/* ================================================================
   APGI — Engines page styles
   ================================================================ */

/* ── Hero ────────────────────────────────────────────────────── */

.engines-hero {
  padding: 160px 40px 80px;
  text-align: center;
}

.engines-hero-title {
  font-size: clamp(48px, 8vw, 96px);
  font-weight: 900;
  letter-spacing: -3px;
  line-height: 1;
  margin-bottom: 28px;
}

.engines-count {
  font-family: var(--mono);
  color: var(--text);
}

.engines-hero-sub {
  font-size: 18px;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

.engines-hero-sub br { display: block; }

/* ── Nav active state ────────────────────────────────────────── */

.nav-active {
  color: var(--text) !important;
}

/* ── Filter Bar ──────────────────────────────────────────────── */

.filter-bar {
  position: sticky;
  top: 52px;
  z-index: 90;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

.filter-scroll {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 0 4px;
}

.filter-scroll::-webkit-scrollbar {
  display: none;
}

.filter-btn {
  flex-shrink: 0;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-family: var(--font);
  font-size: 12px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 980px;
  cursor: pointer;
  transition: all 0.25s;
  white-space: nowrap;
}

.filter-btn:hover {
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text);
}

.filter-btn.active {
  background: var(--text);
  border-color: var(--text);
  color: var(--bg);
}

.filter-count {
  font-family: var(--mono);
  font-size: 11px;
  opacity: 0.6;
  margin-left: 4px;
}

.filter-btn.active .filter-count {
  opacity: 0.5;
}

/* ── Engine Sections ─────────────────────────────────────────── */

.engines-section {
  padding-top: 40px;
}

.engine-category {
  margin-bottom: 80px;
}

.engine-category.hidden {
  display: none;
}

.category-header {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.category-title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.category-count {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  font-family: var(--mono);
}

/* ── Engine Grid ─────────────────────────────────────────────── */

.engine-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.engine-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  transition: border-color 0.3s, transform 0.3s;
}

.engine-card:hover {
  border-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-2px);
}

.engine-crate {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.04);
  padding: 3px 8px;
  border-radius: 4px;
  margin-bottom: 12px;
  letter-spacing: 0.3px;
}

.engine-name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.2px;
  margin-bottom: 6px;
}

.engine-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ── Responsive ──────────────────────────────────────────────── */

@media (max-width: 900px) {
  .engine-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .engines-hero { padding: 140px 24px 60px; }
  .engines-hero-title { letter-spacing: -2px; }

  .filter-bar { padding: 12px 0; }
  .filter-scroll { padding: 0 24px; }

  .engines-section { padding: 24px 24px 80px; }
}

@media (max-width: 540px) {
  .engine-grid {
    grid-template-columns: 1fr;
  }

  .engine-card { padding: 20px; }
  .category-header { flex-direction: column; gap: 4px; }
}