/* ═══════════════════════════════════════════
   KNOWLEDGE BASE — index + article styles
   Shared by: knowledge/index.html, knowledge/*.html
═══════════════════════════════════════════ */

/* ─── Knowledge index header ─────────────────────────────────────── */
.knowledge-header {
  padding: 7rem 0 4rem;
  text-align: center;
}

.knowledge-header .eyebrow {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.knowledge-header h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--navy);
  margin-bottom: 1rem;
}

.knowledge-header .knowledge-sub {
  font-size: 1.1rem;
  color: rgba(10,22,40,.65);
  max-width: 540px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ─── Category tabs (same pattern as shop) ───────────────────────── */
.knowledge-tabs {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 3rem;
}

.knowledge-tab {
  padding: .5rem 1.25rem;
  border-radius: var(--r-sm);
  border: 1px solid rgba(10,22,40,.12);
  background: transparent;
  color: rgba(10,22,40,.65);
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  transition: background .18s, color .18s, border-color .18s;
}

.knowledge-tab:hover {
  background: var(--bg-off);
  color: var(--navy);
  border-color: rgba(10,22,40,.22);
}

.knowledge-tab[aria-selected="true"] {
  background: var(--navy);
  color: #fff;
  border-color: var(--navy);
}

/* ─── Article grid ───────────────────────────────────────────────── */
.knowledge-section {
  padding: 0 0 6rem;
}

.knowledge-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

/* ─── Article card ───────────────────────────────────────────────── */
.article-card {
  background: var(--white);
  border: 1px solid rgba(10,22,40,.08);
  border-radius: var(--r-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-decoration: none;
  color: inherit;
  transition: box-shadow .2s, transform .2s, border-color .2s;
}

.article-card:hover {
  box-shadow: 0 8px 32px rgba(10,22,40,.08);
  transform: translateY(-2px);
  border-color: rgba(10,22,40,.14);
}

.article-card-meta {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}

.article-category-badge {
  display: inline-block;
  padding: .25rem .75rem;
  border-radius: 100px;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.badge-standards  { background: rgba(245,196,0,.15);  color: #7a5f00; }
.badge-tco        { background: rgba(10,22,40,.07);   color: var(--navy); }
.badge-compliance { background: rgba(16,185,129,.12); color: #065f46; }
.badge-case-study { background: rgba(99,102,241,.1);  color: #3730a3; }

.article-date,
.article-read-time {
  font-size: .8rem;
  color: rgba(10,22,40,.45);
}

.article-card h2 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.35;
  letter-spacing: -.01em;
  margin: 0;
}

.article-card .article-excerpt {
  font-size: .9rem;
  color: rgba(10,22,40,.65);
  line-height: 1.6;
  margin: 0;
  flex: 1;
}

.article-card-cta {
  font-size: .875rem;
  font-weight: 600;
  color: var(--navy);
  display: flex;
  align-items: center;
  gap: .375rem;
  margin-top: auto;
}

.article-card-cta svg {
  transition: transform .18s;
}

.article-card:hover .article-card-cta svg {
  transform: translateX(3px);
}

/* ─── Empty state ────────────────────────────────────────────────── */
.knowledge-empty {
  text-align: center;
  padding: 4rem 0;
  color: rgba(10,22,40,.45);
  font-size: .95rem;
}

/* ═══════════════════════════════════════════
   ARTICLE PAGE
═══════════════════════════════════════════ */

/* ─── Article hero ───────────────────────────────────────────────── */
.article-hero {
  background: var(--navy);
  padding: 8rem 0 4rem;
  color: #fff;
}

.article-hero-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.article-hero-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}

.article-hero-meta .article-category-badge {
  background: rgba(245,196,0,.2);
  color: var(--accent);
}

.article-hero-meta .article-date,
.article-hero-meta .article-read-time {
  color: rgba(255,255,255,.55);
  font-size: .85rem;
}

.article-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  color: #fff;
  line-height: 1.15;
  letter-spacing: -.025em;
  margin-bottom: 1.25rem;
}

.article-hero-description {
  font-size: 1.1rem;
  color: rgba(255,255,255,.75);
  line-height: 1.65;
}

/* ─── Article body ───────────────────────────────────────────────── */
.article-body {
  padding: 4rem 0 2rem;
}

.article-body-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Prose typography */
.prose h2 {
  font-size: 1.5rem;
  color: var(--navy);
  margin: 2.5rem 0 1rem;
  letter-spacing: -.02em;
}

.prose h3 {
  font-size: 1.15rem;
  color: var(--navy);
  margin: 2rem 0 .75rem;
  letter-spacing: -.01em;
}

.prose p {
  font-size: 1rem;
  color: rgba(10,22,40,.8);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

.prose ul,
.prose ol {
  margin: 1rem 0 1.25rem 1.5rem;
  color: rgba(10,22,40,.8);
  line-height: 1.75;
}

.prose li {
  margin-bottom: .4rem;
}

.prose strong {
  color: var(--navy);
  font-weight: 600;
}

.prose a {
  color: var(--navy);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover {
  color: rgba(10,22,40,.7);
}

.prose hr {
  border: none;
  border-top: 1px solid rgba(10,22,40,.1);
  margin: 2.5rem 0;
}

/* Tables */
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: .9rem;
}

.prose th {
  text-align: left;
  padding: .6rem .75rem;
  background: var(--navy);
  color: #fff;
  font-weight: 600;
  font-size: .8rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.prose th:first-child { border-radius: var(--r-sm) 0 0 0; }
.prose th:last-child  { border-radius: 0 var(--r-sm) 0 0; }

.prose td {
  padding: .6rem .75rem;
  border-bottom: 1px solid rgba(10,22,40,.07);
  color: rgba(10,22,40,.8);
  vertical-align: top;
}

.prose tr:last-child td { border-bottom: none; }

.prose tr:nth-child(even) td { background: var(--bg-off); }

/* Code blocks */
.prose pre {
  background: var(--navy);
  border-radius: var(--r);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.prose code {
  font-family: 'Menlo', 'Monaco', 'Consolas', monospace;
  font-size: .85rem;
  color: var(--accent);
}

.prose p code,
.prose li code {
  background: rgba(10,22,40,.07);
  color: var(--navy);
  padding: .15em .4em;
  border-radius: 4px;
  font-size: .85em;
}

/* ─── Article share / back bar ───────────────────────────────────── */
.article-actions {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.btn-share-linkedin {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .6rem 1.25rem;
  border: 1px solid rgba(10,22,40,.15);
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--navy);
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: background .18s, border-color .18s;
}

.btn-share-linkedin:hover {
  background: var(--bg-off);
  border-color: rgba(10,22,40,.22);
}

.btn-back-knowledge {
  font-size: .875rem;
  color: rgba(10,22,40,.55);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  transition: color .18s;
}

.btn-back-knowledge:hover { color: var(--navy); }

/* ─── Article CTA section ────────────────────────────────────────── */
.article-cta {
  background: var(--bg-off);
  border-top: 1px solid rgba(10,22,40,.07);
  padding: 4rem 0;
}

.article-cta-inner {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 1.5rem;
  text-align: center;
}

.article-cta h2 {
  font-size: 1.75rem;
  color: var(--navy);
  letter-spacing: -.02em;
  margin-bottom: .75rem;
}

.article-cta p {
  color: rgba(10,22,40,.65);
  line-height: 1.65;
  margin-bottom: 2rem;
}

/* ─── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .article-hero { padding: 6rem 0 3rem; }
  .article-grid { grid-template-columns: 1fr; }
  .knowledge-tabs { gap: .375rem; }
  .knowledge-tab { padding: .4rem 1rem; font-size: .8rem; }
}