/* Resource index: 3-up grid of linked article cards for the hub.
   Reuses the resource-card hover vocabulary (lift + brand-gradient ring)
   so it reads as a sibling of the home-page resource-rail. */
.resource-index {
  padding-block: clamp(3rem, 6vw, 5rem);
}

.resource-index__intro {
  max-width: 56rem;
  margin: 0 0 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.resource-index__heading {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3.4vw, 2.75rem);
  font-weight: var(--font-weight-display);
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0;
  color: var(--color-foreground);
}

.resource-index__deck {
  margin: 0;
  font-size: var(--fs-lg);
  color: var(--color-muted-foreground);
  max-width: 52ch;
  line-height: 1.45;
}

.resource-index__items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.resource-index__card { display: flex; }

/* --- Card link ------------------------------------------------------ */

.resource-index__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  width: 100%;
  padding: 1.75rem;
  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 that lights up on hover (mask-composite
   trick, identical to .resource-card). */
.resource-index__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-index__link:hover,
.resource-index__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-index__link:hover::after,
.resource-index__link:focus-visible::after {
  opacity: 1;
}

/* --- Card content --------------------------------------------------- */

.resource-index__tag {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--brand-teal);
  background: color-mix(in oklch, var(--brand-teal) 8%, transparent);
  border: 1px solid color-mix(in oklch, var(--brand-teal) 22%, transparent);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.5rem;
}

.resource-index__title {
  margin: 0;
  font-size: var(--fs-lg);
  font-weight: var(--font-weight-display);
  letter-spacing: -0.015em;
  line-height: 1.25;
  color: var(--color-foreground);
}

.resource-index__excerpt {
  margin: 0;
  color: var(--color-muted-foreground);
  line-height: var(--lh-normal);
}

.resource-index__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.02em;
  color: var(--color-muted-foreground);
}

.resource-index__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  margin-top: auto;
  padding-top: 0.5rem;
  font-size: var(--fs-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-foreground);
  transition: color var(--dur-fast) var(--ease);
}
.resource-index__cta .icon {
  transition: transform var(--dur-fast) var(--ease);
}
.resource-index__link:hover .resource-index__cta,
.resource-index__link:focus-visible .resource-index__cta {
  color: var(--brand-teal);
}
.resource-index__link:hover .resource-index__cta .icon,
.resource-index__link:focus-visible .resource-index__cta .icon {
  transform: translateX(3px);
}

/* --- Responsive ----------------------------------------------------- */

@media (max-width: 960px) {
  .resource-index__items { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .resource-index__items { grid-template-columns: 1fr; }
}