:root {
  /* LangChain brand */
  --langchain-green: #00a67e;
  --langchain-green-dark: #007f60;
  --langchain-green-light: #2dd4a7;

  /* Graph / agent flow accents (LangGraph style) */
  --langgraph-cyan: #22d3ee;
  --langgraph-cyan-soft: rgba(34, 211, 238, 0.15);

  /* Dark surfaces (Tailwind slate-inspired) */
  --surface-strong: #0f172a;
  --surface-soft: #1e293b;

  /* Text */
  --text-strong: #e2e8f0;
  --text-soft: rgba(226, 232, 240, 0.72);

  /* Focus / ring */
  --ring: rgba(0, 166, 126, 0.35);

  /* Mermaid diagrams */
  --mermaid-node-bg: #122630;
  --mermaid-node-border: #00a67e;
  --mermaid-edge: #22d3ee;
  --mermaid-cluster-bg: #17243c;

  /* Material for MkDocs (docs theme) */
  --md-primary-fg-color: #00a67e;
  --md-primary-fg-color--light: #2dd4a7;
  --md-primary-fg-color--dark: #007f60;

  --md-accent-fg-color: #22d3ee;
  --md-accent-fg-color--transparent: rgba(34, 211, 238, 0.12);

  --md-default-bg-color: #0b1020;
  --md-default-fg-color: rgba(226, 232, 240, 0.92);
  --md-default-fg-color--light: rgba(226, 232, 240, 0.72);
  --md-default-fg-color--lighter: rgba(226, 232, 240, 0.48);
}

html,
body {
  color-scheme: dark;
}

.md-main {
  position: relative;
}

.md-main::before,
.md-main::after {
  content: "";
  pointer-events: none;
  position: fixed;
  z-index: -1;
  border-radius: 999px;
  filter: blur(56px);
  opacity: 0.45;
}

.md-main::before {
  width: 360px;
  height: 360px;
  top: 8vh;
  right: -120px;
  background: radial-gradient(circle, var(--brand-3), transparent 62%);
}

.md-main::after {
  width: 420px;
  height: 420px;
  bottom: -120px;
  left: -140px;
  background: radial-gradient(circle, var(--brand-2), transparent 62%);
}

.hero-shell {
  position: relative;
  overflow: hidden;
  margin: 0 0 1.6rem;
  padding: clamp(1.5rem, 3.3vw, 3rem);
  border-radius: 1.3rem;
  border: 1px solid var(--ring);
  background: linear-gradient(130deg, rgba(0, 166, 126, 0.22), rgba(34, 211, 238, 0.18) 52%, rgba(79, 70, 229, 0.18));
  box-shadow: 0 16px 44px rgba(2, 8, 23, 0.18);
}

.hero-shell::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(34, 211, 238, 0.10), transparent 40%, rgba(0, 166, 126, 0.08));
  pointer-events: none;
}

.hero-kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--brand-1);
}

.hero-shell h1 {
  margin: 0.35rem 0 0.7rem;
  max-width: 16ch;
  font-size: clamp(1.8rem, 4.2vw, 3.25rem);
  line-height: 1.07;
  color: var(--text-strong);
}

.hero-lead {
  margin: 0;
  max-width: 64ch;
  color: color-mix(in srgb, var(--text-strong) 84%, transparent);
  font-size: 1.02rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.25rem;
}

.hero-actions .md-button {
  border-radius: 999px;
}

.hero-banner {
  width: 100%;
  border-radius: 1.1rem;
  margin: 0 0 1.4rem;
  border: 1px solid var(--ring);
  box-shadow: 0 16px 28px rgba(2, 8, 23, 0.16);
}

.stats-strip {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0 0 2rem;
}

.stat-card {
  padding: 1rem;
  border-radius: 1rem;
  border: 1px solid var(--ring);
  background: var(--surface-soft);
  backdrop-filter: blur(8px);
}

.stat-value {
  margin: 0;
  font-size: 1.7rem;
  font-weight: 800;
  line-height: 1;
  color: var(--brand-1);
}

.stat-label {
  margin: 0.35rem 0 0;
  font-size: 0.88rem;
  color: color-mix(in srgb, var(--text-strong) 74%, transparent);
}

.feature-grid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 2rem;
}

.feature-card {
  padding: 1.05rem 1.05rem 1.1rem;
  border: 1px solid var(--ring);
  border-radius: 1rem;
  background: var(--surface-strong);
  box-shadow: 0 8px 26px rgba(2, 8, 23, 0.08);
}

.feature-card h3 {
  margin: 0;
  font-size: 1.02rem;
}

.feature-card p {
  margin: 0.5rem 0 0;
  font-size: 0.93rem;
}

.resource-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-bottom: 2rem;
}

.resource-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-radius: 1rem;
  text-decoration: none;
  border: 1px solid var(--ring);
  background: var(--surface-strong);
  box-shadow: 0 10px 24px rgba(2, 8, 23, 0.12);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.resource-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(2, 8, 23, 0.18);
  border-color: color-mix(in srgb, var(--brand-2) 45%, transparent);
}

.resource-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.resource-copy {
  padding: 0.9rem 1rem 1rem;
}

.resource-copy h3 {
  margin: 0;
  font-size: 1rem;
}

.resource-copy p {
  margin: 0.45rem 0 0;
  font-size: 0.88rem;
  color: color-mix(in srgb, var(--text-strong) 76%, transparent);
}

.qa-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 0.9rem 0 1.8rem;
}

.qa-card {
  display: block;
  padding: 0.88rem 0.92rem;
  text-decoration: none;
  border-radius: 0.95rem;
  border: 1px solid var(--ring);
  background: var(--surface-strong);
  transition: transform 140ms ease, box-shadow 140ms ease;
}

.qa-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 18px rgba(2, 8, 23, 0.1);
}

.qa-id {
  display: inline-flex;
  width: 2rem;
  height: 2rem;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: color-mix(in srgb, var(--brand-2) 22%, transparent);
  font-weight: 700;
  font-size: 0.78rem;
}

.qa-card h3 {
  margin: 0.62rem 0 0;
  font-size: 1rem;
}

.qa-card p {
  margin: 0.36rem 0 0;
  font-size: 0.82rem;
  color: color-mix(in srgb, var(--text-strong) 75%, transparent);
}

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

.md-sidebar--primary .md-nav__item--nested {
  margin: 0.08rem 0;
}

.md-sidebar--primary .md-nav__item > .md-nav__link {
  border-radius: 0.68rem;
  margin: 0.05rem 0;
  padding: 0.26rem 0.58rem;
  transition: background-color 140ms ease, color 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.md-sidebar--primary .md-nav__item > .md-nav__link:hover {
  background: color-mix(in srgb, var(--brand-2) 14%, transparent);
  color: color-mix(in srgb, var(--brand-2) 54%, var(--text-strong));
}

.md-sidebar--primary .md-nav__item--nested > .md-nav__link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 1.86rem;
  padding: 0.28rem 0.62rem 0.28rem 0.66rem;
  line-height: 1.22;
  border-radius: 0.72rem;
  cursor: pointer;
  border: 1px solid color-mix(in srgb, var(--brand-2) 18%, transparent);
  background: color-mix(in srgb, var(--brand-2) 5%, transparent);
}

.md-sidebar--primary .md-nav__item--nested > .md-nav__link:hover {
  background: color-mix(in srgb, var(--brand-2) 18%, transparent);
  border-color: color-mix(in srgb, var(--brand-2) 44%, transparent);
}

.md-sidebar--primary .md-nav__item--active > .md-nav__link,
.md-sidebar--primary .md-nav__item > .md-nav__link--active {
  color: var(--brand-1);
  font-weight: 700;
  background: color-mix(in srgb, var(--brand-2) 12%, transparent);
}

.md-sidebar--primary .md-nav__item--nested > .md-nav__link .md-nav__icon {
  margin-left: auto;
  color: color-mix(in srgb, var(--brand-1) 66%, var(--text-strong));
  transition: transform 160ms ease, color 160ms ease;
}

.md-sidebar--primary .md-nav__item--nested > input.md-nav__toggle:checked + .md-nav__link {
  background: color-mix(in srgb, var(--brand-2) 20%, transparent);
  border-color: color-mix(in srgb, var(--brand-2) 48%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--brand-1) 28%, transparent);
}

.md-sidebar--primary .md-nav__item--nested > input.md-nav__toggle:checked + .md-nav__link .md-nav__icon {
  color: var(--brand-2);
  transform: rotate(180deg);
}

.md-sidebar--primary .md-nav[data-md-level]:not([data-md-level="1"]) {
  margin-left: 0;
  padding-left: 0.28rem;
}

.md-sidebar--primary .md-nav__item--nested > input.md-nav__toggle:checked ~ .md-nav {
  margin-top: 0.14rem;
  margin-left: 0;
  padding-left: 0.28rem;
  border-left: 1px solid color-mix(in srgb, var(--brand-2) 24%, transparent);
}

.md-sidebar--primary .md-nav__link:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--brand-2) 62%, transparent);
  outline-offset: 1px;
}

.mermaid {
  margin: 1rem 0 1.4rem;
  padding: 0.9rem;
  border-radius: 0.95rem;
  border: 1px solid var(--ring);
  background: var(--surface-strong);
  overflow-x: auto;
  text-align: center;
}

.mermaid svg {
  display: block;
  margin: 0 auto;
  max-width: 100%;
  height: auto;
}

.mermaid .node rect,
.mermaid .node circle,
.mermaid .node polygon,
.mermaid .node path {
  fill: var(--mermaid-node-bg) !important;
  stroke: var(--mermaid-node-border) !important;
}

.mermaid .edgePath .path,
.mermaid .flowchart-link {
  stroke: var(--mermaid-edge) !important;
}

.mermaid marker path {
  stroke: var(--mermaid-edge) !important;
  fill: var(--mermaid-edge) !important;
}

.mermaid .cluster rect {
  fill: var(--mermaid-cluster-bg) !important;
  stroke: var(--mermaid-node-border) !important;
}

.mermaid .label,
.mermaid text {
  fill: var(--text-strong) !important;
}

pre code.language-mermaid {
  white-space: pre;
}

@media (max-width: 1080px) {
  .resource-grid,
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .qa-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .stats-strip,
  .resource-grid,
  .feature-grid,
  .qa-grid {
    grid-template-columns: 1fr;
  }

  .hero-shell h1 {
    max-width: none;
  }

  .hero-actions {
    width: 100%;
  }

  .hero-actions .md-button {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .resource-card,
  .qa-card {
    transition: none;
  }
}