body {
  background: linear-gradient(120deg, #43cea2 0%, #185a9d 100%);
  font-family: 'Segoe UI', Arial, sans-serif;
  margin: 0;
  min-height: 100vh;
}
.container {
  max-width: 440px;
  margin: 40px auto;
  background: #eafaf1;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.10);
  padding: 24px 16px 32px 16px;
  text-align: center;
}
h1 {
  color: #185a9d;
  margin-bottom: 16px;
}
#solitaire-canvas {
  background: #fff;
  border: 2px solid #43cea2;
  border-radius: 8px;
  margin-bottom: 18px;
  touch-action: none;
  width: 100%;
  max-width: 420px;
  height: auto;
  display: block;
}
#restart-btn {
  background: #43cea2;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 28px;
  font-size: 1em;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
#restart-btn:hover {
  background: #185a9d;
  color: #fff;
}
@media (max-width: 500px) {
  .container { max-width: 98vw; padding: 8vw 2vw 10vw 2vw; }
  #solitaire-canvas { max-width: 98vw; }
}