* { box-sizing: border-box; }
body {
  margin: 0;
  background: #f0f2f5;
  color: #0f172a;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.65;
}
a { color: #4f46e5; text-decoration: none; }
a:hover { text-decoration: underline; }
.site {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 18px 64px;
}
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: #0f172a;
}
.logo-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
  display: grid;
  place-items: center;
  font-weight: 900;
}
.nav {
  display: flex;
  gap: 14px;
  font-size: 14px;
  font-weight: 650;
}
.hero, .article, .card {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 20px;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.06);
}
.hero { padding: 34px; margin-bottom: 24px; }
.hero h1, .article h1 {
  font-size: clamp(32px, 6vw, 54px);
  line-height: 1.02;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}
.hero p, .lede {
  color: #475569;
  font-size: 18px;
  margin: 0;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.card { padding: 22px; }
.card h2 { font-size: 20px; line-height: 1.2; margin: 0 0 8px; }
.card p { color: #64748b; margin: 0 0 16px; }
.tag {
  display: inline-block;
  color: #4338ca;
  background: #eef2ff;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 750;
}
.article { padding: 36px; }
.article h2 { margin-top: 34px; font-size: 26px; line-height: 1.2; }
.article h3 { margin-top: 24px; font-size: 19px; }
.article p, .article li { color: #334155; }
.article ul, .article ol { padding-left: 22px; }
.article figure {
  margin: 26px 0;
}
.article figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
}
.article figcaption {
  color: #64748b;
  font-size: 14px;
  margin-top: 10px;
}
.answer-box {
  padding: 18px;
  border-radius: 16px;
  background: #f8fafc;
  border: 1px solid rgba(148, 163, 184, 0.25);
  margin: 18px 0;
}
.answer-box p:last-child { margin-bottom: 0; }
.cta {
  margin: 30px 0;
  padding: 22px;
  border-radius: 16px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: white;
}
.cta p { color: rgba(255,255,255,0.9); margin: 0 0 14px; }
.cta a {
  display: inline-block;
  background: white;
  color: #4f46e5;
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 800;
}
.meta {
  color: #64748b;
  font-size: 14px;
  margin-bottom: 18px;
}
.footer {
  margin-top: 32px;
  color: #64748b;
  font-size: 14px;
}
@media (max-width: 640px) {
  .topbar { align-items: flex-start; flex-direction: column; }
  .hero, .article { padding: 24px; border-radius: 16px; }
}