/* =============================================================
   Курс «Системы обнаружения вторжений»
   /catalog.css — стили страниц-каталогов и разделов.

   Используется на:
     /demos/index.html
     /labs/index.html
     /labs/alt/index.html
     /tests/index.html
     /basics/index.html
   ============================================================= */

/* ============ Сетка каталога ============ */
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
  margin-top: 1.2rem;
}

/* ============ Карточка каталога ============ */
.catalog-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 1.2rem 1.3rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  transition: transform var(--t), border-color var(--t), box-shadow var(--t);
  overflow: hidden;
}
.catalog-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(400px 200px at 100% 0%,
              rgba(52, 211, 153, .08), transparent 60%);
  opacity: 0;
  transition: opacity var(--t);
  pointer-events: none;
}
.catalog-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: inherit;
}
.catalog-card:hover::before { opacity: 1; }

.catalog-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .6rem;
  margin-bottom: .75rem;
}
.catalog-card__icon {
  display: grid;
  place-items: center;
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
  flex: none;
}
.catalog-card__icon svg { width: 22px; height: 22px; }
.catalog-card__badges {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem;
  justify-content: flex-end;
}
.catalog-card__badges .badge { font-size: .66rem; padding: .16rem .5rem; }

.catalog-card h3 {
  font-size: 1.02rem;
  margin: 0 0 .4rem;
  line-height: 1.3;
  color: var(--text);
}
.catalog-card > p {
  font-size: .9rem;
  color: var(--text-muted);
  margin: 0 0 .9rem;
  line-height: 1.55;
  flex: 1;
}

.catalog-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem;
  margin-bottom: .9rem;
}
.catalog-card__tags .chip {
  padding: .16rem .5rem;
  font-size: .7rem;
  pointer-events: none;
}

.catalog-card .card-foot {
  margin-top: auto;
  padding-top: .75rem;
  border-top: 1px solid var(--border-dim);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  font-size: .82rem;
  color: var(--text-dim);
}
.catalog-card .card-foot .card-arrow {
  color: var(--accent);
  font-size: 1.1rem;
  transition: transform var(--t);
  line-height: 1;
}
.catalog-card:hover .card-foot .card-arrow { transform: translateX(4px); }

.catalog-progress {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  margin-top: .7rem;
  font-size: .78rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}
.catalog-progress input[type="checkbox"] { width: 15px; height: 15px; }
.catalog-progress:hover { color: var(--accent); }

/* ============ Фильтры ============ */
.catalog-filters {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
  align-items: center;
  margin: 1.4rem 0 0;
  padding: .9rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius);
}
.catalog-filters input[type="search"] {
  flex: 1 1 220px;
  min-width: 0;
}
.catalog-filters__chips {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
}
.catalog-filter-chip {
  padding: .35rem .85rem;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  color: var(--text-muted);
  border: 1px solid var(--border-dim);
  font: inherit;
  font-size: .82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--t-fast);
  line-height: 1.4;
}
.catalog-filter-chip:hover {
  color: var(--text);
  border-color: var(--border-strong);
}
.catalog-filter-chip.is-active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}
.catalog-filters__count {
  margin-left: auto;
  font-size: .82rem;
  color: var(--text-dim);
  font-family: var(--mono);
  white-space: nowrap;
}

/* ============ Пустое состояние ============ */
.catalog-empty {
  padding: 2.4rem 1rem;
  text-align: center;
  color: var(--text-dim);
  font-size: .92rem;
  border: 1px dashed var(--border-dim);
  border-radius: var(--radius);
  margin-top: 1.2rem;
}

/* ============ Секция каталога ============ */
.catalog-section { margin-top: 2.2rem; }
.catalog-section > h2 {
  font-size: 1.2rem;
  margin-bottom: .2rem;
}
.catalog-section > p {
  color: var(--text-muted);
  margin: 0 0 .3rem;
  font-size: .92rem;
}

/* ============ Компактный список тестов ============ */
.test-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: .5rem;
  margin-top: .9rem;
}
.test-item {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .7rem .9rem;
  background: var(--surface);
  border: 1px solid var(--border-dim);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: inherit;
  transition: var(--t-fast);
}
.test-item:hover {
  border-color: var(--border-strong);
  background: var(--surface-2);
  text-decoration: none;
  color: inherit;
}
.test-item__icon {
  display: grid;
  place-items: center;
  width: 32px; height: 32px;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent);
  flex: none;
}
.test-item__icon svg { width: 16px; height: 16px; }
.test-item__body {
  flex: 1;
  min-width: 0;
}
.test-item__title {
  font-size: .9rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.3;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.test-item__meta {
  font-size: .74rem;
  color: var(--text-dim);
  font-family: var(--mono);
  margin-top: .1rem;
}
.test-item__count {
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--text-dim);
  flex: none;
}

/* ============ Вводная страница /basics/ ============ */
.intro-layout {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 2.4rem;
  align-items: start;
  margin-top: 1.4rem;
}
.intro-content {
  min-width: 0;
  font-size: 1.02rem;
  line-height: 1.7;
}
.intro-content > * + * { margin-top: 1em; }
.intro-content h2 {
  margin-top: 2.4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-dim);
}
.intro-content h2:first-child {
  margin-top: 0;
  border-top: none;
  padding-top: 0;
}
.intro-content h3 { margin-top: 1.8rem; }

.intro-toc {
  position: sticky;
  top: 84px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding: 1rem 0;
  font-size: .88rem;
}
.intro-toc__head {
  font-size: .72rem;
  letter-spacing: .10em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 0 0 .6rem;
  font-weight: 700;
}
.intro-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--border-dim);
}
.intro-toc__list a {
  display: block;
  padding: .35rem .8rem;
  color: var(--text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  margin-left: -2px;
  transition: var(--t-fast);
  line-height: 1.35;
}
.intro-toc__list a:hover {
  color: var(--text);
  border-left-color: var(--border-strong);
}
.intro-toc__list a.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
  background: var(--accent-soft);
}

@media (max-width: 900px) {
  .intro-layout { grid-template-columns: 1fr; gap: 1.4rem; }
  .intro-toc {
    position: static;
    max-height: none;
    border: 1px solid var(--border-dim);
    border-radius: var(--radius);
    padding: 1rem 1.1rem;
    background: var(--surface);
  }
}

/* ============ Responsive ============ */
@media (max-width: 560px) {
  .catalog-grid { grid-template-columns: 1fr; gap: .75rem; }
  .catalog-filters { padding: .75rem .8rem; }
  .catalog-filters__count { margin-left: 0; flex: 1 1 100%; }
}