:root {
  --bg: #0b0f14;
  --card: #131a22;
  --fg: #e6edf3;
  --muted: #8b98a5;
  --accent: #00ff88;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  display: grid;
  place-items: center;
  background: radial-gradient(1200px 600px at 50% -10%, #16202b 0%, var(--bg) 60%);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
}
.card {
  width: min(92vw, 360px);
  padding: 32px 28px;
  border-radius: 20px;
  background: var(--card);
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 20px 60px rgba(0,0,0,0.45);
  text-align: center;
}
.logo { display: block; margin: 0 auto 12px; }
h1 { margin: 0 0 8px; font-size: 20px; font-weight: 600; letter-spacing: 0.02em; }
.count {
  font-size: 88px;
  font-weight: 700;
  line-height: 1;
  margin: 16px 0 24px;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.controls { display: flex; gap: 12px; justify-content: center; }
button {
  width: 64px; height: 64px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.08);
  background: #1c2531;
  color: var(--fg);
  font-size: 32px;
  cursor: pointer;
  transition: transform 80ms ease, background 120ms ease;
}
button:hover { background: #24303e; }
button:active { transform: scale(0.94); }
#inc { background: var(--accent); color: #041b0f; border-color: transparent; }
#inc:hover { filter: brightness(1.08); }
.hint { margin: 20px 0 0; font-size: 12px; color: var(--muted); }