:root {
  color-scheme: dark;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  background: #050607;
  color: rgba(255, 255, 255, 0.9);
}

* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; }
body { background: #050607; }
.stage, #scene { position: fixed; inset: 0; width: 100%; height: 100%; }
#scene { display: block; }

.intro {
  position: fixed;
  left: clamp(24px, 5vw, 72px);
  top: clamp(28px, 8vh, 88px);
  width: min(480px, calc(100vw - 380px));
  pointer-events: none;
}

.eyebrow, .key-hint {
  margin: 0 0 14px;
  color: rgba(255,255,255,.42);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(58px, 10vw, 142px);
  font-weight: 400;
  letter-spacing: -.065em;
  line-height: .85;
}

.intro > p:not(.eyebrow) {
  max-width: 420px;
  margin: 28px 0 20px;
  color: rgba(255,255,255,.58);
  font-size: 15px;
  line-height: 1.55;
}

nav { display: flex; gap: 8px; pointer-events: auto; }
nav a {
  padding: 8px 11px;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 4px;
  color: rgba(255,255,255,.72);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .12em;
  text-decoration: none;
  text-transform: uppercase;
}
nav a:hover { color: #fff; border-color: rgba(255,255,255,.3); }

.key-hint { position: fixed; left: 22px; bottom: 18px; margin: 0; }
kbd {
  display: inline-grid;
  width: 22px;
  height: 22px;
  place-items: center;
  margin-right: 6px;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: 4px;
  font: inherit;
}

@media (max-width: 720px) {
  .intro { width: calc(100vw - 48px); }
  .intro > p:not(.eyebrow) { max-width: 62vw; }
  nav { flex-direction: column; align-items: flex-start; }
}