/* ═══════════════════════════════════════════════════════════════
   kb.css — Knowledge Base page styles
   Uses existing design tokens from the site (--bg, --surface, --text, etc.)
   Lora for headings, Inter for body (same as main site)
   ═══════════════════════════════════════════════════════════════ */

/* ── Layout ── */
.kb-main {
  padding-top: 80px; /* clear fixed nav */
  min-height: 100vh;
}

.kb-container {
  max-width: 800px;
  margin: 0 auto;
  padding: clamp(40px, 5vw, 80px) 24px clamp(60px, 8vw, 120px);
}

/* ── Breadcrumb ── */
.kb-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 13px;
  color: var(--text-faint);
  margin-bottom: 32px;
}

.kb-breadcrumb a {
  color: var(--primary);
  transition: opacity 0.2s;
}

.kb-breadcrumb a:hover {
  opacity: 0.75;
}

.kb-breadcrumb__sep {
  color: var(--text-faint);
  font-size: 11px;
}

.kb-breadcrumb__current {
  color: var(--text-muted);
  /* truncate long titles */
  max-width: 320px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ── Article header ── */
.kb-article__header {
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.kb-article__meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.kb-article__category {
  font-size: 11px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 12px;
  background: var(--primary-08);
  border: 1px solid var(--primary-04);
  border-radius: var(--r-full);
}

.kb-article__date {
  font-size: 12px;
  color: var(--text-faint);
}

.kb-article__title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 1rem + 2.5vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 16px;
}

.kb-article__excerpt {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.7;
  font-style: italic;
}

/* ── Prose body — article typography ── */
.prose {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-muted);
}

.prose h2 {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 0.8rem + 1.2vw, 1.7rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 2.4em 0 0.75em;
  padding-bottom: 0.4em;
  border-bottom: 1px solid var(--border);
  line-height: 1.25;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose h3 {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 0.7rem + 0.8vw, 1.3rem);
  font-weight: 600;
  color: var(--text);
  margin: 2em 0 0.6em;
  line-height: 1.3;
}

.prose h4 {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin: 1.6em 0 0.5em;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 11px;
}

.prose p {
  margin-bottom: 1.4em;
}

.prose p:last-child {
  margin-bottom: 0;
}

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

.prose em {
  color: var(--text-muted);
}

.prose ul,
.prose ol {
  list-style: none;
  margin: 1.2em 0 1.4em;
  padding-left: 0;
}

.prose ul > li,
.prose ol > li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 0.6em;
  font-size: 15px;
  line-height: 1.75;
}

.prose ul > li::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 11px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--primary);
  opacity: 0.7;
}

.prose ol {
  counter-reset: ol-counter;
}

.prose ol > li::before {
  counter-increment: ol-counter;
  content: counter(ol-counter) '.';
  position: absolute;
  left: 0;
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  top: 1px;
}

.prose a {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: opacity 0.2s;
}

.prose a:hover {
  opacity: 0.75;
}

.prose blockquote {
  border-left: 3px solid var(--primary);
  padding: 12px 20px;
  margin: 1.5em 0;
  background: var(--primary-04);
  border-radius: 0 var(--r) var(--r) 0;
  color: var(--text-muted);
  font-style: italic;
}

.prose code {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  font-size: 0.875em;
  padding: 2px 6px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--primary);
}

.prose pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
  padding: 20px 24px;
  margin: 1.5em 0;
  overflow-x: auto;
}

.prose pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 14px;
  color: var(--text);
}

.prose hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5em 0;
}

/* ── Related Terms ── */
.kb-related-terms {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.kb-related-terms__heading {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.kb-related-terms__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.kb-term-chip {
  font-size: 13px;
  font-weight: 500;
  padding: 6px 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-full);
  color: var(--text-muted);
  transition: all 0.2s var(--ease);
}

.kb-term-chip:hover {
  border-color: var(--primary-15);
  color: var(--primary);
  background: var(--primary-04);
}

/* ── Back link ── */
.kb-back {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.kb-back__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--primary);
  transition: opacity 0.2s;
}

.kb-back__link:hover {
  opacity: 0.75;
}

/* ── Article Index page ── */
.kb-index-header {
  margin-bottom: 56px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.kb-index-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1rem + 2.5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 16px;
  line-height: 1.1;
}

.kb-index-desc {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 560px;
}

.kb-index-links {
  margin-top: 20px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.kb-index-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  transition: opacity 0.2s;
}

.kb-index-link:hover {
  opacity: 0.75;
}

.kb-category-section {
  margin-bottom: 56px;
}

.kb-category-heading {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.kb-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.kb-card {
  display: block;
  padding: 28px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: all 0.3s var(--ease);
}

.kb-card:hover {
  border-color: var(--primary-15);
  box-shadow: 0 4px 24px var(--primary-04);
  transform: translateY(-2px);
}

.kb-card__category {
  font-size: 11px;
  font-weight: 600;
  color: var(--primary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.kb-card__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.35;
  margin-bottom: 10px;
}

.kb-card__excerpt {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.kb-card__read {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
}

/* ── Glossary page ── */
.kb-alpha {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 48px;
  padding: 16px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r);
}

.kb-alpha__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--r);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.2s var(--ease);
}

.kb-alpha__link:hover {
  background: var(--primary-08);
  color: var(--primary);
}

.kb-glossary {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.kb-glossary-section {
  margin-bottom: 40px;
  scroll-margin-top: 100px;
}

.kb-glossary-letter {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 1rem + 1.5vw, 2.2rem);
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-15);
  line-height: 1;
}

.kb-glossary-term {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 100px;
}

.kb-glossary-term:last-child {
  border-bottom: none;
}

.kb-glossary-term__name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.kb-glossary-term__short {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
  font-style: italic;
}

/* Prose for glossary body (lighter than article prose) */
.prose-sm {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-faint);
}

.prose-sm p {
  margin-bottom: 0.8em;
}

.prose-sm p:last-child {
  margin-bottom: 0;
}

.prose-sm strong {
  color: var(--text-muted);
  font-weight: 600;
}

.prose-sm a {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .kb-container {
    padding-top: 32px;
  }

  .kb-article__title {
    font-size: clamp(1.5rem, 1rem + 3vw, 2rem);
  }

  .kb-card-grid {
    grid-template-columns: 1fr;
  }

  .kb-alpha {
    padding: 12px 16px;
  }

  .kb-alpha__link {
    width: 32px;
    height: 32px;
    font-size: 13px;
  }

  .kb-breadcrumb__current {
    max-width: 200px;
  }
}