.opensource-hero {
  padding: 140px 0 60px;
  border-bottom: 1px solid var(--sm-border);
  position: relative;
  overflow: hidden;
}
.opensource-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 80% at 30% 45%, rgba(14, 116, 144, 0.1) 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 70% 55%, rgba(34, 211, 238, 0.08) 0%, transparent 70%);
  pointer-events: none;
}
.opensource-hero::after {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.25;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
  mix-blend-mode: overlay;
  pointer-events: none;
}
.opensource-hero h1 {
  font-family: var(--f-display);
  font-weight: 700;
  font-size: clamp(36px, 6vw, 64px);
  letter-spacing: -3px;
  line-height: 1;
  margin-bottom: 16px;
}
.opensource-hero-tagline {
  font-size: 16px;
  color: var(--sm-muted);
  line-height: 1.7;
}

.opensource-numbers,
.opensource-engines,
.opensource-protocols,
.opensource-infrastructure {
  padding: 80px 0;
  border-bottom: 1px solid var(--sm-border);
}
.opensource-cta {
  padding: 80px 0;
}

.opensource-numbers .numbers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.opensource-numbers .number-card {
  background: var(--sm-surface);
  border: 1px solid var(--sm-border);
  border-radius: 12px;
  padding: 32px 24px;
  text-align: center;
}
.opensource-numbers .number-value {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 42px;
  letter-spacing: -1px;
  margin-bottom: 8px;
}
.opensource-numbers .number-value[data-accent="teal"] { color: var(--sm-teal-glow); }
.opensource-numbers .number-value[data-accent="violet"] { color: var(--sm-violet-glow); }
.opensource-numbers .number-value[data-accent="gold"] { color: var(--sm-gold-glow); }
.opensource-numbers .number-label {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--sm-muted);
  letter-spacing: 0.5px;
}

.opensource-section-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

@media (max-width: 768px) {
  .opensource-hero { padding: 100px 0 40px; text-align: center; }
  .opensource-hero-tagline { margin: 0 auto; }
  .opensource-numbers,
  .opensource-engines,
  .opensource-protocols,
  .opensource-infrastructure { padding: 48px 0; }
  .opensource-numbers .numbers-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .opensource-numbers .number-value { font-size: 32px; }
  .opensource-section-grid { grid-template-columns: 1fr; }
}