/* kb.css — EcoPulse Knowledge Base styles
   Extends ../css/styles.css — do not redeclare brand variables already defined there */

:root {
  --color-primary:      #103b49;
  --color-secondary:    #3C786E;
  --color-bg-light:     #eaf4f4;
  --color-bg-white:     #ffffff;
  --color-bg-dark:      #103b49;
  --gradient-brand:     linear-gradient(to right, #3C786E 0%, #103b49 100%);
  --color-text-primary: #103b49;
  --color-text-muted:   rgba(0, 0, 0, 0.6);
  --color-text-white:   #ffffff;
  --color-border:       rgba(16, 59, 73, 0.08);
  --font-display:       'Merriweather', Georgia, serif;
  --font-body:          'Merriweather Sans', system-ui, sans-serif;
  --font-mono:          'IBM Plex Mono', 'Courier New', monospace;
}

/* ─── KB Hero (landing page) ─────────────────────────────────────────────── */
.kb-hero {
  background: var(--gradient-brand);
  color: #fff;
  padding: 9rem 0 4rem;
  text-align: center;
}
.kb-hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.65);
  margin-bottom: 1rem;
}
.kb-hero-title {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 400;
  color: #fff;
  margin-bottom: 1rem;
}
.kb-hero-sub {
  font-family: var(--font-body);
  font-size: 1rem;
  color: rgba(255,255,255,0.75);
}

/* ─── KB Index (landing page) ───────────────────────────────────────────── */
.kb-index-main {
  padding: 3rem 0 5rem;
}
.kb-cluster {
  margin-bottom: 3.5rem;
}
.kb-cluster-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}
.kb-cluster-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.kb-cluster-title {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin: 0;
}

/* ─── Index search ──────────────────────────────────────────────────────── */
.kb-search-wrap {
  margin: 1.5rem 0 2rem;
  background: var(--color-bg-light);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
}
.kb-search-inner {
  position: relative;
  max-width: 100%;
}
.kb-search-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-secondary);
  font-size: 0.95rem;
  pointer-events: none;
}
.kb-search-input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.75rem;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--color-text-primary);
  background: #fff;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.kb-search-input:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(60,120,110,.15);
}
.kb-search-no-results {
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0.5rem 0 0;
  min-height: 1.2em;
}

/* ─── Search results panel ───────────────────────────────────────────────── */
.kb-search-results {
  margin: 0 0 2rem;
}
.kb-sr-count {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}
.kb-sr-empty {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--color-text-muted);
  padding: 2rem 0;
}
.kb-sr-item {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.1rem 1.4rem;
  margin-bottom: 0.75rem;
  background: var(--color-bg-white);
  transition: box-shadow 0.15s;
}
.kb-sr-item:hover {
  box-shadow: 0 2px 12px rgba(16,59,73,.08);
}
.kb-sr-meta {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-secondary);
  margin-bottom: 0.3rem;
}
.kb-sr-title {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 0.6rem;
}
.kb-sr-title a {
  color: var(--color-primary);
  text-decoration: none;
}
.kb-sr-title a:hover { text-decoration: underline; }
.kb-sr-snippets { }
.kb-sr-snippet {
  font-family: var(--font-display);
  font-size: 0.85rem;
  line-height: 1.65;
  color: var(--color-text-muted);
  margin: 0 0 0.35rem;
  border-left: 2px solid var(--color-border);
  padding-left: 0.75rem;
}
.kb-sr-snippet mark {
  background: #fff3b0;
  color: inherit;
  border-radius: 2px;
  padding: 0 1px;
}

/* ─── Index intro text ───────────────────────────────────────────────────── */
.kb-index-intro {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text-muted);
  max-width: 700px;
  margin: 0 auto 3.5rem;
  text-align: center;
}

/* ─── Cluster section + question list ────────────────────────────────────── */
.kb-cluster-section { margin-bottom: 3rem; }

.kb-cluster-intro {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0.5rem 0 1.1rem;
}

.kb-question-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}
.kb-question-item {
  border-bottom: 1px solid var(--color-border);
}
.kb-question-item:last-child { border-bottom: none; }

.kb-question-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 1.25rem;
  text-decoration: none;
  background: var(--color-bg-white);
  transition: background 0.15s ease, padding-left 0.15s ease;
}
.kb-question-link:hover {
  background: var(--color-bg-light);
  padding-left: 1.5rem;
}
.kb-question-text {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-text-primary);
  flex: 1;
  line-height: 1.4;
}
.kb-question-arrow {
  font-size: 0.65rem;
  color: var(--color-secondary);
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.kb-question-link:hover .kb-question-arrow {
  opacity: 1;
  transform: translateX(2px);
}

/* KB Card (kept for any legacy use) */
.kb-card {
  display: block;
  background: var(--color-bg-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  height: 100%;
}
.kb-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-secondary);
  box-shadow: 0 8px 24px rgba(16,59,73,0.1);
}
.kb-card-inner {
  padding: 1.5rem;
}
.kb-card-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 0.5rem;
}
.kb-card-title {
  font-family: var(--font-body);
  font-size: 0.975rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: 0.75rem;
  line-height: 1.4;
}
.kb-card-teaser {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin: 0;
}

/* ─── Article Header ─────────────────────────────────────────────────────── */
.kb-article-header {
  background: var(--gradient-brand);
  color: #fff;
  padding: 8rem 0 1.5rem;
}
.kb-article-title {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.6rem, 3.5vw, 2.8rem);
  font-weight: 400;
  color: #fff;
  max-width: 820px;
  margin-top: 0.5rem;
}

/* Cluster label */
.kb-cluster-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.7);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.kb-cluster-label::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cluster-color, #74C69D);
}

/* Article date line */
.kb-article-date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.08em;
  margin-top: 0.5rem;
  margin-bottom: 0;
}

/* Section label colour override inside gradient header */
.kb-article-header .section-label { color: #fff; }

/* ─── Breadcrumb bar ─────────────────────────────────────────────────────── */
.kb-breadcrumb {
  background: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
  padding: 0.6rem 0;
}
.kb-breadcrumb .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-body);
  font-size: 0.8rem;
}
.kb-breadcrumb-trail {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  flex: 1;
}
.kb-breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-shrink: 0;
}
.kb-breadcrumb-back {
  color: var(--color-secondary);
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
  transition: color 0.15s ease;
}
.kb-breadcrumb-back:hover { color: var(--color-primary); }
.kb-breadcrumb-sep { color: var(--color-text-muted); flex-shrink: 0; }
.kb-breadcrumb-current {
  color: var(--color-text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.kb-breadcrumb-prev,
.kb-breadcrumb-next {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease;
}
.kb-breadcrumb-prev:hover,
.kb-breadcrumb-next:hover { color: var(--color-secondary); }

/* ─── Article Main ───────────────────────────────────────────────────────── */
.kb-article-main {
  padding: 1.75rem 0 4rem;
}

/* Plain English summary */
.kb-summary {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.15rem;
  line-height: 1.8;
  border-left: 3px solid var(--color-secondary);
  background: var(--color-bg-light);
  padding: 1.5rem 2rem;
  margin: 0 0 1.25rem;
  border-radius: 0 6px 6px 0;
  color: var(--color-text-primary);
}

/* ─── Inline graphics ────────────────────────────────────────────────────── */
.kg-inline {
  margin: 2rem 0 2.5rem;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0;
}
/* Ensure the graphic's internal padding wrapper fills width */
.kg-inline > * { box-sizing: border-box; }
/* Strip the source file's body background so our border-radius shows */
.kg-inline svg { display: block; max-width: 100%; height: auto; }

/* "Open full page" link card — for linked-page graphics */
.kg-link-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-secondary);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 2rem 0 2.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.kg-link-card:hover {
  border-color: var(--color-secondary);
  box-shadow: 0 4px 16px rgba(16,59,73,0.08);
}
.kg-link-card__icon {
  width: 40px; height: 40px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-size: 0.85rem;
  flex-shrink: 0;
}
.kg-link-card__text {
  flex: 1;
  display: flex; flex-direction: column; gap: 2px;
}
.kg-link-card__label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-secondary);
}
.kg-link-card__name {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
}
.kg-link-card__btn {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary);
  background: #fff;
  border: 1.5px solid var(--color-primary);
  border-radius: 4px;
  padding: 0.4rem 0.9rem;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
  flex-shrink: 0;
}
.kg-link-card__btn:hover {
  background: var(--color-primary);
  color: #fff;
}

/* ─── Figures — shared base ──────────────────────────────────────────────── */
.kb-figure {
  margin: 2rem 0 2.5rem;
  border-radius: 10px;
  overflow: hidden;
}
.kb-figure-caption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-text-muted);
  text-align: center;
  padding: 0.6rem 1rem 0.75rem;
  background: var(--color-bg-light);
}

/* SVG fallback figure */
.kb-figure svg {
  width: 100%;
  height: auto;
  display: block;
  background: var(--color-bg-light);
  padding: 1.5rem;
}

/* PNG full-width image */
.kb-figure--png {
  border: 1px solid var(--color-border);
}
.kb-graphic-img {
  display: block;
  width: 100%;
  height: auto;
}

/* Interactive iframe figure */
.kb-figure--iframe {
  border: 1px solid var(--color-border);
  position: relative;
}
.kb-graphic-frame {
  display: block;
  width: 100%;
  min-height: 240px;
  border: none;
  opacity: 0;
  transition: opacity 0.35s ease;
}
.kb-figure-loader {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    90deg,
    var(--color-bg-light) 0%,
    rgba(60,120,110,0.07) 45%,
    var(--color-bg-light) 100%
  );
  background-size: 200% 100%;
  animation: kb-shimmer 1.5s ease-in-out infinite;
  min-height: 240px;
}
@keyframes kb-shimmer {
  0%   { background-position: 200% center; }
  100% { background-position: -200% center; }
}

/* Mobile: allow horizontal scroll for fixed-width iframes */
@media (max-width: 920px) {
  .kb-figure--iframe { overflow-x: auto; }
}

/* ─── Section icons ──────────────────────────────────────────────────────── */
.kb-section-icon {
  color: var(--color-secondary);
  font-size: 0.85em;
  margin-right: 0.55rem;
  opacity: 0.85;
  vertical-align: baseline;
  position: relative;
  top: -1px;
}

/* ─── References heading override ───────────────────────────────────────── */
.kb-references-heading {
  font-family: var(--font-mono) !important;
  font-size: 0.72rem !important;
  letter-spacing: 0.14em !important;
  text-transform: uppercase !important;
  color: var(--color-text-muted) !important;
  border-bottom: none !important;
  margin-bottom: 1rem !important;
}
.kb-references-heading .kb-section-icon {
  color: var(--color-text-muted);
  opacity: 0.6;
}

/* ─── Callout quote (secondary blockquotes in body) ─────────────────────── */
.kb-callout-quote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  line-height: 1.75;
  border-left: 3px solid var(--color-secondary);
  background: var(--color-bg-light);
  padding: 1rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 6px 6px 0;
  color: var(--color-text-primary);
}

/* ─── Toggle / details ───────────────────────────────────────────────────── */
.kb-toggle {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin: 0.75rem 0;
  overflow: hidden;
  transition: box-shadow 0.2s ease;
}
.kb-toggle:hover { box-shadow: 0 2px 12px rgba(16,59,73,0.07); }
.kb-toggle summary {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-primary);
  padding: 0.9rem 1.25rem;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-bg-white);
  transition: background 0.15s ease;
}
.kb-toggle[open] summary {
  background: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
}
.kb-toggle summary::-webkit-details-marker { display: none; }
.kb-toggle summary::before { display: none; content: none; }
.kb-toggle summary::after {
  content: '';
  width: 16px; height: 16px; flex-shrink: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='%233C786E' d='M1.5 5.5L8 12l6.5-6.5-1-1L8 10 2.5 4.5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  transition: transform 0.2s ease;
}
.kb-toggle[open] summary::after { transform: rotate(180deg); }
.kb-toggle-body {
  padding: 1rem 1.25rem;
  background: var(--color-bg-white);
  font-family: var(--font-display);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--color-text-primary);
}

/* Article body typography */
.kb-body h2 {
  font-family: var(--font-body);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.4rem;
  margin: 2.5rem 0 1rem;
}
.kb-body h3 {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin: 1.75rem 0 0.6rem;
}
.kb-body p {
  font-family: var(--font-display);
  line-height: 1.85;
  color: var(--color-text-primary);
}
.kb-body ul, .kb-body ol {
  font-family: var(--font-display);
  line-height: 1.8;
  color: var(--color-text-primary);
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}
.kb-body li { margin-bottom: 0.4rem; }
.kb-body table {
  font-family: var(--font-body);
  font-size: 0.875rem;
  width: 100%;
  margin: 1.5rem 0;
}
.kb-body blockquote.kb-summary { margin: 1.5rem 0; }
.kb-body pre {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  overflow-x: auto;
}
.kb-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--color-bg-light);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}
.kb-body hr.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}
.kb-callout {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-secondary);
  border-radius: 0 6px 6px 0;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--color-text-primary);
}
.kb-callout-icon { font-size: 1.1rem; flex-shrink: 0; }

/* References */
.kb-references {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}
.kb-references h2 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
}
.kb-reference-list {
  font-family: var(--font-body);
  font-size: 0.825rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  padding-left: 1.25rem;
}
.kb-reference-list a {
  color: var(--color-secondary);
  text-decoration: none;
}
.kb-reference-list a:hover { text-decoration: underline; }

/* ─── Article prev/next nav ──────────────────────────────────────────────── */
.kb-article-nav {
  background: var(--color-bg-light);
  padding: 1.25rem 0;
  border-top: 1px solid var(--color-border);
}
.kb-nav-prev, .kb-nav-next, .kb-nav-all {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}
.kb-nav-prev:hover, .kb-nav-next:hover { color: var(--color-secondary); }
.kb-nav-all { color: var(--color-text-muted); font-weight: 400; }

/* ─── Section wrappers (alternating backgrounds) ─────────────────────────── */
.kb-section {
  padding: 1.25rem 0 1.25rem;
  background: var(--color-bg-white);
}
.kb-section--alt {
  background: var(--color-bg-light);
  border-radius: 8px;
  padding: 2rem 1.5rem 1.5rem;
  margin: 0 -1.5rem;
}

/* ─── Horizontal icon card grid (2–4 item bulleted lists) ────────────────── */
.kb-icon-grid {
  margin: 1.25rem 0 1.5rem;
}
.kb-icon-card {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  height: 100%;
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}
.kb-icon-card:hover {
  border-color: var(--color-secondary);
  box-shadow: 0 2px 10px rgba(16,59,73,0.07);
}
.kb-icon-card__icon {
  color: var(--color-secondary);
  flex-shrink: 0;
}

/* Vertical layout: icon above text */
.kb-icon-card--vertical {
  flex-direction: column;
  gap: 0.6rem;
}
.kb-icon-card--vertical .kb-icon-card__icon {
  font-size: 1.5rem;
}

/* Horizontal layout: icon left of text */
.kb-icon-card--horizontal {
  flex-direction: row;
  align-items: flex-start;
  gap: 0.75rem;
}
.kb-icon-card--horizontal .kb-icon-card__icon {
  font-size: 1.1rem;
  margin-top: 0.15rem;
}

.kb-icon-card__body {
  font-family: var(--font-display);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-primary);
}
.kb-icon-card__body strong { color: var(--color-primary); }

/* Cards with no icon (uniqueness couldn't be satisfied) */
.kb-icon-card--no-icon {
  flex-direction: column;
  gap: 0;
}

/* ─── Numbered steps list (visual sequence) ──────────────────────────────── */
.kb-steps-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}
.kb-step {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  position: relative;
  padding-bottom: 1.75rem;
}
.kb-step:last-child { padding-bottom: 0; }
/* Connecting line between circles */
.kb-step:not(:last-child)::before {
  content: '';
  position: absolute;
  left: 1.15rem; /* half of marker width (2.3rem) */
  top: 2.3rem;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-secondary) 0%, rgba(60,120,110,0.15) 100%);
}
.kb-step-marker {
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 50%;
  background: var(--color-secondary);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}
.kb-step-body {
  font-family: var(--font-display);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--color-text-primary);
  padding-top: 0.35rem;
}
.kb-step-body .kb-list-term { font-size: 0.9rem; }

/* ─── Bold-as-header in list items ──────────────────────────────────────── */
.kb-list-term {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--color-primary);
  display: block;
  margin-bottom: 0.05rem;
}
.kb-list-detail {
  font-family: var(--font-display);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  display: block;
}
.kb-icon-card__body .kb-list-term {
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

/* ─── Notion images ──────────────────────────────────────────────────────── */
.kb-figure {
  margin: 1.5rem 0 2rem;
  text-align: center;
}
.kb-figure__img {
  max-width: 100%;
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.10);
}
.kb-figure__caption {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
  font-style: italic;
}

/* ─── Link card (external interactive graphics) ─────────────────────────── */
.kb-link-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  text-decoration: none;
}
.kb-link-card__icon {
  font-size: 1.1rem;
  color: var(--color-secondary);
  flex-shrink: 0;
}
.kb-link-card__text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.kb-link-card__label {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-secondary);
}
.kb-link-card__name {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
}
.kb-link-card__btn {
  flex-shrink: 0;
  background: var(--color-secondary);
  color: #fff;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s ease;
}
.kb-link-card__btn:hover {
  background: var(--color-primary);
  color: #fff;
}

/* ─── Accordion (Notion-marker driven, Bootstrap collapse) ───────────────── */
.kb-accordion {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
  margin: 1.5rem 0 2rem;
}
.kb-accordion-item {
  border-bottom: 1px solid var(--color-border);
}
.kb-accordion-item:last-child { border-bottom: none; }

/* Full clickable trigger: title + preamble + chevron hint at bottom */
/* Single-line default: row layout — title + chevron side by side, compact */
.kb-accordion-trigger {
  display: flex;
  flex-direction: row;
  align-items: center;
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  background: var(--color-bg-light);
  transition: background 0.15s ease;
  user-select: none;
  outline: none;
}
/* Multi-line: switch to column when a preamble block is present */
.kb-accordion-trigger:has(.kb-accordion-preamble) {
  flex-direction: column;
  align-items: stretch;
  padding: 1.1rem 1.5rem 0.85rem;
}
.kb-accordion-trigger:hover,
.kb-accordion-trigger[aria-expanded="true"] {
  background: var(--color-bg-white);
}
.kb-accordion-title {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.925rem;
  color: var(--color-primary);
  line-height: 1.4;
  flex: 1;           /* takes remaining width in row layout */
}
/* Always-visible preamble inside the trigger */
.kb-accordion-preamble {
  font-family: var(--font-display);
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--color-text-primary);
  padding-top: 0.75rem;
  pointer-events: none;
}
.kb-accordion-preamble p { margin-bottom: 0; }
.kb-accordion-preamble h3 {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 0.4rem;
}
/* Expand hint: right-aligned in row mode */
.kb-accordion-expand-hint {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  margin-left: 1rem;
  padding: 0;
}
/* Column mode (preamble present): centered at bottom */
.kb-accordion-trigger:has(.kb-accordion-preamble) .kb-accordion-expand-hint {
  justify-content: center;
  margin-left: 0;
  padding-top: 0.75rem;
  padding-bottom: 0;
}
/* H3-only preamble (no paragraph): compact — header text acts as title */
.kb-accordion-preamble:has(> h3:only-child) {
  padding-top: 0;
}
.kb-accordion-preamble:has(> h3:only-child) h3 {
  margin-bottom: 0;
  font-size: 0.9rem;
}
.kb-accordion-trigger:has(.kb-accordion-preamble > h3:only-child) {
  padding: 0.75rem 1.5rem 0.55rem;
}
.kb-accordion-trigger:has(.kb-accordion-preamble > h3:only-child) .kb-accordion-expand-hint {
  padding-top: 0.35rem;
}
.kb-accordion-chevron {
  display: block;
  width: 20px; height: 20px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='%233C786E' d='M1.5 5.5L8 12l6.5-6.5-1-1L8 10 2.5 4.5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
  transition: transform 0.2s ease;
}
.kb-accordion-trigger[aria-expanded="true"] .kb-accordion-chevron {
  transform: rotate(180deg);
}

.kb-accordion-body {
  padding: 1.25rem 1.5rem 1.5rem;
  background: var(--color-bg-white);
  font-family: var(--font-display);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-text-primary);
  border-top: 1px solid var(--color-border);
}
.kb-accordion-body p  { margin-bottom: 0.75rem; }
.kb-accordion-body ul,
.kb-accordion-body ol { padding-left: 1.5rem; margin-bottom: 0.75rem; }

/* ─── Photo figures (Notion image blocks) ────────────────────────────────── */
.kb-figure--photo {
  border: 1px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
  margin: 2rem 0;
}
.kb-figure--photo .kb-graphic-img,
.kb-figure--png .kb-graphic-img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ─── Article feedback form ──────────────────────────────────────────────── */
.kb-feedback {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--color-border);
}
.kb-feedback-header {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.6rem;
}
.kb-feedback-header .kb-section-icon {
  color: var(--color-text-muted);
  opacity: 0.6;
  font-size: 0.85em;
}
.kb-feedback-form {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-secondary);
  border-radius: 0 8px 8px 0;
  padding: 1.5rem 1.75rem 1.25rem;
  margin-top: 1rem;
}
.kb-feedback-label {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-primary);
  display: block;
  margin-bottom: 0.35rem;
}
/* Compact form-control overrides for KB feedback form */
.kb-feedback-form .form-control {
  font-family: var(--font-display);
  font-size: 0.875rem;
  border: 1.5px solid var(--color-border);
  border-radius: 6px;
  background: #fff;
  color: var(--color-text-primary);
  padding: 0.5rem 0.75rem;
}
.kb-feedback-form .form-control:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(60, 120, 110, 0.12);
}
.kb-feedback-form textarea.form-control {
  font-family: var(--font-display);
  font-size: 0.875rem;
  line-height: 1.7;
  resize: vertical;
}
.kb-feedback-btn {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  color: #fff;
  background: var(--color-secondary);
  border: none;
  border-radius: 6px;
  padding: 0.55rem 1.4rem;
  cursor: pointer;
  transition: background 0.15s ease;
}
.kb-feedback-btn:hover { background: var(--color-primary); }
.kb-feedback-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}
.kb-feedback-privacy {
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin: 0.75rem 0 0;
  line-height: 1.5;
}
.kb-feedback-privacy a {
  color: var(--color-secondary);
  text-decoration: none;
}
.kb-feedback-privacy a:hover { text-decoration: underline; }
.kb-feedback-result {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
}
.kb-feedback-result--success {
  background: rgba(45, 106, 79, 0.1);
  color: #2D6A4F;
  border: 1px solid rgba(45, 106, 79, 0.25);
}
.kb-feedback-result--error {
  background: rgba(181, 69, 27, 0.08);
  color: #B5451B;
  border: 1px solid rgba(181, 69, 27, 0.2);
}

/* ─── @CodingAgent placeholder ──────────────────────────────────────────── */
.kb-agent-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--color-bg-light);
  border: 2px dashed var(--color-secondary);
  border-radius: 10px;
  padding: 2.5rem 1.5rem;
  margin: 2rem 0;
  text-align: center;
}
.kb-agent-icon {
  font-size: 1.5rem;
  color: var(--color-secondary);
  opacity: 0.65;
}
.kb-agent-label {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-text-muted);
}
.kb-agent-desc {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-text-muted);
  max-width: 480px;
  line-height: 1.5;
}
body.kb-staging .kb-agent-desc { display: block; }

/* ─── Standalone graphic pages ───────────────────────────────────────────── */
.kb-standalone-main { padding: 3rem 0 5rem; }
.kb-standalone-body { max-width: 100%; overflow-x: auto; }

/* ─── Responsive ─────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .kb-article-header { padding: 6rem 0 2rem; }
  .kb-hero { padding: 7rem 0 3rem; }
  .kb-figure { padding: 1rem; }
  .kb-nav-all { display: none; }
  .kb-summary { padding: 1.25rem 1.25rem; font-size: 1rem; }
  /* Alt sections, callouts and summary span edge-to-edge on mobile */
  .kb-section--alt,
  .kb-callout,
  .kb-callout-quote,
  .kb-summary {
    margin-left: calc(var(--bs-gutter-x, 1.5rem) * -0.5);
    margin-right: calc(var(--bs-gutter-x, 1.5rem) * -0.5);
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
  .kb-section--alt {
    padding-left: calc(var(--bs-gutter-x, 1.5rem) * 0.5);
    padding-right: calc(var(--bs-gutter-x, 1.5rem) * 0.5);
  }
  .kb-breadcrumb-current { display: none; }
  .kb-breadcrumb-sep { display: none; }
}
@media (max-width: 576px) {
  .kb-icon-grid > [class*="col-"] { flex: 0 0 100%; max-width: 100%; }
}

/* ─── Tick-mark list (Notion to_do blocks) ───────────────────────────────── */
.kb-check-list {
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 1.5rem;
}
.kb-check-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--color-border);
}
.kb-check-item:last-child { border-bottom: none; }
.kb-check-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-secondary);
  color: #fff;
  font-size: 0.6rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.2rem;
}
.kb-check-body {
  flex: 1;
  font-family: var(--font-display);
  font-size: 0.925rem;
  line-height: 1.7;
  color: var(--color-text-primary);
}
/* Bold-as-header: term on its own line, detail below */
.kb-check-body .kb-list-term {
  font-size: 0.925rem;
  margin-bottom: 0.2rem;
}
.kb-check-body .kb-list-detail {
  font-size: 0.875rem;
}

/* ─── Hide embedded inner header on standalone chart page ────────────────── */
.kb-standalone-body .header { display: none; }

/* ─── Image lightbox ─────────────────────────────────────────────────────── */
.kb-figure__img { cursor: zoom-in; }
.kb-lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.88);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  cursor: zoom-out;
}
.kb-lightbox-img {
  max-height: 92vh;
  max-width: none;
  min-width: 0;
  display: block;
  border-radius: 4px;
  box-shadow: 0 8px 48px rgba(0,0,0,0.5);
  cursor: default;
  /* On mobile, allow horizontal scroll for wide images */
  width: auto;
}
@media (max-width: 768px) {
  .kb-lightbox-overlay { align-items: center; justify-content: center; overflow: auto; padding: 1rem; }
  .kb-lightbox-img { max-height: none; height: auto; width: 150vw; max-width: 150vw; min-width: 0; }
}

/* ─── In-text citation tooltips ─────────────────────────────────────────── */
.kb-cite {
  color: var(--ep-secondary, #3C786E);
  text-decoration: underline dotted currentColor;
  text-underline-offset: 3px;
  cursor: pointer;
  border-radius: 2px;
  transition: color 0.15s, background-color 0.15s;
}
.kb-cite:hover,
.kb-cite--active {
  color: var(--ep-primary, #103b49);
  background-color: rgba(60, 120, 110, 0.1);
}
.kb-cite:focus-visible {
  outline: 2px solid var(--ep-secondary, #3C786E);
  outline-offset: 2px;
}

.kb-cite-tooltip {
  position: absolute;
  z-index: 8000;
  background: #fff;
  border-left: 3px solid var(--ep-secondary, #3C786E);
  border-radius: 4px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.14), 0 1px 4px rgba(0, 0, 0, 0.08);
  padding: 0.75rem 1rem;
  font-family: 'Merriweather Sans', sans-serif;
  font-size: 0.8rem;
  line-height: 1.55;
  color: #2d3748;
  pointer-events: auto; /* allow clicking DOI links inside */
  max-width: 400px;
}

.kb-cite-ref {
  margin: 0;
}
.kb-cite-ref + .kb-cite-ref {
  margin-top: 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px solid #e2e8f0;
}

/* DOI links inside tooltip */
.kb-cite-tooltip a {
  color: var(--ep-secondary, #3C786E);
  word-break: break-all;
  font-size: 0.75rem;
}
.kb-cite-tooltip a:hover {
  color: var(--ep-primary, #103b49);
}

@media (max-width: 767px) {
  .kb-cite-tooltip {
    font-size: 0.78rem;
    padding: 0.65rem 0.85rem;
  }
}