/* Resource rail. Section is transparent; relies on the main content
   strip for surface. Divider between this and the neighboring
   sections comes from the strip's own rhythm. */
.resource-rail {
  padding-block: clamp(4rem, 8vw, 6rem);
  background-color: transparent;
}

.resource-rail__intro {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 0 0 2.5rem;
}

.resource-rail__eyebrow {
  margin: 0;
  font-size: var(--fs-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-muted-foreground);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.resource-rail__heading {
  margin: 0.25rem 0 0;
  font-size: clamp(1.5rem, 3vw, var(--fs-3xl));
  letter-spacing: var(--tracking-tight);
}

.resource-rail__items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.resource-card {
  display: flex;
}

.resource-card__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-background);
  color: var(--color-foreground);
  box-shadow: 0 1px 2px rgb(16 17 20 / 4%);
  transition:
    transform var(--dur-med) var(--ease),
    box-shadow var(--dur-med) var(--ease),
    border-color var(--dur-fast) var(--ease);
}

/* Brand gradient ring overlay. Sits on top of the neutral border via
   a 1px masked outline that lights up on hover. Uses the mask-composite
   trick so the inner area stays clear. */
.resource-card__link::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: calc(var(--radius-lg) + 1px);
  padding: 1px;
  background: var(--brand-gradient);
  -webkit-mask:
    linear-gradient(#000 0 0) content-box,
    linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur-med) var(--ease);
  pointer-events: none;
}

.resource-card__link:hover,
.resource-card__link:focus-visible {
  transform: translateY(-3px);
  color: var(--color-foreground);
  border-color: transparent;
  outline: none;
  box-shadow:
    0 12px 28px -14px color-mix(in oklch, var(--brand-teal) 55%, transparent),
    0 6px 14px -8px color-mix(in oklch, var(--brand-blue) 30%, transparent),
    0 1px 2px rgb(16 17 20 / 6%);
}
.resource-card__link:hover::after,
.resource-card__link:focus-visible::after {
  opacity: 1;
}

.resource-card__cover {
  --cover-spine: var(--brand-gradient);
  position: relative;
  aspect-ratio: 3 / 4;
  padding: 0.5rem 0.625rem;
  display: flex;
  align-items: stretch;
  justify-content: stretch;
}

/* Tone variants paint the mini-asset's spine, not the cover. The
   cover itself stays a subtle neutral panel so every card reads as
   the same chrome treatment regardless of tone. */
.resource-card__cover--teal      { --cover-spine: var(--brand-teal); }
.resource-card__cover--blue      { --cover-spine: var(--brand-blue); }
.resource-card__cover--teal-blue { --cover-spine: linear-gradient(180deg, var(--brand-teal) 0%, var(--brand-blue) 100%); }
.resource-card__cover--blue-teal { --cover-spine: linear-gradient(180deg, var(--brand-blue) 0%, var(--brand-teal) 100%); }

/* Mini asset: a white paper mockup with a tone-colored spine,
   a tiny kicker, a short display title, and the TWG mark tucked
   in the bottom corner. Reads as a "document" preview at card
   scale while staying performance-light (pure CSS + one 20px SVG). */
.resource-asset {
  position: relative;
  display: flex;
  width: 100%;
  height: 100%;
  background: #fff;
  border: 1px solid color-mix(in oklch, var(--color-foreground) 6%, transparent);
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow:
    0 1px 0 rgb(255 255 255 / 70%) inset,
    0 6px 14px -10px rgb(16 17 20 / 22%),
    0 2px 4px rgb(16 17 20 / 6%);
  transition: transform var(--dur-med) var(--ease);
}
.resource-card__link:hover .resource-asset,
.resource-card__link:focus-visible .resource-asset {
  transform: translateY(-2px);
}

.resource-asset__spine {
  flex: 0 0 0.5rem;
  background: var(--cover-spine);
  box-shadow:
    inset -1px 0 0 rgb(0 0 0 / 8%),
    1px 0 0 rgb(255 255 255 / 60%);
}

.resource-asset__body {
  position: relative;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.75rem 0.75rem 0.625rem;
  min-width: 0;
  color: var(--on-light-foreground);
}

.resource-asset__kicker {
  font-family: var(--font-mono, var(--font-text));
  font-size: 0.5625rem;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--on-light-muted-foreground);
}

.resource-asset__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(0.8125rem, 1vw + 0.375rem, 1rem);
  font-weight: var(--font-weight-display);
  letter-spacing: -0.015em;
  line-height: 1.15;
  color: var(--on-light-foreground);
  text-wrap: balance;

  /* Clamp to 4 lines at the compact card scale so long titles don't
     push the mark off the bottom of the asset. */
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 4;
  overflow: hidden;
}

.resource-asset__mark {
  margin-top: auto;
  align-self: flex-start;
  width: 1.125rem;
  height: auto;
  opacity: 0.8;
  transition:
    transform var(--dur-med) var(--ease),
    opacity var(--dur-fast) var(--ease);
}
.resource-card__link:hover .resource-asset__mark,
.resource-card__link:focus-visible .resource-asset__mark {
  transform: translateY(-1px);
  opacity: 1;
}

.resource-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  margin-top: auto;
  padding-top: 0.25rem;
  font-size: var(--fs-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-foreground);
  transition: color var(--dur-fast) var(--ease);
}
.resource-card__cta .icon {
  transition: transform var(--dur-fast) var(--ease);
}
.resource-card__link:hover .resource-card__cta,
.resource-card__link:focus-visible .resource-card__cta {
  color: var(--brand-teal);
}
.resource-card__link:hover .resource-card__cta .icon,
.resource-card__link:focus-visible .resource-card__cta .icon {
  transform: translateX(3px);
}

@media (max-width: 960px) {
  .resource-rail__items { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 540px) {
  .resource-rail__items { grid-template-columns: 1fr; }
}