/* Quant Knowledge Base — index list view + reader styles. */

/* ---------- Index toolbar ---------- */

.kb-toolbar {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding-bottom: 0.5rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.kb-toolbar-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.kb-toolbar-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  align-items: center;
  justify-content: space-between;
}

.kb-search {
  flex: 1 1 280px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  border-radius: 999px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  min-width: 0;
}

.kb-search svg {
  width: 16px;
  height: 16px;
  color: var(--text-faint);
  flex-shrink: 0;
}

.kb-search input {
  flex: 1;
  border: 0;
  background: transparent;
  outline: 0;
  font-size: 0.92rem;
  color: var(--text);
  min-width: 0;
}

.kb-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  user-select: none;
  cursor: pointer;
  padding: 0.4rem 0.6rem;
  border-radius: 999px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
}

.kb-toggle input {
  margin: 0;
  cursor: pointer;
  accent-color: var(--primary);
}

.kb-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.kb-chip {
  background: var(--surface-alt);
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.32rem 0.78rem;
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: none;
  transition: background 140ms ease, color 140ms ease, border-color 140ms ease;
}

.kb-chip:hover {
  border-color: var(--border-strong);
  color: var(--text);
  transform: none;
  box-shadow: none;
}

.kb-chip.is-active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* ---------- Index list view ---------- */

.kb-category {
  margin-top: 1.1rem;
}

.kb-category-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px dashed var(--border);
}

.kb-category-head h3 {
  margin: 0 0 0.15rem;
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.kb-category-head p {
  margin: 0;
  font-size: 0.88rem;
}

.kb-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

@media (max-width: 720px) {
  .kb-grid {
    grid-template-columns: 1fr;
  }
}

.kb-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: 0.95rem 1rem 1rem;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  transition: transform 140ms ease, box-shadow 140ms ease, border-color 140ms ease;
  min-width: 0;
}

.kb-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: 0 16px 32px rgba(15, 22, 41, 0.08);
}

.kb-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.4rem;
}

.kb-card h4 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.kb-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.45;
}

.kb-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-top: auto;
}

.kb-tag {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
  font-size: 0.72rem;
  color: var(--text-faint);
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
}

.kb-card-cta {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--primary-strong);
  margin-top: 0.1rem;
}

.kb-widget-pill {
  background: var(--ok-soft);
  color: var(--ok);
}

/* ---------- Article reader ---------- */

.kb-article {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.kb-article-head {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--border);
}

.kb-article-eyebrow {
  margin: 0;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
  font-size: 0.78rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.kb-article-head h1 {
  margin: 0;
  font-size: 2.1rem;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.kb-article-summary {
  margin: 0;
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.55;
  max-width: 60rem;
}

.kb-attribution {
  margin: 0.5rem 0 0;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.kb-attribution a {
  color: var(--primary-strong);
}

.kb-warn-banner {
  background: var(--warn-soft);
  color: var(--warn);
  border: 1px solid rgba(182, 95, 13, 0.25);
  border-radius: 10px;
  padding: 0.55rem 0.85rem;
  font-size: 0.88rem;
}

.kb-article-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 2rem;
  align-items: flex-start;
}

@media (max-width: 980px) {
  .kb-article-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .kb-toc {
    position: relative;
    top: 0;
    border-left: 0;
    border-bottom: 1px dashed var(--border);
    padding-bottom: 0.8rem;
  }
}

.kb-toc {
  position: sticky;
  top: 1rem;
  align-self: flex-start;
  padding-left: 0.85rem;
  border-left: 2px solid var(--border);
}

.kb-toc-label {
  margin: 0 0 0.55rem;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.kb-toc nav {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.88rem;
  line-height: 1.4;
}

.kb-toc nav a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 120ms ease;
}

.kb-toc nav a:hover {
  color: var(--primary-strong);
}

.kb-toc-h3 {
  padding-left: 0.85rem;
  font-size: 0.84rem;
}

/* ---------- Prose typography ---------- */

.kb-article-prose {
  max-width: 72ch;
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--text);
}

.kb-article-prose h1,
.kb-article-prose h2,
.kb-article-prose h3,
.kb-article-prose h4 {
  margin: 2.4rem 0 0.6rem;
  letter-spacing: -0.02em;
  scroll-margin-top: 1rem;
}

.kb-article-prose h1 { font-size: 1.85rem; line-height: 1.2; }
.kb-article-prose h2 { font-size: 1.5rem; line-height: 1.25; }
.kb-article-prose h3 { font-size: 1.18rem; line-height: 1.3; }
.kb-article-prose h4 { font-size: 1.02rem; line-height: 1.35; color: var(--text-muted); }

.kb-article-prose h2 {
  padding-top: 0.4rem;
  border-top: 1px solid var(--border);
}

.kb-article-prose p {
  margin: 0 0 1.05rem;
}

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

.kb-article-prose a:hover {
  text-decoration-thickness: 2px;
}

.kb-article-prose strong { font-weight: 700; }
.kb-article-prose em { font-style: italic; }

.kb-article-prose ul,
.kb-article-prose ol {
  margin: 0 0 1.05rem;
  padding-left: 1.4rem;
}

.kb-article-prose li {
  margin: 0.3rem 0;
}

.kb-article-prose blockquote {
  margin: 1.1rem 0;
  padding: 0.7rem 1rem;
  border-left: 3px solid var(--primary);
  background: var(--primary-soft);
  border-radius: 0 10px 10px 0;
  color: var(--text);
  font-style: italic;
}

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

.kb-article-prose code {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
  font-size: 0.92em;
  padding: 0.12em 0.38em;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 5px;
}

.kb-article-prose pre {
  margin: 1.2rem 0;
  padding: 0;
  background: #0d1117;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid #232c3a;
}

.kb-article-prose pre code {
  display: block;
  padding: 1rem 1.1rem;
  background: transparent;
  border: 0;
  border-radius: 0;
  color: #e6edf3;
  font-size: 0.88rem;
  line-height: 1.55;
  overflow-x: auto;
  white-space: pre;
}

.kb-article-prose hr {
  border: 0;
  border-top: 1px dashed var(--border);
  margin: 2rem 0;
}

.kb-article-prose img {
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--border);
  margin: 0.6rem 0;
}

.kb-article-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.2rem 0;
  font-size: 0.92rem;
}

.kb-article-prose th,
.kb-article-prose td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.7rem;
  text-align: left;
}

.kb-article-prose th {
  background: var(--surface-alt);
  font-weight: 600;
}

/* KaTeX overrides */
.kb-article-prose .katex-display {
  margin: 1.2rem 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.4rem 0;
}

.kb-mermaid {
  margin: 1.4rem 0;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  overflow-x: auto;
  text-align: center;
}

.kb-mermaid svg {
  max-width: 100%;
  height: auto;
}

.kb-article-foot {
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

/* ---------- Widget surfaces ---------- */

.kb-widget {
  margin: 1.6rem 0;
  padding: 1.1rem 1.15rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(40, 86, 245, 0.04), rgba(42, 212, 163, 0.02));
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.kb-widget-head h4 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
  letter-spacing: -0.01em;
  border-top: 0;
  padding-top: 0;
}

.kb-widget-head p {
  margin: 0;
}

.kb-widget-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.7rem 0.9rem;
  align-items: end;
}

.kb-slider {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.86rem;
}

.kb-slider-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
}

.kb-slider-label {
  color: var(--text-muted);
  font-weight: 500;
}

.kb-slider-value {
  font-size: 0.84rem;
  color: var(--text);
  font-weight: 600;
}

.kb-slider input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--border-strong);
  border-radius: 999px;
  outline: 0;
  cursor: pointer;
  accent-color: var(--primary);
}

.kb-slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--primary);
  border-radius: 50%;
  border: 2px solid white;
  box-shadow: 0 2px 6px rgba(40, 94, 255, 0.4);
  cursor: pointer;
}

.kb-slider input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--primary);
  border-radius: 50%;
  border: 2px solid white;
  cursor: pointer;
}

.kb-toggle-group {
  display: inline-flex;
  border-radius: 999px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  padding: 0.18rem;
  gap: 0.15rem;
  align-self: end;
  width: fit-content;
}

.kb-pill-btn {
  background: transparent;
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.38rem 0.85rem;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  border: 0;
  box-shadow: none;
  transform: none;
}

.kb-pill-btn:hover {
  background: rgba(40, 86, 245, 0.06);
  color: var(--text);
  transform: none;
  box-shadow: none;
}

.kb-pill-btn.is-active {
  background: var(--primary);
  color: white;
}

.kb-reseed {
  align-self: end;
  padding: 0.45rem 0.95rem;
  font-size: 0.86rem;
  background: rgba(255, 255, 255, 0);
  color: var(--primary-strong);
  box-shadow: inset 0 0 0 1px var(--border-strong);
}

.kb-reseed:hover {
  background: var(--primary-soft);
  color: var(--primary-strong);
  box-shadow: inset 0 0 0 1px var(--primary);
}

.kb-widget-outputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.5rem;
}

.kb-stat {
  display: flex;
  flex-direction: column;
  gap: 0.18rem;
  padding: 0.55rem 0.75rem;
  border-radius: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  min-width: 0;
}

.kb-stat-label {
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 600;
}

.kb-stat-value {
  font-size: 1rem;
  color: var(--text);
  font-weight: 700;
}

.kb-widget-chart {
  position: relative;
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.5rem;
}

.kb-canvas {
  width: 100%;
  height: 320px;
  display: block;
}

@media (max-width: 720px) {
  .kb-canvas {
    height: 260px;
  }
}