/* ── Controls bar ── */
.kb-controls {
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  position: sticky;
  top: 72px;
  z-index: 50;
}
.kb-controls__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

/* Filters */
.kb-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.kb-filter {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}
.kb-filter:hover { border-color: var(--blue-light); color: var(--blue-light); }
.kb-filter--active {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

/* Search */
.kb-search-wrap {
  position: relative;
  flex-shrink: 0;
}
.kb-search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  pointer-events: none;
}
.kb-search {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px 10px 40px;
  border-radius: 50px;
  font-size: 0.875rem;
  font-family: inherit;
  width: 240px;
  transition: border-color 0.2s;
  outline: none;
}
.kb-search::placeholder { color: var(--text-muted); }
.kb-search:focus { border-color: var(--blue-light); }

/* ── Grid ── */
.kb-section { background: var(--bg); }
.kb-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

/* ── Card ── */
.kb-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.kb-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0,90,255,0.3);
  box-shadow: 0 16px 48px rgba(0,90,255,0.12);
}

/* Image header */
.kb-card__image {
  position: relative;
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.kb-card__image--blue   { background: linear-gradient(135deg, rgba(0,90,255,0.18) 0%, rgba(0,90,255,0.06) 100%); }
.kb-card__image--orange { background: linear-gradient(135deg, rgba(255,165,0,0.18) 0%, rgba(255,165,0,0.06) 100%); }
.kb-card__image--green  { background: linear-gradient(135deg, rgba(34,197,94,0.18) 0%, rgba(34,197,94,0.06) 100%); }
.kb-card__image--purple { background: linear-gradient(135deg, rgba(168,85,247,0.18) 0%, rgba(168,85,247,0.06) 100%); }

.kb-card__image-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 32px 32px;
}
.kb-card__image > svg {
  position: relative;
  z-index: 1;
  width: 56px;
  height: 56px;
  opacity: 0.9;
}
.kb-card__image--blue   > svg { color: var(--blue-light); }
.kb-card__image--orange > svg { color: var(--orange); }
.kb-card__image--green  > svg { color: #4ade80; }
.kb-card__image--purple > svg { color: #c084fc; }

/* Card body */
.kb-card__body {
  padding: 24px 28px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1;
}

.kb-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.kb-read-time {
  font-size: 0.76rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* Badges */
.kb-badge {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 50px;
  letter-spacing: 0.3px;
}
.kb-badge--blue {
  background: rgba(0,90,255,0.1);
  border: 1px solid rgba(0,90,255,0.25);
  color: var(--blue-light);
}
.kb-badge--orange {
  background: rgba(255,165,0,0.1);
  border: 1px solid rgba(255,165,0,0.25);
  color: var(--orange);
}
.kb-badge--green {
  background: rgba(34,197,94,0.1);
  border: 1px solid rgba(34,197,94,0.25);
  color: #4ade80;
}
.kb-badge--purple {
  background: rgba(168,85,247,0.1);
  border: 1px solid rgba(168,85,247,0.25);
  color: #c084fc;
}

.kb-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.3px;
}
.kb-card__excerpt {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.7;
  flex: 1;
}

.kb-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}
.kb-author {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}
.kb-author__avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--blue);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.kb-card__link {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--blue-light);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  transition: gap 0.2s;
  white-space: nowrap;
}
.kb-card__link svg { width: 14px; height: 14px; }
.kb-card__link:hover { gap: 10px; }

/* ── Empty state ── */
.kb-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 80px 0;
  color: var(--text-muted);
  text-align: center;
}
.kb-empty svg { width: 48px; height: 48px; opacity: 0.3; }
.kb-empty p { font-size: 1rem; }

/* ── CTA ── */
.kb-cta { background: var(--bg-2); }
.kb-cta__inner {
  background: linear-gradient(135deg, #0d1628 0%, #0d1a38 100%);
  border: 1px solid rgba(0,90,255,0.25);
  border-radius: var(--radius);
  padding: 64px 56px;
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
}
.kb-cta__inner .section__label { display: block; margin-bottom: 12px; }
.kb-cta__inner h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.8px;
  margin-bottom: 16px;
}
.kb-cta__inner p {
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 32px;
  font-size: 1rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .kb-controls__inner { flex-direction: column; align-items: stretch; }
  .kb-filters         { justify-content: center; }
  .kb-search { width: 100%; }
  .kb-cta__inner { padding: 40px 28px; }
}
@media (max-width: 480px) {
  .kb-grid { grid-template-columns: 1fr; }
  .kb-card__body { padding: 20px 20px 24px; }
  .kb-card__image { height: 120px; }
}