/* ==========================================================================
   BGG Data Analysis landing page (/bgg/)
   --------------------------------------------------------------------------
   Bootstrap-free, design tokens only (docs/adr/0002) — pattern of
   homepage.css. Loaded only by home_bgg.html; the article pages use
   css/bgg-article.css (issue #3).
   ========================================================================== */

/* Bootstrap reboot (body { margin: 0 }) is not loaded here, so reset the
   browser-default body margin ourselves; otherwise the white html background
   shows as an 8px frame around the page. */
body {
  margin: 0;
}

.bgg-home {
  box-sizing: border-box;
  font-family: var(--font-sans);
  font-size: var(--text-base);
}

/* Without Bootstrap's reboot there is no global border-box; keep the
   homepage.css pattern so height:100% + padding cannot overflow. */
.bgg-home *,
.bgg-home *::before,
.bgg-home *::after {
  box-sizing: inherit;
}

.bgg-container {
  margin-inline: auto;
  max-width: var(--container-max);
  padding-inline: var(--container-gutter);
}

/* --- Hero ----------------------------------------------------------------- */

.bgg-hero {
  align-items: center;
  background-image:
    linear-gradient(rgba(15, 18, 26, 0.55), rgba(15, 18, 26, 0.8)),
    url("../images/background_notes.cee9d6d043f5.jpg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  color: var(--color-text-inverse);
  display: flex;
  padding: var(--space-8) var(--container-gutter);
  text-align: center;
}

.bgg-hero-inner {
  margin-inline: auto;
  max-width: 52rem;
}

.bgg-hero h1 {
  font-size: clamp(var(--text-2xl), 4vw, var(--text-3xl));
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  margin: 0;
}

/* --- Highlight tiles -------------------------------------------------------- */

.bgg-section {
  padding-block: var(--space-8);
}

.bgg-highlights {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .bgg-highlights {
    grid-template-columns: repeat(3, 1fr);
  }
}

.bgg-tile {
  aspect-ratio: 3 / 4;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  color: var(--color-text-inverse);
  display: block;
  overflow: hidden;
  position: relative;
  text-decoration: none;
}

.bgg-tile:hover,
.bgg-tile:focus-visible {
  box-shadow: var(--shadow-md);
}

.bgg-tile:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.bgg-tile-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  justify-content: flex-end;
  padding: var(--space-4);
}

.bgg-tile-header {
  background-color: color-mix(in srgb, var(--color-header) 72%, transparent);
  border-radius: var(--radius);
  display: block;
  padding: var(--space-2) var(--space-3);
  text-align: center;
}

.bgg-tile-title {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
  margin: 0;
}

/* --- Two-column layout ------------------------------------------------------ */

.bgg-layout {
  display: grid;
  gap: var(--space-6);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .bgg-layout {
    grid-template-columns: minmax(0, 1fr) 18rem;
  }
}

.bgg-articles {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  align-content: start;
}

/* --- Article cards ------------------------------------------------------------ */

.bgg-card {
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition:
    box-shadow var(--transition-base),
    transform var(--transition-base);
}

.bgg-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* The JS filter hides non-matching cards; an explicit rule keeps [hidden]
   working even though .bgg-card sets display itself. */
.bgg-card[hidden] {
  display: none;
}

.bgg-card a {
  color: inherit;
  text-decoration: none;
}

/* styles.css tints links inside <article> teal for article pages; the
   landing page cards use the design-token link color instead. */
.bgg-card a:hover {
  color: var(--color-brand);
}

.bgg-card a:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.bgg-card-img-link {
  display: block;
}

.bgg-card-img {
  display: block;
  height: 12rem;
  object-fit: cover;
  width: 100%;
}

.bgg-card-body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-5);
}

.bgg-card-title {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  line-height: var(--leading-snug);
  margin: 0;
}

.bgg-card-text {
  color: var(--color-text-soft);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  margin: 0;
}

.bgg-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-block-start: var(--space-2);
}

/* Coming-soon teasers (ADR 0005): greyed out, not interactive. */
.bgg-card.is-coming-soon {
  cursor: default;
  opacity: 0.6;
}

.bgg-card.is-coming-soon:hover {
  box-shadow: var(--shadow-sm);
  transform: none;
}

.bgg-card-date {
  color: var(--color-text-soft);
  font-size: var(--text-sm);
  margin: 0;
}

/* --- Tag chips (card labels and filter buttons share one look) -------------- */

.bgg-chip {
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  padding: 0.25rem 0.75rem;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast);
}

.bgg-chip:hover {
  border-color: var(--color-brand);
  color: var(--color-brand);
}

.bgg-chip.is-active {
  background-color: var(--color-brand);
  border-color: var(--color-brand);
  color: var(--color-text-inverse);
}

.bgg-chip:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* --- Sidebar ------------------------------------------------------------------ */

.bgg-sidebar {
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

@media (min-width: 768px) {
  .bgg-sidebar {
    position: sticky;
    top: 4.5rem; /* clears the sticky navbar */
  }
}

.bgg-panel {
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  padding: var(--space-5);
}

.bgg-panel-title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  margin: 0 0 var(--space-3);
}

.bgg-panel-text {
  color: var(--color-text-soft);
  line-height: var(--leading-normal);
  margin: 0;
}

.bgg-filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}