:root {
    --bg-font: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
  
html,
body {
    height: 100%;
    margin: 0;
    font-family: var(--bg-font);
    background: linear-gradient(#87ceeb, #bfe6ff);
    color: #fff;
}
  
#gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
}
  
.ui {
    position: fixed;
    left: 20px;
    top: 20px;
    z-index: 10;
    color: #fff;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.6);
    display: flex;
    gap: 12px;
    align-items: center;
    user-select: none;
}
  
.panel {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(0, 0, 0, 0.08));
    padding: 10px 14px;
    border-radius: 10px;
    backdrop-filter: blur(6px);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
    font-size: 14px;
}
  
.score {
    font-weight: 700;
    font-size: 18px;
}
  
.meta {
    font-size: 12px;
    opacity: .9;
    margin-top: 4px;
}
  
.controls {
    position: fixed;
    right: 20px;
    top: 20px;
    z-index: 10;
    display: flex;
    gap: 10px;
}
  
button {
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.06);
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
}
  
button:active {
    transform: translateY(1px);
}
  
.centerMsg {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
    color: #fff;
    text-align: center;
    max-width: 420px;
    padding: 18px;
}
  
.centerMsg h1 {
    margin: 0 0 8px 0;
    font-size: 26px;
}
  
.centerMsg p {
    margin: 0 0 14px 0;
    color: rgba(255, 255, 255, 0.95);
    line-height: 1.35;
}
  
.tapHint {
    position: fixed;
    left: 50%;
    bottom: 30px;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.4);
    padding: 8px 12px;
    border-radius: 8px;
    color: #fff;
    z-index: 9;
    font-size: 13px;
}
  
/* smaller screens adjustments */
@media (max-width: 520px) {
    .controls {
      right: 12px;
      top: 12px;
      gap: 6px;
    }
  
    .panel {
      padding: 8px 10px;
    }
  
    .centerMsg {
      padding: 12px;
    }
}