/* Global base + reusable utilities shared by every page */
html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-main);
  color: var(--color-body-text);
  background-color: var(--color-page-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, video, svg { max-width: 100%; height: auto; }

/* Mobile: avoid iOS zoom on focus */
@media (max-width: 639px) {
  input, select, textarea { font-size: 16px !important; }
}

/* Navigation link hover underline */
.nav-link {
  position: relative;
  transition: color 0.2s ease;
  white-space: nowrap;
}
.nav-link::after {
  content: '';
  position: absolute;
  width: 0%;
  height: 2px;
  bottom: -4px;
  left: 0;
  background: linear-gradient(90deg, var(--blue), var(--tech-cyan-400));
  border-radius: 2px;
  transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
.nav-link:hover::after { width: 100%; }

/* Blueprint grid backgrounds */
.blueprint-pattern {
  background-size: 28px 28px;
  background-image:
    linear-gradient(to right, var(--grid-navy-04) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-navy-04) 1px, transparent 1px);
}
.blueprint-pattern-dense {
  background-size: 20px 20px;
  background-image:
    linear-gradient(to right, var(--grid-blue-05) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-blue-05) 1px, transparent 1px);
}
.blueprint-dark-pattern {
  background-size: 32px 32px;
  background-image:
    linear-gradient(to right, var(--grid-cyan-05) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-cyan-05) 1px, transparent 1px);
}
.blueprint-grid {
  background-size: 24px 24px;
  background-image:
    linear-gradient(to right, var(--grid-navy-05) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-navy-05) 1px, transparent 1px);
}
.blueprint-dark-grid {
  background-size: 28px 28px;
  background-image:
    linear-gradient(to right, var(--grid-cyan-07) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-cyan-07) 1px, transparent 1px);
}

/* Card elevation */
.card-hover {
  transition: transform 0.25s var(--ease-card), box-shadow 0.25s var(--ease-card), border-color 0.25s ease;
}
.card-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

/* Selected states (product thumbnails, payment tabs) */
.thumb-active {
  border-color: var(--brand-navy-900) !important;
  box-shadow: 0 0 0 2px var(--focus-ring-navy);
}
.payment-tab-active {
  border-color: var(--brand-navy-900) !important;
  background-color: var(--color-selected-bg) !important;
  color: var(--brand-navy-900) !important;
}