@media (max-width: 800px) {
  .site-header { overflow: visible; }
  .menu-toggle { flex: 0 0 38px; position: relative; z-index: 20; }
  .hero h1 { font-size: clamp(2.85rem, 11.5vw, 4.6rem); letter-spacing: -.07em; }
  .hero-visual { overflow: hidden; }
  .signal-card { right: 8px; }
}

@media (max-width: 430px) {
  .hero h1 { font-size: 11.5vw; }
}