:root {
  color-scheme: light;
  --ink: #101828;
  --muted: #475467;
  --line: #d8e7ff;
  --blue: #2f7ef7;
  --cyan: #31c5c0;
  --paper: rgba(255,255,255,.92);
}
body.eft-kb-body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, rgba(47,126,247,.16), transparent 32rem),
    radial-gradient(circle at 82% 16%, rgba(49,197,192,.18), transparent 30rem),
    linear-gradient(115deg, #f7fbff, #fffaf4 55%, #f2fff9);
  line-height: 1.72;
}
.eft-kb {
  width: min(1080px, calc(100% - 40px));
  margin: 40px auto 72px;
}
a { color: #0758c8; text-decoration: underline; }
.hero, .card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: 0 24px 70px rgba(31, 70, 128, .11);
}
.hero {
  padding: clamp(28px, 5vw, 56px);
  border-inline-start: 6px solid var(--blue);
}
.eyebrow {
  display: inline-flex;
  gap: .5rem;
  align-items: center;
  padding: .25rem .75rem;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(47,126,247,.12), rgba(49,197,192,.14));
  color: #0f5ca8;
  font-weight: 800;
}
h1 {
  margin: 18px 0 10px;
  font-size: clamp(1.85rem, 3.8vw, 3rem);
  line-height: 1.16;
  letter-spacing: -.025em;
}
h2 {
  margin-top: 2.4rem;
  padding-top: 1.2rem;
  border-top: 1px solid rgba(16,24,40,.16);
}
.card > h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 24px;
}
.card {
  padding: 22px;
}
.meta {
  color: var(--muted);
  font-size: .96rem;
}
.chunk {
  margin: 18px 0;
  padding: 18px 20px;
  border-radius: 18px;
  background: linear-gradient(90deg, rgba(47,126,247,.08), rgba(49,197,192,.04));
  border-inline-start: 4px solid var(--cyan);
}
.chunk h3 {
  margin: 0 0 .45rem;
  font-size: 1.02rem;
}
.toc {
  columns: 2 320px;
  column-gap: 36px;
  padding-left: 1.2rem;
}
.toc li {
  break-inside: avoid;
  margin: .35rem 0;
}
code, pre {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
}
pre {
  white-space: pre-wrap;
  background: #f7faff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
}
footer {
  margin-top: 42px;
  color: var(--muted);
  font-size: .92rem;
}
.kb-nav {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem 1.2rem;
  align-items: center;
}
.kb-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2rem;
}
@media (max-width: 640px) {
  .eft-kb {
    width: min(100% - 24px, 1080px);
    margin: 24px auto 52px;
  }
  .hero {
    padding: 24px 20px;
    border-radius: 22px;
  }
  h1 {
    font-size: clamp(1.55rem, 8vw, 2.25rem);
  }
}