body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.landing {
  text-align: center;
  max-width: 960px;
  padding: 2rem;
}

.landing-headline {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0.5rem 0 0.75rem;
  color: var(--text);
}

.landing-tagline {
  color: var(--text-dim);
  font-size: 1rem;
  margin-bottom: 3rem;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.demo-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem 1.5rem;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.2s, transform 0.15s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}
.demo-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.demo-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  background: rgba(16,185,129,0.15);
}

.demo-title {
  font-size: 1.1rem;
  font-weight: 600;
}

.demo-desc {
  color: var(--text-dim);
  font-size: 0.85rem;
  line-height: 1.5;
}

@media (max-width: 820px) {
  .cards { grid-template-columns: 1fr; }
}