/* TetraKits Investing Dictionary — #4628FC accent */
:root {
  --inv-accent: #4628FC;
  --inv-accent-hover: #3a1fe0;
  --inv-accent-soft: rgba(70, 40, 252, 0.08);
  --inv-accent-muted: rgba(70, 40, 252, 0.14);
  --inv-bg: #fafafa;
  --inv-surface: #ffffff;
  --inv-border: #e4e4e7;
  --inv-text: #18181b;
  --inv-muted: #71717a;
  --inv-sidebar-w: 260px;
}

.inv-body {
  background: var(--inv-bg);
}

.inv-layout {
  display: grid;
  grid-template-columns: var(--inv-sidebar-w) 1fr;
  min-height: calc(100vh - 64px);
  max-width: 1280px;
  margin: 0 auto;
}

.inv-layout__menu {
  display: none;
  align-items: center;
  gap: 0.5rem;
  margin: 1rem 1.25rem 0;
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--inv-border);
  border-radius: 8px;
  background: var(--inv-surface);
  font: 600 0.875rem/1 Inter, system-ui, sans-serif;
  color: var(--inv-text);
  cursor: pointer;
}

.inv-sidebar {
  position: sticky;
  top: 64px;
  align-self: start;
  height: calc(100vh - 64px);
  overflow-y: auto;
  border-right: 1px solid var(--inv-border);
  background: var(--inv-surface);
  padding: 1rem 0 2rem;
}

.inv-sidebar__head {
  padding: 0 1rem 0.75rem;
}

.inv-sidebar__search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--inv-border);
  border-radius: 8px;
  background: var(--inv-bg);
  color: var(--inv-muted);
}

.inv-sidebar__search input {
  flex: 1;
  border: 0;
  background: transparent;
  font: 500 0.875rem/1.4 Inter, system-ui, sans-serif;
  color: var(--inv-text);
  outline: none;
  min-width: 0;
}

.inv-sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 0 0.5rem;
}

.inv-sidebar__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  font: 500 0.875rem/1.35 Inter, system-ui, sans-serif;
  color: var(--inv-muted);
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}

.inv-sidebar__link:hover {
  background: var(--inv-accent-soft);
  color: var(--inv-text);
}

.inv-sidebar__link--active {
  background: var(--inv-accent-muted);
  color: var(--inv-accent);
  font-weight: 600;
}

.inv-sidebar__count {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--inv-muted);
  background: var(--inv-bg);
  padding: 0.125rem 0.4375rem;
  border-radius: 999px;
}

.inv-main {
  padding: 2rem 2.5rem 4rem;
  min-width: 0;
}

.inv-hero {
  margin-bottom: 2.5rem;
}

.inv-hero__eyebrow {
  font: 700 0.75rem/1 Inter, system-ui, sans-serif;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--inv-accent);
  margin: 0 0 0.75rem;
}

.inv-hero h1 {
  font: 800 clamp(1.75rem, 4vw, 2.5rem)/1.15 Inter, system-ui, sans-serif;
  letter-spacing: -0.03em;
  color: var(--inv-text);
  margin: 0 0 1rem;
  max-width: 42rem;
}

.inv-hero > p {
  font: 500 1.0625rem/1.6 Inter, system-ui, sans-serif;
  color: var(--inv-muted);
  margin: 0 0 1.5rem;
  max-width: 38rem;
}

.inv-hero__search {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  max-width: 32rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--inv-border);
  border-radius: 12px;
  background: var(--inv-surface);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
  color: var(--inv-muted);
}

.inv-hero__search input {
  flex: 1;
  border: 0;
  background: transparent;
  font: 500 1rem/1.4 Inter, system-ui, sans-serif;
  color: var(--inv-text);
  outline: none;
}

.inv-section-heading {
  font: 700 1.25rem/1.3 Inter, system-ui, sans-serif;
  color: var(--inv-text);
  margin: 0 0 1.25rem;
}

.inv-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0 0 3rem;
}

.inv-hub-card {
  display: block;
  padding: 1.25rem;
  border: 1px solid var(--inv-border);
  border-radius: 12px;
  background: var(--inv-surface);
  text-decoration: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.inv-hub-card:hover {
  border-color: var(--inv-accent);
  box-shadow: 0 4px 20px rgba(70, 40, 252, 0.1);
}

.inv-hub-card h2 {
  font: 700 1rem/1.3 Inter, system-ui, sans-serif;
  color: var(--inv-text);
  margin: 0 0 0.5rem;
}

.inv-hub-card p {
  font: 400 0.875rem/1.5 Inter, system-ui, sans-serif;
  color: var(--inv-muted);
  margin: 0 0 0.75rem;
}

.inv-hub-card__meta {
  font: 600 0.75rem/1 Inter, system-ui, sans-serif;
  color: var(--inv-accent);
}

.inv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  list-style: none;
  padding: 0;
  margin: 0 0 2.5rem;
}

.inv-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--inv-border);
  border-radius: 12px;
  background: var(--inv-surface);
  overflow: hidden;
  text-decoration: none;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}

.inv-card:hover {
  border-color: var(--inv-accent);
  box-shadow: 0 8px 24px rgba(70, 40, 252, 0.12);
  transform: translateY(-2px);
}

.inv-card__media {
  margin: 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--inv-bg);
}

.inv-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.inv-card__body {
  padding: 1rem 1.125rem 1.125rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  flex: 1;
}

.inv-card__tag {
  font: 700 0.6875rem/1 Inter, system-ui, sans-serif;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--inv-accent);
}

.inv-card__title {
  font: 700 1rem/1.35 Inter, system-ui, sans-serif;
  color: var(--inv-text);
  margin: 0;
}

.inv-card__excerpt {
  font: 400 0.8125rem/1.5 Inter, system-ui, sans-serif;
  color: var(--inv-muted);
  margin: 0;
  flex: 1;
}

.inv-card__cta {
  font: 600 0.8125rem/1 Inter, system-ui, sans-serif;
  color: var(--inv-accent);
  margin-top: 0.25rem;
}

.inv-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  font: 500 0.8125rem/1.4 Inter, system-ui, sans-serif;
  color: var(--inv-muted);
  margin-bottom: 1.25rem;
}

.inv-breadcrumb a {
  color: var(--inv-accent);
  text-decoration: none;
}

.inv-breadcrumb a:hover {
  text-decoration: underline;
}

.inv-hub-header {
  margin-bottom: 2rem;
}

.inv-hub-header h1 {
  font: 800 2rem/1.2 Inter, system-ui, sans-serif;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

.inv-hub-header__desc {
  font: 500 1.0625rem/1.6 Inter, system-ui, sans-serif;
  color: var(--inv-muted);
  margin: 0;
  max-width: 40rem;
}

.inv-article__header {
  margin-bottom: 1.5rem;
}

.inv-article__tag {
  display: inline-block;
  font: 700 0.6875rem/1 Inter, system-ui, sans-serif;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  background: var(--inv-accent);
  padding: 0.3125rem 0.625rem;
  border-radius: 999px;
  margin-bottom: 0.75rem;
}

.inv-article__header h1 {
  font: 800 clamp(1.75rem, 4vw, 2.375rem)/1.15 Inter, system-ui, sans-serif;
  letter-spacing: -0.03em;
  margin: 0 0 0.75rem;
}

.inv-article__lead {
  font: 500 1.0625rem/1.6 Inter, system-ui, sans-serif;
  color: var(--inv-muted);
  margin: 0;
  max-width: 42rem;
}

.inv-article__hero {
  margin: 0 0 1.75rem;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--inv-border);
}

.inv-article__hero img {
  display: block;
  width: 100%;
  height: auto;
}

.inv-toc {
  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  border: 1px solid var(--inv-border);
  border-radius: 12px;
  background: var(--inv-surface);
}

.inv-toc__title {
  font: 700 0.8125rem/1 Inter, system-ui, sans-serif;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--inv-muted);
  margin: 0 0 0.75rem;
}

.inv-toc ol {
  margin: 0;
  padding-left: 1.25rem;
  font: 500 0.9375rem/1.8 Inter, system-ui, sans-serif;
}

.inv-toc a {
  color: var(--inv-accent);
  text-decoration: none;
}

.inv-toc a:hover {
  text-decoration: underline;
}

.inv-section {
  margin-bottom: 2rem;
}

.inv-section h2 {
  font: 700 1.375rem/1.3 Inter, system-ui, sans-serif;
  color: var(--inv-text);
  margin: 0 0 0.875rem;
}

.inv-section h3 {
  font: 600 1rem/1.3 Inter, system-ui, sans-serif;
  margin: 0 0 0.5rem;
}

.inv-section p,
.inv-section li {
  font: 400 1rem/1.65 Inter, system-ui, sans-serif;
  color: #3f3f46;
}

.inv-section ul {
  margin: 0;
  padding-left: 1.25rem;
}

.inv-section li + li {
  margin-top: 0.375rem;
}

.inv-formula {
  font: 600 1.125rem/1.5 Inter, system-ui, sans-serif;
  color: var(--inv-accent);
  padding: 1rem 1.25rem;
  background: var(--inv-accent-soft);
  border-radius: 8px;
  border-left: 4px solid var(--inv-accent);
}

.inv-article__hero + .tool-ad-banner,
.inv-article__header + .tool-ad-banner {
  margin: 0 0 1.25rem;
}

.inv-summary + .tool-ad-banner {
  margin: 0 0 1.25rem;
}

  padding: 1.25rem 1.5rem;
  margin-bottom: 2rem;
  border-radius: 12px;
  background: var(--inv-accent-soft);
  border-left: 4px solid var(--inv-accent);
}

.inv-summary__label {
  font: 700 0.8125rem/1 Inter, system-ui, sans-serif;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--inv-accent);
  margin: 0 0 0.625rem;
}

.inv-summary ul {
  margin: 0;
  padding-left: 1.25rem;
}

.inv-summary li {
  font: 500 0.9375rem/1.55 Inter, system-ui, sans-serif;
  color: var(--inv-text);
}

.inv-summary li + li {
  margin-top: 0.375rem;
}

.inv-prose {
  max-width: 42rem;
  font: 400 1.0625rem/1.75 Inter, system-ui, sans-serif;
  color: #3f3f46;
}

.inv-prose > p:first-child {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--inv-text);
}

.inv-prose h2 {
  font: 700 1.375rem/1.3 Inter, system-ui, sans-serif;
  color: var(--inv-text);
  margin: 2.25rem 0 0.875rem;
  letter-spacing: -0.02em;
}

.inv-prose h3 {
  font: 600 1.125rem/1.35 Inter, system-ui, sans-serif;
  color: var(--inv-text);
  margin: 1.5rem 0 0.625rem;
}

.inv-prose p {
  margin: 0 0 1.125rem;
}

.inv-prose ul,
.inv-prose ol {
  margin: 0 0 1.25rem;
  padding-left: 1.375rem;
}

.inv-prose li {
  margin-bottom: 0.375rem;
}

.inv-prose a {
  color: var(--inv-accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.inv-chart {
  margin: 1.75rem 0 2rem;
  text-align: center;
}

.inv-chart img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--inv-border);
  background: var(--inv-surface);
}

.inv-chart figcaption {
  margin-top: 0.625rem;
  font: 500 0.8125rem/1.4 Inter, system-ui, sans-serif;
  color: var(--inv-muted);
}

.inv-faq-section {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--inv-border);
}

.inv-faq-section h2 {
  font: 700 1.375rem/1.3 Inter, system-ui, sans-serif;
  margin: 0 0 1rem;
}

.inv-related h2 {
  font: 700 1.375rem/1.3 Inter, system-ui, sans-serif;
  margin: 0 0 1.25rem;
}

.inv-pros-cons__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.inv-faq__item {
  border: 1px solid var(--inv-border);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  background: var(--inv-surface);
}

.inv-faq__item summary {
  padding: 0.875rem 1rem;
  font: 600 0.9375rem/1.4 Inter, system-ui, sans-serif;
  cursor: pointer;
  list-style: none;
}

.inv-faq__item summary::-webkit-details-marker {
  display: none;
}

.inv-faq__item p {
  padding: 0 1rem 1rem;
  margin: 0;
  font: 400 0.9375rem/1.6 Inter, system-ui, sans-serif;
  color: var(--inv-muted);
}

.inv-search-results {
  position: absolute;
  z-index: 50;
  left: 0;
  right: 0;
  top: calc(100% + 4px);
  max-height: 320px;
  overflow-y: auto;
  background: var(--inv-surface);
  border: 1px solid var(--inv-border);
  border-radius: 12px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
  list-style: none;
  margin: 0;
  padding: 0.375rem;
}

.inv-search-results a {
  display: block;
  padding: 0.625rem 0.75rem;
  border-radius: 8px;
  text-decoration: none;
  font: 500 0.875rem/1.4 Inter, system-ui, sans-serif;
  color: var(--inv-text);
}

.inv-search-results a:hover,
.inv-search-results a:focus {
  background: var(--inv-accent-soft);
}

.inv-search-results small {
  display: block;
  font-size: 0.75rem;
  color: var(--inv-muted);
  margin-top: 0.125rem;
}

.inv-search-wrap {
  position: relative;
}

.inv-card.is-hidden,
.inv-hub-card.is-hidden {
  display: none !important;
}

@media (max-width: 900px) {
  .inv-layout {
    grid-template-columns: 1fr;
  }

  .inv-layout__menu {
    display: inline-flex;
  }

  .inv-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 200;
    width: min(300px, 88vw);
    height: 100dvh;
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    box-shadow: 8px 0 32px rgba(0, 0, 0, 0.12);
  }

  .inv-sidebar.is-open {
    transform: translateX(0);
  }

  .inv-main {
    padding: 1rem 1.25rem 3rem;
  }

  .inv-pros-cons__grid {
    grid-template-columns: 1fr;
  }
}