/* skbpa:knowledge — Инженерный справочник.

   Layers on top of docs.center/style.css (which supplies the .skbpa-docs shell,
   breadcrumbs and back-links) and only adds what the справочник itself needs. */

.skbpa-kb {
  --skbpa-kb-accent: #e36d38;
  --skbpa-kb-ink: #211d19;
  --skbpa-kb-ink-soft: #5c564d;
  --skbpa-kb-ink-faint: #918a7d;
  --skbpa-kb-line: #e7e2da;
  --skbpa-kb-surface-2: #f7f5f2;
}

.skbpa-kb-head { margin: 0 0 28px; }
.skbpa-kb-head h1 { margin: 0 0 12px; }

.skbpa-kb-lead {
  margin: 0 0 10px;
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.6;
  color: var(--skbpa-kb-ink-soft);
}

.skbpa-kb-note {
  margin: 0;
  max-width: 70ch;
  padding: 12px 14px;
  border-left: 3px solid var(--skbpa-kb-accent);
  background: var(--skbpa-kb-surface-2);
  font-size: 14px;
  line-height: 1.55;
  color: var(--skbpa-kb-ink-soft);
}

/* --- topic sections --------------------------------------------------- */

.skbpa-kb-topic { margin: 0 0 34px; }

.skbpa-kb-topic-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 6px;
  font-size: 20px;
}

.skbpa-kb-topic-title a { color: inherit; text-decoration: none; }
.skbpa-kb-topic-title a:hover { color: var(--skbpa-kb-accent); }

.skbpa-kb-topic-count {
  font-size: 13px;
  font-weight: 500;
  color: var(--skbpa-kb-ink-faint);
}

.skbpa-kb-topic-desc {
  margin: 0 0 14px;
  max-width: 70ch;
  font-size: 14px;
  color: var(--skbpa-kb-ink-soft);
}

/* --- article cards ---------------------------------------------------- */

.skbpa-kb-cards {
  display: grid;
  /* Bounded track, not 1fr. Most domains hold a single article, and with a
     plain 1fr the card either stretched across the whole content column (a
     three-line card 880px wide reads badly) or, with auto-fill, sat at the
     minimum and left two thirds of the row empty. Capping the track at 460px
     and packing from the left gives a card that looks deliberate whether the
     domain has one article or four. */
  grid-template-columns: repeat(auto-fill, minmax(300px, 460px));
  justify-content: start;
  gap: 12px;
}

.skbpa-kb-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--skbpa-kb-line);
  border-radius: 8px;
  background: #fff;
  color: inherit;
  text-decoration: none;
}

.skbpa-kb-card:hover,
.skbpa-kb-card:focus-visible {
  border-color: var(--skbpa-kb-accent);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

.skbpa-kb-card-title { font-weight: 600; line-height: 1.35; }

.skbpa-kb-card-lead {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--skbpa-kb-ink-soft);
}

.skbpa-kb-badge {
  align-self: flex-start;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.skbpa-kb-badge--safety { background: #fdecea; color: #a32c1c; }
.skbpa-kb-badge--caution { background: #fdf3e3; color: #8a5a12; }

/* --- article ---------------------------------------------------------- */

.skbpa-kb-article { max-width: 78ch; }
.skbpa-kb-article h1 { margin: 0 0 18px; }

.skbpa-kb-short {
  margin: 0 0 22px;
  padding: 16px 18px;
  border: 1px solid var(--skbpa-kb-line);
  border-left: 3px solid var(--skbpa-kb-accent);
  background: var(--skbpa-kb-surface-2);
  border-radius: 0 8px 8px 0;
}

.skbpa-kb-short-label {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--skbpa-kb-ink-faint);
}

.skbpa-kb-short p { margin: 0; font-size: 16px; line-height: 1.6; }

.skbpa-kb-callout {
  margin: 0 0 20px;
  padding: 14px 16px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.55;
}

.skbpa-kb-callout--safety { background: #fdecea; color: #7d2417; }
.skbpa-kb-callout--caution { background: #fdf3e3; color: #6d470e; }
.skbpa-kb-callout--conflict { background: #eef2fa; color: #2b3f66; }

.skbpa-kb-body { font-size: 15.5px; line-height: 1.7; }
.skbpa-kb-body h2 { margin: 28px 0 10px; font-size: 19px; }
.skbpa-kb-body h3 { margin: 22px 0 8px; font-size: 16.5px; }
.skbpa-kb-body p { margin: 0 0 12px; }
.skbpa-kb-body ul,
.skbpa-kb-body ol { margin: 0 0 14px; padding-left: 22px; }
.skbpa-kb-body li { margin: 0 0 6px; }
.skbpa-kb-body code {
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--skbpa-kb-surface-2);
  font-size: 0.92em;
}

/* Wide comparison tables scroll inside their own box; the page itself must
   never scroll horizontally (§17). */
.skbpa-kb-body table {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 0 0 16px;
}

.skbpa-kb-body th,
.skbpa-kb-body td {
  padding: 8px 12px;
  border: 1px solid var(--skbpa-kb-line);
  text-align: left;
  vertical-align: top;
}

.skbpa-kb-body th { background: var(--skbpa-kb-surface-2); font-weight: 600; }

/* --- relations -------------------------------------------------------- */

.skbpa-kb-rel { margin: 28px 0 0; }
.skbpa-kb-rel h2 { margin: 0 0 8px; font-size: 16px; }

.skbpa-kb-rel-note {
  margin: 0 0 10px;
  font-size: 13.5px;
  color: var(--skbpa-kb-ink-soft);
}

.skbpa-kb-rel-list { margin: 0; padding-left: 20px; }
.skbpa-kb-rel-list li { margin: 0 0 6px; line-height: 1.5; }

.skbpa-kb-sources { padding-top: 18px; border-top: 1px solid var(--skbpa-kb-line); }
.skbpa-kb-sources .skbpa-kb-rel-list { font-size: 14px; color: var(--skbpa-kb-ink-soft); }

.skbpa-kb-source-key {
  margin-left: 6px;
  font-size: 11.5px;
  color: var(--skbpa-kb-ink-faint);
  white-space: nowrap;
}



/* ======================================================================
   Index layout: sticky domain navigation + content.

   Before this, the index was one long column of domains and finding
   "Modbus TCP" meant scrolling past everything above it. The interactive
   manuals had already solved the same problem with a sticky TOC, so this
   follows that pattern rather than inventing a second navigation idiom.
   ====================================================================== */

.skbpa-kb-layout {
  display: grid;
  grid-template-columns: 248px minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}

.skbpa-kb-nav {
  position: sticky;
  top: 90px;
  /* Its own scroll when there are more domains than viewport height. The
     max-height leaves room for the sticky theme header above. */
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 4px;
}

/* The toggle is the mobile affordance only; on desktop the list is always open
   and the button would be noise. */
.skbpa-kb-nav-toggle { display: none; }

.skbpa-kb-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 2px solid var(--skbpa-kb-line);
}

.skbpa-kb-nav-item a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 12px;
  margin-left: -2px;
  border-left: 2px solid transparent;
  color: var(--skbpa-kb-ink-soft);
  font-size: 13.5px;
  line-height: 1.35;
  text-decoration: none;
}

.skbpa-kb-nav-item a:hover,
.skbpa-kb-nav-item a:focus-visible {
  color: var(--skbpa-kb-accent);
  background: var(--skbpa-kb-surface-2);
}

/* Long domain names wrap rather than forcing the sidebar to scroll sideways —
   the same defect that had to be fixed in the manual TOC. */
.skbpa-kb-nav-label {
  flex: 1 1 auto;
  min-width: 0;
  overflow-wrap: anywhere;
}

.skbpa-kb-nav-num {
  flex: 0 0 auto;
  font-size: 11.5px;
  color: var(--skbpa-kb-ink-faint);
}

.skbpa-kb-nav-item--active a {
  color: var(--skbpa-kb-accent);
  border-left-color: var(--skbpa-kb-accent);
  background: var(--skbpa-kb-surface-2);
  font-weight: 600;
}

/* Anchored sections must clear the sticky theme header when jumped to. */
.skbpa-kb-topic { scroll-margin-top: 96px; }

@media (max-width: 900px) {
  .skbpa-kb-layout {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .skbpa-kb-nav {
    position: static;
    max-height: none;
    overflow: visible;
    padding-right: 0;
    border: 1px solid var(--skbpa-kb-line);
    border-radius: 8px;
    background: #fff;
  }

  .skbpa-kb-nav-toggle {
    display: flex;
    align-items: center;
    gap: 9px;
    width: 100%;
    padding: 13px 14px;
    border: 0;
    background: none;
    color: var(--skbpa-kb-ink);
    font: inherit;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
  }

  .skbpa-kb-nav-count {
    margin-left: auto;
    font-size: 12px;
    font-weight: 500;
    color: var(--skbpa-kb-ink-faint);
  }

  .skbpa-kb-nav-caret {
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 5px 5px 0 5px;
    border-color: var(--skbpa-kb-accent) transparent transparent transparent;
    transition: transform .15s ease;
  }

  .skbpa-kb-nav--open .skbpa-kb-nav-caret { transform: rotate(180deg); }

  /* Collapsed by default on mobile: a permanent list of every domain would
     push the actual content a screen down. */
  .skbpa-kb-nav-body { display: none; }
  .skbpa-kb-nav--open .skbpa-kb-nav-body { display: block; }

  .skbpa-kb-nav-list {
    border-left: 0;
    border-top: 1px solid var(--skbpa-kb-line);
    padding: 4px 0 6px;
  }

  .skbpa-kb-nav-item a { padding: 9px 14px; }
}

@media (max-width: 600px) {
  .skbpa-kb-cards { grid-template-columns: 1fr; }
  .skbpa-kb-article { max-width: 100%; }
}