/* ============================================================
   Knowledge base
   ============================================================ */

/* ── Hero ─────────────────────────────────────────────────── */
.kb-hero {
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  padding: 44px 48px 40px;
  background: linear-gradient(135deg, #071a14 0%, #0d1f1a 50%, #051520 100%);
  color: #fff;
  margin-bottom: 24px;
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.kb-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(52, 211, 153, .22), transparent 50%),
    radial-gradient(circle at 15% 80%, rgba(6, 182, 212, .18), transparent 50%);
  pointer-events: none;
}

.kb-hero__content { position: relative; flex: 1; min-width: 0; }

.kb-hero__badge {
  display: inline-flex;
  align-items: center;
  padding: 5px 14px;
  border-radius: 100px;
  background: rgba(52, 211, 153, .15);
  border: 1px solid rgba(52, 211, 153, .3);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .9);
  margin-bottom: 16px;
}

.kb-hero__title {
  font-size: clamp(2.2rem, 4vw + 1rem, 3.5rem);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.08;
  margin: 0 0 14px;
}

.kb-hero__gradient {
  background: linear-gradient(90deg, #34d399, #06b6d4);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.kb-hero__sub {
  font-size: .9rem;
  line-height: 1.65;
  color: rgba(255, 255, 255, .68);
  margin: 0;
  max-width: 520px;
}

/* ── Search bar ────────────────────────────────────────────── */
.kb-search-wrap {
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.kb-search {
  position: relative;
  display: flex;
  align-items: center;
}

.kb-search__icon {
  position: absolute;
  left: 16px;
  width: 18px;
  height: 18px;
  color: var(--ink-mute);
  pointer-events: none;
  flex-shrink: 0;
}

.kb-search__input {
  width: 100%;
  padding: 14px 44px 14px 48px;
  border-radius: 14px;
  border: 1px solid var(--glass-border);
  background: var(--card-bg);
  color: var(--ink);
  font-size: .95rem;
  outline: none;
  transition: border-color .2s ease, box-shadow .2s ease;
}

.kb-search__input::placeholder { color: var(--ink-mute); }

.kb-search__input:focus {
  border-color: rgba(52, 211, 153, .5);
  box-shadow: 0 0 0 3px rgba(52, 211, 153, .1);
}

.kb-search__clear {
  position: absolute;
  right: 14px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: none;
  background: var(--glass-bg-strong);
  color: var(--ink-soft);
  font-size: .8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s ease;
}

.kb-search__clear.visible {
  opacity: 1;
  pointer-events: auto;
}

/* ── Category pills ────────────────────────────────────────── */
.kb-cats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.kb-cat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 100px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--ink-soft);
  font-size: .8rem;
  font-weight: 500;
  cursor: pointer;
  transition: background .18s ease, border-color .18s ease, color .18s ease;
  white-space: nowrap;
}

.kb-cat:hover {
  background: var(--glass-bg-strong);
  color: var(--ink);
}

.kb-cat.active {
  background: rgba(52, 211, 153, .14);
  border-color: rgba(52, 211, 153, .6);
}

.kb-pill-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 18px;
  padding: 0 5px;
  border-radius: 100px;
  background: rgba(0, 0, 0, .08);
  font-size: .7rem;
  font-weight: 600;
}

[data-theme="dark"] .kb-pill-count {
  background: rgba(255, 255, 255, .1);
}

/* ── Knowledge grid ────────────────────────────────────────── */
.knowledge {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.knowledge__container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 20px 16px 16px;
  transition: opacity .2s ease;
}

.knowledge__container.kb-hidden { display: none; }

.knowledge__group-title {
  color: var(--ink);
  font-size: 1.05rem;
  font-weight: 700;
  padding: 0 0 14px 0;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.knowledge__group-title .kb-icon {
  font-size: 1.15em;
  line-height: 1;
}

/* Term count badge in title */
.kb-count {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 22px;
  padding: 0 7px;
  border-radius: 100px;
  background: rgba(52, 211, 153, .12);
  border: 1px solid rgba(52, 211, 153, .25);
  color: #34d399;
  font-size: .72rem;
  font-weight: 700;
}

.knowledge__block {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 10px 14px;
  border-radius: 8px;
}

.knowledge__block.kb-hidden { display: none; }

.knowledge__block h3 {
  color: var(--ink);
  font-size: .9rem;
  margin-bottom: 3px;
}

.knowledge__block p {
  color: var(--ink-soft);
  font-size: .85rem;
  line-height: 1.5;
}

/* ── No results ────────────────────────────────────────────── */
#kbNoResults {
  display: none;
  text-align: center;
  padding: 48px 24px;
  color: var(--ink-mute);
  font-size: .95rem;
}

#kbNoResults.visible { display: block; }

#kbNoResults strong {
  display: block;
  font-size: 2rem;
  margin-bottom: 8px;
}

/* ── Back to top ───────────────────────────────────────────── */
#kbBackTop {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--card-bg);
  box-shadow: 0 4px 16px rgba(0,0,0,.12);
  color: var(--ink);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity .25s ease, transform .25s ease;
  z-index: 80;
}

#kbBackTop.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

#kbBackTop:hover {
  background: rgba(52, 211, 153, .12);
  border-color: rgba(52, 211, 153, .4);
  color: #34d399;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 640px) {
  .kb-hero {
    flex-direction: column;
    padding: 28px 24px;
    gap: 20px;
  }
.kb-hero__title { font-size: 2rem; }
  .kb-cats { gap: 6px; }
  .kb-cat { font-size: .75rem; padding: 5px 10px; }
  #kbBackTop { bottom: 16px; right: 16px; }
}