/* CSS baseline */
:root {
  --bg: #0b0d12;
  --surface: #121621;
  --text: #e8ecf1;
  --muted: #a3adc2;
  --primary: #4f7cff;
  --primary-600: #3a66e6;
  --border: #263049;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body {
  height: 100%;
}
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
  color: var(--text);
  background: radial-gradient(1200px 600px at 10% -10%, #1b2240 10%, transparent 60%),
              radial-gradient(900px 600px at 110% 10%, #1a243d 10%, transparent 55%),
              var(--bg);
}

.container { width: 100%; margin: 0 auto; }

/* remove unused header/nav/typography spacing */
main { padding: 40px 0 64px; }

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  font-weight: 600;
  color: white;
  background: linear-gradient(180deg, var(--primary), var(--primary-600));
  border: none;
  border-radius: 12px;
  box-shadow: var(--shadow);
  cursor: pointer;
}
.button:hover { filter: brightness(1.05); }

.playfield {
  position: fixed;
  inset: 0; /* fullscreen */
  border: none;
  background: #0e1422;
  overflow: hidden;
}

.bouncy-box {
  position: absolute;
  width: 64px;
  height: 64px;
  background: #ff3b30; /* red */
  border-radius: 10px;
  box-shadow: var(--shadow);
  will-change: transform;
  display: grid;
  place-items: center;
  color: #ffffff;
  font-weight: 700;
  letter-spacing: 1px;
}

.site-footer { border-top: 1px solid var(--border); padding: 24px 0; background: #0f141f; }
.site-footer small { color: var(--muted); }

@media (max-width: 720px) {
  .site-header .container { flex-wrap: wrap; }
}