 100%;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg-muted);
  box-shadow: var(--shadow-lg);
}

.product-image-main img {
  width: 100%;
  height: auto;
  display: block;
}

.product-title {
  font-size: var(--font-size-3xl);
  margin-top: var(--space-3);
}

/* ------------------------------------------------
   Trust bar — dark section
   ------------------------------------------------ */
.trust-bar {
  padding-block: var(--space-10);
  background: var(--color-surface-dark);
}

.trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

/* ------------------------------------------------
   Footer — dark section
   ------------------------------------------------ */
.site-footer {
  padding-top: var(--space-16);
  padding-bottom: var(--space-8);
  background: var(--color-surface-dark);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
}

/* ------------------------------------------------
   Responsive — Tablet (640px+)
   ------------------------------------------------ */
@media (min-width: 640px) {
  .trust-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .thumb {
    width: 80px;
    height: 80px;
  }
}

/* ------------------------------------------------
   Responsive — Desktop (960px+)
   ------------------------------------------------ */
@media (min-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
  }

  .product-gallery {
    position: sticky !important;
    top: 88px;
  }

  .product-title {
    font-size: var(--font-size-4xl);
  }

  .footer-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}