:root {
    --bg: #101223;
    --text: #f1f5f9;
    --muted: #9aa3b8;
    --red: #ef4444;
    --blue: #3b82f6;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html, body {
    height: 100%;
    overflow: hidden;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    /* Disable pull-to-refresh, scroll bounce, and double-tap zoom on iOS */
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    overscroll-behavior: none;
  }
  body {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;  /* fallback */
    height: 100dvh; /* iOS Safari dynamic viewport */
  }
  #stage { position: relative; flex: 1; }
  canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
  #overlay {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    text-align: center;
    background: rgba(10, 12, 26, 0.8);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    padding: 24px;
    z-index: 5;
  }
  #overlay.hidden { display: none; }
  #overlay h1 {
    font-size: clamp(30px, 8vw, 52px);
    font-style: italic;
    font-weight: 800;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    background: linear-gradient(180deg, #fbbf24, #ef4444);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  #overlay .result { font-size: 30px; font-weight: 800; }
  #overlay p { color: var(--muted); font-size: 16px; line-height: 1.6; max-width: 34em; }
  #overlay .go { color: var(--text); font-weight: 600; animation: pulse 1.2s ease-in-out infinite; }
  #overlay a { color: var(--muted); text-decoration: none; font-size: 14px; margin-top: 8px; padding: 8px 14px; }
  @keyframes pulse { 50% { opacity: 0.45; } }
  #skin-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    max-width: 480px;
  }
  #skin-grid[hidden] { display: none; }
  #skin-grid button {
    padding: 10px 14px;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    background: #1c2033;
    color: var(--text);
    font: 700 13px -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    letter-spacing: 0.04em;
    cursor: pointer;
  }
  #skin-grid button:hover { background: #34405f; }
  #controls {
    display: none;
    gap: 10px;
    padding: 10px
             max(10px, env(safe-area-inset-right))
             max(10px, env(safe-area-inset-bottom))
             max(10px, env(safe-area-inset-left));
    background: #0a0c1a;
  }
  body.touch #controls { display: flex; }
  #controls button {
    flex: 1;
    height: 84px;
    border: 2px solid rgba(255, 255, 255, 0.14);
    border-radius: 16px;
    background: #1c2033;
    color: var(--text);
    font: 800 17px -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    letter-spacing: 0.06em;
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
  }
  #controls button.pressed { background: #34405f; transform: scale(0.96); }
  #controls #btn-block { flex: 0.9; background: #232b45; }