/* Carding Knowledge Library */

:root {
  --knowledge-ink: #151a20;
  --knowledge-muted: #5f6b76;
  --knowledge-line: rgba(15, 18, 21, 0.1);
  --knowledge-panel: #ffffff;
  --knowledge-panel-soft: #f4f1eb;
  --knowledge-accent: #c62828;
  --knowledge-accent-dark: #8e0000;
  --knowledge-steel: #d7d3ca;
}

html {
  scroll-behavior: smooth;
}

.knowledge-library-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.knowledge-library-hero {
  background:
    linear-gradient(180deg, rgba(198, 40, 40, 0.05), rgba(198, 40, 40, 0.01)),
    linear-gradient(135deg, #f7f4ef 0%, #ffffff 54%, #f1ece4 100%);
  border-bottom: 1px solid var(--knowledge-line);
}

.knowledge-library-breadcrumb {
  justify-content: flex-start;
  padding-top: 26px;
  margin-bottom: 24px;
}

.knowledge-library-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(300px, 0.8fr);
  gap: 28px;
  align-items: end;
  padding-bottom: 40px;
}

.knowledge-library-eyebrow,
.knowledge-section-kicker,
.knowledge-commercial-bridge__kicker,
.knowledge-library-panel__label {
  margin: 0 0 10px;
  color: var(--knowledge-accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.knowledge-library-hero__copy h1 {
  margin: 0;
  color: var(--knowledge-ink);
  font-size: clamp(2.6rem, 4vw, 4.3rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.knowledge-library-hero__subtitle {
  max-width: 61ch;
  margin: 18px 0 0;
  color: var(--knowledge-muted);
  font-size: 1.08rem;
  line-height: 1.8;
}

.knowledge-library-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.knowledge-library-hero__support {
  margin: 18px 0 0;
  color: var(--knowledge-muted);
  font-size: 0.95rem;
}

.knowledge-library-panel {
  padding: 24px;
  border: 1px solid var(--knowledge-line);
  background:
    linear-gradient(135deg, rgba(21, 26, 32, 0.02), rgba(21, 26, 32, 0.06)),
    var(--knowledge-panel);
  box-shadow: 0 18px 40px rgba(15, 18, 21, 0.05);
}

.knowledge-library-anchor-nav {
  display: grid;
  gap: 10px;
}

.knowledge-library-anchor-nav a,
.knowledge-link-list a,
.knowledge-note-card h3 a,
.knowledge-symptom-tile,
.knowledge-maintenance-link {
  text-decoration: none;
}

.knowledge-library-anchor-nav a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-top: 1px solid var(--knowledge-line);
  color: var(--knowledge-ink);
  font-weight: 700;
}

.knowledge-library-anchor-nav a::after {
  content: "↗";
  color: var(--knowledge-accent);
}

.knowledge-library-panel__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.knowledge-library-panel__stats span {
  padding: 7px 10px;
  border: 1px solid var(--knowledge-line);
  color: var(--knowledge-muted);
  font-size: 0.86rem;
}

.knowledge-library-main {
  background: linear-gradient(180deg, #fff 0%, #f8f6f2 100%);
}

.knowledge-section-block {
  padding: 56px 0 0;
}

.knowledge-section-heading {
  margin-bottom: 24px;
}

.knowledge-section-heading h2 {
  margin: 0;
  color: var(--knowledge-ink);
  font-size: clamp(1.8rem, 2.3vw, 2.6rem);
  letter-spacing: -0.03em;
}

.knowledge-section-intro {
  max-width: 68ch;
  margin: 12px 0 0;
  color: var(--knowledge-muted);
}

.knowledge-usage-grid,
.knowledge-field-notes-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.knowledge-info-card,
.knowledge-note-card {
  padding: 24px;
  border: 1px solid var(--knowledge-line);
  background: var(--knowledge-panel);
}

.knowledge-info-card h3,
.knowledge-note-card h3 {
  margin: 0 0 10px;
  color: var(--knowledge-ink);
  font-size: 1.1rem;
}

.knowledge-info-card p,
.knowledge-note-card p,
.knowledge-maintenance-copy p {
  margin: 0;
  color: var(--knowledge-muted);
  line-height: 1.75;
}

.knowledge-pillar-accordion,
.knowledge-symptom-grid {
  display: grid;
  gap: 18px;
}

.knowledge-symptom-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.knowledge-pillar-disclosure {
  border: 1px solid var(--knowledge-line);
  background: var(--knowledge-panel);
}

.knowledge-pillar-summary {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
}

.knowledge-pillar-summary::-webkit-details-marker {
  display: none;
}

.knowledge-pillar-summary__title {
  color: var(--knowledge-ink);
  font-size: 1.06rem;
  font-weight: 800;
}

.knowledge-pillar-summary__meta {
  color: var(--knowledge-muted);
  font-size: 0.88rem;
  white-space: nowrap;
}

.knowledge-pillar-summary::after {
  content: "+";
  margin-left: auto;
  color: var(--knowledge-accent);
  font-size: 1.35rem;
  font-weight: 500;
}

.knowledge-pillar-disclosure[open] .knowledge-pillar-summary::after {
  content: "−";
}

.knowledge-pillar-panel {
  padding: 0 22px 20px;
  border-top: 1px solid rgba(15, 18, 21, 0.08);
}

.knowledge-pillar-panel p {
  margin: 14px 0 0;
  color: var(--knowledge-muted);
  line-height: 1.75;
}

.knowledge-link-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.knowledge-link-list li {
  border-top: 1px solid rgba(15, 18, 21, 0.08);
}

.knowledge-link-list a {
  display: block;
  padding-top: 10px;
  color: var(--knowledge-ink);
  font-weight: 700;
  line-height: 1.5;
}

.knowledge-link-list a:hover,
.knowledge-note-card h3 a:hover,
.knowledge-maintenance-link:hover span,
.knowledge-symptom-tile:hover .knowledge-symptom-tile__title {
  color: var(--knowledge-accent);
}

.knowledge-symptom-tile {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  border: 1px solid var(--knowledge-line);
  background: linear-gradient(180deg, #fff, #faf8f4);
  color: var(--knowledge-ink);
}

.knowledge-symptom-tile__title {
  font-weight: 800;
  line-height: 1.4;
}

.knowledge-symptom-tile__link {
  color: var(--knowledge-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

.knowledge-maintenance-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 18px;
}

.knowledge-maintenance-copy,
.knowledge-maintenance-links,
.knowledge-commercial-bridge {
  padding: 24px;
  border: 1px solid var(--knowledge-line);
  background: var(--knowledge-panel);
}

.knowledge-maintenance-links {
  display: grid;
  gap: 12px;
}

.knowledge-maintenance-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid rgba(15, 18, 21, 0.08);
}

.knowledge-maintenance-link:first-child {
  border-top: 0;
  padding-top: 0;
}

.knowledge-maintenance-link span {
  color: var(--knowledge-ink);
  font-weight: 800;
}

.knowledge-maintenance-link small {
  color: var(--knowledge-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.knowledge-note-card__meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  color: var(--knowledge-muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.knowledge-note-card h3 a {
  color: var(--knowledge-ink);
}

.knowledge-commercial-bridge {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) auto;
  gap: 24px;
  align-items: center;
  margin: 56px 0 80px;
  background:
    linear-gradient(135deg, rgba(198, 40, 40, 0.04), rgba(15, 18, 21, 0.03)),
    var(--knowledge-panel-soft);
}

.knowledge-commercial-bridge__text {
  margin: 0;
  color: var(--knowledge-ink);
  line-height: 1.75;
}

.knowledge-commercial-bridge__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
}

.knowledge-scroll-top {
  position: fixed;
  right: 22px;
  bottom: 24px;
  width: 54px;
  height: 54px;
  border: 1px solid rgba(15, 18, 21, 0.14);
  border-radius: 999px;
  background: rgba(15, 18, 21, 0.9);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s ease, background 0.18s ease;
  box-shadow: 0 14px 34px rgba(15, 18, 21, 0.24);
  z-index: 999;
}

.knowledge-scroll-top:hover {
  background: var(--knowledge-accent);
}

.knowledge-scroll-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Article page */

.knowledge-article-nav {
  max-width: 920px;
  margin: 0 auto 18px;
}

.knowledge-back-link {
  color: var(--knowledge-accent-dark);
  text-decoration: none;
  font-weight: 700;
}

.knowledge-back-link:hover {
  text-decoration: underline;
}

.knowledge-article-hero .page-header-inner {
  max-width: 940px;
  padding-top: 34px;
  padding-bottom: 30px;
}

.knowledge-article-hero .breadcrumb {
  justify-content: flex-start;
}

.knowledge-article-hero .page-title {
  max-width: 18ch;
  margin: 0;
  text-align: left;
  font-size: clamp(2.2rem, 3.4vw, 3.35rem);
  line-height: 1.04;
}

.knowledge-article-hero .page-subtitle {
  max-width: 64ch;
  margin: 16px 0 0;
  text-align: left;
  font-size: 1rem;
  line-height: 1.85;
}

.knowledge-article-hero .article-stats {
  justify-content: flex-start;
  margin-top: 18px;
}

.knowledge-article-page .knowledge-container.knowledge-single-page {
  max-width: 1160px;
  padding-top: 36px;
}

.knowledge-article {
  margin-bottom: 48px;
}

.article-featured-image {
  max-width: 920px;
  margin: 0 auto 28px;
  border: 1px solid var(--knowledge-line);
  background: #fff;
  box-shadow: 0 16px 36px rgba(15, 18, 21, 0.06);
}

.article-featured-image img {
  display: block;
  width: 100%;
  height: auto;
}

.knowledge-article-body {
  max-width: 920px;
  margin: 0 auto;
  padding: 34px 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(250, 248, 244, 0.98));
  border-top: 1px solid rgba(15, 18, 21, 0.08);
  border-bottom: 1px solid rgba(15, 18, 21, 0.08);
}

.knowledge-article-body .kb {
  max-width: 720px;
  margin: 0 auto;
  color: #24303a;
  font-size: 1.06rem;
  line-height: 1.9;
}

.knowledge-article-body .kb > *:first-child {
  margin-top: 0;
}

.knowledge-article-body .kb > *:last-child {
  margin-bottom: 0;
}

.knowledge-article-body .kb p,
.knowledge-article-body .kb ul,
.knowledge-article-body .kb ol,
.knowledge-article-body .kb blockquote,
.knowledge-article-body .kb pre,
.knowledge-article-body .kb table {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.knowledge-article-body .kb h2,
.knowledge-article-body .kb h3,
.knowledge-article-body .kb h4 {
  color: var(--knowledge-ink);
  letter-spacing: -0.02em;
  line-height: 1.22;
}

.knowledge-article-body .kb h2 {
  margin-top: 2.6rem;
  margin-bottom: 1rem;
  font-size: 1.85rem;
}

.knowledge-article-body .kb h3 {
  margin-top: 2rem;
  margin-bottom: 0.8rem;
  font-size: 1.35rem;
}

.knowledge-article-body .kb a {
  color: var(--knowledge-accent-dark);
  text-decoration-color: rgba(198, 40, 40, 0.35);
  text-underline-offset: 0.16em;
}

.knowledge-article-body .kb ul,
.knowledge-article-body .kb ol {
  padding-left: 1.35rem;
}

.knowledge-article-body .kb li {
  margin-bottom: 0.55rem;
}

.knowledge-article-body .kb blockquote {
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--knowledge-accent);
  color: #4d5b67;
  font-style: italic;
}

.knowledge-article-body .kb code {
  padding: 0.08rem 0.34rem;
  background: rgba(15, 18, 21, 0.06);
  border-radius: 4px;
  font-size: 0.92em;
}

.knowledge-article-body .kb img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.6rem auto;
}

.article-related-section,
.article-tags-section {
  max-width: 920px;
  margin: 0 auto 28px;
  padding: 24px;
  border: 1px solid var(--knowledge-line);
  background: #fff;
}

.related-section-title,
.tags-title {
  margin: 0 0 18px;
  color: var(--knowledge-ink);
}

.related-items-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.related-item-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 16px;
  padding: 18px;
  border: 1px solid rgba(15, 18, 21, 0.08);
  color: inherit;
  text-decoration: none;
  background: linear-gradient(180deg, #fff, #faf8f4);
}

.related-item-card:hover {
  border-color: rgba(198, 40, 40, 0.24);
}

.related-item-title {
  margin: 0 0 8px;
  color: var(--knowledge-ink);
}

.related-item-description,
.related-article-meta,
.related-article-category {
  color: var(--knowledge-muted);
}

.related-article-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.9rem;
}

.machine-models-list,
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.machine-model-tag,
.article-tag {
  padding: 8px 12px;
  border: 1px solid var(--knowledge-line);
  background: #faf8f4;
  color: var(--knowledge-ink);
  font-size: 0.9rem;
}

@media (max-width: 1080px) {
  .knowledge-library-hero__inner,
  .knowledge-maintenance-layout,
  .knowledge-commercial-bridge,
  .knowledge-symptom-grid,
  .knowledge-usage-grid,
  .knowledge-field-notes-grid {
    grid-template-columns: 1fr;
  }

  .knowledge-commercial-bridge__actions {
    justify-content: flex-start;
  }

  .related-items-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .knowledge-library-shell {
    padding: 0 18px;
  }

  .knowledge-library-breadcrumb {
    padding-top: 18px;
  }

  .knowledge-library-hero__copy h1 {
    font-size: 2.3rem;
  }

  .knowledge-section-block {
    padding-top: 42px;
  }

  .knowledge-info-card,
  .knowledge-note-card,
  .knowledge-maintenance-copy,
  .knowledge-maintenance-links,
  .knowledge-commercial-bridge,
  .knowledge-library-panel,
  .knowledge-symptom-tile {
    padding: 18px;
  }

  .knowledge-pillar-summary,
  .knowledge-pillar-panel {
    padding-left: 18px;
    padding-right: 18px;
  }

  .knowledge-scroll-top {
    right: 16px;
    bottom: 18px;
  }

  .knowledge-article-body {
    padding: 24px 0;
  }

  .knowledge-article-body .kb {
    max-width: none;
    padding: 0 6px;
    font-size: 1rem;
    line-height: 1.82;
  }

  .article-related-section,
  .article-tags-section {
    padding: 18px;
  }
}