:root {
  --bg-0: #05070a;
  --bg-1: #0d1219;
  --haze: rgba(140, 160, 180, 0.06);
  --ink: #cfd6dc;
  --dim: #6b7580;
  --life: #8affc1;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background:
    radial-gradient(120% 90% at 50% 20%, var(--haze), transparent 60%),
    radial-gradient(140% 100% at 50% 100%, rgba(20, 26, 34, 0.9), var(--bg-0) 70%),
    var(--bg-0);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  padding: 28px 32px 0;
}

.wordmark {
  font-size: 13px;
  letter-spacing: 0.32em;
  color: var(--dim);
  font-weight: 500;
}

.stage-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 18px;
  padding: 24px;
}

#stage {
  width: min(70vmin, 640px);
  height: min(70vmin, 640px);
  cursor: pointer;
  filter: drop-shadow(0 0 40px rgba(120, 160, 200, 0.05));
}

.caption {
  margin: 0;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--dim);
  transition: color 0.4s ease;
  user-select: none;
}

.caption.alive {
  color: var(--life);
}

.site-footer {
  padding: 20px 32px 28px;
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--dim);
}