:root {
  --bg-top: #0b1020;
  --bg-bottom: #111827;
  --panel: #0f172a;
  --border: #334155;
  --text: #e5e7eb;
  --muted: #94a3b8;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  background:
    radial-gradient(circle at 20% 15%, #1f2937 0%, transparent 45%),
    radial-gradient(circle at 80% 85%, #111827 0%, transparent 45%),
    linear-gradient(160deg, var(--bg-top), var(--bg-bottom));
  color: var(--text);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.page {
  width: min(1100px, 100%);
  padding: 16px;
  text-align: center;
}

.page h1 {
  margin: 0 0 6px;
  font-size: clamp(1.15rem, 2.4vw, 1.8rem);
  letter-spacing: 0.3px;
}

.subtitle {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

#game-container {
  display: inline-block;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: linear-gradient(180deg, #0a1224, #0a0f1b);
  box-shadow:
    0 20px 45px rgba(0, 0, 0, 0.45),
    inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}

#game-container canvas {
  display: block;
  width: min(960px, 92vw);
  height: auto;
  border-radius: 10px;
  border: 2px solid #1f2937;
}