* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #f4f7fb;
  background: #111827;
}

.game-shell {
  width: min(1100px, 100%);
  margin: 0 auto;
  padding: 24px;
}

.game-header {
  margin-bottom: 16px;
}

.game-header h1 {
  margin: 0 0 8px;
}

.game-header p {
  margin: 0;
  color: #aab4c3;
}

.game-stage {
  padding: 12px;
  border: 1px solid #334155;
  border-radius: 16px;
  background: #0f172a;
}

#gameCanvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  background: #1e293b;
}

.game-panel {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
}

button {
  border: 0;
  border-radius: 10px;
  padding: 10px 16px;
  color: #0f172a;
  background: #38bdf8;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  background: #7dd3fc;
}