/* ═══════════════════════════════════════════════════════════════
   База знаний — /baza-znanii/
   ═══════════════════════════════════════════════════════════════ */

:root {
  --navy:     #1B3A6B;
  --orange:   #E65100;
  --blue:     #38A3E8;
  --blue-dk:  #1E72CC;
  --green:    #16A34A;
  --gray:     #4A5568;
  --bg:       #F4F7FB;
  --border:   #E8EDF3;
  --fh:       'Montserrat', sans-serif;
  --fb:       'Inter', sans-serif;
  --r:        12px;
  --rs:       8px;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  font-family: var(--fb);
  background: var(--bg);
  color: #2D3748;
  margin: 0;
  -webkit-font-smoothing: antialiased;
}

/* ── Breadcrumb ─────────────────────────────────────────────── */
.bz-breadcrumb {
  max-width: 1280px; margin: 0 auto;
  padding: 14px 24px 0;
  font-size: 12.5px; color: #8A94A6;
  display: flex; align-items: center; gap: 6px;
}
.bz-breadcrumb a { color: #8A94A6; text-decoration: none; transition: color .15s; }
.bz-breadcrumb a:hover { color: var(--navy); }
.bz-breadcrumb span { color: #CBD5E0; }

/* ── Hero ───────────────────────────────────────────────────── */
.bz-hero {
  max-width: 1280px; margin: 0 auto;
  padding: 40px 24px 32px;
  display: flex; align-items: flex-end; justify-content: space-between; gap: 32px;
  position: relative;
}

.bz-hero-left { flex: 1; }

.bz-hero-tag {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(30,114,204,.1);
  color: var(--blue-dk);
  font-family: var(--fh); font-size: 11px; font-weight: 700;
  letter-spacing: .06em; text-transform: uppercase;
  padding: 5px 12px; border-radius: 20px;
  margin-bottom: 16px;
}
.bz-hero-tag svg { flex-shrink: 0; }

.bz-hero h1 {
  font-family: var(--fh);
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 900;
  color: var(--navy);
  letter-spacing: -.5px;
  line-height: 1.1;
  margin: 0 0 16px;
}
.bz-hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--blue-dk) 0%, var(--blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.bz-hero-sub {
  font-size: 15px; color: #6B7280; line-height: 1.65;
  max-width: 540px; margin: 0;
}

.bz-hero-stats {
  display: flex; gap: 32px; margin-top: 32px;
}
.bz-hs { text-align: left; }
.bz-hs-num {
  font-family: var(--fh); font-size: 28px; font-weight: 900; color: var(--navy);
  line-height: 1;
}
.bz-hs-num em { font-style: normal; color: var(--orange); font-size: 18px; }
.bz-hs-txt { font-size: 12px; color: #8A94A6; margin-top: 4px; line-height: 1.4; }

/* Декоративная схема справа */
.bz-hero-visual {
  flex-shrink: 0; width: 280px; height: 180px;
  position: relative; display: flex; align-items: center; justify-content: center;
}
.bz-hero-visual svg { width: 100%; height: 100%; }

/* ── Фильтры ────────────────────────────────────────────────── */
.bz-filters-wrap {
  background: #fff;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 60px; z-index: 100;
}

.bz-filters {
  max-width: 1280px; margin: 0 auto;
  padding: 0 24px;
}

/* Категорийные вкладки */
.bz-cat-tabs {
  display: flex; gap: 0;
  overflow-x: auto; scrollbar-width: none;
}
.bz-cat-tabs::-webkit-scrollbar { display: none; }

.bz-cat-btn {
  font-family: var(--fh); font-size: 13px; font-weight: 600;
  color: #6B7280; background: none; border: none;
  padding: 14px 20px; cursor: pointer;
  position: relative; white-space: nowrap;
  transition: color .2s;
}
.bz-cat-btn::after {
  content: ''; position: absolute; bottom: 0; left: 20px; right: 20px;
  height: 2px; background: var(--blue-dk);
  transform: scaleX(0); transition: transform .2s;
}
.bz-cat-btn:hover { color: var(--navy); }
.bz-cat-btn.active { color: var(--navy); }
.bz-cat-btn.active::after { transform: scaleX(1); }

.bz-cat-dot {
  display: inline-block; width: 7px; height: 7px;
  border-radius: 50%; margin-right: 6px; vertical-align: middle;
}

/* Хэштег-облако */
.bz-tag-cloud {
  display: flex; flex-wrap: wrap; gap: 6px;
  padding: 10px 0 14px;
  border-top: 1px solid #F0F4FA;
}

.bz-tag {
  font-family: var(--fb); font-size: 12px; font-weight: 500;
  color: #6B7280; background: #F4F7FB;
  border: 1px solid var(--border);
  padding: 4px 10px; border-radius: 20px;
  cursor: pointer; transition: all .15s;
  white-space: nowrap;
}
.bz-tag:hover { color: var(--blue-dk); border-color: var(--blue); background: rgba(56,163,232,.07); }
.bz-tag.active { color: var(--blue-dk); border-color: var(--blue-dk); background: rgba(30,114,204,.1); font-weight: 700; }

/* ── Контент ────────────────────────────────────────────────── */
.bz-content {
  max-width: 1280px; margin: 0 auto;
  padding: 36px 24px 64px;
}

/* Строка счётчик+сортировка */
.bz-content-bar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 24px;
}
.bz-count {
  font-size: 13px; color: #8A94A6;
}
.bz-count strong { color: var(--navy); font-weight: 700; }

/* Сброс фильтров */
.bz-reset {
  font-size: 12px; color: #8A94A6; background: none; border: none;
  cursor: pointer; text-decoration: underline; display: none;
  transition: color .15s;
}
.bz-reset:hover { color: var(--navy); }
.bz-reset.visible { display: inline; }

/* ── Сетка карточек ─────────────────────────────────────────── */
.bz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* ── Карточка ───────────────────────────────────────────────── */
.bz-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--r);
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: transform .2s, box-shadow .2s, border-color .2s;
  text-decoration: none; color: inherit;
  position: relative;
}
.bz-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,.09);
  border-color: #D1DCF0;
}

/* Цветная полоска сверху */
.bz-card-stripe {
  height: 3px; width: 100%;
  flex-shrink: 0;
}
.bz-card[data-cat="ventilation"] .bz-card-stripe { background: linear-gradient(90deg, var(--blue-dk), var(--blue)); }
.bz-card[data-cat="heating"]    .bz-card-stripe { background: linear-gradient(90deg, #C2410C, var(--orange)); }
.bz-card[data-cat="dust"]       .bz-card-stripe { background: linear-gradient(90deg, #15803D, var(--green)); }

.bz-card-body { padding: 20px 20px 0; flex: 1; }

/* Бейдж категории */
.bz-card-badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-family: var(--fh); font-size: 10.5px; font-weight: 700;
  letter-spacing: .05em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 20px;
  margin-bottom: 12px;
}
.badge-ventilation { color: var(--blue-dk); background: rgba(30,114,204,.1); }
.badge-heating     { color: #C2410C;         background: rgba(230,81,0,.1); }
.badge-dust        { color: #15803D;          background: rgba(22,163,74,.1); }

.bz-card-title {
  font-family: var(--fh); font-size: 15.5px; font-weight: 800;
  color: var(--navy); line-height: 1.35;
  margin: 0 0 10px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.bz-card:hover .bz-card-title { color: var(--blue-dk); }

.bz-card-lead {
  font-size: 13.5px; color: #6B7280; line-height: 1.65;
  margin: 0 0 14px;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Хэштеги на карточке */
.bz-card-tags {
  display: flex; flex-wrap: wrap; gap: 5px;
  margin-bottom: 16px;
}
.bz-card-tag {
  font-size: 11.5px; color: #8A94A6;
  background: #F4F7FB; border: 1px solid var(--border);
  padding: 2px 8px; border-radius: 12px;
  cursor: pointer; transition: all .12s;
}
.bz-card-tag:hover { color: var(--blue-dk); border-color: var(--blue); }

/* Футер карточки */
.bz-card-foot {
  padding: 14px 20px 18px;
  display: flex; align-items: center; justify-content: space-between;
  border-top: 1px solid #F4F7FB;
  margin-top: auto;
}
.bz-card-meta { font-size: 12px; color: #A0AEC0; display: flex; align-items: center; gap: 10px; }
.bz-card-meta svg { color: #C8D0DC; }

.bz-read-link {
  font-family: var(--fh); font-size: 12.5px; font-weight: 700;
  color: var(--blue-dk); text-decoration: none;
  display: inline-flex; align-items: center; gap: 4px;
  transition: gap .15s, color .15s;
}
.bz-card:hover .bz-read-link { gap: 8px; }

/* ── Пустое состояние ───────────────────────────────────────── */
.bz-empty {
  grid-column: 1 / -1;
  padding: 64px 24px; text-align: center;
  display: none;
}
.bz-empty-icon { font-size: 40px; margin-bottom: 12px; }
.bz-empty h3 { font-family: var(--fh); font-size: 18px; color: var(--navy); margin: 0 0 8px; }
.bz-empty p  { font-size: 14px; color: #8A94A6; }

.bz-empty.show { display: block; }

/* Анимация появления карточек */
.bz-card { animation: cardIn .25s ease both; }
@keyframes cardIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.bz-card.hidden { display: none; }

/* ── CTA секция ─────────────────────────────────────────────── */
.bz-cta {
  background: var(--navy);
  position: relative; overflow: hidden;
}
.bz-cta::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 80% 50%, rgba(56,163,232,.15) 0%, transparent 60%);
  pointer-events: none;
}
.bz-cta-in {
  max-width: 1280px; margin: 0 auto;
  padding: 48px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 32px;
  position: relative;
}
.bz-cta-txt h2 {
  font-family: var(--fh); font-size: 22px; font-weight: 800;
  color: #fff; margin: 0 0 8px;
}
.bz-cta-txt p { font-size: 14px; color: rgba(255,255,255,.65); margin: 0; line-height: 1.6; }
.bz-cta-btn {
  background: #fff; color: var(--navy);
  font-family: var(--fh); font-size: 13.5px; font-weight: 800;
  padding: 13px 28px; border-radius: var(--rs); border: none;
  cursor: pointer; white-space: nowrap;
  transition: transform .15s, box-shadow .15s;
  text-decoration: none; display: inline-block;
}
.bz-cta-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,.2); }

/* ── Адаптив ────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .bz-grid { grid-template-columns: repeat(2, 1fr); }
  .bz-hero-visual { display: none; }
}

@media (max-width: 768px) {
  .bz-hero { flex-direction: column; padding: 28px 16px 24px; gap: 24px; }
  .bz-hero-stats { gap: 20px; }
  .bz-hs-num { font-size: 22px; }
  .bz-filters { padding: 0 16px; }
  .bz-content { padding: 24px 16px 48px; }
  .bz-grid { grid-template-columns: 1fr; gap: 14px; }
  .bz-cat-btn { padding: 12px 14px; font-size: 12.5px; }
  .bz-breadcrumb { padding: 10px 16px 0; }
  .bz-cta-in { flex-direction: column; text-align: center; }
}