/* resources.css: Resources page (BIM connector video library).
   Loaded before theme.css, which supplies the colour tokens, navigation and footer. */

/* ---------- Layout ---------- */
.section-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-title {
  text-align: center;
  margin-bottom: 1.25rem;
}

/* Language switch base (theme.css adds the brand colours) */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 1px;
  overflow: hidden;
}
.lang-btn {
  background: transparent;
  border: none;
  padding: 0.17rem 0.3rem;
  font-size: 0.62rem;
  font-weight: 700;
  cursor: pointer;
}

/* ---------- Page header ---------- */
.res-hero {
  padding: 4.5rem 0 3rem;
  text-align: center;
}
.res-eyebrow {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}
.res-lead {
  max-width: 46rem;
  margin: 0 auto;
  color: var(--text-soft);
  font-size: 1.1rem;
  line-height: 1.65;
}
.res-explainer {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  max-width: 60rem;
  margin: 2.75rem auto 0;
  text-align: left;
}
.res-explainer-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left-width: 3px;
  border-radius: 10px;
  padding: 1.4rem 1.6rem 1.5rem;
}
/* Edge colours match the card tags below */
.res-explainer-card--ai { border-left-color: var(--accent); }
.res-explainer-card--interop { border-left-color: var(--text-soft); }
.res-explainer-card h2 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.45rem;
}
.res-explainer-card p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ---------- Toolbar: jump links and type filter ---------- */
.res-toolbar {
  position: sticky;
  top: var(--nav-height);
  z-index: 50;
  background: var(--nav-bg);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.res-toolbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}
.res-jump {
  display: flex;
  gap: 0.5rem;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}
.res-jump::-webkit-scrollbar { display: none; }

.res-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.42rem 0.85rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  color: var(--text-soft);
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}
.res-chip:hover { border-color: var(--accent); color: var(--text); }
.res-chip[aria-current="true"] {
  border-color: var(--accent);
  background: rgba(var(--accent-rgb), 0.1);
  color: var(--accent);
}
.res-chip[hidden] { display: none; }
.res-chip-count {
  color: var(--faint);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
}

.res-filter {
  display: inline-flex;
  flex-shrink: 0;
  padding: 3px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
}
.res-filter[hidden] { display: none; }
.res-filter-btn {
  padding: 0.38rem 0.8rem;
  border-radius: 5px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.2s ease, background-color 0.2s ease;
}
.res-filter-btn:hover { color: var(--text); }
.res-filter-btn[aria-pressed="true"] {
  background: var(--accent);
  color: var(--on-accent);
}

.res-chip:focus-visible,
.res-filter-btn:focus-visible,
.btn-primary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Connector groups ---------- */
.res-library { padding-bottom: 1rem; }

.res-group {
  padding-top: 3.5rem;
  scroll-margin-top: calc(var(--nav-height) + 4rem);
}
.res-group[hidden] { display: none; }

.res-group-head {
  display: grid;
  grid-template-columns: minmax(0, 20rem) minmax(0, 1fr);
  gap: 0.5rem 2.5rem;
  align-items: baseline;
  padding-bottom: 1.4rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--line);
}
.res-group-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text);
}
.res-count {
  padding: 0.1rem 0.6rem;
  border: 1px solid rgba(var(--accent-rgb), 0.45);
  border-radius: 999px;
  color: var(--accent);
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.res-group-intro {
  max-width: 44rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- Video cards ---------- */
.res-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.res-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.res-card:hover {
  border-color: rgba(var(--accent-rgb), 0.55);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
  transform: translateY(-3px);
}
.res-card[hidden] { display: none; }

.res-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--surface-2);
  overflow: hidden;
}
.res-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.res-card:hover .res-thumb img { transform: scale(1.03); }

.res-play {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 52px;
  height: 52px;
  margin: -26px 0 0 -26px;
  border-radius: 50%;
  background: rgba(16, 19, 22, 0.82);
  display: grid;
  place-items: center;
  transition: background-color 0.2s ease;
}
.res-play::before {
  content: "";
  margin-left: 4px;
  border-style: solid;
  border-width: 9px 0 9px 15px;
  border-color: transparent transparent transparent var(--text);
}
.res-card:hover .res-play { background: var(--accent); }
.res-card:hover .res-play::before { border-left-color: var(--on-accent); }

.res-card-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 1.15rem 1.25rem 1.2rem;
}

.res-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}
.res-tag {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.res-tag--ai {
  color: var(--accent);
  background: rgba(var(--accent-rgb), 0.12);
  border: 1px solid rgba(var(--accent-rgb), 0.4);
}
.res-tag--interop {
  color: var(--text-soft);
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
}

.res-card-title {
  font-size: 1.12rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
  margin-bottom: 0.55rem;
}
.res-card-title a { color: inherit; }
/* Stretched link: the whole card is one click target and one tab stop */
.res-card-title a::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: 10px;
}
.res-card-title a:focus-visible { outline: none; }
.res-card-title a:focus-visible::after {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.res-card-desc {
  flex: 1;
  color: var(--text-soft);
  font-size: 0.94rem;
  line-height: 1.6;
}

.res-card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.1rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
}
.res-card-channel {
  min-width: 0;
  overflow: hidden;
  color: var(--muted);
  text-overflow: ellipsis;
  white-space: nowrap;
}
.res-card-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
  color: var(--accent);
  font-weight: 600;
  white-space: nowrap;
}
.res-card-cta svg { width: 14px; height: 14px; }

/* Compact variant for the general library */
.res-grid--compact { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 1.25rem; }
.res-card--compact .res-card-body { padding: 0.95rem 1.05rem 1rem; }
.res-card--compact .res-card-title { font-size: 1rem; margin-bottom: 0.4rem; flex: 1; }
.res-card--compact .res-card-channel { font-size: 0.85rem; }
.res-card--compact .res-play { width: 44px; height: 44px; margin: -22px 0 0 -22px; }

/* ---------- Call to action ---------- */
.res-cta { padding: 4rem 0 1rem; }
.res-cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding: 2.25rem 2.5rem;
  background: var(--surface);
  border: 1px solid rgba(var(--accent-rgb), 0.45);
  border-radius: 12px;
}
.res-cta h2 {
  font-size: 1.6rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--text);
  margin-bottom: 0.45rem;
}
.res-cta p { color: var(--text-soft); line-height: 1.6; max-width: 40rem; }
.btn-primary {
  display: inline-block;
  flex-shrink: 0;
  padding: 0.9rem 1.6rem;
  white-space: nowrap;
  transition: background-color 0.2s ease;
}

/* ---------- More resources ---------- */
.res-more {
  padding-top: 4.5rem;
  padding-bottom: 5rem;
  scroll-margin-top: calc(var(--nav-height) + 4rem);
}
.res-more-sub {
  margin-bottom: 1rem;
  color: var(--muted);
  font-size: 1.05rem;
  text-align: center;
}
.res-subhead {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 2.75rem 0 1.5rem;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.res-subhead::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.res-articles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}
.res-article .res-card-body { padding: 1.25rem 1.35rem; }
.res-article-source {
  margin-bottom: 0.6rem;
  color: var(--faint);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.res-article .res-card-meta { justify-content: flex-end; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .res-group-head { grid-template-columns: 1fr; }
  .res-cta-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 768px) {
  .section-content { padding: 0 1.25rem; }
  .res-hero { padding: 3rem 0 2.25rem; }
  .res-lead { font-size: 1rem; }
  .res-explainer { grid-template-columns: 1fr; margin-top: 2rem; }

  .res-toolbar-inner {
    flex-direction: column;
    align-items: stretch;
    gap: 0.6rem;
    padding-top: 0.6rem;
    padding-bottom: 0.6rem;
  }
  .res-jump {
    margin: 0 -1.25rem;
    padding: 0 1.25rem;
  }
  .res-filter { display: flex; }
  .res-filter-btn { flex: 1; padding: 0.45rem 0.5rem; }

  .res-group { padding-top: 2.5rem; scroll-margin-top: calc(var(--nav-height) + 7rem); }
  .res-group-title { font-size: 1.5rem; }
  .res-grid { grid-template-columns: 1fr; }
  .res-grid--compact { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
  .res-articles { grid-template-columns: 1fr; }
  .res-cta-inner { padding: 1.75rem 1.5rem; }
  .res-more { scroll-margin-top: calc(var(--nav-height) + 7rem); }
}

@media (prefers-reduced-motion: reduce) {
  .res-card,
  .res-thumb img { transition: none; }
  .res-card:hover { transform: none; }
  .res-card:hover .res-thumb img { transform: none; }
}