:root {
  --bg: #0b0f14;
  --card: #131a22;
  --text: #e6edf3;
  --muted: #9aa7b2;
  --accent: #7dd3fc;
  --accent-2: #22d3ee;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: linear-gradient(180deg, var(--bg), #0f1720);
  color: var(--text);
  min-height: 100vh;
  display: grid;
  place-items: center;
}
.container {
  width: 100%;
  max-width: 520px;
  padding: 24px;
}
.counter {
  background: linear-gradient(180deg, var(--card), #0f1620);
  border: 1px solid #1f2a37;
  border-radius: 16px;
  padding: 24px;
  display: grid;
  gap: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
}
#value {
  font-size: 64px;
  text-align: center;
  font-weight: 700;
}
button {
  padding: 12px 16px;
  font-size: 16px;
  color: var(--bg);
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
}
button.secondary {
  background: #1f2a37;
  color: var(--text);
}
button:active { transform: translateY(1px); }