:root {
  --bg: #0f141b;
  --panel: #151b24;
  --panel-2: #1b2430;
  --line: #2b3543;
  --text: #e7edf5;
  --muted: #98a6b8;
  --soft: #c4cfdd;
  --blue: #6aa8ff;
  --green: #7bd88f;
  --amber: #f6c768;
  --purple: #b69cff;
  --shadow: 0 20px 60px rgba(0,0,0,.28);
  --radius: 18px;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, rgba(57, 90, 136, .18), transparent 34rem), var(--bg);
  color: var(--text);
}
a { color: inherit; text-decoration: none; }
.kb-topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: rgba(15, 20, 27, .86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}
.kb-brand { display: flex; align-items: center; gap: .75rem; }
.kb-brand-mark {
  display: grid;
  place-items: center;
  width: 2.35rem;
  height: 2.35rem;
  border-radius: 12px;
  background: linear-gradient(145deg, #233144, #111820);
  border: 1px solid #344256;
  color: var(--blue);
  font-weight: 800;
}
.kb-brand strong, .kb-brand small { display: block; }
.kb-brand small { color: var(--muted); font-size: .78rem; margin-top: .1rem; }
.kb-topnav { display: flex; gap: .5rem; flex-wrap: wrap; justify-content: flex-end; }
.kb-topnav a {
  color: var(--soft);
  padding: .55rem .75rem;
  border-radius: 999px;
  border: 1px solid transparent;
}
.kb-topnav a:hover { border-color: var(--line); background: rgba(255,255,255,.04); }
.kb-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: calc(100vh - 70px);
}
.kb-sidebar {
  position: sticky;
  top: 70px;
  height: calc(100vh - 70px);
  overflow: auto;
  padding: 1.25rem;
  border-right: 1px solid var(--line);
  background: rgba(16, 22, 30, .55);
}
.kb-search-wrap, .kb-filter-wrap { margin-bottom: 1rem; }
label { display: block; color: var(--muted); font-size: .78rem; margin-bottom: .4rem; }
input, select {
  width: 100%;
  background: #111821;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: .7rem .8rem;
  outline: none;
}
input:focus, select:focus { border-color: rgba(106,168,255,.8); box-shadow: 0 0 0 3px rgba(106,168,255,.14); }
.kb-category-nav { display: grid; gap: .35rem; }
.kb-category-nav a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .7rem .75rem;
  border-radius: 12px;
  color: var(--soft);
  border: 1px solid transparent;
}
.kb-category-nav a:hover, .kb-category-nav a.active { background: rgba(255,255,255,.045); border-color: var(--line); }
.kb-category-nav small { color: var(--muted); }
.kb-content-shell { padding: 2rem; }
.kb-app { max-width: 1120px; margin: 0 auto; }
.kb-hero, .kb-section-header, .article-header {
  background: linear-gradient(180deg, rgba(27,36,48,.94), rgba(21,27,36,.94));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.4rem, 4vw, 3rem);
  box-shadow: var(--shadow);
}
.eyebrow { color: var(--blue); font-weight: 700; font-size: .8rem; letter-spacing: .05em; text-transform: uppercase; }
h1 { font-size: clamp(2rem, 5vw, 4.2rem); line-height: 1.02; margin: .65rem 0 1rem; }
p { color: var(--soft); line-height: 1.65; }
.hero-actions { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1.5rem; }
.primary-action, .secondary-action {
  padding: .78rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--line);
  font-weight: 700;
}
.primary-action { background: var(--blue); color: #08101a; border-color: transparent; }
.secondary-action { background: rgba(255,255,255,.04); color: var(--text); }
.kb-principles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: 1rem 0; }
.kb-principles article, .article-card, .tier-grid article {
  background: rgba(21,27,36,.86);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
}
.kb-principles strong, .kb-principles span { display: block; }
.kb-principles span { color: var(--muted); margin-top: .4rem; line-height: 1.5; }
.article-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 1rem; margin-top: 1rem; }
.article-card { transition: transform .16s ease, border-color .16s ease, background .16s ease; }
.article-card:hover { transform: translateY(-2px); border-color: rgba(106,168,255,.55); background: rgba(28, 38, 51, .95); }
.article-card-top, .article-meta-row { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; color: var(--muted); font-size: .8rem; }
.article-card h2 { font-size: 1.08rem; margin: .9rem 0 .45rem; }
.article-card p, .article-card small { color: var(--muted); line-height: 1.5; }
.plan-badge {
  display: inline-flex;
  align-items: center;
  padding: .22rem .5rem;
  border-radius: 999px;
  font-size: .72rem;
  font-weight: 800;
  border: 1px solid currentColor;
}
.plan-free { color: #b8c4d3; background: rgba(184,196,211,.08); }
.plan-creator { color: var(--blue); background: rgba(106,168,255,.10); }
.plan-production { color: var(--green); background: rgba(123,216,143,.10); }
.plan-operations { color: var(--amber); background: rgba(246,199,104,.11); }
.plan-enterprise { color: var(--purple); background: rgba(182,156,255,.11); }
.kb-article { max-width: 900px; margin: 0 auto; }
.back-link { display: inline-flex; color: var(--blue); margin-bottom: 1rem; }
.article-header h1 { font-size: clamp(2rem, 4vw, 3.4rem); }
.maturity-note {
  margin-top: 1rem;
  padding: .8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--soft);
  background: rgba(255,255,255,.035);
}
.article-body { display: grid; gap: 1rem; margin-top: 1rem; }
.lead-copy { font-size: 1.1rem; }
.screenshot-block, .steps-block, .note-block, .callout-block, .related-block {
  margin: 0;
  background: rgba(21,27,36,.86);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
}
.screenshot-block img {
  width: 100%;
  display: block;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: #0d1218;
}
.screenshot-block figcaption { margin-top: .85rem; color: var(--soft); }
.screenshot-block ol, .steps-block ol { color: var(--soft); line-height: 1.7; }
.steps-block h2, .related-block h2 { margin-top: 0; }
.note-block.tip { border-color: rgba(123,216,143,.4); }
.note-block.warning { border-color: rgba(246,199,104,.5); }
.callout-block { display: grid; gap: .4rem; border-color: rgba(106,168,255,.35); }
.callout-block span { color: var(--soft); line-height: 1.6; }
.tier-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: .75rem; }
.tier-grid h3 { margin: .8rem 0 .3rem; }
.tier-grid p { font-size: .88rem; }
.related-list { display: grid; gap: .5rem; }
.related-list a {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: .75rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--soft);
}
.empty-state { padding: 2rem; border: 1px dashed var(--line); border-radius: var(--radius); color: var(--muted); }
.empty-state strong, .empty-state span { display: block; }
@media (max-width: 940px) {
  .kb-layout { grid-template-columns: 1fr; }
  .kb-sidebar { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .article-grid, .kb-principles, .tier-grid { grid-template-columns: 1fr; }
  .kb-topbar { align-items: flex-start; flex-direction: column; }
  .kb-content-shell { padding: 1rem; }
}