/* ==========================================================================
   Thought Leadership — resource library. Shares .filter-btn / toolbar
   patterns from projects.css; adds the featured resource banner and
   resource card grid.
   ========================================================================== */

.resource-featured {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--color-navy-800), var(--color-navy-950));
  padding: var(--space-2xl) var(--space-xl);
  margin-bottom: var(--space-2xl);
}

.resource-featured::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url('../images/blueprint-grid.svg');
  background-size: 96px 96px;
  opacity: 0.14;
}

.resource-featured__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: var(--space-xl);
  align-items: center;
}

.resource-featured__inner {
  max-width: 62ch;
}

.resource-featured__media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  aspect-ratio: 16 / 10;
  background: linear-gradient(155deg, var(--color-navy-700), var(--color-navy-950));
}

.resource-featured__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.resource-featured__media--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
}

.resource-featured__media--placeholder::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 220%;
  height: 220%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(0, 245, 160, 0.16), transparent 60%);
}

.resource-featured__media-chip {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px dashed var(--border-subtle);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  white-space: nowrap;
  background: rgba(6, 15, 34, 0.5);
}

.resource-featured__kicker {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

.resource-featured__kicker span:first-child {
  color: var(--accent);
}

.resource-featured__title {
  font-size: var(--text-h1);
  max-width: 20ch;
}

.resource-featured__excerpt {
  margin-top: var(--space-md);
  font-size: var(--text-lead);
  font-weight: 500;
  color: var(--text-muted);
  max-width: 56ch;
}

.resource-featured__actions {
  margin-top: var(--space-lg);
}

.resource-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-md);
  /* Lets a single-column card (see below) backfill a gap left by the
     2-column pair when it doesn't fit the remaining columns in its row,
     instead of leaving that cell visibly empty. */
  grid-auto-flow: dense;
}

/* A joined pair of related cards (e.g. an article + its companion
   downloadable resource — see RESOURCE_CARD_PAIRS in js/main.js). Uses
   subgrid so its two cards inherit the exact same column tracks as every
   other card in the grid — same width, same everything — rather than
   splitting its own full-row width in two, which is what previously made
   the pair look like an oversized featured block instead of two normal
   cards. */
.resource-pair {
  grid-column: span 2;
  display: grid;
  grid-template-columns: subgrid;
  gap: var(--space-md);
}

@media (max-width: 700px) {
  .resource-pair {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }
}

.resource-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  background: var(--color-navy-900);
  overflow: hidden;
  transition: border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}

.resource-card:hover,
.resource-card:focus-within {
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

/* ---- Visual/thumbnail area — real cover art when available, otherwise a
   clearly labeled placeholder (same "blueprint + dashed chip" language
   used for project cards), never generic stock photography. ---- */
.resource-card__visual {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(155deg, var(--color-navy-800), var(--color-navy-950));
  border-bottom: 1px solid var(--border-subtle);
}

.resource-card__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-med) var(--ease-out);
}

.resource-card:hover .resource-card__visual img {
  transform: scale(1.04);
}

.resource-card__visual--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
}

.resource-card__visual--placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url('../images/blueprint-grid.svg');
  background-size: 56px 56px;
  opacity: 0.28;
}

.resource-card__visual--placeholder::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  width: 220%;
  height: 220%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(0, 245, 160, 0.16), transparent 60%);
}

.resource-card__visual-initial {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  color: rgba(var(--ghost-rgb), 0.35);
}

.resource-card__visual-chip {
  position: absolute;
  z-index: 1;
  bottom: var(--space-sm);
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px dashed var(--border-subtle);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  white-space: nowrap;
  background: rgba(6, 15, 34, 0.5);
}

.resource-card__body {
  padding: var(--space-md) var(--space-lg) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  flex: 1;
}

.resource-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.resource-card__type {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--border-accent);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
}

.resource-card__date {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.resource-card__icon {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--accent);
  flex-shrink: 0;
}

.resource-card__icon svg {
  width: 18px;
  height: 18px;
}

.resource-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: var(--leading-snug);
}

.resource-card__topic {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.resource-card__summary {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: var(--leading-normal);
}

.resource-card__footer {
  margin-top: auto;
  padding-top: var(--space-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-subtle);
}

.resource-card__cta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  background: none;
  border: none;
  cursor: pointer;
}

.resource-card__cta:hover .arrow {
  transform: translateX(4px);
}

.resource-card__gated {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

@media (max-width: 700px) {
  .resource-featured {
    padding: var(--space-xl) var(--space-md);
  }

  .resource-featured__grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}